Blast vibration signal analysis based on wavelet packets of a mine

In order to understand blast vibration wave propagation of a mine, noise and signal components of each band are extracted on the basis of signal de-noising after four layers signal decomposition with db8 wavelet packet. Analysis shows that aliasing of real signal and noise will cause PPV increasing or decreasing which can reduce the accuracy and reliability of the original signal. Real signals are distribution within 0~256 Hz with no significant concentration in each frequency band. But, in the same blasting, with the increasing of propagation distance, speed tends to concentrate on low frequency. Finally, attenuation law of blasting vibration wave formula is acquired by linear fitting of data which provides the basis for the mine blasting design.