基于可移动变形组件法的纯电动汽车门槛梁截面优化设计  

Structural Optimization Design of Threshold Beam Section of Electric Vehicle Based on Moving Morphable Component Method

作　　者：蒋青青 吴锦妍[1] 史国宏[1] JIANG Qingqing;WU Jinyan;SHI Guohong

机构地区：[1]泛亚汽车技术中心有限公司,上海201208

出　　处：《上海汽车》2024年第12期19-26,共8页Shanghai Auto

摘　　要：为了有效地保护电动汽车在侧面刚性柱碰撞过程中的电池安全,文章采用新型拓扑优化方法——可移动变形组件法(MMC),设计出合理的门槛梁挤压铝结构,使其充分吸收柱碰能量。通过提取侧面刚性柱碰撞过程中各时刻门槛梁结构受力及变形情况,结合门槛梁周边结构特点,确定拓扑优化初始设计域与边界条件;通过对简化后的门槛梁优化设计域进行多工况拓扑优化,设计出一种新型的挤压铝一体式成型门槛梁结构,并对该结构进行轻量化设计优化;优化前后侧面刚性柱碰分析结果表明,该优化门槛梁设计满足动力电池包的保护要求,其中电池外板侵入量降低了16%,减重率达7.4%。To effectively protect the battery safety of electric vehicle in side pole impact,a new topology optimization method,moving morphable component method(MMC),is adopted in or⁃der to design a reasonable threshold beam structure,which fully absorb the side pole impact energy.The initial design domain and boundary conditions of the topology optimization are determined by ex⁃tracting the stress and deformation of the threshold beam structure at each time in side pole impact,and combining with the characteristics of the surrounding structure of the threshold beam.A new type of extruded aluminum all-in-one molding threshold beam structure is designed through multi-load cases topology optimization of the simplified threshold beam optimization design domain,and the lightweight design optimization of the structure is carried out.The analysis results of the side pole im⁃pact before and after optimization show that the optimized threshold beam design meets the protection requirements of the power battery pack,in which the intrusion of the battery outer plate is reduced by 16%and the weight reduction rate is 7.4%.

关 键 词：门槛梁 拓扑优化 可移动变形组件法 挤压铝一体成型 

分 类 号：U469.72[机械工程—车辆工程] U463.834[交通运输工程—载运工具运用工程]