The RGA as a Measure of Process Sensitivity to Uncertainty

Thus far, the RGA has been used to measure the process interactions and to aid in selecting the pairings for decentralized controller configurations. It is noteworthy that the magnitudes of the RGA elements are an indication of the degree of the process sensitivity to uncertainty. This is illustrated using a hypothetical process model. 

In summary, processes with RGA coefficients close to unity are relatively insensitive to uncertainties in the process model. Conversely, processes with large RGA coefficients tend to exhibit a high degree of sensitivity to model uncertainties. 

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