Analysis Of Train Pneumatic Braking System And Longitudinal Dynamics Research

In order to satisfy the ever-increasing demand for railway transportation, the operation of heavy haul trains is regarded as unavoidable. The force analysis of the heavy haul trains is comparatively complicated than that of the ordinary trains due to the following factors: the heavier weight and longer length of the trains, the heavier weight of the axle, the increasing of the draw force and braking force, more time needed when break wave delivers. Serious challenge was given by the coupler broken, coupler dislocated, derailment which caused by oversize of the longitudinal force, to ensure the safety of freight transportation has become the key problem of our country developing in heavy-load transportation.In order to control the longitudinal force, firstly, the paper analyzes the air brake system and focuses on how to speed up the braking wave. The limitation of the speed of brake wave leads to the non-synchronization of the trains' braking, and than making the longitudinal force increases exceedingly. Secondly, the paper introduces the technology of Electro-pneumatic, and focuses on the technology of synchronization brake when the train goes through in the tunnel. The control order was given to slave control locomotive from the master control locomotive by serial communication, therefore the synchronization brake is realized and the safety of the heavy-load train is ensured when it is running in tunnel. At last, based on model that had been built, we have developed an integrated model of train longitudinal dynamics in Matlab/Simulink software. Compared the results of the simulation model at the condition of train braking, emergency braking with the results of the relevant documents and experiments, it can be seen that the simulation result is consistent with the experimental data, so the reasonableness of the model is validated. It summarizes the five key factors which affect the longitudinal jerk, and to achieve the goal of reducing the longitudinal jerk by ameliorating the five factors.