Study On Adjusting Tracking Interval Time Of High Speed Railway Train Based On COADP

In recent years,with the continuous improvement of China's high-speed railway construction planning and operation management,China's high-speed railway has reached two-thirds of the total number of high-speed railways in the world,and will exceed 30,000 kilometers,which as the world's longest operating mileage,the highest transportation density,and the largest scale of operation.By 2019,it is estimated that the national railway passenger traffic will reach 3.356 billion,an increase of 9.2% year-on-year,of which the high-speed rail Electric Multiple Units(EMU)will send 2.078 billion passengers,accounting for 60.9%,an increase of 16.8%.The increase of high-speed railway passenger volume also puts forward higher requirements for high-speed railway operation efficiency.Tracking interval is an important index to measure the efficiency of high-speed railway transportation.It is of great practical significance to optimize the tracking interval time of high-speed railway.By analyzing the definition and basic principles of high-speed railway tracking interval,this thesis summarized the main factors affecting the tracking interval of high-speed railway:operation management technology,EMU performance,signal equipment and line conditions.Taking other factors into account,the multi-stage decision making model of dynamic programming and train motion equation were established to divide the target braking distance of high-speed railway train tracking operation into a multi-stage division based on speed segmentation.Based on the simplification of high-speed railway line slope and the addition of additional resistance,Cooperative Optimization Based on Adaptive Dynamic Programming(COADP)algorithm was used to calculate the target braking distance of high-speed railway track operation step by step.The optimal solution of the target braking distance of the target braking distance for high-speed railway train tracking operation was obtained.Based on the calculation formula,the tracking interval time was calculated,and the optimized interval of tracking interval time based on line condition optimization was obtained.By analyzing the calculation method of different kinds of interval time and the force situation(traction force,braking force,basic resistance and additional resistance)during train operation,the train motion equation was established based on the actual line slope data,and the basic resistance and additional resistance were established.According to the proportion of trains on different ramps,the calculation was reduced while ensuring the accuracy of traction calculation.The tracking interval time was calculated and simulated by EMU traction simulation system.The data of Chengdu-Chongqing high-speed railway line were selected to analyze the tracking interval time,and the feasibility and effectiveness of the optimization strategy were verified by simulation calculation.At the same time,it also provided some referencesignificance for railway line selection and line design.