基于拓撲優(yōu)化的動集車小排障器安裝座疲勞設(shè)計

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中圖分類號：U270.3；TB115.1 文獻標志碼：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

動力集中式動車組排障器位于司機室下方，是車體結(jié)構(gòu)的重要組成部分，在動車行駛過程中起到排除軌道障礙物的作用，同時兼顧吸能和氣動性能[2-5]，確保車體結(jié)構(gòu)運行的經(jīng)濟性和安全性。（剩余7208字）