Enhancement of Guided Wave Detection and Measurement in Buried Layers of Multilayered Structures Using a New Design of V(z) Acoustic Transducers

被引:1
|
作者
Lematre, Michael [1 ]
Lethiecq, Marc [1 ]
机构
[1] Univ Tours, INSA Ctr Val Loire, GREMAN, CNRS, F-41000 Blois, France
来源
ACOUSTICS | 2022年 / 4卷 / 04期
关键词
V(z) acoustic signature; piezoelectric transducers; multilayer structures; guided waves; ANISOTROPIC-LAYER; ADHESIVE BONDS; PROPAGATION; PARAMETERS; CURVES; PLATE; INTERFACES; SCATTERING; COATINGS;
D O I
10.3390/acoustics4040061
中图分类号
O42 [声学];
学科分类号
070206 ; 082403 ;
摘要
This paper presents the possibility of enhancement of the generation and detection of poorly energetic acoustic-guided waves in multilayered structures using a new design for a V(z) transducer. By defining a modified V(z) transducer composed of segmented piezoelectric elements, the acoustical energy can be directed towards specific angles in such a way as to generate guided waves that are poorly energetic. By comparing the results using this new design to those obtained with a classical V(z) transducer, it is shown that the generation and detection of such waves is greatly improved, especially for poorly energetic waves that belong to a buried layer in a multilayered structure. This is especially seen on the components of the spectra of V(z). The modeling of the modified V(z) signature for a multi-element focused transducer is widely detailed first. Then, in order to illustrate the advantages of our proposed method, a three-layer structure (aluminum/epoxy/steel) is discussed. The interest of this method for the characterization of elastic properties of "buried" layers through specific guided waves that are detected with great difficulty-or even not at all-with a classical V(z) transducer is demonstrated, especially for the A(0) and S-0 modes corresponding to the steel layer inside the three-layer structure. In this study, we also develop a specific tracking method for particular guided waves possessing large phase velocity variations over the considered frequency range, as is the case for the S-0 mode of the steel sub-layer.
引用
收藏
页码:996 / 1012
页数:17
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