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 is that although it contains five parameters, only three are adjusted by the operator namely the gain ,the Integral time and the deadtime. 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.                                                                         

Biographies:

	G.Saravanakumar, is presently with the department of Instrumentation and control Engineering, MIT, Manipal, India. He completed his master’s degree in 2002.Presently he is a research scholar pursuing his work in the field of Adaptive control. He has published many papers in both national and International conferences. His research areas and field of Interests include control system, process control and adaptive control etc
	R.S.D.Wahidabanu, is presently a professor with the department of Computer science and Engineering, GCE, Salem, India. She completed her PhD from Anna university, Chennai during 1994.Her research area of Interests include Artificial Intelligence, Computer protocols etc.12 students are being guided by her for doing PhD. She is a member of several Technical societies. She had published many papers in International conferences and Indian Journals.
	George, is presently a professor with the Department of Instrumentation and control Engineering, MIT, Manipal, India. He completed his PhD during 2004 from NIT,Trichy. His Research area of Interests include Aerospace Engineering, Navigation and control, Control and Instrumentation,etc.He has Published many papers in National/International journals and conferences.

BibTex:

@ARTICLE{P1110626006,

AUTHOR = {G.Saravanakumar and R.S.D.WahidhaBanu and V.I.George },

TITLE = {Robustness and performance of modified smith predictors for Processes with longer dead-times},

JOURNAL = {ICGST International Journal on Automatic Control and Systems Engineering, ACSE},

YEAR = {2006},

VOLUME = {06},

ISSUE = {III},

PAGES = {41--46}

}

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