| With the development of urbanization,the scale of cities is constantly expanding,and urban rail transit has gradually become an important transportation mode connecting urban centers and suburbs in China.In the process of planning and construction of the line,with the continuous increase of passenger flow demand,the types of passenger flow demand are also enriched,and more advanced,efficient,green and humanized transportation service methods will present the mainstream demand.Research on the optimization of multi train sizes scheme for urban rail transit co-line operation can meet the long-distance and cross-regional passenger flow demand with uneven spatial and temporal distribution.To this end,this thesis has done the following work:1.First,this thesis describes the reasons for the formation of Y-shaped lines from three aspects: geographical environment limitation,urban development strategy and major service projects,summarizes the advantages and disadvantages of basic types of Y-shaped co-lines in urban rail transit,and focuses on the influencing factors of Y-shaped co-line operation and operation scheme.Then analyze the connotation,applicable conditions,advantages and disadvantages of the multicommodity operation organization mode based on the change of passenger flow at different times throughout the day.This provides theoretical and methodological basis for the establishment of a multicommodity flow network with a Yshaped co-line operation multi train sizes scheme.;2.Starting from the connection between the multicommodity flow problem and the research problem of multi train sizes scheme for urban rail transit co-line operation,explain the reason why this thesis adopts the multicommodity flow method.Establish a multi train sizes service network of urban rail transit under the description of the passenger’s travel choice.The passenger’s travel choice behavior on different intersections can be transformed into a network graph problem,and the edges and nodes in the network are analyzed in this network,the types of passenger flow are divided and defined,and the travel process of passengers is regarded as an arc in the network,the weight of the arc is the time of the travel process,and the travel path formed by the arc and node connection is used to describe the travel path of passengers.Travel behavior,and then construct the service network diagram of passenger flow distribution of Y-shaped co-line lines of urban rail transit.3.According to the Y-shaped co-liner operation route given in Chapter 2,the urban rail transit co-line operation multi train sizes scheme is constructed.Taking the minimum variable and fixed costs of enterprises and the minimum travel cost of passengers as the objective function,the optimal strategy model improved under the multicommodity flow method is used to describe the travel choice behavior of passengers.Then,based on the constraints of passenger flow demand,turnaround capacity,and logarithm of trains,the multi train sizes operation scheme of urban rail transit co-line operation line is solved,and the multi train sizes operation scheme of urban rail transit co-line operation is established.Finally,the model is linearized and the solution algorithm is given.4.Taking the rail transit line of a certain city as an example to verify the object,compare and select various train sizes schemes with the original scheme,and analyze the applicability of the multi train sizes scheme;Solve the model to get the optimal plan of the bank.The variable and fixed costs of enterprises and the travel costs of passengers are reduced,and the objective function value of the optimization scheme is 154470.66,which is 14.15% lower than the original target value.The transportation cost of the enterprise decreased by 0.26%,the waiting time of passengers increased with the reduction of the multi-group departure interval,and the waiting time cost of passengers decreased by 16.23%.The optimization result of the model verifies the feasibility of the multi train sizes operation scheme. |
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