Research On Dynamic Performance Analysis Technology And System Of Rolling Bearing Based On Pseudo-statics

With the development of science and technology,high-end equipment such as shield tunneling machines,high-performance medical instruments and aero-engines have increased demands on rolling bearings,and the performance requirements on all aspects of bearings are becoming more and more demanding.As the key parts of the whole mechanical equipment operation system,the dynamic performance of rolling bearings directly affects the safety and reliability of the whole equipment operation,so it is very necessary and urgent to analyze the dynamic performance of bearings.In this paper,the geometric parameters of bearings,the main curvature,contact Angle and axial clearance of the contact point between the rolling body and the raceway were firstly analyzed.By studying the motion of the rolling body under medium and low speed working conditions and high speed working conditions,the rotational velocity and rotation velocity of the rolling body under these two working conditions and the ball velocity vector joint of the rolling body under high speed operating conditions were deduced.Considering the combined effects of axial,radial and torque loads,the static model of the bearing at low and medium speed was established,and the relative displacement and contact Angle of the inner and outer rings of the bearing were calculated.Based on raceway control theory,a pseudo-statics model of high-speed rolling bearings was established,and Levenberg-Marquardt algorithm was used to solve the nonlinear equations of the pseudo-statics model,which effectively avoided the problem of slow initial convergence of the traditional Newton-Raphson method.The simulation results between the comparative statics model and the mature Romax software on the market were used to verify the accuracy of the model.Based on the model,the influences of the groove curvature coefficient,the initial contact Angle and the number of rolling elements on the bearing contact load were analyzed.Analyze and compare different calculation methods of load deformation coefficient when rolling body and raceway contact and contact type when rolling body and raceway contact,establish contact load analysis model and contact stress analysis model of rolling bearing based on Hertz contact theory.It is used to calculate the raceway contact load,contact deformation,contact stress and the long and short semi-axis of the contact ellipse in the performance analysis of rolling bearings.The calculation results of the model are compared with the simulation results of Romax software.The error of each contact parameter is within3%,which verifies the accuracy of the calculation model.Based on the fatigue life model of internal load distribution of rolling bearings,fatigue damage accumulation hypothesis fatigue life model and ISO standard fatigue life model,the interpolation method of dynamic load coefficient of rolling bearings in ISO standard was studied.Examples were analyzed for different types of bearings,and the calculated results were compared with the simulation analysis results of Romax software.The error of fatigue life is less than 5%,which proves the validity of the fatigue life model.Based on the empirical model of friction torque and SKF friction torque model,the variation rule of bearing friction torque under different coaxial forces and rotational speeds was explored.The calculation results of the two models were compared with the simulation results of Romax software.It was found that the results of the empirical model of friction torque were closer to the simulation values of Romax.By comparing the calculated results with the Romax simulation results,the error of friction torque is less than 4%,which confirms the validity of the friction torque model.Based on the effective analysis of the above dynamic performance of rolling bearings,the dynamic performance analysis system of rolling bearings was developed in the UG environment,combined with the programming functions of Visual Studio and Matlab,based on the form file to achieve the storage of analysis and calculation data,read and save the final analysis results.Using UG UI to build the interface of the analysis system,combined with the established dynamic performance analysis model,the rolling bearing contact load,contact stress,fatigue life and friction torque four dynamic performance analysis,show the data storage form and naming format,give four dynamic performance analysis results,results have good readability.The system shortens the time of bearing dynamic performance analysis and improves the analysis efficiency.