Influence of Posture Change on Train Running Safety under Crosswind

Yan, Jian; Chen, Tefang; Cheng, Shu Kei; Deng, E.; Yang, Weichun; Guo, Shuaihan; Guo, Zhancheng

doi:10.3390/app11136067

Cited by 2 publications

(1 citation statement)

References 22 publications

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“…Liu et al (2017) investigate the transient aerodynamic characteristics of vans overtaking in crosswinds at specific overtaking positions. The transient aerodynamic loads of trains are available by Yan et al (2021aYan et al ( , 2021b based on the unsteady Reynolds mean Navier-Stokes turbulence model. Winkler et al (2016) evaluate the necessity to perform a full dynamic coupling, i.e.…”

Section: Introductionmentioning

confidence: 99%

Safety analysis of road vehicles overtake on cables-Stayed bridge under crosswinds

Chen

Wang

et al. 2022

Advances in Structural Engineering

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It is inevitably to encounter overtaking events as vehicles pass through long-span bridges under crosswinds. The effects of the aerodynamic interference on the dynamic responses of the overtaking vehicles should be taken into account in the analysis of the driving safety of vehicles under crosswinds. The time-varying aerodynamic coefficients of the overtaking vehicles are obtained by scale model wind tunnel tests. A vehicle dynamic model is established for the analysis of the dynamic responses of articulated lorry. Based on the coupling vibration framework of the wind-vehicle-bridge system, an improved dynamic analysis system is constructed to solve the transient aerodynamic responses of the overtaking vehicle. It investigates the effects of the overtaking events on the driving safety of vehicles on bridge deck under crosswinds. The results show that the interference aerodynamic forces produced during the overtaking process have significant influences on the dynamic responses of vehicles. The maximum load transfer ratio and side-slip factor of vehicles in consideration of the effects of overtaking event are much greater than the case taking no account of the interference aerodynamic forces. Although the overtaking event do not play a decisive role in the driving safety of vehicles crossing the bridge, it is necessary to consider the combined adverse effects of the overtaking event and crosswinds on the safety of vehicles.

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Section: Introductionmentioning

confidence: 99%

Safety analysis of road vehicles overtake on cables-Stayed bridge under crosswinds

Chen

Wang

et al. 2022

Advances in Structural Engineering

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Unsteady aerodynamic characteristics and dynamic performance of high-speed trains during plate braking under crosswind

Liu

Zheng

et al. 2023

Nonlinear Dyn

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As one of the key technologies of the train, the braking system plays a vital role in ensuring the safe operation of the train. Plate braking has the characteristics that the higher the train speed, the better the braking effect, and it can be used as one of the options for emergency braking of the high-speed train.The dynamic grid technology is used to realize the plate movement, and the unsteady aerodynamic characteristic simulation of the train in plate braking process is realized based on the IDDES with SST k-w turbulence model. The formation and evolution of the ow eld in the process of plate braking are analyzed by the visualization technology, and the in uence law of plate opening on the aerodynamic forces of each car under the crosswind is explored. By loading the aerodynamic forces into the vehicle system dynamics model for calculation, the safety indexes (derailment coe cient and wheel load reduction rate) of the plate braking train under crosswind with different speeds are obtained. The results show that the rapid opening of the plate provides a large braking force for the train, but it destroys the stability of the ow eld around the train, especially the ow eld above the train, and the above phenomenon further aggravated by crosswind. The aerodynamic force distribution of each car in the train was signi cantly changed by crosswind, the proportion of the lateral force of the head car in the train is signi cantly increased, and the aerodynamic forces of each car were further increased by the opening of the plate. From the perspective of vehicle dynamics performance, with the increase of crosswind speed, the derailment coe cient and wheel load reduction rate of each car increase obviously, and even derailment and overturn occur. Under the crosswind, the dynamic performance of the head car is the worst, and it was further deteriorated by opening of the plate. The impact of the tail car is relatively small, and the dynamic performance of the head car can be used to evaluate the safety of the train. It is recommended to avoid opening the plate of the head car in strong crosswind.

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Influence of Posture Change on Train Running Safety under Crosswind

Cited by 2 publications

References 22 publications

Safety analysis of road vehicles overtake on cables-Stayed bridge under crosswinds

Safety analysis of road vehicles overtake on cables-Stayed bridge under crosswinds

Unsteady aerodynamic characteristics and dynamic performance of high-speed trains during plate braking under crosswind

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