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Article: Suppression of broadband noise radiated by a low-speed fan in a duct

TitleSuppression of broadband noise radiated by a low-speed fan in a duct
Authors
Issue Date2010
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, 2010, v. 128 n. 1, p. 152-163 How to Cite?
AbstractAttenuation of ducted fan noise remains a technical challenge in the low frequency range as traditional duct lining becomes ineffective. This study proposes a reactive method to suppress the sound radiation from an axial-flow fan. The method is particularly effective in the low frequency region and covers a broad band. Its effect is derived from two mechanisms. One is the reduction in the confining effects of duct walls when the duct radius is increased; the other is the acoustic interference between the direct radiation from the fan and reflections by the duct junctions. This interference is always destructive for axial dipoles when the frequency approaches zero. This performance differs from normal passive control methods, which become totally ineffective toward zero frequency. An approximate plane-wave theory explains the essential physics of the method, and its quantitative prediction is found to agree well with a full numerical simulation using a spectral method of Chebyshev collocation. The latter is validated by experiment using an axial-flow fan in a duct of finite length. Broadband noise reduction is achieved while the flow speed is kept unchanged. Practical difficulties of implementation for a fan with high pressure increase are discussed. © 2010 Acoustical Society of America.
Persistent Identifierhttp://hdl.handle.net/10722/139397
ISSN
2015 Impact Factor: 1.572
2015 SCImago Journal Rankings: 0.938
ISI Accession Number ID
Funding AgencyGrant Number
Hong Kong SAR GovernmentHKU 5170/05E
HKU 5178/06E
University of Hong Kong
Funding Information:

The authors wish to acknowledge the funding support from the Research Grants Council of the Hong Kong SAR Government under the Grant No. HKU 5170/05E, while part of the computation was supported by HKU 5178/06E. The second author is also supported by a postgraduate studentship by the University of Hong Kong.

References
Grants

 

DC FieldValueLanguage
dc.contributor.authorHuang, Len_HK
dc.contributor.authorMa, Xen_HK
dc.contributor.authorFeng, LGen_HK
dc.date.accessioned2011-09-23T05:49:08Z-
dc.date.available2011-09-23T05:49:08Z-
dc.date.issued2010en_HK
dc.identifier.citationJournal Of The Acoustical Society Of America, 2010, v. 128 n. 1, p. 152-163en_HK
dc.identifier.issn0001-4966en_HK
dc.identifier.urihttp://hdl.handle.net/10722/139397-
dc.description.abstractAttenuation of ducted fan noise remains a technical challenge in the low frequency range as traditional duct lining becomes ineffective. This study proposes a reactive method to suppress the sound radiation from an axial-flow fan. The method is particularly effective in the low frequency region and covers a broad band. Its effect is derived from two mechanisms. One is the reduction in the confining effects of duct walls when the duct radius is increased; the other is the acoustic interference between the direct radiation from the fan and reflections by the duct junctions. This interference is always destructive for axial dipoles when the frequency approaches zero. This performance differs from normal passive control methods, which become totally ineffective toward zero frequency. An approximate plane-wave theory explains the essential physics of the method, and its quantitative prediction is found to agree well with a full numerical simulation using a spectral method of Chebyshev collocation. The latter is validated by experiment using an axial-flow fan in a duct of finite length. Broadband noise reduction is achieved while the flow speed is kept unchanged. Practical difficulties of implementation for a fan with high pressure increase are discussed. © 2010 Acoustical Society of America.en_HK
dc.languageengen_US
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.rightsJournal of the Acoustical Society of America. Copyright © Acoustical Society of America.en_US
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.rightsCopyright (2010) Acoustical Society of America. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the Acoustical Society of America. The following article appeared in (Journal of the Acoustical Society of America, 2010, v. 128 n. 1, p. 152-163) and may be found at (http://asadl.org/jasa/resource/1/jasman/v128/i1/p152_s1).en_US
dc.subject.meshAcoustics - instrumentation-
dc.subject.meshAir Conditioning - adverse effects - instrumentation-
dc.subject.meshComputer Simulation-
dc.subject.meshEquipment Design-
dc.subject.meshNoise - prevention and control-
dc.titleSuppression of broadband noise radiated by a low-speed fan in a ducten_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0001-4966&volume=128&issue=1&spage=152&epage=163&date=2010&atitle=Suppression+of+broadband+noise+radiated+by+a+low-speed+fan+in+a+ducten_US
dc.identifier.emailHuang, L:lixi@hku.hken_HK
dc.identifier.authorityHuang, L=rp00119en_HK
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1121/1.3372749en_HK
dc.identifier.pmid20649210-
dc.identifier.scopuseid_2-s2.0-77955208544en_HK
dc.identifier.hkuros194964en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-77955208544&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume128en_HK
dc.identifier.issue1en_HK
dc.identifier.spage152en_HK
dc.identifier.epage163en_HK
dc.identifier.eissn1520-8524-
dc.identifier.isiWOS:000279999700029-
dc.publisher.placeUnited Statesen_HK
dc.relation.projectThe suppression of multiple tones for small axial-flow fans-
dc.relation.projectStability of flow over a broadband wave reflector-
dc.identifier.scopusauthoridHuang, L=7404735514en_HK
dc.identifier.scopusauthoridMa, X=35737550800en_HK
dc.identifier.scopusauthoridFeng, LG=36628346300en_HK

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