直线滚动导轨动力学精细有限元建模

提出一种可以减少或避免繁琐实验的、通用的导轨精细有限元建模方法.从分析单个滚珠-沟槽的接触特性出发,确定了在不同预紧力作用下单个滚珠的接触刚度；用弹簧质量单元模拟单个滚珠-沟槽的接触,在充分考虑滚珠分布的基础上完成了导轨系统的精细有限元建模.详细描述了创建该有限元模型的具体流程以及关键步骤,并以THK公司生产的SHS-35R型导轨为例进行了实例研究.获得了该导轨系统的固有特性,并与解析模型分析结果相比较,二者计算分析结果基本相符,从而证明所建模型的正确性.

A precise finite element modeling approach for analyzing linear rolling guideway dynamics

In order to reduce or avoid the tedious experiment for the dynamics modeling of the linear rolling guideway, a general finite element modeling approach is presented. Firstly, the contact characteristic between a single ball and groove is analyzed, and the relative contact stiffness of single ball is determined under different preload levels. Next, using the spring-mass elements to simulate the contact of single ball and groove, and the precise finite element model is created on the basis of considering the distribution of the balls. The detailed procedure and key steps of creating the precise finite element mode are introduced. At last, the SHS-35R guideway produced by THK Corporation is chosen as study object, and its nature characteristics are obtained. The analysis results are found identical with the analytical solution, which proves the proposed approach is correct.