共查询到18条相似文献,搜索用时 140 毫秒
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基于有界时延、无数据包丢失、传感器时钟驱动、执行器事件驱动,文章提出了用一个特定的实值函数来调节动态输出反馈控制器的输出以确保控制对象输入有界的方法,建立了具有分布时延、有界输入、动态输出反馈网络控制系统的非线性数学模型.用李雅普诺夫第二方法和线性矩阵不等式描述分析了系统的渐近稳定性,并推导出与时延无关的系统渐近稳定的充分条件.最后MATLAB仿真算例说明:稳定判据是可行的,有界输入的控制方法是有效的. 相似文献
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研究了一类时变对象网络控制系统的建模和稳定性问题,推导了该类网络控制系统的时滞连续时间数学模型,并基于李雅普诺夫第二法,分析了系统的渐近稳定性,得到了系统稳定运行的最大允许时延。最后,通过实例分析证实了本文所提理论的有效性,以及稳定判据的可行性。 相似文献
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针对一类多延时多变量网络控制系统(NCS),讨论其建模和稳定性问题.首先假设传感器采用时间驱动、控制器和执行器采用事件驱动,建立了系统在连续时域~MIMO数学模型;然后根据Lyapunov稳定性原理和Razumikhin定理,构造系统的Lyapunov函数,并分析系统的渐近稳定性,进而得到了系统稳定的时延参数和稳定性条件;最后通过仿真实例验证了该类网络控制系统的稳定判据. 相似文献
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针对无线传感器网络(WSNs)测控系统时延现象较为突出的特点,从确保测控系统控制的稳定性出发,根据李亚普诺夫(Lyapunov)稳定性的相关理论,在测控系统信息传输模型分析的基础上,建立系统渐进稳定的最大时延不等式,并结合温室WSNs测控系统的实际情况,以温度和湿度参数为研究对象对系统进行具体分析,利用Matlab中LMI工具箱,计算出在确保系统渐近稳定情况的最大允许时延,通过温室WSNs测控系统实例稳定性仿真分析表明:最大允许时延可为创建稳定的WSNs测控系统提供理论依据。 相似文献
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针对网络控制系统中时延不确定因素,将时延的不确定性转换为系统状态方程系数矩阵的不确定性,基于LMI和Lyapunov理论,研究了一类具有时延的网络控制系统的稳定性问题,并运用Lyapunov方法和线性矩阵不等式对不确定时延系统进行了稳定性分析。并以Riccati不等式和线性矩阵不等式的形式给出了系统稳定的充分条件,使得在不确定时延情况下,系统达到理想稳定性。最后,通过Matlab工具箱对数值结果进行仿真,在时延相关情况下,求得系统达到闭环稳定时最大允许的时延,表明了设计方法的有效性。 相似文献
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This paper proposes a method for robust state feedback controller design of networked control systems with interval time‐varying delay and nonlinearity. The key steps in the method are to construct an improved interval‐delay‐dependent Lyapunov functional and to introduce an extended Jessen's inequality. Neither free weighting nor model transformation is employed in the derivation of system stability criteria. It is shown that the maximum allowable bound on the nonlinearity could be computed through solving a constrained convex optimization problem; and the maximum allowable delay bound and the feedback gain of a memoryless controller could be derived by solving a set of linear matrix inequalities. Numerical examples are given to demonstrate the effectiveness of the proposed method. Copyright © 2007 John Wiley & Sons, Ltd. 相似文献
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This article addresses the problem of controller design for networked control systems over digital communication. The systems under consideration are stabilised via state feedback, where the effects of sampled signal, state quantisation, network-induced delay and packet dropout are considered. The proposed delay-dependent stability criteria are formulated in the form of a linear matrix inequality, which ensure asymptotic stability and a prescribed H ∞ performance level for networked control systems with admissible uncertainties. Maximum allowable delay bound of networked control systems is obtained by solving a convex optimisation problem. Furthermore, a numerical example is given to illustrate the effectiveness of the main result. 相似文献
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The paper deals with the problem of the asymptotic stability for general continuous nonlinear networked control systems (NCSs). Based on Lyapunov stability theorem combined with improved Razumikhin technique, the sufficient conditions of asymptotic stability for the system are derived. With the proposed method, the estimate of maximum allowable delay bound (MADB) for linear networked control system is also given. Compared to the other methods, the proposed method gives a much less conservative MADB and more general results. Numerical examples and some simulations are worked out to demonstrate the effectiveness and performance of the proposed method. 相似文献
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《Simulation Modelling Practice and Theory》2007,15(5):513-520
This paper is concerned with a new method to obtain a maximum allowable delay bound guaranteeing the stability of networked control systems with multi-step delay. The proposed method is formulated in terms of linear matrix inequalities. Simulation results show that the proposed method is effective. 相似文献
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In this paper, delay-dependent robust stability for a class of uncertain networked control systems (NCSs) with multiple state time-delays is investigated. Modeling of multi-input and multi-output (MIMO) NCSs with networkinduced delays and uncertainties through new methods are proposed. Some new stability criteria in terms of LMIs are derived by using Lyapunov stability theory combined with linear matrix inequalities (LMIs) techniques. We analyze the delay-dependent asymptotic stability and obtain maximum allowable delay bound (MADB) for the NCSs with the proposed methods. Compared with the reported results, the proposed results obtain a much less conservative MADB which are more general. Numerical example and simulation is used to illustrate the effectiveness of the proposed methods. 相似文献