基于响应面法的S型薄壁梁抗撞性优化设计  

Optimal Design of S-shaped Rail for Crashworthiness Analysis Based on Response Surface Method

作　　者：武和全[1] 杨家兴[2] 辛勇[3] 

机构地区：[1]长沙理工大学汽车与机械工程学院,长沙410114 [2]江西蓝天学院机械系,南昌330098 [3]南昌大学机电工程学院,南昌330031

出　　处：《机械科学与技术》2010年第9期1132-1136,共5页Mechanical Science and Technology for Aerospace Engineering

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)资助

摘　　要：将响应面法与试验设计、有限元分析计算等结合起来,首次对S型薄壁梁的结构进行抗撞性优化设计。选取S梁的截面宽度、截面高度和S梁的弯曲角3个参数作为研究对象,采用显示非线性有限元软件PAM-CRASH对S型薄壁梁结构进行碰撞模拟。运用响应面法对S梁的总吸能值等进行拟合,并使用MATLAB软件进行优化求解。结果表明:当S梁截面高宽比最大且弯曲角最小时其吸能能力最大。将优化后的S梁应用于某越野车的40%偏执碰模拟中,其被动安全性得到明显提高。S-shaped rails in vehicle structure are the main energy-absorbing components during vehicle impacts.In this paper,the response surface method was employed to obtain optimum crashworthiness design of the S-rails structure.The method adopted in this research made use of numerical optimization algorithms and Design of Experiments（DOE） based approximation methods.The nonlinear explicit finite element code PAM-CRASH was used to simulate the rail impact problems and generate the energy functions to be maximized.Several design parameters such as the cross section width,cross section height and the curvature angle about S-rails have been proposed and used to optimize the S-rails structure.The results show that S-rails with large aspect ratio and small curvature angle will absorb much energy during the impacts.The optimal S-Rail is used in an off-road vehicle＇s 40% offset-barrier impact model and the passive safety of the vehicle is much improved.

关 键 词：S型梁 优化 响应面 抗撞性 有限元 

分 类 号：U461[机械工程—车辆工程]