Controller Tuning

In Chapter 1 we suggested a control system structure in which most control loops are divided into three classes: (1) material balance, (2) product quality, and (3) constraints. If we look at these loops from the standpoint of classical, single-loop theory, we see that the material-balance loops function as low-pass filters (slow dynamics) while the product-quality loops function as bandpass or high-pass filters (faster dynamics).

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