Multi-resolution wavelet analysis of blasting vibration signals

With the methods of wavelet analysis and fast Fourier transform, actual original signals from engineering project in near, medium and far zones of blasting vibration are separately decomposed and reconstructed; and time signals and spectra of all sub-frequencybands are obtained. On this basis, distribution characteristics of spectra and energy of blasting seismic waves along all zones are studied with Matlab; and it is pointed out, that the values of dominant frequency in blasting vibration zones is in attenuation sequence: near zone, medium zone, far zone; as the scaled distance increases, low frequency bands share higher proportion of total signal energy, while high frequency bands share lower; signals in lower frequency bands have longer duration; in addition to the frequency band that the dominant frequency locates in, when the band is from 0 to 2.441 5 Hz (close to the natural frequency of the buildings), blasting vibration signals in the horizontal direction occupy an assignable proportion of the energy; and thus the aseismic construction in horizontal direction is especially important for building structure designs.