Nonlinear Dynamic Stability Analysis of Flexibly Supported Finite Oil Journal Bearings with Variable Viscosity Including Bearing Liner Surface Deformation

Nonlinear Dynamic Stability Analysis of Flexibly Supported Finite Oil Journal Bearings with Variable Viscosity Including Bearing Liner Surface Deformation

  IJETT-book-cover  International Journal of Engineering Trends and Technology (IJETT)          
  
© 2017 by IJETT Journal
Volume-48 Number-3
Year of Publication : 2017
Authors : Manoj Kundu, S.K Mazumder, M.C Mazumdar
DOI :  10.14445/22315381/IJETT-V48P222

Citation 

Manoj Kundu, S.K Mazumder, M.C Mazumdar "Nonlinear Dynamic Stability Analysis of Flexibly Supported Finite Oil Journal Bearings with Variable Viscosity Including Bearing Liner Surface Deformation", International Journal of Engineering Trends and Technology (IJETT), V48(3),120-129 June 2017. ISSN:2231-5381. www.ijettjournal.org. published by seventh sense research group

Abstract
This paper analyses the stability characteristics of a rigid rotor mounted in flexibly supported hydrodynamic finite oil journal bearings considering pressure depended viscosity including the effect of elastic distortion on the surface of bearing liner. This theoretical analysis is intended to show how the effect of elastic distortion along with the flexible support on the journal bearing performance considering pressure depended viscosity, which can be calculated for three-dimensional bearing geometries. The deformation equations for bearing surface will be solved simultaneously with hydrodynamic equations considering variable viscosity. A Non-linear time transient method is used to simulate the journal and bearing centre trajectory and thereby to estimate the stability parameter. In this analysis forth order Runge-Kutta method is used to determine the locus of the journal and the bearing centre for the various operating conditions. The stability of the system is determined from the combined stability effect in journal and bearing centre. It has been found that stability decreases with increase of the elasticity parameter of the bearing and stability improves with increase of the viscosity parameter.

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Keywords
Journal bearing, surface deformation, variable viscosity, eccentricity ratio, Reynolds equation.