Research On Period Train Digram Compilation And Carrying Capacity Of High-speed Railway

Since the 1990 s,China's high-speed railway is developing rapidly and has formed a high-speed railway network extending in all directions.The Operating mileage continues to grow.High-speed railway has greatly promoted social and economic development and meet the personalized travelling needs of citizens.At present,China's high-speed railway in infrastructure construction technology has been among the forefront of the world.What needs to be studied is to further improve the service quality of high-speed railway by optimizing the transportation organization so as to fully release the transportation potential.Train diagram is the foundation of railway transportation organization.With the advantage of its regularity and high density,the period diagram has been implemented in many developed countries and achieved good benefits.The purpose of this paper is to study the method of compiling period diagram for high-speed railway in China.The specific research content is as follows:First of all,this paper describes and analyzes the characteristics,the concept,application condition of period diagram and its application cases abroad.Then it is concluded that China's high-speed railway has the feasibility of using period diagram.On this basis,the key technologies in the compiling process of period diagram of high-speed railway are studied.It mainly includes the train operation plan formulation of unit period,the computing method of period length,the conflict resolution method of trans-period operating line,the method of unover-line and over-line train path selection.Secondly,the train effective arrival and departure time domain constraint,the safety interval constraint,the section operating time constraint,the stop constraint are taken into account comprehensively,and a unit period diagram compilation model based on the carrying capacity utilization optimization is established.IBM CPLEX software is used to solve the problem.Thirdly,the paper studies the influence of the structural factors of the train diagram,such as the speed difference,cross-line train running,crossing,stopping,train diagram homogeneity and heterogeneity,on the carrying capacity of high-speed railway.And some suggestions are put forward to optimization carrying capacity utilization in artificial train diagram drawing.Based on the deduction coefficient calculation method,an analytical calculation method is proposed to calculate the carrying capacity of the high-speed railway period diagram.This provides a theoretical basis for the formulation of the train operation plan and cycle length of unit period diagram.Finally,combined with the above theories and methods,the period diagram of beijing-shanghai high-speed railway is drawn,and the conclusion that the periodic transportation organization mode is conducive to making full use of the carrying capacity is drawn by comparing with the beijing-shanghai high-speed existing diagram.