Analysis And Simulation Research On Invulnerability Of Urban Rail Transit Network

ABSTRACT:With rapid social and economic development, its urbanization process is accelerating. Line scale of urban rail transit in Beijing, Shanghai and Guangzhou and other large cities is gradually expanding, and a new phase of network operation of urban rail transit has been forming. Although it can provide fast, convenient and efficient services, etc., the frequent occurrence of accidents caused loss of life and property of passengers and extremely bad social impact. Urban rail transit network is a typical complex network, mainly because of an accident on the complexity of urban rail transit network is not enough in-depth understanding, there is no complex network of urban rail transit do a comprehensive sustainability planning.The main research works of this paper are as follows:Firstly, after invulnerability of urban rail transit system is defined and influential factors that may have impacts on invulnerability of the system analyzed, an interpretation structure model refers to invulnerability influential factors of urban rail transit system is built to discern the hierarchical relationship of these influential factors, and the most direct and fundamental factors are determined, namely topology and passenger volume of urban rail transit. Secondly, based on the most direct and fundamental influential factors, physical network model and functional network model of urban rail transit system are built. In order to implement the research in a practical scale, physical model and functional model of Beijing urban rail transit are built. Besides, based on complex network theory, characteristic parameters of the two models are analyzed. Then, invulnerability simulation model of urban rail transit is built. In the simulation model, five strategies for attack node is adopted, efficiency and loss function are respectively chose as invulnerability evaluation indexes. Finally, with the help of the Matlab software, not only the process of being attacked of Beijing urban rail transit under five strategies is simulated, but also the individual attack on every single node is simulated. Through the simulation experiment, the invulnerability state of overall network under five strategies and the weight of every single node can be determined.Research on influential factors of invulnerability of urban rail system in this paper has a significant effect on prevention and monitoring of potential incidents in urban rail system. Base on complex network theory, the research on invulnerability in this paper has positive effects in various aspects. The research could contribute to a precise identification of important stations in the system and understanding of invulnerability from large scale. And utility of emergency sequences could be enhanced by the research on invulnerability. Thus, we could have better options on construction of future urban rail, and a better system with higher quality of service.