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dc.contributor.authorHoroshenkov, Kirill V.*
dc.contributor.authorYin, Y.*
dc.date.accessioned2009-06-03T09:17:38Z
dc.date.available2009-06-03T09:17:38Z
dc.date.issued2005
dc.identifier.citationHoroshenkov, K.V. and Yin, Y. (2005). Attenuation of the higher-order cross-sectional modes in a duct with a thin porous layer. The Journal of the Acoustical Society of America. Vol.117, No. 2, pp. 528-535.en
dc.identifier.urihttp://hdl.handle.net/10454/2745
dc.descriptionNoen
dc.description.abstractA numerical method for sound propagation of higher-order cross-sectional modes in a duct of arbitrary cross-section and boundary conditions with nonzero, complex acoustic admittance has been considered. This method assumes that the cross-section of the duct is uniform and that the duct is of a considerable length so that the longitudinal modes can be neglected. The problem is reduced to a two-dimensional (2D) finite element (FE) solution, from which a set of cross-sectional eigen-values and eigen-functions are determined. This result is used to obtain the modal frequencies, velocities and the attenuation coefficients. The 2D FE solution is then extended to three-dimensional via the normal mode decomposition technique. The numerical solution is validated against experimental data for sound propagation in a pipe with inner walls partially covered by coarse sand or granulated rubber. The values of the eigen-frequencies calculated from the proposed numerical model are validated against those predicted by the standard analytical solution for both a circular and rectangular pipe with rigid walls. It is shown that the considered numerical method is useful for predicting the sound pressure distribution, attenuation, and eigen-frequencies in a duct with acoustically nonrigid boundary conditions. The purpose of this work is to pave the way for the development of an efficient inverse problem solution for the remote characterization of the acoustic boundary conditions in natural and artificial waveguides.en
dc.language.isoenen
dc.subjectAcoustic intensityen
dc.subjectAcoustic wave velocityen
dc.subjectAcoustic wave absorptionen
dc.subjectEigenvalues and eigenfunctionsen
dc.subjectAbsorbing mediaen
dc.subjectFinite element analysisen
dc.subjectAcoustic wave propagationen
dc.subjectAcoustic waveguidesen
dc.titleAttenuation of the higher-order cross-sectional modes in a duct with a thin porous layeren
dc.status.refereedYesen
dc.typeArticleen
dc.type.versionNo full-text available in the repositoryen
dc.relation.urlhttp://scitation.aip.org/journals/doc/JASMAN-ft/vol_117/iss_2/528_1.html


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