基于头碰与结构性能的发动机罩正向优化设计

Hood Design and Optimization Based on Head Impact and Structural Performances

文章以某发动机罩正向开发为例,通过将头碰工况转化为静态加载的方法,结合刚度模态工况,对发动机罩进行多学科拓扑优化及概念设计。建立全参数化模型,快速设计并验证了发动机罩初始方案。自行开发的二次开发工具包实现了大样本点生成、提交计算及提取结果的自动化。运用基于试验设计与近似模型的参数优化技术,研究了影响发动机罩各项性能的关键因素,同时平衡发动机罩各项性能与重量的关系,得到优化设计方案。通过对Pareto前沿的研究,定量寻找性能之间的走势关系,并寻找性能效率的拐点,从而提高了发动机罩的正向开发能力。

In the hood design application, the impact load is transferred to the static load using equivalent static load method (ESL). The critical load path of hood inner to balance head impact and mode requirements is found by topology optimization. The implicit parametric SFE model is used to optimize the detailed design. Process automated tools are developed to generate DOE samples, submit to the PBS system and extract the results. Based on the DOE statistics, the key design factors of each performances and the optimization solution can be found. To investigate the relationship between performances, and find the high efficiency point, the multi-objective Pareto frontier is developed. The design process and the analysis conclusions can be used as the database of future design to improve the hood design capability.