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Title: Characterization and design improvement of a thickness-shear lead zirconate titanate transducer for low frequency ultrasonic guided wave applications
Authors: Zennaro, Marco
O'Boy, D.J.
Lowe, Premesh S.
Gan, Tat-Hean
Keywords: Ultrasonic guided waves testing
Mode purity
Non-destructive testing
Numerical simulations
Sensor development
Thickness shear transducers
Issue Date: 2019
Publisher: MDPI AG © The Authors
Citation: ZENNARO, M. ... et al, 2019. Characterization and design improvement of a thickness-shear lead zirconate titanate transducer for low frequency ultrasonic guided wave applications. Sensors, 19 (8), 1848.
Abstract: Thickness-shear transducers for guided wave testing have been used in industry for over two decades and much research has been conducted to improve the resolution and sensitivity. Due to a geometric feature of the current state-of-the art transducer, there is an out-of-plane component in the propagation direction of the fundamental shear horizontal mode which complicates the signal interpretation. In such case, complex signal processing techniques need to be used for mode discrimination to assess the structural health with higher precision. Therefore, it is important to revise the transducer design to eliminate the out-of-plane components in the propagation direction of fundamental shear horizontal mode. This will enhance the mode purity of fundamental shear horizontal mode for its application in guided wave inspection. A numerical investigation has been conducted on a 3 mm thick 2 m circular steel plate to understand the behaviour and the characteristics of the state-of-the-art thickness-shear transducer. Based on the results, it is noted that the redesigning the electrode arrangement will suppress the out-of-plane components on the propagation direction of the fundamental shear horizontal mode. With the aid of this information current state-of-the-art transducers were redesigned and tested in laboratory conditions using the 3D Laser Doppler Vibrometer. This information will aid future transducer designers improve the resolution of thickness-shear transducers for guided wave applications and reduce the weight and cost of transducer array by eliminating the need of additional transducers to suppress spurious modes.
Description: This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
Sponsor: This research was funded by Lloyd’s Registered Foundation and Loughborough University, grant number [30335], and the APC was funded by Loughborough University and Brunel Innovation Centre.
Version: Published
DOI: 10.3390/s19081848
URI: https://dspace.lboro.ac.uk/2134/37622
Publisher Link: https://doi.org/10.3390/s19081848
ISSN: 1424-8220
Appears in Collections:Published Articles (Aeronautical and Automotive Engineering)

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