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混沌同步研究进展综述 总被引:3,自引:0,他引:3
王建根 《计算机工程与应用》2005,41(22):1-4
对近年来混沌同步研究的进展进行了简要综述,包括混沌同步的各种定义以及同步研究中对混沌系统的分类、混沌同步的研究路线与常用方法、以及混沌同步研究的各种结果等等。最后,指出了混沌同步研究现有文献中的一些值得注意的问题。 相似文献
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介绍了与混沌控制相关的基本概念,说明了混沌控制的不同策略,重点阐述了混沌与混沌控制在信息处理中的应用,并对今后的研究方向提出了一些见解。 相似文献
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自适应方法控制混沌超混沌系统同步的研究 总被引:2,自引:0,他引:2
本文采用面向在适应控制地四阶混沌、超混沌系统的同步控制回顾进行了研究。理论分析及计算机模拟表明:只有选择使系统可控的控制参数、同步控制才有可能实现,进行超混沌系统同步控制时,组合系统的条件Lyapunov指数大于零敢可以实现同步控制。 相似文献
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Chaos control and synchronization via a novel chatter free sliding mode control strategy 总被引:2,自引:0,他引:2
Huaqing LiAuthor Vitae Xiaofeng LiaoAuthor VitaeChuandong LiAuthor Vitae Chaojie LiAuthor Vitae 《Neurocomputing》2011,74(17):3212-3222
In this paper, we propose a novel chatter free sliding mode control (SMC) strategy for chaos control and synchronization to the nonlinear uncertain chaotic systems. A new sort of dynamical sliding mode surface with both integral and differential operators is introduced to divert the discontinuous sign function switch term into the first derivative of the control input; hence a chatter free control input is obtained for the chaotic systems with uncertainties. Based on the Lyapunov stability theory and SMC technique, stability analysis is performed and a theorem serving as designing the chatter free sliding mode control input is also proposed. In the simulation part, first, the results regarding chaos control and synchronization are given to show that the proposed strategy can control the states of the uncertain chaotic systems to desired states with fast speed. In order to show the advantage of eliminating chatter in control input of our method, we give the simulation results performed by traditional SMC and the method proposed recently. Simulation results indicate that this novel chatter free sliding mode control strategy is very effective to chaos control and synchronization. 相似文献
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Since chaotic systems are important nonlinear deterministic systems that display complex, noisy-like and unpredictable behavior, synchronizing chaotic systems has become an important issue in the engineering community. Due to the proportional-integral-derivative (PID) controller has a simple architecture and easily designed, it was widely used in the industrial applications. However, the traditional PID controller usually needs some manual retuning before being used to practically application. To tackle this problem, this paper proposes a self-learning PID control (SLPIDC) system which is composed of a PID controller and a fuzzy compensator. The PID controller which is used to online approximate an ideal controller is the main controller. The controller gain factors of the PID controller can automatically tune based on the gradient descent method. The fuzzy compensator is designed to dispel the approximation error between the ideal controller and PID controller upon the system stability in the Lyapunov sense. From the simulation results, it is verified that the chaotic behavior of two nonlinear identical chaotic gyros can be synchronized by the proposed SLPIDC scheme without the chattering phenomena in the control effort after the controller parameters learning. 相似文献
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The problems on chaos control and hybrid projective synchronization for a class of new chaotic systems are considered. First, new 4D chaotic systems are proposed by introducing an additional state into a 3D quadratic chaotic system and the states of the systems corresponding to the different ranges of parameter b are exhibited. Second, a single scalar adaptive feedback controller for chaos control of the systems is presented. Third, hybrid projective synchronization (HPS) of two of the chaotic systems with parameters in different conditions are investigated by presenting adaptive feedback control strategies with adaptive parameter update laws and considering controller simplification to achieve complete synchronization. Finally, numerical simulations are demonstrated to verify the effectiveness of the strategies. 相似文献
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基于变量反馈控制方法的混沌控制研究 总被引:1,自引:0,他引:1
将变量反馈控制(VFC)方法用于混沌杜芬方程的控制,通过调整反馈强度,可显著改善混沌现象,并可使系统由初始的混沌轨道被控变成非混沌的轨道,最终进入目标轨道。 相似文献
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Chaos control and associative memory of a time-delay globally coupled neural network using symmetric map 总被引:1,自引:0,他引:1
Tao WangAuthor Vitae Kejun WangAuthor VitaeNuo JiaAuthor Vitae 《Neurocomputing》2011,74(10):1673-1680
A chaotic neural network called time-delay globally coupled neural network using symmetric map (TDSG) is proposed for information processing applications. Firstly, its rich dynamic behaviors are exhibited and the output stability is demonstrated by using a parameter modulated control method. Secondly, the associative memory of TDSG is investigated by the control method. It is observed that the stable output sequence only contains stored pattern and its reverse pattern and the TDSG finally converges to the stored pattern which has the smallest Hamming distance to the initial patterns with noise. At last, strong information recovery ability of the TDSG is illustrated by comparative experiments. 相似文献
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基于混沌的图像的数字水印隐藏算法 总被引:9,自引:2,他引:9
数字水印技术是进行数字产品版权保护的一种手段。该文提出了一种基于混沌的图像的数字水印隐藏方法。该算法应用混沌系统生成的混沌序列,改变水印的嵌入位置,使得嵌入位置具有随机性,同时综合考虑嵌入水印后的视觉效果,使得像素的改变不会影响图像的不可见性。该方法特征:水印的不可见性好;水印的嵌入和提取过程中需个人的密钥,由于混沌的混沌特性,因此不知该密钥的用户无法正确恢复水印;水印的提取不需要原始图像。计算机仿真结果令人满意。 相似文献