Gain and Phase Margin for Multiloop LQG Regulators

Abstract

Multiloop linear-quadratic state-feedback (LQSF) regulators are shown to be robust against a variety of large dynamical linear time-invariant and memoryless nonlinear time-varying variations in open-loop dynamics. The results are interpreted in terms of the classical concepts of gain and phase margin, thus strengthening the link between classical and modern feedback theory. Copyright © 1977 by The Institute of Electrical and Electronics Engineers, Inc.