Thermal effects in hydrodynamic lubrication were recognized as very important since the first wor... more Thermal effects in hydrodynamic lubrication were recognized as very important since the first works in this field. This paper presents the evolution of research concerning thermal effects in hydrodynamic bearings from the first study published by Hirn in 1854. A summary of general thermoelastohydrodynamic theory for the journal bearing case and its comparison with experimental results is then presented.
Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology, 2014
Textured surfaces are the subject of a great deal of research work in tribology, which mainly inv... more Textured surfaces are the subject of a great deal of research work in tribology, which mainly involves numerical studies of lubricated contacts. A variety of shapes and arrangements of textures can be found, these being as numerous as the different authors. Depending on the configuration, it has been shown that the presence of the texture can provide better lubrication efficiency through both a reduction of friction and an increase in load-carrying capacity. However, improving bearing performance implies a specific geometrical configuration for given operating conditions. The improvement in lubricated contact performance by texturing the active surface has been demonstrated using experimental studies concerning, for example, pin-on-disk, mechanical seal, camshaft, journal bearing, thrust bearing, and piston ring set-ups. The objective of the present experimental analysis is to provide, using local measurements, a better understanding of the influence of surface texturing on the stea...
Pad distortions are generally not taken into account for the dynamic study of tilting-pad journal... more Pad distortions are generally not taken into account for the dynamic study of tilting-pad journal bearings. The objective of this paper is both to show the influence of the three-dimensional (3-D) pad deformations due to the pressure field on the bearing response and to analyse the bearing behavior for various unbalance eccentricities. Similar orbits are obtained using 2-D or 3-D pad deformations; however, due to the axial profile of the film thickness, the minimum film thickness obtained with the 3-D model is about 40 percent lower than the one obtained with the 2-D model for the greatest unbalance eccentricity. The maximum pressure is decreased by about 16 percent when the 3-D model is used but that value is nearly similar to the one obtained without deformation. The dynamic behavior of the bearing is largely modified when the dynamic load is greater than the static load.
The journals bearing characteristics with texture presence on the bearing surface are investigate... more The journals bearing characteristics with texture presence on the bearing surface are investigated. The thermal effect has been studied. The used numerical approach in this analysis is Finite Difference Method. The textured bearing performance enhancement passes essentially by a minimum film thickness and a friction torque improvement through an appropriate surface texture geometry and right texture distribution on the bearing surface. It is found that the simulation results are in good concordance with those issued from the litterature. The obtained results by considering the temperature effect are more realistic.
Thermal effects in hydrodynamic lubrication were recognized as very important since the first wor... more Thermal effects in hydrodynamic lubrication were recognized as very important since the first works in this field. This paper presents the evolution of research concerning thermal effects in hydrodynamic bearings from the first study published by Hirn in 1854. A summary of general thermoelastohydrodynamic theory for the journal bearing case and its comparison with experimental results is then presented.
Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology, 2014
Textured surfaces are the subject of a great deal of research work in tribology, which mainly inv... more Textured surfaces are the subject of a great deal of research work in tribology, which mainly involves numerical studies of lubricated contacts. A variety of shapes and arrangements of textures can be found, these being as numerous as the different authors. Depending on the configuration, it has been shown that the presence of the texture can provide better lubrication efficiency through both a reduction of friction and an increase in load-carrying capacity. However, improving bearing performance implies a specific geometrical configuration for given operating conditions. The improvement in lubricated contact performance by texturing the active surface has been demonstrated using experimental studies concerning, for example, pin-on-disk, mechanical seal, camshaft, journal bearing, thrust bearing, and piston ring set-ups. The objective of the present experimental analysis is to provide, using local measurements, a better understanding of the influence of surface texturing on the stea...
Pad distortions are generally not taken into account for the dynamic study of tilting-pad journal... more Pad distortions are generally not taken into account for the dynamic study of tilting-pad journal bearings. The objective of this paper is both to show the influence of the three-dimensional (3-D) pad deformations due to the pressure field on the bearing response and to analyse the bearing behavior for various unbalance eccentricities. Similar orbits are obtained using 2-D or 3-D pad deformations; however, due to the axial profile of the film thickness, the minimum film thickness obtained with the 3-D model is about 40 percent lower than the one obtained with the 2-D model for the greatest unbalance eccentricity. The maximum pressure is decreased by about 16 percent when the 3-D model is used but that value is nearly similar to the one obtained without deformation. The dynamic behavior of the bearing is largely modified when the dynamic load is greater than the static load.
The journals bearing characteristics with texture presence on the bearing surface are investigate... more The journals bearing characteristics with texture presence on the bearing surface are investigated. The thermal effect has been studied. The used numerical approach in this analysis is Finite Difference Method. The textured bearing performance enhancement passes essentially by a minimum film thickness and a friction torque improvement through an appropriate surface texture geometry and right texture distribution on the bearing surface. It is found that the simulation results are in good concordance with those issued from the litterature. The obtained results by considering the temperature effect are more realistic.
Uploads
Papers by Michel Fillon