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Article: Sound propagation in and low frequency noise absorption by helium-filled porous material

TitleSound propagation in and low frequency noise absorption by helium-filled porous material
Authors
KeywordsPhysics
Sound
Issue Date2009
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, 2009, v. 126 n. 6, p. 3008-3019 How to Cite?
AbstractLow-frequency noise is difficult to deal with by traditional porous material due to its inherent high acoustic impedance. This study seeks to extend the effective range of sound absorption to lower frequencies by filling a low density gas, such as helium, in the porous material. Compared with conventional air-filled absorption material, the helium-filled porous material has a much reduced characteristic impedance; hence, a good impedance matching with pure air becomes more feasible at low frequencies. The acoustic properties of a series of helium-filled porous materials are investigated with a specially designed test rig. The characteristic of the sound propagation in a helium-filled porous material is established and validated experimentally. Based on the measured acoustic properties, the sound absorption performance of a helium-filled absorber (HA) of finite thickness is studied numerically as well as experimentally. For a random incidence field, the HA is found to perform much better than the air-filled absorber at low frequencies. The main advantage of HA lies in the middle range of oblique incidence angles where wave refraction in the absorber enhances sound absorption. The advantage of HA as duct lining is demonstrated both numerically and experimentally. © 2009 Acoustical Society of America.
Persistent Identifierhttp://hdl.handle.net/10722/124886
ISSN
2015 Impact Factor: 1.572
2015 SCImago Journal Rankings: 0.938
ISI Accession Number ID
Funding AgencyGrant Number
Hong Kong Polytechnic UniversityA-SA43
University of Hong Kong
Funding Information:

The first author thanks the Hong Kong Polytechnic University for its funding support (Grant No. A-SA43). Likewise, support from a seed fund for applied research at the University of Hong Kong is also acknowledged.

References

 

DC FieldValueLanguage
dc.contributor.authorChoy, YSen_HK
dc.contributor.authorHuang, Len_HK
dc.contributor.authorWang, Cen_HK
dc.date.accessioned2010-10-31T10:59:34Z-
dc.date.available2010-10-31T10:59:34Z-
dc.date.issued2009en_HK
dc.identifier.citationJournal Of The Acoustical Society Of America, 2009, v. 126 n. 6, p. 3008-3019en_HK
dc.identifier.issn0001-4966en_HK
dc.identifier.urihttp://hdl.handle.net/10722/124886-
dc.description.abstractLow-frequency noise is difficult to deal with by traditional porous material due to its inherent high acoustic impedance. This study seeks to extend the effective range of sound absorption to lower frequencies by filling a low density gas, such as helium, in the porous material. Compared with conventional air-filled absorption material, the helium-filled porous material has a much reduced characteristic impedance; hence, a good impedance matching with pure air becomes more feasible at low frequencies. The acoustic properties of a series of helium-filled porous materials are investigated with a specially designed test rig. The characteristic of the sound propagation in a helium-filled porous material is established and validated experimentally. Based on the measured acoustic properties, the sound absorption performance of a helium-filled absorber (HA) of finite thickness is studied numerically as well as experimentally. For a random incidence field, the HA is found to perform much better than the air-filled absorber at low frequencies. The main advantage of HA lies in the middle range of oblique incidence angles where wave refraction in the absorber enhances sound absorption. The advantage of HA as duct lining is demonstrated both numerically and experimentally. © 2009 Acoustical Society of America.en_HK
dc.languageengen_HK
dc.publisherAcoustical Society of America. The Journal's web site is located at http://asa.aip.org/jasa.htmlen_HK
dc.relation.ispartofJournal of the Acoustical Society of Americaen_HK
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.subjectPhysics-
dc.subjectSound-
dc.titleSound propagation in and low frequency noise absorption by helium-filled porous materialen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0001-4966&volume=126&issue=6&spage=3008&epage=3019&date=2009&atitle=Sound+propagation+in+and+low+frequency+noise+absorption+by+helium-filled+porous+materialen_HK
dc.identifier.emailHuang, L:lixi@hku.hken_HK
dc.identifier.authorityHuang, L=rp00119en_HK
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1121/1.3257182en_HK
dc.identifier.pmid20000914-
dc.identifier.scopuseid_2-s2.0-72549097824en_HK
dc.identifier.hkuros171599en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-72549097824&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume126en_HK
dc.identifier.issue6en_HK
dc.identifier.spage3008en_HK
dc.identifier.epage3019en_HK
dc.identifier.isiWOS:000272838800025-
dc.publisher.placeUnited Statesen_HK
dc.identifier.scopusauthoridChoy, YS=7004920275en_HK
dc.identifier.scopusauthoridHuang, L=7404735514en_HK
dc.identifier.scopusauthoridWang, C=23487195200en_HK

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