Control-relevant input excitation for system identification of ill-conditioned n × n systems with n > 2

Abstract The objective of this work is to generalize input excitation designs suggested for system identification of ill-conditioned 2 × 2 systems to cases with more than two inputs and outputs. The methods are evaluated using a four inputs-four outputs distillation column/stripper system as a case study. The performance of the various procedures is evaluated through the model fit and different plant-friendly indices. The obtained models, and thus the quality of the associated input excitations, are also evaluated through cross validations.

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