Article | Proceedings of the 58th Conference on Simulation and Modelling (SIMS 58) Reykjavik, Iceland, September 25th ‚Äď 27th, 2017 | Modeling and simulation in the design process of a prosthetic foot
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Title:
Modeling and simulation in the design process of a prosthetic foot
Author:
Heimir Tryggvason: School of Engineering and Natural Sciences, University of Iceland, Iceland Felix Starker: School of Engineering and Natural Sciences, University of Iceland, Iceland Christophe Lecompte: School of Engineering and Natural Sciences, University of Iceland, Iceland Fjóla Jónsdóttir: School of Engineering and Natural Sciences, University of Iceland, Iceland
DOI:
10.3384/ecp17138398
Download:
Full text (pdf)
Year:
2017
Conference:
Proceedings of the 58th Conference on Simulation and Modelling (SIMS 58) Reykjavik, Iceland, September 25th ‚Äď 27th, 2017
Issue:
138
Article no.:
053
Pages:
398-405
No. of pages:
8
Publication type:
Abstract and Fulltext
Published:
2017-09-27
ISBN:
978-91-7685-417-4
Series:
Linköping Electronic Conference Proceedings
ISSN (print):
1650-3686
ISSN (online):
1650-3740
Publisher:
Linköping University Electronic Press, Linköpings universitet


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The design process of prosthetic feet largely depends on an iterative process of prototyping and user testing. As resources for reliable and repeatable user testing are limited, modeling and simulated testing of the design is a positive addition to this process to support further design development between prototyping. The key goal of prosthetic foot design is to mimic the function of the lost limb. A passive spring and damper system can imitate the behavior of an ankle for low level activity, e.g. walking at slow to normal speeds and relatively gentle ascents/descents. In light of this, a variety of constant stiffness prosthetic feet are available on the market that serve their users well. However, when walking at a faster pace and ascending/descending stairs, the function of the physiological ankle is more complex and the muscular activity contributes to the stride in different ways. One of the challenges in prosthetic device design is to achieve the appropriate range of stiffness of the arrangement of joints and spring elements for different tasks, as well as varying loading of the prosthetic device. This calls for an adaptive mechanism that mimics the stiffness characteristics of a physiological foot by applying real-time adaptive control that changes the stiffness reactively according to user’s needs. The goal of this paper is to define the stiffness characteristics of such a device through modeling. A finite element model was made for a well-received prosthetic foot design. The model was then validated by mechanical measurements of the actual product. We further enhanced the model to include a secondary spring/dampener element to provide added flexibility and damping of the ankle joint movement. Reactive control of the secondary element allows the simulated prosthetic foot to adapt the ankle joint to imitate the behavior of the physiological ankle during different activities and in different phases of the gait cycle.

Proceedings of the 58th Conference on Simulation and Modelling (SIMS 58) Reykjavik, Iceland, September 25th ‚Äď 27th, 2017

Author:
Heimir Tryggvason, Felix Starker, Christophe Lecompte, Fjóla Jónsdóttir
Title:
Modeling and simulation in the design process of a prosthetic foot
DOI:
http://dx.doi.org/10.3384/ecp17138398
References:
No references available

Proceedings of the 58th Conference on Simulation and Modelling (SIMS 58) Reykjavik, Iceland, September 25th ‚Äď 27th, 2017

Author:
Heimir Tryggvason, Felix Starker, Christophe Lecompte, Fjóla Jónsdóttir
Title:
Modeling and simulation in the design process of a prosthetic foot
DOI:
http://dx.doi.org/10.3384/ecp17138398
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Last updated: 2017-02-21