A Fast Algebraic Estimator for System Parameter Estimation and Online Controller Tuning—A Nanopositioning Application

Published on Jun 1, 2019in IEEE Transactions on Industrial Electronics7.515
· DOI :10.1109/TIE.2018.2863206
Andres San-Millan7
Estimated H-index: 7
(UCLM: University of Castilla–La Mancha),
Sumeet S. Aphale14
Estimated H-index: 14
(Aberd.: University of Aberdeen),
Vicente Feliu32
Estimated H-index: 32
(UCLM: University of Castilla–La Mancha)
Sources
Abstract
Parameter uncertainty is a key challenge in the real-time control of nanopositioners employed in scanning probe microscopy. Changes in the sample to be scanned introduces changes in system resonances, requiring instantaneous online tuning of controller parameters to ensure stable, optimal scanning performance. This paper presents a method based on the frequency-domain algebraic derivative approach for the accurate online identification of the nanopositioner's parameters. The parameter estimates are produced within a fraction of one period of the resonant mode frequency, allowing almost instantaneous tuning of controller parameters. Experimental results show that the proposed method can be utilized to automatically tune an integral resonant control scheme that combines both damping and tracking actions, and consequently deliver positioning performance far superior to that achieved solely due to the scheme's inherent robustness properties. It is further shown that the achieved performance compares favorably with an optimally designed control scheme of the same type.
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