| With the development of the city,people’s requirements for travel convenience and less time cost are also getting higher and higher.Urban rail transit has received more and more attention as an economically viable public transportation mode.The safety and vulnerability of urban rail transit system also need to be paid more attention.The vulnerability of urban rail transit system,the anti-destroying ability of network and its optimization is studied in this paper.Firstly,the basic theory of complex network and its research extension in the field of transportation is introduced.After defining the vulnerability of urban rail transit,the research on urban rail transit vulnerability is divided into two parts: vulnerability influencing factors and anti-destroying ability of the network.Secondly,based on the statistical analysis of urban rail transit accident cases,literature reading and expert interviews,the influencing factors of urban rail transit vulnerability are extracted,and the correlations and hierarchical relationship between the influencing factors are analyzed with the method of interpretative structural modeling.Then,the transportation network is constructed in Space L method.And the anti-destroying ability of the rail transit network is analyzed based on the network average,diameter,maximum connected subgraph and global efficiency.Next,based on improved PSO algorithm,an optimization model of the antidestroying ability of urban rail transit network is established.And the objective function,constraint function and scheme selection of the model are described in detail.Finally,based on the example of urban rail transit in Wuhan,the simulation of anti-destroying ability of the network optimization is carried out.After observing the optimization results and the actual situation,the optimized edge-enhancing information is deleted and the optimization scheme is proposed.The results show that the anti-destroying ability of urban rail transit network in Wuhan can be optimized by improving advanced PSO algorithm.The correlation and hierarchy relationship of the influencing factors of urban rail transit vulnerability are sorted out,which is helpful for managers to understand the mechanism of each impact factor.And the establishment of the anti-destroying ability optimization model of the network provides a reference for the development of urban rail transit network planning. |
