Harmonic analysis of lossy, piezoelectric composite transducers using the plane wave expansion method.

Abstract:

:Periodic composite ultrasonic transducers offer many advantages but the periodic pillar architecture can give rise to unwanted modes of vibration which interfere with the piston like motion of the fundamental thickness mode. In this paper, viscoelastic loss is incorporated into a three-dimensional plane wave expansion model (PWE) of these transducers. A comparison with experimental and finite element data is conducted and a design to damp out these lateral modes is investigated. Scaling and regularisation techniques are introduced to the PWE method to reduce ill-conditioning in the large matrices which can arise. The identification of the modes of vibration is aided by examining profiles of the displacements, electrical potential and Poynting vector. The dispersive behaviour of a 2-2 composite transducer with high shear attenuation in the passive phase is examined. The model shows that the use of a high shear attenuation filler material improves the frequency band gap surrounding the fundamental thickness mode.

journal_name

Ultrasonics

journal_title

Ultrasonics

authors

Orr LA,Mulholland AJ,O'Leary RL,Hayward G

doi

10.1016/j.ultras.2008.03.004

subject

Has Abstract

pub_date

2008-12-01 00:00:00

pages

652-63

issue

8

eissn

0041-624X

issn

1874-9968

pii

S0041-624X(08)00035-8

journal_volume

48

pub_type

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