中文摘要：

为全面准确地获得动车组转向架在工作过程中的疲劳特性,针对转向架焊接构架几何结构相对复杂的特点,采用子模型技术对构架的疲劳寿命进行了分析。对焊接构架的整体模型进行了初步的受力状况分析,为保证计算精度,建模时,尽可能地保持构架原有的几何特征,并使边界条件符合实际工况;为解决仿真计算过程中有限元模型过于庞大、计算耗时长等问题,引用了子模型技术。在验证所设计的子模型可靠的基础上,利用子模型技术,对焊接构架的关键焊缝进行精确的疲劳寿命预测,计算结果表明,该型转向架构架焊缝的疲劳寿命满足设计要求。

英文摘要：

To comprehensively and accurately understand the fatigue characteristics of the Bogie of a high-speed trains during its service process, sub-model technology of ANSYS is applied to carry out two-stage analysis of the fatigue strength of the Bogie based on complicated geometrical structure of the Bogie. Firstly, the force status of the Bogie is preliminarily analyzed by using global model, during this process, the geometrical structure and force status of the Bogie should consist with the actual operation mode as possible as it could; After that a fatigue analysis for weld of the frame is made, sub-model technology is produced to solve immense model and long time-consuming. The anti-fatigue life of principal weld of welded frame is recalculated by using sub-model technology on the basis of reliable sub-model designed. The predicted result shows that the fatigue life of bogie fame is enough.