DIGITAL MODELING AND ROBUST DIGITAL REDESIGN OF SAMPLED-DATA UNCERTAIN SYSTEM WITH INPUT TIME-DELAY

Using the bilinear and tuning bilinear approximation together with the interval arithmetic operation, the discrete-time uncertain model and robust digital redesign of sampled-data uncertain system with input ti me delay are presented. The system matrices characterizing the state-s pace representation of the original uncertain system are assumed to be interval matrices. The develop discrete-time interval model tightly e ncloses the exactly discretized continuous-time input time-delay uncer tain system, and it can be utilized for digital simulation. Based on b ilinear approximation, a tuning bilinear approximation is presented to find the digitally redesign controller of the digitally controlled sa mpled-data uncertain system with input time delay. The digitally redes igned predictor controller is able to closely match the states of the digitally redesigned uncertain sampled-data system with those of the o riginal continuous-time predictor controlled uncertain system.