Study On Cascading Failure Model Of Complex Network With Nonlinear Load And Capacity

As an important branch of complexity science,complex network research has been widely concerned by researchers in various fields in recent years.Many of these cascading failures occur on many complex network systems that are very dependent on the society now.Such as logistics network,electric power network,informa t io n network,traffic network and so on.The study of the vulnerability of complex networks has an important practical significance,and it has become a very important and chal enging frontier topic.Especially,with the rapid development of information and network technology,the dependence of modern society on all kinds of network systems is deepened.The emergence of a series of serious problems such as network security and stability needs to be studied and solved.On the premise of absorbing the research results at home and abroad,this paper mainly summarizes the previous work,and from the perspective of improving the robustness of the network,we have mainly completed the following aspects:1.Aiming at the problem of cascading failures on complex networks,considering the dynamic process of the flow around the generation and propagation and cascading failures are closely related,the cascading failures model are analyzed model deeply.We study the dynamic characteristics of cascading failures,and provide a basis for developing reasonable and effective protection strategies for networks by measuring the robustness index of network against cascading failures.2.In this paper,the cascaded propagation characteristics under the deliberate attack and random attack in scale-free networks and random networks are studied,and a more realistic model is established.In this paper,a nonlinear load capacity model is proposed,which is more in line with the real network.Under the condition of maintaining the total capacity,the robustness of the network can be improved by enhancing the capacity of the neighbor nodes of important nodes.3.In the simulation experiment,first,based on the nearest neighbor load reassignment strategy,the simulation results of the proposed model are compared with other models on the two networks of scale-free network and random network,respectively,and the results are compared and verified.The feasibility and effective ness of the model are verified by simulation experiments.Then,based on the global al ocation strategy,we compare the simulation results with the other models on the two networks of scale-free network and random network respectively,and verify the feasibility and effectiveness of the model through simulation experiments.