Assignment_4_2007_Solutions

1 2 3 4 findthecharacterist icequat ion

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Unformatted text preview: response and as discussed before wit h larger stabilit y margins. Figure 12: Bode diagram (showing stabilit y margins) with a PI controller using k c = 22.95 t I = 0 75 (ZN settings). ; . Figure 13: Bode diagram (showing stabilit y margins) with a PI controller using k c = 22.95 t I = 0 75 ; . Figure 14: Closed­loop response with a PI controller for a set­point change using k c = 17; I = 0 75 (Gain Margin settings). t . Figure 15. Closed­loop response with a PI controller for a disturbance using k c = 17; I = 0 75 (Gain margin settings) t . 3. For the heat­exchanger system in C­Station (Assignment 3, Exercise 5), we would like to implement a feedback control system using a PID controller by controlling the temperature with the cooling water as the manipulated variable. 1. 2. 3. 4. Find the characterist ic equat ion Find the ultimate controller gain ( k cu ) Design a PID controller using the Cohen and Coon and ZN tuning methods Analyze the closed­loop response against set­point and disturbances changes Solution...
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This note was uploaded on 01/12/2014 for the course CHE 4198 taught by Professor Hjortso,m during the Fall '08 term at LSU.

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