中文摘要：

为提高车门的抗柱撞性能，将基于SIMP理论的拓扑优化方法引入车门防撞梁设计，得到最佳的防撞梁材料分布；选择合适的截面构造防撞梁，得到一种Y形防撞梁结构；结合响应面法和NSGA—Ⅱ多目标优化算法对防撞梁进行多目标优化。相比于初始设计，优化后防撞梁在保证车门刚度满足法规要求的前提下，刚性柱的撞击侵入量减少22．59／6，车门抗柱撞性能明显提高。

英文摘要：

In order to improve the crashworthiness of pole to vehicle side impaet,topology optimization method was introduced to design the side door beam based on SIMP theory, and the optimized material distribution was obtained. Then,appropriate section was ehosen to construct the door beam and a Y-shape beam structure was formed. Multi-objective optimization was conducted by using response surface method combined with NSGA- Ⅱ algorithm. Compared to initial design, the crashworthiness of optimized door beam was improved greatly with the pole impact intrusion reduced by 22.5 %, while the door sti{fness still meets the regulation requirements.