【作者】 孙兰香；

【导师】 关守平；

【作者基本信息】 东北大学 ， 控制理论与控制工程， 2006， 硕士

【摘要】 网络控制系统(NCS)是复杂控制系统和远程控制系统的客观需求，与传统的点对点式的控制系统相比，NCS具有信息资源能够共享、连线少、易于系统扩展和维护、可靠性和灵活性高等优点，但同时由于网络通信带宽的限制，数据传输不可避免的存在延时、丢包、多包传输等问题，导致网络性能下降甚至不稳定。本文考虑了NCS中存在的多种问题，研究了基于网络的控制系统的建模和控制问题。 首先，对影响NCS性能的一些因素进行了分析。分析了几种控制网络的性能，分析了延时产生的原因及组成，并且分析了延时和数据包丢失对系统稳定性的影响。 其次，基于线性时不变工业对象模型，对包含网络的广义被控对象进行了分析与建模。这一部分主要分成单包传输和多包传输两种情况分别进行了介绍，并且每种情况都考虑了不同的网络特性。包含网络的控制系统是一种时变的控制系统，不同的网络特性下有不同的模型。本文将不同网络特性下的模型统一成一种标准形式，有利于控制器的分析和设计。 最后，在前面所建立的模型的基础上，利用极点配置方法设计了状态观测器及控制规律。状态观测器的设计分为全维状态观测器和降维状态观测器，控制规律为时变的线性状态反馈。证明了分离定理在这种设计法则下仍然成立，同时，分析了这种时变模型的稳定性问题，仿真结果证明了控制方法的有效性。更多还原

【Abstract】 Networked control system (NCS) is objectively needed by complicated control systems and remote control systems. Compared with the traditional point-to-point control systems, NCS has enormous advantages such as the shared resources of information, reduced system wiring, easy of system extending and maintenance, higher reliability and flexibility, and so on. However, because of the constraints of the communication bandwidth, the problems of network-deduced delays, packets dropout, and multiple-packet transmission are unavoidable, which degrade the performance of control systems and even make them unstable. Considering these problems, this dissertation studies the modeling and control of NCS.First, the factors affecting the performance of NCS are presented. The different characters of communication networks, the reasons why delays happen, the compositions of delays, and the influences of the network-deduced delays and packets loss to system stability are analyzed.Next, the augmented controlled plants including networks are analyzed and modeled in this dissertation, based on the linear time-invariant industrial controlled plants. The two situations of single-packet transmission and multiple-packet transmission are introduced respectively, and different properties of networks are considered in each situation. The control systems including networks are time-varying systems, and there are different models for different networked properties. A uniformed model is developed in this dissertation, which makes for the analysis and design of the controller.Finally, on the basis of the uniformed model, state observer and control law are both designed using pole-placement. The full-dimension state observer and reduced-dimension state observer are developed respectively. The control law is time-varying linear state feedback. The separation principle is proved on the basis of the control law proposed in this dissertation. Furthermore, the stability analysis of the time-varying model is presented. The simulation results show that the control strategy proposed is effective.更多还原