El-Kettani M Ech-Cherif, Luppé F, Guillet A
Laboratoire d'Acoustique Ultrasonore et d'Electronique (LAUE), UMR CNRS 6068, Universités du Havre, Place Robert Schuman, BP 4006, 76610 Le Havre, France.
Ultrasonics. 2004 Apr;42(1-9):807-12. doi: 10.1016/j.ultras.2004.01.071.
The aim of this work is to give experimental and numerical results on the behaviour of guided waves that propagate downslope in a free elastic plate with slowly linearly varying thickness. We show experimentally the propagation of adiabatic modes, which are guided waves that adapt to the varying thickness of the plate. As the thickness is decreasing, a given guided wave will reach its thickness cut-off. When this happens, we show that two phenomena occur: the reflection of this wave and its propagation backward in the plate, its conversion into a different guided wave which goes on propagating downslope in the plate. The numerical study is done with the software Ansys, based on the finite element method. The results obtained confirm the experimental ones.
这项工作的目的是给出关于导波在厚度缓慢线性变化的自由弹性板中向下坡传播行为的实验和数值结果。我们通过实验展示了绝热模式的传播，绝热模式是适应板厚度变化的导波。随着厚度减小，给定的导波将达到其厚度截止值。当这种情况发生时，我们表明会出现两种现象：该波的反射及其在板中向后传播，它转换为另一种导波并继续在板中向下坡传播。数值研究是使用基于有限元方法的Ansys软件完成的。获得的结果证实了实验结果。
