基于薄壁梁耐撞性理论的乘用车前纵梁轻量化设计  

Lightweight method of car's front rails based on the theory of thin-walled beam crashworthiness

作　　者：张君媛[1] 陈光[1] 武栎楠[1] 刘嬴[1] 

机构地区：[1]吉林大学汽车仿真与控制国家重点实验室,长春130022

出　　处：《吉林大学学报（工学版）》2013年第6期1441-1446,共6页Journal of Jilin University:Engineering and Technology Edition

基　　金：国家科技支撑计划项目(2011BAG03B04)

摘　　要：以某国产中级轿车车身前纵梁的轻量化为研究目标,在矩形薄壁梁压溃理论的基础上,推导了多直角截面薄壁梁平均压溃力表达式。根据整车65km/h正面全宽碰撞(FRB)波形目标分解得到的前纵梁子结构吸能和反力以及轻量化目标,采用多直角薄壁梁压溃理论和矩形薄壁梁弯曲理论指导了新纵梁的截面设计,结合有限元分析方法对厚度进行修正,完成了前纵梁结构的正向设计。新设计的前纵梁在使整车正面抗撞性指标不变的同时,自身质量减轻了20%。This paper studies the lightweight method of the front rail of domestic mid-size cars. The average crushing force of the thin-walled beam composed of multiple right angles is derived based on the theory of the crushing of rectangular thin-walled beam. Meanwhile, the substructure dissipated energy and force are obtained by target cascading of the acceleration pulse in 65 km/h frontal crash. Based on the force and the lightweight target of substructures, the new cross-section of the rails is designed with the theory of crushing of multiple right angles thin-walled beam and bending of rectangular thin-walled beam. Then the wall thickness of the new rails is modified by finite element analysis. The weight of the new front rails designed by lightweight method is reduced by 20 % and the frontal crashworthiness is remained reserved.

关 键 词：车辆工程 轻量化 薄壁梁抗撞性 前纵梁 

分 类 号：U461.91[机械工程—车辆工程]