Test And Simulation Study On Traction And Brake System Of Combined Heavy Haul Train

Heavy haul is an important direction for the development of railway freight technology world widely. At the end of 2003, in order to meet the requirements of national economic development, MOR made the important decision to accelerate the heavy-haul technical innovation & capacity-expanding reconstruction and quickly enhance the transport capacity of Datong-Qinhuangdao Line ("Daqin Line"). Operating 20000-ton combined heavy haul train is a key technical measure for the quick capacity expansion of Daqin Line.Under the background that 20000-ton combined heavy haul train will be run at Daqin Line and relying on related projects supported by MOR, this paper carries out research on test and simulation of the traction & brake system of 20000-ton combined heavy haul train running on Daqin Line. By referring to plentiful previous researches, and through deep-going and careful theoretical analysis, this paper has established a platform for the simulation of combined heavy haul train; and on this basis, with the combination of simulation and test, thorough research on running 20000-ton combined heavy haul train on Daqin Line is conducted. The paper thoroughly analyzed the two key techniques (ECP and Distributed Power control) internationally adopted in the brake system of combined heavy haul train at present, established related models of ECP brake system and distributed power control for the first time at home. A test platform for AC-driven system applicable to the performance test of the traction system of high-power AC-driven electric locomotive at Daqin Line was developed, and test study on traction capacity of train with different locomotive marshalling, synchronism of DP system, and the performance of the control system of locomotive was conducted. Based on the results of simulation and test research, this paper has assisted operation department to complete the improvement and optimization of handling of 20000-ton combined heavy haul train on Daqin Line, and realized safe operation of 20000-ton combined heavy haul trains with different locomotive marshalling when paying concurrent attention to thermal load of wheels and reducing the abrasion loss of brake shoe. In addition, on the basis of reasonable handling techniques of combined heavy haul train, this paper has developed automatic train operation codes for combined heavy haul train, which is a new tool for the simulation of heavy haul transport. With modern computational fluid dynamics (CFD) method, this paper has carried out numerical simulation about the dynamic process of air flow inside the brake pipe system of combined heavy haul train, and established a 3D air-charging model for the air brake pipe system of heavy haul train. Related findings may be applied to the performance analysis and design of the brake system of combined heavy haul train.The research in this paper is of important engineering application value for the test and safe operation of 20000-ton combined heavy haul train on Daqin Line.