Hierarchy Classification And Structure Optimization Of Urban Public Transit Line Based On Weighted Complex Network

The public transport of the city is the city's running aorta.The development of urban public transport is closely related to the city's economy and the lagging development of public transportation has seriously restricted the rapid development of the urban economy.With the rapid increase of urbanization and motor vehicles,traffic congestion has become increasingly prominent.In recent years,major cities have stepped up their efforts to improve urban traffic conditions both at home and abroad.In the case of limited traffic resources in China,planning and optimizing with the urban public transport network is the only way to maximize the utilization efficiency of existing resources and alleviate the urban road traffic tensions.The city public transport network is a typical,open and complex giant network.This paper studies the topology of public transport network from the perspective of complex network and aims to further plan and optimize the urban public transportation network.In this paper,several major public transport network models are compared on the urban public transport network weighted topology modeling,and the weighted dual method(line space method)is constructed to build the network model.Considering the characteristics of the bus network,the traffic is loaded into the network as the weight.Then,the spatial topological relation and the transfer system relationship between the track line and the conventional bus line are analyzed,and the reliability of the transfer chain connection network is put forward.In the completed public transport topology network,the weight of the nodes is determined first,and the weighted adjacency matrix is established by considering the interaction between the nodes and using the gravity model method to obtain the weight between the two nodes.By analyzing the center index of the network node,the node degree,the tightness and the size of the three kinds of nodes are established to determine the importance of the node.Then the principle of the classification of the different grades of the urban road is compared,and the principle of the classification of the bus network is determined.Fuzzy clustering method is used to obtain the clustering threshold,and the above-mentioned hierarchical structure of the theoretical is compared to determine its rationality.Then,based on the BBV model,considering the dynamic driving mechanism of the passenger flow and the interaction intensity between the old and the new nodes,a connection probability evolution model based on the node rank is proposed,and an optimization model based on the minimum and maximum transport efficiency is established.Finally,the Baoji City bus network is taken as an example of analysis.This paper chooses Baoji City Bus Network to analyze the object according to the principle of bus line grade division of the regular bus in Baoji City.The regular bus route is divided into three levels.The first level bus line is upgraded and three track lines is established.Based on the theory of urban public transport network structure optimization,the bus network of Baoji City is optimized.By using the traffic power driving mechanism and the node rank priority connection theory,the structure of the bus network is optimized,and three new lines are selected.At last,the optimal route is achieved with the optimized model.