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Volume 11 Issue 1
Jan.  2024

IEEE/CAA Journal of Automatica Sinica

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Z. Zhang, H. Jiang, D. Shen, and S. Saab, “Data-driven learning control algorithms for unachievable tracking problems,” IEEE/CAA J. Autom. Sinica, vol. 11, no. 1, pp. 205–218, Jan. 2024. doi: 10.1109/JAS.2023.123756
Citation: Z. Zhang, H. Jiang, D. Shen, and S. Saab, “Data-driven learning control algorithms for unachievable tracking problems,” IEEE/CAA J. Autom. Sinica, vol. 11, no. 1, pp. 205–218, Jan. 2024. doi: 10.1109/JAS.2023.123756

Data-Driven Learning Control Algorithms for Unachievable Tracking Problems

doi: 10.1109/JAS.2023.123756
Funds:  This work was supported by the National Natural Science Foundation of China (62173333, 12271522), Beijing Natural Science Foundation (Z210002), and the Research Fund of Renmin University of China (2021030187)
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  • For unachievable tracking problems, where the system output cannot precisely track a given reference, achieving the best possible approximation for the reference trajectory becomes the objective. This study aims to investigate solutions using the P-type learning control scheme. Initially, we demonstrate the necessity of gradient information for achieving the best approximation. Subsequently, we propose an input-output-driven learning gain design to handle the imprecise gradients of a class of uncertain systems. However, it is discovered that the desired performance may not be attainable when faced with incomplete information. To address this issue, an extended iterative learning control scheme is introduced. In this scheme, the tracking errors are modified through output data sampling, which incorporates low-memory footprints and offers flexibility in learning gain design. The input sequence is shown to converge towards the desired input, resulting in an output that is closest to the given reference in the least square sense. Numerical simulations are provided to validate the theoretical findings.

     

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    Highlights

    • characterize the concept of the unachievable tracking problem
    • demonstrate the necessity of gradient information in achieving the control objective
    • Introduce a design for an input-output-driven learning gain matrix
    • Identify the gradient drift problem arising from incomplete data
    • Propose an extended ILC scheme incorporating an error compensation mechanism

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