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Dielectric and Mechanical Loading Effects of a Fluid on Lamb Waves Propagating in an Immersed Piezoelectric Plate

Published online by Cambridge University Press:  05 May 2011

C.-H. Yang  and
Y.-A. Lai
C.-H. Yang*
Affiliation:
Department of Mechanical Engineering, Chang Gung University, Kwei-Shan, Taoyuan, Taiwan 333, R. O. C.
Y.-A. Lai*
Affiliation:
Department of Mechanical Engineering, Chang Gung University, Kwei-Shan, Taoyuan, Taiwan 333, R. O. C.
*
* Associate Professor
** Graduate student
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Abstract

This research is focused on exploring the fluid loading effects on the dispersion curves of Lamb modes propagating in a piezoelectric plate. A theoretical treatment based on a partial wave analysis is developed to model the dispersion curves of Lamb modes propagating in an X-LiNbO3 plate loaded by a fluid with combined mechanical/dielectric properties. In particular, the mode-shifting characteristics caused by the fluid loading as a function of the propagation orientation are illustrated with numerical examples. Finally, for the case of water as an immersing fluid, individual attributions of the mechanical and dielectric loading effects causing the mode-shifting are analyzed. It is found that the dielectric loading effect dominates the mode-shifting while the mechanical density loading can be neglected while Lamb waves propagate in an X-LiNbO3 plate immersing in water. The current results provides useful information for the applications of acoustic plate mode (APM) devices used in liquid sensor applications.

Keywords

PiezoelectricFluid loadingDielectricLiNbO3DispersionAPM
Type
Articles
Information
Journal of Mechanics , Volume 21 , Issue 3 , September 2005 , pp. 179 - 186
Copyright
Copyright © The Society of Theoretical and Applied Mechanics, R.O.C. 2005

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