Study On Lubrication Performance Of Sliding Bearing Under Dynamic Load Conditions

Sliding bearings are important components in mechanical equipment,and their lubrication performance has an important impact on the operating efficiency and life of the applied equipment.Poor lubrication of sliding bearings often leads to increased bearing wear,which in turn affects the stability and reliability of the equipment.In practice,the load on the sliding bearing is usually dynamic,and has a variety of complex working conditions.Therefore,in order to more accurately assess the lubrication performance of sliding bearings,to gain an in-depth understanding of the changes in lubrication performance under dynamic loads,and to better understand the wear mechanism of dynamic loads on sliding bearings so as to optimize the bearing lubrication scheme,the effect of dynamic loads on their lubrication performance needs to be studied separately.In this thesis,the simulation model of sliding bearing is established,the fluid-structure coupling calculation of the simulation model of sliding bearing is carried out by UDF compilation,and the half-sine and compound-sine dynamic loads are applied to it respectively,and the change law of lubrication performance of sliding bearing with dynamic load is obtained,and the effects of amplitude and direction of dynamic load and journal speed on the lubrication performance of sliding bearing are analyzed.The purpose of this thesis is to study the lubrication performance of sliding bearings under dynamic load conditions,which can provide a deeper understanding of their working mechanism,provide a more scientific basis for the safe operation of sliding bearings under severe operating conditions,and provide some reference for the development of sliding bearing lubrication technology.The main research contents and results of the thesis are as follows:(1)Based on fluid lubrication theory,CFD method and oil film dynamics,the simulation model of sliding bearing is established,and the fluid-solid coupling simulation calculation of sliding bearing system is realized by UDF compilation.(2)The lubrication test was conducted on the sliding bearing test rig,and the simulation model of the rig was established,and the fluid-solid coupling calculation was performed on the rig model.(3)Using the validated fluid-solid coupling calculation method,simulations are performed for the sliding bearing model by applying half-sine dynamic load and composite sinusoidal dynamic load respectively.By varying the dynamic load amplitude,direction and journal speed,the calculated results of lubrication performance parameters such as maximum oil film pressure,minimum oil film thickness and journal trajectory are analyzed in the time domain to reveal the variation law of lubrication performance with the load amplitude,direction and journal speed.(4)The mathematical model of sliding bearing is established by the theory related to fluid lubrication,and the numerical calculation of lubrication is carried out in Visual Studio software.The numerical calculation result of lubrication is compared with the calculation result of fluid-solid coupling,and the accuracy of the simulation result of fluid-solid coupling of sliding bearing is verified in this thesis.