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Simulation of non-linear bearing forces for post-stability investigationDifferent types of bearing designs were developed to improve dynamic properties of rotor-bearing systems. Elliptical bearings, multisleeve bearings, tilting pad and other designs such as herringbone groove were utilized to increase resistance to the onset of self excited vibrations. Experimental trials are costly, two alternative methods are used to gain a qualitative insight. The first one creates mathematical model and applies both a digital or an analog computer simulation. The second one investigates phenomena occurring on the laboratory rig with the bearing replaced by an electronic simulating device, working in a feedback loop, which produces forces,which are functions of journal displacement and velocity. The simulated hydrodynamic forces are produced according to assumed characteristics matched to the bearing type. The principal benefit of the analog simulation is that nonlinear characteristics of a subsystem are precisely identified and mathematical methods applied for a wide class of problems are checked on the experimental installation.
Document ID
Document Type
Conference Paper
Parszewski, Z. A. (Melbourne Univ. Parkville, Australia)
Krodiewski, J. M. (Melbourne Univ. Parkville, Australia)
Krynicki, K. (Melbourne Univ. Parkville, Australia)
Salek, A. E. (Melbourne Univ. Parkville, Australia)
Date Acquired
August 12, 2013
Publication Date
December 1, 1985
Publication Information
Publication: NASA. Lewis Research Center Instability in Rotating Machinery
Subject Category
Distribution Limits
Work of the US Gov. Public Use Permitted.

Available Downloads

NameType 19860020691.pdf STI

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IDRelationTitle19860020688Analytic PrimaryInstability in Rotating Machinery