Analysis of Hypervelocity Impact Induced AE Wave Mode Conversionin a Plate with Vertical Stiffener

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Journal of Vibration and Shock ›› 2014, Vol. 33 ›› Issue (21) : 114-118.

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Analysis of Hypervelocity Impact Induced AE Wave Mode Conversionin a Plate with Vertical Stiffener

LIU Zhi-dong1, PANG Baojun1, LIU Gang2

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Abstract

To response the impacting threats from orbital debris, an onboard monitoring system based on acoustic emission (AE) technique is presented to manned pressurized cabin for detecting the impact events by capture the hypervelocity AE signals propagate in the module wall. Usually the module wall is made by welding from integral stiffened shell structures, AE signals will cross stiffeners during the propagation leads to reflection, transmission and mode conversion. In this paper, numerical simulation is adopted to study the mode conversion characteristic of AE signal. The results indicated that: after passing through a stiffener, a portion of S0, A0, S2 mode converts to A0, S0, A1; A1 mode will partially convert to S0.

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mode conversion / acoustic emission waveform / hypervelocity impact / manned pressurized cabin

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LIU Zhi-dong;PANG Baojun;LIU Gang. Analysis of Hypervelocity Impact Induced AE Wave Mode Conversionin a Plate with Vertical Stiffener[J]. Journal of Vibration and Shock, 2014, 33(21): 114-118