Analysis on Operation Safety of Express Freight Trains in Subgrade-Bridge Transition in Crosswind Environment
Nowadays, the express freight trains develop rapidly, and their load capacity is large and the running speed is high. Due to the bad aerodynamic performance of the car body, operational safety accidents are prone to occur under strong crosswind environmen
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stract. Nowadays, the express freight trains develop rapidly, and their load capacity is large and the running speed is high. Due to the bad aerodynamic performance of the car body, operational safety accidents are prone to occur under strong crosswind environments. At present, there is less analysis on the operation safety of express freight trains entering the subgrade-bridge transition under the crosswind. This paper establishes the dynamic model of the express freight trains entering the bridge-subgrade transition under the crosswind environment, and analyzes the influence rule of the crosswind speed, the operating speed of the train, the variation of the stiffness of the subgrade-bridge transition, and the bending deformation of the rail caused by the postconstruction settlement of the road and bridge structure. The results show that under the crosswind environment, the vertical force of the wheel and rail increases obviously when the train enters the bridge-subgrade transition. The crosswind speed and the deformation of the rail caused by the cross the postconstruction settlement of the bridge structure is the main factor affecting the operation safety of the train. Keywords: Express freight train analysis
Bridge-subgrade transition Security
1 Introduction With the rapid development of economy and society, railway freight transportati1on has shown a trend of logistics development. In order to improve the freight capacity and competition level of railways, railway transportation needs to provide safe and express freight services, and the express freight trains have emerged. The express freight train has a large weight and a fast running speed. When the train enters the bridge-subgrade transition, the operation safety will be reduced. Due to the bad aerodynamic performance of the vehicle body, derailment or overturning is likely to occur in a strong crosswind environment. At present, many scholars at home and abroad, such as Zhai [1], Lei [2], Banimahd [3] and Paixão [4] have conducted many researches on the subgrade-bridge transition and their impact on train operation safety, but few consider the crosswind load at the bridge-subgrade transition. When the train enters the bridge-subgrade transition, the supporting conditions under the track of the © Springer Nature Switzerland AG 2020 M. Klomp et al. (Eds.): IAVSD 2019, LNME, pp. 278–283, 2020. https://doi.org/10.1007/978-3-030-38077-9_33
Analysis on Operation Safety of Express Freight Trains
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bridge and the subgrade are different. On the one hand, due to the inconsistent postconstruction settlement of the road and bridge structure, the rail will be bent and deformed; On the other hand, due to the large difference in the stiffness of the bridge structure, the train load will cause the rail to be bent and deformed, the rail joint angle will be generated in the connecting part of the road and bridge, deteriorating the smoothness of the track, the interaction force between the vehicle and rail will increase, as well as the probability of overturning or
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