A design approach for longitudinal–torsional ultrasonic transducers

Al-Budairi, H. , Lucas, M. and Harkness, P. (2013) A design approach for longitudinal–torsional ultrasonic transducers. Sensors and Actuators A: Physical, 198, pp. 99-106. (doi:10.1016/j.sna.2013.04.024)

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Abstract

This study investigates combining longitudinal and torsional (L–T) vibration responses at the output face of a Langevin transducer. A mode degeneration method is adopted that converts the longitudinal response excited by the axially poled piezoceramic discs in the transducer into combined L–T vibration in the transducer front mass using geometric modifications of the wave path. The study uses three techniques; numerical, analytical, and experimental, in order to estimate and validate transducer electro-mechanical parameters for different geometric modifications, and also to evaluate transducer performance for different excitation levels in terms of the desired L–T response. A finite element (FE) analysis is used to optimise the mechanical structure of the transducer while the analytical model, which is based on an equivalent-circuit approach, is used to estimate the electrical impedance spectra and to confirm some of the FE calculations prior to fabrication. These models are then validated through an experimental characterization of the vibration response and impedance response and the results show that the operating frequency and torsionality can be tailored through modification of the transducer geometry.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Lucas, Professor Margaret and Harkness, Dr Patrick and Al-Budairi, Dr Hassan
Authors: Al-Budairi, H., Lucas, M., and Harkness, P.
College/School:College of Science and Engineering > School of Engineering > Systems Power and Energy
Journal Name:Sensors and Actuators A: Physical
Publisher:Elsevier S.A.
ISSN:0924-4247
ISSN (Online):1873-3069

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