坡道上重载列车纵向冲动研究

针对重载列车实际运用中在复杂纵断面紧急制动时导致列车纵向冲动过大的问题，应用空气制动系统和纵向动力学联合仿真系统，研究重载列车通过坡道时纵向冲动水平，以及坡道上列车制动起始位置、坡道坡度大小和列车制动波速等因素对列车纵向冲动的影响。结果表明列车完全处于同一坡道上坡或下坡制动时与平道时的冲动水平相当。列车在通过平道+上坡或下坡+平道时做紧急制动会产生较大的车钩力压力，1万吨编组列车第40车位于变坡点是最不利的制动起始位置。列车在变坡点的纵向冲动主要受到制动不同步性和坡道坡度两种因素影响，坡道坡度越小，列车的纵向冲动水平越小；提高制动波速能有效减小车钩力。

Influence of Ramp on Longitudinal Impulse of Train

Referring to excessive longitudinal impulse of heavy haul trains in practice when trains make emergency brake at a complex longitudinal section, by using of air braking system and train longitudinal joint simulation system, studied on heavy haul train longitudinal impulse level through the ramp. And the influence of the braking start position、the ramp slope size and train braking velocity on the train longitudinal impulse. The results show: The impulse level is same when heavy haul trains make emergency brake completely at the same ramp uphill or downhill compared with it is at a flat track. It will generate coupler force significantly when heavy haul trains make emergency brake at a complex longitudinal section (such as flat add uphill or downhill add flat ) , For ten thousand tons trains the most dangerous braking position is the fortieth freight car of the train on the ramp. The brake synchronism and the slope of the ramp are the two main factors that influence the longitudinal impulse occurs on grade change point .The ramp slope is smaller, the smaller the train longitudinal impulse level.Increase brake synchronism will reduce longitudinal impulse significantly.