Design of Smith Predictor and Fuzzy Decoupling for Mimo Chemical Processes with Time Delays

2016 ◽  
Vol 19 (1) ◽  
pp. 57-66 ◽  
Author(s):  
M. Hamdy ◽  
A. Ramadan
Keyword(s):  
Time Delays ◽  
Chemical Processes ◽  
Smith Predictor

A Design Method for Modified Smith Predictors for Non-Minimum-Phase Time-Delay Plants with Multiple Feedback-Connected Time-Delays

2010 ◽  
Vol 36 ◽  
pp. 253-262 ◽  
Author(s):  
Iwanori Murakami ◽  
Nghia Thi Mai ◽  
Kou Yamada ◽  
Takaaki Hagiwara ◽  
Yoshinori Ando ◽  
...  
Keyword(s):  
Steady State ◽  
Time Delay ◽  
Time Delays ◽  
Large Time ◽  
Design Method ◽  
Smith Predictor ◽  
Minimum Phase ◽  
Effective Time ◽  
Phase Time ◽  
Step Disturbance

In this paper, we examine a design method for modified Smith predictors for non-minimum-phase time-delay plants with multiple feedback-connected time-delays. The Smith predictor is proposed by Smith to overcome time-delay and known as an effective time-delay compensator for a plant with large time-delay. The Smith predictor by Smith cannot be used for plants having an integral mode, because a step disturbance will result in a steady state error. Several papers considered the problem to design modified Smith predictors for unstable plants. However, no paper examines a design method for modified Smith predictors for non-minimum-phase time-delay plants with multiple feedback-connected time-delays. In this paper, we examine a design method for modified Smith predictors for non-minimum-phase time-delay plants with multiple feedback-connected time-delays.

On the filtered Smith predictor for MIMO processes with multiple time delays

2014 ◽  
Vol 24 (4) ◽  
pp. 383-400 ◽  
Author(s):  
Tito L.M. Santos ◽  
Rodolfo C.C. Flesch ◽  
Julio E. Normey-Rico
Keyword(s):  
Time Delays ◽  
Smith Predictor ◽  
Multiple Time ◽  
Multiple Time Delays

scholarly journals A Control Method to Balance the Efficiency and Reliability of a Time-Delayed Pump-Valve System

2016 ◽  
Vol 2016 ◽  
pp. 1-10 ◽  
Author(s):  
Zhounian Lai ◽  
Peng Wu ◽  
Shuai Yang ◽  
Dazhuan Wu
Keyword(s):  
Time Delays ◽  
Control Method ◽  
Sliding Mode ◽  
Mimo System ◽  
Smith Predictor ◽  
Free System ◽  
Pump Operation ◽  
Operation Conditions ◽  
Speed Regulation ◽  
Efficiency And Reliability

The efficiency and reliability of pumps are highly related to their operation conditions. The concept of the optimization pump operation conditions is to adjust the operation point of the pump to obtain higher reliability at the cost of lower system efficiency using a joint regulation of valve and frequency convertor. This paper realizes the control of the fluid conveying system based on the optimization results. The system is a nonlinear Multi-Input Multioutput (MIMO) system with time delays. In this paper, the time delays are separated from the system. The delay-free system is linearized using input-output linearization and controlled using a sliding mode method. A modified Smith predictor is used to compensate time delays of the system. The control strategy is validated to be effective on the test bench. The comparison of energy consumption and operation point deviation between conventional speed regulation and the new method is presented.

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