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Output-based Adaptive Iterative Learning Control of Uncertain Linear Systems Applied to a Wafer Stage

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Abstract

Iterative learning control (ILC) is an efficient technique applicable to improving the tracking performance of systems that have a repetitive nature. In this paper, point-to-point movements with time-iteration-varying disturbances are considered instead. A new output-based adaptive ILC scheme consisting of an adaptive second-order ILC and an iterative learning estimation of time-iteration-varying disturbances is proposed for a class of linear systems with unknown parameters. The proposed algorithm is used to improve trajectory tracking performance without requiring a plant model or a sensitivity function, and without assuming the initial condition to be zero. In order to verify the proposed algorithm, it is applied to a wafer stage, and the obtained tracking performance is compared with that obtained using a traditional second-order ILC algorithm; better results are obtained using the proposed method.

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Correspondence to Mingsheng Cao.

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Mingsheng Cao received his B.S. degree in Changchun University of Science and Technology in 2013. He is currently pursuing a Ph.D. degree in mechanical engineering in Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences. His research interests include iterative learning control, sliding-model control and robust control.

Yumeng Bo received her B.S. degree in University of Science and Technology of China in 2017. She is currently pursuing an M.S. degree in mechanical engineering in Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences. Her research interests include iterative learning control, adaptive control and precision motion control.

Huibin Gao received his B.S. degree in Jilin University in 1985. He received an M.S. degree in Jilin University in 1990. He is currently a researcher in Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences. His research interests include iterative learning control, photoelectric tracking and precision motion control.

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Cao, M., Bo, Y. & Gao, H. Output-based Adaptive Iterative Learning Control of Uncertain Linear Systems Applied to a Wafer Stage. Int. J. Control Autom. Syst. 20, 741–749 (2022). https://doi.org/10.1007/s12555-020-0564-9

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