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Shock and Vibration
Volume 11, Issue 5-6, Pages 625-635
http://dx.doi.org/10.1155/2004/626983

Sound Radiation due to Modal Vibrations of a Spherical Source in an Acoustic Quarterspace

Seyyed M. Hasheminejad and Mahdi Azarpeyvand

Department of Mechanical Engineering, Iran University of Science and Technology, Narmak, Tehran 16844, Iran

Received 7 September 2002; Revised 22 February 2004

Copyright © 2004 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Radiation of sound from a spherical source, vibrating with an arbitrary, axisymmetric, time-harmonic surface velocity, while positioned within an acoustic quarterspace is analyzed in an exact manner. The formulation utilizes the appropriate wave field expansions along with the translational addition theorem for spherical wave functions in combination with the classical method of images to develop a closed-form solution in form of infinite series. The analytical results are illustrated with numerical examples in which the spherical source, vibrating in the pulsating (n = 0) and translational oscillating (n = 1) modes, is positioned near the rigid boundary of a water-filled quarterspace. Subsequently, the basic acoustic field quantities such as the modal acoustic radiation impedance load and the radiation intensity distribution are evaluated for representative values of the parameters characterizing the system.