Title:Experiment of the Flow Field at the Outlet of Impeller of Axial-Flow Pump

2009年第40卷第9期共收录45篇

1.Accession number:20094512432519

Title:Experiment of the flow field at the outlet of impeller of axial-flow pump

Authors:Li, Zhong1 ; Yang, Minguan1 ; Wang, Chunlin1

Author affiliation:1 School of Energy and Power Engineering, JiangsuUniversity, Zhenjiang 212013, China

Corresponding author:Li, Z. ()

Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery

Abbreviated source title:Nongye Jixie Xuebao

Volume:40

Issue:9

Issue date:September 2009

Publication year:2009

Pages:94-97

Language:Chinese

ISSN:10001298

CODEN:NUYCA3

Document type:Journal article (JA)

Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China

Abstract:The flow field at the outlet of impeller in the designed axial-flow pump was measured by using the five-hole probe. Threevelocity components and circulation curves were obtained. The measured results show that the flow field at the outlet of impeller is a spiral movement. Under the optimum condition, the rotary kinetic energy occupies 34% of the total outlet kinetic energy and decreases with the increase of the flux. Accompanied by the small radial velocity, the axial velocity increases with the flow intensifying. The velocity circulation decrease from the hub to the flange, wherefore the more circular velocity at the flange and the less at the hub are needed. The 3-D velocity distribution of flow field can be measured accurately by the probe. This method has the merits of simple operation and well applicability.

Number of references:8

Main heading:Velocity distribution

Controlled terms:Electron energy loss spectroscopy - Flanges - Flow fields - Kinetic energy - Probes - Pumps - Velocity

Uncontrolled terms:Axial velocity - Axial-flow pump - Five-hole probe - Measured results - Optimum conditions - Radial velocity - Simple operation - Velocity components

Classification code:944 Moisture, Pressure and Temperature, and Radiation Measuring Instruments - 943.2 Mechanical Variables Measurements - 943 Mechanical and Miscellaneous Measuring Instruments - 942 Electric and Electronic Measuring Instruments - 941 Acoustical and Optical Measuring Instruments - 932.2 Nuclear Physics - 931.3 Atomic and Molecular Physics - 931.1 Mechanics - 922.2 Mathematical Statistics - 801 Chemistry - 631.1 Fluid Flow, General - 619.1.1 Pipe Accessories - 618.2 Pumps

Database:Compendex

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2.Accession number:20094512432544

Title:Dynamic analysis of the machine drive screw

Authors:Zhang, Huiduan1 ; Tan, Qingchang1 ; Li, Qinghua2

Author affiliation:1 College of Mechanical Science and Engineering, JilinUniversity, Changchun 130025, China 2 College of Machinery Engineering, ChangchunUniversity, Changchun 130025, China

Corresponding author:Zhang, H. ()

Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery

Abbreviated source title:Nongye Jixie Xuebao

Volume:40

Issue:9

Issue date:September 2009

Publication year:2009

Pages:220-226

Language:Chinese

ISSN:10001298

CODEN:NUYCA3

Document type:Journal article (JA)

Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China

Abstract:The drive screw was simplified as a rotating Timoshenko beam bearing the pre-tension force and moving forces, and the frequency equation of the screw with the elastic end supports was derived under considering the effect of gyroscope, the pre-tension force, the moving forces on the screw vibration, and the bearing stiffness. The dynamic model of the drive screw was established using Lagrange equation, and was analyzed adopting the mode superposition and Runge-Kutta method to calculate the transient response. Eventually, the effect of the system parameters on the whirl speed and lateral vibration was studied to supply a base for designing the drive system.

Number of references:10

Main heading:Dynamic response

Controlled terms:Bearings (structural) - Dynamic analysis - Equations of motion - Rotation - Runge Kutta methods

Uncontrolled terms:Bearing stiffness - Drive systems - Frequency equation - Lagrange equation - Lateral vibration - Lateral vibrations - Machine drives - Mode superposition - Moving forces - Pre-tension - Timoshenko beams - Transient response - Whirl speed

Classification code:921.6 Numerical Methods - 921.2 Calculus - 601.1 Mechanical Devices - 931.1 Mechanics - 422.2 Test Methods - 408.1 Structural Design, General - 401.1 Bridges - 408.2 Structural Members and Shapes

Database:Compendex

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3.Accession number:20094512432531

Title:Optimization on the crystallization of fructose

Authors:Yan, Xudong1 ; Yang, Ruijin2 ; Hua, Xiao2 ; Zhang, Wenbin2

Author affiliation:1 State Key Laboratory of Food Science and Technology, JiangnanUniversity, Wuxi 214122, China 2 School of Food Science and Technology, JiangnanUniversity, Wuxi 214122, China

Corresponding author:Yang, R. ()

Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery

Abbreviated source title:Nongye Jixie Xuebao

Volume:40

Issue:9

Issue date:September 2009

Publication year:2009

Pages:155-160

Language:Chinese

ISSN:10001298

CODEN:NUYCA3

Document type:Journal article (JA)

Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China

Abstract:The improvement of the crystalline technique of fructose was reported. The effect of sucrose ester S570 and surfactant Span 60 on crystals was studied, and the results show that the CV of crystals can be reduced by 51.5% when adding 100mg/kg Span 60. The optimal glucoamylase is utilized to hydrolyze oligosaccharides in fructose syrup, under the optimal conditions: enzymes/oligosaccharides 600mg/kg and hydrolysis time 20h, pH value 4.0, reaction temperature 55°C, fructose syrup concentration 60%. The optimized cooling-crystallization conditions are as follows, seeds amount 2%, initial supersaturation degree 1.02-1.08, cooling rate before adding ethanol 0.4°C/h, ethanol concentration 0.2, cooling rate after adding ethanol: 0.28°C/h (52-46°C), 0.55°C/h (46-43°C), 0.80°C/h (43-35°C), 0. 90°C/h (35-25°C). With the optimized parameters, the final product yield is 56.92%, and the mean size is 221.9μm.

Number of references:14

Main heading:Enzymatic hydrolysis

Controlled terms:Cooling - Crystalline materials - Crystallization - Enzymes - Esters - Ethanol - Fructose - Optimization - Sugar (sucrose) - Surface active agents

Uncontrolled terms:Cooling rates - Crystalline fructose - Crystallization conditions - Ethanol concentrations - Glucoamylase - Mean size - Optimal conditions - Optimized parameter - pH value - Product yields - Reaction temperature - Sucrose esters - Supersaturation degree - Surfactant

Classification code:933.1 Crystalline Solids - 802.3 Chemical Operations - 803 Chemical Agents and Basic Industrial Chemicals - 804.1 Organic Compounds - 804.2 Inorganic Compounds - 822.3 Food Products - 921.5 Optimization Techniques - 802.2 Chemical Reactions - 641.2 Heat Transfer - 531.2 Metallography - 523 Liquid Fuels - 482.2 Minerals - 461.2 Biological Materials and Tissue Engineering - 801.2 Biochemistry

Database:Compendex

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4.Accession number:20094512432534

Title:Double three-point fix and objective diagram fitting controlling of farming robot

Authors:Yan, Qinlao1 ; Gao, Chi2 ; Zha, Guangxing1 ; Cheng, Zhengwei1 ; Xue, Shaoping1

Author affiliation:1 College of Mechanical and Electronic Engineering, Northwest A and F University, Yangling, Shaanxi 712100, China 2 Mechanical and Electronic Department, Laiwu Vocational and TechnicalCollege, Laiwu 271100, China

Corresponding author:Xue, S. ()

Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery

Abbreviated source title:Nongye Jixie Xuebao

Volume:40

Issue:9

Issue date:September 2009

Publication year:2009

Pages:171-174

Language:Chinese

ISSN:10001298

CODEN:NUYCA3

Document type:Journal article (JA)

Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China

Abstract:In order to raise position and posture precision of farming robot, double three-point fix disposition principle and method of farming autonomous mobile robot were proposed which were used to implement position and posture precision of the robot when it was moving independently, and the laser survey sensor and ultra audible sound receiving sensor were employed to build up the measure and test system and realized examination. The experiments show that operation speed and controlling precision are increased by using the methods, its absolute error is aggrandized, whereas its relativeerror is reduced obviously, and it is sensitive for barrier on the ground, and its stability can enhance by raising its weight.

Number of references:6

Main heading:Robots

Controlled terms:Sensors

Uncontrolled terms:Absolute error - Audible sound - Autonomous Mobile Robot - Double three-point - Farming robot - Fitting - Operation speed - Position and posture - Relative errors - Test systems

Classification code:731.5 Robotics - 731.6 Robot Applications - 732.2 Control Instrumentation - 801 Chemistry

Database:Compendex

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5.Accession number:20094512432539

Title:Design of force balance for 2-DOF nanopositioning magnetic levitation stage

Authors:Cheng, Lingli1 ; Yu, Xiaofen1

Author affiliation:1 School of Instrument Science and Optoelectronic Engineering, Hefei University of Technology, Hefei 230009, China

Corresponding author:Yu, X. ()

Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery

Abbreviated source title:Nongye Jixie Xuebao

Volume:40

Issue:9

Issue date:September 2009

Publication year:2009

Pages:197-200

Language:Chinese

ISSN:10001298

CODEN:NUYCA3

Document type:Journal article (JA)

Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China

Abstract:In order to eliminate the additional moments of force, the magnetic force, gravity force and friction force were studied in a novel two-degree-of-freedom (2-DOF) nanopositioning magnetic levitation stage. The structure of the nanopositioning stage was designed in terms of the theory of force balance, then, the direction and coordinate point of the drive force of the nanomotor were gained. The experiment of linearity and repeatability of the stage were carried out, and the experiments results indicated that the yaw error was less than 5 arcsec, the pitch error was less than 15 arcsec and the repeatability of these two errors were nearly 1 arcsec per one millimeter. The stage movement was stable.

Number of references:6

Main heading:Suspensions (components)

Controlled terms:Magnetic levitation - Magnetic levitation vehicles - Magnetism

Uncontrolled terms:Additional moment - Drive force - Force balances - Friction force - Gravity forces - Magnetic force - Magnetic suspension forces - Nano-positioning - Nanomotors - Nanopositioning stage - Pitch errors - Two-degree-of-freedom

Classification code:601.2 Machine Components - 682 Railroad Rolling Stock - 701.2 Magnetism: Basic Concepts and Phenomena - 708.4 Magnetic Materials

Database:Compendex

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6.Accession number:20094512432508

Title:Dynamic substructure tire model based on modified craig-bampton method

Authors:Zhang, Xiaoyang1 ; Sun, Beibei1 ; Chen, Nan1 ; Sun, Qinghong1

Author affiliation:1 School of Mechanical Engineering, SoutheastUniversity, Nanjing 211189, China

Corresponding author:Zhang, X. ()

Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery

Abbreviated source title:Nongye Jixie Xuebao

Volume:40

Issue:9

Issue date:September 2009

Publication year:2009

Pages:41-45

Language:Chinese

ISSN:10001298

CODEN:NUYCA3

Document type:Journal article (JA)

Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China

Abstract:An approach to modeling parameterized FEM tire based on experimental modal parameters was proposed. Natural frequencies, mode shapes and damping ratios of FEM tire model with the optimal parameters had good agreement with modes acquired by the experiment. With Craig-Bampton method and tire-ground contact characteristic obtained from tire static radial compression experiment, normal and constraint modes of FEM tire model were extracted for building dynamic substructure model of tire. The coupling of tire substructure model and vehicle multi-body model was realized through modal synthesis, which can contribute to vehicle dynamic simulation and optimization design.

Number of references:11

Main heading:Finite element method

Controlled terms:Computer simulation - Dynamic models - Modal analysis - Tires - Vehicles

Uncontrolled terms:Building dynamics - Constraint modes - Damping ratio - Dynamic substructure - Ground contacts - Modal parameters - Modal synthesis - Mode shapes - Multi-body models - Optimal parameter - Parameterized - Radial compression - Test modal method - Tire models - Vehicle dynamic model - Vehicle dynamic simulation

Classification code:432 Highway Transportation - 723.5 Computer Applications - 818.5 Rubber Products - 921 Mathematics - 921.6 Numerical Methods

Database:Compendex

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7.Accession number:20094512432503

Title:Rapid control prototyping experiment of automated clutch based on dSPACE

Authors:Zhao, Yongsheng1 ; Liu, Zhifeng1 ; Yang, Wentong1 ; Cai, Ligang1

Author affiliation:1 School of Mechanical Engineering and Applied Electronics Technology, Beijing University of Technology, Beijing 100124, China

Corresponding author:Zhao, Y. ()

Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery

Abbreviated source title:Nongye Jixie Xuebao

Volume:40

Issue:9

Issue date:September 2009

Publication year:2009

Pages:12-15

Language:Chinese

ISSN:10001298

CODEN:NUYCA3

Document type:Journal article (JA)

Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China

Abstract:Due to the characteristic of non-linear dynamic, time-delays, external disturbance and parameter uncertainty, the automated clutch is difficult to be controlled precisely. A sliding mode controller was introduced to control the automated clutch effectively. The sliding and global stability conditions were formulated and analyzed in terms of Lyapunov full quadratic form. The rapid control prototyping of automated clutch was built based on dSPACE. The experiment results show the controller is effective and robust to the parametric variation and external disturbance.

Number of references:8

Main heading:Controllers

Controlled terms:Automation - Clutches - Concurrent engineering - Job analysis - Number theory - Rapid prototyping - Sliding mode control

Uncontrolled terms:Automated clutch - DSPACE - External disturbances - Global stability conditions - Lyapunov full quadratic form - Non-linear dynamics - Parameter uncertainty - Parametric variation - Rapid control prototyping - Sliding mode controller

Classification code:913.6 Product Development; Concurrent Engineering - 913.1 Production Engineering - 912 Industrial Engineering and Management - 732.1 Control Equipment - 921 Mathematics - 732 Control Devices - 731 Automatic Control Principles and Applications - 723.5 Computer Applications - 602.2 Mechanical Transmissions - 731.1 Control Systems

Database:Compendex

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8.Accession number:20094512432535

Title:Design and experiment of vegetable grafting machine with double manipulators

Authors:Yang, Li1 ; Liu, Changqing2 ; Zhang, Tiezhong1

Author affiliation:1 College of Engineering, China Agricultural University, Beijing 100083, China2 College of Mechanical and Electronical Engineering, BeijingUnionUniversity, Beijing 100021, China

Corresponding author:Yang, L.

Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery

Abbreviated source title:Nongye Jixie Xuebao

Volume:40

Issue:9

Issue date:September 2009

Publication year:2009

Pages:175-181

Language:Chinese

ISSN:10001298

CODEN:NUYCA3

Document type:Journal article (JA)

Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China

Abstract:To improve the grafting rate of 2JSZ600 vegetable grafting machine and the survival ratio of vegetable seedling grafted, a high-speed vegetable grafting machine with double manipulators was developed based on the essential structure of the old machine with a set of manipulators for transporting stock and scion added and the geometrical parameter of cutting mechanism optimized. The key structural parameters were determined by mechanism analysis and experiment. The cutting effects of stock and scion were best when angular velocity of cutter was 210 r/min. The experimental results indicate that the average grafting rate of the machine is 854 seedlings per hour and the survival ratio is 93.3%, compared with the old machine, under the condition of the same grafting success rate and adaptability to seedlings. The grafting rate and the survival ratio are increased respectively 42.3% and 3.3%.

Number of references:15

Main heading:Machine design

Controlled terms:Cutting - Experiments - Grafting (chemical) - Manipulators

Uncontrolled terms:Cutting effect - Cutting mechanisms - Double manipulators - Geometrical parameters - Grafting rate - High-rate - High-speed - Mechanism analysis - Structural parameter - Survival ratio - Vegetable grafting machine - Vegetable seedlings

Classification code:815.1 Polymeric Materials - 802.2 Chemical Reactions - 731.5 Robotics - 901.3 Engineering Research - 691.1 Materials Handling Equipment - 604.1 Metal Cutting - 601 Mechanical Design - 606.2 Abrasive Devices and Processes

Database:Compendex

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9.Accession number:20094512432516

Title:Inverse design method of centrifugal pump blade based on PDE method

Authors:Zhang, Renhui1 ; Yang, Junhu1 ; Li, Rennian1

Author affiliation:1 College of Fluid Power and Control, Lanzhou University of Technology, Lanzhou 730050, China

Corresponding author:Zhang, R. ()

Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery

Abbreviated source title:Nongye Jixie Xuebao

Volume:40

Issue:9

Issue date:September 2009

Publication year:2009

Pages:81-84

Language:Chinese

ISSN:10001298

CODEN:NUYCA3

Document type:Journal article (JA)

Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China

Abstract:In order to implement the parametric optimization design of centrifugal pump blade, the partial differential equation was used to design the impeller meridian plane and the 3-D blade surface. Firstly, quartic Bezier curve was employed to design the meridian plane, and then the partial differential equation was introduced to produce the original streamline and meridian quasi-orthogonal lines. Secondly, the partial differential equation was used to generate the centrifugal pump blade surface. According to the blade streamline equation, the angular coordinates of dispersed points on pump blade boundary was calculated from the distributions of blade angle on boundary. Consequently the boundary-value of the partial differential equation was determined. The blades geometries was controlled by adjust the distribution of the blade angle along hub and shroud. The relation between the 3-D model of pump blade and the pump design parameters was built, to achieve the parametric design of pump blade. The gradient optimizing method was introduced to realize the optimization of pump blade. The calculation result of the flow field was used to renew the shape of pump blade. The calculation case shows that the presented inverse method of centrifugal pump blade is rational.