基于混频Lamb波的闭合裂纹定位方法仿真  

Simulation of Closed-Crack Location Method Based on Mixed Lamb Wave

作　　者：孟佳颖 郑慧峰 凌田昊 赵娜[2] MENG Jia-ying;ZHENG Hui-feng;LING Tian-hao;ZHAO Na(Institute of Precision Measurement and Control,China Jiliang University,Hangzhou Zhejiang 310018,China;China Special Equipment Inspection&Research Institute,Beijing 100029,China)

机构地区：[1]中国计量大学计量测试工程学院,浙江杭州310018 [2]中国特种设备检测研究院,北京100029

出　　处：《计算机仿真》2023年第4期520-525,共6页Computer Simulation

基　　金：国家重点研发计划资助(2017YFF0205004);浙江省自然科学基金(LY17E050015、LQ20A040007);浙江省质量技术监督系统科研计划项目(20180103);浙江省大学生科研创新团队资助项目(2021R409036)。

摘　　要：为了对金属板构件中存在的早期闭合裂纹损伤进行无损检测和评价,提出一种将非线性混频方式与超声Lamb波技术相结合的检测技术。通过基本原理分析,推导了混频Lamb波对应的非线性评价参量,用于对闭合裂纹损伤进行评价,提出一种线扫查的闭合裂纹定位方法确定其在板中的位置,利用有限元仿真软件验证了混频信号的生成,利用非线性系数确定有效检测范围,并应用混频Lamb波对铝板中闭合裂纹进行了检测、表征与定位。仿真结果表明,混频信号的幅值随闭合裂纹的长度增加而增加,随闭合裂纹的宽度增加而减小,可认为混频信号对于闭合裂纹有足够的敏感性,能够对闭合裂纹进行检测与评价。In order to carry out non-destructive testing and evaluation of the early closed-crack defect in the metal plate components,this paper proposes a detection technology that combines the nonlinear frequency mixing method with the ultrasonic Lamb wave technology.First,through the analysis of basic principles,the nonlinear evaluation parameter corresponding to the mixed Lamb wave technique was derived to evaluate the damage degree of the closedcrack,and then a line scanning method was proposed to locate the closed-crack in the plate.Finally,finite element simulation software was used to verify the generation of mixed signal,and nonlinear coefficient was used to determine the effective detection area.The mixed Lamb wave technique was used to detect,characterize and locate the closedcrack in the aluminum plate.The simulation results show that the amplitude of the mixed signal increases with the increase of the length of closed-crack,and decreases with the increase of the width of closed-crack.It can be considered that the mixed signal has sufficient sensitivity to the closed-crack and can detect and evaluate the closed-crack.

关 键 词：非线性超声 闭合裂纹 混频兰姆波 无损检测 非线性系数 

分 类 号：TB559[理学—物理]