Research And Software Realization On Single-row Tapered Roller Bearing Dynamic Simulation

The single-row tapered roller bearing(STRB)plays the key role in the high-speed rail bearing box,whose performance directly affect the work efficiency and service life of the entire mechanical system.Nowadays,the domestic high-speed railway is developing rapidly,while the key technology of high-speed rail bearing has not meet the standard,and high-speed rail bearings still rely on imports.How to realize the localization of high-speed rail bearing is still the ’ containment ’ problem of domestic industrial development.Meanwhile the mainstream bearing analysis software is basically from abroad,and the domestic software strength is weak.The development of software for high-speed rail bearing analysis has become the top priority to realize the positive design of domestic bearings.Therefore,the present thesis,supported by the relevant projects of the Ministry of Science and Technology and the National Natural Science Foundation of China(Project Number: 52175160),carries out the theoretical and simulation research on time-varying comprehensive stiffness and damping,bearing dynamic performance and bearing temperature field of STRB.On this basis,a dynamic simulation and comprehensive analysis software of high-speed rail bearing is developed,which has been preliminarily applied to the analysis of STRB made in Zhongzhe High-Speed Railway bearing Company.The main works and conclusions are as follows:Firstly,based on Hertz contact theory and elastohydrodynamic lubrication principle,a time-varying comprehensive contact stiffness and damping calculation model is established,which considers contact deformation and hydrodynamics pressure effect.The stiffness and damping of lubricant can be updated continuously according to changes in the contact load and entrainment velocity in the current area,so that the contact situation of the bearing is closer to the engineering practice.Secondly,the C++ program of the above stiffness and damping calculation model is embed into the ADAMS dynamic simulation by the dynamic link library(DLL).Based on the DLL,a dynamic simulation model of STRB is established and verified by experiments.Through the simulation,effects of working parameters and structural parameters on the bearing stiffness and damping,vibration characteristics and cage stability are revealed,and effects of the temperature on dynamic characteristics of the bearing is indirectly demonstrated through thermal correction factor.Thirdly,in order to more accurately understand the influence of working condition parameters upon the bearing temperature field,a thermal network model is established.The model calculates the heat generation by the overall method,reveals the effect of working parameters on the bearing temperature distribution.Compared with the results of finite element steady-state thermal analysis model,the correctness of the thermal network model is verified.Finally,based on the above research,a dynamic simulation analysis software of STRB is developed.The cumbersome dynamic modeling process is embedded into the software interface in the form of macro commands,and many kinds of dynamic link libraries are compiled to enrich the analysis function of Adams.This software can output the calculation results of Adams including motion state and stress condition,as well as the solution results of external dynamic link libraries such as temperature distribution,rated life,oil film thickness,stiffness and damping.