高速撞击声发射信号在铝板中的衰减规律  

Attenuation of Acoustic Emission Signals from Hypervelocity Impact on Al Paltes

作　　者：刘武刚[1] 王建民[1] 顾海贝[1] 于荣刚[1] 庞宝君[2] 

机构地区：[1]北京强度环境研究所可靠性与环境工程技术重点实验室,北京100076 [2]哈尔滨工业大学空间碎片高速撞击中心,哈尔滨150080

出　　处：《无损检测》2012年第12期41-45,共5页Nondestructive Testing

基　　金：空间碎片专项基金资助项目(K0203210)

摘　　要：高速撞击声发射信号传播至传感器并被转换成电信号的过程中会发生信号幅值的衰减,导致信号在损伤评估和源定位的误差增大。分析了衰减产生的原因,得到了衰减的一般规律。为了分析高速撞击声发射信号中不同频率板波模态的衰减规律,将高速撞击数值模拟声发射信号进行了小波信号高频和低频的重构并分别进行衰减规律的研究,得到了此两种频率在铝板中的衰减规律,研究了衰减系数和"等效幅值"随撞击速度的变化规律,研究结果可以用于撞击源定位传感器布局优化及损伤程度评估等领域。Attenuation of acoustic emission signal occurs during its transmission to sensors on the aluminum plate. This would bring errors in damage evaluation and source location. In this paper, cause and rules of attenuation are analyzed and attained. In order to analyze the attenuation rules of waves in different frequency, the simulated acoustic emission signals from hypervelocity impact are reconstructed in higher and lower frequency, and their attenuation rules are analyzed separately. Their attenuation rules transmitting on aluminum plate are attained. In addition, rules of auenuation ratio and equivalent amplitude changing with impact velocity are analyzed as well. The results could have some applications in optimization of sensor array and damage evaluation.

关 键 词：空间碎片 高速撞击 信号衰减 声发射 

分 类 号：TG115.28[金属学及工艺—物理冶金]