摘要
针对两种耦合正面碰撞工况在耐撞性优化时相互影响的问题,将两种工况的设计变量和优化模型进行统一,建立多目标优化模型并进行优化。首先以两种正面碰撞所涉及的主要部件厚度为变量,选取了每个工况下能够体现整车耐撞性能的参数为目标;然后以两个碰撞工况下的加速度峰值和整车吸收的最大能量为目标函数,以车辆前部7个部件总质量和A柱的侵入量为约束函数,建立两种正面碰撞工况耐撞性优化的数学模型并进行精度验证;最后,在结构轻量化约束条件下,结合多岛遗传算法和非支配排序遗传算法对车辆前部部件进行耐撞性优化设计。对比优化前后结果表明:各个耐撞性优化目标均有一定程度的改善,有效地提高了车辆在两种工况下的耐撞性,为耦合碰撞工况要求下的结构设计提供了一种设计参考。
Due to the interaction of two coupled cases of frontal impact, a multi-objective optimization is conducted by integrating the two frontal impact model and design variables. Firstly, the thickness of the components which were crucial to frontal impact is selected as design variables and performance indexes which can represent vehicle crashworthiness under each impact case are chosen as optimization targets. Then, taking the peak acceleration and absorbed energy as targets and the mass of seven frontal components and the intrusion of A-pillar as constraints, the mathematical model concerning the crashworthiness optimization of the two frontal impact case is constructed and the accuracy of the model is verified. Finally, the vehicle forepart crashworthiness opti- mization is conducted under the constraint of lightweight design by employing multi-island genetic algorithm and non-dominated sorting genetic algorithm. The result comparison of the before and after optimization shows that the crashworthiness of the two ca- ses are improved simultaneously. The method proposed provides a reference of structure design under coupled impact cases.
出处
《现代制造工程》
CSCD
北大核心
2015年第9期138-144,共7页
Modern Manufacturing Engineering
基金
国家自然科学基金资助项目(11232004)
国家重点基础研究发展规划项目(2010CB832705)
