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Error-Tracking Iterative Learning Control for the Constrained Flexible-Joint Manipulator with Initial Errors

Author

Listed:
  • Huihui Shi

    (Data-Driven Intelligent Systems Laboratory, College of Information Engineering, Zhejiang University of Technology, Hangzhou 310023, China)

  • Qiang Chen

    (Data-Driven Intelligent Systems Laboratory, College of Information Engineering, Zhejiang University of Technology, Hangzhou 310023, China)

Abstract

The use of manipulators can improve sustainable energy utilization efficiency and increase sustainable manufacturing practices for solar tracking systems and manufactures, and thus it is significant to guarantee a high tracking accuracy for manipulators. In this paper, an error-tracking adaptive iterative learning control (AILC) method is proposed for a constrained flexible-joint manipulator (FJM) with initial errors. Due to the existence of the repeated positioning drift, the accuracy of the actual manipulator and the sustainable energy utilization efficiency are affected, which motivates the error-tracking approach proposed in this paper to deal with the repeat positioning problem. The desired error trajectory is constructed, such that the tracking error can follow the desired error trajectory without arbitrary initial values and iteration-varying tasks. Then, the system uncertainties are approximated by the capability of fuzzy logic systems (FLSs), and the combined adaptive laws are designed to update the weight and the approximating error of FLSs. Considering the safety operation of the flexible-joint manipulator, both input and output constraints are considered, a quadratic-fractional barrier Lyapunov function (QFBLF) is constructed, such that the system output is always within the constrained region. Therefore, the proposed method can guarantee the output tracking accuracy of manipulators under arbitrary initial values and iteration-varying tasks and keep the system output within the constraints to improve the transient performance, such that the energy utilization and accessory manufacturing efficiency can be improved. Through the Lyapunov synthesis, it is proved that the tracking error can converge to zero as the number of iterations goes to infinity. Finally, comparative simulations are carried out to verify the effectiveness of the proposed method.

Suggested Citation

  • Huihui Shi & Qiang Chen, 2022. "Error-Tracking Iterative Learning Control for the Constrained Flexible-Joint Manipulator with Initial Errors," Sustainability, MDPI, vol. 14(19), pages 1-21, September.
    • Handle: RePEc:gam:jsusta:v:14:y:2022:i:19:p:12453-:d:929929
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    References listed on IDEAS

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    1. Mohammad Reza Khosravani & Azadeh Haghighi, 2022. "Large-Scale Automated Additive Construction: Overview, Robotic Solutions, Sustainability, and Future Prospect," Sustainability, MDPI, vol. 14(15), pages 1-30, August.
    2. Rabab Benotsmane & László Dudás & György Kovács, 2021. "Newly Elaborated Hybrid Algorithm for Optimization of Robot Arm’s Trajectory in Order to Increase Efficiency and Provide Sustainability in Production," Sustainability, MDPI, vol. 13(15), pages 1-23, July.
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    Cited by:

    1. Xiaoqing Bai & Chun Wei & Peijie Li & Dongliang Xiao, 2023. "Editorial for the Special Issue on Sustainable Power Systems and Optimization," Sustainability, MDPI, vol. 15(6), pages 1-3, March.

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