| With the continuous expansion of urban scale in China and the substantial growth of urban population,the difficulty and cost of transportation for residents also increase,and urban rail transit has developed rapidly.At present,most of the urban rail transit lines in China adopt the traditional train operation scheme of single routing,single marshalling and stopping at each station.However,for lines with long total mileage,large distance between stations and uneven distribution of passenger flow,this simple train operation scheme will reduce the comfort of passengers in large passenger flow sections,while causing waste of train capacity in small passenger flow sections.In order to optimize the train operation scheme under this line condition,this paper comprehensively considers the characteristics of passenger flow and various influencing factors of train operation scheme,takes the linear urban rail transit line as the research object,and conducts an optimization study on the train operation scheme of urban rail transit.The main research of the paper is as follows:(1)This paper systematically analyzes the characteristics of urban rail transit passenger flow,and focuses on the discussion of passenger flow OD,section passenger flow,and passenger flow distribution characteristics.This paper summarizes the basic concepts and contents of train operation scheme,and analyzes the applicability,advantages and disadvantages of various routing forms,various marshalling types and various stopping schemes according to the characteristics of passenger flow.Then,the influencing factors of train operation scheme are analyzed from four aspects: passenger travel demand,driving conditions,transportation resources and operation organization,passenger travel cost and enterprise operation cost.A method of dividing the train running time by cluster analysis based on the characteristics of passenger flow is proposed,and the basis for the location selection of the turnaround station is discussed.(2)This paper establishes an optimization model of train operation scheme for urban rail transit linear lines,which can simultaneously optimize train routing scheme,train marshalling scheme and train stopping scheme.The first sub-model aims at minimizing the operating cost of the enterprise,and comprehensively considers the constraints of train stopping and interval coverage,turn-back capacity,number of operating vehicles,passenger flow and travel interval,and operating conditions.The second sub-model aims at minimizing the travel cost of passengers,and builds a directed service network based on a given route.Considering the constraints of passenger flow conservation and capacity limitation,a directed network passenger flow allocation sub-model is established.Finally,the train operation scheme optimization model of urban rail transit is a multi-objective optimization model,and the algorithm combining particle swarm optimization algorithm and genetic algorithm(PSO-GA hybrid algorithm)is designed.(3)Taking a western urban rail transit line as an example,the solution and the result are analyzed.Based on the analysis of the given line situation and passenger flow characteristics,the relevant parameters of the model are given,and the optimization scheme of train operation is obtained,and the optimization result is compared with the existing scheme of the line.The result shows that compared with the existing train operation scheme of the line,the train operation optimization scheme obtained by solving the model can reduce the operating cost of enterprises and passenger travel cost at the same time.Then,the sensitivity analysis is carried out from the aspects of weight coefficient,maximum number of train routing on the line,set of train marshalling,and train stopping plan.There are 42 pictures,16 tables and 68 references. |
