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On the stabilising effect of gyroscopic moments in an automotive turbocharger

dc.contributor.authorKamesh, Punithavathy
dc.contributor.authorBrennan, Michael J. [UNESP]
dc.contributor.authorHolmes, Roy
dc.contributor.institutionUniv Southampton
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-05-20T13:29:24Z
dc.date.available2014-05-20T13:29:24Z
dc.date.issued2012-01-01
dc.description.abstractAutomotive turbochargers, which operate at very high speeds, exceeding 180,000 r/min, exhibit two strong sub-harmonic modes of vibrations due to oil-whirl instability. These are a conical mode and an in-phase whirl mode. The gyroscopic effects can be very important in such a rotor system. This article presents a theoretical investigation into these effects on the conical whirl instability of a turbocharger induced by the angular (tilting) motion of a rigid rotor. A simplified linear model is used to analyse the rotor-bearing system by investigating the effects of the gyroscopic moment on the internal moments. A gyroscopic coefficient, defined by the geometry of the rotor, is shown to govern the stability of the conical whirl motion. A threshold value of 1/2 is determined for this coefficient to suppress the conical whirl. This value remains unaffected if the rotor is asymmetric and is supported by floating ring bearings, which is the case in a practical turbocharger.en
dc.description.affiliationUniv Southampton, Inst Sound & Vibrat Res, Southampton S017 1BJ, Hants, England
dc.description.affiliationUniv Southampton, Sch Engn Sci, Southampton S017 1BJ, Hants, England
dc.description.affiliationUNESP, Dept Engn Mecan, Ilha Solteira, Brazil
dc.description.affiliationUnespUNESP, Dept Engn Mecan, Ilha Solteira, Brazil
dc.description.sponsorshipInstitute of Sound and Vibration Research, University of Southampton, UK
dc.format.extent2485-2495
dc.identifierhttp://dx.doi.org/10.1177/0954406212438142
dc.identifier.citationProceedings of The Institution of Mechanical Engineers Part C-Journal of Mechanical Engineering Science. London: Sage Publications Ltd, v. 226, n. C10, p. 2485-2495, 2012.
dc.identifier.doi10.1177/0954406212438142
dc.identifier.issn0954-4062
dc.identifier.urihttp://hdl.handle.net/11449/9912
dc.identifier.wosWOS:000309206200009
dc.language.isoeng
dc.publisherSage Publications Ltd
dc.relation.ispartofProceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science
dc.relation.ispartofjcr0.996
dc.relation.ispartofsjr0,436
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectGyroscopic effecten
dc.subjectlinear analysisen
dc.subjectturbochargeren
dc.subjectconical whirl instabilityen
dc.titleOn the stabilising effect of gyroscopic moments in an automotive turbochargeren
dc.typeArtigo
dcterms.licensehttp://www.uk.sagepub.com/aboutus/openaccess.htm
dcterms.rightsHolderSage Publications Ltd
unesp.campusUniversidade Estadual Paulista (Unesp), Faculdade de Engenharia, Ilha Solteirapt
unesp.departmentEngenharia Mecânica - FEISpt

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