Time–frequency characteristics of blasting vibration signals measured in milliseconds

Abstract

In order to study the time–frequency characteristics of blasting vibration signals, measured in milliseconds, we carried out site blasting vibration tests at an open pit of the Jinduicheng Mine. Based on recorded field data and applying a combination of RSPWVD and wavelet, we analyzed the time–frequency characteristics of recorded field data, summarized the time–frequency characteristics of blasting vibration signals in different frequency bands and present detailed information of blasting vibration signals in milliseconds of high time–frequency resolutions. Because RSPWVD can be seen as of definite physical significance to signal energy distribution in time and frequency domains, we studied the energy distribution of blasting vibration signals for various milliseconds intervals from a perspective of energy distribution. The results indicate that the effect of milliseconds intervals on time–frequency characteristics of blasting vibration signals is significant; the length of delay time directly affects the energy distribution of blasting vibration signals as well as the duration of energy in frequency bands.