摘要
在金属薄壁圆管(原模型)的基础上,分别引入不同形式的圆弧形诱导槽结构并以其为研究对象,建立以诱导槽半径、槽端距、槽间距为优化参数,以比吸能和最大峰值碰撞力为评价指标的多目标优化模型。分析研究了诱导凹槽、凸槽及凸凹交替的诱导槽结构对薄壁构件吸能、最大峰值碰撞力的影响。采用有限元软件LS-DYNA得到不同几何参数模型的碰撞响应,结合径向基函数法构造近似函数,并采用理想点法进行优化设计,得出使结构最优时的不同形式的诱导槽半径、槽端距及槽间距,从而得到了不同形式的理想诱导槽优化结构。
Metal thin-walled cylinders with different inducing grooves were taken as a study object. The maximization of the specific energy absorption （SEA）and the minimization of the maximum peak impact force （Fmax）of the cylinders were chosen as the evaluation indexes and radius of inducing grooves,distance between inducing grooves and free end,and distance between inducing grooves were chosen as design variables to establish a multi-objective optimization model.The finite element code LS-DYNA was adopted to compute the impact responses of the cylinders with different inducing grooves. Furthermore, an approximate objective function was constructed with the radial basis functions （RBFs）,the optimal design was performed by using the ideal point method and considering the effects of inducing convex grooves,inducing concave ones and concavo-convex ones on SEA and Fmax.After the optimization,the optimal values of inducing groove radius,diatance between inducing groove and free end,and distance between inducing grooves were obtained.Thus,the ideal and optimal structures for inducing grooves were achieved.
出处
《振动与冲击》
EI
CSCD
北大核心
2014年第8期16-21,共6页
Journal of Vibration and Shock
基金
国家自然科学基金项目(50975121)
吉林省科技发展计划项目(201101030)
一汽集团科技创新项目"乘用车碰撞概念模型建立与优化分析"(1332)
关键词
薄壁构件
比吸能
最大峰值碰撞力
抗撞性
诱导槽
thin-walled cylinders
specific energy absorption （SEA）
maximum peak impact force （Fmax ）
crashworthiness
inducing grooves
