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Article: A study of active tonal noise control for a small axial flow fan

TitleA study of active tonal noise control for a small axial flow fan
Authors
Issue Date2005
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, 2005, v. 117 n. 2, p. 734-743 How to Cite?
AbstractSound radiated by a computer cooling fan consists of tones which are phase locked with the rotation, and other less deterministic tones and broadband random noise. This paper demonstrates the feasibility of globally eliminating the rotation-locked tones by applying a very simple destructive interference to a modified cooling fan with the number of struts equal to the number of rotor blades. The rig consists of a miniature electret microphone used as a rotation sensor, an ordinary loudspeaker, and a bandpass filter with adjustable amplitude and phase delay. The microphone is located at the inlet bellmouth of the fan to pick up the fluctuating aerodynamic pressure caused by the passing rotor blades. The pressure spectrum is rich in the blade passing frequency (BPF) and its low-order harmonics. It provides much better performance than a pulse-generating tachometer. Analysis of the original fan noise shows that about 90% of the radiated tonal sound is phase locked with rotation, and this portion is almost completely eliminated in all directions. The reductions of the radiated sound power in the first two BPFs are 18.5 and 13.0 dB, respectively, and the overall sound power reduction is 11.0 dB. © 2005 Acoustical Society of America.
Persistent Identifierhttp://hdl.handle.net/10722/156736
ISSN
2015 Impact Factor: 1.572
2015 SCImago Journal Rankings: 0.938
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorWang, Jen_US
dc.contributor.authorHuang, Len_US
dc.contributor.authorCheng, Len_US
dc.date.accessioned2012-08-08T08:43:45Z-
dc.date.available2012-08-08T08:43:45Z-
dc.date.issued2005en_US
dc.identifier.citationJournal Of The Acoustical Society Of America, 2005, v. 117 n. 2, p. 734-743en_US
dc.identifier.issn0001-4966en_US
dc.identifier.urihttp://hdl.handle.net/10722/156736-
dc.description.abstractSound radiated by a computer cooling fan consists of tones which are phase locked with the rotation, and other less deterministic tones and broadband random noise. This paper demonstrates the feasibility of globally eliminating the rotation-locked tones by applying a very simple destructive interference to a modified cooling fan with the number of struts equal to the number of rotor blades. The rig consists of a miniature electret microphone used as a rotation sensor, an ordinary loudspeaker, and a bandpass filter with adjustable amplitude and phase delay. The microphone is located at the inlet bellmouth of the fan to pick up the fluctuating aerodynamic pressure caused by the passing rotor blades. The pressure spectrum is rich in the blade passing frequency (BPF) and its low-order harmonics. It provides much better performance than a pulse-generating tachometer. Analysis of the original fan noise shows that about 90% of the radiated tonal sound is phase locked with rotation, and this portion is almost completely eliminated in all directions. The reductions of the radiated sound power in the first two BPFs are 18.5 and 13.0 dB, respectively, and the overall sound power reduction is 11.0 dB. © 2005 Acoustical Society of America.en_US
dc.languageengen_US
dc.publisherAcoustical Society of America. The Journal's web site is located at http://asa.aip.org/jasa.htmlen_US
dc.relation.ispartofJournal of the Acoustical Society of Americaen_US
dc.titleA study of active tonal noise control for a small axial flow fanen_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.doi10.1121/1.1848072en_US
dc.identifier.scopuseid_2-s2.0-13544269347en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-13544269347&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume117en_US
dc.identifier.issue2en_US
dc.identifier.spage734en_US
dc.identifier.epage743en_US
dc.identifier.isiWOS:000226986900026-
dc.publisher.placeUnited Statesen_US
dc.identifier.scopusauthoridWang, J=9639054400en_US
dc.identifier.scopusauthoridHuang, L=7404735514en_US
dc.identifier.scopusauthoridCheng, L=7403337597en_US

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