中文摘要：

借鉴在地球物理学等领域成功应用的偏移技术，提出了一种应用散射Lamb波对板结构中多部位损伤进行实时识别的方法。基于Mindlin板理论，首次推导了板结构中弥散性弯曲波频率-波数域的快速偏移方法。结合爆炸成像原理，采用零炮检距散射波信号对损伤进行成像识别。数值仿真研究表明本文提出方法不仅能够识别多部位损伤的位置，还具有识别损伤程度的潜力，其快速计算的优点满足在线结构健康监测系统对实时性的要求。

英文摘要：

Structural health monitoring is one of the most promising research areas in the fields of smart materials and structures. This paper proposes an approach for identification of multiple damages in plate-like structure in real time using scattered Lamb waves, which is successfully used in the fields of geophysics. Based on Mindlin plate theory, the fast frequency- wavenumber domain migration technique for dispersive flexural wave is deduced for the first time. Combined with the exploding imaging condition, damages are imaged by using zero-offset scatter wave signals. Numerical simulation study demonstrates that the proposed method has the capability of not only localizing multiple damages but also having the potential of identifying their extent, its advantage of fast calculation meets the requirement of real-time damage identification for an on-line structural health monitoring system.