| China’s high-speed railroad system has become one of the most developed high-speed railroad networks in the world.As the passenger flow of China’s high-speed railroads is very large,with the annual passenger traffic expected to reach 1 billion in 2023,some sections of the main railroad lines cannot cope with the travel demand of large holidays such as May Day and National Day.In China’s territory,high-speed railroad 350 km/h speed class train tracking interval is generally 5 minutes,individual lines have the potential to achieve 4 minutes to lay the map.When the train speed is greater than 300 km/h,the arrival tracking interval time of large stations on mainline railroads becomes the main factor limiting the tracking interval,so in order to effectively alleviate the problem of capacity constraint on mainline can start from compressing the arrival tracking interval.The arrival tracking interval was compressed by the combination of the optimized interval advance speed reduction and the optimal key switch strategy.The speed control is set at different locations in the station near the blocking partition,and the impact of the interval speed control location on the arrival tracking interval is analyzed by balancing its interval and arrival tracking interval time,and how to select the key switch based on the segment unlocking for picking up incoming trains is analyzed,and the formula for calculating the tracking interval time under the dual strategy is derived.Finally,by analyzing the effect of dual strategy on the tracking interval time,the goal of optimizing the tracking interval is achieved.The specific simulation takes CRH380 BL as the experimental object and Hongqiao station as the experimental scenario,firstly,the arrival tracking interval under 300 km/h speed class is statically checked and the correlation between arrival tracking interval and speed class is analyzed.Then the topological model of the road network under ideal conditions and the intelligent body tracking module for front and rear trains are established,including traction calculation and operation decision mechanism,and the calculation of acceleration and how to judge curve acceleration by identifying track lines in practical application are analyzed in detail.Finally,the simulation model of high-speed railroad train tracking operation is constructed,and the simulation experiments are based on the changes of train interval tracking and arrival tracking interval time under the speed control of six close blocking partitions of Hongqiao station yard and downstream approaching interval,and all key switchs combined with the pickup scheme,and the combination of dual strategies,to compare and analyze the effect of compressed arrival tracking interval time under the dual strategies separately and combined.The simulation results show that:(1)Implementing interval speed control at reasonable locations in the first,second and third approaching blocking partitions can achieve the effect of effectively compressing the arrival tracking interval of trains;(2)When choosing different key switchs to pick up trains,the closer the key switch is to the entrance of the station,the shorter the train arrival tracking interval time;when choosing the same associated switch for the front and rear trains,the longer the front train pick up approach,and the opposite for the rear train,the shorter the arrival tracking interval time;(3)The combined strategy of choosing a reasonable approaching interval position to implement interval speed reduction control and choosing the optimal key switch pickup approach can shorten the arrival tracking interval to the maximum of 151 seconds. |
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