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Article: Experimental study of sound propagation in a flexible duct

TitleExperimental study of sound propagation in a flexible duct
Authors
Issue Date2000
PublisherAcoustical Society of America. The Journal's web site is located at http://asa.aip.org/jasa.html
Citation
Journal Of The Acoustical Society Of America, 2000, v. 108 n. 2, p. 624-631 How to Cite?
AbstractPropagation of sound in a flexible duct is investigated both theoretically and experimentally. Strong coupling of sound and flexural waves on the duct wall is found when the wall-to-air mass ratio is of the order of unity. The axial phase speed of sound approaches the in vacuo speed of flexural waves (subsonic in this case) at low frequencies. However, a speed higher than the isentropic sound speed in free space (340 m/s) is found beyond a critical frequency which is a function of the mass ratio. Experiments using a duct with a finite section of tensioned membrane are compared with the propagating modes pertaining to the infinite membrane model. Satisfactory quantitative agreement is obtained and the measured phase speed ranges from 8.3 to 1348 m/s. In the moderate frequency range, the theory predicts high spatial damping rate for the subsonic waves, which is consistent with the experimental observation that subsonic waves become increasingly undetectable as the frequency increases. Substantial sound reflection is observed at the interface between the rigid and the flexible segments of the duct without cross-section discontinuity, which, together with the high spatial damping, could form a basis for passive control of low-frequency duct noise. (C) 2000 Acoustical Society of America.
Persistent Identifierhttp://hdl.handle.net/10722/156545
ISSN
2015 Impact Factor: 1.572
2015 SCImago Journal Rankings: 0.938
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorHuang, Len_US
dc.contributor.authorChoy, YSen_US
dc.contributor.authorSo, RMCen_US
dc.contributor.authorChong, TLen_US
dc.date.accessioned2012-08-08T08:42:54Z-
dc.date.available2012-08-08T08:42:54Z-
dc.date.issued2000en_US
dc.identifier.citationJournal Of The Acoustical Society Of America, 2000, v. 108 n. 2, p. 624-631en_US
dc.identifier.issn0001-4966en_US
dc.identifier.urihttp://hdl.handle.net/10722/156545-
dc.description.abstractPropagation of sound in a flexible duct is investigated both theoretically and experimentally. Strong coupling of sound and flexural waves on the duct wall is found when the wall-to-air mass ratio is of the order of unity. The axial phase speed of sound approaches the in vacuo speed of flexural waves (subsonic in this case) at low frequencies. However, a speed higher than the isentropic sound speed in free space (340 m/s) is found beyond a critical frequency which is a function of the mass ratio. Experiments using a duct with a finite section of tensioned membrane are compared with the propagating modes pertaining to the infinite membrane model. Satisfactory quantitative agreement is obtained and the measured phase speed ranges from 8.3 to 1348 m/s. In the moderate frequency range, the theory predicts high spatial damping rate for the subsonic waves, which is consistent with the experimental observation that subsonic waves become increasingly undetectable as the frequency increases. Substantial sound reflection is observed at the interface between the rigid and the flexible segments of the duct without cross-section discontinuity, which, together with the high spatial damping, could form a basis for passive control of low-frequency duct noise. (C) 2000 Acoustical Society of America.en_US
dc.languageengen_US
dc.publisherAcoustical Society of America. The Journal's web site is located at http://asa.aip.org/jasa.htmlen_US
dc.relation.ispartofJournal of the Acoustical Society of Americaen_US
dc.titleExperimental study of sound propagation in a flexible ducten_US
dc.typeArticleen_US
dc.identifier.emailHuang, L:lixi@hku.hken_US
dc.identifier.authorityHuang, L=rp00119en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1121/1.429594en_US
dc.identifier.scopuseid_2-s2.0-0033897727en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0033897727&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume108en_US
dc.identifier.issue2en_US
dc.identifier.spage624en_US
dc.identifier.epage631en_US
dc.identifier.isiWOS:000088626300021-
dc.publisher.placeUnited Statesen_US
dc.identifier.scopusauthoridHuang, L=7404735514en_US
dc.identifier.scopusauthoridChoy, YS=7004920275en_US
dc.identifier.scopusauthoridSo, RMC=16489407100en_US
dc.identifier.scopusauthoridChong, TL=7102931372en_US

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