刚度主轴方位对模态耦合再生切削系统动态响应谐参数的影响  

Influence of orientations of principal stiffness axes on harmonic parameters of dynamic response in mode-coupled regenerative machining system

作　　者：林洁琼[1,2] 周晓勤[2] 孔繁森[2] 王文才 于骏一[2] 

机构地区：[1]长春工业大学机电工程学院,长春130012 [2]吉林大学机械科学与工程学院,长春130022 [3]密西根大学安娜堡分校机械工程系,安娜堡mi481092136

出　　处：《振动与冲击》2009年第5期63-68,共6页Journal of Vibration and Shock

基　　金：国家自然科学基金资助项目(50775099);教育部博士点基金资助项目(20070183104)

摘　　要：综合考虑再生切削效应和模态耦合效应,建立了随机扰动激励下两自由度切削加工系统的时滞动力学模型。分析了刚度主轴方位对切削稳定性叶瓣的影响。将切削系统的动态响应作为观测数据,基于互四阶累积量的谐参数联合估计ESPRIT方法,考察了刚度主轴方位对模态耦合再生切削系统动态响应的互功率、频率和相移等谐参数的影响,揭示了这些谐参数关于刚度主轴方位角的一些新依赖特征。Both regenerative cutting and mode-coupling principles were taken into consideration to model the delayed dynamics of regenerative machining system under stochastic excitation.The influences of the orientations of principal stiffness axes on machining instability lobes were analyzed.The dynamic responses of machining system were sampled as the observation data.The cross fourth-order cumulant based ESPRIT approach for jointly estimating harmonic parameters was proposed,which is applied to investigate the influence of the orientations of principal stiffness axes on the harmonic parameters of dynamic response in mode-coupled regenerative machining system.Several novel dependent characteristics of the harmonic parameters on the orientations of principal stiffness axes was disclosed,these harmonic parameters include frequency,phase shift and cross power of the dynamic machining responses.

关 键 词：机床 再生切削 模态耦合效应 动态稳定性 互高阶累积量 

分 类 号：TH161[机械工程—机械制造及自动化]