THE UNITARY INTERACTOR MATRIX AND ITS ESTIMATION USING CLOSED-LOOP DATA

This paper is concerned with the factorization and estimation of the u nitary interactor matrix or the time-delay matrix of multivariable sys tems. The important properties of the unitary interactor matrix for mi nimum variance control are discussed. An algorithm for factorization o f the unitary interactor matrix from the Markov parameters is introduc ed. A method for direct estimation of the interactor matrix from close d-loop data is proposed. The proposed algorithm is evaluated by applic ation to a simulated example, pilot-scale experiment and actual indust rial data. (C) 1997 Elsevier Science Ltd.