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    25 July 2008, Volume 19 Issue 14
    A Multi-response Robust Design Method Based on TOPSIS
    Zhong Yuning,;Bao Lei[KG〗Wen Changjun
    2008, 19(14):  0-1641. 
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    A new multiresponse robust design method was put forward on the basis of the combination of Taguchi signaltonoise function and technique for order preference by similarity to ideal solution(TOPSIS) method.The drawback of the comprehensive signal-to-noise method which weighed each characteristic equally was modified,and the application of TOPSIS method was extended to meet all of the three types of quality characteristics.A typical case study with the above hybrid strategy is showed that the new method is more effective.

    Application of Intelligent Predictive Control in CVT Speed Ratio Control 
    Liu Jingang;Zhou Yunshan;Gao Shuai;Zou Naiwei
    2008, 19(14):  0-1763. 
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    The continuously variable transmission(CVT) speed ratio system
    was described with a nonlinear characteristics with pure time-delay by analyzing its basic control principle.The characteristics of time-delay were the basic reason that induced speed ratio tracking fluctuation when the common-used control algorithm was applied in this system.Aiming at this problem,an intelligent predictive controller(IPC) was designed according to the requirements of CVT speed ratio control.The proposed controller utilized the support vector machine(SVM) predictive model to forecast the future control effect; the introduction to this SVM predictive model improves the forecasting precision for its nonlinear behaviors.The optimal control was determined by using a simple chaos optimal algorithm(COA);the introduction to the chaos optimal algorithm improves the optimal control searching efficiency effectively and solves the problem of real-time performance in control process.It is shown from the bench test that the proposed control algorithm accomplishes the better steady and dynamic performances than those of general PID:the fluctuation reduces in static tracking;the overshoot and the transition time decrease obviously in step-response.

    Modeling Method and Technology to Product Family Design of
    NC Spiral Bevel and Hypoid Gear Generator
    Xin Zhijie,;Zhang Dawei;Chen Yongliang;Man Jia
    2008, 19(14):  0-1641. 
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    Taking the case of product family design of NC spiral bevel and hypoid gear generator,design method and course were analysed around fundamental principles of product family design.Some methods and technologies were presented to all design modeling in the course of product family design including requirement modeling,function modeling,and structure modeling using the thought of design region in axiomatical design theory.

    A Study of Working-gesture Stability of Electromagnet for Electromagnetic Brake of Tractor-semitrailer
    Xu Xing;Chen Zhaozhang;Li Zhongxing
    2008, 19(14):  0-1763. 
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    In order to improve the working-gesture stability of the electromagnet,the working gesture was analyzed based on the brake mechanism and mechanical theory when the electromagnet was working and the unsymmetrical quasi-elliptic structure was proposed.As the magnetic circuit of the electromagnet was more complex,the electromagnetic field analysis software of Maxwell-3D was for checking computations.Research and testing results show that the unsymmetrical structure can be used to solve the serious overturn and revolving tendency of the electromagnet,thus enhances the braking performance of the electromagnetic brake,at the same time achieves the even wearing and extends its life.

    Error Modeling and Sensitivity Analysis of a Novel Parallel Mechanism
    Yang Qiang;Sun Zhili;Yan Ming;Zhou Peng
    2008, 19(14):  0-1641. 
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    Applying homogeneous transformation,inverse kinematics of a novel 5-DOF mechanism of independent translational and rotational movements was deduced.Based on inverse kinematics and the first order Taylor approach,error model considering original errors from kinematics parameters,clearance errors of revolving joint and driving errors was presented. From the model,functional relationship between kinematics reliability of tool tip and every error resources was got;the contribution of each error component to the kinematics accuracy of the mechanism was analyzed and the key of all error resources was confirmed.Applying difference method,sensitivity analysis of main influencing parameters on position errors of tool tip was taken,and main design variables can be determined according to different parameter sensitivities.Error modeling and sensitivity analysis provides theoretical foundation for optimum design and error compensation of the robotic mechanism.

    Research on Take-off Posture Optimization for Hopping Robot
    Xu Zhaohong;Lü Tiansheng;Wang Xuyang;Liu Jie
    2008, 19(14):  0-1763. 
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    Based on floated-basis space,variable constraint dynamics equation of jumping robot was found.Hopping robots can be regarded as a redundant manipulator with a load held at the end-effector.This paper optimized take-off posture of hopping robot by applying inertia matching ellipsoid and directional manipulability.Numerical simulations and trials show inertia matching ellipsoid corresponds to the robot’s hopping height.Inertia matching ellipsoid is a valid method to posture optimization for take-off motion.

    Fluid Field Simulation of Electrochemical Machining Cavities Based on Software of CFD 
    Wu Rui;Xu Jiawen;Zhao Jianshe
    2008, 19(14):  0-1668. 
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    In order to solve the difficulty with cathode and fluid field design in electrochemical machining cavities,a general applicable method for the simulation of fluid field state during electrochemical machining(ECM) processes was applied,based on the characteristics of electrochemical machining processes and the software of computational fluid dynamics(CFD).The results of this simulation similar to the actual experimental results are obtained.The simulation enables to achieve efficiency and low cost design of cathode,hence reducing a lot of “trial and error” cycles.

    Nonlinear Analysis of Frictional Chatter Mechanism in Mechanical Systems
    Huang Yi;Wang Taiyong;Zhang Ying;Jiang Yongxiang
    2008, 19(14):  0-1763. 
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    Chatter induced by dry-friction of a typical 2-DOF block-on-belt
    model was studied.The stability of the system equilibrium point was analyzed.The analytical solution under pure-slip condition was obtained using the average methods.The nonlinear dynamic behaviors of the system were numerically and analytically investigated.The mechanism of frictional chatter was discussed.The results show that with the decrease of
    belt velocity the system loses its equilibrium stability and the chatter,containing pure-slip and stick-slip types, are induced.

    Study on Processing Performance of CNC Spiral Bevel Gear Grinding Machine 
    Wang Zhiyong;Zeng Tao
    2008, 19(14):  0-1668. 
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    By applying SPC technology, the experimental study on processing performance of homemade YK2050 CNC spiral bevel gear grinding machine was done.The machine tool’s stability was analyzed by control chart and the process capability indices were calculated according to the experimental data.The outcome of the study indicates that the grinding machine has good processing stability and enough process capability.Furthermore,the general reason of processing performance abnormity was analyzed and the solution was provided.

    Design and Experiment of the Silicon Micro Electrostatic Resonators with Multi-folded-beam Suspensions
    Zhao Jiangming,;Yang Jiewei;Sun Junjie;Wu Xiaoling;Chen Xiaoyang
    2008, 19(14):  0-1763. 
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    A transverse oscillating model of the micro electrostatic resonators with multi-folded-beam suspensions was built up. The deformation expressions of the multi-folded-beam suspensions and those of the resonance frequencies were derived. The ANSYS oscillating mode simulations were made for the four types of resonators with two kinds of multi-folded-beam suspensions fabricated by standard silicon bulk micromachining process. According to the experimental results, relative errors between the calculated results and the ANSYS simulation results are both less than 2 percents. It can be found that easily transfer from electrostatic energy to micro mechanical energy can be made with larger oscillating amplitudes by lower frequencies.

    机械科学
    Research on High Efficiency Slicing of EDM and ECM on Solar Wafer Slicing
    Liu Zhidong;Wang Wei;Tian Zongjun;Qiu Mingbo;Huang Yinhui
    2008, 19(14):  0-1668. 
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    太阳能硅片;电火花电解;高效切割;复合工作液
    Structural Multi-objective Optimization Design of Air-suspending Frictionless Pneumatic Cylinders
    Lu Bo;Tao Guoliang;Liu Hao;Xiang Zhong
    2008, 19(14):  0-1763. 
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    The mathematical models of gas pressure distribution in the clearance,gas leakage and radial load capacity were established using a compressible fluid model,and an optimization design method using nondominated sorting genetic algorithm-II(NSGA-II) was put forward to optimize the structural parameters of air-suspending frictionless cylinders which were used in the suspension system for modal test.Structural parameters were set as optimization variables;gas leakage and radial load capacity were optimization objections;and complicated nonlinear equations of gas flow were transferred to constraints.The method using NSGA-II can achieve a uniform Pareto optimal set in objective space,and decision maker can master and select the optimal values of the piston’s structural parameters.The results show that the optimized cylinder can reduce friction and gas leakage effectively which verifies the validity of the proposed method.

    Energy Efficiency Analysis and Evaluation for the Pump Fluid System 
    Dong Yong;Yan Guojun;Lu Zhaoda
    2008, 19(14):  0-1668. 
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    This paper used engineering attributes to deal with the energy analysis,provided a new concept “energy transport consumption per unit volume(i.e. energy consumption coefficient” as a new energy efficiency measure.Based on this new concept,a mathematic model of related design and operation method was constructed to analyze the design of system optimization.

    Research on Damage Diagnosis Agent Based on Acoustic Emission Technology
    Zhao Xia;Yuan Shenfang;Zhou Hengbao;Sun Hongbing
    2008, 19(14):  0-1763. 
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    To solve the problem faced when monitoring the large practical structures,a multi-Agent system for monitoring the large aluminium plate was developed.
    The whole system can choose strain gauge sensor,the fiber sensor and PZT sensor automatically,self-organize the sensor network and realize the typical three monitoring instances including the localization of acoustic emission source,bolt loosing and strain distribution monitoring.As one of the basis work for the implementation of the whole system,the process of developing the damage diagnosis Agent based on acoustic emission was introduced in detail.Through the detailed experiments,based on the acoustic emission technology,integrated with different time delay of arrival methods,the damage diagnosis Agent
    was realized for the aluminum plate,glass fiber-epoxy composite plate and the carbon fiber reinforced plate.The work herein is the foundation of the implementation of the whole multi-Agent system for the large structure health monitoring.

    Research on Polychromatic Sets-based Assembley Sequence Generation Method 
    Zhao Shanshan;Li Zongbin
    2008, 19(14):  0-1668. 
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    With the increasing of the number of parts in assembly sequences generation methods based on logic reasoning,it will result in sequence combinatorial explosion.To deal with this problem,a novel sequence reasoning method combined AND-OR graph with polychromatic sets theory was presented.In this research,a novel formalization assembly model was given.Based on AND-OR graph with assembly relations,an assembly-constraint-relation matrix was constructed and a constraint-relation-logic equation was presented,which formalized the assembly conditions as location-relation-logic equation,hindrance-disassembly-relation-logic equation,junction- relation-logic equation and process constraint logic equation.In the end,a case of speed reducer was showed to demonstrate the effectivity of this method.The result shows the method can exclude the unreasonable assembly sequences in advance,reduces the solution set and decrease the computation complexity.

    Research on Improving the Machining Accuracy of Micro-ECM by Nanosecond Pulse Current
    Zhang Zhaoyang;Zhu Di
    2008, 19(14):  0-1763. 
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    According to the transient process of electrochemical reactions,the mechanism of that ultra-short pulse current can improve the machining accuracy of ECM was investigated.And the theoretical model of ECM transient process was developed based on the Faraday’law and Butler-Volmer equation.The theoretical analysis was verified with the subsequent machining experiments.Using the application of nanosecond
    pulse current,the micro-hole with 20μm in diameter is machined in the micro-ECM experimental system.

    Service Matching Model and Algorithm Design in e-HUB System
    Yuan Qingni,;Xie Qingsheng;Xu Mingheng;Zhou Guixian,
    2008, 19(14):  0-1668. 
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    In e-HUB system, the service module matches the ability of the
    engineering service providers to customer needs.The result of the matching is foundation of the collaborative relationship in e-HUB system. In order to realize the service accurate localization,and considering the public service platform characteristics of the e-HUB system,this paper proposed service match model of e-HUB system based on the Web,and designed the Web service description language and the corresponding match algorithm.Then,similarity functions were introduced to rank Web services in Relaxed match.It had analyzed semantics similarity computation of the service match.Finally,the model and service matching algorithm were used in e-HUB system.

    Testing Research for Control Loading System of Flight Simulator
    Wang Hui[KG]Xu Shoulin;Feng Yingjin;Wang Liwen
    2008, 19(14):  0-1763. 
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    This paper was based upon the development of flight simulator
    control loading system prototype as research platform,and the tests of hydraulic control system of imposing loading drive facility were carried out.In order to solve the contraction between steady state accuracy and stability,improve loading precision of the control loading system,this paper put forward a composite control algorithm which was the combination of feed forward compensation and PID feedback regulation.Test results have verified the validity of composite control algorithm,at the same time verified that the composite control algorithm is an effective method of achieving high precision tracking control manipulated by loading.

    A Genetic Local Search Algorithm for Solving Job-shop Scheduling Problems
    Zhu Chuanjun,;Zhang Chaoyong;Guan Zailin;Liu Qiong
    2008, 19(14):  0-1668. 
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    This paper presented a genetic local search algorithm for job-shop scheduling problem.The chromosome representation of the problem was based on the operation-based representation.In order to reduce the search space,schedules
    were constructed using a procedure that generated active schedules.After a schedule was obtained,a local search heuristic based on N6 neighborhood structure was applied to improve the solution.In order to avoid premature convergence of the conventional GA,an improved precedence operation crossover(IPOX) and approach of the generation alteration model were proposed for the GA.The approach was tested on a set of standard instances taken from the literature.The computation results validate the effectiveness of the proposed algorithm.

    Power Flow Transmission Characteristics of the Structure Sound in Gearbox-like System 
    Zhang Weibo;Liu Hui;Li Fanbing;Song Xianchun
    2008, 19(14):  0-1668. 
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    A new mobility matrix formula for the gearbox-like system based on the subsystems was established which contained gear shaft of the compliant source-bearing of the multi-dimensional path-gearbox wall of the compliant energy receiver,and the power flow transmission model was obtained.The force/moment multi-dimensional exciting as the source and compliant and multi-dimensional coupling as the power flow transmission path were considered sufficiently in the model development.By the mobility matrix formula developed the power flow transmission path and the coupling between the paths was studied.The power flow by the wall transverse vibration and influence from connecting path’s rigidity were analyzed quantitatively.So with this model how the subsystem’s parameters affect the whole system’s power flow characteristics can be investigated conveniently.

    A Method to Suppress Cross-terms of Wigner-Ville Distribution and 
    Its Application in Fault Diagnosis
    Cheng Fabin;Tang Baoping;Liu Wenyi
    2008, 19(14):  0-1763. 
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    The principles and characteristic frequency of typical faults of rolling bearings were analyzed,and a new fault diagnosis method to suppress cross-terms of WVD using adaptive short-time Fourier transform (ASTFT) spectrum was put forward. Firstly, the signal ASTFT spectrum which can determine the signal component positions in the time-frequency plane was obtained. Then, window function, ASTFT spectrum, was selected to process the signal WVD. Thus the cross-term interference can be effectively restrained. The simulation results show that a better resolution and more effective suppression of cross-term interference can be obtained. At last, the proposed method is applied to the fault diagnosis of bearing, the experimental results show the proposed method is effective in feature extraction. 

    Jacobian Analysis of Symmetrical 5-DOF 3R2T Parallel Mechanisms
    Li Qinchuan;Chen Qiaohong;Hu Xudong;Wu Chuanyu
    2008, 19(14):  0-1668. 
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    A method for Jacobian analysis of 5-DOF 3R2T parallel mechanism was proposed.Firstly,the structural constraints and mobility property of 3R2T parallel mechanism were briefly reviewed.Then,the Jacobian matrix of single limb kinematic chain
    was obtained by screw theory,which was a 6×5 non-square matrix.On the basis of the mobility property,it can be proven that the sixth row of the limb Jacobian matrix was redundant.Deleting the sixth row of the limb Jacobian matrix leads to a 5×5 matrix,which was of full rank in non-singular configurations.After the actuation of the 3R2T parallel mechanism was determined,the Jacobian matrix of the whole mechanism can be established with a series of manipulation of the new 5×5 matrix.

    Application of Hybrid Approach Based on Immune Algorithm and 
    Support Vector Machine for Fault Diagnosis of Hydraulic Pump
    Niu Huifeng;Jiang Wanlu
    2008, 19(14):  0-1763. 
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    A hybrid fault diagnosis approach was proposed,combining the RNS(real-valued negative selection) algorithm and the support vector machine,because it was very difficult to gain the fault samples in the fault diagnosis process of hydraulic pump.In this method,the RNS algorithm was used to generate the nonself set as the fault samples,which were used as input to SVM algorithm for training purpose.The problem,lacking the fault samples,was solved using this new method.It was accomplished to cancel the interference existing in the measured signals of hydraulic pump and pick up its features using the wavelet analysis method.At last,the hydraulic pump fault samples were tested using the hybrid approach.The classification right rate of this method is 90%,so it is valid to the fault diagnosis of hydraulic pump.

    Study on Growth Behavior of Fatigue Crack of PD3 and U71Mn Rail
    Zhong Wen;Zhao Xueqin;Wang Wenjian;Liu Qiyue
    2008, 19(14):  0-1668. 
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    An analysis of the chemical composition, mechanical performance and microscopic profile was performed on PD3 and U71Mn rail samples with oblique cracks taken from Guangzhou-Shenzhen railway.The results indicate that the strength characteristics of PD3 rail is superior to U71Mn rail.The crack propagation angle of U71Mn rail is smaller than that of PD3 rail.A mixture of intergranular and transgranular fracture was found dominant in the process of fatigue crack propagation of U71Mn rail;in comparison,the dominant fracture mode of PD3 rail is transgranular and the crack is easier to propagate at a relatively higher rate.The analysis shows that U71Mn rail is more suitable for the high-speed railway.

    Thermal-mechanical Coupling Simulation on Mini-stretch Reducing Rolling Process by FEM
    Yu Hui;Du Fengshan;Zang Xinliang;Wang Feixue;Xu Hailiang
    2008, 19(14):  0-1763. 
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    Based on rolling technology of mini-stretch reducing mill group,a 3D thermal-mechanical coupled analytic model for tube tandem rolling process had been established by using large deformed elastic-plastic finite element method.The distributional regularities of temperature field,stress field and strain filed were
    obtained by numerical simulation and actual technical process.The tube wall thickness distribution and the energy parameters were analyzed on the basis of simulation results.Simulated energy parameters are a good agreement with the measured results.The effectivity of model is verified.This model provides a powerful off-line method for analyzing industrial technology of stretch reducing rolling process.

    Tension Thickness Adjustment Efficiency in Aluminum Foil Rolling
    Zhang Hongchang;Xi Anmin;Liu Hongfei;Yang Donghong
    2008, 19(14):  0-1668. 
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    Using the elastic-plastic FEM,the aluminum foil rolling with tension had been simulated and analyzed with the nonlinear FEM software:MSC.Marc.The model of tension’s thickness adjustment had been gained.Then the influence of friction on it had been also analyzed.The results provide a control model to tension AGC in aluminum foil rolling.

    Design Method for Mesh Based Drawing Die Face
    Wang Wei;Shi Fazhong
    2008, 19(14):  0-1763. 
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    The paper presented a method of obtaining drawing part’s mesh model by constructing addendum’s mesh based on that of the product part,and then unifying the two as a whole.The final mesh can be utilized by FEM analysis.The mesh generating algorithm,different from the traditional way,where it doesnot need the
    addendum’s geometric datum,avoids the problems usually happen when trying to import CAD datum into CAE module.The seamless combination of die face design function and CAE analysis is thus attained.A case was given to testify the algorithm’s effectiveness.

    Study on Virtual Testing System of Railway Vehicle Comfort
    Yang Yue;Yang Yanzhi;Peng Bo
    2008, 19(14):  0-1668. 
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    The comfort of railway vehicles can be evaluated early in design stage by building up a virtual testing system for railway vehicles, and the vehicle design can be optimized.According to the various comfort evaluation standards of railway vehicle,the architecture scheme of the virtual testing system for railway vehicle comfort was put forward,and the virtual prototype model,virtual testing scene model and virtual reality model of railway vehicles were constructed on top of virtual prototype and virtual reality technology.Furthermore,some virtual gauges were devised by virtual instrument technology in order to visualize comfort testing data of railway vehicles.The developed system can test and analyze comfort of railway vehicles under different working conditions.

    Research on Multidisciplinary Design Optimization of Vehicle Body

    Crashworthiness and Noise,Vibration and Harshness
    Zhang Yong;Li Guangyao;Sun Guangyong
    2008, 19(14):  0-1763. 
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    Sampling points were obtained by using Latin hypercube design of experimental method.In order to improve computing efficiency,a response surface
    method was employed to construct highly nonlinear crash and torsion mode functions.
    Response surface approximate functions were optimized by using multidisciplinary design feasible(MDF) and sequential response surface methods were adopted to avoid much of computing time consume in the traditional optimization method and slow convergence or no convergence in the non- linear impact and NVH systems.It improves first torsion mode frequency of the Body-In-White(BIW) vehicle and safety,comfort and smooth performance of the full vehicle in meeting the requirements of regulation CMVDR294.