基于全矩阵椭圆成像法的加筋板结构损伤检测  

An elliptical damage detection method using full matrix capture for stiffened plate

作　　者：章盟 樊程广 余孙全 ZHANG Meng;FAN Chengguang;YU Sunquan(College of Aerospace Science and Engineering,National University of Defense Technology,Changsha 410073,China)

机构地区：[1]国防科技大学空天科学学院,长沙410073

出　　处：《北京航空航天大学学报》2024年第6期2033-2042,共10页Journal of Beijing University of Aeronautics and Astronautics

基　　金：国家自然科学基金(61601489);国防科技大学高层次创新人才培养计划。

摘　　要：对航天器结构进行损伤检测对于保障航天器的可靠运行十分重要。Lamb波声学定位是一种常用的损伤检测方法,但在航天器常用的加筋板结构中,加强筋会对板中Lamb波的传播产生反射、透射、延迟叠加等效应,导致常用检测方法的效果大打折扣。为此,提出一种基于全矩阵采样和模型补偿的超声Lamb波的全矩阵椭圆成像定位方法。将全矩阵采样方法引入椭圆成像定位中,通过聚焦的方式,减小加强筋对信号的衰减和干扰所产生的误差。针对Lamb波在加强筋结构中绕筋和直达两种传播特征,提出了一种绕筋补偿策略,消除加强筋的延迟叠加影响。实验表明,全矩阵椭圆成像法能够实现损伤信号的聚焦,提高损伤定位的精度,引入绕筋补偿策略后,实现加筋板的准确损伤定位。Damage detection on spacecraft structures is crucial for ensuring the reliability of the spacecraft.Acoustic localization based on Lamb waves is a common method for damage detection.However,the existence of stiffeners,which are commonly used in spacecraft structures,will produce reflection,transmission,and superposition on the propagation of the Lamb waves in the plate,making it bad or even impossible to detect the damage in the stiffened structure using the general method.I This study presents an approach to precisely localize damage in stiffened plates using whole matrix elliptical image localization,which is based on complete matrix capture and model correction.The full matrix capture method is introduced into elliptic imaging localization for focusing,thereby mitigating errors arising from signal attenuation and interference attributed to stiffeners.Considering the wave propagation around and directly,an arrival time compensation strategy is proposed for eliminating the delayed superposition effects of stiffeners on Lamb waves.The full-matrix elliptical imaging method is effective in improving damage signal focussing,as demonstrated by experiments on both flat and stiffened plates.The arrival time compensation model could be used to obtain precise damage localization.

关 键 词：LAMB波 椭圆成像 小波变换 加筋板 结构健康监测 

分 类 号：TG115.28[金属学及工艺—物理冶金]