Doppler correction based on rotation matching of time-frequency ridge

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (17) : 29-34.

LIU Xing-chen 1 HU Zhi-yong1HE Qing-bo 1ZHU Jun1

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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

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LIU Xing-chen 1 HU Zhi-yong1HE Qing-bo 1ZHU Jun1. Doppler correction based on rotation matching of time-frequency ridge[J]. Journal of Vibration and Shock, 2017, 36(17): 29-34

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