Vibration Signal Analysis of Water Seal Blasting Based on Wavelet Threshold Denoising and HHT Transformation

Figure 11

Comparison of instantaneous energy and waveforms. (a) Conventional charge structure. (b) Water interval charge at both ends. (c) Water interval charge at the orifice. (d) Water interval charge at the hole bottom.

(a)

(b)

(c)

(d)