单激励主动Lamb波板结构损伤时间反转成像方法仅对面向激励器的损伤侧敏感, 在实施过程中会存在伪损伤点问题, 影响对损伤的正确评估。研究提出扫查合成损伤成像方法, 首先通过扫查的方法轮流选择压电元件进行激励, 从多个角度实现对损伤的照射, 再将扫查得到的信号进行合成成像, 实现对损伤的监测。在铝板结构上的试验结果表明, 该方法可有效消除监测结果的方向敏感性和伪损伤点, 提高损伤成像监测结果的准确性和稳定性。

Active Lamb wave damage time reversal imaging method with single actuator is only sensitive to the direction faced to the actuator. It will bring false damage points and influence the damage evaluation. Scanning synthetic damage imaging method was proposed. Piezoelectric element was selected one by one to act as the actuator. It could illuminate the damage from multi directions. All sensing signals were synthetically used to image and monitor the damage. Experiment on the aluminum plate structure illustrated that the method could not only eliminate the false damage points and directionality, but also improve the veracity and stability.