Research On Evaluation And Optimization For Train Connection In Urban Rail Transit Networks

With the rapid development of China's urban rail transit,urban rail transit presents a networked form with multiple lines dispatching.The situation of networked nowadays indicates the stronger relationship between different lines.So,the single-line dispatched and operation scheme can't satisfy the new requirements of the network coordinated management,which affects the service of the urban rail transit.Based on the characteristics of the urban rail transit network,this paper analyzed the Shenzhen metro network,and built an evaluation and optimization model for train connection in urban rail transit network.Moreover,this paper designed an algorithm based on the characteristics of optimization model.This paper evaluated and optimized the train connection of Shenzhen metro network.Details are given as follows.Firstly,this paper analyzed the characteristics of the rail transit network to evaluate and optimize the connection of urban rail transit network's scientifically and objectively.The complex network theory is applied to analyze the static structure of Shenzhen urban rail transit network.At the same time,the dynamic characteristics of Shenzhen urban rail transit network based on the passenger flow data is also studied.Because of the large difference in spatial and temporal distribution,some stations carried a high proportion of passenger flow.This article defined such stations as the importance stations in the network,and took the importance stations into first consideration in the evaluation and optimization research.Secondly,the research on train connection is carried out based on the analysis of rail transit network characteristics.We established an evaluation system for the network trains connection by following three aspects.Take Shenzhen urban rail transit network as an example,according to it's characteristics,used fuzzy analytic hierarchy process to evaluate the train connection level of the network.After evaluation,it is found that the train connection level of Shenzhen urban rail transit network does not perform good.‘Transfer time' in ‘Transfer efficiency' are the key aspects to restrict the improvement of the train connection level.Finally,this paper optimized the key stations for weak ‘Transfer time'.This paper analyzed the transfer process of passengers in the transfer station.In order to reduce the waiting time of transfer,we established the optimization model of train connection in urban rail transit network.Take Shenzhen metro network as an example to conduct the model verification and calculation.Result showed that the optimization model and algorithm proposed in this paper have good applicability to Shenzhen urban rail transit network.The optimization schemed can be given in a short time,reduced the waiting time of network,improved transfer efficiency.It is of great guiding significance to improve the train connection of urban rail transit network.This dissertation includes 30 figures,21 tables,and 69 references.