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

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10.1. Background

Thus far in this textbook we have emphasized control-system design for single input–single output (SISO) processes; that is, processes with one output (measured) variable and one manipulated variable. We have also focused on setpoint responses, primarily because it is then easier to tune a feedback controller. In particular, it is easier to tune on-line for setpoint changes because we do not know when a disturbance is going to enter a system. We have developed a number of control-system design procedures that are based on a desired response to a setpoint change.

In practice, disturbance rejection is very important. The primary disadvantage to feedback-only control is that a disturbance must be “felt” by the output variable before ...

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