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

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14.6. Decoupling

We have seen the problems with control-loop interaction; these occur because a manipulated input affects more than one controlled output. One approach to handling this problem is known as decoupling. The idea is to develop “synthetic” manipulated inputs that affect only one process output each. This approach is illustrated in Figure 14-9.

Figure 14-9. Decoupling control strategy—synthetic inputs and process outputs.

The relationship between the synthetic input vector and the process output vector is

Equation 14.21

For a two input–two ...

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