幾類時滯復(fù)雜振子網(wǎng)絡(luò)的動力學與控制
[Abstract]:Complex networks exist widely in nature and human society, such as the Internet, transportation networks, power networks, protein-protein interaction networks, interpersonal networks, etc. It can be said that any complex system composed of the same or different individuals, when we abstract these individuals as nodes, the interaction between individuals as edges, we can use complexity. In recent years, research on complex networks has been carried out in many fields, such as mathematics, physics, computer science, mechanics, life science and information science, and has made remarkable achievements. The dynamics and control of complex networks have been extensively and deeply studied by many researchers in the academia. The results show that most of the complex dynamic behaviors of complex networks are accompanied by the changes of topological structure and dynamic properties of nodes. In general, complex networks with time-delay and nonlinearity usually exhibit special behaviors such as stability, instability, synchronization, oscillation, bifurcation and chaos. The study of these dynamic behaviors provides a very important theoretical basis and basis for the practical application of complex networks in various fields. Characteristic equation is a transcendental equation containing exponential function, which can not accurately solve its infinite number of characteristic roots. It brings a certain degree of difficulty to the analysis of network dynamics. To study the dynamic behavior of complex networks is to understand how the topological structure of the network affects the dynamic behavior of the network; to understand how the dynamic behavior of the network determines the topological structure of the network; and to adopt appropriate control strategies to control the network to achieve the desired dynamic behavior. The main contents and innovations of this paper are as follows: (1) The dynamic behavior of a class of small-world oscillator networks with time-delay and excitation or suppression of long connections is studied. According to the perturbation theory of matrices, the network connections are given respectively. The upper and lower bounds of the maximum and minimum eigenvalues of the strength matrix are given. Based on the stability theory of time-delay systems, the distribution of eigenvalues of the eigenvalues of the eigenvalues of the systems is investigated, the stability and instability of the networks are studied, and the regions of complete stability and complete instability of the networks are given. The stability criterion given in this paper is compared with the stability criterion given in the mean field theory. Although the stability criterion given in this paper is conservative, it can ensure the stability of the system in most cases, especially under the condition that both excitation and restraint connections exist simultaneously. Finally, the order and direction of the eigenvalues of the connection strength matrix leaving the stability region are discussed by numerical simulation. (2) The pinning control of a class of complex oscillator networks with time delay is studied. By analyzing the characteristic equations of the transformed system, it is found that the equilibrium point of the studied system is unstable for any time delay. To stabilize the unstable network system, an effective control strategy with time-delay state feedback, i.e. pinned control, is proposed. By analyzing the controlled network system and using the inverse transformation of orthogonal transformation, the local stability of equilibrium point, the existence conditions of Hopf bifurcation and codimension 2 bifurcation are given. The direction of Hopf bifurcation and the stability of bifurcation periodic solution are studied by using the central manifold theorem and the normal form theory. The path to chaos is investigated by numerical simulation. (3) The stability and complex space-time dynamics of a class of two-layer coupled complex oscillator networks with time-delay are studied. Firstly, the relationship between the eigenvalues of the adjacency matrix of the two-layer network and each single-layer network is analyzed by using the divide-and-conquer algorithm, and then the equilibrium of the system is given. It is found that the stability of a two-layer network can be determined by the maximum and minimum eigenvalues of the single-layer network matrix, so the dynamic behavior of the whole network can be understood only by studying the single-layer network. The periodicity of the system is analyzed by using the central manifold theorem. It is shown that the interaction between two-layer oscillators can produce complex spatio-temporal dynamic behaviors, such as reflected waves, mirror waves, etc. Finally, the results of theoretical analysis are verified by numerical simulation. (4) A class of small-world oscillator networks with stochastic long connection strength is studied. Stability and instability. By using random matrix theory and matrix perturbation theory, the probability distribution of the maximum eigenvalue and the lower bound of the minimum eigenvalue of the network connection strength matrix are analyzed. For a given system parameter, the probabilistic formula for calculating the stability of the system is given. The effects of the mean and variance of the long connection probability and the stochastic long connection strength on the stability of the network are discussed.
【學位授予單位】:吉林大學
【學位級別】:博士
【學位授予年份】:2017
【分類號】:O157.5
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