超高速撞击声发射信号在加筋壁板中传播的模态转换现象研究

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振动与冲击 ›› 2014, Vol. 33 ›› Issue (21) : 114-118.

论文

超高速撞击声发射信号在加筋壁板中传播的模态转换现象研究

刘治东1，庞宝君1，刘刚2

作者信息 +

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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文章历史 +

摘要

为应对空间碎片对载人密封舱的撞击威胁，一种基于声发射的在轨感知系统被应用于载人密封舱，通过采集撞击产生的声发射信号，感知撞击事件并定位由此产生的气体泄漏源或潜在泄漏源。载人密封舱舱壁通常由周期性加筋板焊接而成，声发射信号在筋体处会发生复杂的散射现象。针对散射现象中的模态转换现象，本文采用数值仿真手段，研究了超高速撞击声发射信号所含各模态板波在筋体处的模态转换特性，结果表明：S0、A0、S2阶板波经过筋体后会分别部分转换为A0、S0、A1阶板波；A1阶板波经过筋体后会部分转换为S0阶板波。

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.

导出引用

刘治东;庞宝君;刘刚. 超高速撞击声发射信号在加筋壁板中传播的模态转换现象研究[J]. 振动与冲击, 2014, 33(21): 114-118

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