Suppression method for cross term interference in time-frequency spectrum of tunnel blasting vibration signal

被引：0
|
作者：
Fu X. [1 ,2 ,3 ]
Yu J. [2 ]
Dai L. [3 ]
Qin S. [1 ]
机构：
[1] School of Civil Engineering, Sanming College, Sanming
[2] Fujian Research Center for Tunneling and Urban Underground Space Engineering, Huaqiao University, Xiamen
[3] Sanming Coffer Fine Chemical Industrial Co., Ltd., Sanming
来源：
Zhendong yu Chongji/Journal of Vibration and Shock | 2021年 / 40卷 / 19期
关键词：
Blasting vibration signal; Cross term suppression; Matching pursuit (MP); Smooth pseudo-Wigner-Ville distribution (SPWVD); Time-frequency analysis;
D O I：
10.13465/j.cnki.jvs.2021.19.008
中图分类号：
学科分类号：
摘要：
Here, aiming at the difficulty problem of cross term interference existing in time-frequency spectrum of blasting vibration signal, the combination algorithm of matching pursuit (MP) and smooth pseudo-Wigner-Ville distribution (SPWVD) was adopted to suppress cross term in time-frequency spectrum and extract features of tunnel blasting vibration signal. According to the theory of signal sparse representation and matching pursuit, an overcomplete sparse atom library was constructed to match signal features. The atomic reconstruction of sub-signals was realized through matching pursuit decomposition, and the reconstructed sub-signals' SPWVD distributions were calculated and superposed to obtain a more accurate time-frequency representation of blasting signal. The results showed that MP-SPWVD combination method can be used to weaken and suppress cross term interference in time-frequency spectrum of blasting vibration signal, improve the signal time-frequency recognition degree and its time-frequency feature analysis ability, and verify the accuracy and effectiveness of MP-SPWVD combination method in signal time-frequency analysis; MP-SPWVD combined algorithm is suitable for the time-frequency feature extraction of blasting vibration signal. © 2021, Editorial Office of Journal of Vibration and Shock. All right reserved.
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页码：59 / 65and79
页数：6520
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