Signal processing for damage detection using two different array transducers

被引:17
作者
El Youbi, F [1 ]
Grondel, S [1 ]
Assaad, J [1 ]
机构
[1] Univ Valenciennes & Hainaut Cambresis, Dept OAE, IEMN, CNRS,UMR 8520, F-59313 Valenciennes 9, France
关键词
lamb waves; multi-element transducers; 2D-FT; damage detection;
D O I
10.1016/j.ultras.2004.01.070
中图分类号
O42 [声学];
学科分类号
070206 ; 082403 ;
摘要
This work describes an investigation into the development of a new health monitoring system for aeronautical applications. The health monitoring system is based on the emission and reception of Lamb waves by multi-element piezoelectric transducers (i.e., arrays) bonded to the structure. The emitter array consists of three different elementary bar transducers. These transducers have the same thickness and length but different widths. The receiver array has 32 same elements. This system offers the possibility to understand the nature of the generated waves and to determine the sensitivity of each mode to possible damage. It presents two principal advantages: Firstly, by exciting all elements in phase, it is possible to generate several Lamb modes in the same time. Secondly, the two-dimensional fourier transform (2D-FT) of the received signal can be easily computed. Experimental results concerning an aluminum plate with different hole sizes will be shown. The A0-, S0-, A1- S1- and S2-modes are generated at the same time. This study shows that the A0 mode seems particularly interesting to detect flaws of this geometrical type. (C) 2004 Elsevier B.V. All rights reserved.
引用
收藏
页码:803 / 806
页数:4
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