Bifurcation analysis of a flexible rotor supported by two fluid-film journal bearings

Document Type

Article

Publication Date

7-1-2006

Abstract

The effects of rotor stiffness on the bifurcation regions of a flexible rotor supported by two identical fluid-film journal bearings are presented. It is shown that the rotor stiffness has a pronounced influence on the bifurcation characteristics at the instability threshold speed. For short bearings, two bifurcation regions exist if the dimensionless rotor stiffness K̄ ≥ 4.3. On the other hand, three bifurcation regions exist if the dimensionless rotor stiffness K̄ < 4.3. Information is presented that allows one to easily predict both the instability threshold speed and its bifurcation type of a rotor-bearing system with any specific set of operating parameters. The results presented have been verified by laboratory experiments as well as several published results in the open literature. Several examples are presented to illustrate the application of the results for design purposes. Copyright © 2006 by ASME.

Publication Source (Journal or Book title)

Journal of Tribology

First Page

594

Last Page

603

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