Modeling and Stress Analysis of Brake Hub of EMU Train under Running State

doi:10.3901/JME.2019.05.097

Abstract

Abstract: Brake hub (BH) is an important connecting part of EMU braking system. At present, it is difficult to explain the mechanism of early fatigue failure of BH, because only the brake state of vehicle is considered and the normal running state is always neglected. In this paper, the dynamic analysis of BH under normal running state shows that the BH is mainly subjected to two inertia forces of motion state, namely, the rotation of brake disc and the impact of road spectrum, then the mechanical model of BH is established. With the help of the methods of elastic mechanics and dynamics, the deformation coordination conditions of brake disc and hub (BDH) are proposed by modeling simplification. As the result, the dynamic stress analysis method of BH teeth is put forward, and the conclusion that BH teeth are mainly in the state of random dynamic tension stress is revealed, so the failure mode of BH teeth belongs to fatigue failure. Finally, taking the BH of EMU as an example of calculation and analysis, the resultant stress of the BH teeth varied with different additional vertical acceleration and running speed is analyzed. The results show that the greater the additional acceleration under the impact of road spectrum and running speed are, the greater the resultant stress of the BH teeth is. Furthermore, according to the mechanical model of the brake disc-hub (BDH), their size and quality can also affect the stress of the BH teeth.

Key words: brake hub teeth, braking disc, running status, stress analysis

CLC Number:

U266

QI Hongyuan, QIN Fangfang, ZHANG Lei, SHEN Lin, HAO Wenxiao, ZHOU Yongjie, YIN Fang. Modeling and Stress Analysis of Brake Hub of EMU Train under Running State[J]. Journal of Mechanical Engineering, 2019, 55(5): 97-103.

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