New chaotic system and its hyperchaos generation

To seek for lower-dimensional chaotic systems that have complex topological attractor structure with simple algebraic system structure, a new chaotic system of three-dimensional autonomous ordinary differential equations is presented. The new system has simple algebraic structure, and can display a 2-scroll attractor with complex topological structure, which is different from the Lorenz’s, Chen’s and L¨u’s attractors. By introducing a linear state feedback controller, the system can be controlled to generate a hyperchaotic attractor. The novel chaotic attractor, hyperchaotic attractor and dynamical behaviors of corresponding systems are further investigated by employing Lyapunov exponent spectrum, bifurcation diagram, Poincar′e mapping and phase portrait, etc., and then verified by simulating an experimental circuit.     

Stabilization of switched linear systems with constrained inputs

The stabilization of switched linear systems with constrained inputs(SLSCI) is considered. The authors design admissible linear state feedbacks and the switching rule which has a minimal dwell time(MDT) to stabilized the system.First,for each subsystem with constrained inputs,a stabilizing linear state feedback and an invariant set of the closed-loop system are simultaneously constructed, such that the input constraints are satisfied if and only if the closed-loop system’s states lie inside this set.Then,by constructing a quadratic Lyapunov function for each closed-loop subsystem,an MDT is deduced and an MDT-based switching strategy is presented to ensure the stability of the switched system.     

基于自适应同步的超混沌Chen系统的参数识别

为了研究超混沌Chen系统的完全同步及未知参数的识别及优化问题,利用两个线性控制器实现参数匹配的两个超混沌Chen系统的完全同步,研究了参数未知的超混沌Chen系统的参数辨识及优化问题,基于Lyapunov稳定性理论,解析地获得同步控制器和参数观测器表达式,其中的控制器个数低于系统维数。研究结果表明:当两个超混沌系统达到完全同步后,驱动系统的5个未知参数被准确识别。该方法在驱动系统的参数发生跃变的情况下也是有效的。     

Robust H∞ output feedback controller design for uncertain discrete-time switched systems via switched Lyapunov functions

The H∞ output feedback control problem for uncertain discrete-time switched systems is reasearched. A new characterization of stability and H∞ performance for the switched system under arbitrary switching is obtained by using switched Lyapunov function.Then,based on the characterization,a linear matrix inequality (LMI)approach is developed to design a switched output feedback controller which guarantees the stability and H∞ performance of the closed-loop system.A numerical example is presented to demonstrate the application of the proposed method.     

Consensus control design for multi-agent systems using relative output feedback

This paper studies the consensus problem of multi-agent systems in which all agents are modeled by a general linear system. The authors consider the case where only the relative output feedback between the neighboring agents can be measured. To solve the consensus problem, the authors first construct a static relative output feedback control under some mild constraints on the system model. Then the authors use an observer based approach to design a dynamic relative output feedback control. If the adjacent graph of the system is undirected and connected or directed with a spanning tree, with the proposed control laws, the consensus can be achieved. The authors note that with the observer based approach, some information exchange between the agents is needed unless the associated adjacent graph is completely connected.     

Adaptive Stabilization for a Class of Feedforward Systems with Zero-Dynamics

This paper investigates adaptive state feedback stabilization for a class of feedforward nonlinear systems with zero-dynamics,unknown linear growth rate and control coefficient.For design convenience,the state transformation is first introduced and the new system is obtained.Then,the estimation law is constructed for the unknown control coefficient,and the state feedback controller is proposed with a gain updated on-hne.By appropriate choice of the estimation law for the control coefficient and the dynamic gain,the states of the closed-loop system are globally bounded,and the state of the original system converges to zero.Finally,a simulation example is given to illustrate the correctness of the theoretical results.     

统一混沌系统非线性控制器的设计与分析

提出了一类统一混沌系统的非线性控制器的设计新方法。应用反馈精确线性化方法给出了统一混沌系统的标准型。然后利用线性控制方法对变换后的等价系统中的线性子系统进行了控制器设计,由此设计出原混沌系统的非线性控制器,并证明其具有指数稳定性。仿真结果表明利用反馈线性化方法设计的非线性控制器的有效性。     

振动二阶线性系统的鲁棒特征结构配置设计及其仿真

考虑了振动二阶线性系统的鲁棒特征结构配置设计问题。基于振动矩阵方程的参数化解,提出了振动二阶线性系统的状态反馈特征结构配置设计参数化方法。该参数化方法给出了状态反馈控制律的参数化表达式,其所含参数向量为控制系统设计提供了全部自由度。利用该参数化法提供的自由度,给出了振动二阶线性系统鲁棒特征结构配置问题的优化求解方法,其中优化的是衡量系统鲁棒性的灵敏度指标。数值算例及其仿真结果表明,所提振动二阶线性系统的状态反馈特征结构配置算法和鲁棒特征结构配置算法简单且有效,便于工程应用。     

混沌系统的逆跟踪控制

提出了一种混沌系统的逆跟踪控制方法。首先,采用非线性逆系统控制理论证明了二类连续混沌系统（Duffing系统和Lorenz 系统）的可逆性。通过状态反馈构造混沌系统的逆系统,将逆系统与原混沌系统串联,组成复合伪线性系统。在此基础上,利用线性系统综合方法设计闭环控制器,对复合伪线性系统进行控制,从而实现混沌系统对给定参考值的渐近跟踪。提出的混沌控制方法物理意义明确,系统结构简单,易于实现。仿真结果验证了该方法的有效性。     

STABILITY AND FEEDBACK CONTROL OF A CLASS OF SECOND-ORDER LINEAR SYSTEMS IN BANACH SPACE

In this paper. we are concerned with the stability and control problem for aclass of second-order linear systems in Banach space. First. a criterion for the exponentialstability of a first-order linear system is presented. Then. the exponential stability as wellas some properties of a class of second-order linear systems is proved. At last. the feedbackcontrol of this class of systems is investigated.     

FEEDBACK REALIZATION OF HAMILTONIAN SYSTEMS

1 IntroductionIn the last few decades, symplectic geometry becomes a lbcus fOr multi-disciplines. Aspointed out in [1l: '"' cIassical mechanics, statistical mechanics, and quantum mechanics aretreated from the same perspective, that ofsylllplectic geornetry thus showing the unifying powerof the symp1ectic geometric approach." Particularly it becomes a new frame fOr Hamiltoniansystems[2--5]. Symp1ectic a1gorithm, [6] etc., provides a numerical method fOr solving the relatedproblems.In contr…     

Robust H∞ output feedback controller design for uncertain discrete-time switched systems via switched Lyapunov functions

The H∞ output feedback control problem for uncertain discrete-time switched systems is reasearched. A new characterization of stability and H∞ performance for the switched system under arbitrary switching is obtained by using switched Lyapunov function.Then,based on the characterization,a linear matrix inequality (LMI)approach is developed to design a switched output feedback controller which guarantees the stability and H∞ performance of the closed-loop system.A numerical example is presented to demonstrate the application of the proposed method.     

T-S模糊系统输出直接反馈控制器设计

讨论了T-S模糊系统输出直接反馈控制器的稳定性分析和设计方法。为了减小稳定性分析的保守性和难度,充分利用模糊规则前件变量模糊隶属度函数的结构信息,对前件变量采用标准模糊分划的T-S模糊系统输出直接反馈控制器进行了研究,获得了稳定性条件。在稳定性分析的基础上,采用平行分布补偿法(PDC)和线性矩阵不等式方法(LMI),研究了输出直接反馈控制器的设计。通过对一个非线性质量块-弹簧-阻尼器系统输出反馈控制器的设计和计算机仿真,验证了方法的有效性。     

Design of saturated controllers for linear singular systems

1.INTRODUCTION Singularsystemsaredynamicalsystemswhosebehav iorsaregovernedbybothdifferentialequationsand algebraicequations.Suchsystemariseinelectrical networks,powersystems,large scalesysem,optimal controlproblems,somepopulationgrowthmodels andsoon.Theproblemofcontrollerdesignforsin gularsystemshasbeenrecentlyresearchedbymany authors[1～3].Theseresearcheswellnearastationary operatingpointwhenitisregulatedbyPID,LQ,or otherlinearcontrollers.Thecontrollawcanbecho sensuchthattheconstra…     

Delta算子系统基于输出反馈的鲁棒协方差控制

研究Delta算子描述的线性不确定系统基于输出反馈的鲁棒协方差控制问题,即设计输出反馈控制器,使Delta算子不确定系统鲁棒稳定,且稳态输出协方差矩阵具有给定上界。利用线性矩阵不等式(LMI)方法,给出Delta算子不确定系统输出反馈鲁棒协方差控制器存在的充分条件,并在此基础上,提出Delta算子不确定系统输出反馈鲁棒协方差控制器设计算法。数值算例表明设计方法的可行性。     

不确定离散广义时滞系统的静态输出反馈控制

针对一类不确定离散时滞广义系统,给出了静态输出反馈控制器的设计方法.首先基于标称离散广义时滞系统的稳定条件,以受限线性矩阵不等式形式,得到闭环离散广义时滞系统正则、因果且渐近稳定的充分条件,同时利用受限矩阵不等式的可行解给出静态输出反馈控制器的设计方法;然后采用矩阵的正交补,把求受限线性矩阵不等式的可行解问题转化为求严格线性矩阵不等式的可行解;最后的数值实例说明了所给方法的有效性和正确性.     

Synchronization of two 3-scroll hyperchaotic attractors using wavelet transform

1 .INTRODUCTIONChaotic synchronizationis a key technology in cha-otic secure communication, the low di mensionalchaotic systems have only one positive Lyapunovexponent ,the performance of securityis not ideal ,hyperchaotic systems have two or more than twopositive Lyapunov exponents , the performance ofsecurityisi mproved greatly ,sothe synchronizationof hyperchotic systems has arisen great inter-est[1 ~4].N-scroll( N =3,4,5...)attractor is akind of hyperchaotic attractor ,the method of g…     

不确定模糊系统的静态输出反馈-迭代算法

研究连续不确定T-S模糊系统的静态输出反馈控制问题。连续不确定T-S模糊系统的静态输出反馈控制稳定性的充分条件是根据可解的双线性矩阵不等式给出的。为了计算连续不确定T-S闭环模糊系统的静态输出反馈增益,提出了基于迭代线性矩阵不等式的算法。用数值仿真例子说明了该迭代线性矩阵不等式算法的有效性和收敛性。     

New type of adaptive control for a class of distributed time-delay systems with adaptation regard to delay parameter

The problem on stabilization for the system with distributed delays is researched. The distributed time-delay under consideration is assumed to be a constant time-delay, but not known exactly. A design method is proposed for a memory proportional and integral (PI) feedback controller with adaptation to distributed time-delay. The feedback controller with memory simultaneously contains the current state and the past distributed information of the addressed systems. The design for adaptation law to distributed delay is very concise. The controller can be derived by solving a set of linear matrix inequalities (LMIs). Two numerical examples are given to illustrate the effectiveness of the design method.     

具有饱和执行器跳变系统的鲁棒模型预测控制

针对一类具有饱和执行器的不确定离散Markov跳变系统,提出鲁棒模型预测控制器设计方法。为便于工程应用,考虑被控跳变系统各模态下的动态系统参数以及各模态间的跳变转移模态均存在不确定性的情形,这些不确定性均以凸多面体的形式给出。预测控制器的求解通过在每一个采样时刻优化无穷时域的最坏二次性能指标实现,该预测控制序列在每个采样时刻表现为具有饱和特性的状态反馈控制律,从而使得所形成的闭环系统鲁棒均方稳定。为方便求解,将控制器的求解转化为以线性矩阵不等式形式给出的正半定规划(SDP)问题。数值示例验证了所提方法的有效性。