Cascading Failure of Urban Weighted Public Transit Network under Single Station Happening Emergency

Abstract

In order to construct weighted public transit network, this work introduces bus routes density and departure frequency relative value to modify the traditional space L method. Then, the station initial load and capacity are defined based on station intensity, and the cascading failure model of weighted public transit network under single station deliberate attacks is given. Finally, Jinan city's weighted public transit network is taken as sample to analyze the station intensity distribution, which can get that the intensity average value and variance of stations are both divergent, the network follows power-low distribution with exponent λ = 1.66 and has the characteristics of scale-free network; by case simulation experiment, we give the cascading failure simulation analysis under three kinds of station attack strategies, get the intensity value size of failure station, the station load tolerance parameter α and the station load distribution control parameter β having important influences on cascading survivability, and verify the feasibility of cascading failure model.