Tribological Study Of Liner Spherical Plain Bearing

As a kind of high precision bearing,liner spherical plain bearing is widely used in hydraulic machinery,heavy truck,national defense machinery and aviation industry,especially in landing gear of aircraft.The tribological performance of liner spherical plain bearing directly affects the working performance and reliability of landing gear.With the rapid development of domestic aviation industry,as an important part of aircraft landing gear,the liner spherical plain bearing has received more and more attention.By now,the research of liner spherical plain bearing at home and abroad is mostly limited to separate bearing experiments or simulation analysis.There is no comprehensive research on the analysis of liner parameters,bearing static performance and wear performance.Therefore,starting from the calculation of the elastic parameters of the pad,this paper simulates the actual working conditions,and conducts the static simulation,thermal mechanical coupling simulation and wear simulation of the liner spherical plain bearing,in order to study the tribological characteristics of the liner spherical plain bearing,and then can be used to guide and compare the bearing experiments.Part 1 described the engineering significance of research on liner spherical plain bearing,and the research progress in three aspects of liner elastic parameter calculation,static and thermal mechanical coupling simulation and wear simulation at home and abroad is summarized.Finally,the main content of this paper is proposed.In part 2,according to the characteristics of the present research on the calculation of elastic parameters of the liner,such as the big difference between the mesoscopic geometric model of the liner and the actual one,and the calculation results of the constitutive model used at present are not consistent with the experimental results,the improved mesoscopic models of the liner feature element are proposed,and the bridge model is used to calculate the elastic parameters.The calculation process of the elastic parameters of liner is described in detail from three aspects: the mesoscopic geometric model of liner characteristic volume element,the calculation model of liner elastic parameters and the comparison between calculation results and experiments.In part 3,the methods,steps and results of static and thermal coupling simulation of liner spherical plain bearing in normal and inclined position are described.The simulation results are compared and analyzed comprehensively.In part 4,starting from the wear theory analysis of liner spherical plain bearingd,the different wear stages of pad are divided,and the calculation method of elastic parameters in each stage is given.Using the user subroutine umeshmotion of ABAQUS,the wear of liner spherical plain bearing is simulated and analyzed.And the relationship between the number of oscillation of bearing and the wear depth of liner is obtained.Based on the above inference,the bearing life can be predicted roughly,which has certain reference value for the life test of liner spherical plain bearing.Part 5 summarized the major work in this thesis and proposed other crucial issues that require future research endeavor.