文献类型：期刊文献

英文题名：Nonlinear Lamb wave phased array for revealing micro-damage based on the second harmonic reconstruction

作者：Xu, Haiming[1];Liu, Lishuai[1];Li, Xuan[1];Peng, Siyuan[1];Xiang, Yanxun[1];Xuan, Fu-Zhen[1]

机构：[1]East China Univ Sci & Technol, Sch Mech & Power Engn, Shanghai Key Lab Intelligent Sensing & Detect Tech, Shanghai 200237, Peoples R China

年份：2024

卷号：220

外文期刊名：MECHANICAL SYSTEMS AND SIGNAL PROCESSING

收录：;EI(收录号：20242716605935);WOS:【SCI-EXPANDED(收录号:WOS:001264837700001)】；

基金：This work was supported by the National Natural Science Foundation of China (Grant Nos. 12025403, 12327807, 12104155, and 12374434) and the Basic Research Program of Shanghai Science and Technology Innovation Action Plan (Grant No. 23JC1401600) .

语种：英文

外文关键词：Nonlinear phased array imaging; Lamb waves; Closed fatigue crack; Second harmonic; Sparse representation

摘要：It is challenging but meaningful to detect and image the micro-damage in the early stages of engineering structure failure. The nonlinear ultrasonic technique has gained considerable attention for micro-damage detection, meanwhile, the Lamb wave phased array technique has become a practical tool for macro-damage imaging. The combination of these two techniques can pave a promising way for micro-damage imaging in plate-like structures. However, the research on nonlinear Lamb wave phased array imaging is complicated and not reported. The weak nature and hard extraction of the nonlinear features, such as the second harmonic generation, limits the application of the nonlinear Lamb wave phased array. A framework of nonlinear Lamb wave phased array for micro-damage imaging in the plate-like structure is developed. To maximize the second harmonic response of the recorded Lamb waves, two kinds of lead zirconate titanate (PZT) wafers are selected to compose the nonlinear phased array. Furthermore, focusing on the nonlinear feature extraction, the sparse representation approach is introduced for reconstructing the time-domain second harmonic generated by the micro-damage, from which a wealth of waveform information corresponding to the micro-damage can be extracted. The total focusing method (TFM) is used for micro-damage imaging based on the reconstructed second harmonic. Numerical simulation and experimental validation demonstrate the capability of the proposed framework to image the local contact acoustic nonlinearity represented by the barely visible closed fatigue crack with the nonlinear Lamb wave phased array.