基于某微车顶压工况下B柱轻量化优化设计

Lightweight Optimization Design of B-pillar Based on the Condition of Micro-car Roof Pressure

建立某微车整车有限元模型,进行顶部抗压强度仿真模拟分析.通过顶压关键结构灵敏度分析,得出B柱贡献值最大;选取B柱内板、外板、加强板的厚度与材料作为设计变量,利用最优拉丁超立方采样进行样本空间设计.根据多目标优化NSGA-Ⅱ算法进行目标优化设计,并对最优方案进行验证.仿真结果表明,B柱质量减少3.1kg(降低20.4%),刚性墙最大载荷为46.6kN(提高10.4%),3倍装备质量力下位移45.5mm(下降32.1%),有效提高车辆顶部抗压强度,同时实现B柱轻量化设计.

The finite element model of a micro-car was established to calculate the roof compressive strength.The contribution value of the B-pillar was the largest through the sensitivity analysis of the key structure under roof pressure.Choosing the thicknesses and materials of the inner,outer and reinforcing plates of B-pillar as the design variables,the sample space was designed by the optimal Latin hypercube sampling.According to the multi-objective optimization NSGA-II algorithm,the optimal design was carried out and the optimal scheme was verified.The simulation results show that the weight of the B-pillar is reduced by 3.1 kg(reduced by 20.4%),the maximum load of the rigid wall is 46.6 kN(increased by 10.4%),and the displacement under the force of three times of equipment quality is 45.5 mm(reduced by 32.1%),which improves the roof compressive strength effectively.And the lightweight design of B-pillar is also achieved.