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On the Instability Threshold of Journal Bearing Supported Rotors
Joint Authors
Mendes, Ricardo Ugliara
Cavalca, Katia Lucchesi
Source
International Journal of Rotating Machinery
Issue
Vol. 2014, Issue 2014 (31 Dec. 2014), pp.1-17, 17 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2014-02-03
Country of Publication
Egypt
No. of Pages
17
Main Subjects
Abstract EN
Journal bearing supported rotors present two kinds of self-excited vibrations: oil-whirl and oil-whip.
The first one is commonly masked by the rotor unbalance, hence being rarely associated with instability problems.
Oil-whip is a severe vibration which occurs when the oil-whirl frequency coincides with the first flexural natural frequency of the shaft.
In many cases, oil-whip is the only fluid-induced instability considered during the design stage; however, experimental evidences have shown that the instability threshold may occur much sooner, demanding a better comprehension of the instability mechanism.
In this context, numerical simulations were made in order to improve the identification of the instability threshold for two test rig configurations: one on which the instability occurs on the oil-whip frequency, and another which became unstable before this threshold.
Therefore, the main contribution of this paper is to present an investigation of two different thresholds of fluid-induced instabilities and their detectability on design stage simulations based on rotordynamic analysis using linear speed dependent coefficients for the bearings.
American Psychological Association (APA)
Mendes, Ricardo Ugliara& Cavalca, Katia Lucchesi. 2014. On the Instability Threshold of Journal Bearing Supported Rotors. International Journal of Rotating Machinery،Vol. 2014, no. 2014, pp.1-17.
https://search.emarefa.net/detail/BIM-464997
Modern Language Association (MLA)
Mendes, Ricardo Ugliara& Cavalca, Katia Lucchesi. On the Instability Threshold of Journal Bearing Supported Rotors. International Journal of Rotating Machinery No. 2014 (2014), pp.1-17.
https://search.emarefa.net/detail/BIM-464997
American Medical Association (AMA)
Mendes, Ricardo Ugliara& Cavalca, Katia Lucchesi. On the Instability Threshold of Journal Bearing Supported Rotors. International Journal of Rotating Machinery. 2014. Vol. 2014, no. 2014, pp.1-17.
https://search.emarefa.net/detail/BIM-464997
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-464997