汽车前悬结构件耐久性分析及优化
Durability Analysis and Optimization of Car Front Suspension Structure

为了准确预测汽车前悬结构件的耐久性，建立了前悬系统有限元模型，采用路试实测载荷的极限值对有限元模型加载进行强度分析，采用路试实测动态载荷对前悬系统有限元模型进行疲劳分析。强度分析结果表明整车在过坑工况下前悬筒壁的最大应力位置和应力值都与试验完全吻合；疲劳分析结果也表明弯曲处疲劳损伤严重。以上分析证明了采用前悬系统有限元的强度分析和疲劳分析能够有效预测前悬结构件的耐久性。在前期没有实测载荷的情况下，采用相关路谱载荷的极限值进行强度计算能够有效预测出耐久性问题。通过对前悬臂筒设计优化，发现提升材料性能比增加壁厚效果更明显，减小衬套刚度会引起减小载荷，但作用有限。
In order to predict the durability of car front suspension structure, a finite element model was built, the strength with the maximum load of real road spectrum was analyzed and the durability with the dynamical real road spectrum was analyzed. By contrast, the maximum stress value and the position of the vehicle are fully consistent with the experimental result, fatigue analysis also showed severe fatigue damage. The example shows the strength and fatigue analysis with finite element can predict the durability of front suspension structural parts. In the early days no actual load conditions, with correlation road load maximum, the strength analysis can predict the durability. Finally, to optimize front suspension structure design showed that to enhance the material properties was more pronounced than to increase the thickness. There are not obvious improvement by reducing the bushing stiffness