液体静压转台系统动力学分析及参数影响  

Dynamic Analysis and Parameters' Influences on Hydrostatic Worktable System

作　　者：叶红玲[1] 邵沛泽[1] 文聘[1] 陈宁[1] 

机构地区：[1]北京工业大学机械工程与应用电子技术学院,北京100124

出　　处：《北京工业大学学报》2015年第10期1508-1515,共8页Journal of Beijing University of Technology

基　　金：国家自然科学基金资助项目(11072009);北京市人才强教计划中青年骨干项目(PHR20110801)

摘　　要：为了控制液体静压转台系统的振动,将液体静压转台系统承载力进行了泰勒展开,从而将非线性油膜力等效简化为弹簧阻尼器系统,建立了液体静压转台系统的有限元模型,并对系统进行模态分析和谐响应分析,研究了油腔几何参数对系统动力学特性的影响,探讨了油腔数目、材料弹性模量、等效油膜刚度及等效油膜阻尼等参数对系统动位移的影响.结果表明:随着油腔外半径、初始油膜厚度和油腔深度的增大,系统的固有频率值将减小;封油边宽度增大,系统固有频率则增大.根据油腔布局的不同可以看到:4油腔系统的动位移最小,16油腔系统的动位移最大,系统在低频范围的动位移比高频范围大.材料弹性模量、等效油膜刚度和等效油膜阻尼对动位移有显著影响.该研究为液体静压转台系统的动态设计和提高转台的加工精度提供了参考依据.In order to control the vibration of the hydrostatic turntable system,the bearing capacity of hydrostatic turntable system was expanded by the Taylor method,and the nonlinear oil film force was simplified equivalently as a spring- damper system.A finite element model was established for the hydrostatic turntable system.Based on this model,model analysis of the system was conducted to study the influence of the geometry parameters of oil chamber on the system dynamics.And harmonic response analysis was conducted to discuss the effect of the recess number,elastic modulus,equivalent oil film stiffness and damping coefficients on the system dynamic displacement.The results show that the natural frequency reduces with the increasing of recess outer radius,initial oil film thickness and recess depth.However,the natural frequency is increasing with the increase of oil seal width.It can be seen from the layout of the oil chamber,that the dynamic displacement of four recesses system is the least while the dynamic displacement of sixteen recesses system is the largest.Dynamic displacement in the low frequency range of the system is greater than that of the high-frequency range.This study provides reference for the dynamic design of the hydrostatic turntable system and for the improvement of machining precision of the turntable systems.

关 键 词：液体静压转台 动力学特性 动响应 固有频率 参数分析 

分 类 号：U461[机械工程—车辆工程] TP308[交通运输工程—载运工具运用工程]