Identification of dual notches based on time-reversal lamb waves and a damage diagnostic imaging algorithm
Identification of dual notches based on time-reversal lamb waves and a damage diagnostic imaging algorithm
复制标题
基于时间反转兰姆波和损伤诊断成像算法的双缺口识别
DOI：
10.1177/1045389x11421821
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发表时间：
2011-11-01
影响因子：
2.7
通讯作者：
Meng, Guang
中科院分区：
文献类型：
--
作者：
Miao, Xiaoting;Wang, Dong;Meng, Guang
将传感器网络的时反兰姆波信号与损伤诊断成像算法相结合，对铝板上的双缺口进行了识别。利用动态有限元分析方法研究了兰姆波在铝板中传播时的时间可逆性。当基本对称（S0）模式单独反转时或者当S0模式和基本反对称（A0）模式都反转时，通过重构波形和原始激活的短纯音的相关性来校准基于时间反转的损伤指数（DI）。仿真结果表明，校准的DI是几乎相同的单一或多个兰姆模式的时间反转。基于兰姆波的时间可逆性，利用损伤诊断成像算法对铝板中的双缺口进行了实验识别。随着时间反演为基础的DI的铝板上的各个传感路径的可用性，双缺口的存在的概率值估计在被检测的传感器网络包围的区域。识别结果表明，集成的方法与时间反演兰姆波和损伤诊断成像算法是独立的额外的基准信号，它可以自信地用于定位多个实例的损伤。
An integration of time-reversal Lamb wave signals from a sensor network and a damage diagnostic imaging algorithm is developed to identify dual notches in an aluminum plate. The time reversibility of Lamb waves for one wave propagation path in an aluminum plate is investigated using dynamic finite element analysis (FEA). A time-reversal-based damage index (DI) is calibrated by correlation of the reconstructed waveform and the original activated tone burst, when the fundamental symmetric (S0) mode alone is reversed or when both the S0 mode and the fundamental antisymmetric (A0) mode are reversed. Simulation results demonstrate that the calibrated DI is almost identical for the time reversal of single or multiple Lamb modes. On the basis of the time reversibility of Lamb waves, dual notches in an aluminum plate are identified using the damage diagnostic imaging algorithm in the experiment. With the availability of time-reversal-based DI for individual sensing paths on the aluminum plate, the probability values for the presence of dual notches are estimated in the inspected area enclosed by the sensor network. Identification results demonstrate that the integrated approach with time-reversal Lamb waves and the damage diagnostic imaging algorithm is independent of additional benchmark signals, and it can be used confidently to locate multiple instances of damage.