Assessing neuromuscular mechanisms in human-exoskeleton interaction. Sylla, N., Bonnet, V., Venture, G., Armande, N., & Fraisse, P. In Proceedings of the International Conference of the IEEE Engineering in Medicine and Biology Society, pages 1210--1213, 2014.
doi  abstract   bibtex   
In this study, we propose to evaluate a 7 DOF exoskeleton in terms of motion control. Using criteria from the human motor control literature, inverse optimization was performed to assess an industrial screwing movement. The results of our study show that the hybrid composition of the free arm movement was accurately determined. At contrary, when wearing the exoskeleton, which produces an arbitrary determined torque compensation, the motion is different from the naturally adopted one. This study is part of the evaluation and comprehension of the complex neuromuscular mechanism resulting in wearing an exoskeleton several hours per day for industrial tasks assistance.
@InProceedings{Sylla2014_EMBC,
  Title                    = {Assessing neuromuscular mechanisms in human-exoskeleton interaction},
  Author                   = {Sylla, N. and Bonnet, V. and Venture, G. and Armande, N. and Fraisse, P.},
  Booktitle                = {Proceedings of the International Conference of the IEEE Engineering in Medicine and Biology Society},
  Year                     = {2014},
  Pages                    = {1210--1213},

  Abstract                 = {In this study, we propose to evaluate a 7 DOF exoskeleton in terms of motion control. Using criteria from the human motor control literature, inverse optimization was performed to assess an industrial screwing movement. The results of our study show that the hybrid composition of the free arm movement was accurately determined. At contrary, when wearing the exoskeleton, which produces an arbitrary determined torque compensation, the motion is different from the naturally adopted one. This study is part of the evaluation and comprehension of the complex neuromuscular mechanism resulting in wearing an exoskeleton several hours per day for industrial tasks assistance.},
  Doi                      = {10.1109/EMBC.2014.6943814},
  ISSN                     = {1557-170X},
  Keywords                 = {biomechanics;industrial control;motion control;muscle;neurophysiology;optimisation;orthotics;torque;7 DOF exoskeleton evaluation;arbitrary torque compensation determination;complex neuromuscular mechanism comprehension;complex neuromuscular mechanism evaluation;exoskeleton wearing;human motor control literature criteria;human-exoskeleton interaction;hybrid free arm movement composition determination;industrial screwing movement assessment;industrial tasks assistance;inverse optimization;motion control;neuromuscular mechanism assessment;Cost function;Exoskeletons;Joints;Neuromuscular;Torque;Trajectory},
  Review                   = {Human movement trajectory planning have several degrees of redundency, and any cost functions used to model trajectory plannning could be attempting to minimize jerk, torque change, energy, or variance. However, no consensus has been met, as the weight of each criteria appear to change from task to task. Hybrid cost functions have been proposed, with either used overly simple cost functions or simple motions.

This paper fit an exoskel over 8 subjects performing car assembly plant motions, and collected joint angles and torque via the exoskel. The paper saw that geodescic (a function of joint velo) was the most influencial cost variable, from a list of 6 common cost functions, but it varied greatly from trial to trial (exo vs no exo, and varying weights lifted). However, this may be due to the exoskel constraining movement, and the subject adjusting to the existance of the exo.},
  Timestamp                = {2015.06.26}
}

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