A study of mixed lubrication parameters of journal bearings
02 Jan 1993-Wear (Elsevier)-Vol. 160, Iss: 1, pp 111-118
Abstract: Different parameters applicable to journal bearings operating under mixed lubrication conditions have been identified. These parameters are the minimum eccentricity ratio corresponding to the onset of mixed lubrication, the range of mixed lubrication and the maximum probability of asperity interaction. Salient features pertaining to these parameters have been discussed. A numerical method for computation of the pressure distribution under mixed lubrication conditions considering the roughness profile of peak heights has been presented. The results of the analytical work have been illustrated using experimental data.
01 Jan 1998-
01 Jun 2002-Tribology International
Abstract: The increasingly high demands for compact design require journal bearings to work under severe operating conditions. A steady-state mixed-TEHD (thermo-elasto-hydrodynamic) model for journal bearings has been developed. The model considers the fluid flow in the gap formed by rough surfaces, asperity contact, surface thermoelastic deformations, and a temperature–pressure–viscosity relationship for the lubricant, as well as an angular misalignment between the journal and the bearing. The model is verified with experimentally measured temperature data. Numerical simulations of the operation of a typical journal bearing are conducted and the importance of several contributing factors in mixed lubrication is discussed. A bearing temperature transition has been experimentally identified and numerically analyzed.
01 Apr 1998-Journal of Tribology-transactions of The Asme
Abstract: Investigation of the mixed lubrication of journal-bearing conformal contacts is very important for failure prevention and design improvement. This paper studies the asperity contact in heavily loaded journal bearings with Lee and Ren's asperity contact theory in a newly developed mixed-TEHD (Thermal Elasto-Hydro-Dynamic) model and analyzes the performance of simulated journal bearings under high eccentricity ratios. The effects of operating conditions, bearing structures, and thermal conditions on the contact severity were numerically investigated. The results indicate that the asperity contact pressure and the performance of journal bearings in the mixed lubrication are strongly affected by the geometric design and the thermal-elastic deformations. The heat transfer of the bearing-lubricant-journal system was also shown to play a role.
01 Dec 1997-
01 Dec 1996-
Abstract: Numerical analyses of finite journal bearings operating with large eccentricity ratios were conducted to better understand the mixed lubrication phenomena in conformal contacts. The average Reynolds equation derived by Patir and Cheng was utilized in the lubrication analysis. The influence function, calculated numerically using the finite element method, was employed to compute the bearing deformation. The effects of bearing surface roughness were incorporated in the present analysis for the calculations of the asperity contact pressure and the asperity contact area. The numerical solutions of the hydrodynamic and asperity contact pressures, lubricant film thickness, and asperity contact area were evaluated based on a simulated bearing-journal geometry. The calculations revealed that the asperity contact pressure may vary significantly along both the width and the circumferential directions. It was also shown that the asperity contacts and the lubricant film thickness were strongly dependent on the bearing width, asperity orientation, and operating conditions.
H. Christensen1•Institutions (1)
01 Jun 1972-
Abstract: The phenomena observed when a lubricated contact or bearing is operating under mixed lubrication conditions are assumed to arise from an interaction of the surface asperities or roughness as well a...
01 Mar 1974-Wear
Abstract: It is shown that if one of the two moving contact surfaces is either rough or deformed and thus cannot be assimilated to a plane, Reynolds equation takes on a different form which is not equivalent to the classical equation. Sliding velocities are shown in this case to be determinant.
01 Jan 1981-
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