Eriksson, Tobias J. R., Ramadas, Sivaram Nishal and Dixon, Steve M. (2016) Experimental and simulation characterisation of flexural vibration modes in unimorph ultrasound transducers. Ultrasonics, 65 . pp. 242-248. doi:10.1016/j.ultras.2015.09.018 ISSN 0041-624X.

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Abstract

A unimorph flexural transducer design is proposed and tested with regard to mode shapes and frequencies. The transducers consist of a passive metal cap structure, and a thin piezoelectric disc, rigidly bonded to the inside. Extensive finite element (FE) modelling, and experimental 2D, time-resolved displacement measurements were done to characterise the transducers flexural properties, and to compare them to the analytical solutions of thin vibrating plates. Emphasis was put on characterising the passive layer of the unimorph structure, before bonding the piezoelectric element, to understand how the active element affects the behaviour of the flexing plate. A high power Nd:YAG laser was used to actuate the metal plate (non-contact), and the frequency content of the resulting displacement signal was analysed to identify the flexural modes. The non-axisymmetric modes, which are conventionally disregarded because of their unfavourable acoustic properties, were also taken into account. There was excellent agreement between the experimental results and the FE simulation data. There was good agreement with the analytical edge clamped plate model, but with some notable deviations, which have not previously been identified or commented upon. Specifically, the second axisymmetric mode is split into three separate modes, which is not explained by the traditional theory of vibrating plates.

Item Type:	Journal Article
Subjects:	T Technology > TJ Mechanical engineering and machinery T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions:	Faculty of Science, Engineering and Medicine > Science > Physics
Library of Congress Subject Headings (LCSH):	Transducers , Vibration transducers, Ultrasonic transducers
Journal or Publication Title:	Ultrasonics
Publisher:	Elsevier Science BV
ISSN:	0041-624X
Official Date:	February 2016
Dates:	Date Event February 2016 Published 3 October 2015 Available 24 September 2015 Accepted 8 June 2015 Submitted
Volume:	65
Page Range:	pp. 242-248
DOI:	10.1016/j.ultras.2015.09.018
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Date of first compliant deposit:	7 February 2017
Date of first compliant Open Access:	8 February 2017
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