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Resonance Impedance Shaping Control of Hip Robotic Exoskeleton

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Published
  • Tao Xue
  • Ming Zhang
  • Jie Yin
  • Meng Zhang
  • Ou Bai
  • Ziwei Wang
  • Tao Zhang
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Publication date6/01/2022
Host publication2021 IEEE International Conference on Systems, Man, and Cybernetics (SMC)
PublisherIEEE
Pages888-893
Number of pages6
ISBN (Electronic)9781665442077
ISBN (Print)9781665442084
<mark>Original language</mark>English

Publication series

NameConference Proceedings - IEEE International Conference on Systems, Man and Cybernetics
ISSN (Print)1062-922X

Abstract

The hip assistance robotic exoskeleton has been demonstrated as an effective device to assist elderly and disabled people with gait disorders. The assistance efficiency of these devices, however, is less optimized because the parameters in the active impedance control are manually designated. This paper presented a novel assistance control scheme to address the sub-optimal issue. This study poses that the assistance efficiency can be maximized by modifying the mechanical impedance to resonate with the muscle driving force, in which the human-exoskeleton coupling system is approximated with a second-order dynamical system. Based on this, the exoskeleton virtual stiffness is adaptively tuned to make the system intrinsic frequency align with the intended swing frequency. The proposed assistance control scheme demonstrated an increased assistance efficiency than the conventional active impedance control in a simulated study. Experiments that were managed on a newly custom-made hip assistance robotic exoskeleton also demonstrated strong evidence of improved gait kinematics with decreased muscle-skeleton efforts.