Analysis And Research Of Tianjin Public Transport Network

In recent years,the Complex Network Theory provides a very important researching tool for the development of urban traffic network.How to improve the transit network become more perfect and reasonable,how to ease the traffic pressure are the top priority we have to face to.According to the data of the urban bus lines of Tianjin in October 2014 and the subway lines of Tianjin in August 2015,this paper establishes two space L models and analyses the characteristics of these networks being under attack.This paper is divided into the following several parts:In the first part,the important position of the bus system and subway system,and the great challenge they have faced are introduced.The development and the present situation are mentioned,also is the process of the development of the transit network both here and abroad.In the second part,the basic models of complex network are introduced and so are the parameters of the network,which are Degree,Degree Distribution,Average Path Length,Average Clustering Coefficient,Betweenness,the Largest connected sub graph and Efficiency.Three kinds of modeling methods of transit network are listed in turn.In the third part,a space L model of bus system based on Complex network theory is established.The parameters of the network are calculated.Using random attack mode and attempted attack mode to destroy the model.Draw the changing graphs of an Average Degree,Average Path Length and Average Clustering Coefficient being under attack.Given the graphs have mutation phenomenon which can't describe the network exactly,improve the model by establishing a second one,and discuss the invulnerability of the model.In the fourth part,a space L model of subway system based on complex network theory is established.The topological parameters are calculated.Using random attack mode and attempted attack mode to destroy the model.Draw the largest connected sub graph and network efficiency graph under different kinds of attack mode.Compare and analyze the degrees of damage by the two attack mode and finally make the conclusion.