Understanding a time reversal process in Lamb wave propagation
Understanding a time reversal process in Lamb wave propagation
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DOI：
10.1016/j.wavemoti.2009.04.004
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发表时间：
2009-11-01
期刊：
影响因子：
2.4
通讯作者：
Sohn, Hoon
中科院分区：
文献类型：
--
作者：
Park, Hyun Woo;Kim, Seung Bum;Sohn, Hoon
研究了粘贴在板状结构上的压电换能器发射和接收兰姆波信号的时间反转过程。许多先前的研究已经注意到了空间和时间的重新聚焦能力的原始激发通过TRP在高度色散和复杂的媒体。然而，当TRP被施加到均匀规则波导中的兰姆波时，即使时间反转信号的持续时间增加，由于永久残留边带，重聚焦能力也是有限的。基于弹性动力学和线性压电的相互作用，对时域重构信号的主边带和剩余边带进行了理论解释。特别是，解释包括速度和振幅频散的时间效应，多模式的存在，以及在TRP期间从边界的反射。最后，通过数值计算和实验验证了本文的理论分析结果.对成功实现兰姆波TRP的实际问题也作了简要说明。(C)2009爱思唯尔有限公司版权所有。
This study investigates the time reversal process (TRP) of Lamb wave signals which are transmitted and received by piezoelectric transducers bonded on plate-like structures. A number of previous studies have paid attention to spatial and temporal refocusing capability of an original excitation through the TRP in highly dispersive and complex media. However, when the TRP is applied to Lamb waves in a homogeneous regular waveguide, the refocusing capability is limited due to permanent residual side bands even if the duration of the time reversed signal increases. Based on the reciprocity of elastodynamics and linear piezoelectricity, theoretical interpretation is conducted for the main and residual side bands of the reconstructed signal in the time domain. In particular, the interpretation includes the temporal effect of velocity and amplitude dispersions, the existence of multi-modes, and the reflections from boundaries during the TRP. Then, numerical and experimental tests are conducted to validate the theoretical findings of this paper. Practical issues for the successful implementation of the TRP of Lamb waves are briefly addressed as well. (C) 2009 Elsevier B.V. All rights reserved.