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Effects of Machine Tool Configuration on Its Dynamics Based on Orthogonal Experiment Method

Chinese Journal of Aeronautics 2012年第2期25卷 285-291页

作者： gao xiangsheng ZHANG Yidu ZHANG Hongwei WU Qiong State Key Laboratory of Virtual Reality Technology and Systems Beihang University Beijing 100191 China School of Mechanical Engineering Beijing Institute of Petrochemical Technology Beijing 102617 China

In order to analyze the influence of configuration parameters on dynamic characteristics of machine tools in the working space, the configuration parameters have been suggested based on the orthogonal experiment method. Dynamic analysis of a milling machine, which is newly designed for producing turbine blades, has been conducted by utilizing the modal synthesis method. The finite element model is verified and updated by experimental modal analysis （EMA） of the machine tool. The result gained by modal synthesis method is compared with whole-model finite element method （FEM） result as well. According to the orthogonal experiment method, four configuration parameters of machine tool are considered as four factors for dynamic characteristics. The influence of configuration parameters on the first three natural frequencies is obtained by range analysis. It is pointed out that configuration parameter is the most important factor affecting the fundamental frequency of machine tools, and configuration parameter has less effect on lower-order modes of the system than others. The combination of configuration parameters which makes the fundamental frequency reach the maximum value is provided. Through demonstration, the conclusion can be drawn that the influence of configuration parameters on the natural frequencies of machine tools can be analyzed explicitly by the orthogonal experiment method, which offers a new method for estimating the dynamic characteristics of machine tools.

关键词： configuration parameter dynamic characteristics modal synthesis method substructure orthogonal experiment method

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Research and experimental analysis of precision degradation method based on the ball screw mechanism

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High Technology Letters 2023年第3期29卷 247-256页

作者：孔德顺 gao xiangsheng JIANG Huizeng Institute of Standard Metrology China Academy of Railway Sciences Corporation LimitedBeijing 100081P.R.China Beijing Huaheng Technology Co.Ltd. Beijing 100081P.R.China Key Laboratory of Advanced Manufacturing Technology Beijing University of TechnologyBeijing 100124P.R.China Hebei Changxiang Rubber Plastic Technology Co.Ltd. Hengshui 053500P.R.China

As a key transmission component in computer numerical control(CNC) machine tools,the ball screw mechanism(BSM) is usually investigated under working load conditions. Its accuracy degradation process is relatively long,which is not conducive to the design and development of new products. In this paper,the normal wear depth of the BSM nut raceway is calculated under the variable speed operation condition using the fractal wear analysis method and the BSM’s accelerated degradation proportional wear model. Parameters of the acceleration degradation model of the double-nut preloaded ball screw pair are calculated based on the physical simulation results. The accelerated degradation test platform of the BSM is designed and manufactured to calculate the raceway wear model when the lubrication condition is broken under the variable-speed inertial load and the boundary lubrication condition under the uniform speed state. Three load forces and two samples are selected for the accelerated degradation test of the BSM. The measured friction torque of the BSM is employed as the evaluation index of the accuracy degradation test. In addition,the life cycle of the accuracy retention is accurately calculated by employing the parameters of the physical simulation model of the BSM. The calculations mentioned above can be used to estimate BSM’s accuracy performance degradation law under normal operating conditions. The application of the proposed model provides a new research method for researching the precision retention of the BSM.

关键词： ball screw mechanism(BSM) fractal theory wear model accelerated degradation method friction torque precision retention

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Modeling approach for axial contact stiffness of ball screws

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High Technology Letters 2018年第1期24卷 46-52页

作者：孔德顺 Wang Min Liu Xuebin gao xiangsheng Beijing Key Laboratory of Advanced Manufacturing Technology College of Mechanical Engineering and Applied Electronics Technology Beijing University of Technology Beijing 100124 P. R. China Institute of Standavd Metrology Chinese Acadmy of Railway Sciences Beijing 100081 P. R. China Beijing Key Laboratory of Electrical Discharge Machining Technology Beiiing 100191 P. R. China

Axial stiffness of ball screws has great effects on accuracy of positioning,dynamic characteristic and transmission efficiency. Axial contact stiffness modeling of ball screws is the key problem in dynamic analysis of ball screws. Aiming at obtaining axial stiffness of ball screws considering microscopic fractal characteristics of contact surfaces,a new analytical method is proposed to estimate axial contact stiffness of ball screws and combine the minimum excess principle with Mandelbort( MB)fractal theory in this research. The minimum excess principle is employed to conduct normal stress analysis. And the Mandelbort fractal theory is adopted to obtain contact stiffness in ball screws. The effectiveness of the proposed method is validated by the self-designed experiment. The comparison between theoretical results and experimental results demonstrates that axial contact stiffness of ball screws could be obtained by the proposed method.

关键词： fractal theory axial contact stiffness ball screw contact stress minimum excess

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Research and experimental analysis on precision degradation of BSM at low speed(I): theory analysis

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High Technology Letters 2024年第4期30卷 356-369页

作者： KONG Deshun gao xiangsheng LI Shilin LV Linbao Institute of Standard Metrology China Academy of Railway Sciences Corporation LimitedBeijing 100081P.R.China Beijing Huaheng Technology Co.Ltd. Beijing 100081P.R.China Key Laboratory of Advanced Manufacturing Technology Beijing University of TechnologyBeijing 100124P.R.China Postgraduate Department China Academy of Railway SciencesBeijing 100081P.R.China

In the structure of double-nut ball-screw mechanism(BSM),the contact angle of the ball-screw determines the relative positional relationship between the balls and the screw as well as the *** contact angle is related to geometrical parameters of the ball,the screw and the nut,which are also affected by the running status and the preload of the *** the effect of the gy-roscopic moment on the ball in the raceway,the dynamic model of the ball in space is established under different speeds and different preloads of the *** simulation of the dynamic model of the ball in space,the changing regularity of the contact angle,the helix angle,the drag torque and the mechanical efficiency of the BSM can be obtained under different speeds and different *** results show that there is a nonlinear gradient relationship between contact angle,helix angle,the drag torque,the mechanical efficiency and the speeds of the ball-screw under different *** contact angle is the key factor to affect the drag torque of the *** the analysis,it is found that establishing the ball dynamic model in space can better study the precision degradation law of the ball screw.

关键词： ball-screw mechanism(BSM) contact angle sliding friction drag torque dy-namics model precision degradation

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Initial residual stress experiment and simulation of thin-walled parts for layer removal method

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High Technology Letters 2018年第1期24卷 75-81页

作者：刘宇男 Wang Min Zan Tao gao xiangsheng Zhang Yanlin Beijing Key Laboratory of Advanced Manufacturing Technology College of Mechanical Engineering and Applied Electronics Technology Beijing University of Technology Beijing 100124 P. R. China Beijing Key Laboratory of Electrical Discharge Machining Technology Beiiing 100191 P. R. China Beijing Xinli Machinery Co. Ltd. Beijing 100039 P. R. China

Thin-walled parts have low stiffness characteristic. Initial residual stress of thin-walled blanks is an important influence factor on machining stability. The present work is to verify the feasibility of an initial residual stress measurement of layer removal method. According to initial residual stress experiment for casting ZL205 A aluminum alloy tapered thin-walled blank by a common method,namely hole-drilling method,three finite element models with initial residual stress are established to simulate the layer removal method in ABAQUS and ANSYS software. By analyzing the results of simulation and experiments,the cutting residual stress inlayer removal process has a significant effect on measurement results. Reducing cutting residual stress is helpful to improve accuracy of layer removal method.

关键词： initial residual stress thin-walled parts layer.removal method finite element

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Evaluation of temperature distribution for bone drilling considering aging factor

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Medicine in Novel Technology and Devices 2022年第4期16卷 212-219页

作者： Huanxin Wang xiangsheng gao Boxu Wang Min Wang Yunan Liu Tao Zan Peng gao Chaozong Liu Beijing Key Laboratory of Advanced Manufacturing Technology Faculty of Materials and ManufacturingBeijing University of TechnologyBeijing100124China Beijing Key Laboratory of Electrical Discharge Machining Technology Beijing100191China Beijing Key Lab of Environmental Noise and Vibration Institute of Urban Safety and Environmental ScienceBeijing Academy of Science and TechnologyBeijing100054China Division of Surgery&Interventional Science University College LondonRoyal National Orthopaedic HospitalLondonHA74LPUnited Kingdom

Bone drilling is a routine operation in surgeries,such as neurosurgery and ***,the excessive drilling temperature may cause severe thermal damage to the bone ***,the drilling temperature determination of bone tissue can reduce the harm caused by thermal damage.A time-varying temperature field simulation model of bone drilling was set up by ABAQUS software in this paper,based on the Johnson-Cook *** it was validated with experiments by drilling cortical bone of fresh bovine shaft of the *** relative error between the experimental values and the theoretical values within 7.67%showed a good ***,the aging factor is also considered to evaluate the temperature field of bone *** results showed that the drilling temperature near the bone-drill area increased *** drilling temperature of cortical bone decreases sharply with the radial distance and exhibits a hysteresis lag in the axial *** aging factor mainly affects the peak of drilling *** peak of drilling temperature tends to increase with *** peak drilling temperature in the elderly(70y)was up to 6.8%higher than that in the young(20y),indicating that the elderly is more prone to excessive drilling ***,special attention should be paid to the temperature control of elderly bone tissue.

关键词： Cortical bone Bone drilling Temperature field FEM Aging factor

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Upper bound stability analysis of tiered geosynthetic-reinforced soil wall

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Journal of Rock Mechanics and Geotechnical Engineering 2025年第1期17卷 556-572页

作者： Chengzhi Xiao xiangsheng Meng Shan gao Luqiang Ding School of Civil and Transportation Engineering Hebei University of TechnologyTianjin300401China

The tiered geosynthetic-reinforced soil (GRS) walls have been increasingly applied in the high and steep retaining soil structures. However, very little is known about the design method for the tiered GRS wall in practice. This study is aimed at proposing an upper-bound stability analysis method of a tiered GRS wall. The proposed method was firstly validated by the existing results from the centrifuge test and the numerical method, and then a parametric study was performed to investigate the effects of the cohesionless backfill friction angle φ1 and the wall geometric parameters including the offset distance, the total wall height, the batter angle δ, the number of tiers n, and wall height ratio of adjacent tiers on the dimensionless equivalent earth pressure coefficient KT. The analysis results demonstrated that as the φ1 increases, the shear strength of backfill is enhanced and thus the KT or the total reinforcement tensile force decreases, and the KT decreases with the increase of the offset distance at the initial stage and then becomes stable when it reaches a certain critical value. For a fixed offset distance, the KT or the total reinforcement tensile force decreases with the increase of the δ. For the two-tiered GRS walls having the offset distance less than the critical value, the wall with the smaller wall height ratio has a larger KT. Further, the variation of the location of the critical failure surfaces of tiered GRS walls was presented in this study with the variation of the φ1 and the wall geometry.

关键词： Geosynthetics Tiered GRS walls Offset distance Upper bound theorem Internal stability

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Effect of contact angle and helix angle on slide-roll ratio under the accelerated motion state of ball screw mechanism

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Journal of Southeast University(English Edition) 2017年第4期33卷 398-408页

作者： Kong Deshun Wang Min gao xiangsheng Key Laboratory o f Advanced M anufacturing Technolooy B eijingU niversity o f Technology Beijing 100124 China Institute of Standad Metrology Chinese Academy of Railway Sciences Beijing 100081China

To study the effect of the contact angle and helix angle on slide-roll ratio at the ball contact points under the accelerated motion state of ball screw mechanisrm(B S M),the curve theory in differential geometry a d the homogeneous transformation matrix ae used to establish the acceleration kinematics model of *** model can be used to describe the accelerated motion relationships among the screw,balls and nut,calculate the acceleration of relative motion at the contact points between the balls and raceways,and analyze five accelerated motion rules between the balls and *** also conducts a simulation analysis of the slide-roll ratio relationship between the accelerations at the ball center and the contact point of ball under different contact angles and helix *** shownby the analysis,with the increase in the BSM’s contact angle,the slide-roll ratio at the contact points decreases,and the contact angle has a relatively significant effect on the slide-roll ***,with the decrease in the BSM’helix angle,the slide-roll ratio at the contact points decreases,and the helix angle has a relatively insignificant effect on the slide-roll *** measuring the accelerations of both the screw and nut under the accelerated motion state,it also verifies the existence of the slide-roll mixed motion at the ball contact point A between the ball and the screw racewayand pure rolling at the ball contact point B between the ball and the nut raceway during the accelerated motion.

关键词： ball screw mechanism contact angle helix angle slide-roll ratio

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短纤维层间增韧的三维有限元分析

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复合材料学报 2009年第6期26卷 182-188页

作者：高相胜张凤鹏北京航空航天大学机械工程及自动化学院北京100191 东北大学理学院沈阳110004

层间短纤维强韧化是复合材料层合板层间增韧的有效途径之一。采用三维非线性有限元方法分析了层间短纤维强韧化复合材料层合板的分层扩展问题,探讨其影响因素。以混合模式下通用裂纹扩展的能量准则作为分层扩展判据,通过虚拟裂纹闭合技... 详细信息

层间短纤维强韧化是复合材料层合板层间增韧的有效途径之一。采用三维非线性有限元方法分析了层间短纤维强韧化复合材料层合板的分层扩展问题,探讨其影响因素。以混合模式下通用裂纹扩展的能量准则作为分层扩展判据,通过虚拟裂纹闭合技术计算分层尖端能量释放率。用节点双编号和单元生死技术模拟分层扩展。采用弹簧单元模拟层间短纤维作用,通过改变弹簧刚度修正短纤维桥联力。采用GAP元处理分层区的接触非线性问题。分析了分层区桥联力对层间应力场、位移场以及分层扩展的影响。研究结果表明,层间短纤维有效延缓了分层扩展,增韧效果明显。

关键词：复合材料层合板层间短纤维增韧能量释放率分层扩展

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双螺母定位预紧滚珠丝杠副轴向接触刚度分析

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机械工程学报 2014年第7期50卷 60-69页

作者：胡建忠王民高相胜昝涛北京工业大学先进制造技术北京市重点实验室北京100124

提出一种新的滚珠丝杠副刚度分析方法,建立螺母所受轴向力与滚道正压力之间的关系,分析滚道接触点处的法向变形与螺母相对于丝杠的轴向位移之间的关系。综合考虑滚珠、螺母和丝杠滚道的几何参数,将接触角、公称半径以及螺旋升角作为未知... 详细信息

提出一种新的滚珠丝杠副刚度分析方法,建立螺母所受轴向力与滚道正压力之间的关系,分析滚道接触点处的法向变形与螺母相对于丝杠的轴向位移之间的关系。综合考虑滚珠、螺母和丝杠滚道的几何参数,将接触角、公称半径以及螺旋升角作为未知量,建立滚珠丝杠副接触角模型。在此基础上,根据Hertzian接触理论建立了滚珠丝杠副的轴向刚度模型,该模型综合考虑了接触角的变化与滚道正压力之间的耦合关系。根据所建立的刚度模型分别研究了单螺母滚珠丝杠副和双螺母定位预紧滚珠丝杠副的刚度特性。研究结果表明,对于几何参数相同的滚珠丝杠副,在外加轴向力较小时双螺母预紧滚珠丝杠副的刚度明显大于单螺母滚珠丝杠副,随着外加轴向力的增大它们的刚度值逐渐趋近,最后达到相同;双螺母定位预紧滚珠丝杠副的预紧力越大,初始刚度值越大。

关键词：接触刚度滚珠丝杠副预紧力接触角赫兹接触理论

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