基于DEM-MFBD-CFD方法的冰雪飞溅击打应答器力学研究

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Abstract The problem of ice and snow splashing in severe cold areas has a direct impact on the safety of high-speed railway operation. Field investigation found that multiple ice blocks fell off and hit the transponder, but this research has not been reported in the literature at home and abroad. In this paper, the DEM-MFBD-CFD coupling analysis method is used to establish the model of the ice-shedding hitting transponder on the floor of the carriage, and the reliability of the model is verified by the wind tunnel and field test results. Based on the established analysis model, the influence of different train speeds, wind pressure changes, ice mass and other factors on the force of transponder striking is studied. The results show that the maximum stress on the transponder increases exponentially with the train speed. When the train speed increases to 350 km / h, the maximum stress reaches 15.591 MPa, which is about 3.5 times that of 150 km / h. With the increase of ice mass, the maximum stress of the transponder increases rapidly and then increases slowly. When the crosswind wind speed is 5 ~ 20 m / s, the maximum stress on the surface of the transponder is not much different, indicating that the effect of the crosswind on the ice and snow hitting the transponder is negligible. In order to reduce the harm of snow and ice splashing on the transponder, measures such as snow melting and train speed reduction can be taken.

Key words： Snow splash discrete element method distinct element method-multi flexible body dynamics- computational fluid dynamics（DEM-MFBD-CFD） coupling analysis method transponder mechanical response

Received: 28 January 2023 Published: 28 December 2023

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	Articles by authors
	LU Kun4
	CHI Yihao1
	2
	XIAO Hong1
	2
	QIE Luchao3
	ZHANG Zhihai1
	2
	LU Kun4

Cite this article:

LU Kun4,CHI Yihao1,2, et al. Mechanical research of ice and snow splashing transponder based on a DEM-MFBD-CFD method[J]. JOURNAL OF VIBRATION AND SHOCK, 2023, 42(24): 290-297.

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2023/V42/I24/290

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