Time-frequency analysis of vibration signal of underwater target by underwater explosion between two explosive charges

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Journal of Vibration and Shock ›› 2013, Vol. 32 ›› Issue (9) : 79-83.

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Time-frequency analysis of vibration signal of underwater target by underwater explosion between two explosive charges

LI Wan, ZHANG Zhi-hua, LI Qing-min, LI Da-wei

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Abstract

For the experiment data of a underwater target subjected to underwater explosion, the interaction of the shock wave and the bubble pulsation of the explosion in two charges were investigated and the time-frequency characteristic of the structure response being a non-stationary random process was analyzed. The first shock wave, the second and the first pressure pulse were extracted from the signal, and their energy distribution was analyzed and the respective influence of the signal in different period on the target could be assessed. Results from the investigation show that the main frequency components of the first shock wave and the second shock wave are higher than 780Hz which were in a wide frequency range and the second shock wave has the largest energy, and the main frequency components of the first pressure pulse was between 100Hz and 400Hz which may also cause the damage of the underwater structure because the natural frequency of the structure is also in this frequency band.

Key words

underwater explosion / two explosive charges / Hilbert-Huang Transform / shock wave / bubble pulsation

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LI Wan;ZHANG Zhi-hua;LI Qing-min;LI Da-wei. Time-frequency analysis of vibration signal of underwater target by underwater explosion between two explosive charges[J]. Journal of Vibration and Shock, 2013, 32(9): 79-83