考虑车辆高速和低速耐撞性的多目标优化设计

<正>面高速耐撞性设计,需确保车内乘员的人身安全,使车内乘员的人身伤害降到最低;正面低速耐撞性设计,要求尽量减少车辆在碰撞中的损伤,使车辆具有良好的碰撞损伤修复经济性。本文根据上述特点,将车辆的正面高速耐撞性与正面低速耐撞性相结合,并且考虑车身部件的轻量化,提出了一种优化设计方法。该方法将保险杠、吸能盒内外板以及前纵梁内外板五个部件厚度作为优化设计变量,在正面低速碰撞中,以前纵梁吸收的碰撞总能量作为其是否发生较大变形的依据,利用代理模型和遗传算法进行了优化计算。最后,将该方法应用在某一车型的耐撞性设计中。

Multi-objective optimization and design considering automotive high-speed and low-speed crashworthiness

The main purpose of the design in frontal high-speed crashworthiness is to ensure the safety of occupants and minimize the passengers body damage.Meanwhile, in the frontal low-speed crashworthiness design, it requests to reduce automotive collision damage and possess good economic performance in the collision damage repair.According to the characteristics above, the vehicle frontal crashworthiness of high-speed and low-speed positive crashworthiness combined, and considering the lightweight of automobile body parts, an optimization design method is proposed.That is, thicknesses of frontal bumper, crash-box inner and outer plates, frontal longitudinal beam internal and external plates are selected as five design variables, and the energy of frontal longitudinal beam absorbed in the low-speed collision is taken as the basis of whether the large deformation, the agent model and genetic algorithm are used to calculate.Finally the method had been applied to a vehicle crashworthiness design.