Abstract:

Taking a 350km/h electrical multiple units(EMU) head-car body as the research object, a finite element model was established in ANSYS. According to the standard EN12663, the stiffness and static strength of the model was analyzed. The results show that the maximum vertical deformation of head-car body is 539mm; the maximum equivalent stress is 2802MPa. The maximum equivalent stress locates in air spring constraints, which is less than the yield limit of material, and satisfies the requirements of the head-car body stiffness and static strength. Based on the actual circumstance of EMU in operation, four aerodynamic load cases were set up: two trains passing by each other in open wire, two trains passing by each other in tunnel, a single train passing through tunnel and cross wind. Successively for head-car body static strength analysis, the results are less than the yield limit of car body materials. The Goodman fatigue curve was used to evaluate the body fatigue strength. Each place safety coefficients is greater than one that meets the  requirements of fatigue strength.

Key words: electrical multiple units(EMU);head-car body, car body;aerodynamicload;finite element analysis;fatigue strength

摘要：

以某350km/h动车组头车车体为研究对象,在ANSYS中建立车体有限元模型,依据EN12663标准对其进行刚度和静强度分析,得到车体垂向最大变形为539mm,最大当量应力为2802MPa,最大当量应力出现在空气弹簧约束处,小于材料的屈服极限，满足车体刚度和静强度要求;根据动车组实际线路运行情况,增加明线会车、隧道会车、隧道通过和侧风工况4种气动载荷工况进行静强度分析,4种工况车体的静强度均小于车体材料的屈服极限;采用Goodman疲劳曲线图对车体疲劳强度进行评估,各部位安全系数均大于1,满足疲劳强度的要求。

关键词: 动车组；车体, 气动载荷, 有限元分析, 疲劳强度