Focusing of Time Reversal Lamb Waves and Its Applications in Structural Health Monitoring
Focusing of Time Reversal Lamb Waves and Its Applications in Structural Health Monitoring
复制标题
时间反转兰姆波聚焦及其在结构健康监测中的应用
DOI：
10.1088/0256-307x/27/10/104301
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发表时间：
2010-10-01
影响因子：
3.5
通讯作者：
Yu Jian-Bo
中科院分区：
文献类型：
--
作者：
Zhang Hai-Yan;Chen Xian-Hua;Yu Jian-Bo
对色散多模态兰姆波时反转声场的聚焦进行了理论研究和实验验证。结果表明，当测点位于损伤位置时，时间反转兰姆波信号的幅值最大。基于时间反转聚焦理论，提出了一种利用兰姆波进行结构健康监测的损伤成像方法。实验采用一个由四个压电换能器组成的换能器网络作为执行器，以及传感器来激发和测量兰姆波。结果表明，该方法能够准确地预测损伤位置，并提供了可能区域的估计，即使是靠近其中一个传感器或稍微超出传感器网络的损伤。
The focusing of time reversal acoustic fields for dispersive and multimodal Lamb waves is theoretically investigated and experimentally verified. It is demonstrated that the time reversal Lamb wave signal will reach the maximum amplitude when the observation point is located at the damage location. Based on the time reversal focusing theory, a damage imaging method is proposed for structural health monitoring using Lamb waves. The experiments employ a transducer network consisting of four piezoelectric transducers as actuators and as well sensors for excitation and measurement of Lamb waves. The results show that this method is able to accurately predict damage location and provides an estimation of the possible area even for damage close to one of the transducers or even slightly outside the transducer network.