共查询到19条相似文献,搜索用时 140 毫秒
1.
2.
3.
研究了具有时变时滞与多数据包丢失的网络控制系统(networked control systems,NCSs)的量化H∞控制问题.同时考虑传感器-控制器间的测量通道及控制器-执行器间的控制通道的多数据包丢失,并将其用满足Bernoulli分布的随机变量来表示.控制输入信号和测量输出信号分别在传感器和控制器两侧进行对数量化,量化误差描述为扇区有界不确定性.利用Lyapunov理论和线性矩阵不等式方法,得到了使得闭环NCSs满足一定H∞性能指标的均方意义下指数稳定充分条件,并给出了基于观测器的时滞相关控制器设计方法.最后,通过实例证明了该方法的有效性. 相似文献
4.
针对具有随机丢包的Lipschitz非线性网络化控制系统,研究了系统存在外部干扰情况下的鲁棒故障检测问题。由于带宽有限,传感器-控制器和控制器-执行器的网络通道中存在随机数据包丢失,鉴于此,设计一种基于观测器的故障检测滤波器,给出存在故障检测滤波器的充分条件,使误差系统均方指数稳定并达到鲁棒H∞干扰抑制水平,同时给出基于观测残差均方值的故障检测策略。通过仿真算例验证了所提出方法的有效性。 相似文献
5.
6.
7.
针对一类控制器增益存在摄动的不确定非线性网络切换系统,在系统同时存在随机时变时滞和数据包丢失的情况下,研究系统的非脆弱H∞控制问题.首先,利用T-S模型,将非线性网络切换系统建模为网络切换模糊系统;其次,将数据包丢失作为时滞处理,并采用Bernoulli分布的随机序列描述该时滞;再次,采用平均驻留时间的方法(ADT)设计系统的切换律及非脆弱状态反馈控制器,并给出网络切换模糊时滞系统指数稳定的平均驻留时间条件;最后,结合李雅普诺夫(LKF)方法给出系统均方指数稳定且满足H∞性能指标的充分条件.仿真结果验证了所提出设计方法的有效性. 相似文献
8.
9.
针对一类具有随机时延的网络控制系统(NCSs)周期反馈控制问题,提出一个新颖的马尔可夫随机时滞系统模型.该模型包括一个分段常数广义采样保持函数(PCGSHF)以及一个用于描述网络诱导时延和数据包丢失的马尔可夫链.应用李亚普诺夫方法以及线性矩阵不等式技术得到了闭环 NCSs 随机稳定的充分条件,并给出了状态反馈控制器和 PCGSHF 的设计方法.最后,通过仿真算例验证了设计方法的有效性. 相似文献
10.
11.
12.
Stabilization problems of networked control systems (NCSs) with bounded packet losses and transmission delays are addressed. We model such NCSs as a class of switched systems, and establish stabilizing conditions in the form of matrix inequalities by using packet‐loss dependent Lyapunov functions. By solving the inequalities, packet‐loss dependent controllers are designed for two types of packet‐loss processes: one is an arbitrary packet‐loss process, and the other is a Markovian packet‐loss process. Several numerical examples and simulations are worked out to demonstrate the effectiveness of the proposed design techniques. Copyright © 2010 John Wiley & Sons, Ltd. 相似文献
13.
将网络控制系统(NCSs) 的未知短时延处理成范数有界不确定性, 结合Markov 丢包影响将NCSs 建模为不确定Markov 跳变系统, 设计模态依赖的鲁棒故障检测滤波器. 为了提高检测系统性能, 采用后置滤波器对残差信号进行时域优化, 并以Moore-Penrose 逆形式给出其最优解. 同时, 设计自适应检测阈值, 并给出时变参数阵的迭代方法,降低了计算量. 数值仿真表明, 所提出的方法能够有效地抑制时延和丢包影响, 提高故障检测系统的检测能力和检测速度.
相似文献14.
针对存在时变短时延和丢包的网络控制系统故障检测问题,将非线性对象建模为线性切换系统.考虑工程中存在的局部交叠切换律,将切换系统划分为若干局部交叠切换于系统.同时,考虑滤波器切换滞后引起的异步切换问题,进一步将系统增广为局部交叠异步切换系统.在此基础上,结合公共Lyapunov函数和平均驻留时间方法,以LMI形式给出检测滤波器设计方法.最后,通过某网络化飞行器的全包线飞行验证了所提出方法的有效性. 相似文献
15.
Yue Long 《International journal of systems science》2013,44(6):1150-1159
This article addresses the stochastic fault detection (SFD) problem in finite-frequency domain for a class of networked control systems (NCSs) with respect to signal quantisation and data packet dropout. Considering a logarithmic quantiser and Markovian packet dropout, the NCS is modelled as a Markov jump linear system (MJLS) with quantisation error. Further, a new definition of finite-frequency stochastic H ? index is given, which gives a measurement of sensitivity. Subsequently, sufficient conditions are derived to guarantee that the MJLS can achieve such a performance. By virtue of the obtained conditions, the fault detection filters (FDFs) are designed in finite-frequency domain, which are valid in characterising the disturbance attenuation performance and finite-frequency fault sensitivity performance. Finally, a simulation example is given to illustrate the method and its effectiveness. 相似文献
16.
本文研究了存在时变短时延和随机丢包的大包线网络化飞行器故障检测问题.首先,采用切换多胞系统描述飞行动态,并提出了一种局部重叠多胞划分方式以较低设计保守性.然后,借助泰勒级数展开和伯努利分布将时延和丢包转化为多胞系统参数,并构建了切换参数依赖故障检测滤波器.同时,考虑滤波器切换指令及多胞加权参数更新滞后引起的异步切换问题,基于切换参数依赖Lyapunov函数和平均驻留时间方法分析了系统的稳定性和l2性能,并以LMI形式给出了滤波器存在的充分条件.最后,以HiMAT(highly maneuverable technology)飞行器为例验证了所提方法的有效性. 相似文献
17.
Tian Engang Peng Chen Gu Zhou 《International Journal of Control, Automation and Systems》2012,10(2):444-448
This paper concerns the fault tolerant control for discrete networked control systems (NCSs) with probabilistic sensor and
actuator fault, random delay and packet dropout. The fault of each sensor or actuator happens in a random way, which is described
by an individual random variable satisfying a certain probabilistic distribution. Using these stochastic variables in the
system model, new type of NCSs fault model is proposed. The merit of the proposed fault model lies in its generalization and
reality, which can cover some existing fault models as special cases. By using Lyapunov functional method and linear matrix
inequality technology, sufficient conditions for the mean square stable (MSS) of the NCSs can be obtained. Then the reliable
controller can be designed. Finally, a numerical example and a practical example are given to demonstrate the efficiency and
application of the proposed method. 相似文献
18.
This paper investigates the robust tracking control problem for a class of nonlinear networked control systems (NCSs) using the Takagi-Sugeno (T-S) fuzzy model approach. Based on a time-varying delay system transformed from the NCSs, an augmented Lyapunov function containing more useful information is constructed. A less conservative sufficient condition is established such that the closed-loop systems stability and time-domain integral quadratic constraints (IQCs) are satisfied while both time-varying network-induced delays and packet losses are taken into account. The fuzzy tracking controllers design scheme is derived in terms of linear matrix inequalities (LMIs) and parallel distributed compensation (PDC). Furthermore, robust stabilization criterion for nonlinear NCSs is given as an extension of the tracking control result. Finally, numerical simulations are provided to illustrate the effectiveness and merits of the proposed method. 相似文献