摘要
矩形薄壁空心直梁是汽车纵梁经常采用的结构形式,并且是承受正面碰撞的主要部件,其结构的耐撞性及碰撞吸能优化是现代汽车研究的重要内容。以矩形薄壁梁为研究对象,基于动态有限元分析模型,利用LS-DYNA软件中的OPT模块技术,研究矩形薄壁梁横截面的边长比变化对其耐撞性能的影响,对薄壁直梁在轴向冲击载荷下的耐撞性能进行了优化仿真。优化结果表明,当矩形两个边长的比值为0.6时,结构的碰撞力峰值最小,吸收的塑性变形能最大,具有最好的耐撞性能。
Thin-walled rectangular straight beam is general structure of vehicle’s frontal rail which is the main part undergoing frontal impact.It is an important issue for study of modern vehicle to optimize the crashworthiness and energy-absorbing characteristic of this structure.Thin-walled rectangular beam was studied and finite dynamic model was set up based on OPT module of LS-DYNA code.The effect of length ratio between the two different sides of rectangular cross section was studied.Simulation was carried on axial crashworthiness optimization of thin-walled rectangular beam.Simulated results show that the structural crashworthiness is best as the length ratio of the two different sides is near 0.6.The optimal structure can minimize the peak value of impact force and absorb the most plastic-deforming energy.
出处
《机械设计与制造》
北大核心
2009年第12期36-38,共3页
Machinery Design & Manufacture
基金
山东交通学院科研基金资助项目(Z200719)
关键词
汽车
耐撞性
优化
有限元
Vehicle
Crashworthiness
Optimization
FEM
