Unformatted text preview: (g) Which approach from the list (a)-(c) prescribes the least aggressive ( i.e., most conservative) integral action for this process? Hint 1 . Cohen-Coon Design Relations for PI controller: K c = 1 K ! " 0.9 + 12 # $ % & ’ ( I = 30 + 3 "! ( ) 9 + 20 ( ) Hint 2 . Aggressive proportional action: higher K c . Aggressive integral action: lower ! I . 2.0 The open-loop step response y (t) of a process to an input u ( t ) is shown in the figure below. At time t = 0 sec, the input changed from a value 3 to a value 6. Calculate the PI controller settings that result from the following approaches: (a) Cohen-Coon tuning relations (b) ITAE performance index (load) (c) ITAE performance index (set point) 3.0 Exercise 12.5 (b) and (c)....
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This note was uploaded on 07/14/2011 for the course ECH 4323 taught by Professor Crissale during the Spring '10 term at University of Florida.
- Spring '10