摘要
在研究多种不同截面形状薄壁梁碰撞吸能特性的基础上,提出了一种有效的变截面梁结构。选取变截面梁的主要设计参数作为研究对象,将有限元分析与试验设计、响应面法等结合起来,对变截面梁的抗撞性能进行分析,建立了变截面梁的抗撞性多目标优化模型;采用优化算法进行求解,得到了变截面梁的最优设计参数和多目标优化后的Pareto最优解,并通过有限元分析对最优设计参数进行了验证;最后将优化后的变截面前纵梁结构应用于某越野车40%偏置碰模拟中。试验结果表明,碰撞侧A柱的加速度峰值显著降低,整车的被动安全性得到提高。
An effective structure of thin-walled rail with variable section was proposed by comparing a variety of thin-walled rails with different section features. Several design parameters of the structure were used to optimize the rail＇s structure. Optimal design method was presented and utilized to obtain optimal crashworthiness design of the thin-walled rail with variable section. The quadratic models for energy absorption and maximum impact force were created using response surface methodology exploiting finite element analysis results. The optimal parameter values and the Pareto optimal solution were found with the software of Matlab. Then the optimal results were verified through the finite element analysis of thin walled rail. The optimal thin walled rail with variable section was used in an off-road vehicle＇s 40% offset-barrier impact model and the passive safety of the vehicle was improved a lot. 3 tabs, 12 figs, 12 refs.
出处
《长安大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2010年第1期88-94,共7页
Journal of Chang’an University(Natural Science Edition)
基金
国家自然科学基金项目(50645032)
江西省科技攻关计划项目(C0202400)
关键词
汽车工程
优化设计
变截面梁
抗撞性
吸能
automobile engineering
optimal design
thin walled rail with variable section
crashworthiness
energy absorption
