| As a convenient and comfortable mode of transportation,urban rail transit plays an important role in people’s daily life,and improves the timeliness and safety of residents’ travel.However,as the country vigorously develops three-dimensional transportation and continues to promote the integration of four networks,the complex spatiotemporal distribution characteristics of urban rail transit passenger flow have intensified,making it difficult for the traditional fixed formation operation mode to adapt to the complex passenger flow requirements by adjusting the departure interval and changing the number of train formations.On the basis of matching passenger flow demand with train capacity,the operation mode of reconnection marshalling trains can also save vehicle bottom applications and improve enterprise operation efficiency.Therefore,it is of great significance to study the operation scheme of urban rail reconnection marshalling trains considering large and small routing.The main research contents of this article are as follows:(1)The influence of passenger flow characteristics,driving conditions,and capacity resources on the reconnection marshalling trains operation scheme of urban rail is analyzed.The characteristics,advantages and disadvantages of train routing schemes,marshalling schemes,and stop schemes for urban rail transit are introduced,and the applicable conditions of different schemes are given.Then,the methods for determining the number of train operation pairs under different routing modes are analyzed,and the optimization principles for train operation schemes are summarized.In addition,it summarizes the transportation organization mode of reconnection marshalling trains,analyzes the advantages and disadvantages of the split mode of reconnection marshalling trains.Finally,the key technical issues restricting reconnection marshalling trains are analyzed,which provides technical support for the study of urban rail reconnection marshalling trains operation schemes considering large and small routing in this paper.(2)Taking the minimum passenger travel cost,enterprise operating cost and the maximum matching degree between passenger flow demand and line transport capacity as the objective function,and taking the departure frequency and the number of train marshaling of reconnection marshaling trains as the decision variables,the constraints of reconnection marshalling train operation scheme are considered comprehensively,an optimization model of urban rail reconnection marshaling train operation scheme is established considering big and small routing,and according to the characteristics of the model,non-dominated sorting genetic algorithm(NSGA-Ⅱ)with elite strategy is designed to solve the model.(3)Taking the large and small routing of a certain urban rail transit as the research object,based on the passenger flow data of the line at different times of the day,using the established model and the designed algorithm,the operation plan of the reconnection marshalling train on the line under the all-day condition is obtained.Comparative analysis of train operation schemes under different marshalling operation modes shows that compared to the 4-4-8reconnection marshalling train operation scheme,the passenger travel cost is reduced by11.36%,the enterprise operation cost is reduced by 17.15%,the prospect value of matching passenger flow demand with train capacity increased by 319.31% of the 3-3-6 reconnection marshalling train operation scheme.In addition,compared to train operation scheme of the fixed marshalling mode,the passenger travel cost is reduced by 24.66%,the enterprise operating cost is reduced by 10.38%,the prospect value of matching passenger flow demand with train capacity is increased by 35.20% of 3-3-6 reconnection marshalling train operation scheme.Finally,sensitivity analysis of key parameters of the model is conducted to reveal the impact mechanism of decision-makers’ psychological perception on the operation plan of reconnection marshalling train. |
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