ROBUST STABILITY ANALYSIS OF TIME-DELAY SYSTEMS USING PARAMETER-PLANEAND PARAMETER-SPACE METHODS

in this paper, parameter-plane and parameter-space methods are applied for robust stability analysis of time-delay systems expressed by time -domain models. The relations among the parameters in time-domain matr ices and those in s-domain characteristic equations are analyzed. A ge neral rule for choosing the desirable;elements in matrices as paramete rs is proposed. The advantages of the methods are illustrated by examp les, and comparisons with two other methods in the current literature are made. (C) 1998 The Franklin Institute. Published by Elsevier Scien ce Ltd.