| At present,the subway can be said to be the most green and environmentally friendly transportation mode,which can bring you more convenient and fast and comfortable travel experience.With the increase of subway lines in major cities,the number of people traveling by subway is gradually increasing,so as to avoid polluting the environment and avoiding the waste of time caused by traffic jams and the like.How to improve the rail transit network to make it more reasonable,complex network theory and method provides an extremely important basis for the study of urban rail transit network.Due to the increase in passenger traffic,site protection is our top priority.The main contents of this paper are:The first part introduces the important position of urban rail transit in people’s daily life,and describes the basic concepts and research status of complex networks and the research status of complex network invulnerability.In the second part,by defining the invulnerability of urban rail transit network,according to the line data of Tianjin Metro,an explanatory structure model is established to select the factors affecting the stability of Tianjin subway,so that the complex relationship between influencing factors becomes more organized..The third part calculates the parameters of the Tianjin rail transit network,including the degree and degree distribution,the median,the point strength,the average path length and the shortest path distance.Using the complex network theory,the Space L method is used to construct a weighted network with distance weighting.Using the tools of Gephi and other tools,the Tianjin rail transit network model was constructed and the characteristics of the rail transit network were analyzed.The fourth part uses programming software to perform random attacks,initial node degree(ID)attacks,recalculation node degree(RD)attacks,initial node-intermediate(IB)attacks and recalculation nodes for the Tianjin rail transit network model.The intrusive simulation experiment of five kinds of deletion node operations of the number(RB)attack,and the network efficiency as the evaluation index of the invulnerability.Through simulation experiments,the damage degree of the five attacks on the network is compared and analyzed,and the invulnerability of the overall network under differentattack strategies and the importance of each node in the network are established.In the fifth part,through the analysis of simulation experiments,it provides a reference for the daily protection and network structure optimization of Tianjin rail transit network. |
