A heavy-haul train dynamics model considering basic braking device and its safety analysis under curve braking
During emergency braking,heavy-haul trains encounter intricate dynamic issues that markedly affect the safe operation of the vehicle.A combined one-dimensional and three-dimensional dynamic model,accounting for basic breaking device,is developed to examine the impact of the braking system on heavy-haul train dynamics.This model reflects the effect of factors such as the variation motion of the three-dimensional vehicle and brake shoe-tread friction on the braking performance of the train.The effectiveness of the proposed model is validated by experimental data and other model comparisons.Based on this,an analysis is made on the wheel-rail dynamic interaction and operational safety of the 10000-ton heavy-haul train at the most hazardous location on the curve section during emergency braking.Our results indicate the basic braking device considering the brake shoe-tread friction exerts little impact on the trend of coupler force and the position of the maximum value during emergency braking.The brake shoe braking model exhibits a more significant axle load transfer,which is consistent with the friction characteristics of the brake shoe and wheel during the actual braking process.When the curve radius is reduced from 1400 m to 600 m,during emergency braking,the derailment coefficient and overturning coefficient rise by 340.35％ and 31.72％ respectively.
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