A Study On The Elastohydrodynamic Lubrication With Spining And Fluid Starvation

Elastohydrodynamic lubrication (EHL) under spinning and starved oil supply conditions was studied mainly in this thesis. Five problems were included, i.e., an analysis of the liquid supply condition in the EHL contacts of human joints; a study of the influence of heat convection on the thermal EHL behavior; an investigation of the influence of spinning on the thermal EHL performance in elliptical contacts; a research of the EHL lubrication when considering both oil starvation and spinning; and, an experiment on the EHL behavior affected by spinning.First of all, the concept of starved lubrication was extended to the spherical coordinate system. A mathematical model was established with spherical coordinates for the starved EHL problem in human joints. Effects of the effective thicknesses of the supplied liquid layers, the applied loads, and the radial clearances on the starved lubrication were investigated.Secondly, the influence of the heat convection on the thermal EHL was studied. The analysis points out that the influence of the heat convection is so small that it can be ignored from the thermal EHL analyses. consequently, the complexity of the problem can be reduced to some extent.Then, the thermal EHL problem with spinning was solved numerically. The influence of spinning with different parameters on thermal EHL was investigated. And, a comparison between the thermal and isothermal results was made.In addition, an efficient algorithm for the EHL with spinning and oil starvation was developed, and the performance of the EHL contacts with different supplied oil layers was discussed. Finally, the spinning experiments were carried out with an optical EHL test rig at different loads and velocities. Meanwhile, the results of numerical simulation were compared with the experiments qualitatively.