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Technical Briefs

Stabilization of Journal Bearing Using Two-Layered Film Lubrication

[+] Author and Article Information
T. V. V. L. N. Rao

 Mechanical Engineering Department, Universiti Teknologi PETRONAS, 31750 Tronoh, Perak Darul Ridzuan, Malaysiatvvlnrao@gmail.com

J. Tribol 134(1), 014504 (Feb 24, 2012) (5 pages) doi:10.1115/1.4005650 History: Received June 20, 2011; Revised November 16, 2011; Published February 21, 2012; Online February 24, 2012

The purpose of this paper is to present the linearized stability analysis of two-layered fluid film in the journal bearing. In this work, a modified classical Reynolds equation is derived under dynamic conditions consisting of two layers of fluid film described by Newtonian viscosities. The magnitude of lubricant layer’s film thickness and viscosities are taken into consideration. The Reynolds boundary conditions are used in the analysis of classical one-dimensional journal bearing to predict the stiffness and damping coefficients, threshold speed and critical whirl frequency ratio. The coefficients of load capacity, threshold speed, and critical whirl frequency ratio (Cw , Cω, CΩ) for two-layered film with reference to homogeneous film are computed as a function of the two parameters: (i) higher to lower dynamic viscosity ratio of two-layered fluid film (β), and (ii) thickness ratio of fluid layer attached to journal and bearing (γ). Higher threshold speed is obtained for thick high viscosity fluid film attached to the bearing surface and a thin low viscosity fluid film attached to the journal surface.

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Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 1

Two-layered journal bearing (configuration 1)

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Figure 2

Load capacity coefficient

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Figure 3

Threshold speed coefficient

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Figure 4

Critical whirl frequency ratio coefficient

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