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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/18050
Title: Journal motion simulation of hybrid journal bearing considering viscosity variation due to temperature change
Authors: Kumar V.
Sharma, Satish Chandra
Jain S.C.
Published in: Proceedings of American Society of Mechanical Engineers, Tribology Division, TRIB
Abstract: A journal bearing system, if journal is disturbed from its equilibrium position, experiences change in the hydrodynamic forces acting on it. This disturbs the equilibrium of the journal and makes its center to whirl around the static equilibrium position. The dynamic response of a journal bearing system under these conditions can be obtained using either linear or non-linear equation of journal motion. The present work is aimed to determine realistic dynamic response of hole-entry hybrid journal bearing system compensated with constant flow valve restrictor. In this paper, the nonlinearized dynamic response of the journal bearing system is studied by considering two cases of journal mass (MJ) with respect to critical mass (MÌ„ cl) obtained from linear analysis, i.e MÌ„J = MÌ„cl and MÌ„J > MÌ„cl. The deviation in stability margins is established by comparing the results obtained from the linearized and nonlinearized stability analysis for each case namely, isothermal, elastohyrdostatic, thermohydroststic and thermoelastohydrostatic. The coupled solution of Reynold's, energy, conduction and elasticity equations is obtained using finite element method and the equation of motion is computed using fourth order Runga-Kutta method. The results obtained in the present work for nonlinear dynamic analysis of a constant flow valve compensated hole-entry hybrid journal bearing shows a increase in stability margin as compared to linear analysis for a case when isothermal conditions are assumed and bearing is considered rigid. When variation of viscosity with temperature is considered i.e. THS case, the stability margin is found to be about 20% higher than that estimated by linear analysis. Copyright © 2005 by ASME.
Citation: Proceedings of American Society of Mechanical Engineers, Tribology Division, TRIB, (2005), 215- 227. Orlando, FL
URI: https://doi.org/10.1115/IMECE2005-80741
http://repository.iitr.ac.in/handle/123456789/18050
Issue Date: 2005
Keywords: Finite element method
Hybrid bearings
Stability
Thermal effects
ISBN: 0791842339; 9780791842331
Author Scopus IDs: 57203774869
8142901100
23097893400
Author Affiliations: Kumar, V., Department of Mechanical Engineering, Thapar Institute of Engineering and Technology, Patiala, 147 004, India
Sharma, S.C., Department of Mechanical and Industrial Engineering, Indian Institute of Technology, Roorkee, 247 667, India
Jain, S.C., Department of Mechanical and Industrial Engineering, Indian Institute of Technology, Roorkee, 247 667, India
Corresponding Author: Kumar, V.; Department of Mechanical Engineering, Thapar Institute of Engineering and Technology, Patiala, 147 004, India
Appears in Collections:Conference Publications [ME]

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