抄録
In order to study curving safety of heavy haul train under braking condition, train dynamics model with 1D and 3D wagons was established by numerical method. In 1D model, wagons were simplified as a series of mass points with only longitudinal degree of freedom. All wagons were subject to air brake force, basic propulsion force and coupler force, which could be described by different equations. In 3D model, wagon was composed of detailed car body, bogie and draft gear. Especially, horizontal rotation from draft gear and constraint from brake shoe were taken into account. In this paper, assessment of train curving safety is more focused on comparisons under different running conditions. The results indicate as follows: When passing through curve, wheel-rail lateral force, derailment factor and wheel unloading rate in train model with detailed draft gear are larger than those in single car model, and the three indexes in train model under braking condition are larger than those under idling condition. Also safety indexes of empty car with longitudinal impulse are worse than those of single empty car. With the number of empty cars in train increasing, large longitudinal impulse is bad for train curving safety.
