列车轴承声学信号中心时间获取及短周期校正方法研究
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孙亚丽(1988—),女,博士研究生,研究方向为高速列车轴承故障诊断。E-mail:184977396@qq.com。

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U279

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国家自然科学基金青年科学基金项目(62001079)


Short-Period Doppler Correction Method of Rolling Bearing Based on Center Time of Acoustic Signal
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    摘要:

    轨边声学检测系统通常位于铁路两旁,这就使得列车和声学采集装置之间存在高速的相对运动,进而导致所采集到的声源信号受到严重的多普勒畸变干扰,给列车走行部件的声学检测带来了极大的挑战。 针对这一问题,提出了一种声学信号中心时间获取及短周期多普勒校正方法。 文章首先根据莫尔斯声学理论获得了声学信号中心时间处的畸变情况;进而通过匹配畸变信号和理论信号的时频曲线获得了最优中心时间;最后结合所得到的最优中心时间点对接收到的声学信号进行校正,并通过仿真和实验验证了该方法的有效性和正确性。

    Abstract:

    The trackside acoustic detection systems are usually located on the sides of the railway, which causes high speed motion between the train and the acoustic acquisition device relatively. As a result, the collected sound source signals are interfered by severe Doppler distortion, which brings great challenges to the acoustic detection of train running components. Aiming at this problem, a short-period Doppler correction method based on center time was proposed. First, the distortion at the center time of the acoustic signal was obtained according to the Morse acoustic theory. Then, the optimal center time was obtained by matching the time-frequency curve of the distortion signal and the original signal. Finally, the received acoustic signal was corrected based on the optimal center time point, and the effectiveness and correctness of the method were verified through simulation and experiment.

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孙亚丽,李花,赵兴,费继友.列车轴承声学信号中心时间获取及短周期校正方法研究[J].华东交通大学学报,2021,38(2):110-115.

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  • 在线发布日期: 2021-06-18
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