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Article: Active control of drag noise from a small axial flow fan
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TitleActive control of drag noise from a small axial flow fan
 
AuthorsWang, J1
Huang, L1
 
Issue Date2006
 
PublisherAcoustical Society of America. The Journal's web site is located at http://asa.aip.org/jasa.html
 
CitationJournal Of The Acoustical Society Of America, 2006, v. 120 n. 1, p. 192-203 [How to Cite?]
DOI: http://dx.doi.org/10.1121/1.2204443
 
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.
 
ISSN0001-4966
2012 Impact Factor: 1.646
2012 SCImago Journal Rankings: 0.716
 
DOIhttp://dx.doi.org/10.1121/1.2204443
 
ISI Accession Number IDWOS:000238896500018
 
ReferencesReferences in Scopus
 
DC FieldValue
dc.contributor.authorWang, J
 
dc.contributor.authorHuang, L
 
dc.date.accessioned2010-04-12T01:29:04Z
 
dc.date.available2010-04-12T01:29:04Z
 
dc.date.issued2006
 
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.
 
dc.description.naturepublished_or_final_version
 
dc.identifier.citationJournal Of The Acoustical Society Of America, 2006, v. 120 n. 1, p. 192-203 [How to Cite?]
DOI: http://dx.doi.org/10.1121/1.2204443
 
dc.identifier.doihttp://dx.doi.org/10.1121/1.2204443
 
dc.identifier.epage203
 
dc.identifier.hkuros133793
 
dc.identifier.isiWOS:000238896500018
 
dc.identifier.issn0001-4966
2012 Impact Factor: 1.646
2012 SCImago Journal Rankings: 0.716
 
dc.identifier.issue1
 
dc.identifier.openurl
 
dc.identifier.scopuseid_2-s2.0-33745740515
 
dc.identifier.spage192
 
dc.identifier.urihttp://hdl.handle.net/10722/57192
 
dc.identifier.volume120
 
dc.languageeng
 
dc.publisherAcoustical Society of America. The Journal's web site is located at http://asa.aip.org/jasa.html
 
dc.publisher.placeUnited States
 
dc.relation.ispartofJournal of the Acoustical Society of America
 
dc.relation.referencesReferences in Scopus
 
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License
 
dc.titleActive control of drag noise from a small axial flow fan
 
dc.typeArticle
 
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Author Affiliations
  1. Hong Kong Polytechnic University