基于时频脊线旋转匹配的多普勒矫正方法研究

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摘要多普勒效应使信号产生畸变，增加了道旁高速列车声学故障诊断的难度。时域重采样是一种有效的多普勒畸变矫正方法，该方法需要对时间中心有一个准确估计。在深入分析多普勒畸变信号瞬时频率变化特征的基础上，提出一种新的多普勒畸变校正方法。首先用时频融合技术提高时频图的分辨率，然后对时频脊线旋转匹配以获得时间中心，从而求得重采样序列用以校正多普勒畸变。仿真信号和实验信号分析结果表明，该方法能有效实现多普勒矫正，在道旁声学故障诊断中有一定的可行性。

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关键词 ：故障诊断, 多普勒畸变, 声学信号, 时频图旋转匹配

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

收稿日期: 2016-04-12 出版日期: 2017-08-28

引用本文:

刘星辰1，胡智勇1，何清波1，朱军1. 基于时频脊线旋转匹配的多普勒矫正方法研究[J]. 振动与冲击, 2017, 36(17): 29-34.
LIU Xing-chen 1 HU Zhi-yong1HE Qing-bo 1ZHU Jun1. Doppler correction based on rotation matching of time-frequency ridge. JOURNAL OF VIBRATION AND SHOCK, 2017, 36(17): 29-34.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2017/V36/I17/29

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