摘要
薄壁吸能结构是碰撞等突发事件中吸收冲击动能的主要构件,其性能直接关系到人身的被动安全。文中在传统光滑表面的薄壁结构上添加规则波纹,建立相应的理论模型,运用有限元数值模拟软件(ANSYS/LS-DYNA)对新结构的最大吸能进行分析,应用响应面法拟合出结构吸能最大值的函数,采用遗传算法对拟合出来的优化模型进行求解,从而得到波纹高度和波纹顶点到轴线距离的最优值,使得结构的吸能最大值提升了76%。其中,结构抗撞性分析的计算量大,将其进行并行化,从而减少了计算时间,提高了效率,为结构抗撞性分析提供了一个高效可靠的方法。
Thin-walled energy absorbing structure is the main component absorbing the impact kinetic energy in unexpected events,its performance is directly related to the passive safety of people.In this paper,the regular patterns were added to the thin-walled structure with traditional smooth surface,the appropriate theoretical model was built,and the maximum energy absorption of the new structure was analyzed by using the finite element numerical simulation software（ANSYS/LS-DYNA）,Response Surface Methodology was applied to fit the function of maximum energy absorption of structure,then the Genetic Algorithm was used to solve the optimization model.Finally,the optimal value of height and the distance between pattern′s peak and axis line were obtained.The result indicated that the maximum energy absorption of the structure was raised by76%.Because computation required by the structural crashworthiness analysis is very heavy,the parallel computation was used to reduce the computation time and improve the efficiency, which provided an high efficient and reliable method for structural crashworthiness analysis.
出处
《机械设计》
CSCD
北大核心
2011年第8期62-66,共5页
Journal of Machine Design
基金
国家自然科学基金资助项目(10872012)
教育部博士学科点专向科研基金资助项目(63001015200701)
关键词
薄壁结构
抗撞分析
并行
优化
Key words：thin-walled structure
crashworthiness analysis
parallelization
optimization
