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Dynamic calibration of a wheelchair dynamometer

Digiovine, CP and Cooper, RA and Boninger, MA (2001) Dynamic calibration of a wheelchair dynamometer. Journal of Rehabilitation Research and Development, 38 (1). 41 - 55. ISSN 0748-7711

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Abstract

The inertia and resistance of a wheelchair dynamometer must be determined in order to compare the results of one study to another, independent of the type of device used. The purpose of this study was to describe and implement a dynamic calibration test for characterizing the electro-mechanical properties of a dynamometer. The inertia, the viscous friction, the kinetic friction, the motor back-electromotive force constant, and the motor constant were calculated using three different methods. The methodology based on a dynamic calibration test along with a nonlinear regression analysis produced the best results. The coefficient of determination comparing the dynamometer model output to the measured angular velocity and torque was 0.999 for a ramp input and 0.989 for a sinusoidal input. The inertia and resistance were determined for the rollers and the wheelchair wheels. The calculation of the electro-mechanical parameters allows for the complete description of the propulsive torque produced by an individual, given only the angular velocity and acceleration. The measurement of the electro-mechanical properties of the dynamometer as well as the wheelchair/human system provides the information necessary to simulate real-world conditions.


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Details

Item Type: Article
Status: Published
Creators/Authors:
CreatorsEmailPitt UsernameORCID
Digiovine, CP
Cooper, RARCOOPER@pitt.eduRCOOPER
Boninger, MA
Centers: Other Centers, Institutes, or Units > Human Engineering Research Laboratories
Date: 1 December 2001
Date Type: Publication
Journal or Publication Title: Journal of Rehabilitation Research and Development
Volume: 38
Number: 1
Page Range: 41 - 55
Schools and Programs: School of Health and Rehabilitation Sciences > Rehabilitation Science and Technology
Refereed: Yes
ISSN: 0748-7711
MeSH Headings: Calibration; Equipment Design; Ergometry--instrumentation; Humans; Mathematics; Regression Analysis; Torque; Wheelchairs
PubMed ID: 11322470
Date Deposited: 03 Oct 2012 20:47
Last Modified: 02 Feb 2019 14:56
URI: http://d-scholarship.pitt.edu/id/eprint/14699

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