Study on Timing Matching Strategy of Air-electric Combined Braking for Heavy-haul Combined Trains
Heavy-haul trains need to adopt air-electric combined braking mode when running on long ramps where air brakes and locomotive electric brakes are used in conjunction to ensure that the train has a sufficiently large braking force so as to avoid accelerating too fast.The mass of the heavy-haul train is very large and the braking method may cause the superposition of the coupler force,which will lead to a greater longitudinal impulse,and even threaten the safety of train operation in serious cases.In addition,the heavy-haul combined train adopts the distributed power mode,and the slave control locomotive acts as one of the air brake signal propagation sources and power braking sources,which leads to a more complicated force compared with the single-unit train.Based on the air flow theory and the principle of multi-rigid body dynamics,the article establishes the simulation model of 10,000 t and 20,000 t heavy-haul combined trains,analyzes the influence of the timing matching strategy of the application of air-electric combined braking mode on the longitudinal impulse,and proposes the application strategy that can reduce the longitudinal impulse.The results show that by adjusting the application timing of air brake and electric brake together,the superposition of the pressure coupler force generated by air brake and electric brake can be avoided,or the pulling coupler force generated by air brake can offset part of the compressive coupler force generated by electric brake to effectively reduce the coupler force of the train,thus providing theoretical basis and data support for the optimization of braking strategy of heavy-haul combined trains.
万方数据
维普
