Research On Stability Of Networked Control System With Uncertain Time-delay

Networked control system (NCS) is the collection communication network and control system in one of the more complicated control system, it relates to many subject areas, such as cybernetics, computer science, information theory, mechanical and electronic engineering, software engineering, reliability theory,etc.With the development of science and technology, the control system under the network environment more and more applied to complex industrial control areas, such as DC control system, weapon system, remote medical treatment and robot remote operation, remote teaching and experiment, fieldbus and industrial Ethernet technology, control education field, building automation, home automation, intelligent vehicle system, aerospace, mobile sensor networks, etc. So, to establish and perfect the systematic network control theory and the control method is imminent, but also the demand of Modern times, there are great significances for networked control system.But due to the introduction of the Internet, networked control system is different from traditional control system, the main characteristic of networked control system structure is that sensors, controller and actuators are not point-to-point directly connected, but rather through cable network or wireless network exchange data and control information, so there will has many distinct characteristics. These characteristics has also decided the networked control systems research method is different from the general control system, we must according to its characteristic, take effective methods of analysis and formulate the effective solutions, design the correct control algorithm, to solve some practical problems, it has great significance.This paper mainly studies is research on the stability of networked control system with uncertain time-delay, use Lyapunov stability theory and knowledge of linear matrix inequalities, to research on this problem. The main research contents that are as follows:1. Caused by networked control system was studied with some of the reasons and delay network time delay appears data packet loss, packet disorderly sequence and so on the related question. These problems can become the influence networked control system performance of these factors, an important factor in the study would lead to a better system is analyzed2. For a short delay networked control system with stability is analyzed. Studied the short delay networked control system model to describe the sensor node, proof for time drive, controller nodes and actuators node is the event-driven uncertain delay networked control system can be equivalent to a class with parameter uncertainties linear discrete system; Finally, using the Lyapunov method gives the closed-loop system is asymptotically stable and use the LMI, sufficient conditions for solving, have proved the feasibility of this method.3.With uncertain delay networked control system stability. For the delay's networked control system to determine, assuming the transmission delay is not affirmatory, sensor adopts time drive, controller and actuator adopts event-driven, model the system for a class of uncertain linear discrete system, through the tectonic lyapunov function, combined with linear matrix inequality (LMI), and the relevant knowledge to analyze the stability of system, and gives the sufficient conditions for the robust stability of the system, and finally gives an example of simulation with MATLAB and the correctness of the conclusion.4. Finally, the contents of this study are summarized; the stability of networked control system with time-delay is forecasted.