scholarly journals Study of adaptive Fuzzy Smith control for time-delay systems

2015 ◽  
Vol 18 (3) ◽  
pp. 143-149
Author(s):  
Tai Trong Nguyen ◽  
Thanh Van Dao
Keyword(s):  
Time Delay ◽  
Control Method ◽  
Fuzzy Controller ◽  
Smith Predictor ◽  
Delay Systems ◽  
Time Delay Systems ◽  
Control Effect ◽  
Performance Simulation ◽  
Adaptive Fuzzy ◽  
Varying Time Delay

In this paper, an adaptive Fuzzy Smith control method is presented to control the varying time delay systems. Based on the online parameter estimation, Smith predictor can be updated online which can eliminate the time delay element. This method overcame the shortcomings that control effect of conventional Smith predictor will be worse when the parameters of time delay systems change. Furthermore, an adaptive fuzzy controller adjusts online the PID control parameters to improve the control performance. Simulation results show the effectiveness of the proposed method.

ROBUST ADAPTIVE FUZZY CONTROLLER DESIGN FOR A CLASS OF UNCERTAIN NONLINEAR TIME-DELAY SYSTEMS

2011 ◽  
Vol 19 (02) ◽  
pp. 329-360 ◽  
Author(s):  
YAN-JUN LIU ◽  
RUI WANG ◽  
C. L. PHILIP CHEN
Keyword(s):  
Time Delay ◽  
Fuzzy Controller ◽  
Control Technique ◽  
Delay Systems ◽  
Design Parameters ◽  
Time Delay Systems ◽  
Dynamic Surface ◽  
Adaptive Fuzzy Controller ◽  
Adaptive Fuzzy ◽  
Approximation Errors

In this paper, the problems of stability and control for a class of uncertain nonlinear systems with unknown state time-delay are studied by using the fuzzy logic systems. Because the dynamic surface control technique is introduced to deal with the uncertain time-delay systems, the designed adaptive fuzzy controller can avoid the issue of "explosion of complexity", which comes from the traditional backstepping design procedure. Compared with the existing results in the literature, the robustness to the fuzzy approximation errors is improved by adjusting the estimations of the unknown bounds for the approximation errors. It is shown that the resulting closed-loop system is stable in the sense that all the signals are bounded and the system output track the reference signal in a small neighborhood of the origin by choosing design parameters appropriately. Three simulation examples are given to demonstrate the effectiveness of the proposed techniques.

Research of Nonlinear PID Control Method for Time Delay Systems

2010 ◽  
Vol 44-47 ◽  
pp. 3839-3843
Author(s):  
Wen Bo Liu ◽  
Meng Xiao Wang
Keyword(s):  
Time Delay ◽  
Pid Control ◽  
Control Method ◽  
Delay System ◽  
Smith Predictor ◽  
Delay Systems ◽  
Time Delay Systems ◽  
Nonlinear Controller ◽  
Time Delay System ◽  
Nonlinear Pid Control

A nonlinear PID control method based on Smith predictor is presented in this paper to control the time delay systems. This method combines the Smith predictor with nonlinear controller. And the simulation study had been done for a first-order time-delay system. The results show that this method offer good static and dynamic characteristics, at the same time its disturbance-rejection and robustness are better.

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