多普勒畸变声学信号的伪时频分析及其校正

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振动与冲击 ›› 2016, Vol. 35 ›› Issue (5) : 14-20.

论文

多普勒畸变声学信号的伪时频分析及其校正

张海滨1，陆思良1，何清波1，孔凡让1

作者信息 +

Fake time-frequency analysis of acoustic signal with Doppler distortion and its correction

ZHANG Haibin 1 LU Siliang 1 HE Qingbo 1 KONG Fanrang 1

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摘要

位于运动轨迹旁的麦克风采集的运动声源信号存在多普勒畸变现象，这增加了信号分析的难度，特别对于高速列车道旁声学故障诊断工作。为了提高诊断的准确性和可靠性，本文提出了一种新的基于摩尔斯声学理论的多普勒信号伪时频分析，该分析给出了一种伪时频分布，对信号的时间中心和特征频率进行了有效估计，得到的参数用于信号重采样以校正其多普勒畸变，校正信号中能有效提取出信号中包含的故障信息。仿真信号和实验信号的分析结果表明，该方法能够用于提取多普勒畸变信号的参数，并加以校正，在道旁声学故障诊断中有较好的应用前景。

Abstract

With the Doppler distortion effect for acoustic signal of moving acoustic source acquired by microphone from wayside, the signal analysis gets difficulty especially for the wayside acoustic fault diagnosis work of train bearings. To improve the veracity and reliability of diagnosis, we propose a fake time-frequency analysis (FTFA) for Doppler signal based on Morse acoustic theory. The FTFA provides a fake time-frequency distribution (FTFD) which comes up with the time center and characteristic frequency. The estimated parameters are utilized for the correction of Doppler distortion by signal resampling. The corrected signal is analyzed for extracting fault information expediently. Both the simulation and experiment results indicate that the strategy helps to estimate the Doppler parameters effectively and offers the possibility for correction. It is also expected to be widely used in wayside defective bearing detection.

Key words: fault diagnosis; Doppler distortion; acoustic signal; fake time-frequency analysis

关键词

故障诊断 / 多普勒畸变 / 声学信号 / 伪时频分析

Key words

fault diagnosis

/ Doppler distortion / acoustic signal / fake time-frequency analysis

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张海滨1，陆思良1，何清波1，孔凡让1. 多普勒畸变声学信号的伪时频分析及其校正[J]. 振动与冲击, 2016, 35(5): 14-20

ZHANG Haibin 1 LU Siliang 1 HE Qingbo 1 KONG Fanrang 1. Fake time-frequency analysis of acoustic signal with Doppler distortion and its correction[J]. Journal of Vibration and Shock, 2016, 35(5): 14-20

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