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Acoustical Scattering by Spherical Objects Containing Electrorheological Fluid Layers

[+] Author Affiliations
Liang-Wu Cai

Kansas State University, Manhattan, KS

Gregory J. Orris, David C. Calvo, Michael Nicholas

Naval Research Laboratory, Washington, DC

Paper No. IMECE2010-40109, pp. 413-418; 6 pages
  • ASME 2010 International Mechanical Engineering Congress and Exposition
  • Volume 13: Sound, Vibration and Design
  • Vancouver, British Columbia, Canada, November 12–18, 2010
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-4450-2
  • Copyright © 2010 by ASME


In an effort to explore the mechanism to exert control over the band gap in phononic structures or acoustic metamaterials, a layer of electrorheological (ER) fluid is introduced into a spherical scatterer. The ER fluids have the capability of changing the mechanical properties from fluid-like into a solid-like material in a matter of milliseconds. It is expected that such significant changes in the material properties would afford a range of significant opportunities for tuning the band gap. In this study, numerical analysis of acoustical scattering characteristics of such scatterers in a underwater environment is explored. The ER fluid layer is encased between a solid steel core and a steel shell, which provide electrodes to electrify the ER fluid. The ER fluid, both before and after the electrification is modeled as viscoelastic solid in order to account for its capability for sustaining the shear wave. Effects of externally applied electric field on the scattering characteristics are observed.

Copyright © 2010 by ASME



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