具有随机协议网络化系统的H_∞滤波

本文研究了一类具有随机介质访问协议网络化系统的H∞滤波问题.将传感器和滤波器的通信过程描述为一个马尔可夫链,进而将滤波误差系统建模成一个马尔可夫跳变系统.然后,运用李雅普诺夫方法和线性矩阵不等式技术,给出了滤波误差系统随机稳定且具有给定H∞性能的一个充分条件,并基于该条件给出了H∞滤波器的设计方法.最后的数值算例验证了本文方法的有效性.     

基于时滞的H∞滤波器设计及其在网络中的应用

本文讨论了基于时滞的不确定线性系统的H∞滤波器设计及其在网络中的应用问题. 首先考虑时滞的上下界, 并在不忽略Lyapunov泛函导数中的任何一项的前提下, 利用自由权矩阵方法, 提出了一种新的滤波误差系统的H∞性能分析和滤波器设计方法. 而且, 滤波器的系数矩阵可以通过解一组线性矩阵不等式(LMIs)得到. 然后, 将该方法应用于考虑网络影响的具有参数不确定性的线性系统的滤波问题. 与已有文献的方法相比, 结果的保守性大 大降低. 最后给出的数值实例说明了本文所给方法的有效性和优越性.     

Delay-dependent H-infinity control for continuous time-delay systems via state feedback

The delay-dependent H-infinity analysis and H-infinity control problems for continuous time-delay systems are studied. By introducing an equality with some free weighting matrices, an improved criterion of delay-dependent stability with H-infinity performance for such systems is presented, and a criterion of existence and some design methods of delay-dependent H-infinity controller for such systems are proposed in term of a set of matrix inequalities, which is solved efficiently by an iterative algorithm. Further, the corresponding results for the delay-dependent robust H-infinity analysis and robust H-infinity control problems for continuous time-delay uncertain systems are given. Finally, two numerical examples are given to illustrate the efficiency of the proposed method by comparing with the other existing results.     

An LMI approach to robust H-infinity control for uncertain singular time-delay systems

The problem of robust H-infinity control for a class of uncertain singular time-delay systems is studied in this paper. A new approach is proposed to describe the relationship between slow and fast subsystems of singular time- delay systems, based on which, a sufficient condition is presented for a singular time-delay system to be regular, impulse free and stable with an H-infinity performance. The robust H-infinity control problem is solved and an explicit expression of the desired state-feedback control law is also given. The obtained results are formulated in terms of strict linear matrix inequalities (LMIs) involving no decomposition of system matrices. A numerical example is given to show the effectiveness of the proposed method.     

An LMI approach to robust H-infinity control for uncertain singular time-delay systems

The problem of robust H-infinity control for a class of uncertain singular time-delay systems is studied in this paper. A new approach is proposed to describe the relationship between slow and fast subsystems of singular time- delay systems, based on which, a sufficient condition is presented for a singular time-delay system to be regular, impulse free and stable with an H-infinity performance. The robust H-infinity control problem is solved and an explicit expression of the desired state-feedback control law is also given. The obtained results are formulated in terms of strict linear matrix inequalities （LMIs） involving no decomposition of system matrices. A numerical example is given to show the effectiveness of the proposed method.     

一类不确定非线性离散时滞系统的鲁棒H∞滤波设计

考虑一类同时带有非线性动态和参数不确定性的离散时滞系统的鲁棒H∞滤波设计问题．假设参数不确定性具有线性分式形式,而非线性动态满足Lipschitz条件,给出滤波器使误差系统鲁棒渐近稳定且达到指定的干扰抑制水平．对参数已知情形,先建立广义有界实引理,然后给出H∞滤波器的存在条件,证明了H∞滤波器的存在性可归结为线性矩阵不等式的可解性,基于线性矩阵不等式给出了H∞滤波器的综合方法和步骤．对参数不确定性情形,通过引进标度参数,将不确定非线性离散时滞系统的鲁棒H∞滤波问题转化为确定系统的H∞滤波设计．最后给出仿真例子验证所得结果的有效性．     

一类不确定非线性离散时滞系统的鲁棒H∞滤波设计

考虑一类同时带有非线性动态和参数不确定性的离散时滞系统的鲁棒H-infinity滤波设计问题. 假设参数不确定性具有线性分式形式, 而非线性动态满足Lipschitz条件, 给出滤波器使误差系统鲁棒渐近稳定且达到指定的干扰抑制水平. 对参数已知情形, 先建立广义有界实引理, 然后给出H-infinity滤波器的存在条件, 证明了H-infinity滤波器的存在性可归结为线性矩阵不等式的可解性, 基于线性矩阵不等式给出了H-infinity滤波器的综合方法和步骤. 对参数不确定性情形, 通过引进标度参数, 将不确定非线性离散时滞系统的鲁棒H-infinity滤波问题转化为确定系统的H-infinity滤波设计. 最后给出仿真例子验证所得结果的有效性.     

一类存在数据丢失二维离散系统的H∞滤波

研宄输出测量数据丢失情况下二维线性离散系统的H_∞。滤波问题.首先,将数据丢失现象描述为随机伯努利序列,在此基础上建立二维系统状态估计误差的随机动态方程.其次,定义随机意义下的二维系统均方渐近稳定性和H_∞。性能,基于线性矩阵不等式给出误差系统满足均方渐近稳定和H_∞。性能的一个充分条件,该条件可以实现滤波器参数矩阵的设计.同时,研宄结果被进一步推广到不确定二维系统.最后,通过仿真示例验证了理论结果的有效性.     

数值界不确定性关联大系统分散鲁棒H∞控制

针对一类状态阵,控制输入阵及关联阵中存在数值界不确定性的关联大系统,研究其分散鲁棒H∞状态反馈和输出反馈控制器设计问题.基于有界实引理,推导出了其存在分散鲁棒H∞控制器的充分条件,即一组矩阵不等式有解.利用Schur补引理,通过固定不同变量,提出了一种构建分散控制器的同伦迭代线性矩阵不等式方法.所获得的控制器使闭环大系统鲁棒稳定,并且达到给定的H∞性能指标.最后用数值例子说明了所提的设计方法的有效性.     

Robust H-infmity estimation for continuous-time polytopic uncertain systems

1IntroductionAs a fundamental problem in control area,linearestimation has been extensively investigated since Kalmanpresented the optimal filteringtheory[1].It is well knownthat the Kalmanfilteringtheoryis based onthe assumptionsthat the accurate mathematical models of the consideredsystems and the statistics features of the noise inputs areknown.Inthis setting,the Kalmanfilteringis also called H2filtering,which minimizes the H2norm of the operatorfromthe external input to the estimation er…     

Delta算子描述系统的非脆弱H∞滤波器设计

研究了一类Delta算子描述的线性系统非脆弱H_∞滤波问题. 所设计的滤波器具有乘性的滤波器增益变化.采用线性矩阵不等式方法, 给出H_∞滤波器存在的充分条件, 所设计的滤波器在一定的乘性参数变化情况下, 仍能保证滤波误差系统渐近稳定, 且具有一定扰动抑制性能. 数值仿真例子说明了设计方法的有效性.     

Robust H-infinity filtering on uncertain systems under sampled measurements

This paper is concerned with the problem of robust H-infinity filtering on uncertain systems under sampled measurements, both continuous disturbance and discrete disturbance are considered in the systems. The parameter uncer- tainty is assumed to be time-varying norm-bounded. The aim is to design an asymptotically stable filter, using the locally sampled measurements, which ensures both the robust asymptotic stability and a prescribed level of H-infinity performance for the filtering error dynamics for all admissible uncertainties. The derivation process is simplified by introducing auxiliary systems and the sufficient condition for the existence of such a filter is proposed. During the study, the main results were expressed as LMIs by employing various matrix techniques. Using LMI toolbox of Matlab software, it is very convenient to obtain the appropriate filter. Finally, a numerical example shows that the method is effective and feasible.     

Robust H-infinity filtering on uncertain systems under sampled measurements

1 Introduction Sampled measurements systems consist of a continuous- time plant and discrete-time plant. The systems contain sig- nals that evolve in continuous time as well as signals that evolve in discrete time. It is rather difficult to apply the stan- dard analysis results for linear continuous-time systems and discrete-time systems to the analysis of sampled measure- ments systems [1]. This fact has motivated much of the re- search on the analysis and synthesis of sampled measure- ments …     

基于LMI的约束系统H∞控制及其滚动优化实现

在LMI优化框架下,讨论有时域硬约束线性系统的H_∞控制问题.首先提出了一种基于LMI优化的状态反馈方法,并给出了闭环系统保证H_∞性能和满足时域硬约束的条件.在此基础上,融合预测控制的滚动优化原理讨论了一种滚动时域H_∞性能控制方法.通过对H_∞性能指标γ的在线最小化,闭环系统能实时协调控制性能要求和硬约束,并充分利用有限的控制能力提高控制性能.     

具有随机通讯时延的离散网络化系统的H∞滤波器设计

由于传感器和滤波器是通过有限带宽的网络连接的,因此系统的测量数据经常会出现时延,而且时延是随机的.本文讨论了具有一步随机通讯时延的离散网络化系统的H∞滤波器设计问题.利用线性矩阵不等式方法设计线性滤波器使得滤波误差系统是均方意义下指数稳定并具有给定的H∞性能.滤波器参数通过凸优化技术求解一个线性矩阵不等式得到.数值仿真表明设计方法的有效性.