Noise Reduction Method of Tunnel Blasting Vibration Signal Based on VMD and Energy Entropy
In order to obtain the real tunnel blasting vibration signal from the monitoring signal,a denoising method for tunnel blasting vibration signal based on Variational Mode Decomposition(VMD)and energy entropy is introduced.Firstly,the monitoring signal is decomposed by variational modes under different K values to obtain a series of Intrinsic Mode Functions(IMF),and the correlation coefficient between each intrinsic mode function and the original signal is calculated,and the opti-mal K value is determined based on the correlation coefficients.Secondly,the original signal is decomposed by variational modes to obtain a series of intrinsic mode functions with center frequencies from high to low,and the energy entropy of each in-trinsic mode function is calculated to confirm the boundary between noise and signal.Finally,the signal components are recon-structed and the denoised tunnel blasting signal is obtained.The results show that,compared with Empirical Mode Decomposi-tion(EMD)noise reduction method,the signal-to-noise ratio is higher,the percentage of residual energy is also higher,and the mean square error is lower,which shows that the proposed noise reduction method has certain applicability in tunnel blasting vibration signal processing.
万方数据
维普
