汽车车架载荷强度优化设计仿真

Loading Strength Optimization Design Simulation of Automobile Frame

为了某汽车车架的各项静动态特性是否都满足设计,针对车架强度载荷的准确获取问题,建立整车多体动力学刚柔耦合模型提取其动态载荷,并且基于有限元方法和惯性释放方法对车架进行强度仿真分析,各个工况下的车架能够满足强度要求。采用有限元方法对其进行模态仿真分析,前五阶模态频率均有效地避开了车架下结构的固有频率和发动机怠速的激励频率,将会有效避免发生共振。刚度仿真分析结果表明,弯曲刚度和扭转刚度均满足设计要求。仿真分析结果表明上述汽车车架的各项静动特性均满足设计要求。

In order to verify the static and dynamic characteristics and obtain the accurate load of an automobile frame, a multi-body dynamics rigid-flexible coupling model of the vehicle is established and the dynamic load is ex- tracted, the strength of the frame is analyzed base on inertia relief method and finite element method. The modals of the frame are simulated and analyzed based finite elements, and the results show that the first five free modals effec- tively avoid the natural frequency of the frame structure and the excitation frequency of engine idle speed, so the reso- nance can be effectively avoided. The stiffness analysis results show that the bending stiffness and the torsional stiff- ness as well as the static and dynamic characteristics of the frame meet the design requirements.