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Frequency modulation of waveguides in acoustic band-gap materials consisting of solid cylinders in viscous liquid

Authors
Journal
Physics Letters A
0375-9601
Publisher
Elsevier
Publication Date
Volume
374
Issue
9
Identifiers
DOI: 10.1016/j.physleta.2009.12.061
Keywords
  • Condensed Matter
Disciplines
  • Musicology
  • Physics

Abstract

Abstract We investigated waveguides in acoustic band-gap materials consisting of steel cylinders in a liquid with viscous damping. Numerical results show that when the viscous penetration depth is comparable to the structural length scale, linear defect states fall in complete acoustic band gaps forming waveguides. It is also found that the magnitude of the viscosity in the liquid has an influence on the frequency of waveguides, that large viscous damping can make the defect modes ascend. An expected frequency of waveguides can be obtained by modulating the viscous damping parameter θ.

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