Document Detail


Influence of wheelchair front caster wheel on reverse directional stability.
MedLine Citation:
PMID:  15137726     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The purpose of this research was to study directional stability during reversing of rear-wheel drive, electric powered wheelchairs (EPW) under different initial front caster orientations. Specifically, the weight distribution differences caused by certain initial caster orientations were examined as a possible mechanism for causing directional instability that could lead to accidents. Directional stability was quantified by measuring the drive direction error of the EPW by a motion analysis system. The ground reaction forces were collected to determine the load on the front casters, as well as back-emf data to attain the speed of the motors. The drive direction error was found to be different for various initial caster orientations. Drive direction error was greatest when both casters were oriented 90 degrees to the left or right, and least when both casters were oriented forward. The results show that drive direction error corresponds to the loading difference on the casters. The data indicates that loading differences may cause asymmetric drag on the casters, which in turn causes unbalanced torque load on the motors. This leads to a difference in motor speed and drive direction error.
Authors:
Songfeng Guo; Rory A Cooper; Tom Corfman; Dan Ding; Garrett Grindle
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Assistive technology : the official journal of RESNA     Volume:  15     ISSN:  1040-0435     ISO Abbreviation:  Assist Technol     Publication Date:  2003  
Date Detail:
Created Date:  2004-05-12     Completed Date:  2004-07-06     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8917250     Medline TA:  Assist Technol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  98-104     Citation Subset:  T    
Affiliation:
University of Pittsburgh, SHRS, Department of Rehabilitation Science and Technology, and VA Pittsburgh Healthcare System, Pittsburgh, Pennsylvania 15206, USA.
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MeSH Terms
Descriptor/Qualifier:
Computer Simulation
Electronics / instrumentation*
Equipment Design*
Equipment Safety
Humans
Materials Testing
Motion
Motor Vehicles
Rotation*
Shear Strength
Wheelchairs*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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