2014年第45卷第4期共收錄54篇
1. Accession number: 20142117745292
Title: Fast recognition of multiple color targets of litchi image in field environment based on double otsu algorithm
Authors: Peng, Hongxing1, 2 ; Zou, Xiangjun1 ; Chen, Lijuan1; Xiong, Juntao1; Chen, Keyin1; Lin, Guichao1
Author affiliation: 1 Key Laboratory of Key Technology on South Agricultural Machine and Equipment, Ministry of Education, South China Agricultural University, Guangzhou 510642, China
2 College of Information, South China Agricultural University, Guangzhou 510642, China
Corresponding author: Zou, X. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 4
Issue date: 2014
Publication year: 2014
Pages: 61-68 75
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: An object in the field environment usually contains two or more classes of color targets. Fast recognition of color target image is the key technology for robot positioning and operation, which is widely used in the field of military, natural disaster rescue, agricultural harvesting robot, etc. However the speed of multi-target recognition in the field environment is usually slow, which makes the visual positioning precision of robots lower at present. This paper proposed a double Otsu segmentation method based on the improved Otsu algorithm for the recognition of multiple targets. To prove the effectiveness of this method, it was used on mature litchi recognition in the field environment. First of all, in order to improve the efficiency, the traditional Otsu algorithm was improved. Then the background, stem and fruit of the target color image were respectively recognized by using the improved Otsu algorithm. Compared with the K-means clustering (K-means) algorithm, the fuzzy C-mean clustering (FCM) algorithm, the Otsu and K-means algorithm, and the Otsu and FCM algorithm, the double Otsu segmentation algorithm was superior to the other four algorithms on the segmentation quality and correctness rate, the running time and stability. The test results showed that the recognition time for the mature litchi by using the double Otsu segmentation algorithm was less than 0.2 s. The effectiveness of the algorithm was verified through the experiment.
Number of references: 22
Main heading: Algorithms
Controlled terms: Color - Filter banks - Image segmentation - Military photography - Robots
Uncontrolled terms: Fuzzy c-mean clustering - K-means clustering - Litchi - Multiple targets - Segmentation algorithms
Classification code: 404.1 Military Engineering - 713 Electronic Circuits - 716 Telecommunication; Radar, Radio and Television - 723 Computer Software, Data Handling and Applications - 731.5 Robotics - 741.1 Light/Optics - 921 Mathematics
DOI: 10.6041/j.issn.1000-1298.2014.04.010
Database: Compendex
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2. Accession number: 20142117745334
Title: CFD visual analysis on cross section of truncated poppet valve
Authors: Zheng, Shujuan1, 2 ; Quan, Long1
Author affiliation: 1 Key Laboratory of Advanced Transducers and Intelligent Control Systems, Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China
2 College of Mechanical, North China University of Water Conservancy and Electric Power, Zhengzhou 450001, China
Corresponding author: Quan, L. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 4
Issue date: 2014
Publication year: 2014
Pages: 327-333
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: It exits large computational error that the computational formula derived from the untrucated poppet valve is adopted for the cross section area of the truncated popper valve. The flow pattern of the truncated poppet valve was studied with CFD visual algorithm. The position of cross section was confirmed based on the flow filed characteristics and the concept of the turn opening position was proposed. It was concluded that the cross section area of valve had a key turning point when the stroke of truncated poppet valve was large. The established technique and computational formula of the cross section was differed from the stroke and the converging/diverging flow. The result of the cross section area and the flow rate was more exactitude by adopting the new computational formula for the truncated poppet valve than by adopting the traditional formula. Comparing the flow filed characteristics of diverging flow with that of the converging flow, it was pointed out that the channel flow in the truncated poppet valve should consider the throttling pressure loss and the local pressure loss. It was summarized that the difference of the flow filed characteristics was induced by the local pressure loss.
Number of references: 20
Main heading: Computational fluid dynamics
Controlled terms: Flow visualization
Uncontrolled terms: Computational error - Computational formula - Converging flow - Cross section - Cross-section area - Local pressures - Poppet valve - Visual analysis
Classification code: 631 Fluid Flow
DOI: 10.6041/j.issn.1000-1298.2014.04.052
Database: Compendex
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3. Accession number: 20142117745314
Title: Enhanced technology of cattle manure compost by microbial inoculum with high lignocellulose degradation ability
Authors: Wang, Shunli1 ; Liu, Kefeng2 ; Li, Rongqi3; Wang, Jianzhong1; Jin, Zhulida4; Yang, Jianshan5
Author affiliation: 1 College of Biological Sciences and Technology, Beijing Forestry University, Beijing 100083, China
2 College of Urban and Rural Development, Beijing University of Agriculture, Beijing 102206, China
3 Beijing Created Biotechnology Co. Ltd., Beijing 100095, China
4 Dongyangfang Villag of Jiuxian Town, Yanqing County, Beijing 102109, China
5 Mosaic Fertilizers (Qinhuangdao)Co. Ltd., Qinhuangdao 066000, China
Corresponding author: Liu, K. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 4
Issue date: 2014
Publication year: 2014
Pages: 201-207
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Effect of independently developed microbial inoculum on cattle manure enhanced composting was studied, which was named CC-1 with high lignocellulose degradation ability. CC-1 was a mixture with Geotrichum candidum-BD1, Streptomyces thermocarboxydus-SM, Bacillus subtilis-KC and Coriolus versicolor, in which the first three kinds of microbial were selected from cattle manure in Beijing areas. The orthogonal composting test was conducted in simulated fermentation tanks to study the effects of different parameters such as C/N ratio(26, 28, 32), initial water content(55%, 60%, 65%), aeration rate (10 min, 20 min, 30 min ventilation every day, with 1.63 m3/min ventilation pump power), and inoculation amount of microbial agents on cattle manure composting. And composting effect was evaluated from temperature changes, C/N, sensory effect (including material particle size and stench) and total nutrients contents. The results showed that the optimum control parameters were as follows: C/N was 28, water content of compost materials was 55%, microbial inoculation amount was 0.8%(volume ratio) and 20 minutes ventilation every day (ventilation volume was 5.09 m3/(min·m3)). Then, with the optimum conditions, another composting was carried out to prove the effect of CC-1 on cattle manure composting, and the composting inoculated by EM and composting with non inoculum were taking as the controls. In this test, temperature changes and lignocellulose degradation during composting were measured. Besides, pH value, GI (germination index), TC, TN, TP, TK, and humic acid were determined when composting finished. The results showed that the composting period was shortened. The period of temperature rising to 50°Cwas 2 or 3 days earlier and the period of temperature decreasing to 40°C below was 8 days earlier, compared to that inoculated by EM and non-inoculated. When composting finished, pH value and GI of compost inoculated by CC-1 were 7.9 and 106.5%. Compared to compost that inoculated by EM and non-inoculated, the TN was 19.33% and 27.35% higher, total nutrient was 7.91% and 23.95% higher, and the humic acid was 16.38% and 47.53% higher in compost that inoculated by CC-1. Degradation ratios of hemi-cellulose and cellulose in compost inoculated by CC-1 was 1.2 and 1.8 times, and 1.8 and 2.1 times that in compost inoculated by EM and non-inoculated, respectively.
Number of references: 18
Main heading: Composting
Controlled terms: Biological materials - Cellulose - Fermentation - Lignin - Manures - Nutrients - Organic acids - pH - Ventilation
Uncontrolled terms: Aerobic fermentation - Cattle mature - Compost technologies - Inoculum - Lignocellulose
Classification code: 452 Municipal and Industrial Wastes; Waste Treatment and Disposal - 452.3 Industrial Wastes - 461 Bioengineering and Biology - 643.5 Ventilation - 801.1 Chemistry, General - 801.2 Biochemistry - 804.1 Organic Compounds - 815.1.1 Organic Polymers
DOI: 10.6041/j.issn.1000-1298.2014.04.032
Database: Compendex
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4. Accession number: 20142117745328
Title: Image wavelet transform on low memory sensor nodes of WMSN
Authors: Lu, Mingzhou1 ; Liu, Zhiqiang1; Shen, Mingxia1 ; Liu, Longshen1; Yang, Xiaojing2; Zhou, Bo3
Author affiliation: 1 Jiangsu Province Engineering Lab. for Modern Facility Agriculture Technology and Equipment, Nanjing Agricultural University, Nanjing 210031, China
2 Key Laboratory of Animal Physiology and Biochemistry, Ministry of Agriculture, Nanjing Agricultural University, Nanjing 210095, China
3 College of Animal Science and Technology, Nanjing Agricultural University, Nanjing 210095, China
Corresponding author: Shen, M. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 4
Issue date: 2014
Publication year: 2014
Pages: 289-293 188
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: This paper adopts a line based wavelet transform method with the Le Gall 5/3 filter, in which the image lines are read to SRAM line by line from the SD card and write to the SD card after the multi-level transform operation. The wavelet transform method requires low SRAM memory and involves fixed point integer multiplication, addition, shift operation only. Appling the method to a 256 pixels ×256 pixels gray image of piglets. experimental results show that the SRAM cost of the method is 3.968 KB and the time cost is 8.718 s with a reasonable cost of the arithmetic operation. This study establishes the foundation for the wavelet transform image compression on the image sensor nodes, and makes it possible to transmit the images of agriculture over the low bandwidth WMSN efficiently.
Number of references: 15
Main heading: Static random access storage
Controlled terms: Image compression - Pixels - Sensor networks - Sensor nodes - Wavelet transforms
Uncontrolled terms: Arithmetic operations - Fixed-point integer - Image lines - Le Gall 5/3 filter - Low memory - Low-bandwidth - Multimedia sensor networks - Shift operations
Classification code: 722 Computer Systems and Equipment - 732 Control Devices - 741 Light, Optics and Optical Devices - 921.3 Mathematical Transformations
DOI: 10.6041/j.issn.1000-1298.2014.04.046
Database: Compendex
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5. Accession number: 20142117745336
Title: Uniformity of double stator alien slider hydraulic motor
Authors: Wen, Desheng1 ; Zhang, Kaiming1; Zhang, Sanxi1; Zheng, Zhenquan1; Yang, Jie1
Author affiliation: 1 Hebei Provincial Key Laboratory of Heavy Machinery Fluid Power Transmission and Control, Yanshan University, Qinhuangdao 066004, China
Corresponding author: Wen, D. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 4
Issue date: 2014
Publication year: 2014
Pages: 341-346
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: To meet the needs of different working conditions, a double-stator multi-motors was designed. Double-stator single-acting multi-motors was one of double-stator multi-motors. In order to realize the performance of motor, the influence of torque pulsation by different number of slider was studied based on the analysis of the theoretical displacement and theoretical torque of double-stator single-acting multi-motors. Through the analysis, mathematical expressions of the motor torque and the number of sliders were obtained. Meanwhile, the results show that the lag angle can influence torque pulsation when outer motor and inner motor work at the same time and differential connection. It turns out that the uniformity of angular velocity is smaller when the number of alien slider is odd, while the amplitude of angular velocity is a little larger than the motor whose number of sliders is even. This research work lays a theoretical foundation for the design of double-stator single-acting multi-motors.
Number of references: 20
Main heading: Torque motors
Controlled terms: Angular velocity - Hydraulic motors - Stators - Torque
Uncontrolled terms: Angular speed - Differential connection - Double stator - Mathematical expressions - Slider - Theoretical foundations - Torque pulsation - Uniformity
Classification code: 421 Strength of Building Materials; Mechanical Properties - 632.2 Hydraulic Equipment and Machinery - 705.1 Electric Machinery, General - 705.3 Electric Motors - 931.1 Mechanics
DOI: 10.6041/j.issn.1000-1298.2014.04.054
Database: Compendex
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6. Accession number: 20142117745310
Title: Scale-dependency of spatial variability of soil air permeability on typical oasis croplands at middle reaches of Heihe river
Authors: Wang, Weihua1 ; Wang, Quanjiu2, 3
Author affiliation: 1 Faculty of Modern Agricultural Engineering, Kunming University of Science and Technology, Kunming 650500, China
2 The Institute of Water Resources and Hydroelectric Engineering, Xi'an University of Technology, Xi'an 710048, China
3 State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences, Yangling, Shaanxi 712100, China
Corresponding author: Wang, Q. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 4
Issue date: 2014
Publication year: 2014
Pages: 179-183
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: This article attempts to analyze the impacts of sampling extent and sampling spacing on soil air permeability's spatial variability, and preliminary discuss the scale-dependency. The spatial variation of parameters in Linze County, an agricultural area in the middle reaches of Heihe River Basin, was examined. A study in a 21 m ×21 m of wheat zone was carried out, and the spatial variation of soil air permeability was analyzed with all the data measured under 3 m×3 m sampling grid. Then, re-sampling technique was employed with including coefficient of variation, correlation length and Moran's I index were applied to each scenario to characterize the degree of spatial variability of soil air permeability. The results showed that all measured indices increased with various degrees with increasing extent. However, the spacing did not affect coefficient of variation and Moran's I index, while correlation length decreased with the increase of the spacing.
Number of references: 22
Main heading: Air permeability
Controlled terms: Soils
Uncontrolled terms: Agricultural areas - Coefficient of variation - Correlation lengths - Heihe river basin - Scale - Soil air permeabilities - Spatial variability - Spatial variations
Classification code: 483.1 Soils and Soil Mechanics - 819.5 Textile Products and Processing
DOI: 10.6041/j.issn.1000-1298.2014.04.028
Database: Compendex
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7. Accession number: 20142117745306
Title: Dynamic and hydraulic characteristics of centrifugal water motor for single-span center pivot irrigation system
Authors: Yu, Pengfei1 ; Jin, Hongzhi1; Yan, Haijun2 ; Hou, Yongsheng1; Gao, Jiangyong1; Yang, Xiaogang1
Author affiliation: 1 Chinese Academy of Agricultural Mechanization Sciences, Beijing 100083, China
2 College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, China
Corresponding author: Yan, H. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 4
Issue date: 2014
Publication year: 2014
Pages: 152-156 116
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to meet the reqirements of sprinkler irrigation uniformity and tower travelling capacity of a single-span center pivot irrigation system, the dynamics and hydraulic characteristics of the centrifugal water motor with a lower injector port were investigated. Relevant formulas were established for computing driving torque, speed and operating flow rate. The key factors affecting the driving torque and rotation speed of centrifugal water motor were analyzed. The results showed that the irrigated water depth could be adjusted more effectively by changing the working pressure of the water motor to control the rotation speed than by increasing the diameter of sprinkler nozzle to increase the work flow of water motor or by extending the length of the rotating arm. It is necessary to consider the structural and hydraulic designs of centrifugal water motor, travelling capacity and sprinkler irrigation uniformity of center pivot irrigation system simultaneously and optimize their combinations. In this way the demands of system traveling capacity and agricultural irrigation uniformity could be met at the same time.
Number of references: 15
Main heading: Torque motors
Controlled terms: Buoyancy - Centrifugation - Sprinkler systems (irrigation)
Uncontrolled terms: Agricultural irrigation - Center pivot irrigation systems - Driving torques - Hydraulic characteristic - Hydraulic designs - Hydraulic performance - Sprinkler irrigation - Working pressures
Classification code: 631 Fluid Flow - 705.3 Electric Motors - 802.3 Chemical Operations - 821.1 Agricultural Machinery and Equipment
DOI: 10.6041/j.issn.1000-1298.2014.04.024
Database: Compendex
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8. Accession number: 20142117745307
Title: Design of self-locking gripper for tea stalks
Authors: He, Xuejun1 ; Wang, Jin1 ; Lu, Guodong1; Tang, Xiaolin2
Author affiliation: 1 State Key Laboratory of Fluid Power Transmission and Control, Zhejiang University, Hangzhou 310027, China
2 Hangzhou Tea Research Institute, China CO-OP, Hangzhou 310016, China
Corresponding author: Wang, J. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 4
Issue date: 2014
Publication year: 2014
Pages: 157-162
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to realize column clamping of fresh tea in tea leaf and stalk separation, a self-locking gripper consisted of slider-crank mechanism and RRR assur group was designed. Analysis showed that, retraction phenomenon might happen if parameters were not suitably selected, which make it difficult to grip small diameter objects. However, it could be avoided by the constraining of retraction height. Secondly, relations between parameters were deduced, based on which an appropriate method was proposed on the determination of design parameters. The design problem was attributed to a transcendental equation, which was solved by particle swarm optimization method. Experimental results showed that grippers designed with this method can realize clamping and self-locking successfully, and a clamping length of 5~15 mm was suitable.
Number of references: 17
Main heading: Design
Controlled terms: Grippers - Locks (fasteners)
Uncontrolled terms: Clamping lengths - Design parameters - Design problems - Particle swarm optimization method - Selflocking - Slider-crank mechanism - Tea stalk - Transcendental equations
Classification code: 408 Structural Design - 601.3 Mechanisms - 731.5 Robotics
DOI: 10.6041/j.issn.1000-1298.2014.04.025
Database: Compendex
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9. Accession number: 20142117745330
Title: Quickly construction of quartic λ-Bézier rotation surfaces with shape parameters
Authors: Hu, Gang1, 2 ; Ji, Xiaomin1 ; Qin, Xinqiang2
Author affiliation: 1 School of Mechanical and Precision Instrument Engineering, Xi'an University of Technology, Xi'an 710048, China
2 School of Science, Xi'an University of Technology, Xi'an 710054, China
Corresponding author: Ji, X. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 4
Issue date: 2014
Publication year: 2014
Pages: 304-309
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: A method for constructing rotation surfaces with local shape parameters was proposed to solve the problems in adjusting and controlling shapes of rotation surfaces. Based on the transfinite vectored rational interpolating function, the quartic λ-Be?zier rotation surfaces with multiple shape parameters were constructed using a quartic λ-Be?zier curve. Then, the explicit function expression of the quartic λ-Be?zier rotation surfaces was presented. The proposed quartic λ-Be?zier rotation surfaces inherited the outstanding properties of the Be?zier rotation surfaces, and had a good performance on adjusting their local shapes by changing the value of shape parameters. Finally, some properties of the quartic λ-Be?zier rotation surfaces and applications in rotation surfaces design were discussed. The modeling examples showed that the proposed method was simple and effective, and easy to control the shape of rotation surfaces, which provided a valuable way for the design of rotation surfaces.
Number of references: 20
Main heading: Rotation
Controlled terms: Interpolation - Rational functions
Uncontrolled terms: Interpolating functions - Local shape - Local shape parameter - Shape parameters
Classification code: 601.1 Mechanical Devices - 921 Mathematics - 921.6 Numerical Methods
DOI: 10.6041/j.issn.1000-1298.2014.04.048
Database: Compendex
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10. Accession number: 20142117745311
Title: Optimal model of dual-layer water-saving irrigation on urban green land
Authors: Zhao, Yandong1 ; Liu, Shengbo1; Tao, Xin2; Lai, Xiaolong1; Cai, Xiang3
Author affiliation: 1 School of Technology, Beijing Forestry University, Beijing 100083, China
2 MENOBLE Co. Ltd., Beijing 100083, China
3 College of Information and Electrical Engineering, China Agricultural University, Beijing 100083, China
Corresponding author: Zhao, Y. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 4
Issue date: 2014
Publication year: 2014
Pages: 184-188
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Precise irrigation of agro forestry is imminent with the shortage of water resources in the world and the development of modern agro forestry and information science. One of the effective means to realize precise irrigation is to improve the control method and control accuracy. In order to study the effective control strategy for the irrigation of urban green land, an irrigation control model with optimal control theory was built. To testify the model, a dual-layer sensor was used to obtain the soil moisture in depth of two layers (20 cm and 40 cm) simultaneously. The experiment was conducted in an urban green land of Beijing. With the same climatic environment, the traditional irrigation control model with Bang-Bang control method and the optimal irrigation control model were compared. After comparative study in two months of 2011, the experiment result indicated that, comparing with Bang-Bang control, the optimal control saved water remarkably (approx. 25%) in the same weather, soil and grass management conditions and ensured the lawn grass meeting the landscape requirements.
Number of references: 20
Main heading: Irrigation
Controlled terms: Bang bang control systems - Experiments - Forestry - Intelligent control - Soil moisture - Timber - Water resources
Uncontrolled terms: Bang-Bang control - Comparative studies - Irrigation controls - Optimal control theory - Optimal controls - Traditional irrigation - Urban green lands - Water-saving irrigation
Classification code: 415.3 Wood Structural Materials - 444 Water Resources - 483.1 Soils and Soil Mechanics - 731.1 Control Systems - 821.0 Woodlands and Forestry - 821.3 Agricultural Methods - 901.3 Engineering Research
DOI: 10.6041/j.issn.1000-1298.2014.04.029
Database: Compendex
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11. Accession number: 20142117745293
Title: Iterative threshold segmentation of apple branch images based on CLAHE
Authors: Ji, Wei1 ; Tao, Yun1; Zhao, Dean1; Yang, Jun2; Ding, Shihong3
Author affiliation: 1 School of Electrical and Information Engineering, Jiangsu University, Zhenjiang 212013, China
2 Key Laboratory of Measurement and Control of Complex Systems of Engineering, Ministry of Education, Southeast University, Nanjing 210096, China
3 Key Lab. of Facility Agriculture Measurement and Contl. Technol. and Equipment of Machinery Industry, Jiangsu University, Zhenjiang 212013, China
Corresponding author: Ji, W. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 4
Issue date: 2014
Publication year: 2014
Pages: 69-75
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: For automatically navigating and identifying branches obstacle in the picking process of agricultural harvesting robots, it is necessary to solve the defection of iterative threshold segmentation since the gray scale difference between target and background is not clear. The iterative threshold segmentation of apple branch images based on contrast limited adaptive histogram equalization (CLAHE) was proposed. Firstly, the RGB color space of the apple branch images were transformed to the XYZ and I1I2I3 color space by transformation, and the X-Y color difference factors and I2 color factor of the apple branch images were extracted to analyze their gray level difference. Then the CLAHE was applied to the image in which the gray level difference was not obvious before iterative threshold. Finally, the apple branch images were segmented from the original images. Results showed that the ratio of successful segmentation was 92%.
Number of references: 17
Main heading: Image segmentation
Controlled terms: Color - Fruits - Graphic methods
Uncontrolled terms: Adaptive histogram equalization - Agricultural harvesting - Branch images - Color space - Contrast Limited Adaptive Histogram Equalization (CLAHE) - Gray level differences - Iterative threshold - Target and background
Classification code: 741.1 Light/Optics - 821.4 Agricultural Products - 902.1 Engineering Graphics
DOI: 10.6041/j.issn.1000-1298.2014.04.011
Database: Compendex
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12. Accession number: 20142117745326
Title: Evaluation of pearl quality based on monocular multi-view machine vision
Authors: Tang, Yiping1 ; Xia, Shaojie1; Li, Chenrong1; Zhu, Zhiliang1; Chen, Xinfeng1; Feng, Yijun1
Author affiliation: 1 College of Information Engineering, Zhejiang University of Technology, Hangzhou 310023, China
Corresponding author: Tang, Y. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 4
Issue date: 2014
Publication year: 2014
Pages: 276-283
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to evaluate pearl color and luster, a monocular multi-view imaging device was designed by placing a HD camera in front of a symmetric bucket cavity body which constituted by the multiple pieces of plane mirror. The device could achieve the pearl's surface images taken from five different perspectives. Then image processing was used to fuse the five pearl images and achieve a new image which contained the pearl's whole surface. After that, a pearl's region was divided into highlight areas and bright area, then the characteristic parameter of color was picked-up from bright area and the characteristic parameter of luster from highlight area. Finally, the feature fusion was used to determine the quality of the pearl. The experimental results showed that the monocular multi-view machine vision device could obtain the entire surface of the pearl in the same color system, and accomplish the real-time detection and grading for pearl's color, luster and uniformity.
Number of references: 15
Main heading: Gems
Controlled terms: Color - Computer vision - Grading - Image fusion - Quality control
Uncontrolled terms: Cavity bodies - Color systems - Feature fusion - Multi-view imaging - Multi-views - Pearl - Quality detection - Real-time detection
Classification code: 482.2.1 Gems - 723.2 Data Processing and Image Processing - 723.5 Computer Applications - 741.1 Light/Optics - 741.2 Vision - 913.3 Quality Assurance and Control
DOI: 10.6041/j.issn.1000-1298.2014.04.044
Database: Compendex
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13. Accession number: 20142117745332
Title: 3-D CAD model retrieval algorithm based on distance and angle distributions
Authors: Zhang, Kaixing1 ; Huang, Rui2; Liu, Xianxi3
Author affiliation: 1 College of Mechanical and Electronic Engineering, Shandong Agricultural University, Taian 271018, China
2 School of Mechanical Engineering, Northwestern Polytechnical University, Xi'an 710072, China
3 Shandong Provincial Key Laboratory of Horticultural Machineries and Equipments, Shandong Agricultural University, Taian 271018, China
Corresponding author: Liu, X. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 4
Issue date: 2014
Publication year: 2014
Pages: 316-321
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: To reuse 3-D CAD models more efficiently, a 3-D CAD model retrieval algorithm based on distance and angle distributions was proposed. Firstly, a large number of random points on the model surface were taken to calculate the length of the directed line constructed between two random points and the angle between the normal of the point and the directed line. Then, a distance-angle planar grid was constructed to express the distance-angle distribution by obtaining a statistic data of the sampled points. At last, the Manhattan distance metric method was used to compute the similarity between the two distance-angle matrices, which can give the similarity coefficient for two compared 3-D CAD models. Experiments results show that the algorithm can effectively support 3-D CAD model retrieval, and the efficiency meets the requirements of engineering application.
Number of references: 15
Main heading: Three dimensional
Controlled terms: Algorithms - Computer aided design - Three dimensional computer graphics
Uncontrolled terms: 3-d modeling - Angle distribution - Distance-angle distributions - Engineering applications - Manhattan distance - Reusable - Shape distribution - Similarity coefficients
Classification code: 723 Computer Software, Data Handling and Applications - 723.5 Computer Applications - 921 Mathematics
DOI: 10.6041/j.issn.1000-1298.2014.04.050
Database: Compendex
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14. Accession number: 20142117745302
Title: Multi-line metering device with ring groove push movement
Authors: Cao, Chengmao1 ; Wang, Anmin1; Qin, Kuan1; Sun, Yan1; Zhou, Min1
Author affiliation: 1 College of Engineering, Anhui Agricultural University, Hefei 230036, China
Corresponding author: Cao, C. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 4
Issue date: 2014
Publication year: 2014
Pages: 128-134
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: A multi-line metering device was designed for drill seeding of wheat and rice with ring groove push movement. Working principle of the multi-line metering device and force on dropping seed were analyzed, and the theoretical maximum speed of the metering plate was investigated. The Yannong-19 wheat was taken as the testing object, and the relationship among several parameters was studied, which were rotation speed with single-line delivery capacity, coefficient of variation of single-line flow rate, coefficient of variation of flow rate among all lines, coefficient of variation of total flow rate and damage rate through the captive test of seeding device. The experimental results showed that a linear increase was observed with increasing rotation speed. Coefficient of variation of single-line flow rate, flow rate among all lines and total flow rate firstly increased and then descended with increasing rotation speed, and the lowest coefficient of variation (28.5%, 1.33% and 0.51%) were observed at 2.5 r/min rotation speed. The damage rate increased with the increasing rotation speed, and increased obviously when rotation speed was higher than 2.5 r/min.
Number of references: 26
Main heading: Flow rate
Controlled terms: Drills
Uncontrolled terms: Captive tests - Coefficient of variation - Delivery capacity - Metering devices - One-machine-multi-line - Ring grooves - Rotation speed - Seed-metering device
Classification code: 603.2 Machine Tool Accessories - 631 Fluid Flow
DOI: 10.6041/j.issn.1000-1298.2014.04.020
Database: Compendex
|
15. Accession number: 20142117745331
Title: Class II synthesis of constant-breadth cam mechanism with floating flat faced pushrod
Authors: Chang, Yong1, 2 ; Lin, Rongfu1; Li, Yanping1
Author affiliation: 1 School of Mechanical Engineering, Jimei University, Xiamen 361021, China
2 Engineering Training Center, Jimei University, Xiamen 361021, China
Corresponding author: Li, Y. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 4
Issue date: 2014
Publication year: 2014
Pages: 310-315
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: This paper took the constant-breadth cam mechanism with floating flat faced pushrod as research object. The concepts of rise and return travel, radius-making line, and width mapping interval set were introduced. The intrinsic regularity relationship of the angles of rise/return and farthest/nearest dwell angle, and the characteristic relationship of kinematic sizes, amplitude of rise travel, and the beginning parameters were discussed in detail. Then, the displacement function of the rocker was solved. The selected interval of the flat and the range of base circle radius, pressure angle, and width were presented. They reveal that the design of this mechanism contained a special, complex and profound content. The comparison of constant-breadth cam and conjugate cam were presented, which deepen the understanding of similarities and differences of the two kinds of shape lock mechanism. A mechanism synthesis example of this mechanism was displaced.
Number of references: 21
Main heading: Cams
Uncontrolled terms: Cam mechanism - Floating flat faced pushrod - Optimal solutions - Radius-making line - Width mapping interval
Classification code: 601.3 Mechanisms
DOI: 10.6041/j.issn.1000-1298.2014.04.049
Database: Compendex
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16. Accession number: 20142117745312
Title: Spatial and temporal variation of three irrigation water productivity indexes in China
Authors: Cao, Xinchun1, 2 ; Wu, Pute1, 2 ; Wang, Yubao1, 2; Zhao, Xining2; Wang, Zikui1; Tian, Lei2
Author affiliation: 1 College of Water Resources and Architectural Engineering, Northwest A and F University, Yangling, Shaanxi 712100, China
2 Institute of Water Saving Agriculture in Arid Regions of China, Yangling, Shaanxi 712100, China
Corresponding author: Wu, P. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 4
Issue date: 2014
Publication year: 2014
Pages: 189-194
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Three indexes, gross irrigation water productivity (Pg), canal irrigation water productivity (Pc), and net irrigation water productivity (Pn), were built. The data from 443 major irrigation areas throughout China were collected in 1998, 2005 and 2010, and the spatial and temporal variation of irrigation water production and the relationship between the indexes were analyzed. The results showed that the national average value of the three indexes were 1.361, 2.532 and 2.989 kg/m3. and the indexes in each province showed a trend of increasing with time. The municipalities directly under the central government increased large while grain producing areas in Yangtze River Basin were small. The irrigation water productivity indexes in representative years aggregated obviously in the area of Huang-Huai-Hai plain as a high value area while the low value areas were in south, northwest and northeast of China. There were significant linear correlations among Pg, Pc and Pn, respectively. The determination coefficients were greater than 0.90.Any index can be used as the representative of regional irrigation water productivity in the country.
Number of references: 20
Main heading: Water resources
Controlled terms: Irrigation - Water
Uncontrolled terms: Central government - Determination coefficients - Index - Irrigation waters - Linear correlation - Spatial and temporal variation - Water productivity - Yangtze River basin
Classification code: 444 Water Resources - 821.3 Agricultural Methods
DOI: 10.6041/j.issn.1000-1298.2014.04.030
Database: Compendex
|
17. Accession number: 20142117745301
Title: Seedling pick-up mechanism of planetary gear train with two-order general non-circular gears
Authors: Zhao, Xiong1, 2 ; Chen, Jianneng1 ; Yang, Maoxiang1; Zhao, Yun1
Author affiliation: 1 College of Machinery and Automation, Zhejiang Sci.-Tech. University, Hangzhou 310018, China
2 The Key Laboratory of Zhejiang Transplanting Equipment Technology, Hangzhou 310018, China
Corresponding author: Chen, J. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 4
Issue date: 2014
Publication year: 2014
Pages: 123-127
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to meet the requirements of dryland pot seeding transplanting mechanism, which need to achieve ideal "olecranon shaped" track, a continuous transmission seedling pick-up mechanism of planetary gear train with second-order general non-circular gears was proposed so as to achieve the seedlings claw periodic secondary unequal amplitude swing. The curve fitting method was utilized to build free transmission function, and a mathematical model about non-constant velocity drive of mechanisms was established, The mechanism analysis software was compiled, and the transmission ratio functions and mechanism parameters were determined to manufacture the seedlings transplanting mechanism. The high speed video test was carried out, The results showed that the seedlings test trajectory could agree well with theoretical calculations. The depth of taking seedlings was deeper than 35 mm, and the scoop of pot was less than 5mm. The posture of seedlings claw met the job requirements during plunging into pot and quitting pot process.
Number of references: 15
Main heading: Gears
Controlled terms: Curve fitting - Mathematical models - Pickups
Uncontrolled terms: Curve fitting methods - Non-circular gears - Non-constant velocities - Planetary gear train - Seedling transplanter - Seedlings transplanting - Theoretical calculations - Transplanting mechanisms
Classification code: 601.2 Machine Components - 752.3.1 Sound Reproduction Equipment - 921 Mathematics
DOI: 10.6041/j.issn.1000-1298.2014.04.019
Database: Compendex
|
18. Accession number: 20142117745285
Title: Gearshift control for AMT based on a 2-DOF electromagnetic actuator
Authors: Lin, Shusen1 ; Chang, Siqin1; Li, Bo1
Author affiliation: 1 School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
Corresponding author: Lin, S. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 4
Issue date: 2014
Publication year: 2014
Pages: 14-21
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: To improve the shifting quality of the automated manual transmission (AMT), a type of AMT gearshift system based on a 2-DOF electromagnetic actuator was developed. A coupling system model including electric, magnetic circuit and mechanics was built. The characteristics were investigated through tests. The output force was more than 1 200 N and the maximum output torque was 2.5 N·m, which showed that the dynamic response was relatively fast. The gearshift process was divided into four phases. During the synchronization process, an optimal objective function of shift quality indexes was developed and the optimal control was adopted to achieve the optimal shift quality. The shift sequence coordinated control of shift out and gear selection was introduced, and the gearshift controller was designed and tested. When the equivalent inertia was 0.03 kg·m2 and the speed difference was 620 r/min, the results showed that the shift time was 135 ms, the impact was 3.86 m/s3, and the friction work per unit was 0.077 J/mm2. The coordinated control method could be reduced to 11 ms. The test results indicated that, combined with the designed control strategy, the novel gearshift system achieved good shift performance.
Number of references: 20
Main heading: Electromagnets
Controlled terms: Control - Dynamic response - Electric actuators - Optimization - Speed control
Uncontrolled terms: Automated manual transmission - Co-ordinated control - Control strategies - Electromagnetic actuators - Gearshift control - Objective functions - Optimal controls - Synchronization process
Classification code: 408.1 Structural Design, General - 704.1 Electric Components - 731 Automatic Control Principles and Applications - 731.3 Specific Variables Control - 732 Control Devices - 732.1 Control Equipment - 921.5 Optimization Techniques
DOI: 10.6041/j.issn.1000-1298.2014.04.003
Database: Compendex
|
19. Accession number: 20142117745297
Title: Flow field simulation and seeding experiment on suction nozzle of cupule-type rice seeder
Authors: Wang, Yongwei1 ; Cao, Lin1; Wang, Jun1 ; Cheng, Shaoming1; Wang, Jian2
Author affiliation: 1 School of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310058, China
2 Wenzhou Municipal Commission of Development and Reform, Wenzhou 325009, China
Corresponding author: Wang, J. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 4
Issue date: 2014
Publication year: 2014
Pages: 96-102
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to analyze the influence of flow field distribution of cupule-type rice seeder on seeding performance, a 2BZQZ-300 seeder was investigated with Fluent software. Models of different nozzle diameters were built and both horizontal and vertical seed were considered in seed suction model. Then, planting experiment was conducted to confirm seed uniformity. The results showed that, the static pressure was well-distributed whether above the nozzle or below it, and there was no significant coupling effect of airflow to adjacent nozzles. And when the considered seed was picked up, most airflow appeared at the area between nozzle and seed. The effective stress area of seed surface increased linearly with the increase of nozzle diameter. The negative pressure in the effective stress areas obviously rised with the aperture increasing during horizontal suction, while there were no obvious varieties during vertical suction. Therefore, the seed surface stress in horizontal suction was significantly higher than that of vertical adsorption, which would be helpful for improving the adsorption rate and the stability of seed carrying. The pickup performance was enhanced when diameter of nozzle increased. Because of the coupling effect of seed and airflow, the surface thrust of a horizontal seed was obviously larger than a vertical one, therefore a horizontal seed was much easier to suck up and more stable to carry. As the test showed, seeds were well distributed in trays, and total uniform coefficient reached 94.9%.
Number of references: 21
Main heading: Seed
Controlled terms: Adsorption - Computer simulation - Experiments - Nozzles - Pickups
Uncontrolled terms: Adsorption rates - Effective stress - Flow field distribution - Flow field simulation - Negative pressures - Planting experiments - Rice seeder - Seeding performance
Classification code: 631.1 Fluid Flow, General - 723.5 Computer Applications - 752.3.1 Sound Reproduction Equipment - 802.3 Chemical Operations - 821.4 Agricultural Products - 901.3 Engineering Research
DOI: 10.6041/j.issn.1000-1298.2014.04.015
Database: Compendex
|
20. Accession number: 20142117745303
Title: Reduction of soil adhesion and traction resistance of ridged bionic press rollers
Authors: Tong, Jin1 ; Zhang, Qingzhu1; Chang, Yuan1; Chen, Donghui1; Dong, Wenhua1; Zhang, Leilei1
Author affiliation: 1 Key Laboratory of Bionic Engineering, Ministry of Education, Jilin University, Changchun 130025, China
Corresponding author: Tong, J. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 4
Issue date: 2014
Publication year: 2014
Pages: 135-140
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: The phenomenon of soil adhesion occurred widely when conventional press roller worked. To solve the problem, nine biomimetic press rollers with bionically ridged structures were designed learning from the geometric structure of the ventral surface of dung beetle (Copris ochus Motschulsky). Bionically ridged structures using ultra high molecular weight polyethylene material, which possessed good hydrophobic properties, were modeled on the surfaces of press rollers. Orthogonal tests of L9(34) were performed in an indoor soil bin with a moisture content (dry basis) of 20%. The effects of the bottom width of ridge section (W), ridge height to width ratio (R), roller loads (F) and the area ratio (K) on soil adhesion and traction resistance were determined. The results showed that under the identical conditions, all bionic rollers exhibited lower adhesion than a conventional roller against soil in a suitable compaction for corn, and the maximal adhesion reduction rate was 41.08%. The bionic roller with ridged structure with reasonable dimensions could reduce the traction force by 11.75%~39.40% than conventional roller. The order and optimal levels of the experiment factors influencing soil adhesion and resistance were determined by range method. The impact of the different factors on the soil adhesion and resistance of press roller was discussed.
Number of references: 27
Main heading: Presses (machine tools)
Controlled terms: Adhesion - Biomimetics - Bionics - Rollers (machine components) - Soil mechanics - Soil testing - Soils
Uncontrolled terms: Geometric structure - Hydrophobic properties - Identical conditions - Maximal adhesions - Press rollers - Soil adhesion - Soil compaction - Traction resistance
Classification code: 483.1 Soils and Soil Mechanics - 601.2 Machine Components - 603.1 Machine Tools, General - 731.1 Control Systems - 801 Chemistry - 801.2 Biochemistry - 951 Materials Science
DOI: 10.6041/j.issn.1000-1298.2014.04.021
Database: Compendex
|
21. Accession number: 20142117745315
Title: Drying characteristics and kinetic analysis on municipal solid waste in Guangzhou
Authors: Chen, Shu1, 2 ; Ma, Xiaoqian1
Author affiliation: 1 School of Electric Power, South China University of Technology, Guangzhou 510640, China
2 College of Electromechanical Engineering, Zhongkai University of Agriculture and Technology, Guangzhou 510225, China
Corresponding author: Ma, X. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 4
Issue date: 2014
Publication year: 2014
Pages: 208-213
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: A series of drying experiments on municipal solid waste(MSW) in Guangzhou were conducted in air dry oven, simulating the drying process in incineration. The influence of temperature on drying characteristics of MSW was analyzed. Seven different drying models were fitted to the experimental data as comparing the correlation coefficient and chi-squared value. The optimal drying models were obtained to predict experimental drying process. The results showed that drying time was shorter and the maximum drying rate was higher with the higher drying temperature. The drying time decreased from 322 min to 102 min and the maximum drying rate increased from 0.009 g/(g·min) to 0.027 g/(g·min) as the drying temperature rising from 100°C to 160°C. The experimental drying process could be described accurately by page, Modified page and Weibull distribution models. The effective diffusivity of MSW changed from 2.212×10-9 m2/s to 8.044×10-9 m2/s with fick's diffusivity model. The MSW activation energy of 27.035 kJ/mol was determined through Arrhenius equation.
Number of references: 23
Main heading: Drying
Controlled terms: Activation energy - Diffusion - Food technology - Incineration - Municipal solid waste - Weibull distribution
Uncontrolled terms: Arrhenius equation - Correlation coefficient - Drying characteristics - Drying model - Drying temperature - Effective diffusivities - Maximum drying rate - Municipal solid waste (MSW)
Classification code: 452 Municipal and Industrial Wastes; Waste Treatment and Disposal - 642.1 Process Heating - 822 Food Technology - 922.2 Mathematical Statistics - 931.1 Mechanics - 931.3 Atomic and Molecular Physics
DOI: 10.6041/j.issn.1000-1298.2014.04.033
Database: Compendex
|
22. Accession number: 20142117745291
Title: Estimating sliding parameters of agricultural tracked robot based on UKF
Authors: Jiao, Jun1 ; Wang, Hongxi2 ; Chen, Yiqiong1; Chu, Gangxiu1; Xiao, Guang3; Lu, Lin1
Author affiliation: 1 College of Information and Computer, Anhui Agricultural University, Hefei 230036, China
2 School of Science, Anhui Agricultural University, Hefei 230036, China
3 Institute of Automotive Engineering, Hefei University of Technology, Hefei 230009, China
Corresponding author: Wang, H. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 4
Issue date: 2014
Publication year: 2014
Pages: 55-60
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to real-time achieve accurate sliding parameters between tracks of a agricultural tracked robot and ground and improve control accuracy, a dynamics equation and nonlinear measurement equation of agricultural tracked robot were deduced by analyzing working principle of an agricultural tracked robot and using dynamics principle. Then an estimation system based on the unscented Kalman filter(UKF) was designed to estimate the precision pose parameters of agricultural tracked robot. Through this estimation the system sliding parameters might be reconstructed relying on kinematics analysis, which couldn't be directly measured before. The simulation and experimental results suggested that with careful modeling of agricultural tracked robot, the estimation system was able to provide reliable and high update rate sliding parameters, which were taken as the basis for accurate control.
Number of references: 15
Main heading: Parameter estimation
Controlled terms: Agriculture - Estimation - Nonlinear equations - Robots
Uncontrolled terms: Control accuracy - Dynamics equation - Estimation systems - Kinematics analysis - Nonlinear measurement - Sliding parameters - Tracked robot - Unscented Kalman Filter
Classification code: 731 Automatic Control Principles and Applications - 821 Agricultural Equipment and Methods; Vegetation and Pest Control - 921 Mathematics - 921.1 Algebra
DOI: 10.6041/j.issn.1000-1298.2014.04.009
Database: Compendex
|
23. Accession number: 20142117745327
Title: Root growth model of lettuce under different cultivation substrates and irrigation modes
Authors: Liu, Zhigang1 ; Wang, Jizhang1; Xu, Yunfeng1; Li, Pingping1, 2
Author affiliation: 1 Key Laboratory of Modern Agricultural Equipment and Technology, Ministry of Education, Jiangsu University, Zhenjiang 212013, China
2 College of Forest Resources and Environment, Nanjing Forestry University, Nanjing 210037, China
Corresponding author: Li, P. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 4
Issue date: 2014
Publication year: 2014
Pages: 284-288
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: To find out the effect of cultivation methods on vegetable root, the lettuce root length, root depth and root width radius were studied in four cultivation substrates under drip and micro-sprinkler irrigation. The result indicated that root characters of lettuce cultivated in different substrates were no significantly different at 0.05 among different irrigation methods. Based on the experimental data of lettuce root, the simulation models for lettuce root length and root depth were established using the scale of effective cumulative temperatures (DD). The root depth in different layers and DD were used as the dependent variables to establish the root width radius model. The repeat test data were employed to verify the establishing models. The root mean square error and relative error between simulated and observed values were only 290 cm, 0.81 cm, 0.63 cm and 15%, 12%, 13% for lettuce root length, root depth and root width radius under drip irrigation and micro-sprinkler irrigation.
Number of references: 15
Main heading: Sprinkler systems (irrigation)
Controlled terms: Computer simulation - Dynamic models - Irrigation - Mean square error - Substrates
Uncontrolled terms: Cultivation substrates - Dependent variables - Different layers - Different substrates - Irrigation methods - Irrigation modes - Lettuce root - Root mean square errors
Classification code: 461 Bioengineering and Biology - 723.5 Computer Applications - 731.1 Control Systems - 801 Chemistry - 821.1 Agricultural Machinery and Equipment - 821.3 Agricultural Methods - 921 Mathematics
DOI: 10.6041/j.issn.1000-1298.2014.04.045
Database: Compendex
|
24. Accession number: 20142117745316
Title: Thermodynamic analysis of simplified Kalina cycle system
Authors: Hu, Bing1, 2 ; Luo, Chao1; Ma, Weibin1
Author affiliation: 1 Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China
2 University of Chinese Academic of Science, Beijing 100864, China
Corresponding author: Hu, B. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 4
Issue date: 2014
Publication year: 2014
Pages: 214-219
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: A Kalina cycle power system was developed. The net power output, net power output per ton of geofluid, energy efficiency, and heat exchanger area of per net power were determined as the performance criteria of the power system. The influences of ammonia water mass fraction, solution circulation ratio, geofluid temperature, cooling water temperature, and the heat exchanger end temperature difference on performance criteria were analyzed. Results showed that the performance could be changed by adjusting ammonia water mass fraction. The optimal solution circulation ratio value was about 4 and the corresponding ammonia water mass fraction difference was about 12%~13%. The net power output per ton of geofluid increases and energy efficiency decreased by increasing the heat exchanger end temperature difference.
Number of references: 15
Main heading: Energy efficiency
Controlled terms: Heat exchangers - Oceanography - Thermoanalysis - Thermoelectric power
Uncontrolled terms: Ammonia-water mixture - Circulation ratio - Cooling water temperature - Heat-exchanger areas - Kalina cycle - Optimal solutions - Performance criterion - Thermo dynamic analysis
Classification code: 471.1 Oceanography, General - 525.2 Energy Conservation - 616.1 Heat Exchange Equipment and Components - 701.1 Electricity: Basic Concepts and Phenomena - 801 Chemistry
DOI: 10.6041/j.issn.1000-1298.2014.04.034
Database: Compendex
|
25. Accession number: 20142117745324
Title: Investigating senescence status of wheat leaves by nuclear magnetic resonance
Authors: Du, Guangyuan1 ; Tang, Yan2 ; Zhang, Songwu1; Wang, Changfa3; Guo, Aiguang2
Author affiliation: 1 College of Science, Northwest A and F University, Yangling, Shaanxi 712100, China
2 College of Life Sciences, Northwest A and F University, Yangling, Shaanxi 712100, China
3 College of Agronomy, Northwest A and F University, Yangling, Shaanxi 712100, China
Corresponding author: Tang, Y. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 4
Issue date: 2014
Publication year: 2014
Pages: 264-270
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Nuclear magnetic resonance (NMR) technique has been broadly used in probing plant water relations. However, the relationship between NMR parameters and photosynthetic traits is still not clear. An NMR system was constructed to perform non-imaging relaxation measurement or magnetic resonance imaging on wheat non-invasively and non-destructively. It was found that from the onset of leaf senescence to the degradation stage, the average T2 relaxation time (T2,mean) increased gradually and the chlorophyll content decreased, while the amplitude (A) of T2 relaxation spectrum and water content kept stable. When wheat leaves approached cell death, all of the above mentioned NMR and physiological parameters decreased to its minimum value. It was deduced that A and the water content of wheat leaves were linearly correlated. On the other hand, T2,mean was related with leaf senescence status. Therefore, non-imaging T2 relaxation technique was thought a fast and powerful method to estimate the senescence status of wheat leaf. In addition, T1 weighted imaging and T2 weighted imaging could represent leaf physiological status directly based on the relaxation property. T1 weighted imaging was comparatively time-saving, whereas T2 weighted imaging was much more sensitive to leaf aging.
Number of references: 20
Main heading: Nuclear magnetic resonance
Controlled terms: Cell death - Degradation - Magnetic resonance imaging - Physiological models - Relaxation time
Uncontrolled terms: Nuclear magnetic resonance techniques - Photosynthetic traits - Physiological parameters - Plant water relations - Relaxation measurements - Relaxation techniques - Senescence - Wheat leaf
Classification code: 461.1 Biomedical Engineering - 461.9 Biology - 802.2 Chemical Reactions - 931 Classical Physics; Quantum Theory; Relativity - 931.2 Physical Properties of Gases, Liquids and Solids - 933 Solid State Physics
DOI: 10.6041/j.issn.1000-1298.2014.04.042
Database: Compendex
|
26. Accession number: 20142117745308
Title: Effects of mineralization degrees on soil infiltration under moistube-irrigation
Authors: Niu, Wenquan1, 2 ; Xue, Wanlai1, 3
Author affiliation: 1 Institute of Soil and Water Conservation, CAS and MWR, Yangling, Shaanxi 712100, China
2 Institute of Soil and Water Conservation, Northwest A and F University, Yangling, Shaanxi 712100, China
3 University of Chinese Academy of Sciences, Beijing 100049, China
Corresponding author: Niu, W. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 4
Issue date: 2014
Publication year: 2014
Pages: 163-172
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to explore the impact of mineralization degrees on infiltration character of soil under moistube-irrigation, an indoor soil box simulation experiment method was used to investigate the infiltration character of soil water under five different mineralization degrees selectively. Results indicated that the degree of mineralization had small impact on the shapes of soil wetted zone, and the wetting front shape were similar to circle. Degree of mineralization had a relatively bigger influence on the volume of wetted soil. The volume of wetted soil in mineralized water was bigger than that in pure water. When the degree of mineralization was 3 g/L, the wetting front (horizontal, vertical up and down) migration distance was the farthest, which had a power function relationship with time. The mineralized water could increase cumulative infiltration. However the relationship between cumulative infiltration and degree of mineralization was not linear relationship. The cumulative infiltration and average soil moisture content was the biggest when the degree of mineralization was 3 g/L. The results of this study provided reference for the utilization of moistube-irrigation with mineralized water.
Number of references: 28
Main heading: Infiltration
Controlled terms: Irrigation - Mineralogy - Soil moisture - Wetting
Uncontrolled terms: Cumulative infiltrations - Experiment methods - Linear relationships - Migration distance - Mineralization degrees - Moistube-irrigation - Soil infiltration - Wetting fronts
Classification code: 482 Mineralogy - 483.1 Soils and Soil Mechanics - 821.3 Agricultural Methods - 931.2 Physical Properties of Gases, Liquids and Solids
DOI: 10.6041/j.issn.1000-1298.2014.04.026
Database: Compendex
|
27. Accession number: 20142117745284
Title: Damping characteristics parameter identification of controllable vane damp based on turbulent model
Authors: Wang, Wenrui1 ; Yan, Xiaoqiang1; Gu, Liang2
Author affiliation: 1 School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, China
2 School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China
Corresponding author: Wang, W. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 4
Issue date: 2014
Publication year: 2014
Pages: 8-13
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: A hydraulic turbulent model was established based on the controllable vane damper structure analysis, and the hydro-structure of the vane was simulated. Based on the test data in the different temperature of damping force and velocity input, the parameters about the hydraulic turbulent model were identified. In the different temperature, comparison of the test data and results of calculation with the fitting parameters showed that the parameters were correct and the method was valid. From the fitting parameters and calculation result, controllable vane damp design and character analysis could be supported. The temperature could influence the damping force under the effect of high temperature and high speed, so that the damping characteristics should be obtained based on the principle of turbulence model integrated traffic parameters study finally through the simulation analysis. Parameter identified had the implications derived from the mathematical theory and clear physical meaning. It can be applied in characteristics analysis of other types of shock absorber.
Number of references: 21
Main heading: Computer simulation
Controlled terms: Damping - Turbulence models
Uncontrolled terms: Attenuation characteristics - Calculation results - Characteristics analysis - Damping characteristics - High temperature and high speed - Parameter identity - Simulation analysis - Turbulent models
Classification code: 443.1 Atmospheric Properties - 723.5 Computer Applications - 931.1 Mechanics
DOI: 10.6041/j.issn.1000-1298.2014.04.002
Database: Compendex
|
28. Accession number: 20142117745335
Title: Motion error modeling and compensating for 6_PUS parallel robot of wind tunnel support system
Authors: Tan, Xingqiang1 ; Zhang, Jian1; Xie, Zhijiang2
Author affiliation: 1 College of Mechanic Engineering, Panzhihua University, Panzhihua 617000, China
2 College of Mechanic Engineering, Chongqing University, Chongqing 400044, China
Corresponding author: Tan, X. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 4
Issue date: 2014
Publication year: 2014
Pages: 334-340 346
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Aiming at a kind of new 6-DOF wind tunnel support parallel robot, using the method of D-H single-chain, and together with the method of parameters-perturbation, the motion error model of this support parallel robot used in wind tunnel was established, and simulation program based on this motion error model was made. According to six kinds of typical motion mode of wind tunnel test, six kinds of posture errors of different motion mode of this parallel support system was analyzed and error curves of typical motion mode were also get by simulation. Using the motion error models obtained from the simulation, the corresponding error controlling methods was carried during this parallel support robot components designing and assembling, and ensuring the design and manufacture accuracy of the parallel support robot reached the requirement of wind tunnel tests, and error estimation program which was similar to that of the motion error simulation was embedded in the wind tunnel test to compensate the motion errors of posture and location of tested aircraft model, and it was proved in practice that the precision of wind tunnel test data was improved.
Number of references: 20
Main heading: Robots
Controlled terms: Aircraft models - Computer simulation - Error analysis - Errors - Machine design - Mechanisms - Software testing - Wind stress - Wind tunnels
Uncontrolled terms: Controlling methods - Design and manufactures - Error model - Estimation program - Parallel mechanisms - Simulation program - Support systems - Wind tunnel support
Classification code: 402 Buildings and Towers - 421 Strength of Building Materials; Mechanical Properties - 601 Mechanical Design - 601.3 Mechanisms - 651.2 Wind Tunnels - 652.1 Aircraft, General - 723.5 Computer Applications - 731 Automatic Control Principles and Applications - 921 Mathematics - 921.6 Numerical Methods
DOI: 10.6041/j.issn.1000-1298.2014.04.053
Database: Compendex
|
29. Accession number: 20142117745288
Title: Effect of heat loss on micro flame stability in confined space
Authors: Gan, Yunhua1 ; Luo, Yanlai1; Feng, Qingying2; Shi, Yanling3
Author affiliation: 1 School of Electric Power, South China University of Technology, Guangzhou 510640, China
2 Guangzhou China Resources Thermal Power Co. Ltd., Guangzhou 511455, China
3 College of Engineering, South China Agricultural University, Guangzhou 510640, China
Corresponding author: Gan, Y. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 4
Issue date: 2014
Publication year: 2014
Pages: 37-41 27
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: The characteristics of ethanol-air microscale laminar-flow diffusion combustion were investigated. Combined with experimental study and numerical simulation, the effects of surface heat loss on the flame stability in the confined space were systematically analyzed. The surface heat loss was controlled by electrical heating inside. According to the results, the electrical heating reduced the effects of heat loss and enhanced the stability effectively. Using the appropriate electrical heating power, it reached the widest stability limits of combustion. The flame feature size and temperature distribution were both changed by the electrical heating. The electrical heating raised the flame temperature. The chemical reaction rate became bigger, and the micro-flame shifed upstream. Within a certain range, the electrical heating increase was greater than the increase of the heat loss. The electrical heating inhibited the heat loss and enhanced the stability.
Number of references: 20
Main heading: Heat losses
Controlled terms: Combustion - Electric heating - Thermodynamic stability
Uncontrolled terms: Confined space - Diffusion combustion - Electrical heating - Flame stability - Flame temperatures - Micro-combustion - Stability limit - Surface heat loss
Classification code: 521.1 Fuel Combustion - 641.1 Thermodynamics - 641.2 Heat Transfer - 704.2 Electric Equipment
DOI: 10.6041/j.issn.1000-1298.2014.04.006
Database: Compendex
|
30. Accession number: 20142117745296
Title: Automatic detection for external features of grafting seedlings based on machine vision
Authors: Cui, Yongjie1 ; Wang, Xiaxia1; Xu, Liqing1; Chen, Tong1; Li, Shaohua1; Fu, Longsheng1
Author affiliation: 1 College of Mechanical and Electronic Engineering, Northwest A and F University, Yangling, Shaanxi 712100, China
Corresponding author: Cui, Y. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 4
Issue date: 2014
Publication year: 2014
Pages: 89-95
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: An automatic detection method for external features of grafting seedlings based on mathematical modeling was studied. The detecting items included growth status (straight or curved, bending direction), cotyledons parameters (cotyledon flare angle, cotyledons flare spans), hypocotyls parameters (curvature, hypocotyl length, hypocotyl shaft), and other external parameters. First, image preprocessing was used to extract the binary image. Then, a reference point and its position were determined by statistic of horizontal pixels. Next, growth status was decided by a set inclination angle of the minimal bounding rectangle of the hypocotyl and its width. After that, the cotyledons span was calculated by the distance of the two cotyledons endpoint, and the cotyledons angle was computed by the angle between two lines that fitting with the bottom of flat cotyledons. Finally, the stem length and the coarse strains were obtained by doing slope compensations to two sections of stem separately which was divided at the point with maximum curvature. Results were compared with manually measured data, and shown that the coefficients of plant height, plant coarse, and cotyledon span were 0.935 1, 0.899 9 and 0.903 4, respectively. And the relative errors of them were less than 7%, 5% and 7%, while the absolute errors of them were less than 4 mm, 0.2 mm and 6 mm, respectively.
Number of references: 23
Main heading: Computer vision
Controlled terms: Errors - Mathematical models
Uncontrolled terms: Automatic Detection - Automatic detection method - Bending directions - External features - Grafting seedlings - Image preprocessing - Inclination angles - Slope compensation
Classification code: 723.5 Computer Applications - 921 Mathematics
DOI: 10.6041/j.issn.1000-1298.2014.04.014
Database: Compendex
|
31. Accession number: 20142117745300
Title: Numerical simulation based on CFD-DEM and experiment of grain moving laws in inertia separation chamber
Authors: Jiang, Enchen1 ; Sun, Zhanfeng1 ; Pan, Zhiyang1; Wang, Lijun1
Author affiliation: 1 College of Engineering, Northeast Agricultural University, Harbin 150030, China
Corresponding author: Sun, Z. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 4
Issue date: 2014
Publication year: 2014
Pages: 117-122
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to obtain grain moving laws in inertia separation chamber of combine harvester threshing prior to cutting, grains motion was simulated by using computational fluid dynamics and discrete element coupled methods. Simulation results showed that grain particles were separated from short straw through airflow and the performance of chamber separating and cleaning grain was improved with the increasing of airflow velocity, while the turbulence phenomenon in the rear of chamber got more serious and airflow pressure drop was increased. Not full grain particles also deposited in chamber. In order to verify the validity of simulation results, the experimental test was conducted. Experimental results and simulation results were basically accord, which showed that the simulation of grain motion in inertia separation chamber based on CFD-DEM was feasible. The results would be a better basis to improve the performance of inertia separation chamber to separate and clean grain.
Number of references: 15
Main heading: Computer simulation
Controlled terms: Air - Computational fluid dynamics - Experiments - Finite difference method - Harvesters - Numerical models - Separation
Uncontrolled terms: Air flow velocity - Combine harvesters - Coupled method - Experimental test - Grain motion - Grain particles - Inertia separation chamber - Threshing prior to cuttings
Classification code: 723.5 Computer Applications - 802.3 Chemical Operations - 804 Chemical Products Generally - 821.1 Agricultural Machinery and Equipment - 901.3 Engineering Research - 921 Mathematics - 921.6 Numerical Methods
DOI: 10.6041/j.issn.1000-1298.2014.04.018
Database: Compendex
|
32. Accession number: 20142117745289
Title: Flowrate measurement of upper-nozzles in cylinder head based on orthogonal design method
Authors: Wang, Zhaowen1 ; Zhao, Qiang1; Chen, Xiong1; Zhang, Kun1; Huang, Ronghua1
Author affiliation: 1 College of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
Corresponding author: Wang, Z. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 4
Issue date: 2014
Publication year: 2014
Pages: 42-48 21
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: With the improvement of power density of internal combustion engine, the coolant jacket structure is becoming more and more important. The design and optimization of coolant jacket depend heavily on the construction and position of the upper-nozzles, so that the flowrate measurement in the upper-nozzles will benefit those design and optimization. However, during the flowrate measurement, the construction parameters and installation parameters of the measurement rig will affect the measurement error significantly. This paper explored the relationship between these parameters and the measurement error by means of CFD numerical simulation based on orthogonal design method. In order to control the measurement error in 3%, the flow in many upper-nozzle schemes were simulate, and then the range analysis of the simulation results were achieved and the levels of each factor were optimized. After the optimization, the suitable levels of each factor were determined, and the maximum measurement error of the optimum schemes was reduced to 2.95%. At the end, the paper achieved a measurement experiment to correct the numerical simulation, and the difference between simulation error and experimental error was only 2.07% according to the experimental results, which verified the reliability of the numerical simulation and accuracy of the measurement technology.
Number of references: 20
Main heading: Parameter estimation
Controlled terms: Computational fluid dynamics - Computer simulation - Coolants - Cylinder heads - Design - Internal combustion engines - Measurement errors - Measurements - Nozzle design - Nozzles - Numerical models - Optimization
Uncontrolled terms: CFD numerical simulations - Construction parameter - Design and optimization - Measurement experiments - Measurement technologies - Orthogonal design method - Structure parameter - Upper-nozzles
Classification code: 408 Structural Design - 612.1 Internal Combustion Engines, General - 612.1.1 Internal Combustion Engine Components - 631.1 Fluid Flow, General - 723.5 Computer Applications - 731.1 Control Systems - 921 Mathematics - 921.5 Optimization Techniques - 922 Statistical Methods - 941 Acoustical and Optical Measuring Instruments - 942 Electric and Electronic Measuring Instruments - 943 Mechanical and Miscellaneous Measuring Instruments - 944 Moisture, Pressure and Temperature, and Radiation Measuring Instruments
DOI: 10.6041/j.issn.1000-1298.2014.04.007
Database: Compendex
|
33. Accession number: 20142117745290
Title: Complex collision model in high-speed gripping of fruit
Authors: Liu, Jizhan1 ; Bai, Xinxin1; Li, Pingping2; Mao, Hanping1
Author affiliation: 1 Key Laboratory of Modern Agricultural Equipment and Technology, Ministry of Education, Jiangsu University, Zhenjiang 212013, China
2 College of Forest Resources and Environment, Nanjing Forestry University, Nanjing 210037, China
Corresponding author: Liu, J. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 4
Issue date: 2014
Publication year: 2014
Pages: 49-54 172
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: This paper focused on the special collision phenomenon of fruit gripping with its own characteristics of continuous energy input and restrained deformation. The gripping collision process was divided into three stages: constant-speed loading, collision decelerating and stress relaxation, and a three-stage gripping collision model was put forward under the conditions of constant static loading capacity and constant speed control mode, which was based on the stage dynamic characteristic of gripping collision process and viscoelastic Burger's model of fruits. It was proved by test that the prediction of the peak collision force was feasible, and the predicton error under initial gripping speed of 19.2 mm/s was 1.12%. By calculating with this model, it was found that time needed to grip fruit in different ripe period under initial speed of 6 mm/s was 0.62~1.24 s, and further raising the initial speed might have very limited effectiveness to improve the gripping efficiency. The peak collision force and fruit deformation were proportional and approximately proportional to initial gripping speed, respectively. Probability of skin rupture increased greatly with initial gripping speed. When initial gripping speed was under 20 mm/s, probability of skin rupture of green ripening stage and early red ripening stage were the greatest and the least, respectively. This three-stage gripping collision model may provide helpful reference to discover the special law of gripping collision and to achieve high-speed safe gripping of fruits.
Number of references: 25
Main heading: Fruits
Controlled terms: Deformation - Models - Speed - Viscoelasticity
Uncontrolled terms: Collision - Collision forces - Collision process - Constant speed control - Continuous energy - Dynamic characteristics - High-speed gripping - Viscoelastic
Classification code: 421 Strength of Building Materials; Mechanical Properties - 422 Strength of Building Materials; Test Equipment and Methods - 821.4 Agricultural Products - 902.1 Engineering Graphics - 931.1 Mechanics
DOI: 10.6041/j.issn.1000-1298.2014.04.008
Database: Compendex
|
34. Accession number: 20142117745318
Title: Correction algorithm of lighting non-uniformity on spherical fruit
Authors: Li, Jiangbo1, 2 ; Huang, Wenqian1; Zhang, Baohua1; Peng, Yankun2; Zhao, Chunjiang1
Author affiliation: 1 Beijing Research Center of Intelligent Equipment for Agriculture, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China
2 College of Engineering, China Agricultural University, Beijing 100083, China
Corresponding author: Zhao, C. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 4
Issue date: 2014
Publication year: 2014
Pages: 226-230
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In terms of spherical fruits, the lighting was usually uneven distribution on the surface of fruits due to the larger change of curvature from fruit surface. Therefore, some drawbacks such as large error and low accuracy were still existed in the grading and assessing for fruit peel color. In order to solve this problem, B-spline lighting correction method was proposed in this study. Using the proposed algorithm, R, G and B channel images abstracted from original RGB image were firstly corrected respectively. Then, the corrected RGB image was changed into HIS color space image and hue H and illumination I component images were abstracted. Finally, the correction performance was assessed by computing the standard deviation of pixels in H and I component images before and after correction. For the investigated 160 orange sample images, the result showed that the corrected images were more uniform in terms of hue and illumination. Only 21.57% and 33.94% of mean standard deviations of original hue and illumination component were obtained. The uniformity of hue and illumination was effectively improved.
Number of references: 18
Main heading: Lighting
Controlled terms: Abstracting - Algorithms - Citrus fruits - Color - Computer vision - Grading - Image processing - Statistics
Uncontrolled terms: Color transformation - Correction algorithms - Correction performance - Illumination components - Lighting corrections - Mean standard deviation - Orange - Standard deviation
Classification code: 707 Illuminating Engineering - 723 Computer Software, Data Handling and Applications - 723.5 Computer Applications - 741 Light, Optics and Optical Devices - 821.4 Agricultural Products - 903.1 Information Sources and Analysis - 913.3 Quality Assurance and Control - 921 Mathematics - 922.2 Mathematical Statistics
DOI: 10.6041/j.issn.1000-1298.2014.04.036
Database: Compendex
|
35. Accession number: 20142117745319
Title: Design and experiment of dryer for high moisture grain storage
Authors: Li, Changyou1 ; Zhang, Ye1; Mai, Zhiwei1
Author affiliation: 1 Key Laboratory of Key Technology on Agricultural Machine and Equipment, Ministry of Education, South China Agricultural University, Guangzhou 510642, China
Corresponding author: Li, C. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 4
Issue date: 2014
Publication year: 2014
Pages: 231-235
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to solve the problem of excessive energy consumption of high moisture grain drying, a high moisture grain dryer was designed, and the state parameters in high moisture grain drying and the change characteristics of moisture binding energy were analyzed. From the theoretical and experimental evidences, the utilization effects of drying potential energy and the changing process for the temperature and moisture of high moisture grain dryer were illustrated and observed. The experimental result showed that the temperature of grain could be reduced and was lower than environment temperature nearly 10°C when temperature was 30°C, relative humidity was 40% and drying rate was more than 0.76%/h. The result also pointed out the design method of grain drying process for saving energy and provided energy efficiency of pre-drying equipment for large-scale grain drying companies.
Number of references: 21
Main heading: Moisture
Controlled terms: Binding energy - Design - Dryers (equipment) - Drying - Energy efficiency - Energy utilization - Experiments
Uncontrolled terms: Design method - Environment temperature - Experimental evidence - Grain dryers - Grain storage - High moisture - Saving energy - State parameters
Classification code: 408 Structural Design - 525.2 Energy Conservation - 525.3 Energy Utilization - 642.1 Process Heating - 801.4 Physical Chemistry - 802.1 Chemical Plants and Equipment - 901.3 Engineering Research
DOI: 10.6041/j.issn.1000-1298.2014.04.037
Database: Compendex
|
36. Accession number: 20142117745317
Title: Selection of NIR variables for online detecting soluble solids content of apple
Authors: Ouyang, Aiguo1 ; Xie, Xiaoqiang1; Liu, Yande1
Author affiliation: 1 School of Mechatronics and Electronical Engineering, East China Jiaotong University, Nanchang 330013, China
Corresponding author: Liu, Y. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 4
Issue date: 2014
Publication year: 2014
Pages: 220-225
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to improve the accuracy of online detecting soluble solids content (SSC) of apples by the method of near infrared spectroscopy, the combination of moving window partial least squares (MWPLS) and genetic algorithm (GA), successive projections algorithm (SPA) was used to select the characteristic variables, and then the partial least squares regression model was developed. The MW-GA model with the 36 selected characteristic variables obtained the best result with correlation coefficient of prediction (Rp) of 0.90 and root mean square error of prediction (RMSEP) of 0.70°Brix, which indicated that the combination of MWPLS and GA could select the characteristic variables of near infrared spectroscopy effectively.
Number of references: 25
Main heading: Genetic algorithms
Controlled terms: Fruits - Infrared devices - Least squares approximations - Mean square error - Near infrared spectroscopy - Principal component analysis - Regression analysis
Uncontrolled terms: Apple - Near Infrared - Partial least square (PLS) - Projection algorithms - Soluble solids
Classification code: 723 Computer Software, Data Handling and Applications - 741.3 Optical Devices and Systems - 821.4 Agricultural Products - 921 Mathematics - 921.6 Numerical Methods - 922.2 Mathematical Statistics
DOI: 10.6041/j.issn.1000-1298.2014.04.035
Database: Compendex
|
37. Accession number: 20142117745283
Title: Nonlinear control of quarter vehicle model with semi-active suspension based on solenoid valve damper
Authors: Yang, Liuqing1, 2 ; Chen, Wuwei1 ; Gao, Zhengang1; Chen, Yikai1
Author affiliation: 1 School of Mechanical and Automotive Engineering, Hefei University of Technology, Hefei 230009, China
2 Department of Automotive and Mechanical Engineering, Anhui Communications Vocational and Technical College, Hefei 230051, China
Corresponding author: Chen, W. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 4
Issue date: 2014
Publication year: 2014
Pages: 1-7 36
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: On the basis of experiments on force-speed characteristics of solenoid valve damper, a slide model control strategy based on saturated input was put forward for a quarter vehicle semi-active suspension with solenoid valve damper, which considered the nonlinear properties of vehicle semi-active suspension and output saturation properties of solenoid valve damper with adjustable damping force. A quarter vehicle nonlinear model with semi-active suspension and a suspension reference model with simplified input were built. A slide model controller was designed for a quarter vehicle nonlinear model. Meanwhile, considering the damping force output saturation property of solenoid valve damper, an assistant analysis system was designed to generate control compensation signal in order to compensate the saturation of the slide model controller. The results of simulation under Matlab/Simulink and experiments showed that the slide model controller based on saturated input could effectively eliminate the influence of output saturation of solenoid valve damper, and make the performance indexes, such as vehicle body vertical acceleration and suspension working space, close to the corresponding ideal output of a suspension reference model. It could also optimize the semi-active suspension design and control so as to improve vehicle ride comfort.
Number of references: 20
Main heading: Suspensions (components)
Controlled terms: Automobile suspensions - Computer simulation - Controllers - Damping - Experiments - Models - Nonlinear systems - Vehicles
Uncontrolled terms: Nonlinear - Saturated SMC - Semi active suspension - Simulation - Solenoid valve damper
Classification code: 432 Highway Transportation - 601.2 Machine Components - 632.1 Hydraulics - 723.5 Computer Applications - 732.1 Control Equipment - 901.3 Engineering Research - 902.1 Engineering Graphics - 921 Mathematics - 931.1 Mechanics - 961 Systems Science
DOI: 10.6041/j.issn.1000-1298.2014.04.001
Database: Compendex
|
38. Accession number: 20142117745298
Title: 3-D simulation for airflow field and droplets deposition of hanging cold sprayer
Authors: Li, Hui1 ; Qi, Lijun1 ; Wang, Pei2
Author affiliation: 1 College of Engineering, China Agricultural University, Beijing 100083, China
2 Department of Weed Science, University of Hohenheim, Stuttgart 70599, Germany
Corresponding author: Qi, L. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 4
Issue date: 2014
Publication year: 2014
Pages: 103-109 122
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to understand the airflow speed field and deposition distribution rules and characters of a designed hanging cold sprayer, several numerical spraying models for that based on CFD technology were established. Beside that, the verification experiments were conducted. The simulation results indicate that the effective blowing distance is positively related to the blowing speed of the cold sprayer. The cold sprayer gets the minimum blowing distance at the height of 1.5 m. The model gets larger ground mass-flow rate under the blowing speed of 5 m/s and 25 m/s. The model gets better uniformity under blowing speed greater than 20m/s and height greater than 2.0 m. The consequences of simulation and verification experiments show that, in the cold sprayer's blowing area, the relative deviation of modeling air flow field is between 10%~35%, and the relative deviation of droplets' deposition model is between 15%~35%. As the consequence, both of the models can forecast the cold sprayer's air flow field and the droplets' deposition distribution correctly.
Number of references: 21
Main heading: Computer simulation
Controlled terms: Air - Computational fluid dynamics - Deposition - Drops - Experiments - Flow fields - Speed
Uncontrolled terms: 3D simulations - Air flow fields - Airflow speed - CFD technologies - Cold sprayer - Deposition distribution - Deposition modeling - Relative deviations
Classification code: 631.1 Fluid Flow, General - 723.5 Computer Applications - 804 Chemical Products Generally - 813.1 Coating Techniques - 901.3 Engineering Research - 931.1 Mechanics
DOI: 10.6041/j.issn.1000-1298.2014.04.016
Database: Compendex
|
39. Accession number: 20142117745323
Title: Extraction of seedlings information based on improved edge segmentation algorithm
Authors: Li, Weitao1, 2 ; Peng, Daoli1; Wu, Jian2
Author affiliation: 1 Key Laboratory for Silviculture and Conservation, Ministry of Education, Beijing Forestry University, Beijing 100083, China
2 College of Geography Information and Tourism, Chuzhou University, Chuzhou 239000, China
Corresponding author: Li, W. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 4
Issue date: 2014
Publication year: 2014
Pages: 259-263 303
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Optimization of feature space and improvement of the segmentation algorithm are the keys of accurately obtaining seedling information using object-oriented technology. An improved edge segmentation algorithm was used to segment image based on dealing with the noise of multispectral images. The algorithm developed the simulated balloon expansion method, and could control the direction of the force field, so that the curves were made to split and collapse inwards. And the feature space made up of texture, shape, spectral features was built to accomplish seedling information extraction. The results showed that the total accuracy of seedling information extraction was 86% by the method of this paper, 12% higher than that of traditional methods, and the KAPPA coefficient was 0.814 5, 0.115 9 higher than that of traditional methods. The method of this paper could accomplish seedling information extraction quickly and accurately, and provide a reference for the accurately monitoring and decision making to management departmen. It has important meaning to forecast and evaluation for the future afforestation situation.
Number of references: 16
Main heading: Image segmentation
Controlled terms: Decision making - Information retrieval - Reforestation
Uncontrolled terms: Edge segmentation - Expansion methods - Kappa coefficient - Multi-spectral - Multispectral images - Object-oriented technology - Seedling - Segmentation algorithms
Classification code: 442.2 Land Reclamation - 723.5 Computer Applications - 741.1 Light/Optics - 912.2 Management
DOI: 10.6041/j.issn.1000-1298.2014.04.041
Database: Compendex
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40. Accession number: 20142117745304
Title: Design and experiment of bionic anti-drag subsoiler
Authors: Zhang, Jinbo1, 2 ; Tong, Jin1 ; Ma, Yunhai1
Author affiliation: 1 Key Laboratory of Bionic Engineering, Ministry of Education, Jilin University, Changchun 130025, China
2 College of Mechanical Engineering, Jiamusi University, Jiamusi 154007, China
Corresponding author: Tong, J. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 4
Issue date: 2014
Publication year: 2014
Pages: 141-145
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Efficient soil digging property of claw toe of Mus musculus was applied to the structure design of anti-drag subsoiler. The anti-drag subsoiler had exponential curve shape of soil-cutting edge of shaft. To compare tillage resistance, the subsoiling experiments were conducted using bionic anti-drag subsoiler and traditional subsoiler. The results showed that both tillage depth and forward velocity could affect on subsoiling resistance significantly and the tillage resistance increased with the tillage depth and forward velocity. The tillage resistances of bionic anti-drag subsoiler were reduced by 8.5% to 39.5% respectively compared with traditional subsoiler under the same experimental conditions and the effect of reducing resistance was obvious.
Number of references: 20
Main heading: Drag
Controlled terms: Agricultural machinery - Agriculture - Bionics - Experiments - Structural design
Uncontrolled terms: Anti-drag - Experimental conditions - Exponential curves - Forward velocity - Mus musculus - Structure design - Subsoiler
Classification code: 408.1 Structural Design, General - 651.1 Aerodynamics, General - 731.1 Control Systems - 821 Agricultural Equipment and Methods; Vegetation and Pest Control - 821.1 Agricultural Machinery and Equipment - 901.3 Engineering Research
DOI: 10.6041/j.issn.1000-1298.2014.04.022
Database: Compendex
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41. Accession number: 20142117745333
Title: Analysis of interference area in machining hyperboloidal surface
Authors: Huang, Zhidong1, 2 ; Zhang, Lei1 ; Zhao, Ji1
Author affiliation: 1 College of Mechanical Science and Engineering, Jilin University, Changchun 130025, China
2 Department of Mechanical Engineering, Liaoning Institute of Science and Technology, Benxi 117004, China
Corresponding author: Zhang, L. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 4
Issue date: 2014
Publication year: 2014
Pages: 322-326 321
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: The hyperboloidal surface was studied, which was common in complex surfaces. The mathematical model for machining hyperboloidal surface was set up. Based on the analysis of parameter characteristics of hyperboloidal surface, the variation law of the slope limit value of tangent at arbitrary point on hyperboloidal surface and the slope limit value of the axis of tool was discovered. Based on the variation law, the functional relationship between parabola parameter, tool parameter and the square of eccentricity was obtained. The parameter criterion, by which the interference on machining hyperboloidal surface could be avoided, was deduced. The interference areas corresponding to different functional relationships between cutting angle and the square of eccentricity were clarified. The simulation experiment results showed the validity of theoretical analysis, which facilitated the parameter selection for machining hyperboloidal surface.
Number of references: 20
Main heading: Mathematical models
Controlled terms: Machining
Uncontrolled terms: Analysis - Arbitrary points - Complex surface - Functional relationship - Interfecrence - Parameter characteristic - Parameter selection - Tool parameter
Classification code: 604.2 Machining Operations - 921 Mathematics
DOI: 10.6041/j.issn.1000-1298.2014.04.051
Database: Compendex
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42. Accession number: 20142117745325
Title: Parallel simulation of uniaxial scattered bamboo root system
Authors: Zhang, Yunwei1 ; Yu, Yong1; Wang, Dalong2; Zhou, Xuan2; Wang, Yanjun2
Author affiliation: 1 Faculty of Information Engineering and Automation, Kunming University of Science and Technology, Kunming 650500, China
2 Faculty of Modern Agricultural Engineering, Kunming University of Science and Technology, Kunming 650500, China
Corresponding author: Zhang, Y. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 4
Issue date: 2014
Publication year: 2014
Pages: 271-275 270
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: During the simulation of bamboo rhizomes, there are some faced difficulties caused by high strength of calculation and large amount of data. Therefore, it is hard to satisfy the simulation performance requirements by using traditional architecture based on single processor and serial computing. In order to solve this problem, a multi-nodes parallel simulation mechanism was proposed based on network compute cluster, and the parallel simulation platform was built for uniaxial scattered bamboo rhizomes. The parallel simulation platform was composed of modeling node, task managing node, graphics node and network switch in hardware. The growth model of uniaxial scattered bamboo rhizomes was constructed on the basis of SimRoot model, whose geometric architecture parameters and growth parameters can be obtained through experimental observation. Function decomposition method was used for dividing integral task of growth modeling into fragments, and the corresponding task scheduling mode was established. Then, multi-nodes parallel growth modeling mechanism was designed. Finally, as an example, multi-nodes parallel simulation experiments for Phyllostachys parvifolia were executed. The experimental results show that multi-nodes parallel simulation based on network computer cluster appears to have obvious efficiency in reducing memory demand and simulation time, which has good adaptability to the large-scale simulation of scattered bamboo rhizomes.
Number of references: 17
Main heading: Computer simulation
Controlled terms: Bamboo - Computer networks - Microcomputers
Uncontrolled terms: Function decomposition method - Growth modeling - Large scale simulations - Network computers - Parallel simulations - Simulation performance - Traditional architecture - Underground rhizome
Classification code: 716 Telecommunication; Radar, Radio and Television - 717 Optical Communication - 718 Telephone Systems and Related Technologies; Line Communications - 722 Computer Systems and Equipment - 722.4 Digital Computers and Systems - 723 Computer Software, Data Handling and Applications - 723.5 Computer Applications - 821.4 Agricultural Products
DOI: 10.6041/j.issn.1000-1298.2014.04.043
Database: Compendex
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43. Accession number: 20142117745294
Title: Detection of citrus fruits within tree canopy and recovery of occlusion contour in variable illumination
Authors: Lu, Jun1, 2 ; Sang, Nong1
Author affiliation: 1 State Key Laboratory of Science and Technology on Multi-Spectral Information Processing, Huazhong University of Science and Technology, Wuhan 430074, China
2 College of Science, Huazhong Agricultural University, Wuhan 430070, China
Corresponding author: Sang, N. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 4
Issue date: 2014
Publication year: 2014
Pages: 76-81 60
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: A method based on color information and contour fragments was developed to identify citrus fruits in variable illumination conditions in the tree canopy, in order to guide the robots for harvesting citrus fruits. The color properties of target objects within natural citrus-grove scenes under various light conditions were analyzed, and a preliminary segmentation was put forward by fusing the Chromatic aberration information and normalized RGB model. The set of contour fragments was constructed via detecting the significant edge of Chromatic aberration map of R and B channels. The valid subset was selected by three parameters of the frament: length, bending degree and concavo-convex geometry characteristic. The ellipse fitting procedure was done to every frament, and the valid ones were chosen by the knowledge of fruit shape. The results showed that the occlusion contour were effectively recoveried under various light conditions using the proposed method, and the relative error of occlusion recovery was 5.34%.
Number of references: 16
Main heading: Citrus fruits
Controlled terms: Aberrations - Error detection - Forestry
Uncontrolled terms: Chromatic aberration - Color information - Contour recoveries - Geometry characteristics - Light conditions - Matured citrus - Occlusion recovery - Variable illumination
Classification code: 721.1 Computer Theory, Includes Formal Logic, Automata Theory, Switching Theory, Programming Theory - 741 Light, Optics and Optical Devices - 821.0 Woodlands and Forestry - 821.4 Agricultural Products
DOI: 10.6041/j.issn.1000-1298.2014.04.012
Database: Compendex
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44. Accession number: 20142117745295
Title: Multi-source image registration for canopy organ of apple trees in mature period
Authors: Ma, Xiaodan1, 2 ; Liu, Gang1 ; Feng, Juan3; Zhou, Wei1
Author affiliation: 1 Key Laboratory of Modern Precision Agriculture System Integration Research, Ministry of Education, China Agricultural University, Beijing 100083, China
2 College of Information Technology, Heilongjiang Bayi Agricultural University, Daqing 163319, China
3 College of Information Science and Technology, Agricultural University of Hebei, Baoding 071001, China
Corresponding author: Ma, X. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 4
Issue date: 2014
Publication year: 2014
Pages: 82-88 140
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to construct colorful 3-D spatial structure of canopy accurately, apple tree canopies of maturation period were set for research object, and a PMD camera and a color camera were used to acquire multi-source organ images of apple tree canopies, which aimed at studying registration of multi-source images. SIFT algorithm was used to extract characteristic points from multi-source images and RANSAC algorithm optimized by objective function was adopted to purify feature vectors, which overcame scale change and effect of light. Bilinear mapping algorithm was employed as spatial mapping between multi-source images to avoide inaccuracy of using affine transformation to solve space mapping. The registration test in orchards with different natural environment showed that the method proposed was suitable for registration of multi-source images of apple tree canopies, and the registration accuracy could be 88.2% in sunny day of light environment, 84.2% in sunny day of backlight environment, 72.7% in cloudy day. The research finding could provide maintenance assurance for picking and yielding links of apple orchard after 3-D reconstruction of canopies.
Number of references: 18
Main heading: Three dimensional
Controlled terms: Algorithms - Cameras - Conformal mapping - Forestry - Fruits - Orchards
Uncontrolled terms: Affine transformations - Apple trees - Characteristic point - Color cameras - Multi-source images - Natural environments - Pmd cameras - Registration accuracy
Classification code: 742.2 Photographic Equipment - 821 Agricultural Equipment and Methods; Vegetation and Pest Control - 902.1 Engineering Graphics - 921 Mathematics
DOI: 10.6041/j.issn.1000-1298.2014.04.013
Database: Compendex
|
45. Accession number: 20142117745299
Title: Electrostatic field and atomization effect of multiple needle electrodes spraying blade
Authors: Gao, Quanjie1 ; Xia, Zhiyong1; Wang, Zhaohui1; Wang, Wei1; Qin, Tuo1; Huang, Hao1
Author affiliation: 1 College of Mechanical Automation, Wuhan University of Science and Technology, Wuhan 430081, China
Corresponding author: Gao, Q. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 4
Issue date: 2014
Publication year: 2014
Pages: 110-116
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: A model to solve the electrostatic field of multiple needle electrodes spraying blade was established. The distribution regularities of electric potential and electric intensity in the space out of multiple needle electrodes spraying blade were analyzed by Ansoft Maxwell software, and the influence of different gap of needle electrodes on electrostatic field was researched. Meanwhile, the particle sizes of the droplets atomized by the spraying blade with different gap needle electrodes were measured by laser particle size analyzer and the distribution law of the droplets was analyzed by computer. The results indicated that the highest electric intensity near the needles could be promoted to 2.7×106 V/m by the multiple needle electrodes, and the amplitude variation of electric field near the needle electrodes was the maximum. A region with high electric intensity uniform distributed could be formed when the gaps of needle electrodes were 2 mm which was the optimal gap, and the particle size of droplets atomized by the spraying blade decreased to 42 μm. Furthermore, the distribution of particle size was more uniform, and the results of experimental were consistent with the characteristics of electrostatic field obtained by evaluation.
Number of references: 19
Main heading: Needles
Controlled terms: Drops - Electric field effects - Electrodes - Electrostatics - Finite element method - Particle size - Particle size analysis
Uncontrolled terms: Amplitude variations - Blade - Distribution of particles - Distribution regularities - Electric intensity - Electrostatic spray - Laser particle size analyzer - Needle electrodes
Classification code: 443.1 Atmospheric Properties - 701.1 Electricity: Basic Concepts and Phenomena - 704.1 Electric Components - 819.6 Textile Mills, Machinery and Equipment - 921.6 Numerical Methods - 943.2 Mechanical Variables Measurements - 951 Materials Science
DOI: 10.6041/j.issn.1000-1298.2014.04.017
Database: Compendex
|
46. Accession number: 20142117745322
Title: Biological effects of pulsed electric field based on multi-shelled dielectric model of spherical cell
Authors: Zhang, Xiaohui1 ; Zhang, Zhixia2; Li, Yanzhen1; Ma, Hongbiao3; Zhang, Hongwei4; Liu, Wufeng1
Author affiliation: 1 College of Electrical Engineering, Henan University of Technology, Zhengzhou 450001, China
2 School of Information Engineering, Henan Institute of Science and Technology, Xinxiang 453003, China
3 Xinke College, Henan Institute of Science and Technology, Xinxiang 453003, China
4 The 27th Research Institute of China Electronics Technology Group Corporation, Zhengzhou 450047, China
Corresponding author: Zhang, X. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 4
Issue date: 2014
Publication year: 2014
Pages: 253-258 283
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to determine the electric parameters of pulsed electric field(PEF) biological effects, we researched the response of the equivalent circuit model in the PEF based on multi-shelled dielectric model of spherical cell. The simulation of the transfer function revealed that the cell outer membrane had low-pass filter characteristic and the inner membrane had band-pass filter characteristic. Time domain characteristic of transmembrane potentials on cell outer membrane showed that the pulsed electric field, which had less than 2.83 Hz of PEF frequency, more than 69.7 kV/m of PEF electric field intensity, and ms/μs class of pulse width, could produce reversible electroporation on cell outer membrane. Extremely low frequency pulsed electric field of 100 kV/m, 1 Hz and 80 ms was used to treat germinating mung beans seedling. It was found that the seed germination process was significantly promoted: on the 4th day of germination, and the shoot length and root length of germinating mung beans seed increased by 65.8% and 80.2% respectively compared with those of the control group.
Number of references: 29
Main heading: Electric fields
Controlled terms: Bandpass filters - Cells - Computer simulation - Cultivation - Cytology - Seed
Uncontrolled terms: Biological - Dielectric modeling - Electric field intensities - Equivalent circuit model - Extremely low frequencies - Simulation - Time domain characteristics - Transmembrane potentials
Classification code: 461.2 Biological Materials and Tissue Engineering - 701.1 Electricity: Basic Concepts and Phenomena - 703.2 Electric Filters - 723.5 Computer Applications - 821.3 Agricultural Methods - 821.4 Agricultural Products
DOI: 10.6041/j.issn.1000-1298.2014.04.040
Database: Compendex
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47. Accession number: 20142117745320
Title: Research progress of intelligent management for greenhouse environment information
Authors: Li, Pingping1 ; Wang, Jizhang2
Author affiliation: 1 College of Forest Resources and Environment, Nanjing Forestry University, Nanjing 210037, China
2 Key Laboratory of Modern Agricultural Equipment and Technology, Ministry of Education, Jiangsu University, Zhenjiang 212013, China
Corresponding author: Li, P. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 4
Issue date: 2014
Publication year: 2014
Pages: 236-243
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In recent years, with the rapid development of greenhouse agriculture and information technology, more and more modern information technologies were applied in greenhouse environment management. And those technologies promote the development of intelligent management technology for greenhouse environment. Aiming at the demands of intelligent management for greenhouse environment information oriented to internet of things(IOT), this paper analyzed the research progress of intelligent management for greenhouse environment information from three aspects, information acquisition, information processing and decision-making service of greenhouse environment, and the future studies about intelligent management of greenhouse environment were proposed.
Number of references: 77
Main heading: Environmental management
Controlled terms: Data processing - Greenhouses - Information technology - Internet
Uncontrolled terms: Environment - Greenhouse environment - Information acquisitions - Intelligent management - Internet of Things (IOT) - Modern information technologies
Classification code: 402.1 Industrial and Agricultural Buildings - 454.1 Environmental Engineering, General - 716 Telecommunication; Radar, Radio and Television - 717 Optical Communication - 718 Telephone Systems and Related Technologies; Line Communications - 723 Computer Software, Data Handling and Applications - 723.2 Data Processing and Image Processing - 903 Information Science
DOI: 10.6041/j.issn.1000-1298.2014.04.038
Database: Compendex
|
48. Accession number: 20142117745329
Title: Analysis and evaluation for core module based on product family
Authors: Wu, Yongming1 ; Hou, Liang1; Zhu, Qingyuan1 ; Lai, Rongshen1; Qian, Yaoyi1; Lin, Senquan1
Author affiliation: 1 Department of Mechanical and Electrical Engineering, Xiamen University, Xiamen 361005, China
Corresponding author: Zhu, Q. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 4
Issue date: 2014
Publication year: 2014
Pages: 294-303
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Aiming at the evolution problem of core module in product family design, the module evolution law and process evaluation were analyzed. A method for law analysis and evaluation in the module evolution was proposed. The relationship between customer demand and module design was also studied. The core module standardization and universal indicators based on existing products were analyzed. An analytical model for core module evolution was established in the process of needs analysis, and the model was trained by the history data. The changing law of design and craft was obtained by demand evidence reasoning in core module. Based on the evolution law analysis, the design parameter and reuse degree were also analyzed for core parts. Comprehensive evaluation value for core module evolution was gained. Finally, the effectiveness and feasibility of the method was tested by core module design of small wheel loaders.
Number of references: 15
Main heading: Product design
Controlled terms: Bayesian networks - Construction equipment
Uncontrolled terms: Analysis and evaluation - Comprehensive evaluation - Core module - Evidence reasoning - Evolution evaluation - Mass customization - Process Evaluation - Product family design
Classification code: 405.1 Construction Equipment - 913.1 Production Engineering - 921.4 Combinatorial Mathematics, Includes Graph Theory, Set Theory
DOI: 10.6041/j.issn.1000-1298.2014.04.047
Database: Compendex
|
49. Accession number: 20142117745321
Title: Progress of fluorescence imaging technology in detection of plant diseases
Authors: Lu, Jinzhu1 ; Jiang, Huanyu1 ; Cui, Di1
Author affiliation: 1 College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310058, China
Corresponding author: Jiang, H. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 4
Issue date: 2014
Publication year: 2014
Pages: 244-252
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Light incident upon a leaf surface will be partially reflected, partially absorbed and partially transmitted. Green plant tissues show an auto-fluorescence in the visible spectral range that is excited by UV or visible light. Key pigments in plants, including chlorophyll, carotenoid and other compounds, such as flavonol and anthocyanin, generally have the property of emitting fluorescence after excitation. Fluorescence imaging is a kind of advance techniques based on computer vision. The health information of plant can be acquired by analyzing its fluorescence image without influencing its growth condition. This paper reviewed the researches of applying fluorescence imaging technology to detect plant diseases and compared this technology with RGB imaging, hyperspectral imaging, multispectral imaging and thermal infrared imaging techniques.
Number of references: 50
Main heading: Fluorescence
Controlled terms: Imaging techniques - Spectroscopy - Thermography (imaging)
Uncontrolled terms: Fluorescence imaging - Health informations - Hyperspectral Imaging - Multispectral imaging - Nondestructive detection - Plant disease - Thermal infrared imaging - Visible spectral range
Classification code: 741 Light, Optics and Optical Devices - 741.1 Light/Optics - 742.1 Photography - 746 Imaging Techniques - 801 Chemistry
DOI: 10.6041/j.issn.1000-1298.2014.04.039
Database: Compendex
|
50. Accession number: 20142117745305
Title: Development of 1PJ-4.0 laser leveler installed on a wheeled tractor for paddy field
Authors: Hu, Lian1 ; Luo, Xiwen1 ; Lin, Chaoxing1; Yang, Weiwei1; Xu, Yi1; Li, Qing1
Author affiliation: 1 Key Laboratory of Key Technology on Agricultural Machine and Equipment, Ministry of Education, South China Agricultural University, Guangzhou 510642, China
Corresponding author: Luo, X. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 4
Issue date: 2014
Publication year: 2014
Pages: 146-151
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: A 1PJ-4.0 laser leveler installed on a wheeled tractor through the hydraulically driven 3-point linkage is developed. The harrow of the laser leveler can move up and move down by a cylinder and a planar four bar linkage. Hydraulic systems of the laser leveler are designed, including height position control hydraulic system, leveling control hydraulic system and folding hydraulic system. Experiments are carried out to investigate the dynamic response characteristics of the height position control system and leveling control system, respectively. The response time of leveling harrow moving up is almost twice as much as moving down. The moving up velocity of leveling harrow increases with the rate of accelerator pedal deepness, while the moving down velocity of leveling harrow is stable because a one-way throttle valve has been applied in the height position control hydraulic system. The average moving up time is about 3.31~4.23 s and the move down time is 1.7 s in testing space of 400 mm. It is bilateral symmetry of rotate angular velocity in the clockwise and reverse to control plow leveling. The results of the paddy field experiment show that the laser leveler installed on wheeled tractor for paddy field can work steadily, and the surface smoothness of paddy field can be obviously improved. The maximum height variation of paddy field surface decreases from 32 cm before leveling work to 4.9 cm, and the relative standard deviation reduces from 12.28 cm to 2.64 cm. The cumulative percentage of the sampling points, which have smaller than or equal to 3 cm of absolute difference value, is more than 69.4%.
Number of references: 20
Main heading: Agricultural machinery
Controlled terms: Control systems - Design - Dynamic response - Experiments - Hydraulic equipment - Position control - Tractors (agricultural) - Tractors (truck)
Uncontrolled terms: Absolute difference - Accelerator pedals - Dynamic response characteristics - Leveler - Leveling control systems - Paddy fields - Planar four-bar linkages - Relative standard deviations
Classification code: 408 Structural Design - 408.1 Structural Design, General - 632.2 Hydraulic Equipment and Machinery - 663.1 Heavy Duty Motor Vehicles - 731.1 Control Systems - 731.3 Specific Variables Control - 821.1 Agricultural Machinery and Equipment - 901.3 Engineering Research
DOI: 10.6041/j.issn.1000-1298.2014.04.023
Database: Compendex
|
51. Accession number: 20142117745313
Title: Estimation of erosion from earthquake landslides in Wenchuan area
Authors: Chen, Zhanpeng1 ; Lei, Tingwu1 ; Yan, Qinghong1; Hu, Heng2; Xiong, Mingbiao2; Li, Zhenlin3
Author affiliation: 1 College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, China
2 Sichuan General Monitoring Station of Soil and Water Conservation Ecological Environment, Chengdu 610041, China
3 College of Resources and Environment, Southwest University, Chongqing 400715, China
Corresponding author: Lei, T. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 4
Issue date: 2014
Publication year: 2014
Pages: 195-200
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: This paper describes a new method for determining the amount of earthquake-added soil erosion in Wenchuan earthquake area. To study on the method, typical landslides were chosen in Wenchuan County, and the information of typical landslide surface and its surrounding terrain were obtained by on-site measurement. The rill/gulley on the landslides were identified by image analysis, and the amounts of slope erosion from landslides were estimated by numerical calculation. The on-site measurement was carried out by using a 3-D laser scanner (HDS3000, Leica Company). The scanning distance reached as far as 300 m, with a distance measurement accuracy of ±4 mm at 50 m. The scanner was set up in front of the slope of the landslide to be measured. The distances from the scanner to near end and the far end of the landslide were 58.32 m and 136.81 m respectively. The scan grid was set to 20.0 cm horizontal and 20.0 cm vertical at 200 m from the scanner. The actual scan grid of the measured landslide was 5.8 cm×5.8 cm at the near end and 13.7 cm×13.7 cm at the far end, respectively. Landslides surfaces sections prior to erosion were specified by using least squares curve fitting method, and fitting it with curve of the second degree. The gully volume was estimated by comparing the result of surfaces prior to erosion and on-site data collected with laser scanner. The erosion volume of a typical landslide surface gully from 2008 to 2012 was estimated to be 355 m3. The method was verified with the data calculated by traditional cross section area method. The cross sections area and length of gully were calculated by the built-in method of the 3-D laser scanner. The result showed that the values calculated by the method suggested were a little bigger than that by the traditional cross section area method. The relative error of the method was 15.6% for the whole gully, with the lowest being 7.9% and the highest being 27.1% for the segmentations. The reasonable accuracy of the method showed that the rill/gully volume of landslide could be estimated reliably by using it in engineering application.
Number of references: 26
Main heading: Landslides
Controlled terms: Curve fitting - Earthquakes - Erosion - Landforms - Laser applications - Scanning
Uncontrolled terms: Earthquake-triggered landslides - Engineering applications - Gully erosion - Least squares curve fittings - Numerical calculation - On-site measurement - Reasonable accuracy - Wenchuan Earthquake
Classification code: 407 Maritime and Port Structures; Rivers and Other Waterways - 481.1 Geology - 483 Soil Mechanics and Foundations - 483.1 Soils and Soil Mechanics - 484 Seismology - 484.1 Earthquake Measurements and Analysis - 741.3 Optical Devices and Systems - 744.9 Laser Applications - 921.6 Numerical Methods
DOI: 10.6041/j.issn.1000-1298.2014.04.031
Database: Compendex
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52. Accession number: 20142117745309
Title: Chemical stability of aggregates under different types of soil
Authors: Xu, Shuang1 ; Wang, Yiquan1
Author affiliation: 1 College of Resources and Environment, Northwest A and F University, Yangling, Shaanxi 712100, China
Corresponding author: Xu, S. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 4
Issue date: 2014
Publication year: 2014
Pages: 173-178
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Using 4 different types of soil samples, the saturated hydraulic conductivity of soil was tested with falling head method by filling 0.25~5 mm soil aggregate dry screened in indoor and set with 1.40 g/cm3 bulk density in earth columns. The soil samples were immersed in five ammonium chloride solutions of different concentrations for 24, 48 and 72 h later respectively, which was used to discuss the reaction characteristics of different types of soil structural stabilities with saline solution as well as resistances to chemicals damage. The result indicated that the soil saturated hydraulic conductivity were not constant, and the saturated hydraulic conductivity of all 4 types of testing soil decreased significantly with the increasing of ammonium chloride concentration and soaking time. But different types of soil in response to salt solution were significantly different. The main conclusion was that not all water-stable soil aggregates owned stronger chemical stability, and the chemical stability of aggregates had relation with the type, quantity and quality of different cementing agents, especially had significant response to chemical substances in the soil solution.
Number of references: 29
Main heading: Aggregates
Controlled terms: Chemical stability - Chlorine compounds - Hydraulic conductivity - Soil moisture - Soil surveys - Soil testing - Stability
Uncontrolled terms: Ammonium chloride - Chemical substance - Falling head methods - Reaction characteristics - Saline solutions - Saturated hydraulic conductivity - Soil aggregate - Soil structural stability
Classification code: 406 Highway Engineering - 483.1 Soils and Soil Mechanics - 521 Fuel Combustion and Flame Research - 632.1 Hydraulics - 801 Chemistry - 803 Chemical Agents and Basic Industrial Chemicals - 804 Chemical Products Generally - 931 Classical Physics; Quantum Theory; Relativity - 951 Materials Science - 961 Systems Science
DOI: 10.6041/j.issn.1000-1298.2014.04.027
Database: Compendex
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53. Accession number: 20142117745287
Title: Dynamic optimization design for working device of hydraulic excavator based on modal analysis
Authors: Li, Fazong1, 2 ; Tong, Shuiguang1 ; Wang, Xiangbing1
Author affiliation: 1 Department of Energy Engineering, Zhejiang University, Hangzhou 310027, China
2 School of Mechanical Engineering, Ningbo University of Technology, Ningbo 315016, China
Corresponding author: Tong, S. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 4
Issue date: 2014
Publication year: 2014
Pages: 28-36
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: The structure finite element model for the working device of hydraulic excavator was established, and each order modal frequency and modal characteristics of working device were gotten by analyzing the free mode of the finite element model. The key modal frequency was determined, which influenced the dynamic performance of the working device, and taking the key modal frequency as the optimization goal the sensitivity analysis was conducted for the main structural parameters to set up the dynamic optimum design variables of working device. Taking the geometric constraints and performance constraints of work device as constraint conditions, the dynamic optimization design was conducted by using augmented Lagrangian method. The instance analysis showed that the structure stiffness was improved, and the structure deformation was reduced. And the dynamic working performance and the structure stability reliability for the working device were improved.
Number of references: 20
Main heading: Design
Controlled terms: Excavation - Excavators - Finite element method - Lagrange multipliers - Modal analysis
Uncontrolled terms: Augmented Lagrangian methods - Constraint conditions - Dynamic optimization design - Hydraulic excavator - Modal characteristics - Performance constraints - Structure dynamics - Working device
Classification code: 405.1 Construction Equipment - 408 Structural Design - 502.1 Mine and Quarry Operations - 921 Mathematics - 921.6 Numerical Methods
DOI: 10.6041/j.issn.1000-1298.2014.04.005
Database: Compendex
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54. Accession number: 20142117745286
Title: Anti-drive system design and hierarchy control strategy of electric drive vehicle
Authors: Jin, Chun1 ; Zheng, Shuyang1; Tian, Haiyong1
Author affiliation: 1 School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, China
Corresponding author: Jin, C. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 4
Issue date: 2014
Publication year: 2014
Pages: 22-27
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: To solve the problems of high idle speed and fuel consumption of wheeled electric drive vehicle on long downhill condition, an anti-drive energy feedback system was designed. The wheeled motors regenerative braking energy was feedback to DC bus and switched from rectifier to inverter module. The synchronous traction generator was driven by inverter as traction motor, which dragging the engine speed to the rated state, and at this time, the throttle was closed. Based on the hierarchical control idea, a three layers control algorithm of anti-drive feedback system, the up layer control algorithm of vehicle state estimation, middle layer of tracking generator rotor frequency and underlying layer of double fuzzy, was put forward. Bench test result showed the anti-drive energy feedback system could provide continuous braking force which equal to 20% of engine power, and save 15% of fuel. The control strategy has good robustness and strong driver intention recognition.
Number of references: 20
Main heading: Vehicles
Controlled terms: Algorithms - Electric drives - Regenerative braking
Uncontrolled terms: Anti-drive - Control strategies - Driver intention recognition - Electric-drive vehicles - Hierarchical control - Regenerative braking energies - Tracking generator - Vehicle state estimations
Classification code: 432 Highway Transportation - 602 Mechanical Drives and Transmissions - 705 Electric Generators and Motors - 723 Computer Software, Data Handling and Applications - 921 Mathematics
DOI: 10.6041/j.issn.1000-1298.2014.04.004
Database: Compendex
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