北京邮电大学学报

  • EI核心期刊

北京邮电大学学报 ›› 2016, Vol. 39 ›› Issue (5): 42-46.doi: 10.13190/j.jbupt.2016.05.009

• 论文 • 上一篇    下一篇

高速移动铁路货车轴承声信号多普勒效应去除方法

陈斌, 付彧, 高宝成   

  1. 北京邮电大学 自动化学院, 北京 100876
  • 收稿日期:2016-06-06 出版日期:2016-10-28 发布日期:2016-12-02
  • 作者简介:陈斌(1980-),男,博士,副教授,E-mail:binchen@bupt.edu.cn.
  • 基金资助:
    国家青年科学基金项目(11304019)

Doppler Effect Removal of Acoustic Signal for High-Velocity Wheel-Bearings

CHEN Bin, FU Yu, GAO Bao-cheng   

  1. School of Automation, Beijing University of Posts and Telecommunications, Beijing 100876, China
  • Received:2016-06-06 Online:2016-10-28 Published:2016-12-02

摘要: 针对货车滚动轴承轨边声学诊断中高速移动带来的声信号频移和频带扩展问题,提出一种基于到达时差和时域插值的多普勒畸变信号矫正方法.通过对轴承运动特性与故障特征频率分析,建立轨边传声器阵列的布放准则,在此基础上通过对阵列检测声信号进行分帧加窗和互相关分析,计算传声器间时延差;引入到达时差技术实时估计故障轴承的移动位置和传播时延,通过时域插值,获得以移动轴承发声时间序列为基准的无时延接收声信号.仿真结果表明,该方法在低信噪比时仍可有效矫正多普勒畸变的声信号,且适用于定转速及变转速场合.

关键词: 货车轴承, 多普勒效应, 时域插值, 声源定位

Abstract: For problems of frequency shift and bandwidth extension of high-speed movement in wayside wheel-bearing acoustic diagnosis, a Doppler effect removal method was proposed based on time difference of arrival and time-domain interpolation. Based on the defect of characteristic frequencies and moving characters of bearings, the placement rules of the trackside microphone array was designed. Through framing, windowing and cross-correlation, the time delay differences among microphones are calculated. The time difference of arrival technique was introduced to estimate the moving position and propagation delay of fault bearings in real time. Through the time domain interpolation, the acoustic signal is received without extension based on the time series of moving bearings. Simulation demonstrates that the algorithm can remove the Doppler effect of acoustic signal effectively in low signal to noise ratio. It is suitable for both constant and variable speed.

Key words: wheel-bearing, Doppler effect, time-domain interpolation, acoustic source location

中图分类号: