Analysis on Key Influencing Factors of Longitudinal Force with 30 000 t Heavy Haul Trains in Braking Conditions
A longitudinal dynamics simulation model for long heavy haul trains was established to ensure the regular and safe operation of 30 000 t heavy haul trains,and verified by heavy haul train test data of Watang—Rizhao Railway Line.The model was used to analyse the influence of electronically controlled pneumatic braking system,synchronous handling performance,gradient difference at grade changing points and vehicle axle load on the longitudinal force of 30 000 t heavy haul trains in braking conditions.As the results show,the maximum coupler pressing force of 30 000 t heavy haul trains with 25 t axle load using ECP braking system can be reduced by 25％～55％compared with using LOCOTROL synchronous control technology under emergency braking.In case of wireless communication failure,the pressure reduc-tion of combined trains when braking shall not exceed 50 kPa on the 8‰ gradient difference of V-shaped slopes.The maximum gradient difference of combined trains in A-shaped and V-shaped slopes is 13‰ and 10％o.The 30 000 t heavy haul train with 30 t axle load can reduce the coupler force by about 40％under full service braking and emergency bra-king compared with 25 t axle load group.
heavy haul trainlongitudinal dynamicswireless communication failuregradient differencevehicle axle load
万方数据
维普
