Performance analysis of various Smith predictors for integrating processes with longer dead-time. (18th May 2009)

• Record Type: Journal Article
• Authors: Saravanakumar, G.; Wahidabanu, R.S.D.; Nayak, C.G.
• Is Part Of: International journal of automation and control. Volume 3:Number 2/3(2009)
• Page Start: 248
• Page End: 263
• Publication Date: 2009-05-18
• Subjects: integrating processes -- Smith predictors -- dead time compensating control -- tuning -- disturbance -- performance evaluation; Automation -- Periodicals; Control theory -- Periodicals; Automatic control -- Periodicals; Robots -- Periodicals; Bionics -- Periodicals; Intelligent control systems -- Periodicals
• Languages: English
• ISSNs: 1740-7516

Abstract

Processes that contain a large transport lag[exp (?τDS)] can be difficult to control because a disturbance in set point or load does not reach the output of the process until τD units of time have elapsed. The control strategy known as dead-time compensating controller is also referred to as a Smith predictor. The control algorithm in a Smith predictor is normally a PI controller. This paper describes the advantage of modified Smith predictors which has the advantage over the dead-time compensating controllers. Although it contains five parameters, only three are adjusted by the operator namely the gain, the integral time and the dead-time. The controller is also suited for processes with varying longer dead-times and can be tuned manually in the same way as a PID controller and has the advantage over the other Smith predictor based controllers.