Abstract
Using aerodynamic resistance to provide braking force for trains is an economical braking method. It has few components to wear out and requires no energy. But the aerodynamic braking plate will significantly affect train’s aerodynamics behaviors. This paper studies the effect of the braking plates’ layout on the aerodynamic force of head car when a train is running under a crosswind. The results show that the braking plate will not only increase the drag force, but also significantly affect the lift and lateral force of the train’s head car. The installation position of the braking plates will also have a great effect on the aerodynamic force. In order to increase the drag force and weaken other aerodynamic force changes of the head car, we suggest that the first braking plate be arranged at the end of a streamlined shape, and the second braking plate be arranged at the middle of the car body. Compared with trains without braking plates, the head car’s drag force increases by 85.7%, lift force only increases by 7.6%, and side force decreases by 5.9%, when the braking plates are in operation.
Highlights
The traditional braking methods include friction braking, eddy current braking, and so on
The braking plate will change the drag force, and significantly change the side and lift force when the train is running under a crosswind
The influence of the braking plate on the aerodynamic force of the train should be taken into account when designing and arranging it
Summary
The traditional braking methods include friction braking, eddy current braking, and so on. Studied the contribution of braking plates to the total braking force of trains at different speed levels. Gao et al [8] researched the effect of the angle of the braking plate on the braking force without crosswind. It is necessary to research the effect of the braking plate on the aerodynamic load of the railway vehicles under typical wind speed and find a solution that can improve the braking effect of trains, and reduce the adverse effects of side force and lift force. In combination with the surrogate model method, we explored the effect of installation positions of the two braking plates of the head car on the aerodynamic force and obtained the internal law between the installation position of the braking plates and the aerodynamic force. We obtained a layout with high drag force, low side force, and lift force
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