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1.
The new chaos control method presented in this paper is useful for taking advantage of chaos. Based on sliding mode control
theory, this paper provides a switching manifold controlling strategy of chaotic system, and also gives a kind of adaptive
parameters estimated method to estimate the unknown systems' parameters by which chaotic dynamical system can be synchronized.
Taking the Lorenz system as example, and with the help of this controlling strategy, we can synchronize chaotic systems with
unknown parameters and different initial conditions.
Project supported by Doctoral Subject Research Fund of Ministry of Education of China (1999033512) and Science and Technology
Plan Fund of Zhejiang Province (991110412) 相似文献
2.
研究了一个新自治混沌系统的控制问题.当该混沌系统的参数未知时,基于Lyapunov稳定性理论,利用自适应控制策略,设计了相应的非线性控制器和参数自适应律将混沌系统的轨道控制到其任意一个平衡点,并借助Barbalat引理,从理论上证明保证了混沌控制的渐近稳定性.Matlab数值仿真结果表明了所选择的控制器和参数自适应律能有效地实现混沌控制. 相似文献
3.
This paper presents an adaptive strategy for controlling chaotic systems. By employing the phase space reconstruction technique in nonlinear dynamical systems theory, the proposed strategy transforms the nonlinear system into canonical form, and employs a nonlinear observer to estimate the uncertainties and disturbances of the nonlinear system, and then establishes a state-error-like feedback law. The developed control scheme allows chaos control in spite of modeling errors and parametric variations. The effectiveness of the proposed approach has been demonstrated through its applications to two well-known chaotic systems: Duffing oscillator and Rössler chaos. 相似文献
4.
A new chaos control method is proposed to take advantage of chaos or avoid it. The hybrid Internal Model Control and Proportional Control learning scheme are introduced. In order to gain the desired robust performance and ensure the system's stability, Adaptive Momentum Algorithms are also developed. Through properly designing the neural network plant model and neural network controller, the chaotic dynamical systems are controlled while the parameters of the BP neural network are modified. Taking the Lorenz chaotic system as example, the results show that chaotic dynamical systems can be stabilized at the desired orbits by this control strategy. 相似文献
5.
INTRODUCTIONOneoftheoldestresearchesofchaosincon trolfieldscanbeseeninthepaperbyKalman(1956) ,whofirstfoundnon synchronousoscil lationsinatwo dimensionalsampled datacontrolsystem .IntheOGYmethoddevelopedbyOttetal.(1990 ) ,chaoticphenomenawaseliminatedbyadjustingparametersofthesystemswhenthechaoticorbitcomesnearaperiodicalorbit.ButtheOGY’smethodrequiresmonitoringthesys temlongenoughtodeterminealinearizationmodeintheneighborhoodofthedesiredunstableperiodicorbitbeforeitcanbeapplied .Besi… 相似文献
6.
本文讨论了一类连续混沌系统的自适应同步控制问题，当被控系统含有未知参数时，采用Lya-punov函数方法，设计了一类控制器，对未知参数采用自适应调节，在该控制器的作用下，被控系统的输出自适应同步于具有混沌特征的驱动系统的输出。 相似文献
7.
A passive control strategy with nonlinear observer is proposed, which can be used to control a class of chaotic dynamical systems to stabilize at different equilibrium points. If the nonlinear function of chaotic system satisfies Lipschitz condition, the nonlinear observer can observe the state variables of the chaotic systems. An important property of passive system is studied to control chaotic systems, that is passive system can be asymptotically stabilized by state feedback controller whose state variables are presented by nonlinear observer. Simulation results indicated that the proposed chaos control method is very effective in a class of chaotic systems. 相似文献
8.
基于Matlab研究了离散混沌系统的数值解法和图形仿真，同时针对离散时滞混沌系统给出了数值仿真的Matlab程序．对于高阶离散混沌系统也可以采用上面的变换将系统降阶，变成一阶差分方程组进行求解，从而离散混沌系统都可以通过简单的编程实现数值仿真．从数值仿真角度来说，所得方法对于离散混沌系统的混沌同步和控制器仿真及误差描述都有积极的意义． 相似文献
9.
10.
本文以prenz混沌系统为例,提出了一种基于MATLAB平台的仿真软件Simulink建立混沌系统可视化模型的方法,分析了Lorenz系统的混沌特性,并对Lorenz系统的混沌同步与控制进行了仿真研究。该方法的优点是不需要用传统的程序代码对模型和算法进行编程,而且可以实现混沌系统建模及仿真分析的全程可视化,是研究混沌系统的一种简便、有效的新方法。 相似文献
11.
文章针对随机混沌系统辨识引入贝叶斯正则化方法的BPNN模型,使神经网络具有自适应性和推广能力;并交替使用贝叶斯正则化算法和混沌退火算法对网络参数进行优化,使系统具有最佳参数．以Logistic系统为例进行仿真分析,结果表明辨识模型不仅能够拟合原混沌系统,而且训练后的网络对含噪声的随机混沌系统有很好的辨识能力,精度良好．为下一步的设计控制器对混沌系统进行控制消除混沌,奠定了良好的基础． 相似文献
12.
贾卫红 《郧阳师范高等专科学校学报》2009,29(6):41-43
讨论了一个新的单参数混沌系统的反馈同步问题,基于Lvapunov稳定性理论,当系统参数已知和未知时,分别给出了多个简便且容易实现的控制器,另外,当控制参数值增加时,比较了同步的速度．最后仿真结果表明了该方法的有效性． 相似文献
13.
If the measuring signals were input to the chaotic dynamic system as initial parameters, the system outputs might be in steady
state, periodic state or chaos state. If the chaotic dynamic system outputs controlled in the periodic states, the periodic
numbers would be changed most with the signals. Our novel method is to add chaotic dynamic vibration to the measurement or
sensor system. The sensor sensitivity and precision of a measurement system would be improved with this method. Chaotic dynamics
measurement algorithms are given and their sensitivity to parameters are analyzed in this paper. The effects of noises on
the system are discussed.
Project support by the National Natural Science Foundation of China (No. 59805017) and the 863 High-Technology Project of
China (No. 863-512-9805-08). 相似文献
14.
王艳群 《衡阳师范学院学报》2007,28(3):33-35
研究了Duffing振子的混沌动力学。应用直接微扰法,我们构造了一级方程的通解,理论分析显示该通解的有界性条件包含着Melnikov混沌判据。当系统不满足微扰条件时,数值模拟表明随着外驱动力幅值增大,系统经历了一个倍周期分叉到混沌的过程。我们还发现,调节相关参数,可以有效的抑制系统的混沌。 相似文献
15.
利用自适应控制的方法，给出了一个新混沌系统的同步控制器和参数自适应律，使两个恒等系统达到了自适应同步同时识别未知参数．该控制器设计简单，易于实现，数值仿真表明所提方法具有效性． 相似文献
16.
提出了一个新单参数混沌系统,参数在一定范围变化时,能产生多个涡卷混沌吸引子．基于Lvapunov稳定性理论,通过设计控制策略实现了对混沌系统的有效控制,最后仿真结果表明了该方法的有效性． 相似文献
17.
提出两个修改的统一混沌系统,分析了它们的动力学特征;基于投影同步方法,提出了投影错位同步方法,并在两个修改的统一混沌系统之间实现了投影错位同步;同时也讨论了投影错位反同步问题．讨论结果表明了修改的统一混沌系统仍然保持基本的非线性性质,并且比原系统在同步中更容易实现．数值仿真表明了投影错位同步方法的有效性． 相似文献
18.
以Rossler混沌系统为例,运用Matlab对混沌系统及其延迟反馈控制系统进行建模和动态仿真,分析了其动态仿真在混沌控制中的应用,体现了Matlab在应用于仿真模拟混沌系统方面的方便性、直观性等优点． 相似文献
19.
根据一类混沌系统的结构和Lyapunov稳定性理论，讨论一类混沌系统在有参数和外部扰动情况下的同步问题．在驱动系统参数已知和未知两种不同的情况下，分别设计了适当的控制器以及参数自适应律实现了一类混沌系统的同步．以Arneod。系统为例进行了数值仿真，结果表明这些控制器及参数自适应律是有效的和可行的． 相似文献
20.
颜森林 《南京晓庄学院学报》2007,23(6):121-124
设想把混沌理论应用到电子对抗中,提出混沌信号干扰攻击敌方通信系统思想方法,提出混沌屏蔽攻击方法.混沌屏蔽攻击的物理机制是:强混沌信号可以直接屏蔽信息信号,小混沌信号可以扰乱信息信号.还发现联合混沌信号和噪声信号其攻击效果确能增加了通信系统的解调难度. 相似文献