DISTURBANCE DECOUPLING FOR TIME-DELAY SYSTEMS

In this paper the disturbance decoupling problem associated with a cla ss of linear and nonlinear time delay systems is considered. The solut ion to this problem is given in terms of the relative degrees associat ed with the input and the disturbance of the corresponding time delay systems. A stability study using some results due to Pontryagin is pre sented for the resultant closed-loop system when the delay system is l inear. Also, an approximate causal solution is proposed for the nonlin ear time delay system based on its linearization around an equilibrium point. (C) 1997 by John Wiley & Sons, Ltd.