Influence of Induced Unbalance on Subsynchronous Vibrations of an Automotive Turbocharger

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dc.contributor.authorSterling, John Anthonyen
dc.contributor.committeechairKirk, R. Gordonen
dc.contributor.committeememberKasarda, Mary E. F.en
dc.contributor.committeememberWicks, Alfred L.en
dc.contributor.departmentMechanical Engineeringen
dc.date.accessioned2014-03-14T20:41:25Zen
dc.date.adate2009-07-30en
dc.date.available2014-03-14T20:41:25Zen
dc.date.issued2009-06-22en
dc.date.rdate2009-07-30en
dc.date.sdate2009-07-13en
dc.description.abstractRotordynamic instability is present in most or all automotive turbochargers. High subsynchronous amplitudes can cause a variety of problems in areas such as mechanical failures, emissions regulations and rotor design. Self-excited vibrations from sources of damping can lock in at lateral natural frequencies causing dangerously high vibration levels. The resulting high-amplitude conical and bending modes can be reduced in order to achieve a more robust system. This research focuses on the relationship between synchronous and subsynchronous amplitude levels. It is theorized that an increase in unbalance could cause a reduction in subsynchronous vibration amplitudes. Through the use of a custom turbocharger, a series of unbalances were applied to both the turbine and compressor wheels and the resulting amplitudes were recorded off a modified compressor nut. The resulting data were reduced and are presented at the end of this paper.en
dc.description.degreeMaster of Scienceen
dc.identifier.otheretd-07132009-192300en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-07132009-192300/en
dc.identifier.urihttp://hdl.handle.net/10919/33996en
dc.publisherVirginia Techen
dc.relation.haspartetd2.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectTurbochargeren
dc.subjectInstabilityen
dc.subjectSubsynchronousen
dc.subjectUnbalanceen
dc.titleInfluence of Induced Unbalance on Subsynchronous Vibrations of an Automotive Turbochargeren
dc.typeThesisen
thesis.degree.disciplineMechanical Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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