基于Lamb波时间反转的复合材料结构损伤监测

Damage Detection for Composites Based on Time Reversal Lamb Waves Method

采用Lamb波时间反转法,对复合材料结构进行在线连续健康监测。利用板中Lamb波时间反转法的原理和自聚焦特点,运用时间反转方法,通过传感器网络的布置,激励并接收Lamb波,从而对复合材料结构实现损伤监测。该方法无需结构无损情况的基准信号,能够对有损结构进行快速的损伤定位及损伤大小判断。采用改进的RAPID算法进行损伤成像,得到的损伤图像可将损伤情况可视化。实验研究表明所提方法可行和有效。

An online damage detection and identification method was presented using time reversal Lamb waves method for continuously monitoring of CFRP composites. The principles and characteris tics of the time reversal Lamb waves in a composite plate were introduced firstly. Then the time rever sal method was adapted to detect the local defects in composite plate structures, by using an active sensing system mounted on a composite plate to excite and receive Lamb waves. This method can i- dentify the location and size of the damage in a composite plate quickly without relying on past base- line date. The image that indicates the damage can be obtained by the RAPID algorithm. Experimental results demonstrate the applicability and effectiveness of the proposed method.