Eccentricity effects on acoustic radiation from a spherical source suspended within a thermoviscous fluid sphere
Eccentricity effects on acoustic radiation from a spherical source suspended within a thermoviscous fluid sphere
Acoustic radiation from a spherical source undergoing angularly periodic axisymmetric harmonic surface vibrations while eccentrically suspended within a thermoviscous fluid sphere, which is immersed in a viscous thermally conducting unbounded fluid medium, is analyzed in an exact fashion. The formulation uses the appropriate wave-harmonic field expansions along with the translational addition theorem for spherical wave functions and the relevant boundary conditions to develop a closed-form solution in form of infinite series. The analytical results are illustrated with a numerical example in which the vibrating source is eccentrically positioned within a chemical fluid sphere submerged in water. The modal acoustic radiation impedance load on the source and the radiated far-field pressure are evaluated and discussed for representative values of the parameters characterizing the system. The proposed model can lead to a better understanding of dynamic response of an underwater acoustic lens. It is equally applicable in miniature transducer analysis and design with applications in medical ultrasonics.
1444-1454
Hasheminejad, S.M.
a846e2d7-3224-4028-ac78-8c970d64bd56
Azarpeyvand, M.
05191a9a-040a-45d2-a5d7-d4044b4c60ba
November 2003
Hasheminejad, S.M.
a846e2d7-3224-4028-ac78-8c970d64bd56
Azarpeyvand, M.
05191a9a-040a-45d2-a5d7-d4044b4c60ba
Hasheminejad, S.M. and Azarpeyvand, M.
(2003)
Eccentricity effects on acoustic radiation from a spherical source suspended within a thermoviscous fluid sphere.
IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, 50 (11), .
(doi:10.1109/TUFFC.2003.1251128).
Abstract
Acoustic radiation from a spherical source undergoing angularly periodic axisymmetric harmonic surface vibrations while eccentrically suspended within a thermoviscous fluid sphere, which is immersed in a viscous thermally conducting unbounded fluid medium, is analyzed in an exact fashion. The formulation uses the appropriate wave-harmonic field expansions along with the translational addition theorem for spherical wave functions and the relevant boundary conditions to develop a closed-form solution in form of infinite series. The analytical results are illustrated with a numerical example in which the vibrating source is eccentrically positioned within a chemical fluid sphere submerged in water. The modal acoustic radiation impedance load on the source and the radiated far-field pressure are evaluated and discussed for representative values of the parameters characterizing the system. The proposed model can lead to a better understanding of dynamic response of an underwater acoustic lens. It is equally applicable in miniature transducer analysis and design with applications in medical ultrasonics.
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Published date: November 2003
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Local EPrints ID: 66673
URI: http://eprints.soton.ac.uk/id/eprint/66673
PURE UUID: c8dca6c5-1a09-4d25-a3a5-6c3f1e9caff1
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Date deposited: 08 Jul 2009
Last modified: 13 Mar 2024 18:28
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Author:
S.M. Hasheminejad
Author:
M. Azarpeyvand
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