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Dynamic calibration of a wheelchair dynamometer
C P DiGiovine1, R A Cooper, M L Boninger
1Human Engineering Research Laboratories, VA Rehabilitation Research and Development Center, VA Pittsburgh Healthcare System, PA 15206, USA.
Journal of Rehabilitation Research and Development
|April 27, 2001
Summary
Accurate wheelchair dynamometer calibration is crucial for consistent research. A dynamic calibration test effectively characterizes its electro-mechanical properties, enabling precise analysis of wheelchair user performance.
Area of Science:
- Biomechanics
- Rehabilitation Engineering
- Mechanical Engineering
Background:
- Wheelchair dynamometers are essential for assessing user performance.
- Variability in dynamometer design necessitates standardized calibration methods.
- Consistent data comparison across studies requires accurate characterization of device properties.
Purpose of the Study:
- To develop and implement a dynamic calibration test for wheelchair dynamometers.
- To characterize the electro-mechanical properties of a wheelchair dynamometer.
- To establish a method for comparing results independent of specific device models.
Main Methods:
- Calculated inertia, viscous friction, kinetic friction, motor back-EMF constant, and motor constant.
- Employed three distinct calculation methods.
- Utilized a dynamic calibration test combined with nonlinear regression analysis.
Main Results:
- The dynamic calibration test with nonlinear regression yielded optimal results.
- Achieved a coefficient of determination of 0.999 (ramp input) and 0.989 (sinusoidal input).
- Successfully determined inertia and resistance for rollers and wheelchair wheels.
Conclusions:
- The electro-mechanical parameters provide a complete description of propulsive torque.
- This calibration method allows for simulation of real-world wheelchair use conditions.
- Enables accurate comparison of wheelchair user performance data across different studies.