Surface roughness effects on the static and dynamic behaviour of squeeze film lubrication of short journal bearings with micropolar fluids

2008 ◽  
Vol 222 (2) ◽  
pp. 121-131 ◽  
Author(s):  
N B Naduvinamani ◽  
B Kashinath
Keyword(s):  
Surface Roughness ◽  
Dynamic Behaviour ◽  
Journal Bearings ◽  
Squeeze Film ◽  
Roughness Effects ◽  
Micropolar Fluids ◽  
Film Lubrication

scholarly journals Combined Effects of Viscosity Variation and Surface Roughness on the Squeeze Film Lubrication of Journal Bearings with Micropolar Fluids

2014 ◽  
Vol 9 (4) ◽  
pp. 175-183 ◽  
Author(s):  
Neminath Bhujappa Naduvinamani ◽  
Siddangouda Apparao ◽  
Archana Kamalakar Kadadi ◽  
Shivaraj Nagshetty Biradar
Keyword(s):  
Surface Roughness ◽  
Journal Bearings ◽  
Squeeze Film ◽  
Combined Effects ◽  
Micropolar Fluids ◽  
Viscosity Variation ◽  
Film Lubrication

Effect of surface roughness on couple stress squeeze film lubrication of long porous partial journal bearings

2006 ◽  
Vol 58 (4) ◽  
pp. 176-186 ◽  
Author(s):  
N.M. Bujurke ◽  
N.B. Naduvinamani ◽  
Syeda Tasneem Fathima ◽  
S.S. Benchalli
Keyword(s):  
Surface Roughness ◽  
Couple Stress ◽  
Journal Bearings ◽  
Squeeze Film ◽  
Film Lubrication ◽  
Effect Of Surface

Surface roughness effects on non-Newtonian MHD non-parallel squeeze film bearing

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Mouhcine Mouda ◽  
Mohamed Nabhani ◽  
Mohamed El Khlifi
Keyword(s):  
Surface Roughness ◽  
Peer Review ◽  
Load Capacity ◽  
Homogenization Method ◽  
Squeeze Film ◽  
Squeezing Effect ◽  
Thin Film Lubrication ◽  
Roughness Effects ◽  
Content Type ◽  
Film Lubrication

Purpose The purpose of this paper is to examine the effect of surface roughness on the magneto-hydrodynamic (MHD) non-parallel squeeze film lubrication using non-Newtonian lubricant. Design/methodology/approach Based on the MHD thin film lubrication theory and the Stokes theory and homogenization method, the homogenized MHD Reynolds equation is derived considering the squeezing effect. Findings It is found that the obtained results indicate that the interaction among non-Newtonian, MHD and surface roughness influences is significant. Originality/value This study is original which compares the dimensionless load capacity and dimensionless response time among transverse, longitudinal and, for the first time, anisotropic surface roughness types under magneto-hydrodynamic non-Newtonian non-parallel squeeze film lubrication. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-02-2020-0071/

Application of the Hopf bifurcation theory to limit cycle prediction of short journal bearings with isotropic roughness effects

2007 ◽  
Vol 221 (8) ◽  
pp. 869-879 ◽  
Author(s):  
J-R Lin
Keyword(s):  
Surface Roughness ◽  
Hopf Bifurcation ◽  
Limit Cycles ◽  
Critical Region ◽  
System Parameter ◽  
Journal Bearings ◽  
Roughness Effects ◽  
Critical Limit ◽  
Bifurcation Behaviour ◽  
Bearing System

On the basis of the Christensen stochastic theory, the effects of isotropic surface roughness upon the bifurcation behaviour of a short journal-bearing system are investigated. By applying the Hopf bifurcation theorem to the non-linear equations of motion of rough journal bearings, the steady-state performance, the linear characteristics, and the weakly non-linear bifurcationphenomenaarepresented. For the short bearing with length-to-diameter ratio l = 0. 5, the onset of oil-whirl rough bearing system can manifest a bifurcation behaviour exhibiting subcritical limit cycles or super-critical limit cycles for running speeds near the bifurcation point. For a particular system parameter, the effects of isotropic surface roughness are found to enlarge the size of sub-critical limit cycles and super-critical limit cycles when the Hopf bifurcation occurs. On the whole, the roughness effects of isotropic surface patterns upon the Hopf bifurcation phenomena of the short-bearing system are more pronounced for a smaller system parameter ( p = 0. 4 in the sub-critical region and Sp = 0. 05 in the super-critical region) and a higher roughness parameter (Λ = 0. 4).

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