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An investigation of ultrasonic transducer loading on a workpiece

conference contribution
posted on 2018-09-06, 13:06 authored by Marco Zennaro, Alex Haig, Daniel O'BoyDaniel O'Boy, Stephen J. Walsh
Arrays of dry-coupled thickness-shear transducers are often employed in the guided wave sector to inspect pipelines and plate-like structure. The dry coupling permits to dismiss any coupling material between the transducer and the waveguide, but as a drawback a preload must be applied on the transducers to guarantee an effective coupling between the two surfaces. Although the influence of the preload on the natural frequencies is studied in the literature, the frequency response function of a transducer relating the input voltage to the displacement output is not present in the literature. Moreover, the distribution of force on the backing mass and the effect of the preload on the uniformity of vibration of the transducers are still missing. A natural frequency analysis and a forced analysis are then computed numerically with finite element analysis to quantify the influence of the preload on a thickness-shear transducer. Furthermore, these results are compared with experimental results obtained with a Laser Vibrometer. It is then shown how the geometrical layout of the transducer coupled with the preload influences the vibration of the transducer.

Funding

The corresponding author would like to acknowledge the financial support of Loughborough University and the Lloyd’s Registered Foundation.

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Aeronautical and Automotive Engineering

Published in

47th International Congress and Exposition on Noise Control Engineering, Internoise 2018

Citation

ZENNARO, M. ... et al., 2018. An investigation of ultrasonic transducer loading on a workpiece. IN: Proceedings of the 2018 ASME International Conference and Exposition on Noise Control Engineering (NCAD2018), Chicago, Illinois, USA, 26-29th Aug.

Publisher

© Asme

Version

  • AM (Accepted Manuscript)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Acceptance date

2018-05-01

Publication date

2018

Notes

This paper is in closed access. It was part of the 47th International Congress and Exposition on Noise Control Engineering (Inter-Noise 2018)

ISBN

9780791851425

Language

  • en

Location

Downtown Chicago, Illinois, USA

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