Controlling negative and positive power at the ankle with a soft exosuit

Sangjun Lee, Simona Crea, Philippe Malcolm, Ignacio Galiana, Alan Asbeck, Conor Walsh

Research output: Chapter in Book/Report/Conference proceedingConference contribution

31 Scopus citations

Abstract

The soft exosuit is a new approach for applying assistive forces over the wearer's body through load paths configured by the textile architecture. In this paper, we present a body-worn lower-extremity soft exosuit and a new control approach that can independently control the level of assistance that is provided during negative- and positive-power periods at the ankle. The exosuit was designed to create load paths assisting ankle plantarflexion and hip flexion, and the actuation system transmits forces from the motors to the suit via Bowden cables. A load cell and two gyro sensors per leg are used to measure real-time data, and the controller performs position control of the cable on a step-by-step basis with respect to the power delivered to the wearer's ankle by controlling two force parameters, the pretension and the active force. Human subjects testing results demonstrate that the controller is capable of modulating the amount of power delivered to the ankle joint. Also, significant reductions in metabolic rate (11%-15%) were observed, which indicates the potential of the proposed control approach to provide benefit to the wearer during walking.

Original languageEnglish (US)
Title of host publication2016 IEEE International Conference on Robotics and Automation, ICRA 2016
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages3509-3515
Number of pages7
ISBN (Electronic)9781467380263
DOIs
StatePublished - Jun 8 2016
Event2016 IEEE International Conference on Robotics and Automation, ICRA 2016 - Stockholm, Sweden
Duration: May 16 2016May 21 2016

Publication series

NameProceedings - IEEE International Conference on Robotics and Automation
Volume2016-June
ISSN (Print)1050-4729

Other

Other2016 IEEE International Conference on Robotics and Automation, ICRA 2016
CountrySweden
CityStockholm
Period5/16/165/21/16

ASJC Scopus subject areas

  • Software
  • Control and Systems Engineering
  • Artificial Intelligence
  • Electrical and Electronic Engineering

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    Lee, S., Crea, S., Malcolm, P., Galiana, I., Asbeck, A., & Walsh, C. (2016). Controlling negative and positive power at the ankle with a soft exosuit. In 2016 IEEE International Conference on Robotics and Automation, ICRA 2016 (pp. 3509-3515). [7487531] (Proceedings - IEEE International Conference on Robotics and Automation; Vol. 2016-June). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/ICRA.2016.7487531