Study On Dynamic And Friction Characteristics Of High-speed Train Axle Box Bearing

The axle box bearing of the high-speed train shoulders the task of bearing the weight and external force of the vehicle and reducing the running resistance.Therefore,axle box bearings play an important role in the running quality,running safety and dynamic performance of highspeed trains.One of the service performances of axle box bearings is the dynamic characteristics of the internal components.Under the action of aerodynamic load and track excitation,the axle box bearing is in a particularly complex vibration and shock environment,which intensifies the collision frequency and collision contact force between the roller and the cage.On the one hand,the collision of the internal components of the bearing leads to the decrease of the bearing rotation accuracy,which has a significant impact on the running stability of the cage’s center of mass,and accelerates the occurrence of cage damage and raceway defects;On the other hand,under extreme shock loads,the solid contact between the rollers and raceways increases bearing wear and shortens bearing life.Therefore,studying the dynamic and tribological characteristics of high-speed train axle box bearings under service conditions has important theoretical guiding significance for improving the design and operation and maintenance level of high-speed train axle box bearings.The thesis takes the high-speed train axle box bearing as the research object,and studies its dynamics and tribological characteristics.The main work is as follows:(1)Based on NX UG software and MSC ADAMS software,the dynamic model of high-speed train axle box bearing is established and preliminarily verified.(2)The dynamic characteristics analysis of a certain type of highspeed train axle box bearing under stable working conditions is carried out,and the dynamic performance evaluation parameters such as the motion state of the cage center of mass,the roller slip rate,and the cage angular velocity fluctuation ratio under different working conditions are calculated and analyzed.,the effects of axial load,radial load and rotational speed on the motion stability of cage and roller are analyzed.(3)The influence on the high-speed train axle box bearing dynamics characteristics is analyzed through the secondary development of input aerodynamic load and track excitation load spectrum to the high-speed train axle box bearing dynamics model,.(4)The key geometric parameters of high-speed train axle box bearings were edited by NX UG,and the influences of the radial clearance on the dynamic performance of high-speed train axle box bearings were analyzed,which provided optimization suggestions for the design and research of high-speed train axle box bearing.(5)This thesis establishes the typical defects of high-speed train dynamic model of the axle box bearing outer peel is analyzed,the inner ring stripping,stripping roller and cage damaged cases 4 kinds of typical defects such as high-speed train axle box bearing dynamic characteristics,summarizes the typical defects affect the performance of high-speed train axle box bearing dynamics,provide the way of signal processing,The characteristic frequencies of four typical defects were extracted,and the influence of the sliding effect of roller and cage on the characteristic frequencies was analyzed,which provided a reference for the fault diagnosis of high-speed train axle box bearing.(6)Based on the secondary development of MSCADAMS,the roller raceway friction model was established to analyze the effects of lubricating oil viscosity,asperity peak density,asperity peak curvature,roughness standard deviation and roller length on the friction characteristics of contact pair between roller and raceway.93 Figures,10 Tables,111 References...