共查询到18条相似文献,搜索用时 109 毫秒
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单参数统一混沌系统的自适应控制同步 总被引:3,自引:0,他引:3
研究了单参数统一混沌系统的同步问题,提出了参数自适应控制同步方法;通过构造适当的控制函数和设计参数的自适应控制律,实现了两个不同参数的统一混沌系统的同步;根据Lyapunov稳定性定理,导出了两不同参数混沌系统能实现同步的充分条件,无论驱动系统处于何种状态,该方法都可使响应系统按照驱动系统给定的轨道演化。数值仿真表明了该方法的有效性。 相似文献
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将滑模控制策略用于时延混沌系统的同步,采用了对系统参数摄动鲁棒性好的变结构控制,使系统对噪声和参数失配情况具有更强的鲁棒性。同时将自适应技术、系统辨识技术应用于系统中的未知参数逐步逼近,实现具有扰动以及参数未知的时延混沌系统的同步。仿真结果证实了该方法的有效性。 相似文献
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考虑参数不确定的多维时滞混沌系统作为驱动系统(发射系统),系统的未知参数能够在系统中线性表示.采用参数辨识与自适应技术,在响应系统(接收系统)中应用线性反馈与参数自适应控制,使得驱动系统与响应系统能够混沌同步,并且响应系统的参数逐步逼近驱动系统的参数.利用Lyapunov泛函与最大不变集原理(Lassel)给出了理论分析与证明.理论分析与数值模拟结果表明该自适应控制同步策略的有效性. 相似文献
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该文针对含未知参数的异结构超混沌复系统,基于自适应控制及Lyapunov稳定性理论,提出一种新的自适应广义组合复同步方法 (GCCS)。首先给出广义组合复同步的定义,将驱动-响应系统的同步问题转化为误差系统零解的稳定性问题;然后从理论上设计了非线性反馈同步控制器及参数辨识更新律,并引入误差反馈增益,以控制同步的收敛速度;最后以超混沌复Lorenz系统、超混沌复Chen系统、超混沌复L系统的广义组合复同步与参数估计为例,从数值仿真角度验证了所提方法的正确性和有效性。 相似文献
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基于混沌同步的参数识别 总被引:1,自引:1,他引:0
构造了一个响应系统,使之与参数未知的驱动系统结构相同,并用参数自适应控制法实现同步.在同步态,两系统的参数完全一致,控制器也自动消失,由此可以得到驱动系统的参数.以Rossler系统为例验证了该方案的可行性. 相似文献
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Department of Electronic Information Zhejiang Ocean University Zhoushan ChinaLIU Yu-liang ZHU Jie DING Da-wei Department of Electronic Engineering Shanghai Jiaotong University Shanghai China 《中国邮电高校学报(英文版)》2007,14(2):103-105
By the control method independent of system parameters, synchronization of two Chen chaotic systems with identical, but uncertain parameters is discussed in this article. Based on Lyapunov’s theorem, an adaptive controller and the parameters estimate update law are derived to make the solution of the error dynamical equation converge at the point E(0, 0, 0) with a quick speed, that is, the states of two Chen chaotic systems can be asymptotically synchronized. Numerical simulations verify the effectiveness and the adaptivity to the variation of Chen system parameters. 相似文献
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针对混沌动力学系统建模困难,控制不易实现,存在干扰等特点,在附加动量法的自适应BP网络的基础上,研究了混沌动力学系统的学习控制策略。构建了混沌动力学系统的NN模型和NN控制器,对混沌系统在学习的同时施加控制,仿真实验结果表明,该控制策略具有鲁棒性强,有良好的适应性,网络参数训练时间短等优点。 相似文献
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Bounds on the time-varying parameters that are sufficient to insure stability in linear time-varying systems are developed. The important and significant property of the stability criterion developed is that the bounds on the time-varying parameters can be established from the real-frequency characteristics of the time-invariant part of the system. Therefore, the stability criterion is applied easily in high-order systems. Techniques which permit the determination of decaying exponential bounds on the system signals are also presented. The application of the results obtained to parametric devices, satellite attitude control and adaptive systems is illustrated via examples. 相似文献
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Moosa Ayati 《Circuits, Systems, and Signal Processing》2012,31(3):911-926
This paper presents an adaptive fuzzy controller for Nonlinear in Parameters (NLP) chaotic systems with parametric uncertainties.
In the proposed controller, the unknown parameters are estimated by the novel Improved Speed Gradient (ISG) method, which
is a modification of Speed Gradient (SG) algorithm. ISG employs the Lagrangian of two suitable objective functionals for on-line
estimation of system parameters. The most significant advantage of ISG is that it is applicable to NLP systems and it results
in a faster rate of convergence for the estimated parameters than the SG method. Estimated parameters are used to design the
fuzzy controller and to calculate the Lyapunov exponents of the chaotic system adaptively. Furthermore, established on the
well-known Takagi–Sugeno (T-S) fuzzy model, a LMI (Linear Matrix Inequality)-based fuzzy controller is designed and is tuned
using estimated parameters and Lyapunov exponents. Throughout the controller design procedure, several important issues in
fuzzy control theory including relaxed stability analysis, control input performance specifications, and optimality are taken
into account. Combination of ISG parameter estimation method and T-S-based fuzzy controller yields an adaptive fuzzy controller
capable to suppress uncertainties in parameters and initial states of NLP chaotic systems. Finally, simulation results are
provided to show the effectiveness of the ISG and adaptive fuzzy controller on chaotic Lorenz system and Duffing oscillator. 相似文献
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针对一类特定结构的含有未知参数的混沌系统,给出了一种基于状态观测器的自适应同步控制方法。通过一个带有控制器的非线性状态观测器实现混沌系统的渐进同步并对未知参数进行估计。该控制方法简单易行,且能通过自适应律自动调整以跟随参数的变化,具有较强的鲁棒性。理论分析和仿真实验都证明了该方法的有效性。 相似文献