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Sound radiation from a fluid-filled spherical acoustic lens with an internal eccentric baffled spherical piston

Sound radiation from a fluid-filled spherical acoustic lens with an internal eccentric baffled spherical piston
Sound radiation from a fluid-filled spherical acoustic lens with an internal eccentric baffled spherical piston
An exact study on reradiation of an acoustic field due to radial/axial vibrations of a baffled spherical piston, while eccentrically positioned within a fluid-filled thin spherical elastic shell, into an external fluid medium is presented. This configuration, which is a realistic idealization of a liquid-filled spherical acoustic lens with focal point inside the lens when used as a sound projector, is of practical importance with multitude of possible applications in ocean engineering and underwater acoustics. The formulation utilizes the appropriate wave field expansions along with the translational addition theorems for spherical wave functions to develop a closed-form solution in form of infinite series. Numerical results reveal that in addition to frequency, cap angle, radiator position (eccentricity), cap surface velocity distribution, and dynamics of the elastic shell can be of significance in sound radiation.
acoustic lens, spherical piston, elastic shell, addition theorem, cap angle
0029-8018
1129-1146
Hasheminejad, Seyyed M.
591bd090-8fbb-4e7c-9f44-9da684f53b6c
Azarpeyvand, Mahdi
1d61e228-84cd-4330-bacd-0b189f0b05df
Hasheminejad, Seyyed M.
591bd090-8fbb-4e7c-9f44-9da684f53b6c
Azarpeyvand, Mahdi
1d61e228-84cd-4330-bacd-0b189f0b05df

Hasheminejad, Seyyed M. and Azarpeyvand, Mahdi (2004) Sound radiation from a fluid-filled spherical acoustic lens with an internal eccentric baffled spherical piston. Ocean Engineering, 31 (8-9), 1129-1146. (doi:10.1016/j.oceaneng.2003.10.010).

Record type: Article

Abstract

An exact study on reradiation of an acoustic field due to radial/axial vibrations of a baffled spherical piston, while eccentrically positioned within a fluid-filled thin spherical elastic shell, into an external fluid medium is presented. This configuration, which is a realistic idealization of a liquid-filled spherical acoustic lens with focal point inside the lens when used as a sound projector, is of practical importance with multitude of possible applications in ocean engineering and underwater acoustics. The formulation utilizes the appropriate wave field expansions along with the translational addition theorems for spherical wave functions to develop a closed-form solution in form of infinite series. Numerical results reveal that in addition to frequency, cap angle, radiator position (eccentricity), cap surface velocity distribution, and dynamics of the elastic shell can be of significance in sound radiation.

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More information

Published date: 2004
Keywords: acoustic lens, spherical piston, elastic shell, addition theorem, cap angle

Identifiers

Local EPrints ID: 28455
URI: http://eprints.soton.ac.uk/id/eprint/28455
ISSN: 0029-8018
PURE UUID: 3ffe878f-57e8-4fff-bfe6-0944f111b4c2

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Date deposited: 02 May 2006
Last modified: 15 Mar 2024 07:25

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Contributors

Author: Seyyed M. Hasheminejad
Author: Mahdi Azarpeyvand

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