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Volume 9 Issue 1
Jan.  2022

IEEE/CAA Journal of Automatica Sinica

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R. F. Wu, Z. K. Yao, J. Si, and H. Huang, “Robotic knee tracking control to mimic the intact human knee profile based on actor-critic reinforcement learning,” IEEE/CAA J. Autom. Sinica, vol. 9, no. 1, pp. 19–30, Jan. 2022. doi: 10.1109/JAS.2021.1004272
Citation: R. F. Wu, Z. K. Yao, J. Si, and H. Huang, “Robotic knee tracking control to mimic the intact human knee profile based on actor-critic reinforcement learning,” IEEE/CAA J. Autom. Sinica, vol. 9, no. 1, pp. 19–30, Jan. 2022. doi: 10.1109/JAS.2021.1004272

Robotic Knee Tracking Control to Mimic the Intact Human Knee Profile Based on Actor-Critic Reinforcement Learning

doi: 10.1109/JAS.2021.1004272
Funds:  This work was partly supported by the National Science Foundation (1563921, 1808752, 1563454, 1808898)
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  • We address a state-of-the-art reinforcement learning (RL) control approach to automatically configure robotic prosthesis impedance parameters to enable end-to-end, continuous locomotion intended for transfemoral amputee subjects. Specifically, our actor-critic based RL provides tracking control of a robotic knee prosthesis to mimic the intact knee profile. This is a significant advance from our previous RL based automatic tuning of prosthesis control parameters which have centered on regulation control with a designer prescribed robotic knee profile as the target. In addition to presenting the tracking control algorithm based on direct heuristic dynamic programming (dHDP), we provide a control performance guarantee including the case of constrained inputs. We show that our proposed tracking control possesses several important properties, such as weight convergence of the learning networks, Bellman (sub) optimality of the cost-to-go value function and control input, and practical stability of the human-robot system. We further provide a systematic simulation of the proposed tracking control using a realistic human-robot system simulator, the OpenSim, to emulate how the dHDP enables level ground walking, walking on different terrains and at different paces. These results show that our proposed dHDP based tracking control is not only theoretically suitable, but also practically useful.

     

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  • Ruofan Wu and Zhikai Yao contributed equally to this work.
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    Highlights

    • The first real-time tracking control of a wearable robotic prosthesis with human in the loop
    • Performance guarantees on learning convergence,solution optimality, practical stability
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    • Systematic performance evaluation of human-robot system during different walking tasks

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