Time Frequency Analysis of Blasting Vibration Superposing Signal under Different Millisecond Intervals

Abstract:

Based on the measured single-stage blasting vibration signal, time-frequency characteristics of two single-stage superposing signals were analyzed under the condition of different millisecond intervals ranging from 1ms to 350ms, also, variation laws of dominant frequency, amplitude and energy of the blasting vibration superposing signal with the delay time and the determination method of rational millisecond interval of similar engineering were put forward. Then, changing laws of the millisecond interval with the interference effect was obtained. It is found that, millisecond delay blasting does not follow the disturbance vibration reduction theory strictly that the vibration effect is weakened when interval is (2n-1)T/2 and strengthened when interval is nT, and the more similar the vibration characteristics of single-stage signals are, the larger the maximum amplitude declining rate of the obtained superposing signal is.

• Periodical: Applied Mechanics and Materials (Volumes 170-173)
• Pages: 3097-3101
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.170-173.3097
• Online since: May 2012
• Authors: Wei Zhang*, Shi Hai Chen
• Keywords: Blasting Vibration, Millisecond Interval, Time-Frequency Characteristics, Vibration Reduction by Waveform Interference, Waveform Superposition

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