基于改进双到达时差法的无参考损伤定位数值与实验研究

Numerical and Experimental Research on Non-Reference Damage Localization Based on the Improved Two-Arrival-Time Difference Method.

机构信息

College of Aeronautical Engineering, Civil Aviation University of China, Tianjin 300300, China.

College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China.

出版信息

Sensors (Basel). 2022 Nov 2;22(21):8432. doi: 10.3390/s22218432.

DOI:10.3390/s22218432

PMID:36366131

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9657559/

Abstract

The identification of damage based on Lamb waves can hardly avoid obtaining the reference signal under healthy conditions. A non-reference damage localization (NRDL) method is proposed in this paper. The NRDL method is established by the improved two-arrival-time difference method (2/ATDM) and BFGS method. The layout principles of the piezoelectric ceramic lead zirconate titanate (PZT) transducer array in the specimen are proposed. In contrast to existing methods, the damage outside the array in the specimen is identified based on the NRDL. The full-area damage location in the specimen is realized. Furthermore, the optimization of the excitation signal center frequency and transducer array layout is carried out. The damage location accuracy is greatly improved.

摘要

基于兰姆波的损伤识别很难避免获取健康状态下的参考信号。本文提出了一种无参考损伤定位（NRDL）方法。该方法基于改进的双到达时差法（2/ATDM）和 BFGS 法建立。本文提出了在试件中压电陶瓷锆钛酸铅（PZT）换能器阵列的布置原则。与现有方法不同，该方法基于 NRDL 识别试件中阵列外的损伤，实现了试件的全场损伤定位。此外，还对激励信号中心频率和换能器阵列布局进行了优化，极大地提高了损伤定位精度。