Study On Train Operation Scheme Of Y-type Line In Urban Rail Transit With Multiple Groups Considered

The line form of urban rail transit is affected by the urban layout,natural environment and surrounding project construction and other factors,forming a variety of types of lines,in addition to a single linear form,including: U-shaped line,cross type X-shaped line and the Y-shaped line studied in this paper.Y-type line can solve the problem of passenger flow demand in suburban areas,which has important research significance.In this paper,urban rail transit Y-line is taken as the research object(1)This paper analyzes the theoretical basis of the operation scheme of multi marshalling trains.The basic characteristics,advantages and disadvantages and applicability of different marshalling forms are introduced.This paper analyzes the operation scheme of multi marshalling train from three aspects of passenger flow condition,line condition and enterprise benefit.The operation of multi marshalling trains needs to consider the imbalance of passenger flow in time and space,certain line conditions and the benefits of enterprises.Taking Shanghai metro line 16 as an example,this paper analyzes the operation scheme of multi marshalling trains,and summarizes the characteristics of the operation scheme of multi marshalling trains.(2)The theoretical basis of train routing scheme for Y-type line is analyzed.This paper introduces five routing forms of Y-type line,and analyzes their advantages,disadvantages and applicability.This paper analyzes the elements of train routing scheme for Y-type line from three aspects of passenger flow condition,line condition and enterprise benefit.In the Y-type line,the main line passenger flow should be significantly greater than the branch line passenger flow,the line needs to have a certain turn back operation ability,and the benefit of the enterprise is closely related to the routing scheme.Taking Hangzhou Metro Line 1 as an example,this paper analyzes the operation scheme of Y-type train,and summarizes the characteristics of Y-type train routing scheme.(3)This paper establishes a train routing scheme model of urban rail transit Y-line considering multi marshalling.The model aims to reduce the operation cost of operating enterprises and the travel time of passengers,and solves different routing schemes of Y-line.A multi-objective optimization algorithm NSGA-II is designed to solve the model,and the effect of the model is evaluated by the number of on-line vehicle groups,the maximum section full load rate and the average section full load rate.(4)Taking the Y-type urban rail transit line of Z City as an example,based on the OD passenger flow data of the line in the morning and peak hours,using the train routing scheme model constructed in Chapter 4 of this paper,the Pareto optimal solutions of four different routing schemes are obtained through the NSGA-II algorithm,and the traditional genetic algorithm is used to verify the accuracy of the model Sex.According to the Y-type line of the case,in the four routing schemes of main line,branch line through operation routing,main line through operation routing,branch line partially through operation routing,branch line independent operation routing and hybrid operation routing,only the hybrid operation routing can obtain the optimal solution of large and small groups mixed operation,and the other routing optimal solutions are single large groups.Through the linear weighting of the objective function,and the comparative analysis of the number of on-line train groups,the maximum section full load rate and the average section full load rate,it is concluded that the suitable routing scheme for this case is the main line through and the branch line through,and the marshalling situation is a single large marshalling.