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Capacity forces in slide journal bearing for laminar, unsteady lubrication

Krasowski P.

Journal of KONES

2006

Vol. 13, No. 2

241-248

The paper presents the results of numerical solutions modified by the Reynolds equation of laminar unsteady lubrication of a cylindrical slide journal bearing. The particular solutions are limited to isothermal models of bearing with infinite length, lubricated by Newtonian oil with the dynamic viscosity dependent on pressure. The disturbances are related with unsteady velocity of oil flow on the sleeve and on the journal. The results are shown in the diagram of hydrodynamic pressure and capacity forces in the dimensionless form in time intervals of displacement duration. In particular modified Reynolds equation and hydrodynamic pressure, capacity forces and numerical results are presented in the paper. The results confirm that the perturbation of velocity influence is stronger when the oil viscosity depends stronger on pressure. Summary pressure and perturbation pressure change are periodical equal to perturbation of velocity period and the size of change depends on perturbation of velocity. When the perturbation of velocity on the pin has the same direction as peripheral velocity of the pin, the perturbation pressure is positive. When the peripheral velocity is in the opposite direction, the perturbation pressure is negative and it decreases summary pressure. Pressure increase and decrease are not symmetrical during the perturbation time. Presented results will going to be used as a comparison quantities in case of laminar unsteady flow of Non-Newtonian fluids in cylindrical bearing gap.