Analysis Of Longitudinal Dynamic Performance And Energy Consumption Of Heavy Haul Train Under Different Profile

Development of heavy load transportation is the main direction of railway freight transportation in China and all over the world. Heavy haul train has high running speed and great traction quality, which contain huge kinetic energy and potential energy in the operation process of the train. And the energy components such as traction energy, potential energy, braking energy consumption, resistance energy consumption, kinetic energy etc. are related to the setting of the profile. Therefore, it is important to study the variation tendency of energy components in operation of heavy haul train under the condition of different profiles, which has important guiding significance for the selection of energy saving profile and the optimization of the design of profile.In this thesis, combining with the characteristics of heavy rail, the longitudinal dynamic model of heavy haul train was established, the calculation method of energy consumption of heavy haul train was put forward, the performance and energy consumption of train longitudinal dynamics were analyzed under the condition of uphill traction and downhill cycle braking. As well as the longitudinal dynamic performance and the energy consumption of the whole trip were analyzed, making Railway Passage at Central South of Shanxi Province as the engineering background. The main research results are as follows:(1) The maximum harmless grade of 1000t heavy haul train with speed limit 70 was analysed by the longitudinal dynamic calculation method, the results is between 0.795%o and 0.8‰, less than 1.0001%o, calculated by particle kinematics calculation method.(2) The longitudinal dynamic performance and energy consumption analysis of the train starting process were carried out on different uphill sections from 0‰ to 9‰.The results showed that the total energy consumption of the train is increasing rapidly, and the energy consumption is rapidly increasing, which is not conducive to the starting of the heavy load train, with the increase of grade, in steeper slope condition. When i<2%o, the time, distance, energy consumption growth rate is not large, and eventually get a larger proportion of the kinetic energy, therefore suggestions will be overloaded railway station Ping slope limit relaxed from 1‰ to 2‰ under difficult conditions.(3) The longitudinal dynamic performance and energy consumption analysis of the train cycle braking process were carried out on different downhill sections from 1‰ to 13‰. The results showed that the braking energy consumption has always been a large proportion (more than 50%) with the increase of grade, and reached more than 90% when i≥10‰. Regardless of the size of the slope, whether the dynamic braking force is applied, as long as the initial velocity of the train is equal and the running distance is the same, the electric energy input from the outside can be roughly equal.(4) Whole trip longitudinal dynamic performance and energy consumption analysis of heavy haul train were carried out making Railway Passage at Central South of Shanxi Province as the engineering background. The results showed that the main energy consumption is braking energy consumption, and the gravity potential energy is the main energy source. The total energy consumption of train traction is 5614.22kw.h in Changzinan-Shuizhinan, and the braking energy consumption accounted for the main part of the total energy consumption, reached more than 80%.