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The problem of obtaining linear models for effective control is discussed. First a good model structure is identified by comparing different models. It is demonstrated that the high-frequency behavior (initial time response) of the model is much more important for controller design than the steady-state characteristics. Finally, having determined a good model structure, the problem of obtaining models...
The paper reviews existing and presents some new results for the frequency-dependent RGA. It is shown how frequency-dependent plots of the relative gains, ??, and the closed-loop disturbance gains, ??, can be used to evaluate the achievable performance (controllability) of a plant under decentralized control. These controller-independent measures give constraints on the design of the individual loops.
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