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Table of Content

    25 August 2010, Volume 21 Issue 16
    Summary of New Type Precision Transmission Design and Manufacture
    WANG Guo-Biao, LAI Yi-Nan, FAN Da-Feng, YANG Hua-Yong, WANG Shi-Long
    2010, 21(16):  1891-1897. 
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    Design of new type precision transmission and its manufacture methodology is one of the frontier directions in current foundamental scientific research. To meet national strategic needs and to find solutions for the cutting edge technology, the challenges to develop precision transmission for national economy, social and scientific development were discussed, based upon the theme of the Shuangqing Forum of NSFC. The main contents, the frontier directions and the development future of the research area in multi-media and multi-form power transmission, composite precision transmission and the new driving based on functional materials,were also addressed extensively. As well, the priority direction and suggestions of research funds for the next 5~10 years were proposed accordingly.
    Study on Geometry Theory of Variable Wall Thickness Scroll Profiles and Shape Optimization Based on Functional Theory
    WANG Li-Cun, CHEN Jin, ZHANG Xian-Meng, CHEN Guo-Jiang
    2010, 21(16):  1898-1901. 
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    Aiming at significance of the shape of scroll profiles in the machine design,the theory of variable wall thickness scroll profiles and its shape optimization methodology based on functional theory was presented. The restriction conditions for the optimization mathematic model were analyzed, including the wall thickness of scroll compressor, the maximal diameter of the moving scroll disc, the axial distance, the pitch of scroll profiles, the height of scroll disc and the revolution radius.A optimization mathematic model of variable wall thickness scroll profiles was built. And the shape optimization example of variable wall thickness scroll profiles was given. The excellent performance and favorable shape characteristics for scroll profiles are obtained.
    Adaptive Compensation of Contour Errors Based on BP Neural Networks
    LI Xiao-Li, CHEN Wei, YAN Rong
    2010, 21(16):  1902-1906. 
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    A vector modeling method of contour errors that simplified the error calculation was developed to improve the exiting methods.After that, an adaptive tuning method of parameters for cross coupling controller was presented to deal with the changing feedrate and path curvature based on BP neural network with simple three layer nerve cell. Moreover, the calculated amount of the system can be reduced effectively using exiting
    data to distribute compensation proportion. A simulation study shows that the adaptive control method presented herein can improve the contour machining precision according to the control of contour errors under conditions of changeable feedrate and path curvature. 
    A Method of Automatic Extracting Feature Point Coordinates Based on Circle Array Target
    JIA Rui-Xue, LEI Rong-Qing, LIU Ning, DONG Jing-Chao
    2010, 21(16):  1906-1910. 
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    This paper proposed a method of automatic extracting feature point coordinates for 2D circle array target in complex background environment,which was used for camera calibration.The grey-scale image was converted into a binary image, which was composed by a multitude of connection areas,using adaptive thresholding algorithm.Firstly,the connection areas were judged by area to eliminate non-target regions.Secondly, the target region was identified by its morphological characteristics, and then its contour was extracted.Thirdly, the ellipse fitting method based on least-square principle was applied to calculate the central coordinates of every circle in the calibration image.Finally,every calibration feature point was located in order to determine the position of the corresponding dot in the 7×7 rectangular array of dots.
    Study on Frictional Power Losses of Spur Gear
    CHEN Li-Feng, TUN Xiao-Ling, QIN Da-Tong, XIAO Zheng-Meng
    2010, 21(16):  1911-1915. 
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    A novel method for frictional power losses of a gear meshing was presented according to the basic theory of power and energy of the system. It was provided that the relative sliding of two disks existed during the disks rotating, frictional power losses will be caused by the frictional torque for each disk. Based on the above principle, the model for the friction power loss of the gears meshing was built. The frictional coefficient plays important role to the frictional power loss of gears and the time-varying coefficient was analyzed. Based on the system frictional power loss of the gears, the time-varying frictional power loss was calculated. The results indicate that the power loss in the double tooth meshing plays significantly role in the whole power losses. Finally, the results obtained from the new method were compared to the test results by Velex and it is shown that the model of frictional power loss is feasible.

    Parallel Mechanism Structure Optimization Design Based on Multi-objective Differential Evolution Algorithm
    LI Meng-Lei, GU Yo-Qin, ZHANG Hua-Liang, LIU Li-Qin, DU Juan, WEN Chu-Hua, LAN Guo-Sheng
    2010, 21(16):  1915-1920. 
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    Aiming at the complexity of parallel mechanism structure optimization design,a multi-objective optimization model was proposed and solved by multi-objective differential evolution algorithm.First,a multi-objective differential evolution (MODE) algorithm was proposed.In MODE,an improved quick sort algorithm was employed to build external population, and the shrink of external population was achieved based on dynamic crowding distance, and stochastic ranking was used for constraints.Then, a multi-objective optimization model for 3-TPT parallel mechanism structure was presented.The model’s objectives were the mechanism’s work space and global kinematics performance index which were evaluated by Monte-Carlo method, and the model was solved by MODE.The result shows that MODE is a useful algorithm for multi-objective problems and the multi-objective optimization model is suitable for other parallel mechanisms.
    Numerical Simulation of Heat Transfer Performance of Paraffin Thermal-Sensitive Valve 
    TUN Fu-Chao, TUN Bai-Hu, ZHANG Xiu-Hua
    2010, 21(16):  1921-1926. 
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    Making use of good drive characteristics of paraffin material, a type of thermal-sensitive valve applied in adaptive cooling system of large-scale vehicle was designed.In order to disclose the response problem of the thermal-sensitive valve to temperature change, by means of the finite difference computational method of numerical heat transfer theory, the mathematic models of two-dimension steady-state and unsteady-state temperature field of its temperature-sensing component were built, and the simulation calculations of two mathematic models were implemented using MATLAB software.The steady-state temperature field and transient state temperature fields of some typical time were acquired through simulation, and on the basis of analyzing these temperature fields, it can be known that the response of temperature-sensing component to temperature
    changes can meet the demands of adaptive cooling system of large-scale vehicle. 
    Dynamics Optimization Design of Planar 3-DOF Parallel Mechanism
    LU Kai-Jiang, SHI Dun-Beng, ZHANG Feng-Chao
    2010, 21(16):  1926-1931. 
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    The mapping of velocity and acceleration from joint space to work space was established for a planar 3-DOF parallel mechanism. The mechanism’s dynamics equation was given based on Kane’s method. Several global performance
    indicators were proposed, which were competent for representing the mechanism’s dynamics performance in the whole design space. The mechanism met to the requirements of design space through imposing geometric constraints to scale parameter of the mechanism. The optimization design of the mechanism’s scale parameter is realized and the optimal scale parameter of different performance indicators is gained based on the global dynamics performance indicators.
    Simulation Research of Parallel Hydraulic Hybrid Excavator
    ZHANG Min-Jie, WANG Qiang-Jiu, GUAN Cheng
    2010, 21(16):  1932-1936. 
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    Due to the power transmission structures of the traditional excavators, the relevant methods can not help the distribution of working points of the engine. So a hydraulic hybrid technology and its control scheme was proposed herein. The working conditions were analyzed and the structures of hydraulic hybrid excavator were introduced. A parallel hydraulic hybrid system was chosen for simulation. The load of an actual excavator was used as input of the system. The parallel hydraulic hybrid excavator
    demonstrates that it can stabilize the engine speed,increase the efficiency and optimize the drivability.
    Study on a Large-scale Scanning Three-dimensional Lens Structure of IPC-208B AFM
    LIU An-Beng, LIU Ji-Chun
    2010, 21(16):  1936-1940. 
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     A large-scale scanning three-dimensional lens structure was designed for IPC-208B AFM. The step drive system, piezoelectricity scanner and cantilever probe with a control made AFM tip accomplish three-dimensional scanning precisely. This kind of lens body has broken through the restrictions on the scanning range of the piezoelectric ceramic by swatch scanning, the scanning range has been 25mm×25mm. Experiments were carried out on mica and polyamind(PA) samples by the AFM with the designed system, and the experimental results indicate that this three-dimensional drive system can help AFM achieve nano-detection, and the detection resolution of AFM system can get 0.1nm. Furthermore, this design improves maneuverability, efficiency and reduces cost for AFM detection experiments.
    Energy Dissipation of Bolt Joint under Cycle Load and Parameter Identification of Interfaces
    TAO Yun-Ping, WANG Zhi-Yuan
    2010, 21(16):  1941-1943,1951. 
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    This paper studied the micro motion of bolt joint under cycle load, introduced a distribution parameter model, considering that the function of pressure distribution of bolt joint is a curved face integral, and the relationship between energy dissipation and magnitude of loading was idetified. Then ABAQUS simulation results were compared to the experimental ones in order to verify the correctness of this model.At last they were applied to parameter identification of the Iwan model, makeing a foundation for further study of other type interface’s model building and parameter identification.
    Design of Constant-force-elastic Mechanism
    CHEN Jian, DENG Li-Juan
    2010, 21(16):  1944-1946. 
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    The paper put forward a kind of mechanism which can output constant-force.The principal of the mechanism was that by designing the profile of the parts, the directions of normals in contact points can be controlled,which made the function relationship between the displacement and the direction of force passed via parts desirable,thus the function relationship between the displacement and the force output met the demands.Further, through an example and the related experiments,the mechanism and the design method were proved to be feasible and effective.
    Gearbox Fault Diagnosis with Rotating Speed Fluctuation Based on SVD and Chirplet Path Pursuit Algorithm
    LUO Ji-Sai, XU De-Ge, SHI Mei-Li
    2010, 21(16):  1947-1951. 
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    A method for the fault diagnosis of gearboxes with rotating speed fluctuation based on SVD and chirplet path pursuit algorithm was proposed herein.In this method, the vibration signals were decomposed into signal components by SVD method, and a reconstructed signal which was the first component with the largest value was obtained. The gear meshing frequency was estimated by processing the reconstructed signals with the chirplet path pursuit algorithm, then dividing the gear’s meshing frequency by the number of gear teeth and the gear rotational speed signals can be obtained. Finally, according to the extracted rotational speed signals,the vibration signals were resampled
    at constant angle increments, and the gearbox fault diagnosis was accomplished by the order analysis of the resampled signals. Practical application examples confirm the validity and the superiority of the proposed method.
    Kinematics Simulation of MOTOMAN-HP3 Robot Based on Virtual Reality
    ZHAN Xiao-Lei, XIN Hong-Bing, HAN Shi-·Bi-De- Lan-Te-Shi
    2010, 21(16):  1952-1954,1998. 
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    According to the structure characteristics of MOTOMAN-HP3 robot, a multilayer distributed network control system based on client/server and kinematics equations in D-H coordinates were designed. By model building using Solidworks-VRML method, combined with robot kinematics and VR toolbox, a VR control system of MOTOMAN-HP3 robot was built, and remote control was achieved finally.
    Design and Implementation on Condition-based Maintenance of Blast-furnace Top Pressure Recovery Turbine Unit
    SU Hou-Jun, SHI Tie-Lin, CHEN Fei
    2010, 21(16):  1955-1958. 
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    The paper introduced the current situation of research on CBM and fault feature of TRT. A CBM support system of blast-furnace top pressure recovery turbine unit was developed according to the condition TRT. With the reliability centered maintenance(RCM) at the core,through the important step such as condition predict,condition estimation,the risk evaluation and expert advice, the system will make the optimum maintenance decision finally.
    Research on Tensile Deformation and Strain of Composite Corrugated Skin
    DIAO Jin-Chao, WANG Bang-Feng, MAO Chang-Wei, NING Su-Juan
    2010, 21(16):  1959-1963. 
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    A corrugated composite skin has large deformation capability in transverse direction and huge bending stiffness in longitudinal direction. So it can satisfy the deformation and load requirements of the morphing wing skin.A theoretical model between the global deformation of the skin and the local strains at the wave peak and wave trough positions of the corrugation was established when the neutral layer deviated and deformed due to the tensile load.A kind of strain gauge bridge and its signal conditioning circuit were designed for measuring the deformation of the corrugated composites,and the strain measurements were corrected. The relation between the global deformation of the skin and the local strains measured by strain gauge were obtained.A corrugated composite skin was manufactured and was tested in tensile direction by testing machine. The deformation of the whole corrugated composite skin was obtained by the strain gauge according to the corrugated relationship established herein. The results from the measuring system and the deformation of the corrugated composites measured by the testing machine were compared. The comparison shows that the theoretical model and the measuring style are able to provide the global deformation of the corrugated composite skin effectively.
    A Denoising Method of Lifting Wavelet Package Gradual Changing Threshold Based on Ant Colony Optimization
    LIANG Chu-Bao, ZHANG Pei-Lin, CAO Jian-Jun, LIN Guo-Quan
    2010, 21(16):  1964-1969. 
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    In order to improve the denoising performance of denosing method of lifting wavelet package gradual changing threshold selection and quantization,a denosing method of lifting wavelet package gradual changing threshold based on ant colony optimization was put forward. The deepness first combination tree was used as lifting wavelet package decomposing tree of the same state signals. In order to optimize the characteristic separability, a gradual changing threshold optimization mathematic model was set up. All the leafage nodes’ thresholds of the deepness first combination tree were optimized synchronically. According to the characteristics of the model, an ant colony method based on moving searching window was designed to resolve the model. The searching window began with the worst feasible solution area. With the searching results of the ant colony, the searching window was moved to preferable area. The simulation demonstrates that the denoising performance of the denosing method of lifting wavelet package gradual changing threshold is improved by the denoising method of gradual changing threshold based on ant colony optimization.
    Research on Rolling Bearing’s Heathcote’s Stick-slip Model Based on Materials Compatibility
    HU Chao, LIU Zuo-Min
    2010, 21(16):  1969-1973. 
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    A new Heathcote’s stick-slip model of bearing balls was developed based on both Hertz theory and materials Young’s modulus and used to calculate the stick-slip values at contact region for different bearing materials and to analyze their stick-slip characteristics by means of the model and finite element method. The research results show that the materials compatibility has greatly affect on stick-slip characteristics of roll bearings.Furthermore, the effect of load on the stick-slip of the contact region are also very great. It is found that for the same bearings, when the load increases 10%,the major and minor axis of the contact region will increase 3% and the value of the stick-slip maximum point of contact deformation increases 6.3% due to the instantaneous axis of rotation will move up.The effects of load on stick-slip of the rolling ball bearings were investigated by using loading rate.
    A Multi-objective Optimization Method for Holo-balancing Weights of Rotor Set
    ZHANG Xi-Ning, DIAO Meng, WEN An-Rui
    2010, 21(16):  1974-1977. 
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    Experimental Investigation on High Frequency Induction Brazing of Diamond with Ni-based Brazing Filler
    XU Zheng-E, XU Hong-Jun, FU Yu-Can
    2010, 21(16):  1977-1981. 
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    An Algorithm of Solving Highlight Line Based on Arc-length Parameters
    LI Yan-Yuan, WANG Xiao-Beng, SHU Li-Jun
    2010, 21(16):  1981-1985. 
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    A new algorithm was presented herein to solve the highlight line, which was based on the arc-length parameterization.It transfers the traditional algorithm which uses surface-plane intersection to solve highlight lines, and improves the algorithm’s efficiency. In the new algorithm highlight line was obtained by numerically solving the initial-value problems for a system of first-order ordinary differential equations. Thereby, the new algorithm can be solved by ODE45 function of powerful MATLAB, which is based on adaptive 4-5-order Runge-Kutta algorithm.Finally, implementation examples
    were also given to demonstrate its effectiveness and its efficiency was analyzed.
    Bifurcation and Chaos of Forced Vibration for a Shape Memory Alloy Spring Oscillator 
    SHANG Ze-Jin, WANG Zhong-Min
    2010, 21(16):  1986-1991. 
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    The recovery force of shape memory alloy spring was described by using polynomial constitutive equation.A nonlinear dynamic model of forced vibration for the shape memory alloy spring oscillator was established. Numerical simulations were performed by a fourth-order Runge-Kutta method. The bifurcation diagram and Lyapunov-exponent spectrum were presented while the dimensionless temperature, the dimensionless damping coefficient or the dimensionless amplitude of exciting force was varied respectively, thus the bifurcation of the system was investigated. Furthermore, the periodic and chaotic motions were analyzed by means of the displacement time history diagram, the phase portrait and the Poincare section diagram with different parameters. The results show
     that the periodic or chaotic motion of the system occurred by changing temperature, damping coefficient and amplitude of exciting force, thus the vibration of the system can
     be controlled.
    Study on Wall-thickness and Deformation Regularity of Cylinder Part Based on Solid Granules Medium Forming
    DONG Guo-Jiang, DIAO Chang-Cai, CAO Miao-Yan, HAO Hai-Bin, YANG Dong-Feng
    2010, 21(16):  1992-1998. 
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    Solid granules medium sheet metal forming technology is a technology that applies solid granules medium instead of rigid punch (or elastomer,liquid) to finish the sheet metal flexible die forming. Based on the experiments and study of the performance of solid granules medium material, the experimental sheet metal forming die and device were designed and manufactured.The cylinder part was trial-produced successfully by the forming experiments as well.By the experiments, the changing law of
    wall-thickness of the cylinder part in different stages during the forming process was obtained. The shape change in the free deformation zone might be described accurately by the functional model of a circular curve. A finite element model of sheet metal forming was set up by taking the solid granules medium as a continuum medium. The comparisons

     between the results from the numerical simulation and the experiments show that the results from the numerical computation using the continuum material model are close to those from the practical testing.

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    HU Feng, XUE Ke-Min, LI Ping, WANG Gang-Chao, LI Qi
    2010, 21(16):  1999-2002. 
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    TUN Jian, Jocher Dietrich, LI Jiang
    2010, 21(16):  2002-2005,1015. 
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    SUN Dong-Shu, HU Feng-Bin, QIN Da-Tong, LIU Zhen-Jun
    2010, 21(16):  2006-2010. 
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    DIAO Wei, WANG Zhi-Yuan, ZHOU Zhi-Li
    2010, 21(16):  2010-2015. 
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