ON THE USE OF THE CONCEPT OF ROBUST STRICTLY POSITIVE REALNESS IN REDUCED ORDER ADAPTIVE CONTROL

摘要

In this work, we consider uncertain LTI SISO systems whose uncertainty is expressed in terms of frequency inequality. This latter is related to the concept of robust strictly positive real transfer function introduced in this paper. By suitably combining this concept with that of almost strictly positive reamess, it is possible to define an approximate pole assignment objective and design a reduced order adaptive control scheme characterized by a globally asymptotically stable behaviour of the output error, internal stability and boundedness of the controller parameters.