摘要
利用CAE有限元仿真分析法,在某乘用车的几何模型基础之上,利用LS-DYNA软件建立偏置碰撞试验仿真模型,对模型进行仿真求解,并对仿真结果进行分析,根据仿真结果分析得出前纵梁结构存在的问题,进而对前纵梁结构进行改进,使其达到C-NCAP标准。通过对试验结果中前围板侵入量和车身加速度的比较,进行改进后的有效性分析;针对前纵梁结构改进的方案,运用3K全因子试验设计法,分别对前纵梁选取3种不同的材料及料厚对其进行二次全因子优化,重新进行碰撞仿真运算,通过比较9组试验的车身加速度峰值,选出车身加速度峰值最小的一组为最优方案。结果显示:材料选取B550L,厚度为1.5 mm的前纵梁,吸收碰撞能量的效果是九组试验组合中最好的,可以有效地提升汽车的被动安全性能。
Based on the geometric model of a passenger car, the simulation model of offset collision experiment is established by using LS - DYNA software. The model is simulated and solved, and the simulation results are analyzed. According to the simulation results, the existing problems of the front longitudinal beam structure are analyzed, and then the structure is improved to reach the C -NCAP standard. Through the comparison of the front inclinometer intrusion and the acceleration of the vehicle body, the improved effectiveness analysis is carried out. Then, based on the improvement scheme of the front longitudinal beam, the 3K full factor test design method is used to select three different materials and thickness for the beam respectively, and the two full factor optimization is carried out. Then, the collision simulation operation is carried out again. By comparing the body acceleration peak value of the nine groups of tests, the group with the smallest acceleration peak value is selected as the optimal scheme. The results show that the mate-rial selection of B550L, the thickness of the 1. 5mm front longitudinal beam, the effect of absorbing collision energy is the best combi-nation of nine groups of tests, which can effectively improve the passive safety performance of the vehicle.
出处
《森林工程》
2017年第6期83-87,共5页
Forest Engineering
基金
黑龙江省留学归国人员科学基金(LC2015019)
关键词
有限元
偏置碰撞
结构优化
Finite element
offset collision
structural optimization
