The Research For Turn-back Capacity Of Urben Rail Transit

With the rapid development of our city,the growing population of the city has caused the city traffic congestion,and urban rail transportation as a new mode of transportation is to alleviate some pressure,but because of the consideration of early line design is not sufficient,the operation amount of early line design is not to meet the growing needs of today during peak time.Therefore,for newly-built lines,it is necessary to design the corresponding station type according to the current needs of the line as well as the later development,and propose a reasonable plan,so as to avoid the situation in which the operation service level is affected due to insufficient turn-back capacity during the peak operation period.On the other hand,for existing stations,the type of turn-back station has been fixed and the type of turnout is not easy to modify.It is necessary to comprehensively consider various factors and propose an optimization plan to improve the transportation capacity of the line.Therefore,this paper puts forward a simulation platform for the turn-back capacity of urban rail transit,and calculates the turn-back capacity according to the type of turn-back station built by the designers.Through the analysis of various influencing factors,the comprehensive evaluation of station type design will provide references for designers in the early stage design and later optimization plan.Firstly,this paper makes a qualitative analysis of the factors that affect the turn-back ability,including the type of turn-back station,turn-back method,type of turnout,speed limit before the station,train formation plan,and stop time of the station.Finally,the above factors are simulated by the emulation software of the turn-back ability and shown in the form of graphics.Next,this paper introduces the traction calculation method of the turn-back calculation in detail,builds the train speed adjustment model to calculate the elapsed time for the turn-back operation.Then the train turn-back process is analyzed in detail through the control point.We decompose the running time into various time segments.Next we analyze and combine the time segments to obtain the corresponding turn-back time calculation method.Finally,a simulation platform for the ability of turn-back was built and a method for researching the turn-back ability based on graphic element control was proposed.After building the turn back station type by the graphic control,the device attachment and data entry operation,it can calculate the turn-back capability of the station and display the operation process and result in the way of report and graphics.Then we will use AnalyticHierarchy Process to establish the AHP model of influencing factors on the turn-back capability of urban rail transit to calculate the weight of each influence factor.It provides a reference for the design of the prophase turn-back station and the optimal design of the later turn-back capability.