Journal
JOURNAL OF VIBRATION AND CONTROL
Volume 19, Issue 14, Pages 2211-2222Publisher
SAGE PUBLICATIONS LTD
DOI: 10.1177/1077546312458945
Keywords
Active bearing; flow-induced instability; self-excited vibration; feedback control; journal bearing
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Funding
- NSF CAREER grant [CMS-0447576]
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Fluid-film bearings can suffer from flow-induced instabilities known as whirl' and whip,' especially when supporting lightly-loaded shafts. This phenomenon can lead to large rotor (self-excited) vibrations, which eventually result in rotor-bearing failure. In this paper, we introduce a new active hydrodynamic bearing to mitigate such vibrations in lightly loaded rotating machines. The system contains a rotating bushing, actuated by a motor, that serves as the control input. This input is used to control the mean flow velocity in the bearing and thereby the journal vibration. A simple feedback control law is proposed for the bushing velocity, and numerical simulations are presented to evaluate the active bearing.
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