The Study On Train Diagram Optimization Of High-speed Railway Based On Regional Coordination

At present,China’s high-speed railways use the traditional railway transportation organization model,which is based on a large number of direct passenger trains running between large railway passenger stations.This determines that the high-speed railway must adopt the traditional "cross-line first after the line" drawing method,resulting in the whole network operation line is very complex,not easy to adjust,train operation map to cope with market changes and other aspects of the bottleneck.At the same time,the regularity of high-speed railway train operation chart is not strong,which is not conducive to the full play of social and economic benefits of high-speed railway.In order to adapt to the needs of strategic transformation of railway operation,it is extremely urgent to study and innovate the theory and method of formulating the normalized train operation chart of high-speed railway under the condition of largescale complex network.In this paper,we break through the constraint of the theory and method of drawing the train running chart of high-speed railway and study the optimization method of train running chart of high-speed railway based on regional coordination.The main contents are as follows:(1)Research on regional division method based on calculation of spatial transportation linkage.According to the passenger flow intensity,geographical location and other attributes,the calculation method of spatial transport connection degree is determined.Starting from the network nodes,the nodes with the largest neighborhood connection degree are selected to merge,and the constraints such as reasonable running distance of trains and maintenance conditions of EMUS are considered to complete the regional division.Realize the decoupling of the physical structure of the road network and complete the large-scale system decomposition of the whole road network mapping.(2)Study on compiling method of regional trunk line normalized train running chart.On the basis of establishing the compilation method and process of the normalized train operation chart of the main line,the optimization model of the normalized train operation chart is established with the aim of minimizing the total travel time within a unit cycle and maximizing the connectivity between nodes.Taking the actual data of Beijing-Shanghai high-speed railway as an example,the main line train operation chart is compiled to complete the subsystem optimization.(3)Collaborative optimization of regional Train charts based on Cross-line connection.In order to minimize cross-line train connection time,a collaborative optimization model of regional train operation chart based on cross-line connection was established.According to the characteristics of the model,PSO-GA algorithm was designed to solve the problem,and the route selection scheme of some cross-line trains in Beijing and Shanghai was obtained,which reduced the total connection time by 9.7%.The feasibility and effectiveness of the model and algorithm were verified,and coordination among subsystems was completed.