Simulation Study Of High-Speed Railway Point Line Capability Coordination Based On Series And Parallel Point Line Structure

The current railway transportation capacity in China cannot meet the transportation demand,and some stations,especially hub stations,are easy to become the limitation of network capacity in the peak period.It is an urgent problem to be solved how to rationally organize and use high-speed railway facilities so as to coordinate the utilization of point-line capacity between stations and sections.This paper first summarizes the constitution and characteristics of high-speed railway system’s passing capacity,summarizes the connotation and types of high-speed railway point-line capacity coordination,and determines its influencing factors.Secondly,a coordination evaluation model of high-speed railway point-line capacity based on simulation and entropy weight method is proposed.Through simulation,the mutual operation between points and lines in actual operation.Take the train delay time and the number of delayed trains as negative indicators,and the number of trains passing through as positive indicators.Based on the entropy weight method,the index weight and the comprehensive evaluation index of each subsystem were obtained,and the ratio of the comprehensive evaluation index was taken as the coordination degree,and the coordination degree grade was divided.Then,taking the area from the hub station to the adjacent station’s the arrival and departure track as the research scope,a high-speed railway system model containing multiple point and line systems with a series and parallel point-line structure,a high-speed railway system model containing multiple point and line systems with a series and parallel point-line structure is constructed.At the same time,based on this model,combined with the arrival and departure line application scheme,a simulation calculation model of train interval is proposed.Then,based on the iteration of train interval,the point-line coordination of pointline series and parallel high-speed railway system under segment-unlocking is simulated and analyzed.According to the train type,the operation type of stations at both ends of the interval,and the available arrival and departure tracks can take initial train interval,calculate the arrival time and the actual occupied departure track to get the actual train interval,then check whether the change of train interval causes deviation of departure time and arrival time.If the departure time or arrival time is advanced or delayed,and the established operation of stations at both ends of the interval is affected,the simulation clock will be turned back for the next iteration.At the same time,to prevent the simulation from falling into an infinite loop,the threshold of the number of iterations between trains is set.Finally,Shenzhen North Railway Station and its adjacent stations and connecting areas are taken as examples.The effectiveness and feasibility of high-speed railway point-line capability coordination simulation model based on series and parallel point-line structure and high-speed railway point-line capability coordination evaluation model based on simulation and entropy weight method.