Underwater acoustic omnidirectional absorber

Gradient index media, which are designed by varying local element properties in given geometry, have been utilized to manipulate acoustic waves for a variety of devices. This study presents a cylindrical, two-dimensional acoustic “black hole” design that functions as an omnidirectional absorber for...

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Bibliographic Details
Published in:Applied physics letters 2014-02, Vol.104 (7)
Main Authors: Naify, Christina J., Martin, Theodore P., Layman, Christopher N., Nicholas, Michael, Thangawng, Abel L., Calvo, David C., Orris, Gregory J.
Format: Article
Language:English
Subjects:
Absorbers
Acoustic absorption
Acoustic properties
Acoustics
Applied physics
Cylinders
Metamaterials
Rubber
Underwater acoustics
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Summary:Gradient index media, which are designed by varying local element properties in given geometry, have been utilized to manipulate acoustic waves for a variety of devices. This study presents a cylindrical, two-dimensional acoustic “black hole” design that functions as an omnidirectional absorber for underwater applications. The design features a metamaterial shell that focuses acoustic energy into the shell's core. Multiple scattering theory was used to design layers of rubber cylinders with varying filling fractions to produce a linearly graded sound speed profile through the structure. Measured pressure intensity agreed with predicted results over a range of frequencies within the homogenization limit.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4865480