仿蜻蜓翅脉的车门内板加强筋多目标优化设计

Multi-objective optimization design on stiffeners for automotive door inner panel based on dragonfly wing vein structure

提出了一种车门内板加强筋布局优化仿生设计思路。结合单一车门内板在下沉工况、侧向柱碰撞、抗凹工况、一阶模态这4种工况下的拓扑优化结果,基于折衷规划法对车门内板进行多目标拓扑优化;结合多目标拓扑优化结果与蜻蜓翅脉优良结构,对车门内板的加强筋进行仿生设计;结合灰色关联度分析法与层次分析法,确定了多目标优化函数中各工况的权重比。研究结果表明:车门质量减轻了2.7%,并且在同样的载荷下,车门抗凹位移减少了37.6%,最大应力值减少了1.4%;下沉位移减少了27.1%,最大应力值减少了36.8%,侧向柱碰撞侵入量减少了1.5%,一阶固有频率增加了3.7%。设计结果为车门内板加强筋布局设计提供了新思路,一定程度上具有切实的工程应用价值。

A bionic design idea of optimizing the layout for the stiffener of automotive door inner panel was proposed, and combining the topology optimization results of a single automotive door inner panel under four conditions, such as sink condition, lateral column collision, anti-dent condition and first-order modal, the multi-objective topology optimization for the automotive door inner panel was carried out based on compromise planning method. Then, combining the multi-objective topology optimization results and the excellent structure of dragonfly wing vein, the bionic design on the stiffener of the automotive door inner panel was carried out, and the weight ratio of each condition in the multi-objective optimization function was determined by gray correlation analysis method and hierarchical analysis method. The research results show that the automotive door mass is reduced by 2.7%. Furthermore, Under the same load, the anti-dent displacement of the automotive door is reduced by 37.6%, the maximum stress value is reduced by 1.4%, the sink displacement is reduced by 27.1%, the maximum stress value is reduced by 36.8%, the intrusion of lateral column collision is reduced by 1.5%, and the first-order inherent frequency is increased by 3.7%. The design results provide new ideas for the design on the stiffener layout of the automotive door inner panel and have practical engineering application value to some extent.