多普勒畸变声学信号的伪时频分析及其校正

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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

Key words： fault diagnosis')" href="#">

fault diagnosis Doppler distortion acoustic signal fake time-frequency analysis

Received: 11 December 2014 Published: 25 February 2016

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