共查询到19条相似文献,搜索用时 109 毫秒
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In this paper, we discuss global stabilization procedure for convergence of a more general feedforward nonlinear systems. Our stabilizer consists of a nested saturation function, which is a nonlinear combination of saturation functions. We extend the existing stabilization results and prove that our stabilizer is exponential convergent. 相似文献
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We propose a robust scheme to achieve the synchronization of chaotic systems with modeling mismatches and parametric variations. The proposed algorithm combines high-order sliding mode and feedback control. The sliding mode is used to estimate the synchronization error between the master and the slave as well as its time derivatives, while feedback control is used to drive the slave track the master. The stability of the proposed design is proved theoretically, and its performance is verified by some numerical simulations. Compared with some existing synchronization algorithms, the proposed algorithm shows faster convergence and stronger robustness to system uncertainties. 相似文献
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一个无线传感网络时间同步模拟器 总被引:2,自引:0,他引:2
Time synchronization is a critical middleware service of wireless sensor networks. Researchers have already proposed some time synchronization algorithms. However, due to the demands for various synchronization precision, existing time synchronization algorithms often need to be adapted. So it is necessary to evaluate these adapted algorithms before use. Software simulation is a valid and quick way to do it. In this paper, we present a time synchronization simulator, Simsync, for wireless sensor networks. We decompose the packet delay into 6 delay components and model them separately. The frequency of crystal oscillator is modeled as Gaussian. To testify its effectiveness, we simulate the reference broadcast synchronization algorithm (RBS) and the timing-sync synchronization algorithm (TPSN) on Simsync. Simulated results are also presented and analyzed. 相似文献
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针对实际中两Chua混沌系统同步可能遇到的问题,即不同混沌状态两相同结构的混沌系统以及不同结构的Chua系统之间的同步问题,提出了一种新的控制器。利用Lya-punov稳定性理论,对新控制器控制两系统同步误差的稳定性进行了分析和证明。最后,利用Matlab进行了大量的计算机数值仿真实验,研究了5涡与3涡,5涡与1涡,5涡与非混沌态及不同结构Chua系统之间的同步。数值仿真实验的结果证实了该控制器的有效性。 相似文献
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使用同步电路综合工具优化异步电路 总被引:1,自引:0,他引:1
现可用的同步电路综合工具对捆绑数据类异步电路直接映射的方法不能有效地约束时序,分模块综合的方法不能进行全局优化,其中以标准单元组成C单元降低了电路性能、增加了电路面积.通过将4相位捆绑数据寄存器流水线数据通道等效为一个同步流水线,可以自顶向下地进行有时序约束的综合,采用全定制C单元,并把其当作组合逻辑门进行分析,综合出的电路更加优化.使用此方法实现的一个数据流AES芯片的数据通道的面积延时积是直接映射方法的88%左右,实际芯片的整体性能优于一个由Balsa实现的AES芯片。 相似文献
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Some new results on global exponential synchronization and global synchronization for Chua's circuit are derived by means of Lyapunov functions and some other mathematic methods, which improve the existing results in the literatures. A strict and complete proof of the result is also given as a complement to the relevant literature where the proof was incomplete. The paper offers some new approaches for studying chaos synchronization for Chua's circuit. 相似文献
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研究了三个线形和环形耦合HR神经元网络模型的同步行为.通过构造合适的Lyapunov函数和LMI方法,获得线性化偏差系统零解的全局渐近稳定性和全局指数稳定性,给出实现同步的相关判据.进一步地,环形耦合网络比线形耦合网络更容易同步.数值结果显示了我们结果的有效性. 相似文献
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针对一个新的混沌系统,简单分析了其稳定性,并对其进行同步控制.在研究单变量驱动同步的基础上,应用自适应控制理论,研究了当系统参数不确定时的同步问题.根据Lyapunov稳定性理论,推导了当参数不确定时误差系统渐近稳定的充分条件,构造了合适的自适应控制规律快速辨识了系统参数.数值仿真结果表明方法是有效的和可行的,且自适应控制规律的设计简单可靠,并实现了两个混沌系统的状态同步.同时该方法可推广到情况类似的其他混沌系统. 相似文献
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利用混沌信号作为载体实现信息通讯,其关键问题是发射机系统与接收机系统的混沌同步。本文应用MATLAB(数值计算实验)对由两个三维混沌系统(Chua系统与Lorenz系统)构造的高维超混沌系统进行了动态模拟,实现了高维系统的混沌同步及其信息通讯的编码与解码过程。模拟结果表明,高维系统的同步可以通过各子系统的混沌同步逐级实现,而初级子系统的同步程度、抗干扰性以及稳定性决定了高维系统的同步能力,模拟过程可以对此进行有效的数值分析,为应用研究的技术实现提供了依据。 相似文献
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该文采用研究混沌连续时间系统的同步方法,基于系统的稳定性准则,分析了蔡氏电路的混沌同步问题,即用同步误差的线性系统的稳定性分析来保证混沌的同步。通过系统的线性项和非线性项的适当分离,使系统的雅可比矩阵的全部特征值为负值,此时响应系统与驱动系统的状态变量之间,存在一个与初值有关的误差,无论初始同步误差多大。都能使同步误差e(t)最终趋于稳定,从而实现新、旧系统的完全同步。运用该方法对蔡氏电路进行计算机仿真实验,得到的仿真结果和分析相符,证明了该方法在研究非线性电路方面是简单有效的,为今后研究类似问题提出了新思路。 相似文献
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基于反馈控制的离散混沌动力学系统的同步研究 总被引:3,自引:0,他引:3
文章研究了两个具有相同参数与不同参数的离散混沌动力学系统的同步问题,并在反馈控制下成功地实现了两个Logistic系统的同步和广义同步。特别是,在两个不同的混沌动力学系统间,实现了驱动系统的动力学行为由混沌转为周期,由周期转为混沌,以及由混沌转为另一混沌行为的控制。通过仿真实验,在两个相同与不同的Logistic系统间分别实现了三种混沌同步现象(严格同步、事实同步和基本同步)。 相似文献
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Anti‐Synchronization and Intermittent Anti‐Synchronization of Two Identical Delay Hyperchaotic Chua Systems Via Linear Control 下载免费PDF全文
Hong‐Li Li Zuolei Wang Yao‐Lin Jiang Long Zhang Zhidong Teng 《Asian journal of control》2017,19(1):202-214
This work is concerned with anti‐synchronization and intermittent anti‐synchronization of two identical delay hyperchaotic Chua systems with linear control approaches. In the first two schemes, based on Lyapunov stability theory, some sufficient conditions for achieving anti‐synchronization of two identical delay hyperchaotic Chua systems are derived, numerical simulation results are presented to demonstrate the effectiveness of the proposed anti‐synchronization schemes. In the third scheme, the anti‐synchronization conditions are obtained by numerical method. In the fourth scheme, only one state of the response system is controlled via linear control, we report an interesting phenomenon of intermittent anti‐synchronization. 相似文献