关键词: 货车轴承, 多普勒效应, 时域插值, 声源定位

Abstract: For problems of frequency shift and bandwidth extension of high-speed movement in wayside wheel-bearing acoustic diagnosis, a Doppler effect removal method was proposed based on time difference of arrival and time-domain interpolation. Based on the defect of characteristic frequencies and moving characters of bearings, the placement rules of the trackside microphone array was designed. Through framing, windowing and cross-correlation, the time delay differences among microphones are calculated. The time difference of arrival technique was introduced to estimate the moving position and propagation delay of fault bearings in real time. Through the time domain interpolation, the acoustic signal is received without extension based on the time series of moving bearings. Simulation demonstrates that the algorithm can remove the Doppler effect of acoustic signal effectively in low signal to noise ratio. It is suitable for both constant and variable speed.

Key words: wheel-bearing, Doppler effect, time-domain interpolation, acoustic source location