Research on Blasting Vibration Signal Denoising Method in Freezing Vertical Shaft

According to the characteristics of high noise, short duration and nonlinear of freezing vertical shaft blasting vibration signal in practical engineering, the method of EMD-DFA （Empirical Mode Decomposition-Detrended Fluctuation Analysis） combining de-noising method is proposed. Four indexes were used to evaluate the de-noising effect of EMD-DFA, EMD and EEMD, wavelet threshold and wavelet entropy. The results show that: the blasting vibration signals including strong noise pollution by using the combined method of EMD-DFA de-noising, SNR and cross-correlation is the highest, the corresponding error is minimum, the de-noising signal retains the transient characteristics of non-stationary signal blasting, de-noising effect is optimal.