TIME-FREQUENCY CHARACTER-ISTIC OF BLAST VIBRATION SIGNATHREE-DIMENSIONAL FRACTAL STUDY ON THE L

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Journal of Vibration and Shock ›› 2010, Vol. 29 ›› Issue (12) : 118-121,.

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TIME-FREQUENCY CHARACTER-ISTIC OF BLAST VIBRATION SIGNATHREE-DIMENSIONAL FRACTAL STUDY ON THE L

XIE Quan-min1, 2; LONG Yuan1; TIAN Zuo-wei3; ZHANG Yang-yi1; JI Chong1

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Abstract

To further study the characteristics of blast vibration signals, time-frequency energy character-istics of blast vibration signals were analyzed based on wavelet packet transform. The three-dimensional fractal surface box dimension model was established based on two-dimensional rectangular box covering method. By analyzing the measured blasting vibration signal data, fractal dimension of the three-dimensional time-frequency energy spectrum is 2.1488, which meets the condition for space fractal dimen-sion , and verifies that the time-frequency energy spectrums of blasting vibration signals have fractal characteristics. By studying the relationship between the three-dimensional fractal surface and two-dimensional box dimension of its section, the assumption of for traditional surface fractal dimension calculation method is not exactly. The study indicates, cuboids’ covering surface calcula-tion method for fractal dimension is feasible and effective, which provides a new idea for further study of blast vibration characteristics and the blasting seismic effect control.

Key words

blast vibration / wavelet packet transform / time-frequency characteristics / three-dimensional fractal / box dimension

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XIE Quan-min;;LONG Yuan;TIAN Zuo-wei;ZHANG Yang-yi;JI Chong. TIME-FREQUENCY CHARACTER-ISTIC OF BLAST VIBRATION SIGNATHREE-DIMENSIONAL FRACTAL STUDY ON THE L[J]. Journal of Vibration and Shock, 2010, 29(12): 118-121,