Special Section Technical Briefs

Peak Force Measurements for a Combustion-Driven, Direct-Conversion, Actuation System for Powered Orthoses1

[+] Author and Article Information
Douglas L. Cook

Applied Technology Center—RP Research,
Milwaukee School of Engineering,
Milwaukee, WI 53202

Accepted and presented at The Design of Medical Devices Conference (DMD2015), April 13-16, 2015, Minneapolis, MN, USA.

Manuscript received March 3, 2015; final manuscript received March 17, 2015; published online April 24, 2015. Editor: Arthur Erdman.

J. Med. Devices 9(2), 020944 (Jun 01, 2015) (3 pages) Paper No: MED-15-1137; doi: 10.1115/1.4030149 History: Received March 03, 2015; Revised March 17, 2015; Online April 24, 2015

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Fig. 1

Comparison of actuator technologies’ mass-to-power ratios over varying run times. Adapted from Ref. [4].

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Fig. 2

Ankle torque and power versus time, for a healthy 85 kg person. Adapted from Ref. [5].

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Fig. 3

Conceptual design of the combustion-based, direct-conversion, pneumatic, and actuation system for a powered orthosis (patent pending [7])

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Fig. 4

Combustion-force test stand for a modified pneumatic cylinder. Shaft coupling not shown.

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Fig. 5

Preliminary peak-force testing of hydrogen combustion, using 26 ml of a 50/50 mix with air




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