PRESSURE AND VELOCITY DISTRIBUTION IN A SLIDE JOURNAL BEARING GAP BY LAMINAR UNSTEADY LUBRICATION
Journal Title: Tribologia - Year 2009, Vol 228, Issue 6
Abstract
This paper shows the results of numerical solutions of modified Reynolds equations for laminar unsteady oil flow in the slide journal-bearing gap. Laminar unsteady oil flow is performed during periodic and non-periodic perturbations of bearing load or is caused by the changes of gap height in time. Above perturbations occur mostly during the starting and stopping of the machine. During modelling crossbar-bearing operations in combustion engines, bearing movement perturbations from engine vertical vibrations causes velocity flow perturbations of lubricating oil on the bearing race and on the bearing slider in the circumferential direction. This solution example applies to an isothermal bearing model with infinite length. Lubricating oil used in this model has Newtonian properties and constant dynamic viscosity. Perturbations connected with unsteady lubricating oil velocity in the circumferential direction on the slide bearing and on the slider of bearings were taken into consideration. This article also analyses pressure and velocity distributions in the bearing in the time function during the perturbation. Results are presented in the dimensionless hydrodynamic pressure and velocity distribution diagrams. Diagrams also present the velocity change during the moment of perturbations. Velocity position during perturbation was also analysed. Received solutions were compared with the solution received by the stationary lubrication flow in the slide journal bearing, which were made with the same parameter assumption by constant dynamic oil viscosity. The isothermal bearing model is similar to the friction node model by steady-state heat load conditions.<br/><br/>
Authors and Affiliations
Paweł Krasowski
Keywords
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