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Computational methods for studying acoustic propagation in nonuniform waveguides.A variational technique is used to model sound transmission through a nonuniform duct segment consisting of an axial variation in wall admittance or cross sectional area. The method involves the Ritz minimization of functionals which have the governing equations as stationary conditions. The variational method is verified by application to segments of variables-separable geometry for which eigenfunction expansion techniques offer an alternative solution procedure, and by comparison with the results of stepped duct approximations to the nonuniformity. Quantitative data are presented which indicate the boundary condition matching to be a suitable measure of the accuracy of the transmitted field.
Document ID
19730060037
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Beckemeyer, R. J.
(Boeing Co. Wichita, Kan., United States)
Eversman, W.
(Wichita State University Wichita, Kan., United States)
Date Acquired
August 7, 2013
Publication Date
October 1, 1973
Subject Category
Fluid Mechanics
Report/Patent Number
AIAA PAPER 73-1006
Meeting Information
Meeting: Aero-Acoustics Conference
Location: Seattle, WA
Start Date: October 15, 1973
End Date: October 17, 1973
Sponsors: American Institute of Aeronautics and Astronautics
Accession Number
73A44839
Funding Number(s)
CONTRACT_GRANT: NGR-17-003-018
Distribution Limits
Public
Copyright
Other

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