基于正交试验法的汽车B柱结构优化设计

Optimization analysis of B-pillar structure based on orthogonal test method

针对通过优化B柱结构来改善整车轻量化的问题,对B柱结构和材料进行了优化设计。选取了上下板厚度和焊缝等因素,建立了L9正交试验表,将质量、最大侵入量、最大侵入速度作为目标,进行了B柱结构优化设计,得到了DP780 1.5 mm,DP590 1.2 mm,焊缝高度为455 mm的最优组合;进行了落锤试验台架分析,对比了优化前后B柱的抗撞性和轻量化效果。试验结果表明:优化设计后B柱的抗撞击性能略有提升,侵入量、侵入速度明显降低,承载则有所增加,同时实现了轻量化11%。

Aiming at the vehicle lightweight problem which improved by optimizing the B-column structure, B-pillar structure and materials were optimized. The thickness of the upper and lower plates and the welding line were selected as factors to establish the L9 orthogonal test table. The quality, maximum intrusion and maximum intrusion speed were taken as the targets, and the B-pillar structure optimization design was carried out to obtain the optimal combination that DP780 is 1.5 mm, DP590 is 1.2 mm, and the weld height is 455 mm. The bench analysis of the drop weight test was carried out to compare the crashworthiness and lightweight effect of the B-pillar before and after optimization. The results indicate that the impact resistance of the B-pillar is slightly improved after the optimized design. The intrusion volume, intrusion speed is significantly reduced and bearing capacity is increased. At the same time, lightweight design is reduced by 11%.