Analysis And Simulation For Urban Public Transit Networks

In order to make a better planning, design and evaluation for the public transit systems, it is necessary to make more profound studies of the structure of urban transit networks. According to the ways of studying complex networks, the thesis presents an empirical analysis of 5 Chinese public transit networks, including analyzing their statistical parameters of topology structures under different extracting methods and their dynamics in the system operating simulation. The structures of these networks exhibit small-world characteristics and approximate to random graphs. However, they do not emerge to the scale-free property as other countries. Through the review about the practical interpretations of those statistical parameters, the author proposed some possible reasons to cause the structural differences between Chinese and other countries.This thesis consists of four parts:PART ONE: Including chapter 1 and 2, the author instructs the transport problems appeared in current Chinese cities and introduces the applications and backgrounds of complex networks research.PART TWO: In chapter 3, four different network extracting methords-- space of stations, space of stops, space of changes and space of lines-- are used to analyze the structures of public transit networks in Beijing, Shanghai, Tianjin, Chongqing and Wuhan respectively. The results show that Chinese urban public transit networks have different topological structure with forieign countries.PART THREE: The research for the relationship between structures and dynamics of public transit systems is presents in chapter 4. Though the simulation, the author present the high-degree-vertices in networks play important roles in system operating. On the basis of this hypothesis, a relevant impovement is offerd.PART FOUR: Finally, chapter 5 summarizes the whole thesis and provides some possible ways to explore the public transit system combining with the study of complex networks.