基于拓扑优化的动集车小排障器安装座疲劳设计

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中图分类号：U270.3；TB115.1 文献标志码：B

Fatigue design of mounting seat in cowcatcher of power concentrated EMU based on topology optimization

YU Dezhuang ，LIU Zhanyu1， ZHANG Wei3， ZHANG Zhao2

（1.Department of Locomotive Development，CRRC Dalian Co.，Ltd.，Dalian 116022，Liaoning，China； 2.Traffic and Transportation Engineering，Central South University，Changsha 41OO75，China； 3.Department of Engineering MechanicsDalian University of Technology，Dalian 116O24，Liaoning，China）

Abstract： Based on variable density method，the mounting seat in cowcatcher of power concentrated electric multipleunits（EMU）is topologically optimized.The optimal topology of the mounting seat in cowcatcher is determined.The model of the optimized mounting seat in cowcatcher is re-built as finite element model. The load cases are established according to TJ/JW 102—2017 standard. The maximum stresses of the mounting seat in cowcatcher before and after optimization are compared by computations. The results show that the maximum stress after optimization is 40.32% lower than before optimization， and the stress distribution becomes more uniform after optimization. The load cases of fatigue are established according to TB/T3548—2019 standard.FAT90 curve is then used for the fatigue evaluation of the weld in the mounting seat of cowcatcher. The fatigue comparison shows that the fatigue life is obviously increased after optimization design. The optimized structure is finally applied and used in FXD3-J power concentrated EMU.

Key words： power concentrated EMU； topological optimization； variable density method；cowcatcher； fatigue；stress

0 引言

动力集中式动车组排障器位于司机室下方，是车体结构的重要组成部分，在动车行驶过程中起到排除轨道障碍物的作用，同时兼顾吸能和气动性能[2-5]，确保车体结构运行的经济性和安全性。（剩余7208字）