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Article: Active control of drag noise from a small axial flow fan

TitleActive control of drag noise from a small axial flow fan
Authors
Issue Date2006
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, 2006, v. 120 n. 1, p. 192-203 How to Cite?
AbstractNoise sources in an axial flow fan can be divided into fluctuating axial thrust forces and circumferential drag forces. For the popular design of a seven-blade rotor driven by a motor supported by four struts, drag noise dominates. This study aims to suppress the drag noise globally by active control schemes. Drag noise features a rotating dipole and it has to be cancelled by a secondary source of the same nature. This is achieved experimentally by a pair of loudspeakers positioned at right angles to each other on the fan rotational plane. An adaptive LMS feedforward scheme is used to produce the control signal for one loudspeaker and the time derivative of this signal is used to drive the other loudspeaker. The antisounds radiated by the two loudspeakers have a fixed phase relation of 90° forming a rotating dipole. An open-loop control scheme is also implemented for the purpose of comparison and easier implementation in real-life applications. The results show that the globally integrated sound power is reduced by about 13 dB for both closed-and open-loop schemes. A possible limiting factor for the cancellation performance is found to be the presence of higher order modes of drag noise. © 2006 Acoustical Society of America.
Persistent Identifierhttp://hdl.handle.net/10722/57192
ISSN
2015 Impact Factor: 1.572
2015 SCImago Journal Rankings: 0.938
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorWang, Jen_HK
dc.contributor.authorHuang, Len_HK
dc.date.accessioned2010-04-12T01:29:04Z-
dc.date.available2010-04-12T01:29:04Z-
dc.date.issued2006en_HK
dc.identifier.citationJournal Of The Acoustical Society Of America, 2006, v. 120 n. 1, p. 192-203en_HK
dc.identifier.issn0001-4966en_HK
dc.identifier.urihttp://hdl.handle.net/10722/57192-
dc.description.abstractNoise sources in an axial flow fan can be divided into fluctuating axial thrust forces and circumferential drag forces. For the popular design of a seven-blade rotor driven by a motor supported by four struts, drag noise dominates. This study aims to suppress the drag noise globally by active control schemes. Drag noise features a rotating dipole and it has to be cancelled by a secondary source of the same nature. This is achieved experimentally by a pair of loudspeakers positioned at right angles to each other on the fan rotational plane. An adaptive LMS feedforward scheme is used to produce the control signal for one loudspeaker and the time derivative of this signal is used to drive the other loudspeaker. The antisounds radiated by the two loudspeakers have a fixed phase relation of 90° forming a rotating dipole. An open-loop control scheme is also implemented for the purpose of comparison and easier implementation in real-life applications. The results show that the globally integrated sound power is reduced by about 13 dB for both closed-and open-loop schemes. A possible limiting factor for the cancellation performance is found to be the presence of higher order modes of drag noise. © 2006 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.titleActive control of drag noise from a small axial flow fanen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0001-4966&volume=120&issue=1&spage=192&epage=203&date=2006&atitle=Active+control+of+drag+noise+from+a+small+axial+flow+fanen_HK
dc.identifier.emailHuang, L:lixi@hku.hken_HK
dc.identifier.authorityHuang, L=rp00119en_HK
dc.description.naturepublished_or_final_versionen_HK
dc.identifier.doi10.1121/1.2204443en_HK
dc.identifier.scopuseid_2-s2.0-33745740515en_HK
dc.identifier.hkuros133793-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-33745740515&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume120en_HK
dc.identifier.issue1en_HK
dc.identifier.spage192en_HK
dc.identifier.epage203en_HK
dc.identifier.isiWOS:000238896500018-
dc.publisher.placeUnited Statesen_HK
dc.identifier.scopusauthoridWang, J=9639054400en_HK
dc.identifier.scopusauthoridHuang, L=7404735514en_HK

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