Thermal–structural Coupling Analysis Of High Speed Train Axle Box Bearing

Under the development trend of high speed and heavy load,the axle box bearing is one of the important core components of the train bogie,and at the same time bears a large radial load and a certain axle box load,making it one of the easily damaged parts.Common failures of axle box bearings include peeling of bearing rolling elements or inner and outer raceway surfaces,burns and wear,and plastic deformation.The cause of the above failures is the excessive temperature and stress concentration caused by the friction and collision inside the axle box bearing during the train operation.In order to understand the temperature and stress distribution of the axle box bearing under extreme conditions,this paper takes theA high-speed EMU SKF axle box bearing as the research object,and performs a thermal-structure coupling analysis on the axle box bearing.The research work mainly includes the following four parts:(1)Three-dimensional modeling of SKF bearings and assembly of various parts of the box,analysis of the structural characteristics of the axle box bearings and radial and axial loads,according to the rolling bearing load distribution theory,comparing the differences in different load calculation methods and passing The finite element statics calculation determines the appropriate load distribution calculation method.(2)Use tribology and heat transfer theory to analyze the heat generation of SKF bearings,calculate the power loss and heat transfer boundary conditions of axle box bearings,compare the differences between different heat calculation methods,combine the finite element steady-state temperature field calculations and trains The driving experiment data determines a reasonable calculation method.(3)Use ANSYS finite element analysis software to perform analysis.Solve the steady-state temperature field of the system in the steady-state thermal analysis module,and then import the temperature analysis results into the structural static analysis module to obtain the system's combined effect of thermal stress and structural stress.Under the stress distribution,determine where the maximum stress occurs,and analyze the cause of stress concentration.(4)The logarithmic modification method is used to modify the straight busbar cylindrical rollers,and the contact stress under different modification amounts is solved.A reasonable modification amount is determined to solve the problem of boundary stress concentration at both ends of the rolling bearing roller.In summary,this paper combined theoretical calculations and finite element simulation calculations to determine the load and temperature distribution of highspeed trains under extreme conditions.Using logarithmic modification to solve the problem of stress concentration at both ends of rolling bearing rollers,determined Reasonable amount of modification.The research results have certain engineering application value for the localization of high-speed train axle box bearings and improving the safe and stable operation of trains.