时间反转处理对Lamb波频散效应补偿分析

Dispersive Compensation of Time Reversal Process to Lamb Wave

对基于时间反转理论的Lamb波频散效应补偿进行研究,采用信号与系统理论描述Lamb波信号时间反转聚焦原理和过程,并对聚焦信号中各组成部分的频散补偿效果进行分析和实验验证。

Lamb wave monitoring technique is one of the research focuses of structural health monitoring （SHM）. Due to the multi-mode and dispersion effects of Lamb wave, the analysis and processing of the monito- ring signals were usually complicated. Research on dispersive compensation to Lamb wave was carried out based on time reversal theory. The principle and process of the Lamb wave time reversal focalization were given by signal and system theory. Effects of the dispersive compensation to the parts of the focalized signal were ana- lyzed and experimentally validated. The experimental results shown that time reversal process could compensate the dispersion of the multi-mode Lamb waves partly.