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Fault location on ball track of ball screw shaft based on STFT

Published:2015-06-08 author:ZHANG Zi-feng，HU Jian-zhong Browse: 2720 Check PDF documents

Fault location on ball track of ball screw shaft based on STFT

ZHANG Zi-feng，HU Jian-zhong

（School of Mechanical Engineering，Southesat University，Nanjing 211189，China）

Abstract：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.

Key words：ball screw；screw raceway；fault location；short-time Fourier transform（STFT）

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