Acoustic radiation from a pulsating spherical cap set on a spherical baffle near a hard/soft flat surface
Acoustic radiation from a pulsating spherical cap set on a spherical baffle near a hard/soft flat surface
Radiation of sound from a spherical piston, set in the side of a rigid sphere, undergoing harmonic radial surface vibrations in an acoustic halfspace is analyzed in an exact fashion using the classical method of separation of variables. The method of images in combination with the translational addition theorems for spherical wave functions is employed to take the presence of the flat boundary into account. The analytical results are illustrated with numerical examples in which the piston is pulsating near the rigid/compliant boundary of a water-filled halfspace. Subsequently, the basic acoustic field quantities such as the acoustic radiation impedance load and the radiation intensity distribution are evaluated for representative values of the parameters characterizing the system. Numerical results reveal the important effects of excitation frequency, source position, and cap angle on the acoustic radiation impedance load and the radiation intensity distribution. The presented work can lead to a better understanding of dynamic response of near-surface underwater transducers.
acoustic field, acoustic impedance, acoustic radiators, eigenvalues and eigenfunctions, numerical analysis, underwater sound, vibrations
110-117
Hasheminejad, S.M.
a846e2d7-3224-4028-ac78-8c970d64bd56
Azarpeyvand, M.
05191a9a-040a-45d2-a5d7-d4044b4c60ba
2004
Hasheminejad, S.M.
a846e2d7-3224-4028-ac78-8c970d64bd56
Azarpeyvand, M.
05191a9a-040a-45d2-a5d7-d4044b4c60ba
Hasheminejad, S.M. and Azarpeyvand, M.
(2004)
Acoustic radiation from a pulsating spherical cap set on a spherical baffle near a hard/soft flat surface.
IEEE Journal of Oceanic Engineering, 29 (1), .
(doi:10.1109/JOE.2003.822978).
Abstract
Radiation of sound from a spherical piston, set in the side of a rigid sphere, undergoing harmonic radial surface vibrations in an acoustic halfspace is analyzed in an exact fashion using the classical method of separation of variables. The method of images in combination with the translational addition theorems for spherical wave functions is employed to take the presence of the flat boundary into account. The analytical results are illustrated with numerical examples in which the piston is pulsating near the rigid/compliant boundary of a water-filled halfspace. Subsequently, the basic acoustic field quantities such as the acoustic radiation impedance load and the radiation intensity distribution are evaluated for representative values of the parameters characterizing the system. Numerical results reveal the important effects of excitation frequency, source position, and cap angle on the acoustic radiation impedance load and the radiation intensity distribution. The presented work can lead to a better understanding of dynamic response of near-surface underwater transducers.
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Published date: 2004
Keywords:
acoustic field, acoustic impedance, acoustic radiators, eigenvalues and eigenfunctions, numerical analysis, underwater sound, vibrations
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Local EPrints ID: 28456
URI: http://eprints.soton.ac.uk/id/eprint/28456
ISSN: 0364-9059
PURE UUID: e743d29c-729c-468e-bad5-b3f0c25676ae
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Date deposited: 02 May 2006
Last modified: 15 Mar 2024 07:25
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Author:
S.M. Hasheminejad
Author:
M. Azarpeyvand
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