2008年第39卷第7期共收錄44篇
1. Accession number:083211445217
Title:Principal component analysis on taste quality of brown rice based on mechanical indexes of cooked rice grain
Authors:Zhang, Hongxia; Ma, Xiaoyu
Author affiliation:Heilongjiang August First Land Reclamation University, Daqing 163319, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 7
Issue date:July 2008
Publication year:2008
Pages:p 90-94
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract: On the basis of mechanical indexes of cooked rice grain, the taste quality of brown rice was evaluated by principal component analysis method. The main mechanical indexes of 7 varieties of cooked rice grain were determined from the specimen correlation matrix. According to more than 80.8% of the cumulative variance proportion, the two principal components were established for reflecting the taste quality of brown rice. Finally, the principal component values of varieties were obtained and the taste quality was analyzed. The results are similar to practical phenotypes, and it shows that the method of principal component analysis is more exact and feasible by the mechanical indexes of cooked rice grain.
Number of references:8
Ei main heading:Principal component analysis
Ei controlled terms:Financial data processing - Grain (agricultural product) - Quality control
Uncontrolled terms:Brown rice - Mechanical properties - Taste quality - Principal components - Cooked rice - Mechanical indexes - Correlation matrices
Ei classification codes:821.4 Agricultural Products - 911.1 Cost Accounting - 913.3 Quality Assurance and Control - 922.2 Mathematical Statistics
Database:Compendex
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2. Accession number:083211445218
Title:Experimental study on forced-air precooling of apples in bulk
Authors:Tan, Jingying; Yang, Zhao
Author affiliation:Tianjin University, Tianjin 300072, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 7
Issue date:July 2008
Publication year:2008
Pages:p 95-98
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract: The forced-air precooling experiments of apples were carried out to study the influences of temperature, relative humidity and velocity of the cold air, and the void ratio of apples on the precooling process. The results show that the optimum operation velocity for the apples cooling is 1.5 m/s. Well cooling effect of apples can be obtained with low temperature (4C, no chilling injury) and high humidity air (80% RH above) in air circulation. The void ratio of apples has little influence on the precooling time when the air velocity is greater than 1.5 m/s, and the increase of the void ratio will significantly reduce the precooling time when the air velocity is less than 0.75 m/s.
Number of references:5
Ei main heading:Cooling
Ei controlled terms:Atmospheric humidity - Atmospherics - Fruits - Health - Meteorology - Moisture - Silicones
Uncontrolled terms:Apples - Experiment - Forced-air precooling - Freezing - Technical parameter - Void ratio - Air velocities - Air pre cooling - Cooling effects - Air circulation - High humidity - Cold air - Chilling injury - Low temperature - Relative humidities - Experimental studies
Ei classification codes:443 Meteorology - 443.1 Atmospheric Properties - 461.6 Medicine and Pharmacology - 641.2 Heat Transfer - 815.1.1 Organic Polymers - 821.4 Agricultural Products
Database:Compendex
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3. Accession number:083211445216
Title:Analysis on the effect of extrusion on tannin content in rapeseed meal
Authors:Xiao, Zhigang; Wu, Moucheng; Shen, Dechao; Xiao, Rui
Author affiliation:Northeast Agricultural University, Harbin 150030, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 7
Issue date:July 2008
Publication year:2008
Pages:p 85-89
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract: Moisture of extruder feed material,heating temperature of extruder barrel and rotation speed of extruder screw were considered as factors;tannin content was employed as evaluation index. With the aid of the combination design of quadratic orthogonal rotation, the regression equation was established,the single factor and response surface methodology were used to demonstrate the influential rules of test factors to the index changes,and the contribution rate of factors to the index was investigated, the extruder condition of lower tannin content was fixed by the frequency analysis. The results show that the tannin content decreases to 50% when heating temperature of extruder barrel is 50擄C, rotation speed of extruder screw is 166 r/min and moisture of material is 25%.
Number of references:6
Ei main heading:Extruders
Ei controlled terms:Food processing - Frequency response - Heating - Moisture - Rotation - Speed
Uncontrolled terms:Extrusion - Orthogonal test - Rapeseed - Tannin - Tannin content - Heating temperatures - Rotation speeds - Combination design - Frequency analysis - Evaluation indexes - Contribution rate - Response surface methodologies - Regression equations - Quadratic orthogonal rotation - Feed materials
Ei classification codes:443.1 Atmospheric Properties - 535.2.1 Metal Forming Machines - 643.1 Space Heating - 703.1 Electric Networks - 822.2 Food Processing Operations - 931.1 Mechanics
Database:Compendex
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4. Accession number:083211445219
Title:Non-destructive test of Fuji apple's major components by CT
Authors:Zhang, Jingping; Zhang, Hua; Wang, Hui
Author affiliation:Zhejiang University, Hangzhou 310029, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 7
Issue date:July 2008
Publication year:2008
Pages:p 99-102
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract: With the aim to discuss the availability of CT(computerized tomography) non-destructive test (NDT) of Fuji apple's major components, a method based on X-ray CT was adopted to collect the CT information in Fuji apples. The CT information was used as the input of neural network to forecast the major components of Fuji apple. The results show that the average forecast errors of moisture content, sugar content and acid content are 1.75%, 5.81% and 0.72% respectively, and the precision of this method can meet the requirements of Fuji apples NDT.
Number of references:5
Ei main heading:Electric instrument transformers
Ei controlled terms:Computerized tomography - Diagnostic radiography - Forecasting - Imaging techniques - Medical imaging - Neural networks - Nondestructive examination - Sugar (sucrose) - Sugars - Testing - Tomography
Uncontrolled terms:Apple - Component - Neural network - Non-destructive test - Fuji apple - Forecast errors - Acid contents - Sugar contents - Moisture content - X-ray CT
Ei classification codes:421 Strength of Building Materials; Mechanical Properties - 422.2 Test Methods - 461.1 Biomedical Engineering - 461.7 Health Care - 714 Electronic Components and Tubes - 723.5 Computer Applications - 746 Imaging Techniques - 804.1 Organic Compounds - 822.3 Food Products - 912.2 Management
Database:Compendex
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5. Accession number:083211445220
Title:Optimization of extraction process of soluble dietary fibre from oat bran
Authors:Liu, Huanyun; Li, Huili; Zhao, Hong
Author affiliation:Hebei Economics and Trade University, Shijiazhuang 050061, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 7
Issue date:July 2008
Publication year:2008
Pages:p 103-106
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract: To extract the soluble dietary fibre from oat bran, the effects of different pretreatment methods, the ratio of raw material to extraction solvent, temperature and the time on the yield of soluble dietary fibre, were studied respectively. The optimum extraction process was determined using the single factor and orthogonal experiments. The experimental results show that the optimum extraction process is as follows: when the extraction temperature 65C and pH 6.5, entering 偽-starch enzyme into the solvent with the ratio of extraction solvent to raw material 9 mL; then changing pH to 9.0 for extraction of 2 hours; isoelectric precipitating the protein, and precipitating the water-soluble dietary fibre with ethanol for 9 hours. Under this optimum extraction process, the yield and purity of soluble dietary fibre are 12.40% and 78.56% respectively.
Number of references:8
Ei main heading:Extraction
Ei controlled terms:Ethanol - Fibers - Food additives - Organic solvents - Raw materials - Solvent extraction - Solvents
Uncontrolled terms:Food technology - Oat bran - Soluble dietary fibre - Extraction processing - Orthogonal experiments - Isoelectric - Extraction temperatures - Pre-treatment methods
Ei classification codes:802.3 Chemical Operations - 803 Chemical Agents and Basic Industrial Chemicals - 804.1 Organic Compounds - 812 Ceramics, Refractories and Glass - 822.3 Food Products - 951 Materials Science
Database:Compendex
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6. Accession number:083211445221
Title:Progress on detecting technique and sorter of raw cotton foreign matters
Authors:Guo, Junxian; Ying, Yibin
Author affiliation:Zhejiang University, Hangzhou 310029, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 7
Issue date:July 2008
Publication year:2008
Pages:p 107-113 106
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract: The foreign matters of raw cotton seriously affect the cotton grade and the quality of the final woven product. Detecting and eliminating of the foreign materials from raw cotton is difficult during the spinning operations. Many researchers have applied different techniques to identify various contaminations of raw cotton based on their characteristics of geometry, physics and spectroscopy. These techniques are machine vision at visible light wave, infrared spectroscopy, X-ray micro-tomographic image, and so on. Different kinds of sorter have been developed since the 1950s. For improving the detection accuracy of different foreign matters in complicated condition, the techniques of real-time infrared spectroscopy, multispectral and hyperspectral imaging will be
adopted gradually.
Number of references:33
Ei main heading:Infrared spectroscopy
Ei controlled terms:Agricultural products - Atmospherics - Computer vision - Cotton - Imaging techniques - Spectroscopic analysis - Spectrum analysis - Spinning (fibers) - Textile industry
Uncontrolled terms:Detecting technique - Foreign matter - Progress - Raw cotton - Sorter - Machine vision - Visible-light - Tomographic - Detection accuracy - Real-time infrared spectroscopy - Multi-spectral - Hyper-spectral imaging - Foreign materials
Ei classification codes:443.1 Atmospheric Properties - 741.2 Vision - 746 Imaging Techniques - 801 Chemistry - 819.3 Fiber Chemistry and Processing - 819.6 Textile Mills, Machinery and Equipment - 821.4 Agricultural Products - 921 Mathematics - 941.4 Optical Variables Measurements
Database:Compendex
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7. Accession number:083211445222
Title:Automated guided vehicle self-adaptive variable structure control based on genetic algorithm
Authors:Jiao, Jun; Chen, Wuwei; Wang, Jixian; Wang, Tanbin
Author affiliation:Hefei University of Technology, Hefei 230009, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 7
Issue date:July 2008
Publication year:2008
Pages:p 114-118
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract:In order to advance automated guided vehicle(AGV) control, a variable structure AGV control method based on genetic algorithm(GA) was proposed. Parameters, which were determined
previously in the conventional reaching law, were regulated adaptively by GA. It is shown that all advantages of conventional reaching law are retained, meanwhile the control features of the control system are improved effectively. System can move perfectly on the sliding-mode surface. Theoretic analysis and experiment results prove the validity of the method.
Number of references:11
Ei main heading:Genetic engineering
Ei controlled terms:Adaptive algorithms - Algorithms - Bioelectric phenomena - Genetic algorithms - Vehicles
Uncontrolled terms:Automated guided vehicle - Discrete reaching law - Genetic algorithm - Self-adapting - Variable structure control - Reaching law - Genetic Algorithm (GA) - Control methods - Control features - Variable structures - Self-adaptive
Ei classification codes:432 Highway Transportation - 461.1 Biomedical Engineering - 461.8.1 Genetic Engineering - 723 Computer Software, Data Handling and Applications
Database:Compendex
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8. Accession number:083211445223
Title:Multiple areas and multiple structures method of image edge detection for the Long Wing Laodelphax Striatellus (Fallen)
Authors:Qiu, Baijing; Cheng, Qiwen; Chen, Guoping; Yao, Kebing; Chen, Shuren
Author affiliation:Jiangsu University, Zhenjiang 212013, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 7
Issue date:July 2008
Publication year:2008
Pages:p 119-123
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract: When the four conventional edge detection methods such as the Sobel are applied to detect the multiple-structure edges of the Long Wing Laodelphax Striatellus (Fallen) image including the wing and the claw, it will be influenced by the pixels noise and the edge will not be clear. Also the morphology of erode single element edge detection method are adopted and the result is not ideal, as the breakpoints is 10 and the minimum loss rate of the pixels is 0.689%. In order to improve the ability for detecting the edge, the image was divided into several areas due to the multi-edges so that the edge detection in every area was simplified. Subsequently, the erode with dilate edge detecting operators was constructed, which could be used to detect the different edges in every areas. The results indicate that the multi-areas combined with morphology multi-structures method for detecting the Long Wing Laodelphax Striatellus (Fallen) edge is better, and the breakpoints is 3 and the minimum loss rate of the pixels is 0.554%.
Number of references:13
Ei main heading:Edge detection
Ei controlled terms:Image segmentation - Pixels - Signal detection
Uncontrolled terms:Long Wing Laodelphax Striatellus (Fallen) - Multiple areas - Multiple structures - Break-points - Loss rates - Edge detection methods - Single element - Image edge detection
Ei classification codes:716 Telecommunication; Radar, Radio and Television - 716.1 Information Theory and Signal Processing - 722.2 Computer Peripheral Equipment - 723.2 Data Processing and Image Processing
Database:Compendex
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9. Accession number:083211445224
Title:Rough sets weights application in the extension classification of the stored-grain pests based on fuzzy C-means discretization
Authors:Zhang, Hongtao; Mao, Hanping
Author affiliation:Jiangsu University, Zhenjiang 212013, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 7
Issue date:July 2008
Publication year:2008
Pages:p 124-128
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract: The recognition of the stored-grain pests is a multi-feature and multi-compound degree classification of various pests. It is very important to determine the objective weights of features automatically in the classification of the stored-grain pests based on extension theory. The self-adapting assessment function of the number of the clustering, clustering analysis using the FCM, and discrete process of the real features based on the maximum degree of membership were put forward. Subsequently, the degree of the importance for attributes from rough sets theory was introduced and the objective weights of features for the stored-grain pests were determined automatically. Finally, the familiar nine categories of the stored-grain pests in grain-depot were recognized by a classifier based on the extension decision theory. The results show that the correct identification ratio is 93% and the rough sets weights application in the extension classification of the stored-grain pests is feasible.
Number of references:15
Ei main heading:Set theory
Ei controlled terms:Administrative data processing - Arsenic compounds - Chlorine compounds - Classification (of information) - Decision making - Decision support systems - Decision theory - Flow of solids - Fuzzy clustering - Fuzzy sets - Fuzzy
systems - Game theory - Grain (agricultural product) - Management information systems - Management science - Membership functions - Rough set theory
Uncontrolled terms:Extension analysis - Feature weight - Fuzzy C-means - Rough sets - Stored-grain pests - Discretization - Self-adapting - Clustering analysis - Maximum degree - Rough Sets theory - Extension theory
Ei classification codes:716.1 Information Theory and Signal Processing - 723 Computer Software, Data Handling and Applications - 723.2 Data Processing and Image Processing - 804.1 Organic Compounds - 821.4 Agricultural Products - 912.2 Management - 921 Mathematics - 921.4 Combinatorial Mathematics, Includes Graph Theory, Set Theory - 922.1 Probability Theory - 931.1 Mechanics - 961 Systems Science
Database:Compendex
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10. Accession number:083211445225
Title:Pearl shape recognition based on computer vision
Authors:Li, Ge; Li, Bin; Wang, Ying; Yu, Zhi; Li, Jing; Zhao, Huayong
Author affiliation:Zhejiang Sci.-Technol. University, Hangzhou 310018, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 7
Issue date:July 2008
Publication year:2008
Pages:p 129-132
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract: Shape classification is an important step to pearl classification. After a series of preprocessing, the pearl image obtained by computer vision was transformed to the polar coordinates, and then eight F(h) (Fourier coefficient) values was computed as each kind of typical shape characteristic parameters. Subsequently the utilization of fuzzy pattern recognition method realized the shape effective distinction of each pearl image. Finally, the pearl shape distinction classification was realized by seeking and comparison of characteristics image through multi-angles of view. The experimental results indicate that the largest error judgments rate of the proposed distinction method is 33.3%.
Number of references:12
Ei main heading:Gems
Ei controlled terms:Artificial intelligence - Classification (of information) - Computer vision - Feature extraction - Image processing - Pattern recognition
Uncontrolled terms:Fourier transform - Fuzzy pattern recognition - Pearl - Shape classification - Fourier coefficients - Characteristic parameters - Polar coordinates - Shape distinction - Shape recognition
Ei classification codes:482.2.1 Gems - 716 Telecommunication; Radar, Radio and Television - 716.1 Information Theory and Signal Processing - 723.4 Artificial Intelligence - 741 Light, Optics and Optical Devices - 741.2 Vision
Database:Compendex
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11. Accession number:083211445226
Title:Product information model oriented to KBE
Authors:Jiang, Weiguang; Wu, Jianwei; Pan, Shuangxia; Guo, Feng
Author affiliation:Zhejiang University, Hangzhou 310027, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 7
Issue date:July 2008
Publication year:2008
Pages:p 133-138
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract: To meet the requirements for knowledge in product design process, a product information model based on KBE was presented. Using knowledge representation framework based on KBE, the model was established by object-oriented method and supported mixed knowledge representation. With classification and representation of knowledge based on attribute, constraint and operation, a PIM main framework which described classification and composition mechanism was modeled by UML. Shock absorber expert system was established based on this model to merge engineering knowledge and support information integration of product lifecycle.
Number of references:5
Ei main heading:Knowledge representation
Ei controlled terms:Administrative data processing - Artificial intelligence - Automobile parts and equipment - Automobile shock absorbers - Classification (of information) - Decision support systems - Expert systems - Information theory - Knowledge based systems - Knowledge engineering - Management information systems - Process design - Process engineering - Product design - Technology - Unified Modeling Language
Uncontrolled terms:KBE - Object-oriented method - Product information model - Product information - Engineering knowledge - Knowledge based - Product life cycles - Information integration - Object-oriented - Product design process
Ei classification codes:662.4 Automobile and Smaller Vehicle Components - 716.1 Information Theory and Signal Processing - 723 Computer Software, Data Handling and Applications - 723.1.1 Computer Programming Languages - 723.2 Data Processing and Image Processing - 723.4 Artificial Intelligence - 723.4.1 Expert Systems - 901 Engineering Profession - 912.1 Industrial Engineering - 913.1 Production Engineering
Database:Compendex
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12. Accession number:083211445227
Title:Reliability-based robust design for kinematic accuracy of the planar linkage mechanism with arbitrary distribution parameters
Authors:Zhang, Yimin; Huang, Xianzhen; He, Xiangdong
Author affiliation:Northeastern University, Shenyang 110004, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 7
Issue date:July 2008
Publication year:2008
Pages:p 139-143
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract: By combining the reliability-based optimization design theory, the reliability sensitivity technique and the robust design method, the reliability-based robust design for kinematic accuracy
of the planar linkage mechanism with arbitrary distribution parameters was discussed extensively. Subsequently, a numerical method for reliability-based robust design was proposed. Under the condition that the first four moments of basic random parameters are available, computer programs based on this model can be used to complete the reliability-based robust design for kinematic accuracy of planar linkage mechanism accurately and quickly.
Number of references:12
Ei main heading:Machine design
Ei controlled terms:BASIC (programming language) - Kinematics - Mechanisms - Numerical methods - Product design - Reliability theory - Reliability
Uncontrolled terms:Kinematic accuracy - Linkage mechanism - Robust design - Reliability-based robust design - Planar linkages - Arbitrary distribution parameters - Computer programs - Robust designs - Random parameters - Reliability sensitivity - Reliability based-optimization
Ei classification codes:421 Strength of Building Materials; Mechanical Properties - 601 Mechanical Design - 601.3 Mechanisms - 723.1.1 Computer Programming Languages - 913.1 Production Engineering - 921.6 Numerical Methods - 922.2 Mathematical Statistics - 931.1 Mechanics
Database:Compendex
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13. Accession number:083211445228
Title:Analysis on position and workspace of 4-PTT parallel mechanism
Authors:Guo, Zonghe; Duan, Jianguo; Hao, Xiuqing; Sun, Lei
Author affiliation:Shandong University of Technology, Zibo 255049, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 7
Issue date:July 2008
Publication year:2008
Pages:p 144-148 138
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract:An original 4-PTT parallel mechanism with three-dimensional translations and rotational motion about Z axis was presented. Its positional inverse expressions were established using the conversion of coordinates and projection in analytic geometry, and the method of the forward solution of the mechanism and corresponding numerical examples were given. Subsequently, the workspace of standing pose was analyzed by programming with Matlab and LabVIEW. The analytical results indicate that the workspace of the 4-PTT parallel mechanism has advantages of smooth boundary, big volume, no cavity and regular cross section in the fields of industrial robots, micromanipulators, virtual axis machine tools, damping platform, rehabilitation robot and etc.
Number of references:8
Ei main heading:Mechanisms
Ei controlled terms:Industrial robots - MATLAB - Machine tools - Robotics - Three dimensional
Uncontrolled terms:Parallel mechanism - Position analysis - Workspace - Numerical examples - Lab VIEW - Analytic geometry - Analytical results - Smooth boundary - Cross sectioning - Rotational motions - Rehabilitation robots - Three-dimensional translations
Ei classification codes:601.3 Mechanisms - 603.1 Machine Tools, General - 723.5 Computer Applications - 731.5 Robotics - 731.6 Robot Applications
Database:Compendex
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14. Accession number:083211445229
Title:Double ant colony algorithm in concave obstacle environment for global path planning
Authors:Sun, Chunzhe; Lin, Juguang; Lou, Ganfei; Wang, Shuwang
Author affiliation:Hefei University of Technology, Hefei 230009, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 7
Issue date:July 2008
Publication year:2008
Pages:p 149-153
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract: In order to solve the problems for path planning in concave obstacle environment, an double ant colony algorithm was completed using computer simulation technology. Combining the thought of MAX-MIN ant colony algorithm and adding new type heuristic gene based on distance change, we founded a complete cross double ant colony algorithm and applied it to robot path planning. Even when there are lots of concave obstacles in the robot environment, the algorithm still can get a high quality path and is suitable for robot path planning. The simulation results show that the best path rate obtained by the double ant colony algorithm is 98%.
Number of references:8
Ei main heading:Global optimization
Ei controlled terms:Algorithms - Computational methods - Computer simulation - Heuristic algorithms - Heuristic programming - Robotics - Robots
Uncontrolled terms:Concave obstacle - Double ant colony algorithm - Global path planning - Heuristic gene - Ant colony algorithm - Robot path planning - Max-min - Path planning - High-quality - Robot environment - Simulation results - Computer simulation technology
Ei classification codes:721.1 Computer Theory, Includes Formal Logic, Automata Theory, Switching Theory, Programming Theory - 723 Computer Software, Data Handling and Applications - 723.1 Computer Programming - 723.5 Computer Applications - 731.5 Robotics - 921.5 Optimization Techniques
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15. Accession number:083211445230
Title:Optimization empty run for CNC multi-contour processing
Authors:Ji, Guoshun; Wang, Wen; Chen, Zichen
Author affiliation:Zhejiang University, Hangzhou 310027, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 7
Issue date:July 2008
Publication year:2008
Pages:p 154-158 172
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract:Multi-contour processing empty run optimization was regarded as generalized salesman problem. A novel algorithm based on ant colony system optimization and nearest neighbor rule was
proposed. Ant colony algorithm was applied to a selected cutting path arbitrarily, an optimal contour sequence was found, with nearest neighbor rule, nodes on each adjacent contour were obtained to construct a cutting path. A new cutting path was built with ant colony optimization algorithm and nearest neighbor rule based on this constructed path. An optimal cutting path was constructed through several iterations in this way. A multi-contour processing instance was given and the results of it indicated a reasonable cutting path could be gained with this algorithm effectively. With single factor analysis and uniform design, the method of how to select optimization parameters was given.
Number of references:14
Ei main heading:Optimization
Ei controlled terms:Cutting - Global optimization - Laws and legislation
Uncontrolled terms:Ant colony algorithm - Multi-contour processing - NC programming - Nearest neighbor rule - Path optimization - Ant colony system - Optimization parameters - Ant Colony Optimization algorithms - Optimal cutting - Factor analysis - Uniform Design - Novel algorithms - Salesman problem
Ei classification codes:604.1 Metal Cutting - 921.5 Optimization Techniques - 971 Social Sciences
Database:Compendex
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16. Accession number:083211445231
Title:Double-voltage control mode of electro-pneumatic proportional pressure valve with high voltage driving and low voltage PWM
Authors:Liu, Zhizhen; Zhang, Zhongxiang; Hou, Yanjin
Author affiliation:Shandong University, Ji'nan 250061, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 7
Issue date:July 2008
Publication year:2008
Pages:p 159-163
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract: With the aim to insure the better linear degree of electro-pneumatic proportional valve and raise the response speed of its speed on-off valves, a doubled-voltage control mode with high voltage driving and low voltage PWM was proposed. In the mode, the high voltage (24 V) could shorten the open time, and the low voltage PWM (6 V) could reduce the power loss and shorten the closing time according to the pulse width controlled by PID. An electro-pneumatic proportional pressure valve controlled by a MCU ATmega8L was designed based on the mode. The tested results show that, using the mode of high voltage driving and low voltage PWM, the open time of the high speed on-off valve is reduced to 0.8 ms, the turnoff time is 0.3 ms, and the total power consumption is 2.18 W.
Number of references:12
Ei main heading:Valves (mechanical)
Ei controlled terms:Counting circuits - DC generators - Electric potential - Fluid mechanics - Pneumatics - Pressure relief valves - Pulse modulation - Pulse width modulation - Raise driving - Speed - Voltage control - Voltage regulators
Uncontrolled terms:Doubled-voltage control mode - Electro-pneumatic proportional pressure valve - High speed on-off valve - Low voltages - High voltages - Electro-pneumatic - Control modes - Proportional pressure valve - Pulse width - Power losses - Total power consumption - Turn-off time - Response speed - Proportional valves
Ei classification codes:502.1 Mine and Quarry Operations - 601.2 Machine Components - 632.3 Pneumatics - 701.1 Electricity: Basic Concepts and Phenomena - 705.2.2 DC Generators - 713.4 Pulse Circuits - 716 Telecommunication; Radar, Radio and Television -
731.3 Specific Variables Control - 732.1 Control Equipment - 931.1 Mechanics
Database:Compendex
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17. Accession number:083211445232
Title:Simulation and characteristic analysis of hydraulic bumper
Authors:Zhang, Wenbin; Zhou, Xiaojun
Author affiliation:Zhejiang University, Hangzhou 310027, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 7
Issue date:July 2008
Publication year:2008
Pages:p 164-168
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract: By studying the performance principle of the hydraulic bumper, the overall characteristic model and the dynamic buffering process model of hydraulic bumper were built based on speciality
analysis of its thin wall-orifice flow and spherical surface-slit flow. Then the curve of buffering force and piston distance, which expresses bumper characteristic, was obtained by simulation. The
results show that the static characteristic of the hydraulic bumper is only determined by the first characteristic of thin wall-orifice and the second characteristic of spherical surface-slit, and the dynamic characteristic is mainly related to the magnitude of shocking and the compressibility of oil.
Number of references:11
Ei main heading:Fluid mechanics
Ei controlled terms:Elastic moduli - Hydraulics - Orifices - Thin walled structures - Walls (structural partitions)
Uncontrolled terms:Dynamic characteristic - Hydraulic bumper - Mathematical model - Simulation - Spherical surfaces - Thin walls - Orifice flows - Dynamic buffering - Static characteristics - Buffering force - Process modelling - Characteristic model - Dynamic characteristics - Characteristic analysis
Ei classification codes:408 Structural Design - 408.2 Structural Members and Shapes - 619.1 Pipe, Piping and Pipelines - 632.1 Hydraulics - 931.1 Mechanics - 951 Materials Science
Database:Compendex
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18. Accession number:083211445233
Title:Sliding mode control of induction motor servo system via fuzzy neural network
Authors:Wang, Ruiming; Liu, Qingsong; Jiang, Jingping
Author affiliation:Jiaxing College, Jiaxing 314001, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 7
Issue date:July 2008
Publication year:2008
Pages:p 169-172
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract: Considering the requirement of high performance of induction motor servo drive system, a sliding mode controller of induction motor drive system was developed based on fuzzy neural network. As the control system was in a state of hyper-plane sliding, the index of sliding mode control fluttering was investigated and input into the learning algorithm. Subsequently, the output of fuzzy neural network would be adjusted to reduce the fluttering. The analysis and the proposed method were verified by simulation and experiment. The results show that the simulation results agree well with the test results, the fluttering is reduced evidently, and the design of the sliding mode controller is rational.
Number of references:4
Ei main heading:Induction motors
Ei controlled terms:AC motors - Electric drives - Flight control systems - Fuzzy control - Fuzzy neural networks - Image classification - Learning algorithms - Learning systems - Motors - Neural networks - Sliding mode control
Uncontrolled terms:Fluttering - Fuzzy neural network - Servo system - Sliding mode controller - Sliding-mode controllers - Test results - Induction motor drive systems - Simulation results - Hyper planes - Servo-drive systems - Servo systems
Ei classification codes:461.1 Biomedical Engineering - 461.4 Ergonomics and Human Factors Engineering - 632.2 Hydraulic Equipment and Machinery - 652.3 Aircraft Instruments and Equipment - 705 Electric Generators and Motors - 705.3.1 AC Motors - 716 Telecommunication; Radar, Radio and Television - 723 Computer Software, Data Handling and Applications - 723.4 Artificial Intelligence - 731 Automatic Control Principles and Applications - 731.1 Control Systems
Database:Compendex
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19. Accession number:083211445234
Title:Acoustic radiation sensitivity analysis of semi-free field
Authors:Gao, Yu; Cheng, Hao; Chen, Jian
Author affiliation:Hefei University of Technology, Hefei 230009, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 7
Issue date:July 2008
Publication year:2008
Pages:p 173-177
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract: The semi-free field wave superposition method and the free field wave superposition method were utilized to calculate the acoustic sensitivity in the semi-free acoustic field. The simulated results show that the magnitudes and the change of the sensitivity by free field wave superposition method and the theoretical ones are widely divergent; but the results by semi-free field wave superposition method are consistent with the theoretical ones; the computing errors of the pulsating sphere source and the oscillating sphere source are 3.85% and 3.78% respectively.
Number of references:15
Ei main heading:Sensitivity analysis
Ei controlled terms:Acoustic fields - Acoustic waves - Acoustics - Computational methods - Fluid structure interaction - Ketones - Spheres
Uncontrolled terms:Acoustic radiation - Semi-free acoustic field - Wave superposition - Free fields - Wave superposition method - Pulsating sphere - Simulated results - Oscillating spheres - Acoustic radiations
Ei classification codes:631 Fluid Flow - 631.1 Fluid Flow, General - 721.1 Computer Theory, Includes Formal Logic, Automata Theory, Switching Theory, Programming Theory - 751 Acoustics, Noise. Sound - 751.1 Acoustic Waves - 804.1 Organic Compounds - 921 Mathematics
Database:Compendex
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20. Accession number:083211445235
Title:Analysis of beam structure vibration by boundary element method
Authors:Han, Xuzhao; Huang, Yumei; Zhang, Yonggui; Cai, Xiaojiang
Author affiliation:Xi'an University of Technology, Xi'an 710048, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 7
Issue date:July 2008
Publication year:2008
Pages:p 178-182 193
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract: The vibration of beam structures has an important impact on the application of engineering. Taking the bending vibration of the beam element as a case and embarking upon the control differential equations of it, this paper deduced the analysis formulas of the bending vibration of the beam element by boundary element method (BEM), proposed local-interval-step-thinning frequency scanning method, completed the BEM dynamic analysis program of the beam element by Matlab software, and eventually provided the corresponding examples of dynamic analysis of the beam element. The results indicate that BEM is convenient for dynamic analysis of beam structures. Compared with the conventional scanning method, the local-interval-step-thinning frequency scanning method has higher efficiency and accuracy.
Number of references:13
Ei main heading:Boundary element method
Ei controlled terms:Bending (deformation) - Concurrency control - Difference equations - Differential equations - Differentiation (calculus) - Dynamic analysis - Lattice vibrations - MATLAB - Numerical analysis - Optical engineering - Scanning - Technology - Vibrations (mechanical)
Uncontrolled terms:Beam structure - Dynamic characteristics - Frequency scanning - Vibration analysis - Beam elements - Beam structures - Bending vibrations - Scanning methods - Matlab- software - Boundary element method (BEM) - Boundary elements
Ei classification codes:421 Strength of Building Materials; Mechanical Properties - 422.2 Test Methods - 723.3 Database Systems - 723.5 Computer Applications - 741 Light, Optics and Optical Devices - 741.3 Optical Devices and Systems - 901 Engineering Profession - 921.2 Calculus - 921.6 Numerical Methods - 931.1 Mechanics - 933.1.1 Crystal Lattice
Database:Compendex
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21. Accession number:083211445236
Title:H infinity active control of structure vibration based on time radiation modes
Authors:Song, Liyan; Jiang, Zhe
Author affiliation:Jiangsu University, Zhenjiang 212013, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 7
Issue date:July 2008
Publication year:2008
Pages:p 183-187
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract: Based on time radiation modes, using the first several acoustic radiation adjoint coefficients to minimize the acoustic power from vibrating structure, is a new strategy in active control. State space equations from the structure vibration system with disturbing forces and controlling forces were presented. Using several point force actuators as control sources, the control model based on time adjoint coefficients was built via H infinity control theory. Taking a baffled rectangular plate as an example, the model was studied using one and two controlling forces respectively, and the effect of active control was discussed. Finally, the simulation results indicate that the acoustic power decreases obviously via H infinity control strategy, which effectively make the active control strategy based on radiation modes come true. Besides, the radiated power decreases more with more controlling forces, and it is demonstrated that using M controlling forces can counteract the first M radiated power.
Number of references:9
Ei main heading:Equations of state
Ei controlled terms:Acoustics - Control system analysis - Control theory - State space methods
Uncontrolled terms:Adjoint coefficient - Radiation modes - Time domain - Vibration controlling - Adjoint - On time - Vibrating structures - New strategy - Acoustic radiations - Structure vibrations - State-space equations - Disturbing forces - Point force actuators - Control modeling - Active controls - Acoustic powers
Ei classification codes:731.1 Control Systems - 751 Acoustics, Noise. Sound - 921 Mathematics - 931.2 Physical Properties of Gases, Liquids and Solids
Database:Compendex
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22. Accession number:083211445237
Title:Comparison on timefrequency analysis methods for nonstationary rotor vibration signal processing
Authors:Xiong, Guoliang; Zhang, Long
Author affiliation:East China Jiaotong University, Nanchang 330013, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 7
Issue date:July 2008
Publication year:2008
Pages:p 188-193
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract: Several timefrequency representations including time varying autoregressive model (TVAR), short time Fourier transform (STFT), WignerVille distribution (WVD), ChoiWilliams distribution (CWD), continuous wavelet transform (CWT) and HilbertHuang transform (HHT) were compared to the respect of their achievable time and frequency resolution, cross-term suppression and computational load. Those methods were taken to analyze an AMFM signal simulating the vibration of a running-up rotor. Comparing the results, it could be concluded that TVAR with the best comprehensive performance to such kind of signal. Consequently, TVAR was applied to process a real running-up vibration signal of a rotor with STFT as a benchmark. The result showes TVAR has potential to process nonstationary signals with superior feature extraction ability, and is fairly noise insensitive. In conclusion, TVAR provides a superior approach for timefrequency analysis and fault diagnosis of rotation machine under nonstationary conditions.
Number of references:17
Ei main heading:Fourier transforms
Ei controlled terms:Electric fault currents - Feature extraction - Lattice vibrations - Machine vibrations - Regression analysis - Signal processing - Vibrations (mechanical) - Wavelet transforms
Uncontrolled terms:Fault diagnosis - Method comparison - Nonstationary signal - Timefrequency analysis - Vibration signals - Non-stationary signals - Continuous wavelet transform - Wigner-ville distribution - Comprehensive performance - Short-time Fourier Transform - Computational loads - Non-stationary conditions - Extraction ability - Frequency resolutions - Time varying autoregressive model - Non-stationary
Ei classification codes:601.3 Mechanisms - 701.1 Electricity: Basic Concepts and Phenomena - 716 Telecommunication; Radar, Radio and Television - 716.1 Information Theory and Signal Processing - 921.3 Mathematical Transformations - 922.2 Mathematical Statistics - 931.1 Mechanics - 933.1.1 Crystal Lattice
Database:Compendex
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23. Accession number:083211445238
Title:Identification of vehicle pass-by noise sources based on wavelet coherence
Authors:Jia, Jide; Chen, Jian; Wang, Shiwu
Author affiliation:Bengbu Automobile Management Institute, Bengbu 233011, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 7
Issue date:July 2008
Publication year:2008
Pages:p 194-196 210
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract: Pass-by noise signal is nonstationary and time variant. It is difficult to identify sound sources accurately by the traditional FFT method. A noise sources identification technique was developed by the Morlet wavelet transforms (MWT). Applying the method to view the correlation between the standard measuring point noise and near field noises of the engine compartment, we obtained the cross wavelet transform and wavelet coherence for examining relationships in time frequency space between two time series. The contrast between MWT and FFT methods demonstrates that the MWT method can better identify noise correlation under the condition of low
signal-to-noise ratio (SNR) levels and short time spans.
Number of references:8
Ei main heading:Wavelet transforms
Ei controlled terms:Acoustic intensity - Acoustic noise - Coherent light - Correlation methods - Fast Fourier transforms - Mathematical transformations - Signal to noise ratio - Standards - Time series analysis
Uncontrolled terms:Coherent estimation - MWT - Noise identification - Nonstationary signal - Pass-by noise - FFT method - Sound sources - Time-frequency space - Noise sources identification - Near fields - Short time - Engine compartments - Morlet wavelets - Time-series - Noise correlations - Low signal-to-noise ratio - Time-variant - Non-stationary
Ei classification codes:716.1 Information Theory and Signal Processing - 741.1 Light/Optics - 751.2 Acoustic Properties of Materials - 751.4 Acoustic Noise - 902.2 Codes and Standards - 921.3 Mathematical Transformations - 922.2 Mathematical Statistics
Database:Compendex
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24. Accession number:083211445239
Title:Signal processing of dynamic weighing by wavelet transform
Authors:Zhang, Xiliang; Yang, Weiling; Li, Pingping; Zhang, Shiqing
Author affiliation:Jiangsu University, Zhenjiang 212013, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 7
Issue date:July 2008
Publication year:2008
Pages:p 197-200
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract: Aimed at the requirement of quick and accurate dynamic weighing, combining the characteristic of digital filter about wavelet, applying fast Mallat decomposing and constructing algorithm, a new signal processing method of dynamic weighing by discrete wavelet transform was discussed. The results of quantitative feeding dynamic weighing show that the stable time of the constructed low frequency parts is 0.128 s after wavelet decomposing wiped off high frequency parts. The error of signal construction is -1.5%-2%. The signal processing of dynamic weighing by wavelet transform can reflect the actual weight of material more quickly and more exactly than that by the Fourier transform.
Number of references:8
Ei main heading:Signal processing
Ei controlled terms:Discrete wavelet transforms - Electric fault currents - Fourier transforms - Mathematical transformations - Wavelet transforms - Weighing
Uncontrolled terms:Digital filtering - Wavelet transform - Dynamic weighing - High frequencies - Wavelet decomposing - Low frequencies - Fourier - Stable time
Ei classification codes:701.1 Electricity: Basic Concepts and Phenomena - 716.1 Information Theory and Signal Processing - 921.3 Mathematical Transformations - 943.3 Special Purpose
Instruments
Database:Compendex
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25. Accession number:083211445197
Title:Experimental study on spray characteristics of biodiesel
Authors:Yuan, Yinnan; Chen, Hanyu; Zhang, Chunfeng; Shi, Aiping
Author affiliation:Jiangsu University, Zhenjiang 212013, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 7
Issue date:July 2008
Publication year:2008
Pages:p 1-4
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract: Spray characteristics of biodiesel were investigated by using phase Doppler particle analyzer (PDPA) at different injection pressures, pump speeds and orifice diameters. Meanwhile, several high-speed digital pictures of spray for biodiesel and 0 type diesel were taken respectively. The experimental results show that Sauter mean diameter (SMD) of biodiesel spraying droplets decreases as the injection pressure increases and the orifice diameter diminishes, which is similar to petrochemical diesel. However, SMD of biodiesel spraying droplets changes slowly at different pump speeds.
Number of references:6
Ei main heading:Pesticides
Ei controlled terms:Alternative fuels - Biodiesel - Drop formation - Drops - Fluid mechanics - Orifices - Petrochemicals - Pumps - Speed - Spraying - Two phase flow Uncontrolled terms:Experiment - High-speed digital photography - Spray characteristics - Injection pressures - Orifice diameters - Petrochemical diesel - High speeds - Sauter Mean Diameter - Digital pictures - Phase-doppler-particle-analyzer -
Experimental studies
Ei classification codes:443.1 Atmospheric Properties - 513.3 Petroleum Products - 523 Liquid Fuels - 618.2 Pumps - 619.1 Pipe, Piping and Pipelines - 631.1 Fluid Flow, General - 803 Chemical Agents and Basic Industrial Chemicals - 813.1 Coating Techniques - 931.1 Mechanics - 931.2 Physical Properties of Gases, Liquids and Solids
Database:Compendex
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26. Accession number:083211445240
Title:Analysis on regression simulated roundness of wrapped bearing
Authors:Jiao, Minghua; Yu, Juntao; Yu, Jianwei; Xie, Ting; Liu, Kun
Author affiliation:Hefei University of Technology, Hefei 230009, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 7
Issue date:July 2008
Publication year:2008
Pages:p 201-203 207
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract: Aimed at the roundness evaluation, a regression analysis method evaluating the shape accuracy of the wrapped bearings was proposed. The analysis shows that the main influence parameters on the shape accuracy are thickness of powder and model clearance. Finally, the comparison test was carried out by a concrete example. The simulated results of the roundness are about consistent with the actual measurements and their discrepancy is only 0.025-0.057 mm.
Number of references:11
Ei main heading:Bearings (structural)
Ei controlled terms:Food processing - Regression analysis
Uncontrolled terms:Error analysis - Roundness - Simulation - Wrapped bearing - Influence parameters - Comparison testing - Simulated results - Analysis methods
Ei classification codes:401.1 Bridges - 822.2 Food Processing Operations - 922.2 Mathematical Statistics
Database:Compendex
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27. Accession number:083211445198
Title:Experiment on the influences of antiknock DMC and DIPE on gasoline engine combustion and emissions characteristics
Authors:Fang, Zejun; Ji, Changwei; Wang, Shuofeng; Yan, Hao
Author affiliation:Beijing University of Technology, Beijing 100022, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 7
Issue date:July 2008
Publication year:2008
Pages:p 5-8
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract: MTBE will pollute the groundwater, and it is urgent to find its alternatives. Dimethyl carbonate (DMC) and diisopropyl ether (DIPE) were selected as gasoline antiknocks, which added to 93 gasoline by 3% and 6% volume fraction respectively, and then their antiknock characteristics were studied by experiment. The effects of different volume fraction DMC and DIPE on gasoline engine fuel economy, combustion and emissions characteristics were obtained by measuring cylinder pressure, fuel consumption and emissions data through engine test-bed. The results show that DMC and DIPE lead to fuel consumption increasing 0.85% and 1.6% respectively at 3% volume fraction, and 3.7% and 1.3% respectively at 6% volume fraction. The peak value of cylinder pressure drop is decreased and the largest release heat point is postponed, especially at low loads. The HC emissions are lowered significantly and DMC reduces the Nox emissions.
Number of references:8
Ei main heading:Leakage (fluid)
Ei controlled terms:Air pollution - Combustion - Cylinders (shapes) - Engine cylinders - Ethers - Experiments - Fluid mechanics - Fuel economy - Gasoline - Groundwater - Hydrogeology - Liquid fuels - Organic compounds - Petroleum products - Smoke - Steel metallurgy - Thermochemistry - Titration - Volume fraction
Uncontrolled terms:DIPE - DMC - Emissions - Gasoline engine - Gasoline engines - Cylinder pressures - Engine test-bed - Peak values - Diisopropyl ether - HC emissions - Dimethyl carbonate
Ei classification codes:408.2 Structural Members and Shapes - 444.2 Groundwater - 451 Air Pollution - 451.1 Air Pollution Sources - 452.1 Sewage - 481.1 Geology - 513.3 Petroleum Products - 521.1 Fuel Combustion - 523 Liquid Fuels - 525.2 Energy Conservation - 531.1 Metallurgy - 612.1.1 Internal Combustion Engine Components - 641.1 Thermodynamics - 801 Chemistry - 804.1 Organic Compounds - 901.3 Engineering Research - 931.1 Mechanics
Database:Compendex
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28. Accession number:083211445199
Title:Influence factors of the lean operation limit for a spark ignition hydrogen enriched natural gas engine
Authors:Wang, Yu; Ma, Fanhua; Liu, Haiquan; Li, Yong
Author affiliation:Tsinghua University, Beijing 100084, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 7
Issue date:July 2008
Publication year:2008
Pages:p 9-13
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract: In order to extend the lean operation limit (LOL) of a spark ignition natural gas engine to further decrease its Nox emission, an experimental research was conducted to investigate the effect of hydrogen addition and various engine operating parameters on the LOL. The results show that hydrogen addition can significantly extend LOL and both the increase of engine load and intake air temperature result in greater (leaner) LOL. The effect of engine speed on LOL is not so straightforward. When fueled by pure CNG, LOL becomes greater with the increase of engine speed at low load, but while at high load, LOL drops if engine speed increases. However, when fuelled by hydrogen enrichment compressed natural gas (HCNG), engine speed has no obvious effect on LOL. Also an optimum spark advance to maximize LOL exists for a specific engine operating condition.
Number of references:11
Ei main heading:Gas engines
Ei controlled terms:Electric sparks - Gas industry - Gases - Hydrogen - Internal combustion engines - Natural gas - Nonmetals
Uncontrolled terms:Hydrogen volume fraction - Influence factors - Lean operation limit - Natural gas engine - Spark ignition - Natural gas engines Ei classification codes:522 Gas Fuels - 612.1 Internal Combustion Engines, General - 612.3 Gas Turbines and Engines - 701.1 Electricity: Basic Concepts and Phenomena - 804 Chemical Products Generally - 931.2 Physical Properties of Gases, Liquids and Solids
Database:Compendex
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29. Accession number:083211445200
Title:Performance tests on differential steering mechanism of tracked vehicle
Authors:Chi, Yuan; Jiang, Enchen
Author affiliation:Northeast Agricultural University, Harbin 150030, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 7
Issue date:July 2008
Publication year:2008
Pages:p 14-17
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract: A new differential steering mechanism adopting hydro-mechanical double power used in tracked vehicle was designed. The new differential steering mechanism is made up of three planetary systems. Combining the power of the derailleur and that of the turning hydraulic system, the mechanism realizes two tracks turning in reverse directions. The experimental results show that it has good heading performance and the yawing rate is 0.7%, which accords with national standard. Quickly turning is achieved while only turning power input. With the increasing of inputting rotate
speed, turning angle velocity is also increased. The neutral turning is realized and the minimum turning radius is 0.02 m as the tracks on both sides have different skids and slips.
Number of references:7
Ei main heading:Turning
Ei controlled terms:Astronomy - Automobile parts and equipment - Automobile steering equipment - Hydraulic equipment - Mechanisms - Standards - Steering - Vehicles
Uncontrolled terms:Differential steering mechanism - Performance test - Tracked vehicle - Differential steering - Tracked vehicles - Turning radius - Turning angles - Rotate speed - Power input - National standards - Hydraulic systems - Planetary systems - Hydro-mechanical - Performance testing
Ei classification codes:432 Highway Transportation - 601.3 Mechanisms - 604.2 Machining Operations - 632.2 Hydraulic Equipment and Machinery - 657.2 Extraterrestrial Physics and
Stellar Phenomena - 662.4 Automobile and Smaller Vehicle Components - 902.2 Codes and Standards
Database:Compendex
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30. Accession number:083211445201
Title:Predictive control of the eddy current dynamometer based on genetic algorithm
Authors:Cheng, Guangwei; Zhou, Zhili; Deng, Chu'nan; Xu, Liyou
Author affiliation:Luoyang Institute of Science and Technology, Luoyang 471073, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 7
Issue date:July 2008
Publication year:2008
Pages:p 18-22
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract: According to the response characteristics of the load torque to the external input voltage by the eddy current dynamometer, the dynamic matrix for predictive control of the eddy current dynamometer was established. The parameters of the dynamic matrix control (DMC) were tuned by adopting genetic algorithm. Based on the research of the mechanical characteristics of the eddy current dynamometer, the application of the dynamic matrix predictive control method on the eddy current dynamometer was studied subsequently. The simulation results show that the time-consuming of raising the turning torque from zero to 320 Nm is about 800 ms by using the DMC controller based on the genetic algorithm. The efficiency is improved by 60% and the torque error is 10 Nm under stability control.
Number of references:11
Ei main heading:Current voltage characteristics
Ei controlled terms:Algorithms - DC motors - Dynamic response - Dynamometers - Eddy currents - Genetic algorithms - Genetic engineering - Matrix algebra - Predictive control systems Uncontrolled terms:Dynamic characteristics - Dynamic matrix
control - Eddy current dynamometer - Genetic algorithm - Predictive control - Stability control - Simulation results - Mechanical characteristics - External input - Load torque - Response characteristics
Ei classification codes:408.1 Structural Design, General - 461.8.1 Genetic Engineering - 701.1 Electricity: Basic Concepts and Phenomena - 705.3.2 DC Motors - 723 Computer Software, Data Handling and Applications - 731.1 Control Systems - 921.1 Algebra - 943.1 Mechanical Instruments
Database:Compendex
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31. Accession number:083211445202
Title:Analysis and experiment on characteristics of electro-hydraulic inverse-proportional relief valve used in CVT
Authors:He, Ren; Wu, Haixiao; Zhang, Yong; Xia, Jingjing; Mou, Zhengming
Author affiliation:Jiangsu University, Zhenjiang 212013, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 7
Issue date:July 2008
Publication year:2008
Pages:p 23-26
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract: In order to understand the characteristics of the electro-hydraulic inverse-proportional relief valve used in the continuously variable transmission (CVT), a mathematical model with pressure and flux of the electro-hydraulic inverse-proportional relief valve was established. The model was analyzed and simulated, subsequently. The test-bed was designed and a test standard was put forward, and tests of static characteristics and dynamic characteristics of the electro-hydraulic inverse-proportional relief valve were carried out. The experimental results indicate that the performances of the static characteristics and dynamic characteristics of the electro-hydraulic inverse-proportional relief valve are excellent, and it can satisfy precision control of the CVT.
Number of references:8
Ei main heading:Inverse problems
Ei controlled terms:Elastic moduli - Fluid mechanics - Hydraulics - Mathematical models - Pressure relief valves - Standards - Testing - Variable speed transmissions - Vehicle
Transmissions
Uncontrolled terms:Continuously variable transmission - Experiment - Inverse-proportional relief valve - Mathematical model - Relief valve - Electro-hydraulic - Dynamic characteristics - Static characteristics - Precision control - Test standards - Test beds
Ei classification codes:422.2 Test Methods - 601.2 Machine Components - 602.2 Mechanical Transmissions - 632.1 Hydraulics - 902.2 Codes and Standards - 921 Mathematics - 931.1 Mechanics - 951 Materials Science
Database:Compendex
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32. Accession number:083211445203
Title:Influence of displacement servo system on dynamic behavior of hydro-mechanical transmission
Authors:Yuan, Shihua; Wei, Chao; Hu, Jibin
Author affiliation:Beijing Institute of Technology, Beijing 100081, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 7
Issue date:July 2008
Publication year:2008
Pages:p 27-31
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract: The mathematic models of displacement servo system and hydro-mechanical transmission were built respectively. Each characteristic was analyzed according to bode diagram and step-input response. The results of analysis and test showed that the band width of displacement servo system is small, so it works as low-pass filter and responds slowly, whereas the band width of hydro-transmission is larger, and it responds quickly with over control. The system of hydro-mechanical transmission connected with displacement servo system in series is influenced by displacement servo system, so its band width becomes smaller and damp becomes larger, which results in slower response speed and improved stability.
Number of references:3
Ei main heading:Control system analysis
Ei controlled terms:Bode diagrams - Control theory - Mathematical models - System stability - Transmissions
Uncontrolled terms:Continuously variable transmission - Displacement servo system - Dynamic behavior - Frequency characteristic - Hydro-mechanical transmission - Servo systems - Band width - Hydro-mechanical - Improved stability - Response speed - Low-pass filtering - Dynamic behaviors
Ei classification codes:602.2 Mechanical Transmissions - 731.1 Control Systems - 921 Mathematics - 961 Systems Science
Database:Compendex
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33. Accession number:083211445204
Title:Analysis of self-aligning torque from vehicle kingpin inclination
Authors:Chen, Shian; Qiu, Feng; He, Ren; Lu, Senlin
Author affiliation:Jiangsu University, Zhenjiang 212013, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 7
Issue date:July 2008
Publication year:2008
Pages:p 32-35
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract: A precise analytic expression of self-aligning torque from vehicle kingpin inclination was given. The relation equation of front axle elevation with steered wheel angle, kingpin inclination, caster and caster offset at wheel center was inferred according to spatial geometry. The potential energy increasing of load on front axle was up to power to overcome the self-aligning torque from
kingpin inclination when steered wheel angle was changed. The analytic expression of self-aligning torque with steered wheel angle, kingpin inclination, caster and caster offset at wheel center was got by calculating derivative of potential energy increasing of load on front axle by steered wheel angle. Finally, the elevation of front axle was tested when steered wheel angle was changed on an experimental vehicle. The results show that the testing data agrees well with the theoretical calculation results, and the analytic expression of self-aligning torque from kingpin inclination is correct and reliable.
Number of references:5
Ei main heading:Wheels
Ei controlled terms:Axles - Equipment testing - Potential energy - Torque - Vehicles - Well testing
Uncontrolled terms:Analysis - Kingpin inclination - Self-aligning torque - Vehicle - Front axle - Analytic expressions - Testing data - Experimental vehicles - Spatial
Geometry
Ei classification codes:432 Highway Transportation - 512.1.2 Development Operations - 601.2 Machine Components - 662.4 Automobile and Smaller Vehicle Components - 931.1 Mechanics - 931.2 Physical Properties of Gases, Liquids and Solids - 941 Acoustical and Optical Measuring Instruments
Database:Compendex
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34. Accession number:083211445205
Title:Modeling and control strategy of assist characteristic of recirculating-ball EPS system for bus
Authors:Jin, Bingying; Lin, Yi; Shi, Guobiao
Author affiliation:Beijing Institute of Technology, Beijing 100081, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 7
Issue date:July 2008
Publication year:2008
Pages:p 36-41
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract: The mathematical model of primary modules of recirculating-ball electric power steering system for bus was built. The simulation model of the EPS system was constructed based on Matlab/Simulink. The control strategy of assist characteristic, which includes proportional and differential control of the torque transducer output signal and the assist motor angular velocity feedback, was purposed subsequently. The damp of EPS system can be changed with the demand, so the steering wheel shimmy is decreased, and the controllability and stability of steering system are both given attention during vehicle running. Adaptive fuzzy PID is adopted as the control strategy of motor current loop. The simulation results demonstrate that the assist characteristic algorithm proposed is effective in improving the dynamic performances of steering system.
Number of references:8
Ei main heading:Steering
Ei controlled terms:Automobile parts and equipment - Automobile steering equipment - Buses - Fuzzy control - Industrial economics - Mathematical models - Motors - System stability
Uncontrolled terms:Assist characteristic - Control strategy - Electric power steering - Mathematical model - EPS system - Control strategies - Steering systems - Adaptive fuzzy - MATLAB /simulink - Electric power steering system - Steering wheel shimmy - Angular velocity feedback - Output signals - Simulation results - Motor currents - Differential control - Dynamic performances - Simulation modelling - Modeling and control
Ei classification codes:632.2 Hydraulic Equipment and Machinery - 662.4 Automobile and Smaller Vehicle Components - 663.1 Heavy Duty Motor Vehicles - 731 Automatic Control Principles and Applications - 911.2 Industrial Economics - 921 Mathematics - 961 Systems Science
Database:Compendex
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35. Accession number:083211445206
Title:Monitoring platform of integrated multi-energy management system for PHEV
Authors:Zhang, Tong; Zhu, Lei; Wang, Cunlei; Yuan, Yinnan
Author affiliation:Jiangsu University, Zhenjiang 212013, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 7
Issue date:July 2008
Publication year:2008
Pages:p 42-46 55
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract: The vehicle and engine electrical unit in former PHEV (parallel hybrid electrical vehicle) CAN network was integrated into multi-energy management system (MMS), and the number of CAN nodes was changed from three to two. The MMS and ISG (integrated starter generator) controller were linked by CAN bus. PC was also linked to CAN bus by CAN interface card, which could get the real-time parameters of every controller and modify the inner data of them. The monitoring software was developed with LabVIEW 7.0. The experimental results show that the monitoring platform has the functions of real-time parameters displaying, command giving, ISG test, data saving and interactive good human-computer interface. Every hybrid function and operating mode was successfully realized. The adjustment of control strategy, optimization of parameters, and analysis of experiment data were well done.
Number of references:6
Ei main heading:SCADA systems
Ei controlled terms:Buses - Conservation - Energy conservation - Interfaces (computer) - Management - Vehicles
Uncontrolled terms:Design - Experiment - HEV - Management controller - Monitoring platform - CAN-bus - Time parameters - Energy Management Systems - Optimization of parameters - Operating modes - CAN interface - Human-computer interface - Lab VIEW - Control strategies - Integrated Starter Generators - Experiment data - Electrical vehicles
Ei classification codes:432 Highway Transportation - 454 Environmental Engineering - 525.2 Energy Conservation - 663.1 Heavy Duty Motor Vehicles - 722.2 Computer Peripheral Equipment - 731.1 Control Systems - 912.2 Management
Database:Compendex
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36. Accession number:083211445207
Title:Comparison and analysis of computed results for uniformity of intake manifold with different wall functions
Authors:Zhang, Jichun; Li, Xinghu; Yang, Jianguo; Lin, Bo
Author affiliation:Harbin Institute of Technology (Weihai), Weihai 264209, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 7
Issue date:July 2008
Publication year:2008
Pages:p 47-50
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract: Five different wall functions were used to simulate the intake manifold of muti-cylinder gasoline engine by CFD method, and the uniformity of intake mass was analyzed. The computed and analyzed results show that the two layer models wall functions are more accurate than the standard wall function; the non-equilibrium wall function is not suitable for the analysis of uniformity of intake mass because of its worst calculation precision; among the three two-layer models wall functions (Wolfstein model, Norris and Reynolds model and Hassid and Poreh model), the Hassid and Poreh model has the maximum mean intake mass and the smallest no-uniformity.
Number of references:5
Ei main heading:Modal analysis
Ei controlled terms:Automobile engine manifolds - Engine cylinders - Liquid fuels - Petroleum products - Standards - Walls (structural partitions)
Uncontrolled terms:CFD - Intake manifold - Intake uniformity - Wall function - Wall functions - Two-layer models - Reynolds - Calculation precision - CFD methods - Non-equilibrium - Gasoline engines
Ei classification codes:408.2 Structural Members and Shapes - 513.3 Petroleum Products - 523 Liquid Fuels - 612.1.1 Internal Combustion Engine Components - 661.2 Automotive Engine Components - 902.2 Codes and Standards - 921 Mathematics
Database:Compendex
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37. Accession number:083211445208
Title:Situation and prospects of research on hydrodynamic transmission
Authors:Ma, Wenxing; He, Yandong; Liu, Chunbao
Author affiliation:Jilin University, Changchun 130025, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 7
Issue date:July 2008
Publication year:2008
Pages:p 51-55
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract: The situation and progress of the domestic and foreign research on hydrodynamic transmission in recent years were summarized. It includes the CFD numerical simulation of the inner 3-D flow in hydrodynamic transmission elements, the characteristic prediction based on the numerical solution of the 3-D flow field, and the experimental study on the inner complex flow in hydrodynamic elements by means of the advanced flow measurement technique, such as particle image velocimetry (PIV). Finally, the further research directions were put forward as follow: blade design based on 3-D flow theory and transient characteristic study of the flow field.
Number of references:31
Ei main heading:Fluid dynamics
Ei controlled terms:Chlorine compounds - Computer simulation - Flow fields - Flow of fluids - Flow simulation - Flow visualization - Fluid mechanics - Hydrodynamics - Numerical methods - Three dimensional
Uncontrolled terms:Development - Hydrodynamic transmission - Review - 3-D flow - Transient characteristics - Research directions - Numerical solutions - Particle-image velocimetry - Measurement techniques - Blade designs - Complex flows - Experimental studies - Numerical simulations
Ei classification codes:631.1 Fluid Flow, General - 631.1.1 Liquid Dynamics - 723.5 Computer Applications - 804.1 Organic Compounds - 921.6 Numerical Methods - 931.1 Mechanics
Database:Compendex
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38. Accession number:083211445209
Title:Theoretical analysis and experiment on vibration conditions for vibrational air-suction tray precision seeding-machine
Authors:Zhang, Shiping; Chen, Jin; Li, Yaoming
Author affiliation:Jiangsu University, Zhenjiang 212013, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 7
Issue date:July 2008
Publication year:2008
Pages:p 56-59 79
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract: Based on the principle of vibrational air-suction, seeds will be 'boiling' state in the vibrational air-suction tray precision seeding-machine, which can reduce the inner friction force and increase the capacity for sucking seeds motion. According to the granular rejection intention theory, we theoretically studied the seeds movement and calculated out a critical intensity of vibration of the tray precision seeding-machine in which the seeds would be 'boiling' state. The results show that when the rate of seeds sucking is more than 90%, the error between the actual and the critical vibration intention is less than 5%. So the critical condition is right and it can be used to ascertain the operating range of vibration parameters.
Number of references:8
Ei main heading:Agricultural products
Ei controlled terms:Electric network analysis - Lattice vibrations - Seed - Vibrations (mechanical)
Uncontrolled terms:Motion analysis - Precise seeding - Tray culture of seedling - Vibration intensity - Vibrational air-suction - Inner friction force - Critical intensity -
Critical conditions - Operating ranges - Vibration parameters - Theoretical analysis
Ei classification codes:703.1.1 Electric Network Analysis - 821.4 Agricultural Products - 931.1 Mechanics - 933.1.1 Crystal Lattice
Database:Compendex
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39. Accession number:083211445210
Title:Experimental investigation of a new mechanical precision metering device with automatic compensative seeding
Authors:Gong, Linong; Dai, Yuhua; Jiang, Jinlin
Author affiliation:Qingdao Agricultural University, Qingdao 266109, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 7
Issue date:July 2008
Publication year:2008
Pages:p 60-63
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract:Aimed at the seeding absence, a precision metering device assembled with automatic compensation seeding system was developed. A monitoring and controlling system was made to detect and compensate the absence seeding. As soon as the seed cell of the main meter is empty, the sensor will send a signal to single-chip-computer and the assistant meter will start to work for compensation at the right time. The results in the laboratory show that the system can work reliably, the compensation rate is more than 91%, the final absent seeding rate is less than 1.3%, and the
placing precision rate of compensative seeds can reach 91.25%.
Number of references:8
Ei main heading:Metric system
Ei controlled terms:Agricultural products - Seed
Uncontrolled terms:Compensative seeding - Controller - Design - Experiment - Precision metering - Sensor - Metering devices - Single chips - Monitoring and controlling - Precision rates - Seeding rates - Mechanical precision - Experimental
Investigations
Ei classification codes:821.4 Agricultural Products - 902.2 Codes and Standards
Database:Compendex
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40. Accession number:083211445211
Title:Wind erosion experiment and countermeasures on typical farmlands around Beijing
Authors:Feng, Xiaojing; Gao, Huanwen; Wang, Lijie; Li, Hongwen
Author affiliation:Agricultural University of Hebei, Baoding 071001, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 7
Issue date:July 2008
Publication year:2008
Pages:p 64-67
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract: A series wind tunnel experiments were conduced on in typical farmlands around Beijing. The air-born dusts were measured in the fields under different cultivations, tillage managements, cover rates and intersectional angles between wind and the crop rows. The results show that the amount of raising dust increases with the wind velocity by power function; conservation tillage of
one crop a year and two crops a year can reduce wind erosion rate than traditional tillage; the increase of cover rate can reduce the amount, and the more the cover, the better the effect; the amount of raising dust can be changed by the angle between the wind and the crop row, and the amount is highest when zero angle, medium 45 angle, and lowest 90 angle. Finally, some countermeasures such as generalization conservation tillage, hold appropriate stubble and straw in land, were proposed for the wind erosion in typical farmland around Beijing.
Number of references:11
Ei main heading:Erosion
Ei controlled terms:Agricultural machinery - Agriculture - Climatology - Conservation - Crops - Dust - Experiments - Farms - Soil conservation - Soil mechanics - Water conservation
Uncontrolled terms:Experiment - Wind erosion of land surface soil - Wind tunnel - Beijing - Wind erosions - Conservation tillage - Power functions - Wind velocities - Zero angle - Crop rows - Wind tunnel experiments
Ei classification codes:407 Maritime and Port Structures; Rivers and Other Waterways - 443 Meteorology - 444 Water Resources - 451.1 Air Pollution Sources - 454 Environmental Engineering - 483.1 Soils and Soil Mechanics - 821 Agricultural Equipment and Methods; Vegetation and Pest Control - 821.1 Agricultural Machinery and Equipment - 821.4 Agricultural Products - 901.3 Engineering Research
Database:Compendex
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41. Accession number:083211445212
Title:Design and experiment of a new maize field rootstalk chopper
Authors:Ni, Chang'an; Miao, Quansheng; Liu, Yu; Shi, Qingxiang; Gao, Chunyan; Pang, Jing
Author affiliation:He'nan University of Science and Technology, Luoyang 471003, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 7
Issue date:July 2008
Publication year:2008
Pages:p 68-71
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract: This paper analyzed the smashing theory of straight blades, crescent blades and bent blades respectively. With the velocity of roller, the machine speed and the depth in the dust as the test factors, and the percent of pass and the power consumption as the test indexes, the experiments were carried out subsequently. The advantages of crescent blades, such as small disturbance, low power consumption and high pass percent were validated by experiment. Finally, the regressive mathematic model of crescent blades smashing performance was established and the optimum parameters were obtained by regressive analysis.
Number of references:7
Ei main heading:Experiments
Ei controlled terms:Electric power utilization - Human engineering - Mathematical models - Testing
Uncontrolled terms:Experiment - Maize - Optimization - Rootstalks - Smashing and field - Power consumption - Low-power consumption - High-pass - Mathematic modeling - Optimum parameters - Regressive analysis - Machine speeds
Ei classification codes:422.2 Test Methods - 461.4 Ergonomics and Human Factors Engineering - 706.1 Electric Power Systems - 901.3 Engineering Research - 921 Mathematics
Database:Compendex
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42. Accession number:083211445213
Title:Numeric simulation of three-dimensional turbulent flow in low specific-speed centrifugal pump
Authors:Li, Yibin; Wu, Guoxiu
Author affiliation:Lanzhou University of Technology, Lanzhou 730050, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 7
Issue date:July 2008
Publication year:2008
Pages:p 72-75
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract: By adopting time averaged NS equations and RNG k- model, the impeller-volute coupling characteristics were simulated by using SIMPLEC algorithm. The 3-D turbulent flow in centrifugal pump impellers with and without splitter blades were simulated under the different flow rates. When adding splitter blades, the results show that it can effectively control the reflux and flow separation at the impeller outlet. In comparison with performance prediction and experiment, the maximal error between performance prediction and experiment result is no more than 3% under the design flow rate, while 10% under the off-design flow rates.
Number of references:6
Ei main heading:Flow simulation
Ei controlled terms:Blowers - Centrifugal pumps - Experiments - Flow rate - Forecasting - Hydraulic machinery - Pumping plants - Pumps - Rotary pumps - Separation - Three dimensional - Turbulence - Turbulent flow - Well pumps
Uncontrolled terms:Centrifugal pump - Numerical simulation - Performance prediction - Splitter blades - Three-dimensional turbulent flow - Performance predictions - Centrifugal pump impellers - Design flow rate - N-S equations - Impeller outlet - SIMPLEC algorithm - Effectively control - Maximal errors - Coupling characteristics - Time averaging - Design flows - Numeric simulation
Ei classification codes:443.1 Atmospheric Properties - 446 Waterworks - 618.2 Pumps - 618.3 Blowers and Fans - 631 Fluid Flow - 631.1 Fluid Flow, General - 632.2 Hydraulic Equipment and Machinery - 723.5 Computer Applications - 802.3 Chemical Operations - 901.3 Engineering Research - 912.2 Management
Database:Compendex
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43. Accession number:083211445214
Title:Orthogonal experiment on design and performance of a rotational jet sprinkler
Authors:Zhu, Xingye; Yuan, Shouqi; Xiang, Qingjiang; Liu, Junping
Author affiliation:Jiangsu University, Zhenjiang 212013, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 7
Issue date:July 2008
Publication year:2008
Pages:p 76-79
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract: A whirling jet fluid sprinkler was put forward. The working principle of the sprinkler was introduced. An orthogonal array of five factors and four levels was selected to carry out the experiment. The graduations of geometrical parameters which affected working conditions were achieved after the orthogonal experiment, which were diameter of cover plate for outlet, length of beeline sect, length of lead-flow, offset length, length of working area, and pipe length in sequence. Their affects on water distribution, jet range and whiling speed were analyzed respectively. The best geographical parameters of sprinkler typed 10 were summarized. Diameter factors of cover plate for outlet were added to review its actions. The minimum diameter is 5.2 mm, the maximum diameter is 7.2 mm and the best geometrical parameter is 6.2 mm.
Number of references:7
Ei main heading:Experiments
Ei controlled terms:Fluid mechanics - Jets - Offshore oil well production
Uncontrolled terms:Jet - Orthogonal experiment - Rotational sprinkler - Cover plates - Geometrical parameters - Orthogonal experiments - Working conditions - Working principles - Water distributions - Orthogonal arrays - Jet fluid
Ei classification codes:511.1 Oil Field Production Operations - 631.1 Fluid Flow, General - 901.3 Engineering Research - 931.1 Mechanics
Database:Compendex
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44. Accession number:083211445215
Title:Forecast for agricultural machinery equipment level based on sliding window-genetic programming algorithm
Authors:Dong, Xiaohui; Zhao, Han; Feng, Baolin; Xu, Zhaoyun
Author affiliation:Hefei University of Technology, Hefei 230009,China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 7
Issue date:July 2008
Publication year:2008
Pages:p 80-84
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract: Forecast of agricultural machinery equipment level is a complicated non-linear system, whose developmental changes have dual treads of continuity and fluctuation. SWGP (sliding windowgenetic programming) algorithm was provided to implement automatic modeling of dynamic forecast function of agricultural machinery equipment level. In the program, sampling data is obtained by sliding window technology and model is founded automatically by GP-improved algorithm, which can overcome the difficulties of model selection in traditional prediction modeling methods. The results of a computation case show that forecasting values from the model agree well with the real values, which explains that employing SWGP modeling can settle problem for the modeling of complex agricultural machinery equipment level forecast system satisfactorily.
Number of references:8
Ei main heading:Machinery
Ei controlled terms:Agricultural machinery - Automatic programming - Chlorine compounds - Computer programming - Decoding - Forecasting - Genetic algorithms - Genetic programming - Linear systems - Nonlinear systems - Well equipment - Windows
Uncontrolled terms:Agricultural machine - Equipment level - Forecast and analysis - Sliding window - Sliding windows - Automatic modeling - Dynamic forecasting - Sampling data - Improved algorithm - Developmental changes - Model selections
- Prediction modeling - Real values - Programming algorithms
Ei classification codes:402 Buildings and Towers - 446.1 Water Supply Systems - 601 Mechanical Design - 723 Computer Software, Data Handling and Applications - 723.1 Computer Programming - 723.2 Data Processing and Image Processing - 804.1 Organic Compounds - 821.1 Agricultural Machinery and Equipment - 912.2 Management - 961 Systems Science
Database:Compendex
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