中文摘要：

针对滚珠丝杠副丝杠滚道故障定位困难问题,对存在单一点蚀故障的滚珠丝杠副进行了研究,提出了一种基于短时傅里叶变换（STFT）的滚珠丝杠副丝杠滚道故障定位方法,通过理论分析确定了针对滚珠丝杠副振动信号STFT理想的窗函数及其参数。利用STFT分析了滚珠丝杠副仿真与实验振动加速度信号,根据丝杠滚道出现故障时的频率响应特性以及信号瞬时频率随时间的变化,以瞬时频率为特征确定了故障位置。仿真与实验研究结果对比表明,STFT时频分析方法能够用于有效地识别出滚珠丝杠副的故障位置。

英文摘要：

Aiming at the problems of fault location for ball screw,a ball screw with a single localized defect was studied,and a method based on STFT for fault location of ball track of ball screw shaft was proposed. By theory analysis,the perfect window function used in STFT of vibration signal of ball screw was defined. Short-time Fourier transform（STFT）was used to analyse the vibration acceleration signal of ball screw,according to the frequency response characteristic of ball screw with defect in screw raceway and the instantaneous frequency of signal changes with time,fault was located by using the instantaneous frequency as characteristic.Compared the experimental results with simulated results,it is indicated that STFT can recognise the fault location of ball screw effectively.