国产欧美精品一区二区,中文字幕专区在线亚洲,国产精品美女网站在线观看,艾秋果冻传媒2021精品,在线免费一区二区,久久久久久青草大香综合精品,日韩美aaa特级毛片,欧美成人精品午夜免费影视

For the doppler distortion problem for motion source signals collected by microphones. The method for correcting the acoustic signal of a rolling bearing Doppler distortion based on automatic peak search and shannon entropy. Firstly, the collected sound signal is analyzed by short time Fourier (STFT) time-frequency analysis; then, the instantaneous frequency estimation is performed using the automatic peak search method, the shannon entropy is set to improve the accuracy of the instantaneous frequency estimation, and the fitted instantaneous frequency curve is obtained. Then the signal re-sampling time point is obtained; in the end, the original signal is re-sampled in the time domain so that the distortion signal can be corrected. The feasibility of this method is verified by experiments using acoustic signals of the inner and outer rings of the simulation and dynamic rolling bearing.