An omnidirectional shear horizontal wave transducer based on thickness-mode (d33) piezoelectric wafer active sensors

Yiran Tian; Yanfeng Shen; Zhaofei Shang

doi:10.1117/12.2582291

22 March 2021 An omnidirectional shear horizontal wave transducer based on thickness-mode (d₃₃) piezoelectric wafer active sensors

Yiran Tian, Yanfeng Shen, Zhaofei Shang

Author Affiliations +

Proceedings Volume 11593, Health Monitoring of Structural and Biological Systems XV; 115930E (2021) https://doi.org/10.1117/12.2582291
Event: SPIE Smart Structures + Nondestructive Evaluation, 2021, Online Only

Abstract

In this study, an omnidirectional shear horizontal (SH) wave acoustic transducer (OSH-WAT) is proposed, composed of a circular aluminum structure driven by twelve thickness-mode (d₃₃) piezoelectric wafer active sensors (PWAS). The OSH-WAT contains six units to form an axisymmetric structure, and each unit consists of a cylinder with a cantilever beam and two cubic stubs. Two d₃₃ PWASs acting like a couple, as the actuation sources, are bonded on the opposite sides of the cantilever beam to drive the excitation. The thickness-mode PWASs can produce a forcing pair, which can be converted to a circumferential shear deformation by two adjacent cubic stubs, contributing to the omnidirectional SH₀ wave generation. Multiphysics finite element model (FEM) is constructed based on such a design. Harmonic analysis is conducted to obtain the spectral response of a circular aluminum plate to investigate the omni-directivity of the SH₀ wave excited by the OSH-WAT, so as to identify the “sweet” frequency bands. Thereafter, the coupled field transient dynamic FEM simulations are carried out to acquire the dynamic response of a pitch-catch active sensing procedure. A voltage signal in the form of a 5-count tone burst is applied on each d₃₃-type PWAS to generate SH0 mode waves into the aluminum host plate. The received signals demonstrate the outstanding performance of the successful generation and reception of SH₀ waves. The proposed OSH-WAT may possess great potential in future Structural Health Monitoring (SHM) and Nondestructive Evaluation (NDE) applications. The paper finishes with summary, concluding remarks, and suggestions for future work.

Conference Presentation

Citation Download Citation

Yiran Tian, Yanfeng Shen, and Zhaofei Shang "An omnidirectional shear horizontal wave transducer based on thickness-mode (d₃₃) piezoelectric wafer active sensors", Proc. SPIE 11593, Health Monitoring of Structural and Biological Systems XV, 115930E (22 March 2021); https://doi.org/10.1117/12.2582291

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