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Article: Multiple drumlike silencer for low frequency duct noise reflection

TitleMultiple drumlike silencer for low frequency duct noise reflection
Authors
KeywordsMembrane
Tension
Transmission Loss
Issue Date2009
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/apacoust
Citation
Applied Acoustics, 2009, v. 70 n. 11-12, p. 1422-1430 How to Cite?
AbstractLow frequency duct noise is difficult to tackle by passive means within a certain space limitation. Drumlike silencer offers broadband sound reflection in the low-frequency region, e.g. 0.1-0.3 times the first cut-on frequency of the central duct. Optimization was carried out for the logarithmic bandwidth in which the transmission loss (TL) is greater than a pre-determined criterion value. The prediction was validated in laboratory but it was anticipated that the required high level of tension is difficult to implement in practice. It is found that the optimal tension is approximately proportional to the 3rd power of membrane length, so a partitioned membrane is expected to reduce the required tension. In order to optimize the partitioned drumlike silencer, a new cost function of total transmission loss, or insertion loss, with a frequency weighting in favour of a certain wide band of low frequencies is introduced. The new cost function removes the undesirable discontinuous behaviour occurring in the previous optimization process. It is also found that the partitioned silencer can drastically improve the weighted total TL and the tension required is indeed much reduced. The main performance improvement derives from around the lower frequency limit of interest. © 2009 Elsevier Ltd. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/157020
ISSN
2015 Impact Factor: 1.462
2015 SCImago Journal Rankings: 0.866
ISI Accession Number ID
Funding AgencyGrant Number
Hong Kong Polytechnic UniversityA.43.37. PH46
Funding Information:

The first author thanks the Hong Kong Polytechnic University for its funding support (A.43.37. PH46).

References

 

DC FieldValueLanguage
dc.contributor.authorChoy, YSen_US
dc.contributor.authorHuang, Len_US
dc.date.accessioned2012-08-08T08:44:59Z-
dc.date.available2012-08-08T08:44:59Z-
dc.date.issued2009en_US
dc.identifier.citationApplied Acoustics, 2009, v. 70 n. 11-12, p. 1422-1430en_US
dc.identifier.issn0003-682Xen_US
dc.identifier.urihttp://hdl.handle.net/10722/157020-
dc.description.abstractLow frequency duct noise is difficult to tackle by passive means within a certain space limitation. Drumlike silencer offers broadband sound reflection in the low-frequency region, e.g. 0.1-0.3 times the first cut-on frequency of the central duct. Optimization was carried out for the logarithmic bandwidth in which the transmission loss (TL) is greater than a pre-determined criterion value. The prediction was validated in laboratory but it was anticipated that the required high level of tension is difficult to implement in practice. It is found that the optimal tension is approximately proportional to the 3rd power of membrane length, so a partitioned membrane is expected to reduce the required tension. In order to optimize the partitioned drumlike silencer, a new cost function of total transmission loss, or insertion loss, with a frequency weighting in favour of a certain wide band of low frequencies is introduced. The new cost function removes the undesirable discontinuous behaviour occurring in the previous optimization process. It is also found that the partitioned silencer can drastically improve the weighted total TL and the tension required is indeed much reduced. The main performance improvement derives from around the lower frequency limit of interest. © 2009 Elsevier Ltd. All rights reserved.en_US
dc.languageengen_US
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/apacousten_US
dc.relation.ispartofApplied Acousticsen_US
dc.subjectMembraneen_US
dc.subjectTensionen_US
dc.subjectTransmission Lossen_US
dc.titleMultiple drumlike silencer for low frequency duct noise reflectionen_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.doi10.1016/j.apacoust.2009.03.010en_US
dc.identifier.scopuseid_2-s2.0-68549085234en_US
dc.identifier.hkuros171600-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-68549085234&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume70en_US
dc.identifier.issue11-12en_US
dc.identifier.spage1422en_US
dc.identifier.epage1430en_US
dc.identifier.isiWOS:000270120300008-
dc.publisher.placeUnited Kingdomen_US
dc.identifier.scopusauthoridChoy, YS=7004920275en_US
dc.identifier.scopusauthoridHuang, L=7404735514en_US
dc.identifier.citeulike5332599-

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