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dc.contributor.authorKeesee, John Michealen_US
dc.date.accessioned2014-03-14T21:28:42Z
dc.date.available2014-03-14T21:28:42Z
dc.date.issued1989-06-05en_US
dc.identifier.otheretd-02062013-040208en_US
dc.identifier.urihttp://hdl.handle.net/10919/40954
dc.description.abstract

The calculation of critical speeds for turbomachinery with active magnetic bearings (AMBs) is of great interest due to the increasing number of applications of this new technology. The potential for increased turbomachine performance through improved AMB design has created the need for a more accurate method for predicting the system's undamped critical speeds. This thesis documents the development of a method which improves the accuracy of critical speed calculation by properly accounting for the influence of AMB sensor location on the undamped critical speeds. This investigation includes the development of an AMB modified Jeffcott model. The results from the AMB modified Jeffcott analysis give useful design guidance for the influence of the sensor location on the first and third modes of a symmetric rotor system. A more accurate solution using a transfer matrix method modified to account for AMB sensor locations is presented. The results from the transfer matrix method for an example compressor are presented showing the influence of the sensor placement on a standard undamped critical speed map. The mode shapes with sensor location at a typical design location are given to illustrate the importance of the sensor location.

en_US
dc.format.mediumBTDen_US
dc.publisherVirginia Techen_US
dc.relation.haspartLD5655.V855_1989.K427.pdfen_US
dc.subjectTurbomachinesen_US
dc.subject.lccLD5655.V855 1989.K427en_US
dc.titleInfluence of active magnetic bearing sensor location on the calculated critical speeds of turbomachineryen_US
dc.typeThesisen_US
dc.contributor.departmentMechanical Engineeringen_US
dc.description.degreeMaster of Scienceen_US
thesis.degree.nameMaster of Scienceen_US
thesis.degree.levelmastersen_US
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen_US
thesis.degree.disciplineMechanical Engineeringen_US
dc.contributor.committeechairKirk, R. Gordonen_US
dc.contributor.committeememberLeonard, Robert G.en_US
dc.contributor.committeememberElrod, David A.en_US
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-02062013-040208/en_US
dc.date.sdate2013-02-06en_US
dc.date.rdate2013-02-06
dc.date.adate2013-02-06en_US


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