A METHOD FOR ADAPTIVE-CONTROL OF NONMINIMUM-PHASE CONTINUOUS-TIME SYSTEMS BASED ON POLE-ZERO PLACEMENT

We present a new method for the adaptive control of nonminimum phase c ontinuous-time systems based on the pole-zero placement using approxim ate inverse systems to avoid the unstable pole-zero cancellations. Usi ng this method effect of the unstable zeros can be compensated approxi mately. We show how unstable pole-zero cancellations can be avoided, a nd that this method has the advantage of being able to determine an ap proximate inverse system independently of the plant zeros. The propose d scheme uses only the available input and output data and the stabili ty using approximate inverse systems is analyzed. Finally the results of computer simulation are presented to illustrate the effectiveness o f the proposed method.