KING FAHD UNIVERSITY CHEMICAL ENGINEERING COURSE NOTES (Process Control)-Lec32

KING FAHD UNIVERSITY CHEMICAL ENGINEERING COURSE NOTES (Process Control)-Lec32

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Unformatted text preview: 1 Chapter 12 1. > 0.8 and (Rivera et al., 1986) 2. (Chien and Fruehauf, 1990) 3. (Skogestad, 2003) / c 0.1 c c c = Controller Tuning Relations In the last section, we have seen that model-based design methods such as DS and IMC produce PI or PID controllers for certain classes of process models. IMC Tuning Relations The IMC method can be used to derive PID controller settings for a variety of transfer function models. Several IMC guidelines for have been published for the model in Eq. 12-10: c 2 Chapter 12 Table 12.1 IMC-Based PID Controller Settings for G c ( s ) (Chien and Fruehauf, 1990). See the text for the rest of this table. 3 Chapter 12 4 Chapter 12 Tuning for Lag-Dominant Models First- or second-order models with relatively small time delays are referred to as lag-dominant models . The IMC and DS methods provide satisfactory set-point responses, but very slow disturbance responses, because the value of is very large. Fortunately, this problem can be solved in three different ways. Method 1: Integrator Approximation I ( 29 / 1 = * Approximate ( ) by ( ) 1 where * / ....
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KING FAHD UNIVERSITY CHEMICAL ENGINEERING COURSE NOTES (Process Control)-Lec32

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