2008年第39卷第11期共收錄44篇
1.Accession number:085011777175
Title:PIV measurement of flow with salt-out in centrifugal pump
Authors:Liu, Dong; Yang, Minguan; Gao, Bo
Author affiliation:Jiangsu University, Zhenjiang 212013, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 11
Issue date:November 2008
Publication year:2008
Pages:p 55-58 63
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract:Advanced flow measurement equipment PIV (particle image velocimetry) was adopted to measure the internal salt-out flow in an innovated centrifugal pump. The synchronization problem during measurement was guaranteed by using shaft encoder and frequency dividing circuit. Based on the platform of Visual C 6.0, the special image processing kit was developed to differentiate solid and liquid particles in the flow images. Investigation of the two-phase velocity fields prove that the crystal particles changes the relative liquid velocity distribution, and the outlet liquid velocity decreases compared with that under single phase condition. It is also concluded that the crystal particles have the tendency of moving towards the pressure side in the middle of the channel. The characteristics of salt-out flow in the pump were obtained, and some guiding advices were presented to prevent salt-out in pump impeller.
Number of references:8
Ei main heading:Pumps
Ei controlled terms:Centrifugal pumps - Digital image storage -Flow visualization - Fluid dynamics - Frequency dividingcircuits - Hydraulic machinery - Image processing - Imaging systems - Multiphase flow - Networks (circuits) - Pumping plants - Rotary pumps - Two phase flow
Uncontrolled terms:PIV - Liquid velocities - Crystal particles - Out flows - Pump impellers - Pressure sides - Visual C 6.0 - Phase conditions - Shaft encoders - Particle image velocimetry - Velocity fields - Flow images - Liquid particles - Synchronization problems - Measurement equipments - PIV measurements
Ei classification codes:402.1 Industrial and Agricultural Buildings - 446 Waterworks - 618.2 Pumps - 631.1 Fluid Flow, General - 632.2 Hydraulic Equipment and Machinery - 703.1 Electric Networks - 713.5 Other Electronic Circuits - 722.1 Data Storage, Equipment and Techniques - 722.4 Digital Computers and Systems - 723.2 Data Processing and Image Processing - 741 Light, Optics and Optical Devices - 741.3 Optical Devices and Systems - 746 Imaging Techniques - 931.1 Mechanics
Database:Compendex
2.Accession number:085011777176
Title:Study on the compressibility of maize straw rubbed
Authors:Fan, Lin; Wang, Chunguang; Wang, Hongbo; Zhao, Guizhi; Suo, Haixia
Author affiliation:Inner Mongolia Agricultural University, Huhhot 010018, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 11
Issue date:November 2008
Publication year:2008
Pages:p 76-80
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract:The compressibility of maize straw has great effect on the compressing processing, properties of products compressed, optimizing processing technology and designing compressing equipments of maize straw. The compressibility of maize straw rubbed was experimentally studied under certain initial density, different forms and different moisture contents with different compressing velocities. The relation curves of bulk modulus against compressing displacement and compressing density were analyzed by means of regressive analysis. Finally, the regressive mathematical model of compressibility was obtained. The results show that moisture content, initial densities and compressing velocities have obvious effects on compressibility of maize straw rubbed. Especially, when compressing density is larger than 230 kg/m3, the compressibility of maize straw rubbed reduces significantly with increasing of compressing density.
Number of references:10
Ei main heading:Compressibility
Ei controlled terms:Biomass - Moisture determination - Moisture - Renewable energy resources
Uncontrolled terms:Biomass energy - Influencing factors - Maize straw - Moisture contents - Initial densities - Regressive analysis - Bulk modulus - Processing technologies
Ei classification codes:443.1 Atmospheric Properties - 525.1 Energy Resources and Renewable Energy Issues - 801.4 Physical Chemistry - 805.1.1 Biochemical Engineering - 821.5 Agricultural Wastes - 944.2 Moisture Measurements - 951 Materials Science
Database:Compendex
3.Accession number:085011777177
Title:Simulation of tomato fruit individual growth rule based on revised logistic model
Authors:Yang, Lili; Wang, Yiming; Kang, Mengzhen; Dong, Qiaoxue
Author affiliation:China Agricultural University, Beijing 100083, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 11
Issue date:November 2008
Publication year:2008
Pages:p 81-84
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract:The tomato planting experiments in different planting densities and seasons were carried out to obtain the fruit growth data. Subsequently, the dynamic model of tomato fruit individual growth was established based on revised logistic model and the environment data (temperature, humidity, light). The experimental data were fit well with model output using Matlab software. The results indicate that tomato fruits grown in different phytomer positions and the same planting density have the same sink size. The linear relationship can be found between the diameters of different fruits with the same truss. Moreover, there is a delay of growth between different truss fruits.
Number of references:6
Ei main heading:Fruits
Ei controlled terms:Agricultural products - Agriculture - Forestry - Fruit juices - Growth (materials) - MATLAB - Trusses
Uncontrolled terms:Fruit growth rule - Revised logistic model - Tomato - Logistic models - Tomato fruits - Fruit growths - Planting densities - Model outputs - Experimental datums - Linear relationships - Environment datum - Phytomer - MATLAB softwares - Planting experiments - Growth rules
Ei classification codes:408.2 Structural Members and Shapes - 712.1 Semiconducting Materials - 723.1.1 Computer Programming Languages - 723.5 Computer Applications - 802.3 Chemical Operations - 821 Agricultural Equipment and Methods; Vegetation and Pest Control - 821.0 Woodlands and Forestry - 821.4 Agricultural Products - 822.3 Food Products - 921 Mathematics - 933.1.2 Crystal Growth - 951 Materials Science
Database:Compendex
4.Accession number:085011777178
Title:Detection algorithm of crop rows based on machine vision and randomized method
Authors:Jiang, Guoquan; Ke, Xing; Du, Shangfeng; Chen, Jiao
Author affiliation:China Agricultural University, Beijing 100083, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 11
Issue date:November 2008
Publication year:2008
Pages:p 85-88 93
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract:One way of navigating autonomous vehicles to perform field operations is using a vision of crop rows detection system. A new algorithm for rows recognition was presented based on machine vision and randomized method. During image pre-processing, a vertical projection method was employed to estimate the position of crop rows. Moreover, the randomized method was used for crop rows detecting. A candidate line was determined by two different localization points, which were selected from data space randomly. The threshold rule was adopted to further determine whether the candidate line is the desired one. The test results prove that the rows detection method is suitable for different crops. The average time required for a 640脳480 pixels color image is 220 ms and the recognition rate reaches 98%.
Number of references:12
Ei main heading:Crops
Ei controlled terms:Computer vision - Hough transforms - Signal detection
Uncontrolled terms:Crop rows detection - Machine vision - Randomized method - Crop rows - On machines - Pre-processing - Field operations - Vertical projections - Color images - New algorithms - Autonomous Vehicles - Detection methods - Test results - Threshold rules - Data spaces - Recognition rates - Detection systems - One ways - Detection algorithms
Ei classification codes:716.1 Information Theory and Signal Processing - 723.5 Computer Applications - 731.6 Robot Applications - 741.2 Vision - 821.4 Agricultural Products - 921.3 Mathematical Transformations
Database:Compendex
5.Accession number:085011777179
Title:Motion planning of a tomato harvesting manipulator for obstacle avoidance
Authors:Liang, Xifeng; Wang, Yongwei; Miao, Xiangwen
Author affiliation:Zhejiang University, Hangzhou 310029, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 11
Issue date:November 2008
Publication year:2008
Pages:p 89-93
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract:Free-obstacle motion planning of a tomato harvesting manipulator was studied based on a pseudo-distance approach. An optimization technique and alternative approach using a forward kinematics was applied to solve the path planning, which was modeled with consideration of manipulability measure maximization and obstacle avoidance for links of the manipulator. The simulation results show that the tomato harvesting manipulator can avoid obstacles successfully and reach the objective position along a specified geometric trajectory with optimal manipulability. The joints displacement varies smoothly within theirs limits. The position absolute error and moving rate of the end-effector are 0.87 mm and 0.18 m/s respectively. the harvesting manipulators can fulfill the accuracy of tomato picking with well working efficiency.
Number of references:12
Ei main heading:Motion planning
Ei controlled terms:Collision avoidance - Fruits - Harvesting - Manipulators - Optimization
Uncontrolled terms:Obstacle avoidance - Tomato - Obstacle avoidances - Manipulability - Working efficiencies - Simulation results - Path planning - Absolute errors - Forward kinematics - Geometric trajectories - Alternative approaches - Optimization techniques - Obstacle motions
Ei classification codes:431.5 Air Navigation and Traffic Control - 691.1 Materials Handling Equipment - 723.4 Artificial Intelligence - 731.5 Robotics - 821.3 Agricultural Methods - 821.4 Agricultural Products - 914.1 Accidents and Accident Prevention - 921.5 Optimization Techniques
Database:Compendex
6.Accession number:085011777180
Title:Obstacle avoidance path planning of eggplant harvesting robot manipulator
Authors:Yao, Lijian; Ding, Weimin; Chen, Yulun; Zhao, Sanqin
Author affiliation:Nanjing Agricultural University, Nanjing 210031, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 11
Issue date:November 2008
Publication year:2008
Pages:p 94-98
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract:A method was put forward to avoid obstacles for an eggplant harvesting robot manipulator in Cartesian space. The obstacles were supposed equivalently as cylindrical-rings, and then a three-dimensional planning path problem was simplified to a two-dimensional one, which improved the real-time control performance greatly. Transforming the obstacles from work-space to configuration-space could control the robot joints directly, which could avoid complex coordinate translation using Jacobian inverse matrix. Moreover, processing properly image matrix mapped from C-space could avoid the path planning failure under A-star algorithm. The experimental results show that this algorithm with less computational amount and excellent real-time performance is suitable for harvesting natural growing eggplant automatically.
Number of references:17
Ei main heading:Robotics
Ei controlled terms:Flexible manipulators - Harvesting - Industrial robots - Inverse problems - Manipulators - Modular robots - Real time control - Real time systems - Robot applications - Robots - Three dimensional
Uncontrolled terms:Eggplant harvesting robot - Obstacle avoidance - Path planning - Obstacle avoidances - Robot manipulators - Image matrixes - Inverse matrixes - Jacobians - Real-time performances - C spaces - Time controls - Path problems - Cartesian spaces
Ei classification codes:691.1 Materials Handling Equipment - 722.4 Digital Computers and Systems - 723.5 Computer Applications - 731 Automatic Control Principles and Applications - 731.5 Robotics - 731.6 Robot Applications - 732 Control Devices - 821.3 Agricultural Methods - 902.1 Engineering Graphics - 912.1 Industrial Engineering - 921 Mathematics
Database:Compendex
7.Accession number:085011777181
Title:Design of a synchronization control system for fruit machine vision grader
Authors:Wei, Xinhua; Hu, Xuetong; Zhou, Xingpeng; Zhang, Jun
Author affiliation:Southeast University, Nanjing 210096, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 11
Issue date:November 2008
Publication year:2008
Pages:p 99-103
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract:Based on a mixed network of RS485-bus and CAN-bus, a distributed synchronization control system for fruit machine vision grader was designed by adopting a modular structure. The control system could realize synchronization with a timing signal generated by a rotary encoder, could trigger cameras timely to capture dynamic image sequence of fruits flow on conveyor of the grader when they were in preconcerted positions of the grader, could register dynamically the fruits grade information with their real-time positions after their grades had been determined by image processing unit of the grader, and could instruct corresponding discharging actuators to implement discharging process of the fruits when they had been conveyed to the discharging ports of their grades. The experimental results show that different parts of the grader are coordinated with each other under control of the synchronization control system and all fruits have been discharged at the prospective discharging ports.
Number of references:9
Ei main heading:Control systems
Ei controlled terms:Buses - Computer vision - Control system analysis - Control theory - Fruit juices - Fruits - Image processing - Machine design - Modular construction - Ports and harbors - Synchronization
Uncontrolled terms:Field bus - Machine vision - Synchronization control - Machine visions - Synchronization controls - Rotary encoders - Distributed synchronizations - Timing signals - Can buses - Discharging processes - Capture dynamics - Modular structures
Ei classification codes:405.2 Construction Methods - 407.1 Maritime Structures - 601 Mechanical Design - 663.1 Heavy Duty Motor Vehicles - 723.2 Data Processing and Image Processing - 723.5 Computer Applications - 731.1 Control Systems - 731.6 Robot Applications - 741 Light, Optics and Optical Devices - 741.2 Vision - 821.4 Agricultural Products - 822.3 Food Products - 961 Systems Science
Database:Compendex
8.Accession number:085011777182
Title:Low energy construction method of wireless sensor network for greenhouse
Authors:Shen, Min; Zhang, Rongbiao; Feng, Youbing
Author affiliation:Jiangsu University, Zhenjiang 212013, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 11
Issue date:November 2008
Publication year:2008
Pages:p 104-108
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract:Combined with the characteristics of greenhouse measurement and control system, the spatial structure and time sequence of wireless sensor network were constructed to reduce and balance node energy consumption to prolong network lifetime. As to the network spatial structure, each mobile sink node located at the upper side of greenhouse, could provide abundant energy. Taking the mobile sink nodes as hinges, the limited energy sub-nodes made up of the stelliform wireless network. As to the network time sequence, the sub-nodes were active only in communication duration and sleeping in other phases. The maximal communication radius of sub-nodes and the minimal communication radius of sink nodes were analyzed to solve the problem of network connectivity.
Number of references:12
Ei main heading:Wireless sensor networks
Ei controlled terms:Arsenic - Control systems - Greenhouses - Hybrid sensors - Sensor networks - Sensors
Uncontrolled terms:Network construction - Mobile sink nodes - Spatial structures - Time sequences - Network connectivities - Network lifetimes - Measurement and controls - Sink nodes - Minimal communications - Node energies - Construction methods - Low energies
Ei classification codes:402.1 Industrial and Agricultural Buildings - 716.3 Radio Systems and Equipment - 722.3 Data Communication, Equipment and Techniques - 722.4 Digital Computers and Systems - 723.2 Data Processing and Image Processing - 731.1 Control Systems - 732 Control Devices - 732.2 Control Instrumentation - 801 Chemistry - 804 Chemical Products Generally - 821.6 Farm Buildings and Other Structures
Database:Compendex
9.Accession number:085011777183
Title:Analysis on key technologies of product life cycle energy-saving design
Authors:Chen, Peng; Liu, Zhifeng; Liu, Guangfu
Author affiliation:Hefei University of Technology, Hefei 230009, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 11
Issue date:November 2008
Publication year:2008
Pages:p 113-116 121
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract:The energy consumed by mechanical products is huge, and its using ratio is low. In view of these problems, several key technologies of product energy-saving design were discussed. Based on the life cycle theory, the information model of product energy-consuming was established. Subsequently, the processing model of energy gene was analyzed through the n-m mapping. The processing model was set up by using the method of IFED3 and the energy gene distilling strategy was put forward. Finally, the optimization of energy-saving design method and the possible feedback mechanisms were discussed respectively.
Number of references:13
Ei main heading:Life cycle
Ei controlled terms:Design - Energy conservation - Machine design - Machinery
Uncontrolled terms:Energy gene - Energy-saving design - Key technologies - Feedback mechanisms - Design methods - Information models - Mechanical products - Product life cycles
Ei classification codes:408 Structural Design - 525.2 Energy Conservation - 601 Mechanical Design - 902.1 Engineering Graphics - 913.1 Production Engineering
Database:Compendex
10.Accession number:085011777184
Title:Hybrid PSO for solving modular product configuration optimization problem
Authors:Liu, Qiong; Zhao, Han; Zheng, Caixia; Zhang, Mingwei
Author affiliation:Hefei University of Technology, Hefei 230009, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 11
Issue date:November 2008
Publication year:2008
Pages:p 117-121
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract:The relationship between customer demand and the modular instances of configurable product was established to solve the product configuration optimization problem. Constrained terms were processed by the dynamic penalty function and the mathematical model was built. The basic PSO algorithm was improved by using crossover and mutation strategy of genetic algorithm and Metropolis rule of simulated annealing algorithm. The hybrid PSO algorithm was used to solve modular product configuration optimization, and the binary encoding scheme was adopted to express the configurable product cases. Finally, a simulation comparison of product configuration optimization was carried out by the hybrid PSO and genetic algorithm respectively. The results show that the hybrid PSO algorithm is simple and effective.
Number of references:6
Ei main heading:Particle swarm optimization (PSO)
Ei controlled terms:Genetic algorithms - Optimization - Simulated annealing
Uncontrolled terms:Customer demand - Hybrid PSO - Modular - Product configuration optimization - Product configurations - Pso algorithms - Modular product configurations - Configurable - Customer demands - Penalty functions - Simulated annealing algorithms - Metropolis rules - And genetic algorithms - Crossover and mutations - Simulation comparisons - Binary encoding - Constrained terms
Ei classification codes:537.1 Heat Treatment Processes - 723 Computer Software, Data Handling and Applications - 921 Mathematics - 921.5 Optimization Techniques
Database:Compendex
11.Accession number:085011777185
Title:Control technology of knowledge-flow in collaborative design
Authors:Wang, Shengfa; Gu, Xinjian; Zhang, Taihua; Guo, Jianfeng; Pan, Min
Author affiliation:Wuyi University, Jiangmen 529020, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 11
Issue date:November 2008
Publication year:2008
Pages:p 122-126
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract:The relationship between knowledge-flow and task of collaborative design was analyzed.In order to control knowledge-flow in collaborative design, a resource space model was used to depict knowledge and a method to depict knowledge through matrix was presented in the resource space model, which could control and manage the contents of knowledge-flow conveniently. Collaborative design was driven by workflow. Through integration between knowledge-flow and workflow, an integrated control panel was presented and two integrated control algorithms for knowledge-flow and workflow were given. Finally, a prototype system was developed to assist to control knowledge-flow in collaborative design and the control of knowledge-flow in collaborative was realized.
Number of references:7
Ei main heading:Design
Ei controlled terms:Integrated control - Management
Uncontrolled terms:Collaborative design - Knowledge-flow - Resource space model - Workflow - Collaborative designs - Resource spaces - Prototype systems - Control technologies
Ei classification codes:408 Structural Design - 731.1 Control Systems - 902.1 Engineering Graphics - 912.2 Management
Database:Compendex
12.Accession number:085011777186
Title:Job-shop scheduling algorithm considering machine set-up and material transit time
Authors:Ge, Maogen; Liu, Mingzhou; Zhang, Mingwei; Jiang, Zengqiang; Zhang, Mingxin
Author affiliation:Hefei University of Technology, Hefei 230009, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 11
Issue date:November 2008
Publication year:2008
Pages:p 127-131
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing,100083, China
Abstract:The Job-Shop problems considering material transit time and machine set-up time were studied. During the optimization and calculation, the material transit time and the influences on the Job-Shop scheduling were taken into account. Subsequently, the solution method was provided and the Job-Shop scheduling problem was solved using hybrid PSO algorithm combining GA and SA. Finally, the analysis and calculation of interaction between material transit time, machining time and machine set-up time was carried out by the simulation based on real conditions. The results show that the proposed method considering the machine set-up time and material transit time is more feasible and realistic than the scheduling which appends the material machining time directly.
Number of references:8
Ei main heading:Scheduling
Ei controlled terms:Machining - Optimization - Particle swarm optimization (PSO) - Reinforcement learning - Theorem proving
Uncontrolled terms:Hybrid particle swarm optimization algorithm - Job-Shop scheduling - Machine set-up time - Transit times - Machine sets - Up times - Shop scheduling - Machining times -Job-shop scheduling problems - Real conditions - Solution methods - Simulation based - Pso algorithms
Ei classification codes:604.2 Machining Operations - 721.1 Computer Theory, Includes Formal Logic, Automata Theory, Switching Theory, Programming Theory - 723.4 Artificial Intelligence -912.2 Management - 921 Mathematics - 921.5 Optimization Techniques
Database:Compendex
13.Accession number:085011777187
Title:Pose normalization of 3-D mesh model based on rotation transformation
Authors:Yuan, Hao; Lu, Zhangping; Bi, Wei; Nie, Qian
Author affiliation:Jiangsu University, Zhenjiang 212013, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 11
Issue date:November 2008
Publication year:2008
Pages:p 132-137
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract:A novel method for pose normalization of 3-D mesh models was put forward based on rotation transformation. Via the theory of analytic geometry, this paper analyzed the rotation transformation of a plane, a projection transformation revolving about a basis vector, and developed the computational formula of rotation angle. We also achieved the computable rotation matrix for mesh models through further research integrating with computational graphics and probability theory. As a result, a mesh model with arbitrary position was transformed into normalized pose through rotation transformation. The experimental results show that this algorithm can calculate out the angle for rotation transformation and construct the rotation matrix to accomplish the pose estimation automatically.
Number of references:17
Ei main heading:Rotation
Ei controlled terms:Boolean functions - Mathematical transformations - Three dimensional
Uncontrolled terms:Mesh model - Pose normalization - Projection transformation - Rotation transformation - Rotation transformations - Mesh models - Pose normalizations - Projection transformations - Rotation matrixes - Rotation angles - Computational formulas - Pose estimations - Basis vectors - Arbitrary positions - A planes - Probability theories - Analytic geometries - Novel methods
Ei classification codes:601.1 Mechanical Devices - 721.1 Computer Theory, Includes Formal Logic, Automata Theory, Switching Theory, Programming Theory - 723.5 Computer Applications - 902.1 Engineering Graphics - 921.1 Algebra - 921.3 Mathematical Transformations - 931.1 Mechanics
Database:Compendex
14.Accession number:085011777188
Title:Optimization design of discrete variables for two-stage epicyclic gearing
Authors:Chen, Lian
Author affiliation:Huaihai Institute of Technology, Lianyungang 222005, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 11
Issue date:November 2008
Publication year:2008
Pages:p 138-141 163
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract:In the planetary gear transmission system, each gear-teeth cannot be arbitrary positive integers, which are subjected to drive ratio, matching and coaxial requirements. The module of gear only can take certain discrete values for the limit of national standards. It is difficult to obtain the valid solution with the classical restrictions random (CRR) optimization method based on mathematics plan theory. A discrete variables intelligent optimization method with simulation annealing algorithm was presented. The mathematical model of optimization design for two-stage 2Z-X epicyclic gearing was established and an example was presented subsequently. Compared with the CRR method, this method can obtain the global optimal solution more easily and quickly and can be used in engineering design without any post-treatment.
Number of references:6
Ei main heading:Optimization
Ei controlled terms:Cooling systems - Design - Electric power transmission - Gear teeth - Gears - Machinery - Power transmission - Simulated annealing - Time varying systems - Transmissions - Trees (mathematics) - Wheels
Uncontrolled terms:Discrete variables - Epicyclic gearing - Optimum design - Simulation annealing algorithm - Simulation annealing algorithms - Optimization designs - Drive ratios - Intelligent optimization methods - Optimization methods - Positive integers - Engineering designs - Global optimal solutions - National standards - Discrete values - Planetary gears
Ei classification codes:408 Structural Design - 537.1 Heat Treatment Processes - 601 Mechanical Design - 601.2 Machine Components - 602.2 Mechanical Transmissions - 616.1 Heat Exchange Equipment and Components - 641.2 Heat Transfer - 706.1.1 Electric Power Transmission - 731.1 Control Systems - 902.1 Engineering Graphics - 921 Mathematics - 921.4 Combinatorial Mathematics, Includes Graph Theory, Set Theory - 921.5 Optimization Techniques - 961 Systems Science
Database:Compendex
15.Accession number:085011777189
Title:Visualization analysis of the flow field in a moving spool valve
Authors:Zhao, Lei; Chen, Qing; Quan, Long
Author affiliation:Taiyuan University of Technology, Taiyuan 030024, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 11
Issue date:November 2008
Publication year:2008
Pages:p 142-145 155
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract:The flow field inside the spool valve during spool moving was simulated and analyzed using the CFD software Fluent. The simulation results show that the transient flow force is large when the valve is in small throttle with large flow and high moving speed, which must be considered during the valve design. By the analysis of the hydraulic force act on the valve-pole, there is an additional radial force that causes valve element lockup existed. This force is difficult to be balanced with only structure method. By computing the discharge coefficient valve in static and dynamic condition, the results show that the discharge coefficient changes greatly with the spool stroke and moving state.
Number of references:8
Ei main heading:Flow simulation
Ei controlled terms:Discharge (fluid mechanics) - Flow fields - Flow of fluids - Orifices - Reels - Visualization
Uncontrolled terms:Discharge coefficient - Flow force - Radial force - Spool valve - Visualization analysis
Ei classification codes:407 Maritime and Port Structures; Rivers and Other Waterways - 444.1 Surface Water - 619.1 Pipe, Piping and Pipelines - 631.1 Fluid Flow, General - 631.1.1 Liquid Dynamics - 691.2 Materials Handling Methods - 722.1 Data Storage, Equipment and Techniques - 723.5 Computer Applications - 742.2 Photographic Equipment - 902.1 Engineering Graphics - 931.1 Mechanics
Database:Compendex
16.Accession number:085011777190
Title:Control strategy of grid-connected inverter used in direct drives for wind turbine
Authors:Xie, Zhen; Zhang, Xing; Yang, Shuying; Guo, Dong
Author affiliation:Hefei University of Technology, Hefei 230009, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 11
Issue date:November 2008
Publication year:2008
Pages:p 146-150
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract:In high-power direct drives for wind turbine, the control of grid-connected inverter is vital to power transporting and energy converting, and the output current with harmonic distortion is high. A filter, typically a series inductance, is adopted to reduce the switching harmonics entering the distribution network. An alternative filter is a LCL-filter, which can reduce the level of harmonic distortion. The control strategy of grid-connected inverter was used in this system based on a loop of bridge current regulator with grid voltage feed forward. A new decoupled double synchronous reference frame phase-locked loop was adopted in this system under unbalanced and distorted grid conditions. A 15 kW direct drive for wind turbine system was constructed in the laboratory. The results prove that the grid-connected inverter can run stability and has good performances.
Number of references:9
Ei main heading:Wind power
Ei controlled terms:Distributed parameter networks - Distributed power generation - Distribution of goods - Drives - Electric generators - Electric transformers - Engines - Harmonic analysis - Harmonic distortion - Phase locked loops - Turbines - Wave filters - Wind turbines
Uncontrolled terms:Control strategy - DDSRF-PLL - Grid-connected inverter - LCL-filter - Wind turbine generator
Ei classification codes:602.1 Mechanical Drives - 612 Engines - 612.3 Gas Turbines and Engines - 615 Thermoelectric, Magnetohydrodynamic and Other Power Generators - 615.8 Wind Power (Before , use code ) - 617.1 Hydraulic Turbines - 617.2 Steam Turbines - 617.3 Steam Engines - 632.2 Hydraulic Equipment and Machinery - 632.4 Pneumatic Equipment and Machinery - 654.2 Rocket Engines - 691 Bulk Handling and Unit Loads - 702 Electric Batteries and Fuel Cells - 703.1 Electric Networks - 703.2 Electric Filters - 704 Electric Components and Equipment - 705 Electric Generators and Motors - 705.2 Electric Generators - 706.1.2 Electric Power Distribution - 706.2 Electric Power Lines and Equipment - 713.5 Other Electronic Circuits - 714 Electronic Components and Tubes - 715 Electronic Equipment, General Purpose and Industrial
Database:Compendex
17.Accession number:085011777191
Title:Agricultural equipment information network based on resource management and Silverlight
Authors:Tian, Zhaofeng; Yan, Chuliang
Author affiliation:Chinese Academy of Agricultural Mechanization Sciences, Beijing 100083, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 11
Issue date:November 2008
Publication year:2008
Pages:p 151-155
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract:There are much structural and non-structural data in the agricultural equipment information network database, and the data management and mining are difficult. A new method of resource management was adopted to develop agricultural equipment information network. In the resource management system, most dynamic data were translated into html pages and stored in document server, which can reduce the load of the servers greatly. Rich clients having access to multimedia resources technology were realized by Silverlight technology and the executing efficiency of the system was improved. The application of resource management method makes the data management easier and enhances the resource usability of agricultural equipment information network.
Number of references:9
Ei main heading:Network management
Ei controlled terms:Equipment - Information management - Information services -Knowledge management - Management information systems - Management - Markup languages - Multimedia systems - Natural resources management - Resource allocation - Servers
Uncontrolled terms:Agricultural equipment information network - Resource management - Rich client - Three-tier framework - Agricultural equipments - Resource managements - Data managements - Multimedia resources - HTML pages - Dynamic datums - Resource Management systems - Structural datums
Ei classification codes:444 Water Resources - 454 Environmental Engineering - 717.1 Optical Communication Systems - 722 Computer Systems and Equipment - 722.3 Data Communication, Equipment and Techniques - 723 Computer Software, Data Handling and Applications - 723.2 Data Processing and Image Processing - 723.5 Computer Applications - 901 Engineering Profession - 903.2 Information Dissemination - 903.3 Information Retrieval and Use - 903.4 Information Services - 912.2 Management - 912.3 Operations Research
Database:Compendex
18.Accession number:085011777192
Title:Bifurcation control of guideway stick-slip motion with washout filter
Authors:Ma, Jun; Yang, Gongliu
Author affiliation:Tianjin University, Tianjin 300072, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 11
Issue date:November 2008
Publication year:2008
Pages:p 156-159
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract:Control of Hopf bifurcation in guideway stick-slip motion by using Washout filter was studied. The point at which the Hopf bifurcation to be introduced was determined. Then the linear and nonlinear control gains were determined according to Hopf bifurcation condition in order to transfer the sub-critical Hopf bifurcation to be super-critical one. The result shows that the amplitude of slide-slip of the controlled guideway system is reduced to 14% of that of the uncontrolled system. Theoretical analysis and computer simulation show that Washout filter method can work well in Hopf control of guideway stick-slip motion.
Number of references:10
Ei main heading:Hopf bifurcation
Ei controlled terms:Bifurcation (mathematics) - Electric network analysis - Guideways - Nonlinear control systems - Slip forming - Wave filters
Uncontrolled terms:Bifurcation control - Stick-slip - Washout filter - Washout Filters - Slip motions - Bifurcation controls - Uncontrolled systems - Bifurcation conditions - Theoretical analyses - Nonlinear controls
Ei classification codes:405.2 Construction Methods - 412 Concrete - 433 Railroad Transportation - 681.1 Railway Plant and Structures, General - 703.1.1 Electric Network Analysis - 703.2 Electric Filters - 731.1 Control Systems - 921 Mathematics - 931 Classical Physics; Quantum Theory; Relativity
Database:Compendex
19.Accession number:085011777193
Title:Numerical simulation of micro-extrusion
Authors:Li, Zhi; Wang, Yun; Sun, Riwen; Dong, Peilong; Zhu, Yongshu
Author affiliation:Xuzhou Institute of Technology, Xuzhou 221082, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 11
Issue date:November 2008
Publication year:2008
Pages:p 160-163
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract:With the development of MEMS, the demands of micro-extrusion are increasing gradually. However, some problems such as the unavoidable scale effect occurring in miniaturization challenge the plastic process, mechanics and equipment. Warm micro-extrusion process is presented and the development of micro-extrusion is discussed. ABAQUS/Explicit FEM software is used to simulate the micro-extrusion to obtain the flow behaviour of the material in receptacle. The influences of equivalent stress, strain and extruding force on formability are investigated. It is found that the deforming non-uniformity in work can be improved through changing extruding velocity, the influence of extruding velocity on stress distribution is not obvious, the control of extruding velocity can reduce the extruding force effectively. Finally, the standard of convexity of extruding parts is initialized to evaluate the formability of micro-extrusion.
Number of references:8
Ei main heading:Forming
Ei controlled terms:Computer simulation - Extrusion - High energy forming - Stress concentration - Stresses - Velocity
Uncontrolled terms:Convexity of extruding - Extruding velocity - Micro-extrusion -Numerical simulation - Numerical simulations - Extruding forces - Equivalent stresses - Flow behaviours - Plastic processes - Stress distributions - FEM softwares - Extrusion processes - Scale effects
Ei classification codes:408.1 Structural Design, General - 421 Strength of Building Materials; Mechanical Properties - 422 Strength of Building Materials; Test Equipment and Methods - 535.2 Metal Forming - 535.2.2 Metal Forming Practice - 723.5 Computer Applications - 816.1 Processing of Plastics and Other Polymers - 931.1 Mechanics
Database:Compendex
20.Accession number:085011777194
Title:Removal mechanism of hydrodynamic suspension ultra-smooth machining for hard-brittle materials
Authors:Cao, Zhiqiang; Zhan, Jianming; Zhang, Fu
Author affiliation:Beijing Sevenstar Electronics Co. Ltd., Beijing 100016, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 11
Issue date:November 2008
Publication year:2008
Pages:p 164-168
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract:The dynamic indentation fracture mechanics and particles impacting erosion theory were applied to the research of hydrodynamic suspension ultra-smooth machining. The theoretic model of nanoscale abrasive particles impacting workpiece surface micro asperities was established. Subsequently, the experiments of machining for aluminum alloy and K9 glass were carried out respectively. The results show that the hydrodynamic suspension machining is the process of nanoscale impacting the surface asperities to realize the micro removal, and the nanaoscale ultra-smooth surface without damage can be obtained during hydrodynamic suspension machining for K9 glass.
Number of references:12
Ei main heading:Fluid dynamics
Ei controlled terms:Alumina - Brittle fracture - Brittleness - Fracture mechanics - Glass - Hydrodynamics - Machining - Nanostructured materials - Nanotechnology - Strength of materials - Surfaces - Suspensions (components)
Uncontrolled terms:Hard-brittle materials - Hydrodynamic suspension machining mechanism - Micro removal - Ultra-smooth surface - Hydrodynamic suspensions - Brittle materials - Nanoscale - Smooth surfaces - K9 glasses - Workpiece surfaces - Erosion theories - Abrasive particles - Indentation fracture mechanics - Surface asperities - Removal mechanisms
Ei classification codes:421 Strength of Building Materials; Mechanical Properties - 422 Strength of Building Materials; Test Equipment and Methods - 601.2 Machine Components - 604.2 Machining Operations - 631.1 Fluid Flow, General - 631.1.1 Liquid Dynamics - 631.2 Hydrodynamics - 714.2 Semiconductor Devices and Integrated Circuits - 761 Nanotechnology - 801.4 Physical Chemistry - 804.2 Inorganic Compounds - 812.1 Ceramics - 812.3 Glass - 931 Classical Physics; Quantum Theory; Relativity - 931.1 Mechanics - 933.1 Crystalline Solids - 951 Materials Science
Database:Compendex
21.Accession number:085011777195
Title:Effects of chamfered parameters on cutting processes in hard turning of hardened steel using PCBN cutting tools
Authors:Chen, Tao; Liu, Xianli; Luo, Guotao
Author affiliation:Harbin University of Science and Technology, Harbin 150080, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 11
Issue date:November 2008
Publication year:2008
Pages:p 169-171 175
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract:When polycrystalline cubic boron nitride (PCBN) cutting tools machine hardened steel GCr15, the effects of the chamfered edge parameters (including chamfer width and chamfer angle) on the cutting force, cutting temperature and saw-tooth chips morphology were investigated respectively. The results indicate that the main cutting force, radial force and cutting temperature increase gradually with the increment of chamfer width, but the chamfer width has less effect on the serrated saw-tooth chips. It is shown that the cutting force, radial force and cutting temperature increase with the enlargement of chamfer angle, and the radial force increases more significantly. As the chamfer angle is 20擄 , the chips has the lowest serration.
Number of references:10
Ei main heading:Cutting tools
Ei controlled terms:Boron nitride - Boron - Cubic boron nitride - Dentistry - Hardening - Machine tools - Metal working tools - Nitrides - Sawing - Steel - Turning
Uncontrolled terms:Chamfer - Hard turning - Polycrystalline cubic boron nitride - Cutting temperatures - Radial forces - Cutting forces - Hard turnings - Polycrystalline cubic boron nitrides - Hardened steels - Cutting processes
Ei classification codes:461.1 Biomedical Engineering - 461.6 Medicine and Pharmacology - 462.3 Dental Equipment and Supplies - 537.1 Heat Treatment Processes - 545.3 Steel - 549.3 Others, including Bismuth, Boron, Cadmium, Cobalt, Mercury, Niobium, Selenium, Silicon, Tellurium and Zirconium - 603.1 Machine Tools, General - 603.2 Machine Tool Accessories - 604.1 Metal Cutting - 604.2 Machining Operations - 605 Small Tools and Hardware - 804.2 Inorganic Compounds - 811.2 Wood and Wood Products - 812.1 Ceramics
Database:Compendex
22.Accession number:085011777196
Title:Body surface morphology and wettability of the oriental mole cricket (Gryllotalpa orientalis Burmeister)
Authors:Gao, Hang; Tong, Jin
Author affiliation:Jilin University, Changchun 130025, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 11
Issue date:November 2008
Publication year:2008
Pages:p 172-175
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract:The surface morphologies of the pronotum, abdomen, proala, membranous wing and legs of the oriental mole cricket (Gryllotalpa orientalis Burmeister) were examined by scanning electron microscopy (SEM). The coverage density and size of seta of the oriental mole cricket were measured. The contact angles of water on the body surfaces of the oriental mole cricket were determined respectively with an interface tension/wetting-angle measuring instrument (OCA20 Model). Subsequently, the relationship of wettability of the body surfaces of the oriental mole cricket with geometrical structure of its body surface was studied. The results show that the coverage densities of the seta on pronotum, proala, abdomen, legs and membranous wing of the oriental mole cricket are 40.32%, 31.82%, 23.89%, 19.11% and 14.17% respectively. The average apparent contact angles of water on the surface of the oriental mole cricket are from 110.8擄 to 141.5擄. The strong hydrophobic ability of the oriental mole cricket is appeared. The comprehensive action of the geometrically structural surface formed by seta and their hydrophobic function is the dominant mechanism of preventing adhesion of soil and water from their body surface.
Number of references:5
Ei main heading:Surface morphology
Ei controlled terms:Biomimetics - Contact angle - Hydrophobicity - Surface structure
Uncontrolled terms:Body surface morphology - Gryllotalpa orientalis Burmeister - Wettability - Mole crickets - Body surfaces - Geometrical structures - Dominant mechanisms - Structural surfaces - Angle measuring
Ei classification codes:461.8 Biotechnology - 461.9 Biology - 631.1.1 Liquid Dynamics - 801.2 Biochemistry - 931.2 Physical Properties of Gases, Liquids and Solids - 951 Materials Science
Database:Compendex
23.Accession number:085011777197
Title:Numerical simulation on bionic blade of paddy impeller
Authors:Zhang, Yongzhi; Zuo, Chuncheng; Sun, Shaoming; Li, Jiwen; Chang, Qing; Wu, Yuehong
Author affiliation:Jilin University, Changchun 130022, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 11
Issue date:November 2008
Publication year:2008
Pages:p 176-179 202
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract:The particular geometric shape of the buffalo hoof is suitable for walking on the paddy-field and has low resistance during working. The bionic information of the buffalo hoof was extracted by reverse engineering technology, and then the bionic blade for paddy-field impeller was designed. To guide the design of paddy impeller, the mechanism of performance improvement of bionic blade was studied by numerical simulation. The simulation results show that the fluid medium impact and separation of blade surface fluid velocity mutation can be delayed by the bionic shape effectively. The bionic shape can reduce impact endurance test resistance of the separated flow, and improve the driving force of impeller. Moreover, the bionic blade may increase its driving torque.
Number of references:13
Ei main heading:Bionics
Ei controlled terms:Computer simulation - Impact resistance - Machine design - Reengineering - Reverse engineering
Uncontrolled terms:Bionic blade - Buffalo hoof - Numerical simulation - Paddy impeller - Numerical simulations - Simulation results - Fluid mediums - Blade surfaces - Performance improvements - Driving forces - Separated flows - Endurance tests - Driving torques - Fluid velocities - Low resistances - Geometric shapes
Ei classification codes:408.1 Structural Design, General - 421 Strength of Building Materials; Mechanical Properties - 461.1 Biomedical Engineering - 601 Mechanical Design - 723 Computer Software, Data Handling and Applications - 723.5 Computer Applications - 731.1 Control Systems - 912.2 Management - 913.3 Quality Assurance and Control
Database:Compendex
24.Accession number:085011777198
Title:Nonlinear characteristics of two-span rotor-bearing system with coupling faults of pedestal looseness and rub-impact
Authors:Luo, Yuegang; Du, Yuanhu; Ren, Zhaohui; Wen, Bangchun
Author affiliation:Dalian Nationalities University, Dalian 116600,China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 11
Issue date:November 2008
Publication year:2008
Pages:p 180-183 206
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract:A non-linear dynamic model of a two-span elastic rotor-bearing system with coupling faults of pedestal looseness and rub-impact supported on three plain journal bearings was established. The complex motion characteristics of the rotor-bearing system were studied numerically. The simulation results show that the unstable rotate speed of the rotor system with coupling faults is between the single fault of pedestal looseness and rub-impact. Within the sub-critical speed range, the chaotic region is increased firstly and than reduced gradually with the increase of the looseness mass. Within the super-critical speed range, the quasi-periodic motion disappears and the chaotic region is reduced gradually with the increase of the looseness mass, and the period-3 motion region appears obviously.
Number of references:7
Ei main heading:Bearings (structural)
Ei controlled terms:Bearings (machine parts) - Electric fault currents - Journal bearings - Pneumatic drives
Uncontrolled terms:Fault diagnosis - Looseness - Nonlinear characteristic - Rub-impact - Bearing systems - Pedestal loosenesses - Coupling faults - Nonlinear characteristics - Chaotic regions - Critical speeds - Simulation results - Motion regions - Periodic motions - Complex motions - Elastic rotors - Single faults - Rotor systems - Rotate speeds - Plain journal bearings - Linear dynamic models
Ei classification codes:401.1 Bridges - 408.2 Structural Members and Shapes - 601.2 Machine Components - 632.4 Pneumatic Equipment and Machinery - 701.1 Electricity: Basic Concepts and Phenomena - 706.2 Electric Power Lines and Equipment
Database:Compendex
25.Accession number:085011777199
Title:Filtering method based on wavelet 2D-hidden markov model
Authors:Ye, Dapeng; Ding, Qiquan; Wu, Zhaotong
Author affiliation:Fujian Agriculture and Forestry University, Fuzhou 350002, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 11
Issue date:November 2008
Publication year:2008
Pages:p 184-186 196
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract:The 2-D hidden Markov model (2D-HMM) has the ability of representing the signals, which are non-stationary and worse reappearance in the rotor run-up process. Analyzing the relationship of different level wavelet coefficients and the same levels, a new filtering method based on wavelet 2D-HMM was proposed and its detail steps were presented. Finally, this method was validated by the data collected from Bently-Nevada rotor experimental system (Model 24755). The results demonstrate that it is effective to remove the noise of non-stationary signals of rotor system.
Number of references:8
Ei main heading:Wavelet transforms
Ei controlled terms:Hidden Markov models - Machinery - Markov processes - Object recognition
Uncontrolled terms:2D-HMM - Filtering - Vibration signal - Filtering methods - Rotor systems - Wavelet coefficients - Stationary signals - Experimental systems
Ei classification codes:601 Mechanical Design - 716 Telecommunication; Radar, Radio and Television - 723.5 Computer Applications - 741.1 Light/Optics - 751.1 Acoustic Waves - 921.3 Mathematical Transformations - 922 Statistical Methods - 922.1 Probability Theory
Database:Compendex
26.Accession number:085011777200
Title:Design parameters analysis of similar coupled acoustic field inner automobile
Authors:Chen, Jian; Gao, Yu; Cheng, Hao; Bi, Chuanxing
Author affiliation:Anhui Key Laboratory of Vehicle NVH and Reliability, Hefei 230009, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 11
Issue date:November 2008
Publication year:2008
Pages:p 187-191
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract:A model of similar coupled acoustic field consisted of the engine room and the driver room was established. The effects of the energy self-lost factor and the firewall thickness of the engine room on the acoustic energy of each subsystem were studied with the statistic energy analysis method. Subsequently, the parametric sensitivity analysis illuminated the energy varying characteristics with respect to the energy self-lost factor and the firewall thickness of the engine room. The results provide a reference for the parameter optimization during automobile design.
Number of references:15
Ei main heading:Sensitivity analysis
Ei controlled terms:Acoustic field measurement - Acoustic fields - Acoustic waves - Acoustics - Automobile engines - Computer system firewalls - Electric network parameters - Energy management - Optimization - Structural optimization
Uncontrolled terms:Coupled acoustic field - Parametric optimization - Engine rooms - Parameter optimizations - Parametric sensitivities - Automobile designs - Energy analysis methods - Sub systems - Acoustic energies - Design Parameters
Ei classification codes:525 Energy Management and Conversion - 661.1 Automotive Engines - 703.1 Electric Networks - 723.2 Data Processing and Image Processing - 731.1 Control Systems - 751 Acoustics, Noise. Sound - 751.1 Acoustic Waves - 751.2 Acoustic Properties of Materials - 921 Mathematics - 921.5 Optimization Techniques - 941.2 Acoustic Variables Measurements
Database:Compendex
27.Accession number:085011777201
Title:Fault feature extraction of automobile main reducer based on complex Morlet wavelet transform
Authors:Zhang, Zhigang; Zhou, Xiaojun; Gong, Ran
Author affiliation:Zhejiang University, Hangzhou 310027, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 11
Issue date:November 2008
Publication year:2008
Pages:p 192-196
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract:Introducing the complex wavelet transform into the fault feature extraction of automobile main reducer, a fault feature extraction method for automobile main reducer based on complex Morlet wavelet transform was proposed. Aimed at the characteristics of main reducer vibrating signal, two groups of compounding information for the extraction of mechanical fault feature were constructed according to the magnitudes and phases of complex wavelet transform. The simulation results show that the phases of complex wavelet transform and compounding information are more sensitive to singular points of signal than magnitudes, which can extract singularity of signal efficiently and position the singular points of signal accurately. Subsequently, the fault signal of automobile main reducer was analyzed by complex wavelet transform with its compounding information and real wavelet transform respectively. The results show that main reducer fault feature points can be positioned accurately by compounding information, and the decomposition just needs scale 1 calculation, which reduces the calculation greatly for fault feature extraction.
Number of references:9
Ei main heading:Feature extraction
Ei controlled terms:Electric fault location - Extractive metallurgy - Image segmentation - Partial discharges - Signal processing - Wavelet transforms
Uncontrolled terms:Complex Morlet wavelet - Compounding nformation - Fault diagnosis - Main reducer - Complex Wavelet transforms - Complex Morlet wavelets - Singular points - Simulation results - Feature points - Mechanical faults - Fault signals - Feature extraction methods
Ei classification codes:531.1 Metallurgy - 533.1 Ore Treatment - 701.1 Electricity: Basic Concepts and Phenomena - 706.2 Electric Power Lines and Equipment - 716 Telecommunication; Radar, Radio and Television - 716.1 Information Theory and Signal Processing - 723.2 Data Processing and Image Processing - 723.5 Computer Applications - 741.1 Light/Optics - 751.1 Acoustic Waves - 921.3 Mathematical Transformations
Database:Compendex
28.Accession number:085011777202
Title:Genetic algorithm based independent component analysis method in machine fault diagnosis
Authors:Li, Liangmin; Wen, Guangrui; Wang, Shengchang; Liu, Hongmei
Author affiliation:Chang'an University, Xi'an 710064, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 11
Issue date:November 2008
Publication year:2008
Pages:p 197-202
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract:The performance of existing independent component analysis methods is highly affected by the non-linear contrast functions selected according to the distribution of original signals, and the separation results are unsatisfied. To solve this problem, an improved independent component analysis method based on genetic algorithm was proposed. Then simplified mutual entropy among signals was adopted as the optimization function. The probability of separated signals was estimated by histogram method, and the mutual entropy could be evaluated. The genetic algorithm was applied to find the optimum separation matrix to minimize the simplified mutual entropy. Simulation results show that the proposed independent component analysis method is more effective than FastICA. Finally, this method was applied to diagnose the fault of rolling bearing. The results show that modified independent component analysis method can separate the mixture of rolling bearing sound signal and electromotor signal well, and improve the diagnostic information quality.
Number of references:13
Ei main heading:Independent component analysis
Ei controlled terms:Bearings (machine parts) - Bearings (structural) - Blind source separation - Distribution functions - Electric fault currents - Entropy - Failure analysis - Genetic algorithms - Probability density function - Probability distributions - Quality assurance - Reliability
Uncontrolled terms:Fault diagnosis - Mutual entropy - Independent components - Mutual entropies - Rolling bearings - Diagnostic informations - Histogram methods - Sound signals - Original signals - FastICA - Optimization functions - Simulation results - Separation matrixes - Linear contrasts - Machine fault diagnosis
Ei classification codes:401.1 Bridges - 408.2 Structural Members and Shapes - 421 Strength of Building Materials; Mechanical Properties - 601.2 Machine Components - 641.1 Thermodynamics - 701.1 Electricity: Basic Concepts and Phenomena - 706.2 Electric Power Lines and Equipment - 716.1 Information Theory and Signal Processing - 723 Computer Software, Data Handling and Applications - 723.4 Artificial Intelligence - 913.3 Quality Assurance and Control - 921 Mathematics - 922.1 Probability Theory - 922.2 Mathematical Statistics
Database:Compendex
29.Accession number:085011777556
Title:Numerical simulation on soil wetting pattern moisture distribution and infiltration characteristics for film hole irrigation
Authors:Fan, Yanwei; Ma, Xiaoyi; Wang, Bolei; Gao, Wenqiang; Nie, Weibo
Author affiliation:Northwest A and F University, Yangling 712100, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 11
Issue date:November 2008
Publication year:2008
Pages:p 35-41
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract:Based on the theory for water movement in non-saturated soil, the mathematical model of film hole irrigation was developed to describe soil water movement of the film hole irrigation. The SWMS3D software was used to solve the model and the results were testified with laboratory experiments. The numerical simulation values are coincided with the experimental values, which show that the model is credible. Finally, the affects of irrigation water technologies elements on the soil wetting pattern, film hole infiltration volume of film hole irrigation were simulated and analyzed. The results indicate that the soil character, bulk density, initial water content, film hole diameter and irrigation water depth have slight effects on the wetting pattern, and the film hole space have obvious effects on the soil water contribution near the film hole when the film hole space is large. The soil character and bulk density have obvious effects on water infiltration characters. Meanwhile, initial water content and irrigated water depth have slight effects on water infiltration characters. The average infiltration water depth of film hole control zone with infiltration time is mainly affected by open hole ratio and film hole diameter.
Number of references:11
Ei main heading:Hydraulic models
Ei controlled terms:Computer simulation - Geologic models - Infiltration - Irrigation - Mathematical models - Seepage - Soil mechanics - Soil moisture - Soils - Underwater soils - Water content - Water supply - Water - Wetting
Uncontrolled terms:Film hole irrigation - Infiltration characteristic - Numerical simulation - Film holes - Wetting patterns - Numerical simulations - Bulk densities - Water depths - Irrigation waters - Water infiltrations - Infiltration characteristics - Open holes - Infiltration times - Soil water movements - Control zones - Experimental values - Soil waters - Laboratory experiments - Saturated soils - Water movements - Moisture distributions
Ei classification codes:407 Maritime and Port Structures; Rivers and Other Waterways - 441 Dams and Reservoirs; Hydro Development - 444 Water Resources - 446.1 Water Supply Systems - 452.1 Sewage - 471.1 Oceanography, General - 481.1 Geology - 483.1 Soils and Soil Mechanics - 632.1 Hydraulics - 723.5 Computer Applications - 802.3 Chemical Operations - 804.2 Inorganic Compounds - 821.3 Agricultural Methods - 921 Mathematics - 931.2 Physical Properties of Gases, Liquids and Solids
Database:Compendex
30.Accession number:085011777557
Title:Key technologies for the tillage system in area of dry farming of northern China
Authors:Jia, Honglei; Chen, Zhongliang; Ma, Chenglin; Liu, Zhaochen; Yang, Qing; Li, Guangyu
Author affiliation:Jilin University, Changchun 130025, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 11
Issue date:November 2008
Publication year:2008
Pages:p 59-63
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract:This paper describes the tillage technologies for the tillage system of soil water storage and preservation in the area of dry farming of northern China, with surface mulching, reduced-till and no-till as the core technologies, based on combined operations, to achieve the goal of soil water storage and preservation and improving soil fertility. It summarizes six innovative technologies involving the combined stalk and stubble management technology, in which the stalk and stubble of corn can be broken and partially buried in soil at one time; the universal technology for rototilling and stubble breaking, in which the two operations, can be done on the same blade rotor and disc; the strip reduced-till (no-till) precision seeding technology, in which less-tillage (or only furrowing) is needed in the seed bed; the ridging and film-side furrow sowing technology, in which the ridge is covered with the film and seeds are sowed in the furrow; the mechanical bionic resistance reduction technology, which uses the soil working tool designed based on bionics; and the no-till planting and blockage prevention technology, in which no-till planting is conducted in the residue free seed bed. It also shows the composition diagram of the farming system.
Number of references:21
Ei main heading:Technology
Ei controlled terms:Agricultural machinery - Agricultural products - Agriculture - Metal drawing - Seed - Soil moisture - Soils - Underwater soils
Uncontrolled terms:Key technology - Tillage - No tills - Tillage systems - Soil water storages - Key technologies - Northern chinas - Resistance reductions - Combined operations - Seeding technologies - Core technologies - Blade rotors - Farming systems - Stubble managements - Prevention technologies - Innovative technologies - Soil fertilities
Ei classification codes:471.1 Oceanography, General - 483.1 Soils and Soil Mechanics - 535.2 Metal Forming - 821 Agricultural Equipment and Methods; Vegetation and Pest Control - 821.1 Agricultural Machinery and Equipment - 821.4 Agricultural Products - 901 Engineering Profession
Database:Compendex
31.Accession number:085011777558
Title:Analysis of volatile aromatic compounds from cow's and goat's milk yoghurt by SPME-GC/MS
Authors:Ge, Wupeng; Li, Yuanrui; Chen, Ying; Yuan, Yajuan; Yang, Jing
Author affiliation:Northwest A and F University, Yangling 712100, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 11
Issue date:November 2008
Publication year:2008
Pages:p 64-69 75
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract:The volatile aromatic components in cow's milk and goat's milk yoghurt were extracted by solid-phase micro-extraction (SPME) and were analyzed by GC/MS. The results show that total 48 different compounds are isolated and identified from cow's plain yoghurt, and 50 different compounds are isolated and identified from goat's milk plain yoghurt. These compounds are carboxylic acids, alcohols and furans, aldehydes, ketones, esters, hydrocarbons, nitrogen-containing compounds, sulfur-containing compounds etc. The main volatile aromatic components of these two types of yoghurt are 2, 3-Butanedione, 2-Furanmethanol, 3-hydroxy-2-Butanone etc. The types of volatile aromatic constituents in yoghurt both cow's and goat's milk are similar. However, the contents of these different aromatic compounds are different.
Number of references:15
Ei main heading:Aromatic hydrocarbons
Ei controlled terms:Aldehydes - Aromatic compounds - Aromatization - Carboxylic acids - Esters - Extraction - Hydrocarbons - Ketones - Organic acids - Organic compounds -Sulfur
Uncontrolled terms:Cow's milk yoghurt - GC/MS analysis - Goat's milk yoghurt - Volatile aromatic compounds - Goat's milks - Aromatic components - Aromatic constituents - Two types
Ei classification codes:802.2 Chemical Reactions - 802.3 Chemical Operations - 803 Chemical Agents and Basic Industrial Chemicals - 804 Chemical Products Generally - 804.1 Organic Compounds
Database:Compendex
32.Accession number:085011777164
Title:1-dimensional simulation on influence of EGR on diesel engine operating process
Authors:Yang, Shuai; Zhou, Yi; Zou, Renling; Liu, Jiyue; Xu, Huixing; Dong, Anqi
Author affiliation:Tongji University, Shanghai 201804, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 11
Issue date:November 2008
Publication year:2008
Pages:p 1-5
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract:According to the basic structure of diesel engine, 1-dimensional model of TDI diesel engine with EGR system was established. An EGR control unit was constructed using the optimum EGR rates map of diesel engine test experiment as control map of EGR control unit. Subsequently, a 1-dimensional simulation about the influence of EGR on the whole operating process of diesel engine was carried out, and it was realized that EGR rates was continuously changing with diesel engine rotate speed and load when EGR was used in diesel engine. Taking diesel engine rotate speed 1900 r/min and load 10% as an example, the simulation results show that A/F ratio, cylinder pressure, the temperature in the cylinder and exhaust gas temperature are decreased and the gas mass in the cylinder is increased when EGR is used in the diesel engine. All conclusions of simulation are identical with that of the diesel engine test experiment.
Number of references:7
Ei main heading:Diesel engines
Ei controlled terms:Cylinders (shapes) - Diesel locomotives - Engine cylinders - Engines - Interchanges
Uncontrolled terms:Exhaust gas recirculation - Operating process - Simulation - Turbocharged direct-injected (TDI) diesel engine - Operating processes - Control units - Rotate speeds - Egrrates - Exhaust gas temperatures - Control maps - Gas masses - Cylinder pressures - A/f ratios - Simulation results - Egr systems - Dimensional models - Basic structures
Ei classification codes:406.1 Highway Systems - 408.2 Structural Members and Shapes - 612 Engines - 612.1.1 Internal Combustion Engine Components - 612.2 Diesel Engines - 617.3 Steam Engines - 654.2 Rocket Engines - 682.1.2 Locomotives
Database:Compendex
33.Accession number:085011777165
Title:Characteristics analysis of double valves fuel system with high pressure
Authors:Qiu, Tao; Liu, Xinghua; Liu, Fushui; Hu, Jiancun
Author affiliation:Beijing Institute of Technology, Beijing 100081, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 11
Issue date:November 2008
Publication year:2008
Pages:p 6-9
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract:A double electronic valves fuel system was established by adopting an electronic unit pump and an electronic injector of common rail. The electronic unit pump is used for fuel supply adjusting and the electronic injector of common rail is used for fuel injection control. Subsequently, the characteristics of the fuel system were analyzed by experiment and simulation. The different fuel injection laws were obtained with different time intervals from fuel supply advance angle to fuel injection advance angle. The pilot injection was realized by means of two times injector controls during the course of fuel supply. With prolonged fuel supply time, the high pressure injection was realized at low speed. The results show that the double valves fuel system reserves the advantages of traditional fuel system and has the more flexible characteristics during the circle of diesel, which will be more favorable to the dynamic performance of diesel.
Number of references:4
Ei main heading:Fuels
Ei controlled terms:Fuel injection - Fuel systems - Jet pumps - Mechanisms - Pumps - Rails - Valves (mechanical)
Uncontrolled terms:Diesel - Electronic valve - Fuel supplies - High pressures - Electronic valves - Common rails - Electronic unit pumps - Time intervals - Flexible characteristics - Traditional fuels - Low speeds - Pilot injections - Injection advance angles - Dynamic performances - Fuel supply advance angles - Fuel injection controls - Characteristics analyses
Ei classification codes:521 Fuel Combustion and Flame Research - 522 Gas Fuels - 523 Liquid Fuels - 524 Solid Fuels - 601.2 Machine Components - 601.3 Mechanisms - 618.2 Pumps - 619.1.1 Pipe Accessories - 619.2.1 Tank Accessories - 681.1 Railway Plant and Structures, General
Database:Compendex
34.Accession number:085011777166
Title:Effect of additive on starting-up performance of a compressed ignition natural gas engine
Authors:Zheng, Qingping; Zhang, Huiming; Zhu, Zhiqiang
Author affiliation:Hebei University of Technology, Tianjin 300130, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 11
Issue date:November 2008
Publication year:2008
Pages:p 10-12
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract:Adopting the Di-tertiary-butyl peroxide as the additive, the starting-up performance of a compressed ignition natural gas engine was studied experimentally. The results show that the starting-up performance of engine is improved by adding certain Di-tertiary-butyl peroxide additives. During starting-up, if the mass fraction of Di-tertiary-butyl peroxide additive reaches to 14.2%, engine ignition can be realized at ambient temperature with a glow plug of 750擄C. If the glow plug temperature reaches to 1120擄C, engine ignition can be realized at ambient temperature with a mass fraction of Di-tertiary-butyl peroxide additive below 6.7%. However, an excessive additive will lead to the engine knocking.
Number of references:6
Ei main heading:Gas engines
Ei controlled terms:Additives - Engines - Gas industry - Gases - Ignition - Internal combustion engines - Natural gas - Oxidation - Starting - Temperature
Uncontrolled terms:Compressed ignition - Natural gas engine - Natural gas engines - Mass fractions - Ambient temperatures - Glow plugs
Ei classification codes:521.1 Fuel Combustion - 522 Gas Fuels - 612 Engines - 612.1 Internal Combustion Engines, General - 612.3 Gas Turbines and Engines - 617 Turbines and Steam Turbines -617.3 Steam Engines - 641.1 Thermodynamics - 654.2 Rocket Engines - 661.1 Automotive Engines - 705.1 Electric Machinery, General - 802.2 Chemical Reactions - 803 Chemical Agents and Basic Industrial Chemicals - 804 Chemical Products Generally - 911.2 Industrial Economics - 931.2 Physical Properties of Gases, Liquids and Solids
Database:Compendex
35.Accession number:085011777167
Title:Map generation for steady state air fuel ratio feed-forward control of a coal-bed gas engine
Authors:Teng, Qin; Ma, Biao; Zuo, Chengji; Tan, Jian
Author affiliation:Hefei University of Technology, Hefei 230009, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 11
Issue date:November 2008
Publication year:2008
Pages:p 13-17 5
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract:Based on the physical characteristics of the intake system in a coal-bed gas engine equipped with two-valve type gas mixer, a hierarchical model for steady state air fuel ratio feed-forward control was established using mean value and polynomial regression analysis as well as fuzzy-neural network modelling methods. A 3D original control MAP graph was generated from the model. By means of an identified adaptive neural fuzzy inference system (ANFIS) model of the excess air factor, the simulation of static state air fuel ratio feed-forward control was carried out. Subsequently, the actual engine control experiment was performed with data produced by the feed-forward control model. The results show that the feed-forward control model has good predication ability. Maximal and average prediction errors of the model are less than 8% and 5%, respectively.
Number of references:10
Ei main heading:Coal gas
Ei controlled terms:Adaptive control systems - Coal deposits - Coal industry - Coal - Fuzzy inference - Fuzzy systems - Gas engines - Gas fuel analysis - Gases - Hierarchical systems - Internal combustion engines - Maps - Natural gas wells - Neural networks - Optimal control systems - Regression analysis - Three dimensional
Uncontrolled terms:Air fuel ratio - Static state model - Air fuel ratios - Steady states - Static states - Control models - Engine controls - Excess airs - Adaptive Neural fuzzy Inference systems - Hierarchical models - Control maps - Network modelling methods - Polynomial regressions - Average prediction errors - Mean values - Physical characteristics - Map generations
Ei classification codes:405.3 Surveying - 461.1 Biomedical Engineering - 482 Mineralogy - 503 Mines and Mining, Coal - 512.2.1 Natural Gas Fields - 522 Gas Fuels - 524 Solid Fuels - 612.1 Internal Combustion Engines, General - 612.3 Gas Turbines and Engines - 721.1 Computer Theory, Includes Formal Logic,Automata Theory, Switching Theory, Programming Theory - 723.4 Artificial Intelligence - 723.4.1 Expert Systems - 723.5 Computer Applications - 731.1 Control Systems - 801 Chemistry - 902.1 Engineering Graphics - 911 Cost and Value Engineering; Industrial Economics - 913 Production Planning and Control; Manufacturing - 921.4 Combinatorial Mathematics, Includes Graph Theory, Set Theory - 921.5 Optimization Techniques - 922.2 Mathematical Statistics - 931.2 Physical Properties of Gases, Liquids and Solids - 961 Systems Science
Database:Compendex
36.Accession number:085011777168
Title:Characteristics and affecting factors of combustion noise in dual-fuel engine
Authors:Tang, Dong; Shen, Fei; Lai, Chaofeng; Luo, Fuqiang
Author affiliation:Jiangsu University, Zhenjiang 212013, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 11
Issue date:November 2008
Publication year:2008
Pages:p 18-21 9
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract:The combustion noise of a biogas and diesel dual-fuel engine is evaluated by time region and frequency region comprehensively. The effects of engine rotate speed, engine load, the advance angles of fuel supply and the biogas replacement rate on the combustion noise were analyzed. The result shows that the total combustion sound pressure level is less affected by the engine rotate speed at 21擄CA BTDC (crankshaft angle before top dead center). The combustion sound pressure level increases with the increasing of the engine load at the same engine rotate speed. The cylinder pressures of the two types of engines change markedly when the fuel supply advance angle increases to 24擄CA BTDC. The increasing of engine rotate speed results in the oscillation of the cylinder pressure at high frequencies, and the cylinder pressure increases with the increasing of engine load at low and middle frequencies.
Number of references:12
Ei main heading:Engine cylinders
Ei controlled terms:Acoustic variables measurement - Acoustic wave transmission - Biogas - Combustion - Crankshafts - Cylinders (shapes) - Engines - Fuels - Smoke - Speed - Thermochemistry - Ultrasonics
Uncontrolled terms:Cylinder pressure frequency spectrum - Dual-fuel engine - Noise - Cylinder pressures - Rotate speeds - Engine loads - Combustion noises - Sound pressure levels - Two types - Fuel supplies - Dead centers - Crankshaft angles - Frequency regions - High frequencies - Fuel supply advance angles - Time regions - Affecting factors
Ei classification codes:408.2 Structural Members and Shapes - 451.1 Air Pollution Sources - 521.1 Fuel Combustion - 522 Gas Fuels - 523 Liquid Fuels - 524 Solid Fuels - 601.2 Machine Components - 612 Engines - 612.1.1 Internal Combustion Engine Components - 617.3 Steam Engines - 641.1 Thermodynamics - 654.2 Rocket Engines - 751.1 Acoustic Waves - 751.2 Acoustic Properties of Materials - 753.1 Ultrasonic Waves - 801.3 Colloid Chemistry - 801.4 Physical Chemistry - 804 Chemical Products Generally - 821.5 Agricultural Wastes - 931.1 Mechanics - 931.2 Physical Properties of Gases, Liquids and Solids - 941.2 Acoustic Variables Measurements
Database:Compendex
37.Accession number:085011777169
Title:Reliable design of drive circuit for automotive EPS controller
Authors:Zhao, Jingbo; Chen, Long; Jiang, Haobin
Author affiliation:Jiangsu University, Zhenjiang 212013, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 11
Issue date:November 2008
Publication year:2008
Pages:p 22-25
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract:The working principle and key technologies for reliable design of EPS controller were analyzed. The signal processing circuit and the power drive circuit were hierarchically designed to improve the anti-jamming capability and reliability. The PWM frequency was selected considering the relationship between the PWM frequency and the natural frequency of the mechanical system, the influence on the armature current ripple and the noise impact on people. Meanwhile, the influence of switching current pulse on the safety of the transistors and the motor should be taken into account. Three MOS transistors were paralleled for the economy, the heat dissipation and the reliability. The heat dissipation flake and its relevant parameters were selected to improve the drive efficiency and the stable operation capability.
Number of references:6
Ei main heading:Steering
Ei controlled terms:Counting circuits - Electric generators - Noise pollution - Pulse modulation - Pulse width modulation - Reliability - Signal processing - Transistor transistor logic circuits - Transistors
Uncontrolled terms:Controller - Drive circuit - Electric power steering - Heat dissipations - Reliable designs - Drive circuits - Power drives - Noise impacts - Switching currents - Armature currents - Signal processing circuits - Mechanical systems - Mos transistors - Stable operations - Key technologies - Working principles
Ei classification codes:421 Strength of Building Materials; Mechanical Properties - 461.7 Health Care - 662.4 Automobile and Smaller Vehicle Components - 663.2 Heavy Duty Motor Vehicle Components - 671.2 Ship Equipment - 705.2 Electric Generators - 713.4 Pulse Circuits - 714.2 Semiconductor Devices and Integrated Circuits - 716 Telecommunication; Radar, Radio and Television - 716.1 Information Theory and Signal Processing - 721.2 Logic Elements - 721.3 Computer Circuits - 751.4 Acoustic Noise - 913.3 Quality Assurance and Control - 922.2 Mathematical Statistics
Database:Compendex
38.Accession number:085011777170
Title:Parameter optimization of rotary valve in the flow control type ECHPS system
Authors:Guo, Xiaolin; Ji, Xuewu; Chen, Kuiyuan
Author affiliation:Academy of Armored Forces Engineering, Beijing 100072, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 11
Issue date:November 2008
Publication year:2008
Pages:p 26-29 47
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract:The rotary valve parameters have significant influences on the assist effort characteristics of the flow control type electronic controlled hydraulic power steering (ECHPS) system. The calculating procedures of the equivalent flow area and assist effort characteristics of a flow control type ECHPS system were analyzed using the principles of hydraulic resistance networks. The mathematical relations between the orifice area of the rotary valve and the configurable design parameters (the metering edge width, the metering edge eccentric distance, the flange width and the slot length of the input shaft) were deducted. Subsequently, the optimum parameters of the rotary valve were obtained by optimization design technique. The values of these parameters were optimized from 0.9 mm, 10 mm, 5.76 mm and 11 mm to 1.115 mm, 4.626 mm, 5.652 mm and 4.499 mm. The numerical simulation results show that the alterable assist effort range is increased from 1.2 to 3, and the maximal steering wheel force is 4 N路m in low speed.
Number of references:9
Ei main heading:Valves (mechanical)
Ei controlled terms:Control systems - Elastic moduli - Flow control - Hydraulics - Optimization - Structural optimization
Uncontrolled terms:Assist effort characteristic - Electronic controlled hydraulic power steering - Rotary valve - Rotary valves - Metering edges - Hydraulic power steering - Design Parameters - Steering wheels - Configurable - Flow areas - Orifice areas - Optimum parameters - Mathematical relations - Optimization designs - Numerical simulations - Slot lengths - Low speeds - Flange widths - Eccentric distances - Hydraulic resistances - Parameter optimizations
Ei classification codes:421 Strength of Building Materials; Mechanical Properties - 422.2 Test Methods - 601.2 Machine Components - 619.1.1 Pipe Accessories - 619.2.1 Tank Accessories - 631.1 Fluid Flow, General - 632.1 Hydraulics - 731.1 Control Systems - 731.3 Specific Variables Control - 921.5 Optimization Techniques - 951 Materials Science
Database:Compendex
39.Accession number:085011777171
Title:FEM simulation and thermal analysis of functional gradient materials as thermal barrier coating of piston top
Authors:Feng, Yijian; Du, Shuangsong; Cheng, Jigui; Hu, Xianguo
Author affiliation:Hefei University of Technology, Hefei 230009, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 11
Issue date:November 2008
Publication year:2008
Pages:p 30-34
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract:The temperature and thermal stress distributions of ceramics/metal functional gradient cylinder were simulated by finite element method (FEM). Using the indirect solution method of thermal analysis and subsequently structural analysis of ANSYS10.0 software, the simulations were carried out under stable working conditions and the third type boundary conditions of piston in IC engine. The effects of gradient composition distribution index p on the temperature of piston head and the thermal stress at the gradient layers of ceramics/metal were studied respectively. Finally, the optimal design result corresponding to the gradient composition distribution index p=0.6 was obtained for easing the thermal stress.
Number of references:9
Ei main heading:Finite element method
Ei controlled terms:Boundary value problems - Engine pistons - Plastic coatings - Strength of materials - Stress concentration - Structural analysis - Thermal barrier coatings - Thermal stress - Thermoanalysis - Thermoelasticity
Uncontrolled terms:Functional gradient coating - Thermal analysis - Composition distributions - Functional gradients - Working conditions - Functional gradient materials - Optimal designs - Gradient layers - Piston heads - Solution methods - IC engines - Stress distributions - FEM simulations
Ei classification codes:408.1 Structural Design, General - 421 Strength of Building Materials; Mechanical Properties - 422 Strength of Building Materials; Test Equipment and Methods - 539.2.2 Protecting Materials - 612.1.1 Internal Combustion Engine Components - 801 Chemistry - 813.2 Coating Materials - 817.2 Polymer Applications - 921.6 Numerical Methods - 931.2 Physical Properties of Gases, Liquids and Solids - 951 Materials Science
Database:Compendex
40.Accession number:085011777559
Title:Effects of different drying methods on drying characteristic of Chaenomeles sinensis (Thouin) Koehne
Authors:Zhang, Lihua; Xu, Huaide; Li, Shunfeng
Author affiliation:Northwest A and F University, Yangling 712100, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 11
Issue date:November 2008
Publication year:2008
Pages:p 70-75
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract:With the aim to improve the quality of Chaenomeles sinensis (Thouin) Koehne slices, its hot-air drying (60擄C, 70擄C, 80擄C), microwave drying (210 W, 350 W, 560 W) and combined hot-air (70擄C)/microwave (210 W) drying experiments were carried out respectively. The results show that the drying rate of Chaenomeles sinensis (Thouin) Koehne slices moisture is declining mostly during the drying process. There is a slightly drying rate accelerating period and there is not constant drying rate period during the whole drying process. The drying mathematical model accords with Page formula. For the drying experiments, the hot-air drying took the longest drying time, the combined drying experiments followed and the microwave drying took the shortest drying time. The total flavonoids content retained the highest by the combined drying and the 60擄C hot-air drying, which were 1.98% and 1.94%. 螖 E of the 70擄C hot-air drying was closed to that of the fresh material. However, the color of Chaenomeles sinensis (Thouin) Koehne slices of all the hot-air drying was better than that of the combined drying.
Number of references:17
Ei main heading:Dewatering
Ei controlled terms:Curing - Drying - Experiments - Mathematical models - Microwave heating - Microwaves
Uncontrolled terms:Chaenomeles sinensis (Thouin) Koehne - Characteristic analysis - Air drying - Combined drying - Drying processes - Drying rates - Drying times - Microwave drying - Total flavonoids - Constant drying rate periods - Drying characteristics - Drying methods
Ei classification codes:642.1 Process Heating - 711 Electromagnetic Waves - 711.1 Electromagnetic Waves in Different Media - 802.2 Chemical Reactions - 802.3 Chemical Operations - 815.1 Polymeric Materials - 818.3 Rubber and Elastomer Processing - 901.3 Engineering Research - 921 Mathematics
Database:Compendex
41.Accession number:085011777560
Title:Incubation control system of fuzzy neural network based on gray prediction
Authors:Wu, Shuci; Zhou, Guoxiong; Wang, Xiangzhong
Author affiliation:Central South University of Forestry and Technology, Changsha 410004, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 11
Issue date:November 2008
Publication year:2008
Pages:p 109-112
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract:A fuzzy neural network control strategy based on gray prediction was presented and applied in control system of incubation process. The main parameters of incubation were predicted by gray prediction. The dynamic characteristics were controlled by fuzzy neural network to keep the accuracy and stability. The simulated results show that the system can make the object stable in 50 s, and it has good dynamic and static characteristics.
Number of references:8
Ei main heading:Fuzzy control
Ei controlled terms:Control systems - Forecasting - Fuzzy neural networks - Image classification - Neural networks
Uncontrolled terms:Gray prediction - Incubation - Simulation - Gray predictions - Simulated results - Static characteristics - Dynamic characteristics - Main parameters - Neural Network controls
Ei classification codes:461.1 Biomedical Engineering - 716 Telecommunication; Radar, Radio and Television - 723.4 Artificial Intelligence - 723.5 Computer Applications - 731 Automatic Control Principles and Applications - 731.1 Control Systems - 912.2 Management - 921 Mathematics - 922.2 Mathematical Statistics
Database:Compendex
42.Accession number:085011777172
Title:Influence of fusing agent on biomass ash melting point and biomass chars gasification
Authors:Zhao, Hui; Han, Shuxin; Sheng, Shuiping; Zhou, Jingsong; Luo, Zhongyang; Cen, Kefa
Author affiliation:Hangzhou Special Equipment Inspection Institute, Hangzhou 310003, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 11
Issue date:November 2008
Publication year:2008
Pages:p 42-47
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract:With the aim to ensure biomass entrained-flow gasification in a slagging gasifier, the characteristics of biomass fusing ash using CaO and Fe2O3 as fusing agent were investigated respectively by experiments. Subsequently, the influence of fusing agent on the gasification reactivity of biomass chars was studied. The results indicate that when the weight percent of CaO is 0.3-0.4, the melting point drops down apparently; when the weight percent of CaO is higher than 0.4, the melting point increases. While the addition of Fe2O3 increases at 0-0.5, the melting point decreases sharply. When the amounts of CaO and Fe2O3 are low, they can promote the reaction rate of char gasification. However, as the amounts of two additives increase, the fusing agents attach on the porous surface of chars and prevent the gas from the surface of chars, so the gasification reactivity decreases.
Number of references:9
Ei main heading:Melting point
Ei controlled terms:Agents - Biological materials - Biomass - Gas generators -Gasification - Melting - Rate constants - Reaction rates - Renewable energy resources - Steelmaking - Thermochemistry
Uncontrolled terms:Ash melting point - Biomass energy - Char - Entrained-flow - Fusing agent
Ei classification codes:461.2 Biological Materials and Tissue Engineering - 522 Gas Fuels - 525.1 Energy Resources and Renewable Energy Issues - 531.1 Metallurgy - 545.3 Steel - 641.1 Thermodynamics - 801.4 Physical Chemistry - 802.1 Chemical Plants and Equipment - 802.2 Chemical Reactions - 802.3 Chemical Operations - 803 Chemical Agents and Basic Industrial Chemicals - 804.1 Organic Compounds - 804.2 Inorganic Compounds - 805.1.1 Biochemical Engineering - 821.5 Agricultural Wastes - 931.2 Physical Properties of Gases, Liquids and Solids
Database:Compendex
43.Accession number:085011777173
Title:Movement analysis of cereal in axial flow threshing roller space
Authors:Yang, Fangfei; Yan, Chuliang
Author affiliation:Chinese Academy of Agricultural Mechanization Sciences, Beijing 100083, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 11
Issue date:November 2008
Publication year:2008
Pages:p 48-50 25
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract:The axial flow threshing roller of 4LZ-3 combine harvester was divided into three sectors: feeding sector, threshing sector and separation sector. The movement of cereal passing through each sector was analyzed based on reasonable assumptions. Subsequently, formulas of absolute velocity, relative velocity and axial direction velocity were deduced considering the friction force. The results show that the helix angle of feeding sector should be smaller than the complementary angle of friction angle between cereal and helix lamina, helix angle of threshing sector and separation sector should be smaller than friction angle between cereal and leading lathing respectively.
Number of references:6
Ei main heading:Agriculture
Ei controlled terms:Axial flow - Feeding - Friction - Harvesters - Rollers (machine components) - Tribology
Uncontrolled terms:Combine harvester - Movement - Threshing - Helix angles - Combine harvesters - Angle of frictions - Friction forces - Friction angles - Axial directions - Relative velocities - Movement analysis
Ei classification codes:601.2 Machine Components - 631.1 Fluid Flow, General - 691.2 Materials Handling Methods - 821 Agricultural Equipment and Methods; Vegetation and Pest Control - 821.1 Agricultural Machinery and Equipment - 931 Classical Physics; Quantum Theory; Relativity - 931.1 Mechanics - 931.2 Physical Properties of Gases, Liquids and Solids
Database:Compendex
44.Accession number:085011777174
Title:Analysis and experiment on influencing factors of range and spraying uniformity for complete fluidic sprinkler
Authors:Liu, Junping; Yuan, Shouqi; Li, Hong; Zhu, Xingye
Author affiliation:Jiangsu University, Zhenjiang 212013, China
Serial title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated serial title:Nongye Jixie Xuebao
Volume:v 39
Issue:n 11
Issue date:November 2008
Publication year:2008
Pages:p 51-54
Language:Chinese
ISSN:1000-1298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, Beijing, 100083, China
Abstract:The factors affecting the range of complete fluidic sprinkler are inlet press, sprinkler elevation, sectional area, rotate speed, step frequency, pipe length, and signal junction depth. An experimental study on the influence of these factors on the range respectively was carried out. The experimental results show that the inlet press and sectional area are direct proportion to the range of the sprinkler, the rotate speed and step frequency are inverse proportion to the range of the sprinkler, and the pipe length and signal junction depth have less influence on the range of the sprinkler. Subsequently, the orthogonal test of five factors and four levels was conducted on inlet press, sprinkler elevation, sectional area, pipe length, and signal junction depth. The results were analyzed with the method of synthesis point rating. The influencing factors of range are inlet press, sprinkler elevation, sectional area, signal junction depth, and pipe length in sequence.
Number of references:11
Ei main heading:Pipe
Ei controlled terms:Experiments - Presses (machine tools)
Uncontrolled terms:Complete fluidic sprinkler - Influencing factor - Orthogonal test - Range - Junction depths - Influencing factors - Step frequencies - Rotate speeds - Orthogonal tests - Inverse proportions - Synthesis points - Experimental studies
Ei classification codes:603.1 Machine Tools, General - 619.1 Pipe, Piping and Pipelines - 901.3 Engineering Research
Database:Compendex
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