In the pursue of providing high quality output regulation and the minimization of energy costs for industrial plants, it has become important to develop high perfomance servomechanism contrellers. Under nominal operating conditions, such controllers are generally found to be satisfactory However, severe limitations in performance in such systems often occur when large unanticipated structural controllers which have this property as being `intelligent'. This paper gives an overview of a class of intelligent servomechanism controllers which is based on the results of [Miller, Davison (1989)], [Chang, Davison (1994a)] (Sec. 7.3). These controllers contain a switching device which applies a sequence of LTI controllers to the system, and which after a finite time (i.e. `learning time'), switching ceases, resulting in the system being controlled by a LTI controller; the parameters of this LTI controller can then be adjusted by on-line tuning to minimize a performance index for the system.
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