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Influence of wheelchair front caster wheel on reverse directional stability

Guo, S and Cooper, RA and Corfman, T and Ding, D and Grindle, G (2003) Influence of wheelchair front caster wheel on reverse directional stability. Assistive Technology, 15 (2). 98 - 104. ISSN 1040-0435

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Abstract

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° 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. © 2003 RESNA.


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Details

Item Type: Article
Status: Published
Creators/Authors:
CreatorsEmailPitt UsernameORCID
Guo, S
Cooper, RARCOOPER@pitt.eduRCOOPER
Corfman, T
Ding, Ddad5@pitt.eduDAD5
Grindle, Gggg3@pitt.eduGGG3
Centers: Other Centers, Institutes, or Units > Human Engineering Research Laboratories
Date: 1 December 2003
Date Type: Publication
Journal or Publication Title: Assistive Technology
Volume: 15
Number: 2
Page Range: 98 - 104
DOI or Unique Handle: 10.1080/10400435.2003.10131893
Schools and Programs: School of Health and Rehabilitation Sciences > Health and Rehabilitation Sciences
Refereed: Yes
ISSN: 1040-0435
MeSH Headings: Computer Simulation; Electronics--instrumentation; Equipment Design; Equipment Safety; Humans; Materials Testing; Motion; Motor Vehicles; Rotation; Shear Strength; Wheelchairs
PubMed ID: 15137726
Date Deposited: 15 Oct 2012 14:18
Last Modified: 02 Feb 2019 14:56
URI: http://d-scholarship.pitt.edu/id/eprint/15780

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