Research Of Cascading Failure Based On Double Layer Network

With the continuous development of science and technology,more and more ecosystems have appeared around us.Such as transportation network,communication network,Internet and so on.These ecosystems are constantly expanding,it has a huge impact on our lives,they make up a big network together,which is what we call complex networks.Complex networks are all interconnected and functional in today's life.Once successive failures occur,the effect of their interaction will have an incalculable effect on production and life.So we need to do an analysis of the dependency network,study the constitution mechanism of the network,and conduct a comprehensive study on the mechanism of successive failures.Construct the corresponding theoretical model from the static and dynamic angle.This paper starts from the topological structure of the two-layer network model,and studies the effect of the two-layer network node characteristics and coupling mode on the double-layer failure.This paper constructs and optimizes the two-layer network successively fault model,and studies their protection strategy and so on.The main contents are as follows:Firstly,according to the node characteristics of the double-layer network,the paper analyzes the degree and clustering coefficient,weights the node's importance,and adopts the one-to-one coupling method.According to the size of the weight,the importance of the node is analyzed.Through interlayer connections and interlayer connections,the maximum connectivity of successive failure is analyzed,the optimized network structure is constructed,and the simulation verification is carried out to provide theoretical basis for the subsequent research.Secondly,according to load-capacity model,the paper defines the initial load of network nodes and selects the degree and the number of parameters to define the size of the initial load of the node to get the load change of the node.At the same time,analyzes the double-layer network fault with load and obtains the flow chart of successive fault simulation.The paper adopts targeted attacks and the influence of load changes in different subnet models and different connection modes are studied in detail.Through experimental simulation,the advantages of this method are verified,and the robustness of the double-layer network is improved.Last,this paper analyzes the mechanism principle of successive failure,studies its attack strategy,local protection strategy and overall protection strategy.This paper proposes a strategy to improve network robustness by means of matching connection,selecting similarity network structure and increasing network average degree.At the same time,according to the analysis of the parameters of topological structure,the calculation method of node importance is reformulated.Based on node degree and betweenness weighted,this paper optimized the double network node important target protection strategy,through the comparative analysis of the simulation shows that the protection strategy helps to improve the double network's ability to fight successive failure.