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AuthorMiraskari, Mohammad
AuthorHemmati, Farzad
AuthorAlqaradawi, M. Y.
AuthorGadala, Mohamed S.
Available date2020-11-04T08:52:36Z
Publication Date2017
Publication NameProceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology
ResourceScopus
ISSN13506501
URIhttp://dx.doi.org/10.1177/1350650117691697
URIhttp://hdl.handle.net/10576/16876
AbstractDynamic coefficients of a finite length journal bearing are numerically calculated under laminar and turbulent regimes based on Ng-Pan-Elrod and Constantinescu models. Linear stability charts of a flexible rotor supported on laminar and turbulent journal bearings are found by calculating the threshold speed of instability associated to the start of instable oil whirl phenomenon. Local journal trajectories of the rotor-bearing system were found at different operating conditions solely based on the calculated dynamic coefficients in laminar and turbulent flow. Results show no difference between laminar and turbulent models at low loading while significant change of the size of the stable region was observed by increasing the Reynolds number in turbulent models. Stable margins based on the laminar flow at relatively low Sommerfeld numbers S ? 0. 05 were shown to fall inside the unstable region and hence rendering the laminar stability curves obsolete at high Reynolds numbers. Ng-Pan turbulent model was found to be generally more conservative and hence is recommended for rotor-bearing design. 1 Institution of Mechanical Engineers.
SponsorThe author(s) disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: The authors would like to thank the Qatar National Research Fund (QNRF) for partially funding this project.
Languageen
PublisherSAGE Publications Ltd
Subjectdynamic coefficients
Finite length journal bearing
Ng-Pan-Elrod and Constantinescu turbulent models
oil whirl
stability
threshold speed of instability
TitleLinear stability analysis of finite length journal bearings in laminar and turbulent regimes
TypeArticle
Pagination1254-1267
Issue Number10
Volume Number231
dc.accessType Abstract Only


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