Fan Weihua

Fuzzy model and control of nonlinear networked control systems

Tins paper is concerned with a class of nonlinear networked control systems with network-induced delay shorter than one sample period. Based on the assumptions that the actuator node is time-driven and the controller node is event-driven, a Takagi-Sugeno (T-S) fuzzy model is used to approximate the nonlinear networked systems with delay. By means of Lyapunov functions, a method for designing a fuzzy state feedback controller to satisfy the prescribed H/sub /spl infin// performance index is proposed. The results are presented in terms of linear matrix inequalities (LMIs) which can be solved by LMI toolbox in Matlab 6.5. Finally, a numerical example is given to validate the proposed method.

Study of the Networked Control System with Long Delay

A class of networked control systems with long control and output delay is considered, the stage is used to fix the control delay, and an observer is designed to compensate the output delay, the model of the networked control system is given. Using the separate principle, the control design approach is given, and the design method of the observer is given with switched system theory and LMIs. The simulation result validates the method.

Fuzzy Robust H ∞ Control for Networked Control Systems

This paper is concerned with the robust Hinfin controller design of nonlinear networked control systems (NCSs). A Takagi-Sugeno (T-S) fuzzy model with parametrical uncertainties is used to approximate the NCS in which network-induced delay is time-vary and less than one sample period. In terms of the given model, a fuzzy controller design method is proposed based on Lyapunov approach and linear matrix inequality (LMI). A feedback gain of a memoryless controller can be obtained by solving a set of LMIs. An example is given to show the effectiveness of the proposed method

Observer design for MIMO networked control systems

The observer design is described for a class of MIMO networked control systems. Consider a MIMO networked control system within time-driven sensor nodes and controller node, the effect to the information transmission, which caused by network induced delay and data packet dropout, is analyzed firstly. And a observer is proposed to compensate the delay and packet dropout. Then based on separation theory, with the multi-Lyapunov functions and linear matrix inequality method, the sufficient condition on the asymmetric stability of the observer error system is given, together with the design approach of the gain matrix. Finally, a numerical example is given to validate the method.