具有一步随机时滞和多丢包的网络系统H∞滤波器设计

在网络系统中由于连接传感器和滤波器的网络带宽有限,系统测量数据在传输中会出现随机时延甚至丢失. 本文讨论了具有一步随机时延和丢包的网络系统的H∞滤波器设计问题.基于新近提出的同时描述随机时延和丢包的模型,利用线性矩阵不等式方法设计线性滤波器,使得滤波误差系统均方指数稳定,并具有给定的H∞性能. 滤波器参数通过求解一个线性矩阵不等式得到.仿真研究说明了所提出算法的有效性.     

随机时延网络化不确定系统的鲁棒H∞滤波

研究了一类具有随机时延的网络化不确定系统的 H∞ 滤波器设计问题. 这类时延的产生是由于传感器和滤波器通过有限带宽的网络连接而引起的系统测量数据的滞后, 而且它是随机发生的. 本文采用满足 Bernoulli 分布随机变量来描述测量数据的这种随机时延. 利用线性矩阵不等式, 给出了全阶和降阶的滤波器存在的充分条件. 所设计的滤波器使得滤波误差系统是均方指数稳定且具有给定的H∞ 性能. 数值仿真表明设计方法的有效性.     

具有随机一步时延及丢包的离散系统H∞滤波

针对存在随机一步时延及丢包的网络,研究了一类离散系统的H∞滤波问题。时延及丢包被认为是两个Bernoulli随机序列,利用线性矩阵不等式(LMI)方法给出了滤波器存在的充分条件,所设计的滤波器使得滤波误差系统在均方意义下是指数稳定的且满足给定的H∞性能。滤波器参数通过凸优化求解一个线性矩阵不等式获得。     

一类线性Markov 跳跃区间时滞系统的 鲁棒??∞ 故障检测滤波器设计

研究一类线性Markov跳跃区间时滞系统的鲁棒H∞故障检测滤波器设计问题.采用基于自适应观测器的故障检测滤波器作为残差产生器,将鲁棒H∞故障检测滤波器设计问题归结为随机H∞滤波问题.应用Lyapunov-Krasovskii方法,通过引入松弛矩阵推导证明了问题可解的时滞依赖充分条件,并进一步通过求解线性矩阵不等式给出了故障检测滤波器参数矩阵的解.仿真算例验证了所提出方法的有效性.     

具有随机通讯时延的网络化系统的l2-l∞滤波

研究具有随机通讯时延的离散网络化系统的l2-l∞滤波器设计问题.采用满足Bernoulli分布随机变量描述测量数据的一步随机时延;利用线性矩阵不等式方法设计线性滤波器,使得滤波误差系统在均方意义下指数稳定,并保证对于所有有界的外界扰动信号,滤波误差系统具有一定的l2-l∞扰动衰减水平.数值仿真表明了所提出设计方法的有效性.     

具有谱约束的随机系统的H∞滤波

研究具有谱约束的随机线性系统H∞滤波,假设系统方程由伊藤随机微分方程描述,可通过重新定义随机系统谱算子,找到随机系统既满足α-域稳定,又满足H∞性能指标的充分条件.通过解一组线性矩阵不等式,可设计随机系统α-域稳定的H∞滤波器.     

具有长时延及丢包的网络控制系统H∞ 鲁棒滤波

研究了同时具有大于一个采样周期的随机传输时延及数据包丢失的网络控制系统H∞滤波问题.对于给定的丢包率,滤波误差系统被建模为具有两个事件速率约束的异步动态系统,利用异步动态系统理论给出滤波误差系统满足指数稳定和H∞性能指标的充分条件.H∞滤波器可通过解一组线性矩阵不等式求出.仿真结果验证了所提出方法的有效性.     

一类丢包时延网络控制系统的鲁棒H∞滤波

用随机马尔可夫跳变系统描述一类具有丢包时延的网络控制系统．为这类网络控制系统设计马尔可夫跳变滤波器,保证了滤波误差系统均方意义下随机渐近稳定,且噪声信号对估计误差的影响低于指定H∞ 性能水平,滤波器参数可通过求解线性矩阵不等式得到．最后通过仿真实例验证了所得结论的正确性和滤波器设计方法的有效性．     

线性系统的非脆弱H∞ 滤波

考虑一类线性系统的非脆弱H∞滤波器设计问题.所设计的滤波器具有秉性的滤波器增益变化.采用线性矩阵不等式方法,给出线性连续系统和离散系统的非脆弱H∞滤波器存在的充要条件.数值仿真例子说明了设计方法的有效性.     

不确定离散时间系统的变增益H2H∞滤波

研究凸多面体不确定离散时间系统的变增益H2/H∞滤波器设计问题.通过引入附加松弛变量,提出一种新的Lyapunov矩阵与系统矩阵解耦的混合H2/H∞性能准则.基于该性能准则,推导了变增益H2/H∞滤波器存在的充分条件,并将滤波器设计问题转化为具有线性矩阵不等式约束的凸优化问题.仿真结果表明了所提出方法的有效性.     

Reliable H-infinity filtering for linear systems with sensor saturation

In this paper, a new reliable H-infinity filter design problem is proposed for a class of continuous-time systems with sensor saturation and failures. Attention is focused on the analysis and synthesis problems of a full order reliable H-infinity filter such that the filtering error dynamics is asymptotically stable with a guaranteed disturbance rejection attenuation level γ. It is shown that the filtering error dynamics obtained from the original system plus the filter can be modeled by a linear system with sector bounded nonlinearity. The design conditions are given in terms of solutions to a set of linear matrix inequalities (LMIs). These conditions are then considered in a convex optimization problem with LMIs constraints in order to design an optimal reliable H-infinity filter. A numerical example is given to illustrate the effectiveness of the proposed results.     

一种基于LMI的鲁棒故障诊断滤波器设计

研究了一类含有扰动的线性系统鲁棒故障诊断滤波器设计问题. 文中引入一种能同时体现残差对扰动信号鲁棒性和对故障信号灵敏性的性能指标, 利用H_∞理论把求解滤波器的问题转化为H_∞优化设计问题. 应用线性矩阵不等式(LMI)技术, 对此性能指标进行优化, 给出并证明了该设计问题解的存在性条件和滤波器增益阵的求解方法, 最后, 通过仿真实例验证了方法的有效性.     

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.     

Robust H-infinity filtering for time-delay systems with missing measurements: a parameter-dependent approach

Robust H-infinity filtering for a class of uncertain discrete-time linear systems with time delays and missing measurements is studied in this paper. The uncertain parameters are supposed to reside in a convex polytope and the missing measurements are described by a binary switching sequence satisfying a Bernoulli distribution. Our attention is focused on the analysis and design of robust H-infinity filters such that, for all admissible parameter uncertainties and all possible missing measurements, the filtering error system is exponentially mean-square stable with a prescribed H-infinity disturbance attenuation level. A parameter-dependent approach is proposed to derive a less conservative result. Sufficient conditions are established for the existence of the desired filter in terms of certain linear matrix inequalities (LMIs). When these LMIs are feasible, an explicit expression of the desired filter is also provided. Finally, a numerical example is presented to illustrate the effectiveness and applicability of the proposed method. Robust H-infinity filtering; Polytopic uncertainties; Missing measurements; Time-delays; Parameter dependent; Linear matrix inequalities (LMIs)     

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.     

Robust H-infinity filtering for time-delay systems with missing measurements： a parameter-dependent approach

Robust H-infinity filtering for a class of uncertain discrete-time linear systems with time delays and missing measurements is studied in this paper. The uncertain parameters are supposed to reside in a convex polytope and the missing measurements are described by a binary switching sequence satisfying a Bernoulli distribution. Our attention is focused on the analysis and design of robust H-infinity filters such that, for all admissible parameter uncertainties and all possible missing measurements, the filtering error system is exponentially mean-square stable with a prescribed H-infinity disturbance attenuation level. A parameter-dependent approach is proposed to derive a less conservative result. Sufficient conditions are established for the existence of the desired filter in terms of certain linear matrix inequalities （LMIs）. When these LMIs are feasible, an explicit expression of the desired filter is also provided. Finally, a numerical example is presented to illustrate the effectiveness and applicability of the proposed method.     

随机时延网络控制系统的H∞输出反馈控制器设计

研究了一类具有随机通讯时延的网络控制系统的控制器设计问题.同时考虑了控制器和执行器之间,控制器和传感器之间这两类由于有限网络带宽而出现的随机传输时延.采用满足Bernoulli分布的二进制序列来描述数据传输的随机时延.利用矩阵不等式方法给出了动态输出反馈控制器存在的充分条件,所设计的控制器使得闭环系统是均方意义下指数稳定并具有给定的H∞性能.采用SLPMM(sequentially linearprogramming matrix method)给出了控制器的求解算法.仿真算例说明该方法的有效性.     

Delay-dependent robust H-infinity control for discrete-time uncertain systems with time-varying state delays

1 Introduction The analysis and synthesis of dynamic control systems with time delays is a subject of great practical and theo- retical importance, and has received considerable attention for decades (see [1,2] and references therein). Stability cri- teria can be classified roughly into two categories: delay- independent and delay-dependent [3]. Delay-independent criteria contains no information on the delay size, which, as might be expected, is generally conservative, especially when the dela…     

H-infinity control for networked control systems （NCS） with time-varying delays

1Introduction Ina networkedcontrol system(NCS),a communicationnetwork connects sensors,actuators and controllers.AnNCS has many advantages over the point_to_pointcommunication of traditional control systems:fast and easymaintenance,low cost,greater flexibility,etc.Therefore,NCSs are increasingly being usedfor industrial control in avariety of fields[1,2].On the other hand,control loopsonthe communication network are closedin an NCS.Thetime delays that occur when information is transmitte…