Simulation Research On 16,000t Heavy Haul Combined Train Of Shuohuang Railway

With the development of railway transportation technology,freight trains are taking on heavier loads and running at a higher frequency,and it is no longer enough to run 20,000 t heavy haul trains to meet the demand of transportation capacity.In order to further improve the capacity,Shuozhou-Huanghua Railway optimizes the organization of traffic based on the existing heavy haul train configuration and operates 16,000 t heavy haul trains.The longitudinal impulse and operation of the trains are different from those of 20,000 t trains due to the change of configuration and traction weight,so the longitudinal dynamics of 16,000 t trains are studied by simulation and the existing operation is optimized.The 16,000 t train of Shuohuang Railway is controlled by Shen 8 AC locomotive and SS4 B DC locomotive through wireless reconnection.In this paper,a hybrid configuration control model of 16,000 t trains is established based on the electric traction and electric braking characteristics of AC and DC locomotives as well as the control logic of the wireless synchronization system for double-heading control.In order to verify the accuracy of the established 16,000 t train hybrid configuration control model,the speed and control commands of the train under electric traction and electric braking conditions are compared between simulation and test respectively.And simulations were run on emergency braking,go-stop-go test and cyclic braking of the model.The simulation speed of the above conditions matched the test speed basically.Simulation of low-speed release,the inert force of passing neutral section are performed on the 16,000 t trains,and the simulation of passing small radius curve,the longitudinal impulse simulation results are all within 8.0% difference with the test results,which verifies the accuracy of the hybrid configuration control model and simulation system from multiple dimensions.The simulation system was used to investigate the braking and releasing characteristics of the 16,000 t trains,the longitudinal impulses generated by braking and releasing at different initial speeds and at different reduction amounts of the train pipe pressure.The longitudinal impulses generated by the 16,000 t trains through the long and down ramps were also analyzed.Using the simulation system,we optimized the operation method of the 16,000 t train when passing through the section from Longgong to Beidaniu,and reduced the original operation method of using 4 times reduction air brakes to 3 times reduction air brakes,and reduced the maximum tension and compression force on the coupler by 9.8% and 13.7% respectively when the train was running in this section.