Fatigue Simulation And Experimental Study On Rotational Bending Of Three Generations Of Wheel Bearings

With the upgrading of the automobile manufacturing industry,higher requirements have been put on the wheel bearing unit such as long life,light weight and high integration.These are all high requirements on the performance of the hub bearing,especially the life,in order to improve the stability and safety of the car.The research object of this article is the thirdgeneration hub bearing,the main research contents are as follows:The force analysis of automobile tires was carried out.The load spectra in two states have been formulated reasonably.The axial load and radial load of the bearing were analyzed.According to the Lundberg-Palmgren formula modified by ISO16281,the dynamic load rating is obtained,and the theoretical life of the wheel bearing in two states is calculated.Create a three-dimensional model and simplify it appropriately.Meshfree software Mesh Free was used for static analysis,and the deformation and strain positions were initially obtained.In the dynamic module of ABAQUS,the material parameters,boundary conditions,meshing and other settings of the finite element model are set,and the stress and strain cloud maps of the hub bearing in different states are obtained.The results show that the maximum contact stress is at the contact between the rolling element and the inner and outer rings.Use n Code to simulate the S-N curve of the material,and input the load spectrum and finite element results into n Code.Predict the fatigue life of the bearing,and obtain the life cloud map and damage cloud map of the hub bearing in different states,that is,the numerical simulation of the fatigue life of the hub bearing.Use the rotating bending fatigue test machine,set the parameters according to the designed test method,and carry out the experiment to obtain the test result,and compare and analyze the life of the wheel bearing numerical simulation.The error between the test result and the simulation result is 8.765%.The feasibility of the numerical simulation model is verified.Further processing the test results,fitting first,and then performing reliability evaluation to obtain reliability function graphs under two states to evaluate the reliability of the prediction results.Using the SVM model for life prediction,the accuracy of bearing failure prediction is obtained.Due to the lack of test data,the accuracy is lower than 75%.This is a preliminary exploration of model optimization.