文献类型：期刊文献

英文题名：A Novel Baseline-Free Method for Damage Localization Using Guided Waves Based on Hyperbola Imaging Algorithm

作者：Xu, Jichao[1];Zhu, Wujun[1];Qiu, Xunlin[1];Xiang, Yanxun[1]

机构：[1]East China Univ Sci & Technol, Sch Mech & Power Engn, Key Lab Safety Sci Pressurized Syst MOE, Shanghai 200237, Peoples R China

年份：2023

卷号：23

期号：4

外文期刊名：SENSORS

收录：;EI(收录号：20231013669577);WOS:【SCI-EXPANDED(收录号:WOS:000941803200001)】；

基金：This work was supported by the National Key Research and Development Program of China (2021YFC3001802) and the National Natural Science Foundation of China (Grant Nos. 12025403, U1930202, 12004114 and 12174102).

语种：英文

外文关键词：Lamb waves; baseline-free; hyperbola; cross-correlation; damage localization

摘要：Most imaging methods based on ultrasonic Lamb waves in structural health monitoring requires reference signals, recorded in the intact state. This paper focuses on a novel baseline-free method for damage localization using Lamb waves based on a hyperbolic algorithm. This method employs a special array with a relatively small number of transducers and only one branch of the hyperbola. The novel symmetrical array was arranged on plate structures to eliminate the direct waves. The time difference between the received signals at symmetrical sensors was obtained from the damage-scattered waves. The sequence of time difference for constructing the hyperbolic trajectory was calculated by the cross-correlation method. Numerical simulation and experimental measurements were implemented on an aluminum plate with a through-thickness hole in the current state. The imaging results show that both the damages outside and inside the diamond-shaped arrays can be localized, and the positioning error reaches the maximum for the diamond-shaped array with the minimum size. The results indicate that the position of the through-hole in the aluminum plate can be identified and localized by the proposed baseline-free method.