Study On Full-time Operation Organization Of The Express/Local Train For Urban Rail Transit

With the increasing network density of urban rail transit,the extension of existing rail lines and the opening of the long distance rail lines' construction become development hotspots.Express/local train operation is a method to satisfy long distance rail characteristics of passengers' flow and operating.Its can improve operation efficiency and service level for urban rail transit system through reasonable set the train stop position and quantity.However,compared with all stop train operation and express/local train operation,compiling express/local train operation needs to consider much more factors,and operating organization is more complicated.Threrfore,the study of express/local train operation optimization problem for urban rail transit has important theoretical significance and application value.The main work of this paper is as follows:(1)On the basis of introduce domestic and foreign typical express/local train operation,analyzes different kinds of urban rail transit operations and their respective advantages and disadvantages,and uses system dynamics method analysis express/local train operation,so that provides a theoretical basis of how to bulid express/local train optimization model.(2)This paper from the viewpoint of analyzing characteristics of passenger flow,proposed generation method and process of full-time express/local train operation,and focus on study two key problems,one is proposing generation method of overtaking operation for express/local train according to the actual rail conditions,the other is using the Euclidean distance square method to merge full-time express/local train operation.(3)This paper studies different passengers' behavior on choice of express/local train,quantitative analysis of passenger travel time through random benefit function,and in order to better describe passengers' travel behavior,this paper proposes a penalty function about load factor in the train to punish carriage crowded situation on passengers' travel time.Then determine the time value of passengers through the Binary Logistic analysis,and make the index of the time value of passengers being dimensionless.(4)On the basis of fully studied passengers' travel time,considering the operating cost at the same time.Minimizing passengers' travel time and operating cost as objective fuction,with constraint conditions of departure interval?fixed overtaking stations and so on to bulid urban rail transit express/local train optimization model,and propose a modified genetic algorithm combining with simulated annealing algorithm to solve the optimization model.(5)Taking an urban rail transit line of City L as a example to solve the optimization model.Gain full-time urban rail transit express/local train operation and its overtaking operation.From the view of reduce operational complexity and convenient for passengers to accept,merge thirteen different operation of a day into peak and off-peak two kinds.Analysis results through accumulate index of full-time's objective fuction shows that,compared with optimized full-time express/local train operation and all stop train operation,passengers' travel time reduced by 20.19%;operating cost reduced by 8.13%before combination,while two index of objective fuction reduced by 8.89%and 4.98%after combination.