关键词: 滚珠丝杠, 扭转振动, 有限元, 测量

Abstract:

It is difficult to identify the torsional vibrating modes of ball screw feed drive systems, a new measuring and analysis method was proposed herein, which involved several straightforward steps. Firstly, a high-resolution rotating encoder was installed at the end of the screw,and the high-speed counting cards were then used to measure the acceleration signals intercepted by this encoder and the inbuilt one attached to the servo motor respectively. The signals were further analyzed in the frequency domain. The analysis results were subsequently used to fine-tuning the numerical calculation based on a finite-element and lumped-parameter model built for simulating the ball screw feed drives, which finally allowed recognition of the natural torsional vibration frequencies and corresponding mode shapes. The case study presented herein shows that the proposed method can be used to precisely estimate the first and second order torsional vibration natural frequencies and corresponding mode shapes of a ball screw feed drive system effectively.

Key words: ball screw, torsional vibration, finite element method, measurement