What is it about?
It is well known that arbitrary pole-placement can be obtained when controllers of the same order as the plant to be controlled are used. For this reason, the blame for the failure of low-order adaptive controllers was put on the unmodeled dynamics. This paper reconsiders some well known examples to show that the previous conclusions were too pessimistic, and that low-order adaptive controllers are fit to control the given plants.
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This page is a summary of: Rohrs Examples and Robustness of Simple Adaptive Control, Journal of Dynamic Systems Measurement and Control, January 1991, ASME International, DOI: 10.1115/1.2896481.
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