薄壁管抗撞性能的多目标结构优化  

MULTIOBJECTIVE OPTIMIZATION FOR CRASHWORTHINESS OF TAPERED THIN-WALLED TUBES

作　　者：陈仙燕[1] 龙述尧[1] 杨旭静[2] 

机构地区：[1]湖南大学力学与航空航天学院,长沙410082 [2]湖南大学汽车车身先进设计制造国家重点实验室,长沙410082

出　　处：《数值计算与计算机应用》2008年第3期161-170,共10页Journal on Numerical Methods and Computer Applications

基　　金：国家自然科学基金(No.10672055)

摘　　要：以交通工具中部分锥形薄壁方管的安全装置作为研究对象,建立以薄壁管在碰撞过程中吸收能量最大化,比吸能最大化和初始碰撞力峰值最小化为多目标的优化问题,用锥形部分的几何参数作为设计变量,在保证不降低薄壁管吸能能力的情况下,通过对其结构的优化达到初始碰撞力峰值最小化的目的,论文采用有限元软件LS-DYNA得到不同几何参数模型的碰撞信息,用响应面法构造近似函数,同时引入权系数以表征各个目标在优化问题中的重要程度,并采用理想点法求解多目标优化问题,分析了锥形薄壁方管各几何参数对结构的能量吸收、比吸能和初始碰撞力峰值的影响,最终得到了给定权系数下的最优模型。As an important energy-absorbing device in automotive industry, the tapered thin-walled square tube is optimized. The maximization of the energy absorbed by the structure, the maximization of the Specific Energy Absorption （SEA）, and the minimization of the initial force peak are considered as the multiobjective functions. The geometry of the tapered tube is chosen as design variables. The optimization is based on the minimization of the initial force peak and the maximization of SEA. The objective functions are constructed based on the response surface method （RSM）. The multiobjective optimization for the tapered thinwalled square tube is presented by using the ideal point method and introducing weighted coefficients characterizing the priority of each objective function in the design.

关 键 词：部分锥形薄壁方管 响应面法 比吸能 初始碰撞力峰值 多目标优化 

分 类 号：TB114.1[理学—运筹学与控制论]