Variable stiffness system based on rheology properties of shear thickening fluid

Heimir Tryggvason, Felix Starker, Christophe Lecomte, Fjola Jonsdottir

Rannsóknarafurð: Kafli í bók/skýrslu/ráðstefnuritiRáðstefnuframlagritrýni

1 Tilvitnun (Scopus)

Útdráttur

The unique rheological properties of discontinuous shear thickening fluids (STF) have been employed in various engineering applications in recent years. In a commercial aspect, this has most notably been body armor and protective equipment, but also specialized smart structures in damping and force-coupling applications. The topic of this work is the application of STF in a translational element for an articulating prosthetic foot. Connected in series and parallel to a spring system, the element can be used to affect the force transfer within the system and thereby influence the stiffness of the prosthetic foot dynamically over the gait cycle. The device described in this work is a STF filled piston/cylinder design. The objective is a velocity dependent force response over the translational motion. Ranging from dampened, compliant deflection at low velocity, to efficient force transfer (coupling) for energy storage and return in the spring system at higher speed. The rapid viscosity increase in the STF at a critical shear rate is used to produce a stepwise force response, thereby enabling adaptive response of the foot for different walking speeds and other various tasks, such as standing up from a seated position. The adaptive response results in a greater range of motion with easier rollover through stance phase for slow movement without sacrificing the energy return needed in faster walking.

Upprunalegt tungumálEnska
Titill gistiútgáfu9th ECCOMAS Thematic Conference on Smart Structures and Materials, SMART 2019
RitstjórarAyech Benjeddou, Nazih Mechbal, Jean-Francois Deu
ÚtgefandiInternational Center for Numerical Methods in Engineering
Síður1823-1833
Síðufjöldi11
ISBN-númer (rafrænt)9788494919466
ÚtgáfustaðaÚtgefið - 2019
Viðburður9th ECCOMAS Thematic Conference on Smart Structures and Materials, SMART 2019 - Paris, Frakkland
Tímalengd: 8 júl. 201911 júl. 2019

Ritröð

Nafn9th ECCOMAS Thematic Conference on Smart Structures and Materials, SMART 2019

Ráðstefna

Ráðstefna9th ECCOMAS Thematic Conference on Smart Structures and Materials, SMART 2019
Land/YfirráðasvæðiFrakkland
Borg/bærParis
Tímabil8/07/1911/07/19

Athugasemd

Publisher Copyright:
© 2019 9th ECCOMAS Thematic Conference on Smart Structures and Materials, SMART 2019. All rights reserved.

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