5.6. Effect of Tuning Parameters
We have shown how to use the closed-loop characteristic equation to determine the closed-loop stability of processes. Except for P-only control, we have not discussed the effect of controller tuning parameters on the feedback system performance (closed-loop response).
Our discussion here is based on open-loop stable processes. To better understand the effect of controller tuning parameters, you should experiment with a number of transfer functions. You can also determine the closed-loop poles as a function of the tuning parameters, for a particular process.
| kc | p1 | p2 | p3 |
|---|---|---|---|
| 0 | –1.0000 | –0.5000 | –0.3333 |
| 0.1000 | –1.0432 | –0.3951–0.1402j | –0.3951+0.1402j ... |
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