粘弹性材料板中缺陷反射的导波的反射系数和透射系数。

Reflection and transmission coefficients for guided waves reflected by defects in viscoelastic material plates.

作者信息

Hosten Bernard, Moreau Ludovic, Castaings Michel

机构信息

Laboratoire de Mécanique Physique, Université Bordeaux 1, UMR C.N.R.S. 5469 351 cours de la Libération, 33405 Talence Cedex, France.

出版信息

J Acoust Soc Am. 2007 Jun;121(6):3409-17. doi: 10.1121/1.2723652.

DOI:10.1121/1.2723652

PMID:17552692

Abstract

The paper presents a Fourier transform-based signal processing procedure for quantifying the reflection and transmission coefficients and mode conversion of guided waves diffracted by defects in plates made of viscoelastic materials. The case of the S(0) Lamb wave mode incident on a notch in a Perspex plate is considered. The procedure is applied to numerical data produced by a finite element code that simulates the propagation of attenuated guided modes and their diffraction by the notch, including mode conversion. Its validity and precision are checked by the way of the energy balance computation and by comparison with results obtained using an orthogonality relation-based processing method.

摘要

本文提出了一种基于傅里叶变换的信号处理方法，用于量化粘弹性材料制成的板中缺陷所衍射的导波的反射系数、透射系数和模式转换。考虑了S(0)兰姆波模式入射到有机玻璃平板中的一个缺口上的情况。该方法应用于由有限元代码生成的数值数据，该代码模拟了衰减导模的传播及其被缺口的衍射，包括模式转换。通过能量平衡计算以及与使用基于正交关系的处理方法获得的结果进行比较，检验了该方法的有效性和精度。