Eigenmode Approach for a Periodic Composite Transducer Subject to Fluid Loading

[+] Author and Article Information
V. V. Varadan, Jen Hwa Jeng, Liang Chi Chin, Xiao Qi Bao, V. K. Varadhan

Research Center for the Engineering of Electronic & Acoustic Materials, Department of Engineering Science & Mechanics, The Pennsylvania State University, University Park, PA 16802

J. Vib. Acoust 120(2), 313-323 (Apr 01, 1998) (11 pages) doi:10.1115/1.2893833 History: Online February 26, 2008


A hybrid finite element eigenmode—Floquet mode representation is formulated and numerically implemented to study the performance of composite transducers subject to fluid loading. The periodic distribution of the piezoelectric elements in the form of rods in a dielectric host material permits consideration of only one unit cell of the distribution in the finite element solution. Again, due to periodicity, the acoustic field in the infinite fluid is represented as superposition of plane wave Floquet modes. The finite element method is used to solve the eigenmodes of vibration of the transducer and an eigenmode superposition with unknown weighting coefficients is interfaced with the Floquet representation. Continuity at the boundary is used to solve for both sets of unknown coefficients. The effect of rod cross section, concentration, material damping are studied as a function of frequency. Useful transducer parameters such as transmission efficiency and the conductance spectrum as well as reflection and transmission spectrum of the array are simulated numerically.

Copyright © 1998 by The American Society of Mechanical Engineers
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