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基于虚拟时间反转的高分辨率复合材料板结构损伤成像

, PP. 183-189

Keywords: 复合材料,Lamb波,时间反转,损伤成像,分辨率

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Abstract:

针对传统时间反转(TR)方法消除Lamb波传播时间和操作复杂的问题,提出了虚拟时间反转(VTR)方法。该方法采用换元激励和接收机制以保留时间信息,并运用信号运算代替物理TR操作。讨论了基于阶跃激励获取损伤监测路径传递函数的VTR实现过程。提出了基于VTR的高分辨率损伤成像方法。为了降低复合材料各向异性的影响,在成像中进行了速度修正。实验结果表明,VTR方法能对碳纤维复合材料板中的Lamb波损伤散射波包进行部分再压缩和TR聚焦,通过本文中成像方法也能清晰显示出板中单个和两个近邻损伤。

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