摘要
为了实现车辆在碰撞事故中的被动安全保护,综合运用比吸能较高的方管、圆管及蜂窝铝等不同吸能元件,设计一种城轨车辆用可更换的两级吸能组合吸能结构,并运用显式有限元分析软件ANSYS/LS-DYNA进行25 km/h撞击速度下碰撞仿真分析。研究结果表明:吸能结构发生了有序可控的两级塑形变形,第一级为铝蜂窝压缩变形,其变形行程为151.1mm,撞击平台力约为154.8 kN,吸能量为24 kJ;第二级为方管叠缩和圆管挤压变形,变形行程约为307.6 mm,平台撞击力为732.5 kN,吸能量为190.2 kJ。为城轨车辆用吸能结构设计提供新思路。
To realize passive safety protection of the vehicle in collision accidents, a kind of replaceable two - level energy absorbing structure for urban rail vehicle was designed, which made a combination of high specific energy absorbing components such as square tube, circular tube and aluminum honeycomb. Then the explicit finite element software LS - DYNA was adopted to conduct the impact simulation analysis under conditions that the impact velocity is 25 km/h. The results show that the energy absorption structure has two - stage plastic deforma- tion. The first level is aluminium honeycomb compression deformation, in which the deformation stroke is 151.1 mm, the impact platform force is about 154.8 kN, and energy absorption is 24 kJ. The second level include the square tube fold contraction and circular tube extrusion deformation where deformation journey takes about 307. 6 mm, platform bump is 732.5 kN and energy absorption is 190.2 kJ. A new design method of energy absorption structure is put forward for urban rail vehicle.
出处
《铁道科学与工程学报》
CAS
CSCD
北大核心
2013年第3期94-98,共5页
Journal of Railway Science and Engineering
基金
国家自然科学基金资助项目(51275532)
关键词
吸能结构
有限元分析
碰撞仿真
energy absorption structure
finite element analysis
impact simulation
