Energy characteristics of blast vibration signals of open-pit slope based on VMD-Teager

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (7) : 77-88.

XU Zhenyang1, MO Hongyi1, BAO Song1, ZHAO Jianyu1, WANG Xuesong2, LIU Xin1, CHEN Zhanyang3

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Abstract

The characteristic analysis of blasting vibration signal is one of the most effective methods to study slope stability. Combining the strong local search ability of Simulated Annealing (SA) and the characteristics of global automatic optimization of Genetic Algorithm (GA). Fuzzy Entropy (FE) is selected as the fitness function of the modal component. Solve the optimal decomposition parameters of Variational Modal Decomposition (VMD). And then, by combing the Intrinsic Modal Function (IMF), criterion of trend item and complex correlation coefficient principle, the propose a trend term removal method. Since the Teager energy operator demodulation of single component signal has higher demodulation speed and accuracy than Hilbert transform. The VMD-Teager energy operator demodulation method based on trend term filtering is proposed, to obtain the energy distribution characteristics of blast vibration signals. The result demonstrates that VMD is more accurate and effective than EMD in removing signal trend terms. It can solve the problem, such as baseline deviation and low frequency interference existing in original vibration signal. The blasting vibration energy is mainly low frequency. PPV, primary frequency and energy perform a “W” pattern of transformation. The attenuation speed of PPV and primary frequency is in the same order of magnitude as the amplification coefficient. However, the attenuation speed and amplification coefficient of the energy peak are much higher than the variation speed of PPV and primary frequency, which are 3.42 ~ 5.9 times of PPV and primary frequency, and 2.07 ~ 3.12 times of amplification coefficient.

Key words

blasting vibration / Variational Mode Decomposition / Teager / trend term / energy distribution

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XU Zhenyang1, MO Hongyi1, BAO Song1, ZHAO Jianyu1, WANG Xuesong2, LIU Xin1, CHEN Zhanyang3. Energy characteristics of blast vibration signals of open-pit slope based on VMD-Teager[J]. Journal of Vibration and Shock, 2023, 42(7): 77-88

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