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Sound propagation through nonuniform ductsMethods of determining the transmission and attenuation of sound propagating in nonuniform ducts with and without mean flows are discussed. The approaches reviewed include purely numerical techniques, quasi-one-dimensional approximations, solutions for slowly varying cross sections, solutions for weak wall undulations, approximation of the duct by a series of stepped uniform cross sections, variational methods and solutions for the mode envelopes.
Document ID
19770003364
Document Type
Conference Paper
Authors
Nayfeh, A. H.
(Virginia Polytechnic Inst. and State Univ. Blacksburg, VA, United States)
Date Acquired
August 8, 2013
Publication Date
January 1, 1976
Publication Information
Publication: NASA. Langley Res. Center Advan. in Eng. Sci., Vol. 3
Subject Category
Acoustics
Funding Number(s)
CONTRACT_GRANT: NAS1-13884
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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IDRelationTitle19770003363Analytic PrimaryAdvances in Engineering Science, Volume 3