双层分级吸能结构优化设计

为提高汽车的安全性，确保在增加结构吸能量的同时又不增大碰撞峰值力，引入分级吸能的设计思想，提出一种新型的吸能结构，采用显示有限元软件对该分级吸能结构进行动态轴向压缩模拟。同时，以结构的壁厚及宽度为设计变量，采用响应面法，并结合正交试验设计进行优化，优化过程中建立了结构的比吸能和初始碰撞峰值力的多目标优化标函数，采用权重法求得该分级吸能结构的壁厚和宽度的最优解。  

Optimization of Bouble-layer Hierarchical Energy Absorbing Structure

In order to improve the safety of a car and increase the energy absorption of structure components as well as keep the impact peak force not being increased, a new type of energy absorption structure is proposed in this paper based on the design approach of hierarchical energy absorption. Using explicit finite element analysis, the axial dynamic compression of the new structure is simulated. By defining the thickness and width of the structure as the design variables, the proposed structure is optimized using the response surface method and orthogonal experimental design. The multi-objective optimization model for the energy absorption and maximum impact force of the new proposed structure are provided during the process of optimization, and the optimal solutions of the structure thickness and width are obtained by using the weighting method.