CLCR optimal input design for IS and IU plants

The paper deals with the optimal reference signal excitation for closed‐loop‐control‐relevant (CLCR) identification for inverse stable (IS) and inverse unstable (IU) processes. For the IS case the optimal excitation depends only on the performance design goal, however, for the IU case it depends on the invariant factors of the plant, so only learning algorithms can be applied.