基于小波分析技术的高速撞击声发射源定位  

Acoustic emission detection and location for hypervelocity impacts based on wavelet transform

作　　者：刘武刚[1,2] 庞宝君[1] 韩增尧[3] 孙飞[1,2] 

机构地区：[1]哈尔滨工业大学哈尔滨150080 [2]北京强度环境研究所北京100076 [3]中国空间技术研究院北京100094

出　　处：《高技术通讯》2009年第2期181-187,共7页Chinese High Technology Letters

基　　金：空间碎片专项基金(KJSP2005-0206,07202)资助项目

摘　　要：针对在轨航天器遭受空间碎片撞击损伤的定位问题,利用二级轻气炮发射铝弹丸撞击铝板来模拟空间碎片对航天器结构的损伤;通过声发射传感器实时记录结构中的时域波形信号,结合板波的频散特性,分析了高速撞击穿孔损伤时波动在铝板中的传播模式。基于小波时频分析技术研究了高速撞击损伤的定位问题,分析了波速对定位精度的影响。结果表明,基于小波分析技术的高速撞击声发射源定位能够满足撞击损伤的定位要求,为解决航天器在轨遭受空间碎片撞击的损伤定位提供了一种新的方法。The study on location of hypervelocity impacts of space debris on a spacecraft was conducted as follows： a two-stage light gun was used to fire spherical aluminum balls with different diameters at various impact velocities to aluminum panels, which more closely simulated the damages caused by hypervelocity impacts of micrometeoroids and space debris on spacecraft. The acoustic waves propagating modes emission （AE） impact signals in the plates were presented were recorded by an under the impact crater oscillograph The impact with AE sensors. The Lamb locations were computed with the algorithm of triangle sensor arrangement based on the Gabor wavelet transform. The affect of the wave velocity on location accuracy was discussed. The results show that the impact location based on the wavelet transform can provide a satisfied accuracy. This algorithm can effectively locate the impact point on in-orbit spacecraft.

关 键 词：空间碎片 声发射 高速撞击 源定位 小波分析 

分 类 号：V416[航空宇航科学与技术—航空宇航推进理论与工程]