基于Lamb波与虚拟时间反转的延时叠加成像算法  

Time delay overlay imaging algorithm based on Lamb waves and virtual time reversal

作　　者：王高平[1] 关可庆 陈云 李致远 WANG Gaoping;GUAN Keqing;CHEN Yun;LI Zhiyuan(School of Mechanical and Electrical Engineering,Wuhan Institute of Technology,Wuhan 430205,China)

机构地区：[1]武汉工程大学机电工程学院,武汉430205

出　　处：《无损检测》2024年第1期44-50,67,共8页Nondestructive Testing

基　　金：武汉工程大学第十四届研究生教育创新基金资助项目(CX2022098);湖北省自然科学基金资助项目(2013CFB321)。

摘　　要：针对传统的延时叠加成像容易产生伪像而导致缺陷不易识别且成像清晰度差的问题,提出采用虚拟时间反转技术与椭圆定位法初步定位损伤区域,进而在对应的时间窗内截取差信号,最后结合延时叠加成像技术解决了伪像和清晰度问题。以ABAQUS软件仿真的方式模拟Lamb波在损伤铝板中的传播过程,首先利用虚拟时间反转法对初次响应信号进行处理而获得聚焦重构信号,然后利用准确的时间延时作椭圆以初步定位范围,从而得到对应的时间窗来截取差信号,最后结合延时叠加成像技术对损伤进行成像。仿真和试验结果表明:该方法降低了操作难度,提高了成像清晰度,能准确有效地识别损伤位置,提高了铝板的损伤定位检测精度。In order to solve the problem that the traditional time-delay superposition imaging is easy to produce artifacts,which leads to the defects not easy to be identified and the imaging resolution is poor,the virtual time reversal technology and elliptic positioning method were proposed to initially locate the damaged area.Then the difference signal was intercepted in the corresponding time window.Finally,the problem of artifacts and resolution was solved by combining the time-delay superposition imaging.In this paper,ABAQUS software was used to simulate the propagation process of Lamb waves in damaged aluminum plate.Firstly,virtual time reversal method was used to obtain the focused reconstruction signal of the initial response signal,and then the accurate time delay was used to make the initial positioning range of the ellipse.Therefore,the corresponding time window was obtained to intercept the difference signal.Finally,the damage was imaged by using the time-delay overlay imaging technology.The simulation and experimental results showed that this method reduced the difficulty of operation,improved the imaging clarity,which can identify the damage location accurately and effectively.It improved the damage location detection accuracy of aluminum plate.

关 键 词：兰姆波 时间反转 铝板 损伤成像 

分 类 号：V252.2[一般工业技术—材料科学与工程] TQ174.75[航空宇航科学与技术—航空宇航制造工程] TG115.28[化学工程—陶瓷工业]