Elastohydrodynamic Lubrication Analysis For High Speed And Low Viscosity Rough Surface Of Journal Bearing

With the speed of journal bearings in various machines is getting higher and higher,it is more important to research the working performance of journal bearings under high speed and low viscosity.However,many of the previous researches are based on some assumptions about bearing simplification,such as assuming that the journal and bearing surfaces are smooth and the bearings and journals are rigid and do not deform.Therefore,this paper analyze the hydrodynamic lubrication in view of surface morphology and elastic deformation.In this paper,the influence of surface morphology and elastic deformation on the lubrication performance of journal bearings is calculated by using the fuel pump sliding bearing in an internal combustion engine as the research object.The main contents of this paper are as follows:1.Considering the influence of elastic deformationThe analysis model of journal bearing established by using ANSYS finite element method,got the thermal deformation-matrix and elastic deformation of node according to the joint of the node pressure of lubricant film and thermal deformation-matrix.2.Considering the impact of surface roughness on bearing lubricationUsing the turbulence theory model considering the surface morphology and joint Mass conservation algorithm,analyzing the change of bearing lubrication performance under the condition of not considering surface roughness and the surface roughness is constantly changing.3.The effects of elastic deformation and surface morphology were studied comprehensivelyOn the basis of the first and the second chapters,considering the impact of elastic deformation and surface roughness on bearing lubrication performance and compared with the case which considering elastic deformation or surface roughness alone.Analyzing the impact on bearing lubrication performance when considering them comprehensively.