摘要
综合考虑车顶强度和侧面碰撞的安全性能,对某轿车的B柱结构进行优化设计。基于顶压和侧碰的简化模型对B柱内板分成上下两部分进行焊接,将其高强度钢选型和厚度作为离散设计变量,同时对材料成本、车顶最大承载作用力、B柱侵入速度和侵入量进行约束,建立B柱结构优化的数学模型。采用移动最小二乘法构造近似模型,结合遗传算法对B柱拼焊板结构进行优化设计。结果表明:在优化计算效率大大提高的同时,材料成本降低了8.0%,B柱结构总质量降低了19.3%,B柱侵入速度、侵入量分别减小了5.6%和3.5%,车顶承载能力提高了17.3%,有效提高了车顶强度和侧面碰撞的安全性能。
Considering the roof strength and side impact safety,the B-pillar structure of a car is optimized.Based on the simple model of roof strength and side impact,the inner plate of B-pillar consists of two different parts which are welded together by tailor-welded blank technology and formed by high strength steel.The type of material and the thickness of steel are treated as discrete design variables.The optimization model of the structural crashworthiness of B-pillar is established by considering the material cost,the impact force,the intrusion and its velocity at B-pillar.The moving least square construction approximation model and genetic algorithm are utilized to improve the crashworthiness of B-pillar.The results show that while improving the optimization calculation efficiency,the material cost is reduced by 8.0%,the total mass of the B-pillar structure is reduced by 19.3%,the intrusion speed of the B-pillar is reduced by 5.6%and 3.5%,and the load capacity of the roof is increased by 17.3%.The roof strength and the safety of side impact are effectively improved.
出处
《上海汽车》
2019年第10期28-36,共9页
Shanghai Auto
