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Numerical Studies on Band-Gap Structures and Resonant-Mode Wave-Guides of Typical Sonic Crystals Made of Rigid Cylinders in Fluid by Means of Elastic FDTD Method

[+] Author Affiliations
Toyokatsu Miyashita

Ryukoku University

Paper No. IMECE2005-79694, pp. 137-142; 6 pages
doi:10.1115/IMECE2005-79694
From:
  • ASME 2005 International Mechanical Engineering Congress and Exposition
  • Noise Control and Acoustics
  • Orlando, Florida, USA, November 5 – 11, 2005
  • Conference Sponsors: Noise Control and Acoustics Division
  • ISBN: 0-7918-4225-8 | eISBN: 0-7918-3769-6
  • Copyright © 2005 by ASME

abstract

We have investigated band-gap structures of three typical sonic/phononic crystals, namely periodic arrays of methacrylic resin cylinders in air, aluminum cylinders in air, and steel cylinders in water, by two different FDTD methods; one method is a sonic one that deals with only longitudinal waves, and the other is an elastic one that includes also shear waves. We show that both FDTD methods give almost the same band-gap structures for the former two crystals. Namely, the band-gaps by the sonic FDTD method lie at higher frequency only by 0.01 ~ 0.02 in the normalized frequency than those by the elastic one. The theoretical band-gap structures agree well with the experimental ones. In contrast, it is shown that the third crystal should be analyzed by the elastic FDTD method. Resonant-mode wave-guides are made by a periodic repetition of single-defects along a line in a sonic crystal of rigid cylinders in air. The obtained resonant and well-guided transmission band lies inside the full band-gap of the original bulk crystal. A combination of such wave-guides with a line-defect wave-guide is shown to have desirable characteristics for filtered wave-guides and wave-couplers.

Copyright © 2005 by ASME

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