Application of FSWT_SVD Model for Feature Extraction of Rock Mass Microseismic Signal

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (14) : 52-60.

SHANG Xueyi1 LI Xibing1 PENG Kang2,3 WANG Zewei1 WENG Lei1

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Abstract

To solve the problem that it is difficult to identify rock mass fracturing signals and blasting vibration signals, the Fourier transform (FT) was applied to gain their spectrum distributions and six frequency bands were needed for the feature extraction analysis. Then the rock mass fracturing signals were divided and reconstructed by frequency slice wavelet transform (FSWT), and the singular value decomposition (SVD) was employed to obtain singular values of matrixes composed of the six reconstructed components, thus the feature extraction of rock mass fracturing signals was implemented. Furthermore, 120 sets of rock mass fracturing signals and 120 sets of blasting vibration signals obtained from Yongshaba mine were analysed using the FSWT_SVD method. Finally, the back propagation (BP) neural network was adopted to train, classify and recognize the eigenvectors obtained from the singular values. The results show that: (1) There are large differences of , comparatively large differences of , , and , and little differences of between rock mass fracturing signals and blasting vibration signals, and the best pattern recognition was obtained when is eight with an accuracy rate of 86.67%. (2) The classification result based on BP neural network is the best among the BP, Logistic Regression (LR), Bayes and Fisher based methods, the feature matrix obtained by the SVD is better than that obtained by the energy ratio and correlation coefficient matrix, and the feature matrix obtained from FSWT is better than that of discrete wavelet transform (DWT). Furthermore, the BP classifier based on FSWT_SVD achieves a correct identification rate of 91%. In conclusion, the BP classifier based on FSWT_SVD provides a new way for feature extraction and pattern recognition of rock mass fracturing signal and blasting vibration signal.

Key words

/ Rock mass microseismic signal；frequency slice wavelet transform(FSWT)；singular value decomposition(SVD)；feature extraction；pattern recognition

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SHANG Xueyi1 LI Xibing1 PENG Kang2,3 WANG Zewei1 WENG Lei1. Application of FSWT_SVD Model for Feature Extraction of Rock Mass Microseismic Signal[J]. Journal of Vibration and Shock, 2017, 36(14): 52-60

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