Moulin Emmanuel, Grondel Sébastien, Assaad Jamal, Duquenne Laurent
OAE Department, IEMN, UMR CNRS 8520, Universite de Valenciennes et du Hainaut Cambresis, Le Mont Houy, Valenciennes Cedex 9, France.
J Acoust Soc Am. 2008 Dec;124(6):3521-7. doi: 10.1121/1.2996337.
The work described in this paper is intended to present a simple and efficient way of modeling a full Lamb wave emission and reception system. The emitter behavior and the Lamb wave generation are predicted using a two-dimensional (2D) hybrid finite element-normal mode expansion model. Then the receiver electrical response is obtained from a finite element computation with prescribed displacements. A numerical correction is applied to the 2D results in order to account for the in-plane radiation divergence caused by the finite length of the emitter. The advantage of this modular approach is that realistic configurations can be simulated without performing cumbersome modeling and time-consuming computations. It also provides insight into the physical interpretation of the results. A good agreement is obtained between predicted and measured signals. The range of application of the method is discussed.
本文所述工作旨在提出一种简单高效的方法，用于对全兰姆波发射和接收系统进行建模。使用二维（2D）混合有限元-简正模式展开模型预测发射器行为和兰姆波产生。然后通过具有规定位移的有限元计算获得接收器的电响应。对二维结果应用数值校正，以考虑由发射器有限长度引起的面内辐射发散。这种模块化方法的优点是可以模拟实际配置，而无需进行繁琐的建模和耗时的计算。它还能深入了解结果的物理解释。预测信号与测量信号之间取得了良好的一致性。讨论了该方法的应用范围。
