Enhanced Modified Smith Predictor for Delay Dominated Unstable Processes

2018 ◽  
Author(s):  
Somak Karan ◽  
Chanchal Dey
Keyword(s):  
Smith Predictor ◽  
Modified Smith Predictor ◽  
Unstable Processes

scholarly journals Smith predictor based sliding mode control for a class of unstable processes

2015 ◽  
Vol 39 (5) ◽  
pp. 706-714 ◽  
Author(s):  
Utkal Mehta ◽  
Rubén Rojas
Keyword(s):  
Sliding Mode Control ◽  
Sliding Mode ◽  
Search Algorithm ◽  
Design Method ◽  
Smith Predictor ◽  
Control Input ◽  
Mode Control ◽  
Modified Smith Predictor ◽  
Unstable Process ◽  
Unstable Processes

A strategy to regulate unstable processes using a modified Smith predictor based sliding mode controller (SP-SMC) is illustrated. The proposed scheme presents disturbance rejection and optimal control input usage with overall improved regulatory performances. The unstable process with time delay is first estimated using a simple measurement of limit cycle output obtained from a modified relay experiment. Then this paper extends a work on SP-SMC for unstable processes, which leads to significant improvements in its regulatory capacities of reference inputs and disturbances. A new control law is incorporated in the discontinuous part of sliding mode control such that the overall performance improves significantly. The metaheuristic search algorithm with some modifications has been implemented successfully to satisfy the new control performance index. The robustness of the controller is also tested under the process uncertainty. Illustrative examples show the simplicity and superiority of the presented design method over previously published approaches.

A Modified Smith Predictor with a New Structure for Unstable Processes

1999 ◽  
Vol 38 (2) ◽  
pp. 405-411 ◽  
Author(s):  
Hee Jin Kwak ◽  
Su Whan Sung ◽  
In-Beum Lee ◽  
Jin Yong Park
Keyword(s):  
Smith Predictor ◽  
Modified Smith Predictor ◽  
Unstable Processes
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