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Nonlinear Dynamics

, Volume 79, Issue 2, pp 1099–1114 | Cite as

RETRACTED ARTICLE: Cascade controller design and stability analysis in FES-aided upper arm stroke rehabilitation robotic system

  • Wenkang Xu
  • Chenxiao CaiEmail author
  • Yun Zou
Original Paper

Abstract

A three-dimensional stroke rehabilitation system is studied which combines the functional electrical stimulation (FES) with a robotic support to provide assistance to stroke patients who are required to perform upper extremity trajectory-tracking exercises with their residual voluntary efforts. When not enough voluntary efforts can be supplied, FES-based assistance is provided by applying electrical stimulation to the actuated muscles. In order to realize more rapid and accurate control of trajectory tracking, a new cascade control scheme is developed for the combined muscle and supported arm system. The stability of the cascade-controlled system and the internal stability of the unactuated dynamics are rigorously studied. The parameter optimal iterative learning control is then employed to further improve the trajectory-tracking accuracy of the cascade-based robotic system. Performance evaluation results confirm the effectiveness of the proposed method for upper arm trajectory-tracking-oriented stroke rehabilitation.

Keywords

Cascade control Iterative learning control Stroke rehabilitation Exoskeleton robot Internal stability 

Notes

Acknowledgments

The authors are grateful to the handling editor and reviewers for their valuable comments and suggestions. Prof. Eric Rogers, Dr. Chu Bing and Dr. Christopher Freeman at University of Southampton are highly appreciated for their stimulating discussions and judicious suggestions.

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Copyright information

© Springer Science+Business Media Dordrecht 2014

Authors and Affiliations

  1. 1.School of AutomationNanjing University of Science and TechnologyNanjing China

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