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2012年第43卷第1期共收錄41篇
1. Accession number:20120614748684
  Title:Parameter optimization for large-scale production of cattle manure aerobic fermentation
  Authors:Wang, Liang1 ; Liu, Kefeng2 ; Sun, Xiangyang1 ; Yu, Ling3 ; Wang, Hongli2 
  Author affiliation:1  School of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China
                 2 College of Urban and Rural Development, Beijing University of Agriculture, Beijing 102206, China
                 3  College of Agriculture and Biotechnology, China Agricultural University, Beijing 100193, China
  Corresponding author:Sun, X. ([email protected]) 
  Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
  Abbreviated source title:Nongye Jixie Xuebao
  Volume:43
  Issue:1
  Issue date:January 2012
  Publication year:2012
  Pages:115-121
  Language:Chinese
  ISSN:10001298
  CODEN:NUYCA3
  Document type:Journal article (JA)
  Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
  Abstract:With the cattle manure and lignite slag for fermentation materials, based on the single-factor test in the laboratory, C/N, moisture content, room temperature, ventilation time, pH value, organic matter were analyzed by orthogonal optimization to determine the optimum laboratory fermentation parameters as the basis for large-scale production. SPSS 12.0 was used to analyze the optimum parameters of large-scale production to determine the relationship of the factors which affected the fermentation process. The follows were obtained: the factors which affected the fermentation process are C/N, moisture content, room temperature, ventilation time, pH value, organic matter; the optimum parameters of large-scale production are moisture content of raw materials 65%, C/N 30, agent inoculums concentration 2.5 L/m3, the number of turning: once every three days; the time of forced ventilation: 30 min, these are consistent with laboratory parameters; the temperature from the fermented material surface (0~30 cm) of the large-scale production was highest that was incompatible with the result obtained from equipment measurement. It has a remarkable linear correlation with side temperature, y=1.148 7x 4.2773. All the detection indicators of the organic fertilizer in this process reached China's industry standard NY 525-2002.
  Number of references:21
  Main heading:Fermentation
  Controlled terms:Biogeochemistry  -  Biological materials  -  Fertilizers  -  Manures  -  Moisture  -  Moisture determination  -  Optimization  -  Organic compounds  -  pH  -  Process control   -  Slags  -  Ventilation
  Uncontrolled terms:Aerobic fermentation  -  Cattle manures  -  Fermentation process  -  Forced ventilation  -  Industry standards  -  Large-scale production  -  Linear correlation  -  Material surface  -  Optimum parameters  -  Organic fertilizers   -  Parameter optimization  -  pH value  -  Room temperature
  Classification code:944.2 Moisture Measurements  -  921.5 Optimization Techniques  -  804.1 Organic Compounds  -  804 Chemical Products Generally  -  801 Chemistry  -  731 Automatic Control Principles and Applications  -  643.5 Ventilation  -  461.8 Biotechnology  -  461.2 Biological Materials and Tissue Engineering  -  452.3 Industrial Wastes  -  413 Insulating Materials  -  412 Concrete  -  406 Highway Engineering
  DOI:10.6041/j.issn.1000-1298.2012.01.021
  Database:Compendex

2. Accession number:20120614748694
  Title:Design and test on remote rice transplanter automatic steering system
  Authors:Ren, Wentao1 ; Chi, Dexia1, 2 ; Liu, Jinbo1 ; Wei, Dongyu1 ; Yu, Xiaoze1 ; Che, Zhuang1 
  Author affiliation:1  College of Engineering, Shenyang Agricultural University, Shenyang 110866, China
                 2  Liaoning Shihua University, Fushun 113001, China
  Corresponding author:Ren, W. ([email protected]) 
  Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
  Abbreviated source title:Nongye Jixie Xuebao
  Volume:43
  Issue:1
  Issue date:January 2012
  Publication year:2012
  Pages:175-179
  Language:Chinese
  ISSN:10001298
  CODEN:NUYCA3
  Document type:Journal article (JA)
  Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
  Abstract:In order to improve the transplanter automatic operation level and realize remote automatic control of steering operation, with the Kubota NSD8 rice transplanter as the study platform, and under the condition of guarantee the usability of existing steering mechanism, a kind of remote automatic steering system was designed. The system mainly comprised steering actuator and microcomputer control unit, remote transmitter installation and receiver installation, angle sensor, and stepping motor. The system can realize remote automatic control of rice transplanter steering. Experiment on automatic steering performance of remote transplanter was accomplished by the system, transfer function of the steering actuator system was gained via experimental data and exploiting the way of system identification, and the system performance was analysed. The analysis showed that automatic steering system can provide reliable guarantee for realizing remote rice transplanter. It was tested about 180° and 90° of flat ground steering, test showed that automatic steering system can realize steering operation process of field work track predetermined.
  Number of references:10
  Main heading:Actuators
  Controlled terms:Automation  -  Control  -  Design  -  Process control
  Uncontrolled terms:Angle sensors  -  Automatic steering  -  Design and tests  -  Experimental data  -  Field works  -  Microcomputer control  -  Remote  -  Rice transplanter  -  Steering actuators  -  Steering mechanisms   -  Steering operations  -  Transplanter
  Classification code:408 Structural Design  -  632 Hydraulics, Pneumatics and Related Equipment, and Fluidics  -  731 Automatic Control Principles and Applications
  DOI:10.6041/j.issn.1000-1298.2012.01.031
  Database:Compendex

3. Accession number:20120614748686
  Title:Change of electric parameters and physiological parameters of Kiwi of storage period
  Authors:Tang, Yan1 ; Du, Guangyuan2 ; Zhang, Jishu1 
  Author affiliation:1  College of Life Science, Northwest A and F University, Yangling, Shaanxi 712100, China
                 2  College of Science, Northwest A and F University, Yangling, Shaanxi 712100, China
  Corresponding author:Zhang, J. ([email protected]) 
  Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
  Abbreviated source title:Nongye Jixie Xuebao
  Volume:43
  Issue:1
  Issue date:January 2012
  Publication year:2012
  Pages:127-133
  Language:Chinese
  ISSN:10001298
  CODEN:NUYCA3
  Document type:Journal article (JA)
  Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
  Abstract:'Qinmei' kiwifruit was used to investigate the change of electric properties and physiological parameters with the extension of storage time under the condition of storage at 20°C. Complex impedance (Z), parallel equivalent capacitance (Cp) and impedance angle (θ) three electrical parameters and 12 physiological parameters of fruits such as firmness were measured synchronously. The results showed that the Z of Kiwi dropped significantly on the late period of storage, Cp increased significantly on the late period of storage. Firmness and total acid (TA) of fruits were increased and total soluble sugar (TSS) was decreased with the extension of storage time. The reducing of content of starch and cellulose was positively correlated with the declining of fruit firmness. Z can quantify eight physiological parameters such as firmness of fruits, impedance angle (θ) can quantify five physiological parameters in the characteristic frequency of 0.1 kHz. Cp can quantify six physiological parameters in the characteristic frequency of 1 MHz and 1.58 MHz.
  Number of references:18
  Main heading:Physiological models
  Controlled terms:Electric properties  -  Energy storage  -  Fruits  -  Physiology  -  Sugars
  Uncontrolled terms:Characteristic frequencies  -  Complex impedance  -  Electric parameters  -  Electrical parameter  -  Fruit firmness  -  Kiwifruits  -  Parallel equivalent  -  Physiological parameters  -  Soluble sugars  -  Storage periods   -  Storage time
  Classification code:461.1 Biomedical Engineering  -  461.9 Biology  -  701.1 Electricity: Basic Concepts and Phenomena  -  702 Electric Batteries and Fuel Cells  -  804.1 Organic Compounds  -  821.4 Agricultural Products
  DOI:10.6041/j.issn.1000-1298.2012.01.023
  Database:Compendex

4. Accession number:20120614748675
  Title:Finite element simulation and analysis on soil rotary tillage with external vibration excitation
  Authors:Jiang, Jiandong1 ; Gao, Jie1 ; Zhao, Yingdi1 ; Hoogmoed, Willem2 ; Zhang, Xian1 
  Author affiliation:1  The Key Laboratory of Special Purpose Equipment and Advanced Processing Technology, Zhejiang University of Technology, Hangzhou 310014, China
                 2   Wageningen University, Wageningen 6700 HB, Netherlands
  Corresponding author:Zhang, X. ([email protected]) 
  Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
  Abbreviated source title:Nongye Jixie Xuebao
  Volume:43
  Issue:1
  Issue date:January 2012
  Publication year:2012
  Pages:58-62
  Language:Chinese
  ISSN:10001298
  CODEN:NUYCA3
  Document type:Journal article (JA)
  Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
  Abstract:A method of compacted soil rotary tilling with variant frequency vibrationis proposed. The tea garden soil physical parameters was measured with soil triaxial test referring to the MAT147 soil model from LS-DYNA material library, then a soil constitutive model of the southern hills' harden soils and the finite element numerical simulation model for soil vibratory rotary cutting process were built. Through 3-D numerical simulation and analysis, the influence rules on soil cutting resistance caused by many factors of external vibration excitation such as amplitude, frequency and vibration model were studied, and the optimal vibration operation parameters conducive to soil cutting resistance reducing was deduced and confirmed. The results show that the finite element method SPH is effective for large strain and high strain rate numerical simulation of compacted soil rotary cutting, and choosing appropriate vibration frequency, amplitude and vibration types of vibration excitation can reduce tillage mechanism power and improve working efficiency.
  Number of references:20
  Main heading:Vibration analysis
  Controlled terms:Agricultural machinery  -  Agriculture  -  Concrete vibrating  -  Cutting  -  Finite element method  -  Geologic models  -  Magnetic disk storage  -  Mathematical models  -  Numerical methods  -  Soils   -  Strain rate  -  Three dimensional
  Uncontrolled terms:3-D numerical simulation  -  Compacted soil  -  Cutting process  -  Cutting resistance  -  External vibrations  -  Finite element numerical simulation  -  Finite element simulations  -  High strain rates  -  Influence rule  -  Large strains   -  LS-DYNA  -  Operation parameters  -  Physical parameters  -  Rotary tillage  -  Soil constitutive model  -  Soil model  -  Tea garden soils  -  Triaxial test  -  Vibration excitation  -  Vibration frequency   -  Vibration model  -  Working efficiency
  Classification code:943.2 Mechanical Variables Measurements  -  921.6 Numerical Methods  -  921 Mathematics  -  902.1 Engineering Graphics  -  821.1 Agricultural Machinery and Equipment  -  821 Agricultural Equipment and Methods; Vegetation and Pest Control  -  708.4 Magnetic Materials  -  604.1 Metal Cutting  -  483.1 Soils and Soil Mechanics  -  481.1 Geology  -  422 Strength of Building Materials; Test Equipment and Methods  -  421 Strength of Building Materials; Mechanical Properties  -  412 Concrete
  DOI:10.6041/j.issn.1000-1298.2012.01.012
  Database:Compendex

5. Accession number:20120614748682
  Title:3-D static simulation of the effect of upward flow velocity on separation efficiency of three-phase separator in UASB reactor
  Authors:Hao, Feilin1 ; Shen, Mingwei2 
  Author affiliation:1   College of Biology and Environmental Engineering, Zhejiang Shuren University, Hangzhou 310015, China
                 2  College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310058, China
  Corresponding author:Hao, F. ([email protected]) 
  Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
  Abbreviated source title:Nongye Jixie Xuebao
  Volume:43
  Issue:1
  Issue date:January 2012
  Publication year:2012
  Pages:101-107
  Language:Chinese
  ISSN:10001298
  CODEN:NUYCA3
  Document type:Journal article (JA)
  Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
  Abstract:With the aim to evaluate the appropriate upward flow velocity in UASB reactor, the separation efficiency of solid, liquid, gas in three-phase separator (TS) of USAB reactor was simulated via CFD technology based on Eulerian multi-phase model. Five upward flow velocities (UFV) as 0.50, 0.75, 1.00, 1.25, 1.50 m/h were adopted in simulation for a typical UASB reactor. The result showed that the UFV had an obvious effect on the flow pattern inside the TS, the average velocity of liquid in the whole UASB reactor was around 3 times of the designed UFV, the average velocity of gas was 10% higher than that of the liquid, the average velocity of solid was lower and about half of the designed UFV, and the maximal solid UFV was in the same level with the UFV. The separation efficiency of solid and gas was higher in low UFV than that in the higher situation, while the difference was less than 2%. Site experiment showed a good agreement between the simulated data and measured one with a relative error within 8%.
  Number of references:22
  Main heading:Computational fluid dynamics
  Controlled terms:Efficiency  -  Flow velocity  -  Liquids  -  Multiphase flow  -  Separators  -  Three dimensional  -  Three dimensional computer graphics  -  Velocity
  Uncontrolled terms:3D simulations  -  Average velocity  -  Eulerian  -  Multiphase model  -  Relative errors  -  Separation efficiency  -  Simulated data  -  Static simulations  -  Technology-based  -  UASB   -  UASB reactor  -  Upward flow  -  USAB reactor
  Classification code:931.1 Mechanics  -  913.1 Production Engineering  -  902.1 Engineering Graphics  -  931.2 Physical Properties of Gases, Liquids and Solids  -  802.1 Chemical Plants and Equipment  -  631.1 Fluid Flow, General  -  631 Fluid Flow  -  723.5 Computer Applications
  DOI:10.6041/j.issn.1000-1298.2012.01.019
  Database:Compendex

6. Accession number:20120614748681
  Title:Double-loop intelligent control based on gray ant combination prediction algorithm for biomass gasifies
  Authors:Liu, Hui1 ; Pang, Youxia2 ; Tang, Yong2 ; Liang, Liang2 
  Author affiliation:1  Department of Electronics and Communication Engineering, Changsha University, Changsha 410003, China
                 2 Department of Mechanical and Electrical Engineering, Changsha University, Changsha 410003, China
  Corresponding author:Liu, H. ([email protected]) 
  Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
  Abbreviated source title:Nongye Jixie Xuebao
  Volume:43
  Issue:1
  Issue date:January 2012
  Publication year:2012
  Pages:94-100
  Language:Chinese
  ISSN:10001298
  CODEN:NUYCA3
  Document type:Journal article (JA)
  Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
  Abstract:The process of biomass gasify has the characteristics of nonlinear, large delay and strong load disturbance. For these features, a double-loop intelligent control based on gray ant combination prediction algorithm was presented. Firstly, the gray prediction algorithm was used to establish temperature model of gasifies. Secondly, considering possible disturbance, the ant algorithm was introduced to optimize the gray temperature model. The temperature sub-control system was based on the optimized gray temperature model. Finally, the variable universe fuzzy control algorithm was used in the oxygen content sub-control system. The gasify-air was controlled by the fuzzy rules in order to stabilize the temperature of gasifies, and reduce the oxygen content of the combustible gases. The validity and superiority was showed in the results of simulation and work site.
  Number of references:12
  Main heading:Algorithms
  Controlled terms:Control systems  -  Forecasting  -  Fuzzy control  -  Intelligent control  -  Optimization  -  Oxygen  -  Temperature control
  Uncontrolled terms:Ant colony algorithms  -  Double-loop control  -  Gasifies  -  Grey prediction  -  Variable universe
  Classification code:723 Computer Software, Data Handling and Applications  -  731 Automatic Control Principles and Applications  -  804 Chemical Products Generally  -  921 Mathematics  -  921.5 Optimization Techniques
  DOI:10.6041/j.issn.1000-1298.2012.01.018
  Database:Compendex

7. Accession number:20120614748701
  Title:Modified model of static friction coefficient of joint interfaces based on fractal theory
  Authors:Lan, Guosheng1 ; Zhang, Xueliang1 ; Ding, Hongqin1 ; Wen, Shuhua1 ; Zhang, Zongyang1 ; Lu, Qingbo1, 2 
  Author affiliation:1  College of Mechanical Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, China
                 2  Department of Electrical and Electronic Engineering, Zhengzhou Technical College, Zhengzhou 450121, China
  Corresponding author:Zhang, X. ([email protected]) 
  Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
  Abbreviated source title:Nongye Jixie Xuebao
  Volume:43
  Issue:1
  Issue date:January 2012
  Publication year:2012
  Pages:213-218
  Language:Chinese
  ISSN:10001298
  CODEN:NUYCA3
  Document type:Journal article (JA)
  Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
  Abstract:A modified fractal model of static friction coefficient of joint interfaces based on normal load model and modified size distribution is proposed. Furthermore, numerical simulation was carried out to obtain the complicated nonlinear relations. The results showed that the static friction coefficient versus the micro convex nonlinear relation with the normal load and increased with the normal load and material property increase, decreased with fractal characteristic length scale parameter G*, but complicatedly with D. This is explained that the modified model could be used to analyze and predict static friction coefficient.
  Number of references:11
  Main heading:Stiction
  Controlled terms:Fractals  -  Tribology
  Uncontrolled terms:Fractal characteristics  -  Fractal model  -  Fractal theory  -  Joint interfaces  -  Material property  -  Modified model  -  Nonlinear relations  -  Normal loads  -  Static friction coefficient
  Classification code:921 Mathematics  -  931 Classical Physics; Quantum Theory; Relativity  -  931.1 Mechanics
  DOI:10.6041/j.issn.1000-1298.2012.01.038
  Database:Compendex

8. Accession number:20120614748667
  Title:Autonomous vehicle system based on hybrid architecture
  Authors:Xiu, Caijing1 ; Chen, Hui1 
  Author affiliation:1  School of Automotive Studies, Tongji University, Shanghai 201804, China
  Corresponding author:Xiu, C. ([email protected]) 
  Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
  Abbreviated source title:Nongye Jixie Xuebao
  Volume:43
  Issue:1
  Issue date:January 2012
  Publication year:2012
  Pages:18-21
  Language:Chinese
  ISSN:10001298
  CODEN:NUYCA3
  Document type:Journal article (JA)
  Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
  Abstract:Hybrid architecture of autonomous vehicle system was built based both on function and behavior so that requirements in autonomy, real-time and adaptability could be met. Functional decomposition architecture was used to automatically control the vehicle while behavioral decomposition architecture was used to handle the complexity and variability of environment which highly challenged responsiveness and adaptability of vehicle's planning system. Experimental results showed that a hybrid architecture based system enabled the vehicle to drive autonomously while having sufficient adaptability and real-time as the environment changes.
  Number of references:5
  Main heading:Architecture
  Controlled terms:Vehicles
  Uncontrolled terms:Autonomous Vehicles  -  Behavior decomposition  -  Environment change  -  Functional decomposition  -  Hybrid architecture  -  Hybrid architectures  -  Planning systems
  Classification code:402 Buildings and Towers  -  432 Highway Transportation
  DOI:10.6041/j.issn.1000-1298.2012.01.004
  Database:Compendex

9. Accession number:20120614748696
  Title:Performance and carbon emission analysis on glass-covering greenhouse heating with ground source heat pump technology
  Authors:Chai, Lilong1 ; Ma, Chengwei2 
  Author affiliation:1  Vegetable Research Center, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China
                 2  College of Water Conservancy and Civil Engineering, China Agricultural University, Beijing 100083, China
  Corresponding author:Ma, C. ([email protected]) 
  Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
  Abbreviated source title:Nongye Jixie Xuebao
  Volume:43
  Issue:1
  Issue date:January 2012
  Publication year:2012
  Pages:185-191
  Language:Chinese
  ISSN:10001298
  CODEN:NUYCA3
  Document type:Journal article (JA)
  Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
  Abstract:The heating test was conducted in a glass-covering multi-span greenhouse (756 m2) with groundwater-style GSHP technology. The heat quantity estimating models based on air enthalpy difference method (AEDM) were developed according to the heating characteristics of GSHP. The economical performance and carbon footprint (greenhouse gas emission level) of the GSHP was analyzed and compared with currently widely used coal fired heating system (CFHs)and natural gas fired heating system (GFHs) based on investigated various energy sources price during heating tests. According to the compared results, the GSHPs heating cost is higher than CFHs, but lower than GFHs. Meanwhile, GSHPs CO2 emission during heating is higher than GFHs, but lower than CFHs.
  Number of references:25
  Main heading:Geothermal heat pumps
  Controlled terms:Carbon  -  Carbon dioxide  -  Environmental impact  -  Gas emissions  -  Glass  -  Greenhouse gases  -  Greenhouses  -  Groundwater  -  Heating  -  Heating equipment
  Uncontrolled terms:Carbon emissions  -  Carbon footprint  -  Energy source  -  Enthalpy differences  -  Gas fired heating systems  -  Greenhouse heating  -  Ground source heat pump  -  Heat quantity  -  Heating system  -  Heating tests   -  Multi-spans
  Classification code:804.2 Inorganic Compounds  -  804 Chemical Products Generally  -  643.1 Space Heating  -  642.2 Industrial Furnaces and Components  -  812.3 Glass  -  641.2 Heat Transfer  -  451.1 Air Pollution Sources  -  444.2 Groundwater  -  402.1 Industrial and Agricultural Buildings  -  454.2 Environmental Impact and Protection
  DOI:10.6041/j.issn.1000-1298.2012.01.033
  Database:Compendex

10. Accession number:20120614748691
  Title:Response surface methodology on ultrasonic extraction technology of total coumarin from cassava peel
  Authors:Chen, Xiaoming1 ; Li, Kaimian2 ; Tai, Jianxiang3 ; Ye, Jianqiu2 ; Lu, Xiaojing2 ; Lü, Feijie3 
  Author affiliation:1  College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China
2  Institute of Tropical Crops Genetic Resources, Chinese Academy of Tropical Agricultural Sciences, Danzhou 571737, China
                 3  Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing 100081, China
  Corresponding author:Lü, F. ([email protected]) 
  Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
  Abbreviated source title:Nongye Jixie Xuebao
  Volume:43
  Issue:1
  Issue date:January 2012
  Publication year:2012
  Pages:158-164 152
  Language:Chinese
  ISSN:10001298
  CODEN:NUYCA3
  Document type:Journal article (JA)
  Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
  Abstract:With the aim to take full advantage of coumarin in cassava peel, the extraction technology of total coumarin was first researched from cassava peels by ultrasonic-assist. The optimal extraction technology condition of total coumarin was determined by the single factor experiment and Box-Behnken design test. The results indicated that the optimal extraction conditions were as follows: ethanol concentration 95%, ultrasonic power 550 W, ultrasonic extraction time 90 min, and ultrasonic extraction temperature 60°C, liquid-solid ratio 12 mL/g. Under the optimal extraction conditions, the average content of total coumarin in avtive extraction was 2.48 mg/g. The effect sequence of four main factors for the content of total coumarin are as follows: ultrasonic power, extraction temperature, extraction time, liquid-solid ratio. Compared with the traditional solvent extraction, ultrasonic extraction has obvious advantages including the higher content of total coumarin, faster extraction speed, good activity extracts, less solvent and etc.
  Number of references:11
  Main heading:Solvent extraction
  Controlled terms:Ethanol  -  Liquids  -  Optimization  -  Sonochemistry  -  Surface properties  -  Technology
  Uncontrolled terms:Cassava peel  -  Response Surface Methodology  -  Technology optimization  -  Total coumarin  -  Ultrasonic extraction
  Classification code:523 Liquid Fuels  -  753 Ultrasonics and Applications  -  802.3 Chemical Operations  -  901 Engineering Profession  -  921.5 Optimization Techniques  -  931.2 Physical Properties of Gases, Liquids and Solids
  DOI:10.6041/j.issn.1000-1298.2012.01.028
  Database:Compendex

11. Accession number:20120614748692
  Title:Visual simulating virtual tree movement in wind
  Authors:Tang, Liyu1 ; Zou, Jie1 ; Lin, Ding1 ; Chen, Chongcheng1 
  Author affiliation:1  Spatial Information Research Center of Fujian, Fuzhou University, Fuzhou 350002, China
  Corresponding author:Tang, L. ([email protected]) 
  Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
  Abbreviated source title:Nongye Jixie Xuebao
  Volume:43
  Issue:1
  Issue date:January 2012
  Publication year:2012
  Pages:165-169
  Language:Chinese
  ISSN:10001298
  CODEN:NUYCA3
  Document type:Journal article (JA)
  Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
  Abstract:In order to better understand the wind affects the tree architecture deformation intuitively, an efficient modeling strategy of virtual tree swaying in wind was proposed based on the analysis of the existing thought and methods to simulate the tree movement in wind. The method used procedure function with stochastic factor to simulate the wind field; and the cantilever beam was used to simulate a segment of a stem as the mechanical analysis unit, the deformation of the beam in wind force based on the theory of wind projection and beam element was computed. Then the force transmission and movement compounding method was used to solve the whole tree movement in wind. Furthermore, some software function modules, which integrated with the parametric tree modeling prototype system, were developed. Taking Phyllostachys pubescens as an example, the tree swaying was simulated in different wind velocities and with different modulus of elasticity. The result is in accordance with the practical visual effects.
  Number of references:18
  Main heading:Forestry
  Controlled terms:Deformation  -  Three dimensional
  Uncontrolled terms:3D models  -  Beam elements  -  Force transmission  -  Mechanical analysis  -  Modeling strategy  -  Parametric trees  -  Prototype system  -  Pubescens  -  Simulation  -  Software functions   -  Stochastic factors  -  Virtual plant  -  Virtual tree  -  Visual effects  -  Wind field  -  Wind forces  -  Wind velocities
  Classification code:421 Strength of Building Materials; Mechanical Properties  -  422 Strength of Building Materials; Test Equipment and Methods  -  821.0 Woodlands and Forestry  -  902.1 Engineering Graphics
  DOI:10.6041/j.issn.1000-1298.2012.01.029
  Database:Compendex

12. Accession number:20120614748697
  Title:Predictive decoupled control of WSN nodes greenhouse environment simulation experimental system
  Authors:Zhang, Rongbiao1 ; Chu, Fuhuan1 ; Huang, Xianlin1 ; Shen, Min1 
  Author affiliation:1  School of Electrical and Information Engineering, Jiangsu University, Zhenjiang 212013, China
  Corresponding author:Zhang, R. ([email protected]) 
  Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
  Abbreviated source title:Nongye Jixie Xuebao
  Volume:43
  Issue:1
  Issue date:January 2012
  Publication year:2012
  Pages:192-196
  Language:Chinese
  ISSN:10001298
  CODEN:NUYCA3
  Document type:Journal article (JA)
  Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
  Abstract:In view of the strong coupling between temperature and relative humidity in the greenhouse simulation system, an adaptive decoupling method based on dynamic matrix control was proposed. Taking the measure of feedforward compensation to eliminate interaction between channels of temperature and humidity, an adaptive decoupling algorithm by weighting was designed. The proposed method can adjust the decoupling parameters online under different operating modes, effectively overcome the effect of model severe mismatch to control accuracy. Compared with the traditional PID control, simulation and experimental results both indicated the proposed strategy greatly improved the control performance.
  Number of references:11
  Main heading:Adaptive control systems
  Controlled terms:Adaptive algorithms  -  Greenhouses  -  Humidity control  -  Sensor nodes  -  Three term control systems
  Uncontrolled terms:Adaptive decoupling  -  Control accuracy  -  Control performance  -  Decoupled control  -  Dynamic decoupling  -  Dynamic matrix control  -  Feed-forward compensation  -  Greenhouse environment  -  ON dynamics  -  Operating modes   -  Simulation systems  -  Strong coupling  -  Temperature and humidity control  -  Temperature and relative humidity  -  Wireless sensor
  Classification code:402 Buildings and Towers  -  402.1 Industrial and Agricultural Buildings  -  722 Computer Systems and Equipment  -  723 Computer Software, Data Handling and Applications  -  731.1 Control Systems  -  921 Mathematics
  DOI:10.6041/j.issn.1000-1298.2012.01.034
  Database:Compendex

13. Accession number:20120614748679
  Title:Optimization for combination of irrigation technique element for border irrigation
  Authors:Nie, Weibo1 ; Fei, Liangjun1 ; Ma, Xiaoyi2 
  Author affiliation:1  Institute of Water Resources, Xi'an University of Technology, Xi'an 710048, China
                 2  Key Laboratory for Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Northwest A and F University, Yangling, Shaanxi 712100, China
  Corresponding author:Nie, W. ([email protected]) 
  Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
  Abbreviated source title:Nongye Jixie Xuebao
  Volume:43
  Issue:1
  Issue date:January 2012
  Publication year:2012
  Pages:83-88 107
  Language:Chinese
  ISSN:10001298
  CODEN:NUYCA3
  Document type:Journal article (JA)
  Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
  Abstract:Based on the field experiments carried out in Yangling, the values of irrigation  performance were simulated by the WinSRFR software, and the influence of border length, field slope, unit discharge and cutoff time on irrigation application efficiency, distribution uniformity and storage efficiency were analyzed. On this basis, combined with uniform design and multiple regression analysis, a single-objective optimization model was established including irrigation application efficiency, distribution uniformity and storage efficiency, and taking unit discharge and cutoff time as variables. The model was solved by genetic algorithms, the optimized combination of irrigation technique element under different theories of water requirement were proposed in Wangshang Village, the results show that it can realize a high irrigation performance and water saving for border irrigation through a proper selection of unit discharge and cutoff time.
  Number of references:16
  Main heading:Irrigation
  Controlled terms:Efficiency  -  Mathematical models  -  Optimization  -  Regression analysis  -  Water conservation
  Uncontrolled terms:Border irrigation  -  Distribution uniformity  -  Field experiment  -  Irrigation performance  -  Multiple regression analysis  -  Optimization model  -  Single objective optimization  -  Storage efficiency  -  Uniform Design  -  Unit discharge   -  Water requirements  -  Water saving
  Classification code:444 Water Resources  -  821.3 Agricultural Methods  -  913.1 Production Engineering  -  921 Mathematics  -  921.5 Optimization Techniques  -  922.2 Mathematical Statistics
  DOI:10.6041/j.issn.1000-1298.2012.01.016
  Database:Compendex

14. Accession number:20120614748677
  Title:Advance of study on soil water repellency
  Authors:Li, Yi1 ; Shang, Yanling1 ; Li, Zhenhua1 ; Liu, Shibin1 
  Author affiliation:1  College of Water Resources and Architectural Engineering, Northwest A and F University, Yangling, Shaanxi 712100, China
  Corresponding author:Li, Y. ([email protected]) 
  Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
  Abbreviated source title:Nongye Jixie Xuebao
  Volume:43
  Issue:1
  Issue date:January 2012
  Publication year:2012
  Pages:68-75
  Language:Chinese
  ISSN:10001298
  CODEN:NUYCA3
  Document type:Journal article (JA)
  Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
  Abstract:The basic concept of soil water repellency was introduced, the effects of soil water repellency on field water cycle, soil and water conservation, and groundwater environment was summed up. The reasons of soil water repellency were analyzed. The domestic and international methods used for detecting the degree of soil water repellency and their characteristics were introduced. The research advancement of spatial variability for soil water repellency, soil water movement of water repellent soil during infiltration and evaporation process, and measures for improving infiltration ability of hydrophobic soil were also reviewed and assessed thoroughly. Since there were closed associations between soil water repellency and filed water cycle, microbe activity, runoff and sediment production, and pollution of ground water environment, it was urgent to do related research.
  Number of references:59
  Main heading:Soil moisture
  Controlled terms:Anoxic sediments  -  Groundwater  -  Groundwater pollution  -  Seepage  -  Water conservation
  Uncontrolled terms:Basic concepts  -  Evaporation process  -  Groundwater environment  -  Hydrophobic soils  -  Sediment production  -  Soil and water conservation  -  Soil water movement  -  Soil water repellency  -  Spatial variability  -  Water cycle   -  Water drop penetration time  -  Water repellent soils
  Classification code:407 Maritime and Port Structures; Rivers and Other Waterways  -  441 Dams and Reservoirs; Hydro Development  -  444 Water Resources  -  444.2 Groundwater  -  483 Soil Mechanics and Foundations  -  483.1 Soils and Soil Mechanics
  DOI:10.6041/j.issn.1000-1298.2012.01.014
  Database:Compendex

15. Accession number:20120614748695
  Title:CAN application-layer protocol design of intelligent monitoring system for cotton-picking machine
  Authors:Miao, Zhonghua1 ; Chu, Jian'gang1 ; Liu, Chengliang2 ; Han, Zengde3 ; Gan, Bangxing3 ; Hao, Fuping3 
  Author affiliation:1  School of Mechatronic Engineering and Automation, Shanghai University, Shanghai 200072, China
                2  School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
                3  Modern Agricultural Equipment Co., Ltd., Beijing 100083, China
  Corresponding author:Miao, Z. ([email protected]) 
  Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
  Abbreviated source title:Nongye Jixie Xuebao
  Volume:43
  Issue:1
  Issue date:January 2012
  Publication year:2012
  Pages:180-184
  Language:Chinese
  ISSN:10001298
  CODEN:NUYCA3
  Document type:Journal article (JA)
  Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
  Abstract:A digital intelligent monitoring system based on CAN bus was constructed. Based on CAN 2.0B frame structure, the principle and method of the CAN bus application-layer protocol constitution were addressed by analyzing the message identifier of extended superframe. The CAN bus application-layer protocol of monitoring system suited for cotton-picking machine was proposed. This protocol was applied on the prototype of cotton-picking machine. The experiment results showed that the proposed protocol not only met the need of intelligent monitoring system, but also be characterized by good portability and scalability. The research results can also be applied in other agricultural and engineer machinery.
  Number of references:6
  Main heading:Monitoring
  Controlled terms:Agricultural machinery  -  Cotton
  Uncontrolled terms:Application-layer protocol  -  CAN bus  -  Cotton-picking machine  -  Frame structure  -  Intelligent monitoring systems  -  Monitoring system  -  Research results  -  Superframe
  Classification code:821.1 Agricultural Machinery and Equipment  -  821.4 Agricultural Products  -  941 Acoustical and Optical Measuring Instruments  -  942 Electric and Electronic Measuring Instruments  -  943 Mechanical and Miscellaneous Measuring Instruments  -  944 Moisture, Pressure and Temperature, and Radiation Measuring Instruments
  DOI:10.6041/j.issn.1000-1298.2012.01.032
  Database:Compendex

16. Accession number:20120614748665
  Title:Estimation of vehicle sideslip angle based on local linearization
  Authors:Ding, Nenggen1 ; Li, Danhua1 ; Xu, Jing1 ; Wang, Jian1 ; Yu, Guizhen1 
  Author affiliation:1  School of Transportation Science and Engineering, Beihang University, Beijing 100191, China
  Corresponding author:Ding, N. ([email protected]) 
  Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
  Abbreviated source title:Nongye Jixie Xuebao
  Volume:43
  Issue:1
  Issue date:January 2012
  Publication year:2012
  Pages:6-11
  Language:Chinese
  ISSN:10001298
  CODEN:NUYCA3
  Document type:Journal article (JA)
  Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
  Abstract:A numerical methodology for designing observer feedback gains based on local linearization was proposed to make employing tire models with a higher accuracy and more complicated expressions become possible. The proposed methodology was implemented by discretization of the nonlinear system in the state space and calculation of the feedback gains at a certain given number of operating points using numerical approaches. The gains at discretized operating points were fitted to the expressions with respect to state variables to facilitate real-time observation and implementations. The effectiveness and parameter variation robustness of the proposed methodology were evaluated in a high-fidelity vehicle dynamics simulation environment, and the simulation results show that the proposed methodology has a high estimation accuracy and good robustness.
  Number of references:10
  Main heading:Feedback linearization
  Controlled terms:Nonlinear feedback  -  Real variables  -  State feedback
  Uncontrolled terms:Discretizations  -  Estimation of vehicles  -  Feedback gain  -  High fidelity  -  Local linearization  -  Non-linear observer  -  Numerical approaches  -  Numerical methodologies  -  Operating points  -  Parameter variation   -  Real-time observation  -  Sideslip angles  -  State space  -  State variables  -  Tire models  -  Vehicle dynamics simulation  -  Vehicle stability
  Classification code:731.1 Control Systems  -  921 Mathematics
  DOI:10.6041/j.issn.1000-1298.2012.01.002
  Database:Compendex

17. Accession number:20120614748688
  Title:Effect of edible coatings on physiology and quality of mushrooms (Agaricus bisporus)
  Authors:Wang, Xiangyou1 ; Yan, Congcong1 ; Liu, Zhanli1 
  Author affiliation:1  School of Agricultural and Food Engineering, Shandong University of Technology, Zibo 255049, China
  Corresponding author:Wang, X. ([email protected]) 
  Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
  Abbreviated source title:Nongye Jixie Xuebao
  Volume:43
  Issue:1
  Issue date:January 2012
  Publication year:2012
  Pages:141-145
  Language:Chinese
  ISSN:10001298
  CODEN:NUYCA3
  Document type:Journal article (JA)
  Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
  Abstract:The effects of carrageenan, carboxymethyl cellulose solution and their complex film on the physiology and quality of mushrooms stored at (2±1)°C were studied. The minimum loss of weight was obtained in fruits coated with CMC coating, the minimum value of respiration rate, PPO activity, membrane permeability and the maximum hardness and L* value were obtained in mushrooms coated with carrageenan coating. Overall, the preservation effect of carrageenan film is the best, and it can extend the shelf-life of Agaricus bisporus to more than 12 d.
  Number of references:19
  Main heading:Coatings
  Controlled terms:Food additives  -  Fungi  -  Physiology  -  Wood preservation
  Uncontrolled terms:Agaricus bisporus  -  Carboxy-methyl cellulose  -  Carrageenans  -  Complex films  -  Edible coating  -  Maximum hardness  -  Membrane permeability  -  Minimum value  -  Respiration rate  -  Shelf life
  Classification code:461.9 Biology  -  539 Metals Corrosion and Protection; Metal Plating  -  803 Chemical Agents and Basic Industrial Chemicals  -  804 Chemical Products Generally
  DOI:10.6041/j.issn.1000-1298.2012.01.025
  Database:Compendex

18. Accession number:20120614748669
  Title:Control strategy of high-pressure two-actuator fuel injection system
  Authors:Wang, Yupeng1 ; Liu, Fushui1 ; Liu, Xinghua1 
  Author affiliation:1  School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China
  Corresponding author:Liu, F. ([email protected]) 
  Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
  Abbreviated source title:Nongye Jixie Xuebao
  Volume:43
  Issue:1
  Issue date:January 2012
  Publication year:2012
  Pages:28-32
  Language:Chinese
  ISSN:10001298
  CODEN:NUYCA3
  Document type:Journal article (JA)
  Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
  Abstract:According to the working principle of the two-actuator fuel injection system, the available control modes were discussed firstly, the delay time from control signal to fuel injection was analyzed, variation characteristics of NOP at different speeds were figured out and injection characteristics were explored then, the experimental results showed that the difference between SV and NCV control angle could change the value of NOP, NCP and MFIP effectively. Finally, the control algorithms were explored emphatically, calculating method for NCV desired SOI and durations were introduced and the control strategy of two-actuator fuel injection system was proposed, and the NOP control MAP that reflected it tendency with different speeds and the control angle difference was analyzed, which provided the basic theory for vehicle purpose.
  Number of references:8
  Main heading:Fuel injection
  Controlled terms:Actuators  -  Algorithms  -  Fuels  -  Voltage stabilizing circuits
  Uncontrolled terms:Basic theory  -  Calculating methods  -  Control angles  -  Control modes  -  Control signal  -  Control strategies  -  Delay Time  -  Different speed  -  Fuel injection systems  -  Two-actuator fuel injection system   -  Variation characteristics  -  Working principles
  Classification code:723 Computer Software, Data Handling and Applications  -  713.5 Electronic Circuits Other Than Amplifiers, Oscillators, Modulators, Limiters, Discriminators or Mixers  -  632 Hydraulics, Pneumatics and Related Equipment, and Fluidics  -  921 Mathematics  -  524 Solid Fuels  -  522 Gas Fuels  -  521 Fuel Combustion and Flame Research  -  523 Liquid Fuels
  DOI:10.6041/j.issn.1000-1298.2012.01.006
  Database:Compendex

19. Accession number:20120614748702
  Title:Effect of improved stator curve on characteristic of high-pressure intra-vane type pump
  Authors:Li, Shaonian1 ; Wei, Liejiang1 ; Ji, Hong1 ; Wang, Zhengrong1 ; Na, Yanqing1 
  Author affiliation:1  School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou 730050, China
  Corresponding author:Li, S. ([email protected]) 
  Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
  Abbreviated source title:Nongye Jixie Xuebao
  Volume:43
  Issue:1
  Issue date:January 2012
  Publication year:2012
  Pages:219-223
  Language:Chinese
  ISSN:10001298
  CODEN:NUYCA3
  Document type:Journal article (JA)
  Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
  Abstract:Big radius arc of stator curve in intra-vane type pump was replaced by an equal velocity curve whose radius was changed according to rotation angle. And advance rising pressure of oil in working room, contract force of vane and flow characteristic of pump were studied for intra-vane type pump. It is found that the amplitude of advance rising pressure of oil in working room was decreased after the rotor rotated 2° from the beginning of transition curve of vane pump when the big radius arc of vane pump stator curve was replaced by equal velocity curve. When the value of variable radius between the beginning and end of equal velocity curve was 0.1 mm, the contract force of vane could be decreased by 160 N and the rate of flow decreased by only 10-4 m3/s. So the improved stator curve has little influence on flow characteristic, and the condition of dynamics characteristic of vane can be improved, with which the abrasion of vane and noise of pump can be reduced.
  Number of references:11
  Main heading:Pumps
  Controlled terms:High pressure effects  -  Pile foundations  -  Stators  -  Vane pumps
  Uncontrolled terms:Contract force  -  Dynamics characteristic  -  Flow  -  Flow characteristic  -  On flow  -  Rotation angles  -  Transition curves  -  Variable radius  -  Velocity curves
  Classification code:483.2 Foundations  -  618.2 Pumps  -  705.1 Electric Machinery, General  -  931.2 Physical Properties of Gases, Liquids and Solids
  DOI:10.6041/j.issn.1000-1298.2012.01.039
  Database:Compendex

20. Accession number:20120614748664
  Title:Vehicle yaw stability control based on generalized predictive control
  Authors:Yang, Jiansen1 ; Li, Fei2 ; Ding, Haitao1 ; Guo, Konghui1 ; Hao, Baoqing3 
  Author affiliation:1  State Key Laboratory of Automobile Simulation and Control, Jilin University, Changchun 130025, China
                 2  Automotive Technology and Research Center, Tianjin 300162, China
                 3  Pan Asia Technical Automotive Center Co., Ltd., Shanghai 201201, China
  Corresponding author:Ding, H. ([email protected]) 
  Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
  Abbreviated source title:Nongye Jixie Xuebao
  Volume:43
  Issue:1
  Issue date:January 2012
  Publication year:2012
  Pages:1-5 36
  Language:Chinese
  ISSN:10001298
  CODEN:NUYCA3
  Document type:Journal article (JA)
  Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
  Abstract:The vehicle easily loses yaw stability in the emergency obstacle avoidance manoeuvre, and the vehicle yaw stability control can be accomplished by applying the vehicle additional yaw moment by means of four wheels differential braking. As the vehicle dynamic model is nonlinear and its parameters and environment is uncertainty, the vehicle additional yaw moment decided by the optimal control is always unable to maintain optimal in reality. The generalized predictive control (GPC) method was proposed for deciding the vehicle additional yaw moment. The nonlinear 7-DOF vehicle model was built as the predictive model, and its accuracy was verified by vehicle tests. The control performances of GPC method were verified by virtual tests in the Simulink/Carsim, test results showed that the GPC method was more effective than the LQR method in improving the vehicle active safety.
  Number of references:8
  Main heading:Vehicle wheels
  Controlled terms:Optimization  -  Predictive control systems  -  Stability  -  Vehicles
  Uncontrolled terms:Active safety  -  Control performance  -  Differential braking  -  Generalized predictive control  -  Generalized predictive control methods  -  Optimal controls  -  Predictive models  -  Simulink  -  Vehicle dynamic model  -  Vehicle model   -  Vehicle tests  -  Virtual tests  -  Yaw moment  -  Yaw stability  -  Yaw stability control
  Classification code:951 Materials Science  -  931 Classical Physics; Quantum Theory; Relativity  -  921.5 Optimization Techniques  -  961 Systems Science  -  801 Chemistry  -  601.2 Machine Components  -  432 Highway Transportation  -  731.1 Control Systems
  DOI:10.6041/j.issn.1000-1298.2012.01.001
  Database:Compendex

21. Accession number:20120614748690
  Title:Optimization of whole fat rapeseed expanding with response surface methodology
  Authors:Li, Shaohua1 ; Li, Shujun1 ; Ren, Jiajia1 ; Li, Ziming1 ; Xiang, Hai1 ; Guo, Jinqiang2 
  Author affiliation:1  Chinese Academy of Agricultural Mechanization Science, Beijing 100083, China
                 2  Xinshi Oil Stock Limited Company, Huzhou 313201, China
  Corresponding author:Li, S. ([email protected]) 
  Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
  Abbreviated source title:Nongye Jixie Xuebao
  Volume:43
  Issue:1
  Issue date:January 2012
  Publication year:2012
  Pages:153-157
  Language:Chinese
  ISSN:10001298
  CODEN:NUYCA3
  Document type:Journal article (JA)
  Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
  Abstract:The effect of die diameter, expanding temperature, feed rate, mass moisture content on the pre-pressed cake oil residue of rapeseed and the optimal conditions for lower cake oil residue were studied by response surface methodology. The results showed that pre-pressed cake oil residue was more significantly affected by the feed rate and mass moisture content, the pre-pressing cake oil residue was significantly affected by the die diameter; the pre-pressing cake oil residue was non-significant affected by expanding temperature. By frequency analysis, optimization of process parameters range is as follows: die hole diameter is 9.3~10 mm, expanding temperature is 95.3~98°C, feed rate is 33.6~35.1 t/h, material moisture content is 8.8%~9.5%. Under the condition of the parameters of the above mentioned, the residue oil content of pre-pressed cake is less than 13.5% as a possibility with 95% probability.
  Number of references:10
  Main heading:Surfaces
  Controlled terms:Moisture  -  Moisture determination  -  Oilseeds  -  Optimization  -  Surface properties
  Uncontrolled terms:Die diameter  -  Die hole  -  Feed-rates  -  Frequency Analysis  -  Oil residues  -  Optimal conditions  -  Optimization of process parameters  -  Rapeseed  -  Residue oil  -  Response Surface Methodology   -  Technology optimization  -  Whole fat expanding
  Classification code:801.4 Physical Chemistry  -  821.4 Agricultural Products  -  921.5 Optimization Techniques  -  931 Classical Physics; Quantum Theory; Relativity  -  944.2 Moisture Measurements  -  951 Materials Science
  DOI:10.6041/j.issn.1000-1298.2012.01.027
  Database:Compendex

22. Accession number:20120614748672
  Title:Dynamic stress of large double-suction centrifugal pump impeller
  Authors:Gao, Jiangyong1 ; Wang, Fujun1 ; Qu, Lixia1 ; Liu, Zhuqing1 ; Qi, Lanying2 
  Author affiliation:1  College of Water Conservancy and Civil Engineering, China Agricultural University, Beijing 100083, China
                 2  Beijing Institute of Water, Beijing 100044, China
  Corresponding author:Wang, F. ([email protected]) 
  Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
  Abbreviated source title:Nongye Jixie Xuebao
  Volume:43
  Issue:1
  Issue date:January 2012
  Publication year:2012
  Pages:42-47 52
  Language:Chinese
  ISSN:10001298
  CODEN:NUYCA3
  Document type:Journal article (JA)
  Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
  Abstract:The dynamic stress analysis for a large double-suction centrifugal pump impeller was presented by using the finite element method. This analysis was based on the sequential fluid-structure interaction theory. The pressure pulsation obtained from flow simulation by using CFD code was set as the force boundary condition. The dynamic stress characteristics of the impeller under five flow conditions (0.6Qd, 0.8Qd, Qd, 1.1Qd, 1.2Qd) were given. The results showed that the maximum stress of the impeller appeared at trailing edge or leading edge region of the blade near shroud. The stress distributions on impeller blade surfaces under different flow rate conditions are similar to each other. The level of dynamic stress under 0.6Qd is the highest. The dynamic stress varies periodically with the impeller rotating. It is also found that the fundamental frequencies of the dynamic stress are the rotating frequency and its harmonic frequency.
  Number of references:16
  Main heading:Dynamic analysis
  Controlled terms:Centrifugal pumps  -  Finite element method  -  Fluid structure interaction  -  Impellers  -  Pumps  -  Rotation  -  Stress analysis  -  Stress concentration
  Uncontrolled terms:Centrifugal pump impellers  -  CFD codes  -  Double-suction pump  -  Dynamic stress  -  Dynamic stress analysis  -  Finite Element  -  Flow condition  -  Flow rate conditions  -  Force boundary conditions  -  Fundamental frequencies   -  Harmonic frequency  -  Impeller blades  -  Leading edge  -  Maximum stress  -  Pressure pulsation  -  Rotating frequencies  -  Trailing edges
  Classification code:951 Materials Science  -  931.1 Mechanics  -  921.6 Numerical Methods  -  618.2 Pumps  -  601.2 Machine Components  -  601.1 Mechanical Devices  -  422.2 Strength of Building Materials : Test Methods  -  422 Strength of Building Materials; Test Equipment and Methods  -  421 Strength of Building Materials; Mechanical Properties
  DOI:10.6041/j.issn.1000-1298.2012.01.009
  Database:Compendex

23. Accession number:20120614748698
  Title:Matching method for quality knowledge in product designing process
  Authors:Mao, Jian1 ; Cao, Nailiang2 ; Cao, Yanlong3 ; Yang, Jiangxin3 
  Author affiliation:1  College of Mechanical Engineering, Shanghai University of Engineering Science, Shanghai 201620, China
                 2  Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China
                 3  Institute of Modern Manufacturing Engineering, Zhejiang University, Hangzhou 310027, China
  Corresponding author:Cao, Y. ([email protected]) 
  Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
  Abbreviated source title:Nongye Jixie Xuebao
  Volume:43
  Issue:1
  Issue date:January 2012
  Publication year:2012
  Pages:197-201
  Language:Chinese
  ISSN:10001298
  CODEN:NUYCA3
  Document type:Journal article (JA)
  Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
  Abstract:The design quality information and matching method based on semantic distance was presented in product designing process. Product design process was divided into five phases, and then the model of product design quality information was built. According to the model, the design task, designer and design quality information were analyzed. The task meta, object meta and information meta were described and the data structure was built. Using hierarchical network of concepts (HNC) and combining with semantic distance calculation, the quantification and comparing of text similarity can be realized based on framework of context text similarity. Finally, the conceptual design of injection molding machine was taken as an example, the result showed the effectiveness of the proposed method.
  Number of references:15
  Main heading:Product design
  Controlled terms:Conceptual design  -  Data structures  -  Injection molding  -  Quality control  -  Semantics
  Uncontrolled terms:Design Quality  -  Design tasks  -  Designing process  -  Hierarchical network  -  Knowledge matching  -  Matching methods  -  Quality knowledge  -  Semantic distance  -  Text similarity
  Classification code:408 Structural Design  -  723.3 Database Systems  -  816.1 Processing of Plastics and Other Polymers  -  903.2 Information Dissemination  -  913.1 Production Engineering  -  913.3 Quality Assurance and Control
  DOI:10.6041/j.issn.1000-1298.2012.01.035
  Database:Compendex

24. Accession number:20120614748685
  Title:Anaerobic initial adsorption and degradation of wood vinegar on activated sludge to produce methane
  Authors:Jiang, Enchen1 ; Chen, Liangguang1 ; Xiong, Leiming1 ; Zhao, Chuang1 ; Zhao, Zhiying2 
  Author affiliation:1  College of Engineering, South China Agricultural University, Guangzhou 510640, China
2 College of Agriculture, South China Agricultural University, Guangzhou 510640, China
　Corresponding author:Jiang, E. ([email protected]) 
  Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
  Abbreviated source title:Nongye Jixie Xuebao
  Volume:43
  Issue:1
  Issue date:January 2012
  Publication year:2012
  Pages:122-126
  Language:Chinese
  ISSN:10001298
  CODEN:NUYCA3
  Document type:Journal article (JA)
  Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
  Abstract:The utilization of wood vinegar, a by-product of biomass pyrolysis, treated as wastes of agriculture and forest, has been attracting increasing interests all over the world. The anaerobic initial adsorption and degradation of wood vinegar to produce methane was investigated by using the activated sludge. The results indicated that the pseudoequilibrium of the anaerobic initial adsorption could be established in 10 min and the rate of degradation was 15.6% while the physical adsorption played a significant role. Physical and biological adsorption was interacted after 10 min. Accompanied by the acidification, the content of acetic acid and propionic acid were increased resulted in the pH value decreased. The style of organic matter adsorbed and degraded was mainly on phenolic compounds detected by GC-MS technique. The adsorption can be well described by the Freundlich equilibrium model. Methane analyzed by GC technique was increased with the increasing initial volume fraction of wood vinegar. The way of anaerobic adsorption and degradation on the activated sludge is the new path to treat the wood vinegar.
  Number of references:21
  Main heading:Adsorption
  Controlled terms:Acetic acid  -  Degradation  -  Gas chromatography  -  Mass spectrometry  -  Methane  -  pH  -  Phenols  -  Pyrolysis  -  Waste utilization  -  Wood
  Uncontrolled terms:Activated sludge  -  Anaerobic  -  Biological adsorption  -  Biomass pyrolysis  -  Freundlich equilibrium  -  Initial adsorption  -  pH value  -  Phenolic compounds  -  Physical adsorption  -  Propionic acids   -  Pseudo-equilibrium
Classification code:811.2 Wood and Wood Products  -  804.1 Organic Compounds  -  802.3 Chemical Operations  -  802.2 Chemical Reactions  -  801.1 Chemistry, General  -  801 Chemistry  -  452.3 Industrial Wastes
  DOI:10.6041/j.issn.1000-1298.2012.01.022
  Database:Compendex

25. Accession number:20120614748699
  Title:Adaptive controller for parallel mechanism based on stability
  Authors:Lu, Kaijiang1, 2 ; Shi, Junping1 ; Dan, Bochou2 
  Author affiliation:1  School of Mechanical and Instrumental Engineering, Xi'an University of Technology, Xi'an 710048, China
                 2  Electromechanical Engineering Department, Baoji University of Arts and Sciences, Baoji 721016, China
  Corresponding author:Lu, K. ([email protected]) 
  Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
  Abbreviated source title:Nongye Jixie Xuebao
  Volume:43
  Issue:1
  Issue date:January 2012
  Publication year:2012
  Pages:202-207
  Language:Chinese
  ISSN:10001298
  CODEN:NUYCA3
  Document type:Journal article (JA)
  Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
  Abstract:The strategy was proposed based on model and reference to adaptive control according to the properties of parameter variations and unpredictable, un-modeled error in parallel mechanism. Parameter variations and un-modeled error of mechanism system were treated as a disturbance to the practical system, an ideal reference model was established, and adaptive feedback rule was constructed depend on system status and the error. The adaptive control rule was derived by stability theory, and the practical mechanism had the same dynamic characteristics as parameter model. Example showed that adaptive controller could effectively restrain motion error which caused by parameter variations and un-modeled error, the mechanism has high tracking precision to planed target movement.
  Number of references:18
  Main heading:Model reference adaptive control
  Controlled terms:Control theory  -  Controllers  -  Convergence of numerical methods  -  Mechanisms
  Uncontrolled terms:Adaptive Control  -  Adaptive controllers  -  Adaptive feedback  -  Dynamic characteristics  -  Motion errors  -  Parallel mechanisms  -  Parameter model  -  Parameter variation  -  Practical systems  -  Reference models   -  Stability theories  -  System status  -  Target movements  -  Tracking precision
  Classification code:601.3 Mechanisms  -  731.1 Control Systems  -  732.1 Control Equipment  -  921.6 Numerical Methods
  DOI:10.6041/j.issn.1000-1298.2012.01.036
  Database:Compendex

26. Accession number:20120614748689
  Title:Applications of internet of things in food and agri-food areas
  Authors:Liu, Donghong1 ; Zhou, Jianwei1, 2 ; Mo, Lingfei1 
  Author affiliation:1  School of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310029, China
                 2  Ningbo Institute of Technology, Zhejiang University, Ningbo 315100, China
  Corresponding author:Liu, D. ([email protected]) 
  Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
  Abbreviated source title:Nongye Jixie Xuebao
  Volume:43
  Issue:1
  Issue date:January 2012
  Publication year:2012
  Pages:146-152
  Language:Chinese
  ISSN:10001298
  CODEN:NUYCA3
  Document type:Journal article (JA)
  Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
  Abstract:With in-depth development of the technologies of internet of things (IOT), they have been increasingly applied in food and agri-food areas. The RFID (radio frequency identification) and WSN (wireless sensor networks) in principles, techniques and other related information were introduced, a more comprehensive summarization and analysis of these technologies and applications in agricultural and food industry during recent years were given, such as food processing, food-safety control, the food supply chain traceability and tracking, etc. The problems and solutions were also discussed. Furthermore, suggestions for future research and application areas were put forward.
  Number of references:46
  Main heading:Food safety
  Controlled terms:Accident prevention  -  Food processing  -  Food supply  -  Internet  -  Processed foods  -  Radio frequency identification (RFID)  -  Radio waves  -  Sensors  -  Supply chains  -  Wireless sensor networks
  Uncontrolled terms:Agri-food  -  Food  -  Food industries  -  Internet of things  -  Research and application  -  WSN (wireless sensor networks)
  Classification code:914.1 Accidents and Accident Prevention  -  913 Production Planning and Control; Manufacturing  -  912 Industrial Engineering and Management  -  822.3 Food Products  -  822.2 Food Processing Operations  -  801 Chemistry  -  732 Control Devices  -  723 Computer Software, Data Handling and Applications  -  718 Telephone Systems and Related Technologies; Line Communications  -  717 Optical Communication  -  716.3 Radio Systems and Equipment  -  716 Telecommunication; Radar, Radio and Television  -  711 Electromagnetic Waves
  DOI:10.6041/j.issn.1000-1298.2012.01.026
  Database:Compendex

27. Accession number:20120614748670
  Title:Steady-state temperature measurement on the CNG engine piston
  Authors:Zhang, Zhiyong1 ; Huang, Ronghua1 ; Wang, Zhaowen1 ; Cheng, Wei2 
  Author affiliation:1  School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
                 2  Engine Department of Dongfeng Commercial Vehicle Technical Center, Wuhan 430056, China
  Corresponding author:Huang, R. ([email protected]) 
  Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
  Abbreviated source title:Nongye Jixie Xuebao
  Volume:43
  Issue:1
  Issue date:January 2012
  Publication year:2012
  Pages:33-36
  Language:Chinese
  ISSN:10001298
  CODEN:NUYCA3
  Document type:Journal article (JA)
  Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
  Abstract:A set of steady temperature measurement device was developed. A high accuracy of ±1°C could be obtained by the system as long as the error was calibrated. The piston temperature was measured at the engine speeds of 1000 r/min, 1500 r/min and 2100 r/min on the external characteristics of the engine of EQD180N-20, respectively. The piston temperature variation test was performed from 1000 r/min to 2100 r/min simultaneously. The results show that the proposed system is stable and reliable. On the external characteristics, the temperature of each feature point increased firstly and then declined slightly as the engine speed increased, and a maximum value was observed at 1500 r/min; on the stable working condition, the highest temperature appeared in the piston top surface with a value of 264°C, The first piston ring slot temperature is about 215°C.
  Number of references:7
  Main heading:Engine pistons
  Controlled terms:Engines  -  Piston rings  -  Pistons  -  Temperature measurement
  Uncontrolled terms:Engine speed  -  External characteristic  -  Highest temperature  -  Maximum values  -  Piston temperature  -  Steady-state temperature  -  Top surface  -  Working conditions
  Classification code:612 Engines  -  612.1.1 Internal Combustion Engine Components  -  944.6 Temperature Measurements
  DOI:10.6041/j.issn.1000-1298.2012.01.007
  Database:Compendex

28. Accession number:20120614748678
  Title:Influence of superabsorbent polymers on sandy soil physical properties and corn growth
  Authors:Li, Yang1 ; Wang, Baitian1 
  Author affiliation:1  College of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China
  Corresponding author:Wang, B. ([email protected]) 
  Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
  Abbreviated source title:Nongye Jixie Xuebao
  Volume:43
  Issue:1
  Issue date:January 2012
  Publication year:2012
  Pages:76-82
  Language:Chinese
  ISSN:10001298
  CODEN:NUYCA3
  Document type:Journal article (JA)
  Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
  Abstract:Four typical superabsorbent polymers were tested to study their impact on the physical properties of sandy soil and the growth of corn. Results showed that superabsorbent polymers evidently ameliorated soil water characteristics. Concentration of SAP from 0.50% to 1.00% had a typical significance to Ordos sandy soil. Superabsorbent polymers effectively improved the water holding capacity of soil, and the ameliorating effect in low soil water suctions(<0.8 MPa) obviously superior to the high soil water suctions(>0.8 MPa). In terms of soil available water of Ordos sandy soil, polymers of polyacrylate had better performance than polymers of polyacrylamide in lower SAP concentrations (<0.5%), while in the higher SAP concentrations (>0.5%) is the opposite. Soil bulk densities were decreased with the increase of concentration of superabsorbent polymers. Soil total porosities were increased with the increase of concentration of superabsorbent polymers. The survival time of maize was longer when the amounts of superabsorbent polymer were higher.
  Number of references:22
  Main heading:Polymers
  Controlled terms:Physical properties  -  Polyacrylates  -  Sand  -  Soil moisture
  Uncontrolled terms:Corn  -  Soil bulk density  -  Soil water  -  Soil water characteristic curve  -  Superabsorbent polymer
  Classification code:483.1 Soils and Soil Mechanics  -  815.1 Polymeric Materials  -  815.1.1 Organic Polymers  -  931.2 Physical Properties of Gases, Liquids and Solids
  DOI:10.6041/j.issn.1000-1298.2012.01.015
  Database:Compendex

29. Accession number:20120614748673
  Title:Numerical simulation and experiment of latin square design on non-overload vortex pump
  Authors:Wang, Xiuli1 ; Zhu, Rongsheng1 ; Su, Baowen1 ; Yu, Zhijun2 
  Author affiliation:1  Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang 212013, China
                 2   Jiangsu Zhenhua Pump Manufacturing Co., Ltd., Taizhou 225500, China
  Corresponding author:Wang, X. ([email protected]) 
  Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
  Abbreviated source title:Nongye Jixie Xuebao
  Volume:43
  Issue:1
  Issue date:January 2012
  Publication year:2012
  Pages:48-52
  Language:Chinese
  ISSN:10001298
  CODEN:NUYCA3
  Document type:Journal article (JA)
  Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
  Abstract:The optimization design of vortex pump impeller parameter was done by using the orthogonal design method. Orthogonal scheme of five factors and two levels was designed, and the influence of geometrical parameters on the characteristics was studied. Reynolds averaged Navier-Stokes method was adopted to simulate every set of parameters obtained by the orthogonal design method. Optimal scheme of the characteristics was found by analyzing the contrast of performance curves. The influence orders of geometrical parameters to the characteristics were obtained with range analysis. The optimization parameter combination was obtained with comprehensive balance analysis and comparison to the data result. Meanwhile, the optimized design scheme was determined, and corresponding test was carried out. It demonstrated that the experimental purpose was reached, the design method was reasonable, and it had the property of both high efficiency and non-overload.
  Number of references:12
  Main heading:Design
  Controlled terms:Computer simulation  -  Impellers  -  Numerical methods  -  Optimization  -  Pumps  -  Vortex flow
  Uncontrolled terms:Balance analysis  -  Design method  -  Geometrical parameters  -  Latin square design  -  Non-overload  -  Optimal scheme  -  Optimization design  -  Optimization parameter  -  Optimized designs  -  Orthogonal design method   -  Performance curve  -  Range analysis  -  Reynolds-Averaged Navier-Stokes  -  Vortex pump  -  Vortex pumps
  Classification code:921.6 Numerical Methods  -  921.5 Optimization Techniques  -  723.5 Computer Applications  -  631.1 Fluid Flow, General  -  618.2 Pumps  -  601.2 Machine Components  -  408 Structural Design
  DOI:10.6041/j.issn.1000-1298.2012.01.010
  Database:Compendex

30. Accession number:20120614748704
  Title:Design and experiment of bionic food texture analyzer
  Authors:Sun, Zhonglei1, 2 ; Sun, Yonghai1 ; Li, Yu2 ; Liu, Jingjing1 ; Li, Junxing3 
  Author affiliation:1  College of Biological and Agricultural Engineering, Jilin University, Changchun 130025, China
                 2  Department of Life Science and Technology, Yangtze Normal University, Chongqing 408100, China
                 3  Jilin Provincial Academy of Agricultural Machinery, Changchun 130025, China
  Corresponding author:Sun, Y. ([email protected]) 
  Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
  Abbreviated source title:Nongye Jixie Xuebao
  Volume:43
  Issue:1
  Issue date:January 2012
  Publication year:2012
  Pages:230-234
  Language:Chinese
  ISSN:10001298
  CODEN:NUYCA3
  Document type:Journal article (JA)
  Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
  Abstract:The bionic chewing equipment and parodontium were designed by bionic technology and two stages, a signal amplifying circuit was made, the testing software was developed by Visual C , and then the bionic food texture analyzer was set up. Apples and carrots were measured by using this texture analyzer and the corresponding experiments were done and results were contrasted with those from panelists and the universal food texture analyzer. Pearson correlation coefficients showed that test values of the bionic food texture analyzer and sensory evaluation had a good relationship, the correlation coefficients with apple's hardness, crunchiness were 0.970, 0.904, and with carrot's hardness, crunchiness were 0.961, 0.971. The data are better than the coefficients from the universal food texture analyzer and sensory evaluation.
  Number of references:12
  Main heading:Textures
  Controlled terms:Bionics  -  Correlation methods  -  Experiments  -  Fruits  -  Hardness  -  Software testing
  Uncontrolled terms:Amplifying circuits  -  Correlation coefficient  -  Food texture  -  Pearson correlation coefficients  -  Sensory evaluation  -  Testing software  -  Texture analyzer  -  Texture analyzers  -  Two stage  -  VISUAL C
  Classification code:933 Solid State Physics  -  922.2 Mathematical Statistics  -  901.3 Engineering Research  -  951 Materials Science  -  821.4 Agricultural Products  -  723.5 Computer Applications  -  421 Strength of Building Materials; Mechanical Properties  -  731.1 Control Systems
  DOI:10.6041/j.issn.1000-1298.2012.01.041
  Database:Compendex

31. Accession number:20120614748683
  Title:Effects of different materials addition on the aerobic composting
  Authors:Yuan, Qiaoxia1 ; Tian, Chunyan1 ; Chen, Gang2 ; Zhong, Hui1 ; Lin, Guiying1 
  Author affiliation:1  College of Engineering, Huazhong Agricultural University, Wuhan 430070, China
                  2  Wuhan Institute of Agricultural Sciences, Wuhan 430052, China
  Corresponding author:Yuan, Q. ([email protected]) 
  Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
  Abbreviated source title:Nongye Jixie Xuebao
  Volume:43
  Issue:1
  Issue date:January 2012
  Publication year:2012
  Pages:108-114
  Language:Chinese
  ISSN:10001298
  CODEN:NUYCA3
  Document type:Journal article (JA)
  Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
  Abstract:Wheat straw, corn stover, and saw dust were added into the main composting material, swine manure, respectively to study the effects on the aerobic composting. Dry weight of each material was 10%, 15% and 20% of the total dry weight respectively. The piles were turned over once every 5 days by labor. By the comprehensive research, the composting with materials of wheat straw and corn straw were better than others. The result showed adding more corn straw could get better effect, increasing the proportion of corn straw (when the proportion of corn straw reached 20%) can gain better composting effect than adding wheat straw, while the best proportion of wheat straw was 15%, under that condition, the best effect of composting could be obtained. The composting with litter ration of saw dust was relatively poor.
  Number of references:33
  Main heading:Manures
  Controlled terms:Dust
  Uncontrolled terms:Aerobic composting  -  Comprehensive research  -  Corn stover  -  Corn straws  -  Dry weight  -  Swine manure  -  Wheat straws
  Classification code:451.1 Air Pollution Sources  -  452.3 Industrial Wastes
  DOI:10.6041/j.issn.1000-1298.2012.01.020
  Database:Compendex

32. Accession number:20120614748666
  Title:Numerical investigation on transient oil-filling process of hydraulic retarder
  Authors:Yan, Qingdong1 ; Zou, Bo1 ; Wei, Wei1 ; Yu, Tao1 
  Author affiliation:1  School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China
  Corresponding author:Yan, Q. ([email protected]) 
  Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
  Abbreviated source title:Nongye Jixie Xuebao
  Volume:43
  Issue:1
  Issue date:January 2012
  Publication year:2012
  Pages:12-17
  Language:Chinese
  ISSN:10001298
  CODEN:NUYCA3
  Document type:Journal article (JA)
  Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
  Abstract:With the aim to obtain the time-varying braking performance of emergency oil-filling process of hydraulic retarder, a numerical simulation model of flow channel was established based on transient CFD method. The inlet velocity, outlet velocity and a steady flow field result were calculated and applied as the boundary condition and initial condition. Then the transient simulation of emergency oil-filling process was calculated when the initial rotor rotating speed was 2 640 r/min. The pressure, the velocity and the turbulence kinetic energy distribution of internal flow field under different braking time were studied, and the time-varying braking torque was calculated by CFD post-processing analysis. Comparison of the experimental data and simulation results showed that the calculation tolerance of the braking torque was 12.7%. It is indicated that the simulation method and model are accurate and reliable, and the transient simulation method is more appropriate to predict the time-varying braking performance of hydraulic retarder.
  Number of references:7
  Main heading:Computer simulation
  Controlled terms:Brakes  -  Computational fluid dynamics  -  Filling  -  Flow fields  -  Inlet flow  -  Numerical methods  -  Steady flow  -  Time varying systems
  Uncontrolled terms:Braking performance  -  Braking torque  -  CFD method  -  CFD post-processing  -  Experimental data  -  Flow channels  -  Hydraulic retarder  -  Initial conditions  -  Inlet velocity  -  Internal flow field   -  Numerical investigations  -  Numerical simulation models  -  Outlet velocities  -  Rotating speed  -  Simulation methods  -  Time varying  -  Transient flow field  -  Transient simulation  -  Turbulence kinetic energy
  Classification code:602 Mechanical Drives and Transmissions  -  631.1 Fluid Flow, General  -  691.2 Materials Handling Methods  -  723.5 Computer Applications  -  921.6 Numerical Methods  -  961 Systems Science
  DOI:10.6041/j.issn.1000-1298.2012.01.003
  Database:Compendex

33. Accession number:20120614748668
  Title:Vision-based self-localization method for underground mining vehicle
  Authors:Meng, Yu1 ; Liu, Li1 ; Ma, Fei1 ; Gan, Nan1 ; Fu, Xianjie1 
  Author affiliation:1  School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, China
  Corresponding author:Meng, Y. ([email protected]) 
  Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
  Abbreviated source title:Nongye Jixie Xuebao
  Volume:43
  Issue:1
  Issue date:January 2012
  Publication year:2012
  Pages:22-27
  Language:Chinese
  ISSN:10001298
  CODEN:NUYCA3
  Document type:Journal article (JA)
  Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
  Abstract:A vision-based self-localization method was proposed for underground mining vehicle by using landmarks. Firstly, several artificial landmarks were located in a simulating tunnel, and then a vision sensor in vehicle was used to find and recognize them. After the distances between the vehicle and the recognized landmarks were calculated by a visual distance measurement method, the location of the vehicle was computed according to triangulation finally. In this self-localization method, landmarks were encoded by interleaved 2 of 5, a type of 1-D barcode with high density. Each landmark has obvious visual feature and there is a unique corresponding location data to it in the landmark database. Distance between a landmark and the vehicle was calculated on the basis of the ratio of the coding area's actual height to its height in the image according to the pinhole imaging principle. Experimental results showed that the self-localization method suggested almost meets the requirement for autonomous driving vehicle because of its high efficiency and precision.
  Number of references:13
  Main heading:Underground mine transportation
  Controlled terms:Bar codes  -  Image coding  -  Vehicles
  Uncontrolled terms:Artificial landmark  -  Autonomous driving  -  High density  -  In-vehicle  -  Landmark database  -  Landmark recognition  -  Location data  -  Mining vehicle  -  Pinhole imaging  -  Self-localization   -  Self-localization methods  -  Underground mining  -  Vision based  -  Vision sensors  -  Visual feature
  Classification code:432 Highway Transportation  -  502.2 Mine and Quarry Equipment  -  723.2 Data Processing and Image Processing
  DOI:10.6041/j.issn.1000-1298.2012.01.005
  Database:Compendex

34. Accession number:20120614748676
  Title:Response models for soil water repellency and soil moisture
  Authors:Chen, Junying1, 2 ; Wu, Pute1 ; Zhang, Zhitao1 ; Oron, Gideon3 ; Wang, Zhinong1 
  Author affiliation:1  College of Water Resources and Architectural Engineering, Northwest A and F University, Yangling, Shaanxi 712100, China
                 2  Institute of Soil and Water Conservation, CAS and MWR, Yangling, Shaanxi 712100, China
                 3  J. Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Sede Boker 84990, Israel
  Corresponding author:Wu, P. ([email protected]) 
  Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
  Abbreviated source title:Nongye Jixie Xuebao
  Volume:43
  Issue:1
  Issue date:January 2012
  Publication year:2012
  Pages:63-67 82
  Language:Chinese
  ISSN:10001298
  CODEN:NUYCA3
  Document type:Journal article (JA)
  Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
  Abstract:The relationships between the soil water repellency and soil moisture were studied by measuring WDPT using 10 different water repellent soils collected from Israel. A single peak curve correlation of the relationships between the WDPT and soil moisture was obtained after analysis. Three mathematic models, namely Gaussian, Lorentzian and Lognormal distributions were used for fitting the models by regression analysis, and the Lorentzian distribution was found to be the best model for the practical use. The peak soil moisture, the peak WDPT and the critical soil moisture can be computed by the model of part measured WDPT and soil moisture. It can provide the theory for amelioration of soil and compare of the different repellent soils.
  Number of references:14
  Main heading:Geologic models
  Controlled terms:Regression analysis  -  Soil moisture
  Uncontrolled terms:Best model  -  Gaussians  -  Log-normal distribution  -  Lorentzian distributions  -  Mathematic model  -  Regression  -  Response model  -  Single peak  -  Soil water repellency  -  Water repellent soils
  Classification code:481.1 Geology  -  483.1 Soils and Soil Mechanics  -  922.2 Mathematical Statistics
  DOI:10.6041/j.issn.1000-1298.2012.01.013
  Database:Compendex

35. Accession number:20120614748693
  Title:Robot monte carlo self-localization method based on combination of vision sensors and laser range finder
  Authors:Li, Yongjian1 
  Author affiliation:1  Department of Electric and Information Engineering, Hunan Institute of  Engineering, Xiangtan 411104, China
  Corresponding author:Li, Y. ([email protected]) 
  Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
  Abbreviated source title:Nongye Jixie Xuebao
  Volume:43
  Issue:1
  Issue date:January 2012
  Publication year:2012
  Pages:170-174
  Language:Chinese
  ISSN:10001298
  CODEN:NUYCA3
  Document type:Journal article (JA)
  Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
  Abstract:With the aim to deal with the localization disadvantage of robot equipped with only single class sensor, a novel mobile robot particle filter self-localization method based on combination of the heterogeneous sensors was proposed. Perception model of LRF (laser range finder sensor) and monocular camera were established, and self-localization was achieved after the particle sets had been updated with fusion perception information. The experimental results showed that characteristics of fast and accurate updates of LRF and global of monocular camera was fully utilized, convergence time of particle sets was reduced by 14.3% than using a single class of sensor, and mobile robot located accuracy was improved by 16.7%.
  Number of references:14
  Main heading:Computer vision
  Controlled terms:Cameras  -  Information fusion  -  Mobile robots  -  Monte Carlo methods  -  Nonlinear filtering  -  Radar equipment  -  Sensors  -  Target tracking
  Uncontrolled terms:Convergence time  -  Heterogeneous sensors  -  Laser range finder  -  Laser range finders  -  Monocular cameras  -  MONTE CARLO  -  Particle filter  -  Perception model  -  Self-localization  -  Self-localization methods   -  Vision sensors
  Classification code:903.1 Information Sources and Analysis  -  801 Chemistry  -  742.2 Photographic Equipment  -  922.2 Mathematical Statistics  -  731.5 Robotics  -  723.5 Computer Applications  -  716.2 Radar Systems and Equipment  -  731.1 Control Systems
  DOI:10.6041/j.issn.1000-1298.2012.01.030
  Database:Compendex

36. Accession number:20120614748671
  Title:Cavitation performance of the low specific-speed centrifugal pump with radial reflux balance hole
  Authors:Cao, Weidong1 ; Zhang, Xiaodi1 ; Gao, Yi1 ; Wang, Xiulan1 
  Author affiliation:1  Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang 212013, China
  Corresponding author:Cao, W. ([email protected]) 
  Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
  Abbreviated source title:Nongye Jixie Xuebao
  Volume:43
  Issue:1
  Issue date:January 2012
  Publication year:2012
  Pages:37-41
  Language:Chinese
  ISSN:10001298
  CODEN:NUYCA3
  Document type:Journal article (JA)
  Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
  Abstract:The low specific-speed centrifugal pump with the specific speed of 26 was selected to be the numerical model. Under the condition of other geometric parameters of the volute and impeller maintained constant, the radial reflux balance hole, the traditional axial balance hole and none balance hole were designed to couple with the low-specific centrifugal impeller respectively. Based on the continuity equation, momentum equation, standard k-Ε turbulence model, homogeneous multiphase model and Rayleigh-Plesset equation, the cavitation performances of the pump with different reflux balance holes were simulated. The trend of simulated H-LNPSHa curves were consistent with the experimental data, in addition, the accuracy of numerical simulation was also verified. The results showed that with equipped radial reflux balance hole, the anti-cavitation performance of the pump can be improved obviously due to the coincidence between the balance-hole backflow with impeller inflow.
  Number of references:9
  Main heading:Computer simulation
  Controlled terms:Cavitation  -  Centrifugal pumps  -  Centrifugation  -  Impellers  -  Pumps  -  Turbulence models
  Uncontrolled terms:Backflow  -  Cavitation performance  -  Centrifugal impeller  -  Continuity equations  -  Experimental data  -  Geometric parameter  -  Low specific-speed  -  Momentum equation  -  Multiphase model  -  Numerical models   -  Radial reflux balance hole  -  Rayleigh-Plesset equation  -  Specific speed
  Classification code:601.2 Machine Components  -  618.2 Pumps  -  631.1 Fluid Flow, General  -  631.1.1 Liquid Dynamics  -  723.5 Computer Applications  -  802.3 Chemical Operations
  DOI:10.6041/j.issn.1000-1298.2012.01.008
  Database:Compendex

37. Accession number:20120614748680
  Title:Winter wheat yield forecast multi-stage model
  Authors:He, Yajuan1, 2 ; Wang, Qingfa1 ; Pei, Zhiyuan1 ; Wang, Lianlin3 ; Ma, Zhiping3 ; Pan, Xuebiao2 
  Author affiliation:1  Chinese Academy of Agricultural Engineering, Beijing 100125, China
                 2  College of Resources and Environmental Sciences, China Agricultural University, Beijing 100094, China
                 3  Development Planning Board of Yutian County, Tangshan 064100, China
  Corresponding author:Pei, Z. ([email protected]) 
  Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
  Abbreviated source title:Nongye Jixie Xuebao
  Volume:43
  Issue:1
  Issue date:January 2012
  Publication year:2012
  Pages:89-93 133
  Language:Chinese
  ISSN:10001298
  CODEN:NUYCA3
  Document type:Journal article (JA)
  Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
  Abstract:In order to search for more timeliness and accuracy of forecasting methods, Yutian County, Hebei Province was chosen as the pilot site. A three-year field experiments were conducted on winter wheat. During different growing periods, three yield-contribution factors were measured in situ and the analysis was done. The results revealed that single-factor model of application allowed the prediction of time ahead of winter wheat yield to the heading stage; the prediction accuracy can reach to 88%. Prediction of two-factor model can be advanced to the heading stage to the early filling stage, and the AI is more than 90%. This study provided an effective method namely the multi-stage prediction model to effectively predict crop yield. It can overcome the regular operation problems and provide important references for agriculture warning system by remoter sensing at all levels of agricultural crop production forecast.
  Number of references:18
  Main heading:Forecasting
  Controlled terms:Crops  -  Cultivation  -  Mathematical models
  Uncontrolled terms:Agricultural crops  -  Crop yield  -  Field experiment  -  Filling stage  -  Forecasting methods  -  Growing period  -  Hebei Province  -  In-situ  -  Multi-stage  -  Multi-stage models   -  Multi-stage production estimation model  -  Prediction accuracy  -  Prediction model  -  Production component  -  Regular operations  -  Winter wheat
  Classification code:821.3 Agricultural Methods  -  821.4 Agricultural Products  -  921 Mathematics
  DOI:10.6041/j.issn.1000-1298.2012.01.017
  Database:Compendex

38. Accession number:20120614748674
  Title:Numerical simulation of interflow field in centrifugal pump with double curvature blade
  Authors:Wang, Yang1 ; Li, Minmin1 ; Zhang, Wenjing1 ; Jiang, Qisong1 
  Author affiliation:1  Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang 212013, China
  Corresponding author:Wang, Y. ([email protected]) 
  Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
  Abbreviated source title:Nongye Jixie Xuebao
  Volume:43
  Issue:1
  Issue date:January 2012
  Publication year:2012
  Pages:53-57
  Language:Chinese
  ISSN:10001298
  CODEN:NUYCA3
  Document type:Journal article (JA)
  Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
  Abstract:The steady and unsteady interflow fields in centrifugal pump with double curvature blade were investigated by CFD, which was compared with general centrifugal pump in the same design parameters. The characteristic of interflow fields and pressure fluctuations at different monitoring points were obtained. The results showed that it can prevent the impeller from emerging and developing wake flow in double curvature blade centrifugal pump. The main factor which created the pressure fluctuation in the pump was the interaction between the impeller and the tongue, and with the flow rate increased, the pressure fluctuations at the tongue were getting bigger. At the same flow rate, the pressure fluctuation's amplitude value on double curvature blade type centrifugal pump was smaller than the ordinary centrifugal pump, which reduced the pump's hydraulic loss to some extent. The results are served as the theory basis in optimization of pump structure and reduction of pump's noise and vibration.
  Number of references:10
  Main heading:Pumps
  Controlled terms:Centrifugal pumps  -  Computer simulation  -  Flow rate  -  Impellers  -  Structural optimization
  Uncontrolled terms:Design parameters  -  Double curvature  -  Hydraulic loss  -  Interflow  -  Monitoring points  -  Noise and vibration  -  Pressure fluctuation  -  Pump structure  -  Wake flows
  Classification code:601.2 Machine Components  -  618.2 Pumps  -  631 Fluid Flow  -  723.5 Computer Applications  -  921.5 Optimization Techniques
  DOI:10.6041/j.issn.1000-1298.2012.01.011
  Database:Compendex

39. Accession number:20120614748687
  Title:Microarray analysis of gene expression profile induced by postharvest UV-C irradiation in tomato fruit
  Authors:Liu, Changhong1 ; Cai, Luyun1 ; Han, Xiaoxu1 ; Ying, Tiejin1 
  Author affiliation:1  School of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310058, China
  Corresponding author:Ying, T. ([email protected]) 
  Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
  Abbreviated source title:Nongye Jixie Xuebao
  Volume:43
  Issue:1
  Issue date:January 2012
  Publication year:2012
  Pages:134-140
  Language:Chinese
  ISSN:10001298
  CODEN:NUYCA3
  Document type:Journal article (JA)
  Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
  Abstract:To obtain an overall view on transcript modification during the tomato fruit in response to postharvest UV-C irradiation (4 kJ/m2), a microarrary analysis was performed by using Affymetrix tomato genechip arrays. The results showed that 331 and 150 genes were up- or down-regulated, respectively, more than two folds in postharvest UV-C irradiated tomato fruit as compared with that in control fruit. The up-regulated genes mainly involved cell wall related, signal transduction, stress related and defense response. Conversely, genes related to ethylene and primary metabolism were generally down-regulated. These results opened ways to probe into the molecular mechanisms of the effects of postharvest UV-C irradiation on increasing disease resistance, delaying ripening and prolonging postharvest life in tomato fruit.
  Number of references:17
  Main heading:Fruits
  Controlled terms:Energy storage  -  Ethylene  -  Gene expression  -  Irradiation  -  Metabolism  -  Signal transduction
  Uncontrolled terms:Affymetrix  -  Cell walls  -  Defense response  -  Disease resistance  -  Gene expression profiles  -  Genechips  -  In-control  -  Microarray analysis  -  Molecular mechanism  -  Postharvest   -  Tomato fruits  -  UV-C
  Classification code:461.9 Biology  -  702 Electric Batteries and Fuel Cells  -  711.1 Electromagnetic Waves in Different Media  -  804.1 Organic Compounds  -  821.4 Agricultural Products
  DOI:10.6041/j.issn.1000-1298.2012.01.024
  Database:Compendex

40. Accession number:20120614748700
  Title:Optimal synthesis of adjustable spherical four-bar mechanisms for function generation
  Authors:Wang, Mei1 ; Liu, Rui2 ; Yang, Suixian1 
  Author affiliation:1  School of Manufacturing Science and Engineering, Sichuan University, Chengdu 610065, China
                 2  Nuclear and Radiation Safety Center, Ministry of Environmental Protection, Beijing 100082, China
  Corresponding author:Wang, M. ([email protected]) 
  Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
  Abbreviated source title:Nongye Jixie Xuebao
  Volume:43
  Issue:1
  Issue date:January 2012
  Publication year:2012
  Pages:208-212
  Language:Chinese
  ISSN:10001298
  CODEN:NUYCA3
  Document type:Journal article (JA)
  Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
  Abstract:An optimal synthesis method of adjustable spherical four-bar mechanisms for multi-function generation was put forward. Different functions can be generated by the same mechanism through adjusting the length of the connecting frame poles. Based on the function relation between the input angle and the output angle of the spherical four-bar mechanism, the optimization model was established. The objective function was given with the aim of minimizing the maximum of the absolute structural error, and the constraints were given to ensure the crack existed and that the mechanisms have good transmission quality. After this, the immune genetic algorithm was chosen for multi-function generation of adjustable spherical four-bar mechanisms. The result of the synthesis example verified the effectiveness of the proposed method.
  Number of references:12
  Main heading:Spheres
  Controlled terms:Bars (metal)  -  Genetic algorithms  -  Mechanical engineering  -  Mechanisms  -  Optimization
  Uncontrolled terms:Adjustable mechanisms  -  Four-bar mechanisms  -  Function generation  -  Immune genetic algorithms  -  Multi-functions  -  Objective functions  -  Optimal synthesis  -  Optimization models  -  Spherical four-bar mechanisms  -  Structural errors   -  Transmission quality
  Classification code:921.5 Optimization Techniques  -  921 Mathematics  -  723 Computer Software, Data Handling and Applications  -  631 Fluid Flow  -  608 Mechanical Engineering, General  -  601.3 Mechanisms  -  535.1.2 Rolling Mill Practice
  DOI:10.6041/j.issn.1000-1298.2012.01.037
  Database:Compendex

41. Accession number:20120614748703
  Title:Finite element analysis of dragonfly wing structural stiffness
  Authors:Shi, Xiaojun1, 2 ; Yu, Haiye1 
  Author affiliation:1  Department of Biological and Agricultural Engineering, Jilin University, Changchun 130025, China
                  2  Department of Mechanical and Electrical Engineering, Jilin Institute of Economic Management, Changchun 130012, China
  Corresponding author:Yu, H. ([email protected]) 
  Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
  Abbreviated source title:Nongye Jixie Xuebao
  Volume:43
  Issue:1
  Issue date:January 2012
  Publication year:2012
  Pages:224-229 223
  Language:Chinese
  ISSN:10001298
  CODEN:NUYCA3
  Document type:Journal article (JA)
  Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
  Abstract:The dragonfly wings were taken as the study objects, CAD and finite element analysis software ANSYS were applied to establish the finite element model of dragonfly wings. Through static analysis, the main vein structure was determined as load-bearing structure in dragonfly wings, the main vein and secondary veins coordinating so as to make the overall structure more reasonable. According to the characteristics of dragonfly wings wrinkled structure, the mesh model of rectangular and staggered quadrilateral fold structure was established, different mechanical properties under load were analyzed. The results showed that under the same uniform load, the greater the height of wrinkling was, the smaller structural deformation, and the greater structural stiffness would be. The analysis of quadrilateral mesh (no membrane) model in a different uniform deformation under load of the trend can be seen in the same wrinkle height, as the load increased, the deformation also increased, but as the wrinkle height increased, and with the smaller amount of deformation of the load increased, the quadrilateral mesh stiffness of the structure became slightly larger than staggered quadrilateral mesh structure. Under the same load, the deformation of a membrane mesh structure was always less than no membrane mesh structure.
  Number of references:11
  Main heading:Finite element method
  Controlled terms:Computer aided design  -  Deformation  -  Mechanical properties  -  Static analysis  -  Stiffness  -  Structural analysis
  Uncontrolled terms:Finite Element  -  Finite element analysis software  -  Finite element models  -  Fold structures  -  Loadbearing structure  -  Mesh model  -  Mesh structures  -  Quadrilateral meshes  -  Secondary veins  -  Structural deformation   -  Structural stiffness  -  Uniform deformation  -  Uniform loads
  Classification code:408.1 Structural Design, General  -  421 Strength of Building Materials; Mechanical Properties  -  422 Strength of Building Materials; Test Equipment and Methods  -  723.5 Computer Applications  -  921.6 Numerical Methods  -  951 Materials Science
  DOI:10.6041/j.issn.1000-1298.2012.01.040
  Database:Compendex
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