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Author Durfee, W. ♦ Jicheng Xia ♦ Hsiao-Wecksler, E.
Source IEEE Xplore Digital Library
Content type Text
Publisher Institute of Electrical and Electronics Engineers, Inc. (IEEE)
File Format PDF
Copyright Year ©2011
Language English
Subject Domain (in DDC) Technology ♦ Engineering & allied operations ♦ Other branches of engineering
Subject Keyword Pistons ♦ powered orthotics ♦ Actuators ♦ Fluids ♦ Power supplies ♦ Pumps ♦ Seals ♦ fluid power ♦ Orthotics
Abstract Untethered, powered orthotics require an actuation system with power supply and control, transmission line and actuator. Fluid power has unmatched force-to-weight and power-to-weight compared to electromechanical systems, but it is unclear if those same advantages hold for small systems in the 10 to 100 W range. A systems analysis approach suggests that a fluid power system will be lighter than an electromechanical system with the same output power and efficiency if the fluid power is run at pressures over about 200 psi. A theoretical analysis of small bore cylinders suggests that eliminating the piston seal will result in a higher efficiency actuator if the clearance gap is small. A demonstration, battery powered electrohydraulic actuator assembled from off-the-shelf components had the force and power suited to a powered ankle orthosis, but is too large and too heavy, suggesting the need to develop custom components.
Description Author affiliation: University of Minnesota, Minneapolis, USA (Durfee, W.; Jicheng Xia) || University of Illinois, Urbana-Champaign, USA (Hsiao-Wecksler, E.)
ISBN 9781424498635
ISSN 19457898
Educational Role Student ♦ Teacher
Age Range above 22 year
Educational Use Research ♦ Reading
Education Level UG and PG
Learning Resource Type Article
Publisher Date 2011-06-29
Publisher Place Switzerland
Rights Holder Institute of Electrical and Electronics Engineers, Inc. (IEEE)
e-ISBN 9781424498628
Size (in Bytes) 631.79 kB
Page Count 6
Starting Page 1
Ending Page 6


Source: IEEE Xplore Digital Library