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Acoustic radiation from a shell with internal structuresA method is developed to compute frequency response and acoustic radiation of a complex shell. The axisymmetric geometry of the shell includes cylindrical, conical, and spherical segments stiffened by discrete rings and bulkheads. The shell is coupled to internal masses and elastic frames. Shell segments are treated by transfer matrices. Rings, bulkheads, frames, and concentrated masses are treated by impedances at junctions of segments. The shell is coupled to an external acoustic fluid treated by Green's function and curved surface elements. A major issue facing the method's treatment of the fluid would be lack of existence or uniqueness encountered in the uncoupled, external acoustic problem at characteristic wavenumbers. By using a simple spherical shell, without internal structures, this potential hindrance is shown not to arise. A fuller application of the method awaits subsequent results.
Document ID
19900029228
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
El-Raheb, M.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Wagner, P.
(JPL Pasadena, CA, United States)
Date Acquired
August 14, 2013
Publication Date
June 1, 1989
Publication Information
Publication: Acoustical Society of America, Journal
Volume: 85
ISSN: 0001-4966
Subject Category
Acoustics
Accession Number
90A16283
Distribution Limits
Public
Copyright
Other

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