基于时频脊线旋转匹配的多普勒矫正方法研究

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Abstract Doppler effect causes acousticsignal distortion, increasing the difficulty of wayside acoustic fault diagnosis of high-speed trainbearings. Time-domain resampling is an effective Doppler correction method which requires an accurate estimation of the time center. Based on the feature of instantaneous frequency of the Doppler signal, this paper proposed a new Doppler correction method. Firstly, the time-frequency fusion technique was applied to improve the resolution of time-frequency representation. Then the time-frequency ridgewas rotated and matched with the original one to achieve the time center. Finally, the resampling sequence was calculated and utilized to correct the Doppler distortion. Simulations and experiments demonstrated that this proposed method can effectively correct the Doppler distortion and has a good prospect in application to the wayside acoustic fault diagnosis.

Key words： fault diagnosis Dopplerdistortion acoustic signal rotation matching of time-frequency ridge

Received: 12 April 2016 Published: 28 August 2017

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2017/V36/I17/29

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