Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/12634
DC FieldValueLanguage
dc.contributorDepartment of Building Services Engineering-
dc.creatorLau, SK-
dc.creatorLeung, KH-
dc.date.accessioned2015-06-23T09:07:30Z-
dc.date.available2015-06-23T09:07:30Z-
dc.identifier.issn0001-4966-
dc.identifier.urihttp://hdl.handle.net/10397/12634-
dc.language.isoenen_US
dc.publisherAcoustical Society of Americaen_US
dc.titleTransmission characteristics of a tee-junction in a rectangular duct at higher-order modesen_US
dc.typeJournal/Magazine Articleen_US
dc.identifier.spage3028-
dc.identifier.epage3039-
dc.identifier.volume126-
dc.identifier.issue6-
dc.identifier.doi10.1121/1.3257209-
dcterms.abstractNumerical and experimental studies were undertaken to characterize the noise transmission and scattering properties in higher-order modes across the tee-junction of a rectangular duct used in ventilation and air-conditioning systems. To measure these properties, a formulation of a transmission matrix based on the transfer function and a two-microphone method was devised. The measurement of modal sound transmission and scattering coefficients is demonstrated for a duct element in a rectangular duct. The results of numerical simulations were verified by experiments. The results show that sound transmissions of fundamental mode and higher-order modes across the main duct are high at the eigen-frequencies of the main duct and sidebranch. Weak modal coupling of the branch-modes and the traveling wave in the main duct is observed at or very close to the eigen-frequencies of the sidebranch, which shifts excitation of the higher-order branch-modes at higher frequencies. A decrease in sound transmission and increase in sound scattering into higher-order modes occur with excitation of the axial branch-mode. Excitation of the longitudinal branch-mode due to branch-end reflection also results in lower sound transmission of higher-order modes across the junction along the main duct.-
dcterms.bibliographicCitationJournal of the Acoustical Society of America, 2009, v. 126, no. 6, p. 3028-3039-
dcterms.isPartOfJournal of the Acoustical Society of America-
dcterms.issued2009-
dc.identifier.isiWOS:000272838800027-
dc.identifier.scopus2-s2.0-72549097445-
dc.identifier.eissn1520-8524-
dc.identifier.rosgroupidr45818-
dc.description.ros2009-2010 > Academic research: refereed > Publication in refereed journal-
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