Frequency Spectrum and Wavelet Packet Analyses of Blasting Vibration Signals for Different Charge Structures in Blasting Peripheral Holes

Figure 7

Energy percent distribution diagram of the usual charge and cutting seam charge during 250 Hz. 1: 0–31.25 Hz, 2: 31.25–62.5 Hz, 3: 62.5–93.75 Hz, 4: 93.75–125 Hz, 5: 125–156.25 Hz, 6: 156.25–187.5 Hz, 7: 187.5–218.75 Hz, and 8: 218.75–250 Hz.