Experiment And Theoretical Study On The Lubrication Performance Of Slide Bearing Under The Accelerated Phase

Thrust bearings are widely used in Hydraulic and Hydro-Power Engineering,shipbuilding industry, aerospace and other fields. It is mainly used to bear the load which isfrom the axial direction. In this paper, slider bearing was taken as the research object. The oilfilm thickness was measured by two displacement sensors. Some sliders thrust bearinglubrication properties were obtained and different thrust bearing pad surface were simulated.Based on studying the factors of the slider bearings, that can provide certain referencesignificance for the thrust bearing structure and surface shape design.Measurement of oil film thickness is an important content in the research on thelubrication performance of thrust bearing. In this paper, the oil film thickness was measuredby two displacement sensors; this way can effectively reduce the error caused by the vibrationof the system, compared with the single sensor, the two sensors had a better accord with thetheoretical calculation results.By fluid dynamics theory, infinite wedge slider mathematical model was established toanalyze the relationship between the film thickness, the friction coefficient and the gap ratio,the theoretical calculation results are verified by experiment. The calculation results show thatthe oil film thickness increases with the increase of speed, the friction coefficient was onlyrelated to the gap ratio. In the accelerated phase, the influence of inertia force can not beignored, in the derivation of the pressure distribution, the influence of inertial force wasconsidered. The effects of the acceleration that was raised by inertial forces on the bearingcarrying capacity were analysised theoretically. The slider bearing oil film thickness andfriction coefficient were experimentally validated in the acceleration phase. The results showthat the inertial forces of acceleration can reduce the carrying capacity of the bearing, thereduction of carrying capacity was greater with the acceleration was bigger. In the bearingacceleration phase, the oil film thickness was not stable, and the overall average is less than the stable operation of the stage, the coefficient of friction in the acceleration phase waslarger.Finally, the three-dimensional film modeling was established by PROE and then themodel was imported into finite element simulation software Workbench and meshed. Themodel finally was simulated and calculated by Fluent. Different types of surfaces thrust padwere simulated; ultimately by comparison, the convex shape was better for the oil filmformation and the maximum carrying capacity. Using Matlab fit thrust tile surface and the tilesurface different equation parameters was analyzed and compared; we found that with thegradual increase in surface equation parameters, the film pressure increase and thendecreases.