BKX-Ⅰ型并联机床动力学分析

The Dynamic Analysis on BKX-ⅠPKM

应用子结构法建立了一种UPS型6自由度并联机床及其部件的有限元实体模型,并通过模态实验和有限元模态分析对有限元实体模型进行了验证.应用有限元法对机床模型进行了谐响应分析.获得了机床各节点沿机床虚拟x、y、z轴向的位移谐响应曲线.在此基础上,对该并联机床谐响应规律进行了分析,明确了该机床谐响应的特点和响应幅度的数量级,为该类机床的结构优化设计提供了理论依据.

A finite element full-scale entity model for 6-UPS parallel kinematic machine （PKM） and its accessories are established based on substructure method. It is further confirmed through a modality study and a finite element modality analysis. The displacement harmonic response curves of the nodes on the virtual x, y and z axes of PKM are obtained through a harmonic response analysis on PKM performed with a finite element method. Based on these resultant curves, a law of harmony response on the PKM is investigated. The resultant parameters clearly demonstrate a harmony response characteristic of PKM and its response scope magnitude, which can provide an important theoretical basis for the optimal structure design of PKM.