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A simple approach to estimate muscle forces and orthosis actuation in powered assisted walking of spinal cord-injured subjects

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10.1007/s11044-011-9284-5
 
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hdl:2117/26887

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Alonso Sánchez, Javier
Romero Sánchez, Francisco
Pàmies Vilà, RosaMés informacióMés informacióMés informació
Lugrís Armesto, Urbano
Font Llagunes, Josep MariaMés informacióMés informacióMés informació
Document typeArticle
Defense date2012-08-01
Rights accessRestricted access - publisher's policy
Attribution-NonCommercial-NoDerivs 3.0 Spain
Except where otherwise noted, content on this work is licensed under a Creative Commons license : Attribution-NonCommercial-NoDerivs 3.0 Spain
Abstract
Simulation of walking in individuals with incomplete spinal cord injuries (SCI) wearing an active orthosis is a challenging problem from both the analytical and the computational points of view, due to the redundant nature of the simultaneous actuation of the two systems. The objective of this work is to quantify the contributions of muscles and active orthosis to the net joint torques, so as to assist the design of active orthoses for SCI. The functional innervated muscles of SCI patients were modeled as Hill-type actuators, while the idle muscles were represented by elastic and dissipative elements. The orthosis was included as a set of external torques added to the ankles, knees, and hips to obtain net joint torque patterns similar to those of normal unassisted walking. The muscle-orthosis redundant actuator problem was solved through a physiological static optimization approach, for which several cost functions and various sets of innervated muscles were compared.
CitationAlonso, J. [et al.]. A simple approach to estimate muscle forces and orthosis actuation in powered assisted walking of spinal cord-injured subjects. "Multibody system dynamics", 01 Agost 2012, vol. 28, núm. 1-2, p. 109-124. 
URIhttp://hdl.handle.net/2117/26887
DOI10.1007/s11044-011-9284-5
ISSN1384-5640
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  • Departament d'Enginyeria mecànica - Articles de revista [486]
  • BIOMEC - Biomechanical Engineering Lab - Articles de revista [25]
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