Wheel-rail Interaction Mechanism and Derailment Suppression Technology for Train Collision Accidents

doi:10.12382/bgxb.2023.0752

Abstract

Abstract:

With the continuous increase of operating mileage of railway, the accidents induced by train collision are difficult to avoid entirely, which will cause heavy casualties and property losses once an accident happens. A finite element model of three-marshalling train is established to reduce the risk of the train derailment in collision accident as much as possible, in which the energy absorption device at the end of train and the wheel-rail contact state are considered. The dynamic responses of the wheelset caused by the train colliding with a movable obstacle and a rigid wall are simulated, respectively. The influences of train speed and collision angle on train derailment behavior are discussed. Furthermore, a derailment suppression device, which has the functions of lateral and vertical limits, installed on the bogie is proposed. The motion attitude, displacement and roll angle of wheelset, and the wheel-rail contact force before and after the installation of the derailment suppression device are analyzed and compared. The results show that the train derails in the form of lateral movement/lift coupling after the collision;the derailment suppression device can be used to adjust the motion posture of wheelset to a certain extent after the collision accident, and also limit the lateral movement, lifting and rolling motion of wheelset. The part of the wheel-rail contact force can be borne by the derailment suppression device, which causes the wheel-rail system to quickly recover to the normal contact state. The proposed device was demonstrated to have a certain derailment suppression ability. The obtained results can provide theoretical basis and technical support for collision passive safety design.

Key words: train collision, finite element analysis, derailment mechanism, limiting device, railway safety

CLC Number:

U271.91

LIU Teng, ZHOU Xiongfei, WANG Chengquan, JING Lin. Wheel-rail Interaction Mechanism and Derailment Suppression Technology for Train Collision Accidents[J]. Acta Armamentarii, 2023, 44(S1): 67-78.

Figures/Tables 15

Fig.1 Finite element models of train collision

Fig.2 Finite element simulation of train collision

Fig.3 Responsive posture of train body

Fig.4 Wheel-rail contact force of wheelset 1

Fig.5 Wheelset displacements caused by the train colliding with the movable obstacles and the rigid wall at different speeds

Fig.6 Effects of different train speeds on roll angle

Fig.7 Effect of collision angle on wheelset displacement

Fig.8 Design scheme of derailmentsuppression device

Table 1 Material properties for derailment suppression device

材质属性	参数
材料名称	高强度合金钢NM360
屈服强度/MPa	8.00×10²
弹性模量/(N·m^-2)	2.10×10¹¹
泊松比	0.33
切线模量/(N·m^-2)	2.10×10¹⁰
质量密度/(kg·m^-3)	7.85×10³

Fig.9 Stress and strain contours of derailment suppression device after collision with movable obstacle

Fig.10 Stress and strain contours of derailment suppression device after collision with rigid wall

Fig.11 Comparisons of the attitudes of the wheelsets before and after installing the device when colliding with the movable obstacle

Fig.12 Comparisons of the attitudes of the wheelsets before and after installing the device when colliding with the rigid wall

Fig.13 Comparisons of lateral and vertical displacements and roll angle of wheelset

Fig.14 Comparison of wheel-rail contact forces of head car

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