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

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Title	Active control of drag noise from a small axial flow fan
Authors	Wang, J1 Huang, L1
Issue Date	2006
Publisher	Acoustical 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?] DOI: http://dx.doi.org/10.1121/1.2204443
Abstract	Noise 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.
ISSN	0001-4966 2011 Impact Factor: 1.55 2011 SCImago Journal Rankings: 0.075
DOI	http://dx.doi.org/10.1121/1.2204443
ISI Accession Number ID	WOS:000238896500018
References	References in Scopus

DC Field	Value
dc.contributor.author	Wang, J
dc.contributor.author	Huang, L
dc.date.accessioned	2010-04-12T01:29:04Z
dc.date.available	2010-04-12T01:29:04Z
dc.date.issued	2006
dc.description.abstract	Noise 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.nature	published_or_final_version
dc.identifier.citation	Journal 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.doi	http://dx.doi.org/10.1121/1.2204443
dc.identifier.epage	203
dc.identifier.hkuros	133793
dc.identifier.isi	WOS:000238896500018
dc.identifier.issn	0001-4966 2011 Impact Factor: 1.55 2011 SCImago Journal Rankings: 0.075
dc.identifier.issue	1
dc.identifier.openurl
dc.identifier.scopus	eid_2-s2.0-33745740515
dc.identifier.spage	192
dc.identifier.uri	http://hdl.handle.net/10722/57192
dc.identifier.volume	120
dc.language	eng
dc.publisher	Acoustical Society of America. The Journal's web site is located at http://asa.aip.org/jasa.html
dc.publisher.place	United States
dc.relation.ispartof	Journal of the Acoustical Society of America
dc.relation.references	References in Scopus
dc.rights	Creative Commons: Attribution 3.0 Hong Kong License
dc.title	Active control of drag noise from a small axial flow fan
dc.type	Article

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Author Affiliations

Hong Kong Polytechnic University