基于有限元分析的某MPV车前副车架改进设计

MPV Front Sub-frame Structure Improvement Based on The Finite Element Analysis

结合有限元分析法,对某MPV车改进前的整体式加强杆结构和改进后的的断开式加强杆结构的副车架进行实车转弯和制动工况下的刚度、应力及模态对比分析。仿真结果表明:驱动力和制动力工况下改进后的副车架所受应力均比改进前副车架所受应力值小;改进后副车架结构在刚度上优于原改进前结构的刚度,改进后副车架模态频率比改进前副车架模态模态变化较小。预测改进后的副车架结构改进设计能够满足新车使用要求。

Applying the finite element method, the front sub-frame for the multi-purpose vehicle is analyzed on the cornering and braking conditions. The calculated rigidity, stresses and natural modes are compared between the original front sub-frame structure with the connected reinforcing rod and the new designed front sub-frame structure, with the disconnected reinforcing rod. The results show that the stress of the new designed sub-frame is lower than that of the original front sub-frame on the cornering and braking condition; the stiffness of the new front sub-frame structure is higher than that of the original sub-frame structure; the modal frequencies of the new designed front sub-frame structure is almost the same as those of the original sub-frame structure. It is predicted that the improved design for the sub-frame structure with the connected reinforcing rod can meet the request of the new developed vehicle.