scholarly journals The influences of longitudinal surface roughness on sub-critical and super-critical limit cycles of short journal bearings

2014 ◽  
Vol 38 (1) ◽  
pp. 392-402 ◽  
Author(s):  
Jaw-Ren Lin
Keyword(s):  
Surface Roughness ◽  
Limit Cycles ◽  
Journal Bearings ◽  
Critical Limit

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).

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
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