Energy efficiency analysis and design optimization of an actuation system in a soft modular lower limb exoskeleton

Ortiz, Jesus; Poliero, Tommaso; Cairoli, Giovanni; Graf, Eveline; Caldwell, Darwin G.

doi:10.21256/zhaw-1365

Please use this identifier to cite or link to this item: https://doi.org/10.21256/zhaw-1365

Publication type:	Article in scientific journal
Type of review:	Peer review (publication)
Title:	Energy efficiency analysis and design optimization of an actuation system in a soft modular lower limb exoskeleton
Authors:	Ortiz, Jesus Poliero, Tommaso Cairoli, Giovanni Graf, Eveline Caldwell, Darwin G.
DOI:	10.21256/zhaw-1365 10.1109/LRA.2017.2768119
Published in:	IEEE Robotics and Automation Letters
Volume(Issue):	3
Issue:	1
Page(s):	484
Pages to:	491
Issue Date:	2018
Publisher / Ed. Institution:	IEEE
ISSN:	2377-3766
Language:	English
Subjects:	Prosthetics and exoskeletons; Wearable robots; Mechanism design
Subject (DDC):	600: Technology 620: Engineering
Abstract:	One of the critical aspects in the design of an assistive wearable robot is the energy efficiency of the actuation system, since it affects significantly the weight and consequently the comfort of the system. Several strategies have been used in previous research, mostly based on energy harvesting, compliant elements for mechanical energy accumulation (springs or elastic cords), ratchets and clutches. However, the design of the optimal actuator arrangement is highly dependent on the task, which increases significantly the complexity of the design process. In this work we present an energy efficiency analysis and design optimization of an actuation system applied to a soft module lower limb exoskeleton. Instead of performing a comparison between predefined mechanism arrangements, we solve a full optimization problem which includes not only the mechanism parameters, but also the mechanism architecture itself. The optimization is performed for a walking task using gait data from a stroke subject, and the result is a set of actuator Arrangements with optimal parameters for the analyzed task and selected user. The optimized mechanism is able to reduce the energy requirements by 20-65%, depending of the joint. The proposed mechanism is currently under development within the XoSoft EU project, a modular soft lower-limb exoskeleton to assist People with mobility impairments.
URI:	https://digitalcollection.zhaw.ch/handle/11475/1426
Fulltext version:	Submitted version
License (according to publishing contract):	Licence according to publishing contract
Departement:	School of Health Sciences
Organisational Unit:	Institute of Physiotherapy (IPT)
Appears in collections:	Publikationen Gesundheit

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Ortiz, J., Poliero, T., Cairoli, G., Graf, E., & Caldwell, D. G. (2018). Energy efficiency analysis and design optimization of an actuation system in a soft modular lower limb exoskeleton. IEEE Robotics and Automation Letters, 3(1), 484–491. https://doi.org/10.21256/zhaw-1365

Ortiz, J. et al. (2018) ‘Energy efficiency analysis and design optimization of an actuation system in a soft modular lower limb exoskeleton’, IEEE Robotics and Automation Letters, 3(1), pp. 484–491. Available at: https://doi.org/10.21256/zhaw-1365.

J. Ortiz, T. Poliero, G. Cairoli, E. Graf, and D. G. Caldwell, “Energy efficiency analysis and design optimization of an actuation system in a soft modular lower limb exoskeleton,” IEEE Robotics and Automation Letters, vol. 3, no. 1, pp. 484–491, 2018, doi: 10.21256/zhaw-1365.

ORTIZ, Jesus, Tommaso POLIERO, Giovanni CAIROLI, Eveline GRAF und Darwin G. CALDWELL, 2018. Energy efficiency analysis and design optimization of an actuation system in a soft modular lower limb exoskeleton. IEEE Robotics and Automation Letters. 2018. Bd. 3, Nr. 1, S. 484–491. DOI 10.21256/zhaw-1365

Ortiz, Jesus, Tommaso Poliero, Giovanni Cairoli, Eveline Graf, and Darwin G. Caldwell. 2018. “Energy Efficiency Analysis and Design Optimization of an Actuation System in a Soft Modular Lower Limb Exoskeleton.” IEEE Robotics and Automation Letters 3 (1): 484–91. https://doi.org/10.21256/zhaw-1365.

Ortiz, Jesus, et al. “Energy Efficiency Analysis and Design Optimization of an Actuation System in a Soft Modular Lower Limb Exoskeleton.” IEEE Robotics and Automation Letters, vol. 3, no. 1, 2018, pp. 484–91, https://doi.org/10.21256/zhaw-1365.