On the thermoelastic instability of foil bearings

Published experimental evidence reveals that foil bearings are prone to damage due to thermal runaway under certain operating conditions where thermoelastic instability sets in. This paper describes a methodology and a closed-form solution for prediction of the critical speed at which a foil bearing...

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Bibliographic Details
Published inTribology international Vol. 121; pp. 10 - 20
Main Authors Samanta, P., Khonsari, M.M.
Format Journal Article
LanguageEnglish
Published Kidlington Elsevier Ltd 01.05.2018
Elsevier BV
Subjects
Configurations
Failure analysis
Foil bearings
Hot spots
Journal bearings
Stability
Thermal runaway
Thermoelastic instability
Velocity
Thermoelastic instability
Hot spots
Foil bearings
Thermal runaway
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Summary:Published experimental evidence reveals that foil bearings are prone to damage due to thermal runaway under certain operating conditions where thermoelastic instability sets in. This paper describes a methodology and a closed-form solution for prediction of the critical speed at which a foil bearing can become thermoelastically unstable. The theoretical predictions have been verified with several published experimental results. While the model pertains to a journal bearing-type configuration, it can be readily extended to other bearing configurations. •Thermoelastic instability leads to bearing damage and failure in foil bearings.•A closed form analytical solution predict the critical speed of foil bearing failure.•Experimental results confirm analytical predictions of themoelastic failure.
ISSN:0301-679X
1879-2464
DOI:10.1016/j.triboint.2018.01.014