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ISSN 1674-2850
CN 11-9150/N5
 
Current Issue
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February 30,2010
Volume 3,Issue 4
Pages 320-425
Subject Area:Fluid Power and Control,Computer Aided Manufacturing,Industrial Robot Technology
 
Title: Precompensation method of CNC machining opposite clearance based on vector operation
Authors: QIN Mingming, LI Guolong
PP: 422~425
Abstract: Based on the influences of opposite clearance on computer numerical control (CNC) machining, the CNC code precompensation method of the CNC machining opposite clearance is introduced, and the precompensation process of opposite clearance is also introduced. The vector operation rules are used to research the algorithm of precompensation, and the proposed algorithm has been applied in a special numerical control (NC) equipment. Applications show that on the premise of not changing the CNC system and mechanical structure, the method can effectively achieve the compensation of opposite clearance in the CNC equipment.
Keywords: numerical control machine tool; numerical control machining; opposite clearance; vector operation; precompensation
 
Title: Analysis and countermeasure of leaking of hydraulic drive system
Authors: FU Pengfei, DAI Fei
PP: 417~421
Abstract: By analyzing the locking loop that commonly used on construction machinery, this paper illustrates the importance of airproofing in the hydraulic system, which is important to settle and control the hydraulic system leaks. By researching the sealing mechanism, it analyzes the system’s leakage form and the problem which causes leakage. It puts forward effective measure to control leaking and methods for selecting and installing seal components, in order to promote the role of hydraulic technology in the practical work.
Keywords: hydraulic drive; leaking; airproofing; countermeasure
 
Title: Research on simulation of walking mechanism of roadheader based on ADAMS
Authors: ING Jingxiu, LI Chunying, NIU Weibing
PP: 411~416
Abstract: This paper sets up a simplified 3D solid model of crawler walking mechanism in Unigraphics (UG) software, and then imports the model into ADAMS software and bear restriction and force of contact. Then forward and turning dynamics simulation is carried out and some rules are got from the result. It provides theoretical basis and the boundary loading conditions for finite element analysis, and it has certain reference for the dynamics simulation research of the crawler travelling mechinanics of other machinery.
Keywords: mechanical dynamics and vibration; ADAMS; roadheader; crawler walking mechanism; simulation
 
Title: Measurement system for voltage signal of external characteristic of arc welding power source based on virtual instruments
Authors: ZHANG Yong
PP: 406~410
Abstract: In order to recognize the external characteristic of arc welding power source more conveniently, a measurement system for the voltage signal of the external characteristic of arc welding power source based on the virtual instruments is provided. The data acquisition technology and programming with the language of LabWindows/CVI are applied to design the system whose primary hardware is PCI 1710 data acquisition card. The model of data acquisition is periodical data acquisition to store the external welding voltage into the files, and at the same time the data are shown on the screen in real time style which is convenient to investigate the change of the external signal. To testify the practicability of the data acquisition system, the test of the measurement of external welding characteristics, welding voltage, is carried on. The result shows that the system can real time sampling with little distortion factor.
Keywords: automation of welding; external characteristic of arc welding power source; measurement system; LabWindows/CVI
 
Title: The structural simulation of spiral static mixer based on FLUENT
Authors: LIU Bingcheng, HUANG Liang, LI Tingting, LI Tao
PP: 401~405
Abstract: In order to deal with the problems of mixing of produced water and pharmacy in current oil field, the mixing mechanism of spiral static mixer was analyzed. Computational fluid dynamics (CFD) software FLUENT was used in the numerical simulation of the flow field in three combinations of the mixer, and a new type of pipeline dosing mixer was developed. The medicine injecting way and blade length were optimized separately. The results show that dosing in three tube is better than dosing in wall of tube and dosing in single tube; blade length can be selected flexibly according to actual needs, which provide theory basis for the future experiment research.
Keywords: chemical process machinery; static mixer; FLUENT simulation; structural optimization
 
Title: Application of Galil motion control card in straightening machine
Authors: MEI Kai, LU Hong
PP: 396~400
Abstract: The paper introduced a method that achieved motion control in straightening machine system based on PC and motion control card. The hardware platform of motion control is composed of Yanwei YPC 810 industrial computer, motion control card of American Galil company and Japanese YASKAWA servo motors: SGMAH08A, SGMGH09A, SGMGH30A and motor server SGDM08AD. As for software programming, the paper completed the main program and the logical process framework with Labview. Galil provide some basic virtual instruments (VIs). Commands were written by programming language just like NC code, which the paper contained in Galil motion control card, into that VIs. After that, added them to the framework, then, entire program work is finished. Practice has proved that this control method which considered features both of PC and motion control card, took full use of Labview graphical programming and VIs which offered by Galil, significantly simplified the research process.
Keywords: mechanical manufacture and automation; straightening machine; motion control card; LabVIEW; process framework
 
Title: Identification of servo system and nonlinear PID controller
Authors: MAO Yuliang, ZHAN Peng
PP: 389~395
Abstract: In this paper, the servo system step response data are obtained based on experimental method, and a mathematical model of the servo system is established with the experimental data obtained by the method of parameter identification. The model test shows that the model matches up to the practical model. This method makes the servo system modeling more convenient and closer to reality system model. Having found conventional PID controller fault in the control of servo system, this paper introduces a kind of nonlinear PID controller, and the two PID controllers are respectively used to control servo system. Finally, the Matlab simulation results show that nonlinear PID controller can get fast response and small overshoot, and has a certain self adaptation. This also demonstrates that the designed nonlinear PID is superior to conventional PID controller.
Keywords: mechanical manufacture and automation; nonlinear proportion integration differentiation controller; system identification; servo system
 
Title: The control method of hourglass mode in the simulation of the lateral pressure for the submarine cable
Authors: LI Jing, WU Xianjun, WANG Yingjian
PP: 383~388
Abstract: The hourglass mode emerging from the analysis of the lateral pressure for the submarine cable makes effect on the accuracy of the simulation results. The paper adopts different hourglass control modes to find out the reasons for the formation of the hourglass and focuses on the methods to distinguish the parts which have serious hourglass mode and to control hourglass. Firstly this paper finds out which components have the serious hourglass mode. Then several control methods of the hourglass mode are studied and compared by adjusting the different hourglass control coefficient, the most effective control method is concluded and a more accurate result is got.
Keywords: mechanical manufacture and automation; effective control method; hourglass control coefficient; hourglass mode
 
Title: 3D modeling and dynamic loading simulation analysis and research of the planet wheel gear deceleration box used in nuclear power station
Authors: NI Shoudong, YUAN Zuqiang, WANG Teng
PP: 377~382
Abstract: The paper used computer simulation for the research and development of the new product system, carried on sufficient pre technical design and analysis, used Pro/E software to establish the 3D model and assembly, dynamic motion imitation, and used the Mechanica module belonging to Pro/E to carry on the FEM analysis. SimulationX software has been used for the vibration analysis. The pre-simulation research and analysis have played a key role in the successful design and manufacturing of the whole new system.
Keywords: computer aided manufacturing; planet wheel deceleration box; Pro/E software; SimulationX software; finite
 
Title: The research of STL files visualization based on OpenGL
Authors: HU Haiou, WANG Su
PP: 371~376
Abstract: This paper firstly analyses STL files,chooses a laconic structure and uses OpenGL strong functions to research STL files on the platform of Visual C++ 6.0. After a STL data model is read, OpenGL can easily render model, transform visual angle, zoom display sizes and so on. With using fscanf function of C language, the method gets better effect and has the practicality value. Then, this paper develops the software based on STL files. It will be benefit to post processing and sustain software secondary development powerfully. Lastly, this paper designs experimental test with a lot of STL files and gains anticipative aim.
Keywords: computer aided manufacturing; open graphic library; STL files; visualization
 
Title: 3D design system for the reducer of hoister based on calculation
Authors: LI Qiang
PP: 367~370
Abstract: A 3D design system developed from SolidWorks is introduced. In this system, the optimum design, 3D model building, outputting drawing and finite element analysis are concentrated. The design efficiency is increased, the quality of product is assured, and the working force is reduced. Calculating module can carry out fuzzification optimum design by the power, input rotational speed and total velocity ratio of the reducer. Then the optimum scheme is found by once. The 3D modeling module takes the corresponding modeling and driving ways to the different parts and assembly, making the full advantage of parameterization modeling of SolidWorks. And the corresponding schedule drawing is built.
Keywords: computer aided design; SolidWorks; second development; 3D model building; optimum design
 
Title: Study on path planning based on genetic algorithm for minimizing attitude disturbance
Authors: DUAN Xiao, JIA Qingxuan, SUN Hanxu, CHEN Gang
PP: 361~366
Abstract: Genetic algorithm (GA) is a high parallel, random and adaptive global optimization algorithm, which is inspired from the mechanism of nature selection and evolution. In this paper, a path planning method based on GA is presented. Firstly, the model of the space robot is built to display the mapping of the end velocity and the joint velocity. Then the optimal algorithm based on genetic algorithm is presented to search the optimal solution which minimizes the disturbance of base attitude in the feasible solution space. Finally, an illustrative example is used to verify the feasibility of the algorithm.
Keywords: mechanical design; space robot; attitude disturbance; genetic algorithm; path planning
 
Title: Modeling and dynamic simulation of gear box virtual prototype based on Pro/E and ADAMS
Authors: REN Chao, HU Youan
PP: 355~360
Abstract: Based on Pro/E, a 3D modeling and designing software, this paper established a parametric model of a gear box of the rack and pinion drive mechanism, which was used in large gantry milling machine XK2425 600. The data interface module MECHANISM/Pro was used to convert the Pro/E model data to ADAMS, then the virtual prototype was built in it. The rotational speeds, meshing forces, and reactive loads at bearings were obtained by dynamic simulation of the virtual prototype, which can be used in finite element analysis as boundary condition, helped to calculate the strength and stiffness of the box.
Keywords: mechanical design; gear transmission; virtual prototype; dynamic simulation
 
Title: Toughening mechanism of Al2O3/Cr3C2/(W, Ti)C composite ceramics
Authors: GAO Ying, ZHANG Qinhe, HU Baolin, ZHANG Bo
PP: 350~354
Abstract: The hardness, fracture toughness and bending strength of composite ceramics, which are derived by mixing Cr3C2 and (W, Ti)C into Al2O3 matrix and obtaining Al2O3/Cr3C2/(W, Ti)C composite ceramics having different components, are tested and analyzed. The results show that composite ceramics are superior to pure Al2O3 ceramics in bending strengthen and fracture toughness. The main reason for the crack of Al2O3/Cr3C2/(W, Ti)C composite ceramics is found to be the mismatch of thermal expansion factor by performing stress calculation. Three toughening mechanisms are used to analyze the crack propagation.
Keywords: mechanical design; inorganic ceramics material; composite ceramics; toughening mechanism; Al2O3/Cr3C2/(W, Ti)C
 
Title: Behavior control model of nonholonomic tunneling systems
Authors: YANG Xia, SHAO Cheng
PP: 344~349
Abstract: This paper researched some of the main technology about the behavior control modeling system of the shield machine. The main task of modeling was researched after the actuality of tunnel excavation was discussed. In this paper, shield propulsion systems were studied, and its underactuated and nonholonomic features were proved at first. Second, the influencing factors of shield behavior were provided by the numbers, the load model acting on shield and kinematics and dynamics equations were established respectively, and then the corresponding simulation analysis (including the impact of pedoturbation on shield position and posture and the simulation analysis of its comparison) was carried out.The model can provide reference for the improving of automatic control of shield behavior.
Keywords: mechatronics; shield machine; nonholonomic; kinematics; dynamics; behavior control
 
Title: Experimental study on driving circuit of decoupled vibratory feeder
Authors: WANG Keyi, TIAN Mengqian, HAN Liang
PP: 338~343
Abstract: Vibratory feeder is a highly effective device, widely used in automatic manufacturing and assembling system. This paper describes the basic working principles of the vibratory feeder. Based on the work above, the driving circuit of decoupled vibratory feeder has been presented and the related experimental platform has been set up. Experiments have been carried out to measure the conveying speed of parts, and experimental results match well with the simulation ones, which provide an important basis for commercialization of the decoupled vibratory feeder.
Keywords: mechatronics; decoupled; vibratory feeder; driving circuit
 
Title: Dynamic analysis of industrial robot using Lie groups
Authors: LIU Boyu, GAI Yuxian
PP: 332~337
Abstract: Lie groups are used to describe the six DOF dynamic equation. Explicit connection between the equation of motion and the concept from Lie theory is established. With the advantages of Lie groups, the acquisition of the robot dynamic equation is easier. Firstly, the transformation is described by exponential map, which can also describe position and pose of the robot. The adjoint representation of Lie groups and Lie algebra is used to describe generalized velocity and acceleration. The final dynamic equation is obtained in recursive form. Then Matlab program is developed to solve the dynamic equation, when working torque is loaded on the wrist, the driving moment dynamic characteristics of each joint is obtained. At last, by MSC ADAMS emulating the robot model, the results of ADAMS coincide with that of Lie groups method. So, Lie groups method in robot dynamics is effective, especially in complex situation.
Keywords: mechatronics; Lie groups; robot; dynamics; simulation
 
Title: Effect of bonding pressure on wire bonding transducer system
Authors: LI Zhanhui, WU Yunxin, LONG Zhili
PP: 326~331
Abstract: A model of wire bonding transducer system is established using equivalent circuit method. The wire bonding transducer system is tested at different bonding pressures with impedance analyzer. The admittance circle diagrams of wire bonding transducer system are obtained at different bonding pressures. And the change rules of resonance frequency, anti-resonance frequency, mechanical quality factor, dynamic resistance and electromechanical coupling coefficient etc are gotten. This explains the best bonding pressure selection from vibration principle. It is proved that equivalent circuit method is valid in thermosonic wire bonding transducer system.
Keywords: mechatronics; wire bonding; bonding pressure; admittance circle; equivalent circuit
 
Title: Review of blood rheology and integrated surface texture of artificial liver
Authors: XIE Yijing, WANG Jiugen
PP: 320~325
Abstract: The state of the art of artificial liver system was reviewed in three aspects, namely blood rheology, surface texture and interface dynamics, and the problems to be studied in the future were proposed. The interaction between the fiber surface and blood would be studied in terms of tribology, and the effects of Van der Waals force, capillary force and electrostatic force during the blood flow process on cell flow and adhesion time would be analyzed. The molecular blood rheology would be studied with consideration of wall elastic viscous deformation and the non Newtonian rheological performance. The bionic integrated surface texture and active design of the texture would be examined to optimize the textures and interface dynamics.
Keywords: rheology; blood; review; integrated surface texture; interface dynamics