Study on braking safety speed threshold of high-speed train equipped with wind resistance braking device under crosswind environment

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Journal of Vibration and Shock ›› 2025, Vol. 44 ›› Issue (10) : 250-260.

XIE Hongtai1,2, WANG Hong*1, TANG Jinsong3, WANG Yunfei4

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Abstract

In order to ensure the safety of wind resistance braking of next-generation high-speed trains equipped with wind resistance braking devices in harsh wind environments, according to the existing research results on the design of wind resistance braking machine, working attitude and system layout, a certain type of standard locomotive set as a reference was equipped with 8 sets of "butterfly" wind resistance braking devices, and the aerodynamic model of the train and the dynamic model of vehicle track system under the effect of crosswind were established respectively. The dynamic behavior of the high-speed train assembled with wind-resistant braking device was simulated and calculated under wind load, and the safe speed threshold of wind-resistant braking was determined through the evaluation of the safety indexes of train operation. The results show that under the action of crosswind, the stability and safety of high-speed train operation with wind resistance braking device is mainly controlled by the head car, when running at 200~400 km/h, the aerodynamic coefficient is in quadratic nonlinear relationship with 0~30 m/s crosswind, with the increase of crosswind strength, the growth rate of drag coefficient decreases gradually, and the growth rate of lateral force coefficient and lift coefficient increase gradually; the rate of wheel weight load reduction is the controlling indicators of 200~400 km/h wind resistance braking safety assessment, in the wind speed of 10~30 m/s range, There is an approximately linear correlation between wheel load shedding rate and the operating speed; Referring to national technical standards and relevant test data, the wind resistance braking safety speed zone calculated by simulation effectively falls within the train operating safety zone, When operating in 20 m/s cross-wind environment, the safe speed of wind resistance braking does not exceed 186.1 km/h; in 15 m/s crosswind environment, the safe speed of wind resistance braking does not exceed 324.6 km/h; in 10 m/s crosswind environment, the safe speed of wind resistance braking does not exceed 370.1 km/h. The crosswind wind speed and the safe speed area of wind resistance braking derived from this paper can provide technical reference for the optimized design and the operation and safety control of the wind resistance braking device.

Key words

High-Speed Trains / Aerodynamics / Wheel-Rail Dynamics / Wind Resistance Braking Device / Cross Wind / Braking Speed Threshold

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XIE Hongtai1, 2, WANG Hong1, TANG Jinsong3, WANG Yunfei4. Study on braking safety speed threshold of high-speed train equipped with wind resistance braking device under crosswind environment[J]. Journal of Vibration and Shock, 2025, 44(10): 250-260

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