共查询到20条相似文献,搜索用时 187 毫秒
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王春平 《计算机测量与控制》2020,28(12):186-190
网络控制系统是通过实时网络来形成闭环反馈的控制系统。网络的介入会带来许多不确定因素,包括网络诱导时延和数据包丢失以及量化误差,它们会影响系统的稳定性,严重时甚至会导致系统失稳。本文针对短时延网络控制系统,考虑传感器-控制器和控制器-执行器两个通道都存在数据包丢失,在传感器到控制器端设立量化器,将系统建模为一个异步动态系统,利用异步动态系统指数稳定性理论、线性矩阵不等式工具分析了闭环系统稳定性,并基于MATLAB软件的线性矩阵不等式(LMI)工具箱实验仿真进行有效性验证,结果证明了方案的可行性,最后给出控制器参数的设计方法。 相似文献
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研究具有时延和数据包丢失的多输入多输出网络控制系统的指数稳定性和控制器设计问题.对在传感器与控制器、控制器与执行器间皆有时延和数据包丢失的网络控制系统结构进行了简化,建立了动态输出反馈网络控制系统模型.基于异步动态系统理论、Lyapunov稳定性原理和线性矩阵不等式方法导出网络控制系统指数稳定的半负定矩阵条件和动态输出反馈控制律设计方法.数值算例说明结果是可行的. 相似文献
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基于状态空间模型的网络化广义预测控制 总被引:1,自引:0,他引:1
针对网络化控制系统中存在的网络诱导时延和数据包丢失,考虑了基于状态空间模型的网络化广义预测控制问题,提出一种采用最小预测步长和预测控制向量分别补偿网络诱导时延和数据包丢失对系统性能影响的新方法.分别给出了存在数据包丢失、网络诱导时延以及两者同时存在情况下的控制器设计方法.仿真实验结果验证了所提出算法的有效性. 相似文献
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传统控制系统的设计方法中忽略了通信网络中的时延和数据包丢失等问题,仅通过传统方法设计的控制器来降低其对控制系统产生的不利影响,严重影响了系统的稳定性;对于水下航行器等对系统性能要求较高的水下控制平台,突破传统使其在网络环境下能够稳定运行显得尤为重要;在此背景下,提出了网络控制系统的设计方案,以水下航行器为控制平台,进行系统建模,设计反馈控制器,使用MATLAB仿真工具TrueTime,研究分析了网络体系结构下时延和丢包对传统控制系统动静态性能的影响;仿真结果表明该设计方法优化了系统性能,为系统在发生网络诱导时延和数据包丢失时能够稳定运行,提供了可靠的参考依据;该设计结果具有普适性,也可以用于导弹、坦克等航行器。 相似文献
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网络传输迟延与丢包的补偿及系统稳定性分析 总被引:4,自引:0,他引:4
针对网络传输在控制系统中引发的问题,提出在控制器节点采用针对迟延和丢包的补偿估计器.以提高控制系统的性能。当迟延小于一个采样周期且数据包传输率已定时,将包含该补偿估计器的网络控制系统(CEDPNCS),描述为具有两个事件的异步动态系统,并推导出保证系统稳定的时变双线性矩阵不等式.仿真结果表明.所提出的方法能有效提高控制系统的性能. 相似文献
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This paper deals with the problem of feedback control for networked systems with discrete and distributed delays subject to quantization and packet dropout. Both a state feedback controller and an observer-based output feedback controller are designed. The infinite distributed delay is introduced in the discrete networked domain for the first time. Also, it is assumed that system state or output signal is quantized before being communicated. Moreover, a compensation scheme is proposed to deal with the effect of random packet dropout through communication network. Sufficient conditions for the existence of an admissible controller are established to ensure the asymptotical stability of the resulting closed-loop system. Finally, a numerical example is given to illustrate the proposed design method in this paper. 相似文献
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Quantitative analysis and synthesis for networked control systems with non‐uniformly distributed packet dropouts and interval time‐varying sampling periods 下载免费PDF全文
This paper is concerned with quantitative analysis and synthesis for a networked control system under simultaneous consideration of non‐uniformly distributed packet dropouts, interval time‐varying sampling periods and network‐induced delays. A new packet dropout separation method is proposed to separate packet dropouts from the lump sum of network‐induced delays and packet dropouts. An interval time‐varying sampling period approach, which is more general than a switched sampling period approach, is presented to model the variation of the sampling period. Then a packet dropout decomposition‐based Lyapunov functional is constructed to drive some stability criteria. Based on these stability criteria, a state feedback controller is designed to asymptotically stabilize the networked system in the sense of mean‐square. Numerical examples are given to illustrate the effectiveness of the obtained results. Copyright © 2013 John Wiley & Sons, Ltd. 相似文献
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T.M.P. Gommans W.P.M.H. Heemels N.W. Bauer N. van de Wouw 《International journal of control》2013,86(10):1880-1897
In this paper, we are concerned with the stability analysis and the design of stabilising compensation-based control algorithms for networked control systems (NCSs) that exhibit packet dropouts. In order to increase the robustness against packet dropouts for such NCSs, we propose a new type of model-based dropout compensator, which depends on the local dropout history. Moreover, we provide linear matrix inequality based synthesis conditions for such compensators guaranteeing robust stability. The analysis and design framework includes both worst-case-bound and stochastic models to describe the packet-dropout behaviour in both the sensor-to-controller and the controller-to-actuator channels. Numerical examples demonstrate the significantly improved robustness with respect to packet dropouts using the proposed dropout compensator, compared to using the existing zero strategy and the hold strategy. 相似文献
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网络控制系统的H∞状态反馈控制器设计 总被引:3,自引:1,他引:2
研究了对网络控制系统如何设计H∞状态反馈控制器.这些网络控制系统中存在不确定的网络时延和数据包丢失.当网络时延和连续丢包有界时,可以将系统建模为具有时变输入时滞的系统,利用Lyapunov-Krasovskii泛函,推导出网络控制系统渐近稳定的充分条件.将这些充分条件转化为带等式约束的LMIs,并对他们进行迭代求解,就可以构造H∞控制器.与现有结果相比,在推导稳定性条件时本文对交叉项采取了更紧的界定,并且在设计控制器时无需知道调节参数.因此,本文提出的方法具有更低的保守性.仿真结果说明了本方法的正确性和有效性. 相似文献
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It has become a common practice to employ networks in control systems for connecting controllers and sensors/actuators on
controlled plants and processes. A network-based switched control system, as a special case of networked control systems,
is studied. Such a system is represented with network-induced delays and packet dropout as a switched delay system. Sufficient
conditions for robust exponential stability are derived for a class of switching signals with average dwell time. A stabilization
design for continuous-time, linear switched plant with nonlinear perturbation under a given communication network via a hybrid
state feedback controller is proposed. A hybrid controller design is network-dependent and given in terms of linear matrix
inequalities. 相似文献
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In this paper, the stabilization problem for a class of networked control systems (NCSs) with data packet dropouts and transmission time delays is considered, where the delays are time-varying and uncertain, the data packet dropout is modeled as a two-state Markov chain. To compensate the lost packet, a data packet dropout compensator is established. Thus a more realistic model for such NCSs is presented. Sufficient conditions for the stabilization of the new resulting system are derived in the form of linear matrix inequalities (LMIs). Numerical example illustrates the solvability and effectiveness of the results. 相似文献
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In this paper, the stabilization problem for a class of networked control systems (NCSs) with data packet dropouts and transmission time delays is considered, where the delays are time-varying and uncertain, the data packet dropout is modeled as a two-state Markov chain. To compensate the lost packet, a data packet dropout compensator is established. Thus a more realistic model for such NCSs is presented. Sufficient conditions for the stabilization of the new resulting system are derived in the form of linear matrix inequalities (LMIs). Numerical example illustrates the solvability and effectiveness of the results. 相似文献
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In this article, adaptive state feedback stabilising controllers for networked adaptive control systems with unknown actuator failures are developed. The problems of networked control systems (NCSs) such as transmission delays and data-packets dropout, induced by the insertion of data networks in the feedback adaptive control loops are also considered. The novelty of this article consists in the combination of different aspects in NCSs: state tracking control of systems with unknown parameters, unknown actuator failures, network-induced delays and data-packets dropout. Normalised adaptive laws are designed for updating the controller parameters. Sufficient conditions for Lyapunov stability are derived in the case of uncertainty due to actuator failures, delays and data-packets dropout. Simulation results are given to illustrate the effectiveness of our design approach. 相似文献