Robust stability of multi‐loop continuous time self‐tuning controllers

Abstract

The results of an earlier paper concerning global robustness of single‐loop self‐tuning controllers are extended to include multiple self‐tuning controllers operating in a multiple‐interacting‐loop environment. The robust stability is shown to depend on the singular value loci of a certain transfer function matrix. The need for control weighting to ensure global robust stability is emphasized. Copyright © 1990 John Wiley & Sons, Ltd.