电动汽车转向节有限元分析及其形状优化

The Electric Vehicle Steering Knuckle Finite Element Analysis and Structure Optimization

针对某型电动汽车转向节有限元分析及其形状优化问题,利用ANSYS Workbench对转向节进行静力学分析、模态分析、疲劳分析和瞬态动力学分析并优化。优化结果表明,转向节最大应力由749MPa降低至594MPa、安全系数由1.05提高至1.32,最低疲劳寿命系数由774.4提高至1658,转向节最低阶固有频率为3610.4Hz,远高于路面以及车轮不平引起的振动频率,有效避免共振。瞬态动力学分析结果与静力学分析结果经过多次比较发现没有明显差别,表明静力学分析从某种程度上可以有效代替瞬态动力学分析,节约分析时间。

Aiming at the finite element analysis and shape optimization of steering knuckle of an electric vehicle,the static analysis,modal analysis,fatigue analysis and transient dynamic analysis of steering knuckle are carried out and optimized by ANSYS Workbench.The results show that the maximum stress of the steering knuckle reduced from 749MPa to 594MPa,the safety factor was increased from 1.05 to 1.32,the minimum fatigue life coefficient of the steering knuckle increased from 774.4 to 1658.The lowest natural frequency of steering knuckle is 3610.4Hz,which is much higher than the vibration frequency caused by uneven road surface and wheels,avoiding resonance effectively.Transient dynamic analysis and static analysis results showed no obvious difference,which shows that statics analysis can effectively replace transient dynamics analysis to some extent and save analysis time.