共查询到19条相似文献,搜索用时 51 毫秒
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提出了基于稳定性准则的半周期延迟-非线性反馈控制混沌的方法,即SC(stability criterion)半周期延迟非线性反馈控制法.通过对混沌系统的适当分离,得到一个特殊的非线性函数,并利用混沌输出信号与其半周期延迟信号的非线性函数之和,构造了连续反馈输入干扰.该方法继承了延迟反馈控制方法及稳定性准则控制方法的优点,实现了有效的自控制过程;并克服了延迟反馈方法的限制,能将嵌入混沌吸引子中的自对称直接不稳周期轨稳定.控制过程可随时开始,具有简便、灵活性.数值模拟结果显示了SC半周期延迟-非线性反馈方法控制的有效性.
关键词:
稳定性准则
混沌控制
半周期延迟
非线性反馈 相似文献
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基于数学上延迟(时滞)系统Hopf分支理论及分析方法,解析地确定出 用延迟反馈法可控制三阶自治混沌系统的一般条件.利用这种分析方法,着重从理论上 讨论了在控制意义下系统出现稳定周期解及由Hopf分支产生周期解的分支方向的判据.将这 些理论应用到三阶自治混沌系统的控制实例中,解析地得到使系统可控的参量区域.在该区 域内选择控制参量,通过数值模拟也得到控制系统从混沌到周期态的结果.
关键词:
延迟反馈
Hopf分支
控制混沌 相似文献
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在混沌有益时,有目的地产生混沌已经成为混沌学研究的热点问题,本文提出直接延迟反馈实现混沌的反控制,在非混沌系统中产生了混沌.该方法与间接延迟反馈控制方法相比,控制更加简单,更易于实现.该方法与Pyragas提出的延迟反馈混沌控制方法的控制器结构相同,因此,这种直接延迟反馈控制方法可以在需要混沌时产生混沌,不需要混沌时控制混沌,实现混沌控制和反控制的统一,为设计者提供最大的灵活性.针对参数处于非混沌区的Chen系统和Lorenz系统的仿真结果表明了该混沌反控制方法的有效性.
关键词:
混沌
反控制
直接延迟反馈 相似文献
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利用线性时间延迟自反馈方法,研究单个Hindmarsh-Rose(H-R)神经元模型混沌动力学模式的控制问题.分别将增益因子和时间延迟作为控制参数,通过数值模拟分析,发现在增益因子和时间延迟两个参数组合的一些范围内,混沌动力学模式的H-R神经元运动可自动被控制成时间间隔意义上的单峰、2峰、3峰及4峰的周期或多倍周期模式.延迟时间的选取并无特别要求,不必和嵌入在混沌吸引子内的某不稳周期轨道的周期相同,延迟控制自适应地引导混沌轨到相应的放电峰峰间隔的周期模式上.
关键词:
H-R神经元
延迟反馈控制
混沌放电模式
峰峰间隔周期 相似文献
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Control of chaos by a delayed continuous feedback is studied experimentally in a gas discharge plasma. The power spectrum, the maximum of Lyapunov exponents and the time series of the signals all indicate that the period-1 unstable periodic orbit is controlled successfully. The dependence of the control on the delay time and the feedback gain as well as the strength of white noise is also investigated in detail. The experimental results show that the scaling index of the control versus the strength of white noise is 1.995, which is very close to that obtained from the simple logistic map. 相似文献
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The resistively--capacitively--inductively-shunted (RCL-shunted)
Josephson junction (RCLSJJ) shows chaotic behaviour under some
parameter conditions. Here a scheme for controlling chaos in the
RCLSJJ is presented based on the linear feedback theory. Numerical
simulations show that this scheme can be effectively used to control
chaotic states in this junction into stable periodic states.
Moreover, the different stable period states with different period
numbers can be obtained by appropriately adjusting the feedback
intensity and delay time without any pre-knowledge of this system
required. 相似文献
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The resistively-capacitively-inductively-shunted (RCL-shunted) Josephson junction (RCLSJJ) shows chaotic behaviour under some parameter conditions. Here a scheme for controlling chaos in the RCLSJJ is presented based on the linear feedback theory. Numerical simulations show that this scheme can be effectively used to control chaotic states in this junction into stable periodic states. Moreover, the different stable period states with different period numbers can be obtained by appropriately adjusting the feedback intensity and delay time without any pre-knowledge of this system required. 相似文献
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Controlling and synchronizing spatiotemporal chaos of the coupled Bragg acousto-optical bistable map system using nonlinear feedback 总被引:3,自引:0,他引:3 下载免费PDF全文
In this paper we present the control and synchronization of a coupled Bragg acousto-optic bistable map system using nonlinear feedback technology. This nonlinear feedback technology is useful to control a temporally chaotic system as well as a spatiotemporally chaotic system. It can be extended to synchronize the spatiotemporal chaos. It can work in a wide range of the controlled and synchronized signals, so it can decrease the sensitivity down to a noise level. The synchronization can be obtained by the analysis of the largest conditional Lyapunov exponent spectrum, and easily implemented in practical systems just by adjusting the coupled strength without any pre-knowledge of the dynamic system required. 相似文献
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