中文摘要：

汽车轻量化设计是汽车节能减排的重要手段,同时又必须满足各种工况及NVH等性能要求。对于多学科间的多性能综合优化,软件多采用线性加权方法,但对非凸优化问题来说,不能确保得到所有Pareto最优解,因此采用基于折衷规划法和平均频率公式构造的优化方程对引擎盖内板进行多性能约束的拓扑优化,获得更准确材料密度分布,从而更有效的对引擎盖进行结构改进和优化。并通过与原车型引擎盖的刚度及模态和质量等数据进行对比分析,验证了优化方案的可行性及轻量化效果。

英文摘要：

The lightweight design is an important means of energy saving about vehicle,at the same time it needs to meet the performance requirement of different conditions and NVH.About multi-subject and multi-function comprehensive optimization,the software uses linear weighted method to analyze,which can＇t get all the best Pareto optimal solution.Based on SIMP（solid isotropic material with penalization） method and mean frequency formulation,a new equation to finish multi-function topology optimization about hood is defined,in order to get more accurate result and more effective structure improvement and optimization of the hood.Contrast the new hood with original hood about the data of stiffness,modal and quality,the method is verified feasible and the effect of lightweight is achieved.