Study For The Network Control Systems Based On Robust H_âˆž Control  Posted on:20101119  Degree:Master  Type:Thesis  Country:China  Candidate:L M Hong  Full Text:PDF  GTID:2178360278475387  Subject:Control theory and control engineering  Abstract/Summary:  PDF Full Text Request  The Networked Control Systems has the content of this thesis for its superiority as the development of the control system scale. Networked Control System is a new task of control theory in the 1990s, and Networked control systems are feedback control systems here in the control loops closed through the realtime network.The advantages of NCSs are reduced system wiring, ease of maintenance and diagnosis, and increased system agility. However, the insertion of the communication network in the feedback control loop, some new issue such an networked induced timedelay, network packets dropping and network scheduling appear, which all make the analysis and design of an NCS complex. In this thesis we studied stabilization of NCSs when induced timedelay and network packets dropping are considered.1. The problem of robust guaranteed cost controller design for NCS with networkinduced delay less than or equals to one sampling period is studied. For linear timeinvariant normal controlled plant, the dynamic output feedback NCS is modeled as a discrete timevariant system with uncertainty. Then basing on the Lyapunov approach and linear matrix inequality description, we study the problems of modeling, performance guaranteed optimal control, Give the method to design the performance guaranteed optimal control law for dynamic output feedback NCS.2. The problem of robust Hâˆžcontrol for a class of networked control systems with short transmission delay and limited external disturbance is investigated. There are two parts. (1) In practical control systems, the state of NCS can't always be measured. So we derive the sufficient condition and robust Hâˆžcontroller design method of asymptotic stability of dynamical output feedback NCS. (2) The state feedback NCS with control input constraints and uncertain delay less than or equals to one sampling period is modeled as a linear timevariant discrete system. Basing on the model built, we development the condition of robust stability and the design method of robust Hâˆžcontrol law for the system.3. The nonfragile Hâˆžcontrol problem is studied for a class of networked control system with timevarying long delays and limited external disturbance. By introducing the equivalent descriptor form of the system and choosing appropriate Lyapunov function, LMIbased sufficient condition for stability of the resulting closed loop system is derived, and the design method of nonfragile Hâˆžcontrol law is also presented.4. For a class of linear timeinvariant normal controlled plant with networkinduced delay and date packet dropout, the problem of modeling, exponential stability and controller design for NCS. For the given date packet dropout rate, the networked control systems can be modeled as an asynchronous dynamical system constrained by two configuration event rates. Based on the theory of asynchronous dynamical system, the sufficient condition of exponential stability for NCS is derived. Meanwhile, the dynamical output feedback controller can be solved by a...  Keywords/Search Tags:  networked control systems, networkinduced delay, robust control, guaranteed cost control, H_âˆžcontrol, linear matrix inequality, data packet dropout  PDF Full Text Request  Related items 
 
