电动车车身正向概念轻量化设计

Lightweight Forward Conceptual Design of Electric Vehicle Body

对某铝合金电动车车身进行了正向概念轻量化设计,建立了静动态工况下的车身拓扑模型,进行了基于动静态性能驱动的整车拓扑优化,确定了车身框架结构,并对拓扑优化结果并进行了工程修正,建立了几何结构初始模型。根据车身结构和截面特点,建立了车身简化力学模型,应用遗传算法进行了截面参数优化,基于优化后的参数建立了车身有限元模型,进行了接头区域灵敏度分析和优化,直至满足刚度要求。最后完成了样车试制和车身刚度试验验证,结果表明,设计出的铝合金车身结构满足了车身刚度要求,并达到了较好的轻量化效果。

The lightweight forward conceptual design of an aluminum electric car body was completed. The body topology model was built based on static and dynamic conditions ,and pelformance-driven topology optimization was performed. Then the body frame structure and the initial geometry model were determined by engineering amended. On the basis of the body structure and the cross-sectional characteristics, the body simplified mechanics model was constructed and the parameters of body sections were optimized based on genetic algorithm The body finite element model was constructed whose parameters were optimized. Regional sensitivity analysis and optimization of joints were conducted with high sensitivity joints strengthened, until body stiffness meeting requirements. Finally the sample vehicle body was trial-manufactured and body stiffness experiment was accomplished, which indicated that the body structure can meet the body stiffness requirements and reach a better lightweight effect.