Output - error identification methods for partially known systems

Output-error methods are applied to the problem of identifying partially known linear time-invariant finite-dimensional svstems. The svstems considered have a limircd number of unknonn pariirncrcrs, whluh are assrlmcd to enter the nurncr;ltor and denominator of thr tr~nsfer f'unct~on rnulr~line~rl\. ' h l s is rcnrc>ctltativc o i mechanical and electrical systems with unknown ineitias, frictional coefficients, inductances or resistances. Two output-error schemes are developed and shown to be uniformly asymptotically convergent under certain conditions.