基于材料匹配的汽车保险杠多目标优化

汽车前保险杠在RCAR正面40%低速碰撞中及与行人下肢碰撞中起着吸能与缓冲的作用,汽车保险杠的刚度对于满足RCAR等级评价及行人下肢保护两种性能都有很大的影响.综合考虑行人下肢保护法规与RCAR的要求,以材料为变量进行正交试验设计,分别采用响应面法和综合平衡法对汽车保险杠进行多目标优化.研究结果表明,响应面法能够很好地表征材料屈服强度与各个目标值之间的关系,综合平衡法能更好地解决离散的、变量少、水平数少的多目标优化问题.经优化后,汽车保险杠的整体性能得到了提高.

Multi-objective optimization of automobile bumper based on match of materials

The front bumper of the car plays the roles of energy absorption and buffering in the front impact of 40% of RCAR (Research Council for Automobile Repairs)and the impact between the lower leg of pedestrian with the bumper of the car, and its stiffness has a significant impact on both bumper performances of satisfying RCAR requirement for level estimate and the lower leg protection of pedestrian. Multi-objective optimization for the bumper considering the RCAR requirements and pedestrian protection rules was carried out. Orthogonal method was used to design the experiment with the variables of material. Both response surface methodology (RSM) and integral balance method were used to optimize the bumper of the car. The study results show that the RSM can well manifest the relationship between the yield strength of the materials and the targets, while the integral balance method can well solve the problems of discrete variable, less variables and low levels. The overall performances of the bumper of the car are improved after optimization.