Underwater sound transmission through arrays of disk cavities in a soft elastic medium

David C. Calvo, Abel L. Thangawng, Christopher N. Layman, Riccardo Casalini, Shadi F. Othman

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Scattering from a cavity in a soft elastic medium, such as silicone rubber, resembles scattering from an underwater bubble in that low-frequency monopole resonance is obtainable in both cases. Arrays of cavities can therefore be used to reduce underwater sound transmission using thin layers and low void fractions. This article examines the role of cavity shape by microfabricating arrays of disk-shaped air cavities into single and multiple layers of polydimethylsiloxane. Comparison is made with the case of equivalent volume cylinders which approximate spheres. Measurements of ultrasonic underwater sound transmission are compared with finite element modeling predictions. The disks provide a deeper transmission minimum at a lower frequency owing to the drum-type breathing resonance. The resonance of a single disk cavity in an unbounded medium is also calculated and compared with a derived estimate of the natural frequency of the drum mode. Variation of transmission is determined as a function of disk tilt angle, lattice constant, and layer thickness. A modeled transmission loss of 18 dB can be obtained at a wavelength about 20 times the three-layer thickness, and thinner results (wavelength/thickness ∼ 240) are possible for the same loss with a single layer depending on allowable hydrostatic pressure.

Original languageEnglish (US)
Pages (from-to)2537-2547
Number of pages11
JournalJournal of the Acoustical Society of America
Volume138
Issue number4
DOIs
StatePublished - Oct 1 2015

Fingerprint

underwater acoustics
elastic media
sound transmission
cavities
drums
low frequencies
silicone rubber
transmission loss
breathing
scattering
wavelengths
monopoles
hydrostatic pressure
resonant frequencies
voids
bubbles
ultrasonics
Sound
Layer
Underwater

ASJC Scopus subject areas

  • Arts and Humanities (miscellaneous)
  • Acoustics and Ultrasonics

Cite this

Underwater sound transmission through arrays of disk cavities in a soft elastic medium. / Calvo, David C.; Thangawng, Abel L.; Layman, Christopher N.; Casalini, Riccardo; Othman, Shadi F.

In: Journal of the Acoustical Society of America, Vol. 138, No. 4, 01.10.2015, p. 2537-2547.

Research output: Contribution to journalArticle

Calvo, David C. ; Thangawng, Abel L. ; Layman, Christopher N. ; Casalini, Riccardo ; Othman, Shadi F. / Underwater sound transmission through arrays of disk cavities in a soft elastic medium. In: Journal of the Acoustical Society of America. 2015 ; Vol. 138, No. 4. pp. 2537-2547.
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