| The third generation wheel hub bearing is one of the most important parts of the car. Due to itsnovel structure, poor working conditions and widely usage, carrying out its mechanical propertyanalysis and optimization design is of great significance.Firstly, static analysis of wheel hub bearing is conducted. Geometric model is created by Catia.And the finite element model is established by Hypermesh based on the actual cornering conditionmodel of wheel hub bearing. And mechanical properties of wheel hub bearing can be calculated byAnsys. Then, the simulation results are compared with the results tested by rigid torque testingmachine. It verifies the correctness of the finite element model. And the mechanical properties of thewheel hub bearing are accurately predicted.Based on the static analysis, explicit dynamic analysis of wheel hub bearing is carried out in lowspeed working condition by Ansys/Ls-dyna. The stress field, velocity field and acceleration field arestudied under this condition. And the simulation results are compared with the analytical solution toverify its correctness. Based on the above study, wheel hub bearing’s dynamic characteristics arecompared in the low-speed, medium-speed and high-speed conditions. And the influences to the fieldsare analyzed.At last, multi-objective optimization for the third generation wheel hub bearing is conducted.Fatigue life, abrasion life and spin roll ratio are considered as the optimization targets. And theoptimum design model is established. Penalty function is introduced to deal with constraints.Multi-objective optimization design is calculated by NSGA-II. The performances of wheel hubbearing have been improved in different degrees. Finally, through the finite element analysis, thestress and deformation of the pre-optimization structure are compared with the optimization one toverify the correctness of optimization. |
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