O'Reilly logo

Process Control: Modeling, Design, and Simulation by B. Wayne Bequette

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

9.4. IMC-Based Feedback Design for Processes with a Time Delay

In order to arrive at a PID equivalent form for processes with a time delay, we must make some approximation to the dead time. (Please note that we do not use an approximation for dead time when implementing the “pure” IMC strategy developed in Chapter 8. We are doing this only for the IMC-based PID procedure presented in this chapter; this is only done to yield a PID-type controller.) We use either a first-order Padé approximation for dead time or neglect dead time entirely and use the first-order transfer function results.

First-Order + Dead Time

Since first-order + dead time is the most common representation of chemical process dynamics, the PID equivalent form developed here is ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required