Show simple item record

dc.contributor.authorMukherjee, Sudipto
dc.contributor.authorWinter, Amos G.
dc.contributor.authorBollini, Mario A
dc.contributor.authorJudge, Benjamin M
dc.contributor.authorScolnik, Natasha
dc.contributor.authorO'Hanley, Harrison F
dc.contributor.authorDorsch, Daniel S.
dc.contributor.authorFrey, Daniel
dc.date.accessioned2017-05-09T14:23:58Z
dc.date.available2017-05-09T14:23:58Z
dc.date.issued2012-11
dc.date.submitted2012-11
dc.identifier.isbn978-0-7918-4521-9
dc.identifier.urihttp://hdl.handle.net/1721.1/108770
dc.description.abstractThe Leveraged Freedom Chair (LFC) is a low-cost, all-terrain, variable mechanical advantage, lever-propelled wheelchair designed for use in developing countries. The user effectively changes gear by shifting his hands along the levers; grasping near the ends increases torque delivered to the drive-train, while grasping near the pivots enables a larger angular displacement with every stroke, which increases angular velocity in the drivetrain and makes the chair go faster. This paper chronicles the design evolution of the LFC through three user trials in East Africa, Guatemala, and India. Feedback from test subjects was used to refine the chair between trials, resulting in a device 9.1 kg (20 lbs) lighter, 8.9 cm (3.5 in) narrower, and with a center of gravity 12.7 cm (5 in) lower than the first iteration. Survey data substantiated increases in performance after successive iterations. Quantitative biomechanical performance data were also measured during the Guatemala and India trials, which showed the LFC to be 76 percent faster and 41 percent more efficient during a common daily commute and able to produce 51 percent higher peak propulsion force compared to conventional, pushrim-propelled wheelchairs.en_US
dc.language.isoen_US
dc.publisherAmerican Society of Mechanical Engineers (ASME)en_US
dc.relation.isversionofhttp://dx.doi.org/10.1115/IMECE2012-88881en_US
dc.rightsArticle is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.en_US
dc.sourceAmerican Society of Mechanical Engineers (ASME)en_US
dc.titleStakeholder-Driven Design Evolution of the Leveraged Freedom Chair Developing World Wheelchairen_US
dc.typeArticleen_US
dc.identifier.citationWinter, Amos G.; Bollini, Mario A.; Judge, Benjamin M.; Scolnik, Natasha K.; O’Hanley, Harrison F.; Dorsch, Daniel S.; Mukherjee, Sudipto and Frey, Daniel D.“Stakeholder-Driven Design Evolution of the Leveraged Freedom Chair Developing World Wheelchair.” ASME 2012 International Mechanical Engineering Congress and Exposition, Volume 5: Education and Globalization; General Topics, American Society of Mechanical Engineers, November 2012.en_US
dc.contributor.departmentMassachusetts Institute of Technology. Department of Mechanical Engineeringen_US
dc.contributor.mitauthorWinter, Amos G.
dc.contributor.mitauthorBollini, Mario A
dc.contributor.mitauthorJudge, Benjamin M
dc.contributor.mitauthorScolnik, Natasha
dc.contributor.mitauthorO'Hanley, Harrison F
dc.contributor.mitauthorDorsch, Daniel S.
dc.contributor.mitauthorFrey, Daniel
dc.relation.journalASME 2012 International Mechanical Engineering Congress and Exposition, Volume 5: Education and Globalization; General Topicsen_US
dc.eprint.versionFinal published versionen_US
dc.type.urihttp://purl.org/eprint/type/ConferencePaperen_US
eprint.statushttp://purl.org/eprint/status/NonPeerRevieweden_US
dspace.orderedauthorsWinter, Amos G.; Bollini, Mario A.; Judge, Benjamin M.; Scolnik, Natasha K.; O’Hanley, Harrison F.; Dorsch, Daniel S.; Mukherjee, Sudipto; Frey, Daniel D.en_US
dspace.embargo.termsNen_US
dc.identifier.orcidhttps://orcid.org/0000-0002-4151-0889
dc.identifier.orcidhttps://orcid.org/0000-0001-9233-2245
dc.identifier.orcidhttps://orcid.org/0000-0002-9886-7512
mit.licensePUBLISHER_POLICYen_US
mit.metadata.statusComplete


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record