基于一维混合元胞自动机模型的汽车变厚度B柱设计

Design of automobile tailor rolled blank B-pillar based on one dimension hybrid cellular automata model

为了将连续变厚度轧制工艺更好地应用于车身轻量化设计和耐撞性设计,针对连续变厚度轧制(TRB)B柱不同区域厚度分布的设计问题,提出一维混合元胞自动机(ODHCA)模型。建立变厚度B柱的ODHCA模型,提取元胞厚度作为设计变量,确定其局部更新规则;根据连续变厚度轧制工艺的特点定义设计区域的约束条件,确定ODHCA方法的迭代方式与收敛准则。结果表明:应用ODHCA方法,在等质量情况下,胸部、腹部、骨盆位置侵入量分别降低了8.8%、13.4%、14.6%;而在质量降低14.2%时,上述各部位的位置侵入量分别降低了5.8%、9.6%、10.3%。因而,该方法可以改善B柱的变形模式,提高侧面碰撞安全性能,并满足轻量化要求。

A one dimension hybrid cellular automata（ODHCA） model, which can handle the optimization problem of thickness distribution in different area of the tailor rolled blanks（TRB） B-pillar, was proposed to effectively apply the tailor rolled blank into the lightweight design and the crashworthiness design of the vehicle body. The ODHCA model was established and the TRB B-pillar was divided into several one dimensional cells along the rolling direction; the thicknesses of the cells were extracted as the design variables and the local update rules were determined. The thickness distribution constraint function of the design region was defined. The iterative method and convergence criterion of ODHCA was determined according to the characteristics of flexible rolling process. The results show that the intrusion of the thorax, abdomen, and pelvis is reduced by 8.8%, 13.4%, and 14.6% respectively in the case of equal mass; while the mass is reduced by 14.2%, those of the above body parts is reduced by 5.8%, 9.6%, and 10.3% respectively. Therefore the method can improve the deformation mode of the B-pillar and the side crashworthiness performance, leading to meet the lightweight requirements.