Study On Train Routing Planning Of Y-type Line Of Urban Rail Transit Based On Travel Purpose

With the construction and development of urban rail transit lines,Y-type lines are gradually emerging as a new form of line.Compared with traditional single lines,Y-type lines have the characteristics of complex passenger flow and wide service range.How to formulate efficient train routing of Y-type line to improve service and reduce the cost of operation enterprises under the condition of meeting the passenger flow demand,an important subject in the field of operation and management of urban rail transit.This paper chooses Guangzhou Metro Line 3,the first Y-type line in China,as the research object.Firstly,the passenger flow structure of Guangzhou Metro is analyzed.According to the characteristics of passenger flow,a passenger flow allocation method which conforms to the actual passenger flow selection law is established,and a train routing solution model with minimizing passenger cost and enterprise operation cost as the objective function is constructed.The solution algorithm based on graph traversal and enumeration is designed.Finally,the peak value of Guangzhou Metro Line 3 in the early peak period is obtained by solving the model.The validity of the model is verified by comparing the optimal traffic plan with the actual traffic.The main work and conclusions of this paper are as follows:(1)On the basis of the existing research,this paper combs three modes of Y-line branch line independent operation,through operation and mixed operation,and divides the factors affecting Y-line train routing plan into three categories:facilities and equipment,operation management organization level and passenger flow characteristics.(2)The SP questionnaire survey of Guangzhou metro passenger flow shows that the purpose of travel,income level and route choice of passengers are significant in their own attributes.The rules of route choice of passengers for different purposes are analyzed.The concept of marginal replacement rate is used to obtain the general cost of passenger travel.The Logit model based on the purpose of travel for Guangzhou Metro Line 3 is constructed and the parameters are calibrated to make the passenger flow distribution more realistic.(3)A Y-type line train routing model is constructed,which is constrained by the line capacity,the length of the route and the total number of routes,and takes the minimization of passenger travel cost,the minimization of the purchase cost of enterprise trains and the minimization of the running kilometers of trains as the objective functions.An algorithm based on graph traversal and enumeration is designed,and the concept of alternative intersection set is introduced to reduce the solution range effectively.(4)Taking Guangzhou Metro Line 3 as a case study,the optimal route planning is obtained.The results show that the optimal train routing plan solved by the model can reduce the number of departures,passenger travel costs and the total cost of passengers and enterprises on the basis of satisfying passenger demand,thus verifying the validity of the model.(5)Through the analysis of enterprise weight sensitivity,it explores its influence on the train routing plan.It is found that:1)the optimal route form of the model is related to the enterprise weights.When the enterprise weights are small,the branch line independent operation scheme should be adopted,and when the weight is large,the three-way mixed operation scheme should be adopted;2)With the increase of the enterprise cost weight coefficient,the enterprise cost decreases while the passenger cost increases.Considering the high cost of the enterprise,the combination of three routes should be adopted to effectively reduce the number of routes departure,so as to reduce the operating cost of the enterprise.(6)Through the sensitivity analysis of passenger flow structure to explore its impact on train routing plan,it is found that:1)the optimal routing plan is related to passenger flow structure,and different passenger flow structure will affect the optimal routing plan;2)when the proportion of commuting passengers is large,the traffic plan with the smallest travel time is adopted;when the proportion of leisure passengers is large,the traffic plan with the smallest transfer time is adopted;and when the proportion of leisure and play passengers is large,the traffic plan with the smallest transfer time is When the passenger flow of business and office is large,the transportation with the lowest enterprise cost is adopted.The analysis shows that the choice of the optimal route has the same trend as the choice preferences of all kinds of passengers in the survey results,which proves the validity of the passenger flow assignment model.