Effects of misalignment on the performance of finite journal bearings lubricated with couple stress fluids

A mathematical model for the hydrodynamic lubrication of misaligned journal bearings with couple stress lubricants is presented. A modified form for Reynolds equation in which the effects of couple stresses arising from the lubricant blended with various additives is used. The journal misalignment is allowed to vary in magnitudes as well as in direction with respect to the bearing boundaries. The flexibility of the bearing liner was incorporated into the analysis by using the thin liner model. A numerical solution for the mathematical model using a finite difference scheme is introduced. The predicted performance characteristics are compared with available theoretical and experimental results. The effects of the degree and angle of misalignment, the length-to-diameter ratio, and the couple stress parameter on static performance such as pressure distribution, load-carrying capacity, friction coefficient, and side leakage flow and misalignment moment are presented and discussed.

[1]  J. Lin.  Static characteristics of rotor bearing system lubricated with couple stress fluids , 1997 .

[2]  R. Sinhasan,et al.  A Study of EHD Lubrication in a Journal Bearing with Piezoviscous Lubricants , 1984 .

[3]  H. D. Conway,et al.  The Analysis of the Lubrication of a Flexible Journal Bearing , 1975 .

[4]  Theo G. Keith,et al.  Development and evaluation of a cavitation algorithm , 1989 .

[5]  Z. S. Safar,et al.  An Adiabatic Solution of Misaligned Journal Bearings , 1985 .

[6]  R. Sinhasan,et al.  A study of steady state and transient performance characteristics of a flexible shell journal bearing , 1988 .

[7]  Teoman Ariman,et al.  Couple Stresses in Fluids , 1967 .

[8]  H. Elrod.  A Cavitation Algorithm , 1981 .

[9]  Oscar Pinkus,et al.  Analysis of Misaligned Grooved Journal Bearings , 1979 .

[10]  Theo G. Keith,et al.  Effect of cavitation on the performance of a grooved misaligned journal bearing , 1989 .

[11]  N. C. Das.  Elastohydrodynamic Lubrication Theory of Line Contacts: Couple Stress Fluid Model , 1997 .

[12]  D. R. Oliver.  Load enhancement effects due to polymer thickening in a short model journal bearing , 1988 .

[13]  S. K. Guha,et al.  Analysis of steady-state characteristics of misaligned hydrodynamic journal bearings with isotropic roughness effect , 2000 .

[14]  W. A. Crosby,et al.  A study of a journal bearing lubricated by fluids with couple stress considering the elasticity of the liner , 1999 .

[15]  G. R. Higginson,et al.  Paper 1: The Theoretical Effects of Elastic Deformation of the Bearing Liner on Journal Bearing Performance , 1965 .

[16]  P. S. Hiremath,et al.  Squeeze film lubrication of a short porous journal bearing with couple stress fluids , 2001 .

[17]  C. J. Hooke,et al.  The Effect of Elastic Distortions on Journal Bearing Performance , 1967 .

[18]  M. Fillon,et al.  An Experimental Investigation of the Effect of Groove Location and Supply Pressure on the THD Performance of a Steadily Loaded Journal Bearing , 2000 .