NON-IDENTIFIER-BASED ADAPTIVE-CONTROL OF DYNAMIC-SYSTEMS - A SURVEY

In adaptive control, the objective is to provide a single controller (consisting of a feedback law and a parameter adaptation law) which can control each system belonging to a certain class of systems. The systems are not known precisely: only structural properties (e.g. minimality, minimum phase, known relative degree) are assumed to hold. The control objectives are stabilization, tracking or servomechanism action. The paper surveys those aspects of the field of adaptive control which started in the 1970s wherein no parameter estimators are used. In addition to universal adaptive controllers for finite dimensional minimum phase systems of relative degree 1, controllers for higher relative degree, non-minimum phase, infinite-dimensional, and nonlinear systems are also presented.