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Chapter 12

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Direct Synthesis ( G includes G m, G v ) 1. Specify closed-loop response (transfer function) 2. Need process model, (= G P G M G V ) 3. Solve for G c, Chapter 12 (12-3b)

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Specify Closed – Loop Transfer Function (first – order response, no offset) But other variations of (12-6) can be used (e.g., replace time delay with polynomial approximation) Chapter 12

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Derivation of PI Controller for FOPTD Process Consider the standard first-order-plus-time-delay model, Substituting and rearranging gives a PI controller, with the following controller settings: Chapter 12 Specify closed-loop response as FOPTD (12-6), but approximate

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Chapter 16 Time Delay Compensation Model-based feedback controller that improves closed-loop performance when time delays are present Effect of added time delay on PI controller performance for a second order process ( 1 = 3, 2 = 5) shown below

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Chapter 16

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No model error: (sensitive to model errors > +/- 20%) Chapter 16

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Direct Synthesis Approach (Smith Predictor) Assume time delay between set-point change and controlled variable (same as process time delay, ). If then From Block Diagram, Equating... Chapter 16

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