Waveburner frequency blast3/11/2023 ![]() When the distance is constant, the peak energy of blast vibration signals increase with the increase of explosive charge, without obvious change in main frequency band. When the explosive charge is constant, the span of main frequency reduces as a whole as the distance increases, and the frequency domain energy of blast vibration signals are concentrated mainly in the low-frequency range. Results show that the main frequency band based on the computational method is a sensitive, accurate and efficient frequency parameter it can accurately describe the frequency characteristics of blasting signals and effectively overcome the drawbacks in Fourier transform. The effects of explosive charge and distance on main frequency band distribution characteristics are also studied. To verify the feasibility of main frequency band and the proposed computational method in describing blasting frequency characteristics, an application is exemplified with field blasting vibration signals monitored in a mine. A computational method associated with the wavelet packet transform is also proposed. ![]() Due to the deficiency of Fourier transform in the analysis of non-periodic and non-stationary signals, this study defined a wavelet frequency domain parameter, referred to as a main frequency band. As a key parameter in blasting safety criteria, accurately describing the frequency's characteristics is of practical significance.
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