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This article and any supplementary material should be cited as follows: Caspall JJ, Seligsohn E, Dao PV, Sprigle S. Changes in inertia and effect on turning.

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Presentation on theme: "This article and any supplementary material should be cited as follows: Caspall JJ, Seligsohn E, Dao PV, Sprigle S. Changes in inertia and effect on turning."— Presentation transcript:

1 This article and any supplementary material should be cited as follows: Caspall JJ, Seligsohn E, Dao PV, Sprigle S. Changes in inertia and effect on turning effort across different wheelchair configurations. J Rehabil Res Dev. 2013;50(10):1353–62. http://dx.doi.org/10.1682/JRRD.2012.12.0219 Slideshow Project DOI:10.1682/JRRD.2012.12.0219JSP Changes in inertia and effect on turning effort across different wheelchair configurations Jayme J. Caspall, MS; Erin Seligsohn; Phuc V. Dao, MS; Stephen Sprigle, PhD, PT

2 This article and any supplementary material should be cited as follows: Caspall JJ, Seligsohn E, Dao PV, Sprigle S. Changes in inertia and effect on turning effort across different wheelchair configurations. J Rehabil Res Dev. 2013;50(10):1353–62. http://dx.doi.org/10.1682/JRRD.2012.12.0219 Slideshow Project DOI:10.1682/JRRD.2012.12.0219JSP Aim – Measure changes in inertial reactance or wheelchair inertia due to configuration changes in adjustable manual wheelchairs. – Relate inertial changes to differences in torque required to overcome caster scrub and accelerate wheelchairs during turning. Relevance – When executing turning maneuvers, manual wheelchair users must overcome rotational inertia of wheelchair system.

3 This article and any supplementary material should be cited as follows: Caspall JJ, Seligsohn E, Dao PV, Sprigle S. Changes in inertia and effect on turning effort across different wheelchair configurations. J Rehabil Res Dev. 2013;50(10):1353–62. http://dx.doi.org/10.1682/JRRD.2012.12.0219 Slideshow Project DOI:10.1682/JRRD.2012.12.0219JSP Method Measured inertias of various configurations of ultralightweight wheelchair. Compared: – Adjustments in axle position. – Changes in wheel and tire type. – Addition of several accessories.

4 This article and any supplementary material should be cited as follows: Caspall JJ, Seligsohn E, Dao PV, Sprigle S. Changes in inertia and effect on turning effort across different wheelchair configurations. J Rehabil Res Dev. 2013;50(10):1353–62. http://dx.doi.org/10.1682/JRRD.2012.12.0219 Slideshow Project DOI:10.1682/JRRD.2012.12.0219JSP Results Configuration with highest rotational inertia (solid tires, mag wheels with rearward axle) exceeded configuration with lowest (pneumatic tires, spoke wheels with forward axle) by 28%. Greater inertia requires increased torque to accelerate wheelchair during turning. At representative maximum acceleration, reactive torque was 11.7 to 15.0 N-m across wheelchair configurations. – At higher accelerations, torques exceeded that required to overcome caster scrub during turning.

5 This article and any supplementary material should be cited as follows: Caspall JJ, Seligsohn E, Dao PV, Sprigle S. Changes in inertia and effect on turning effort across different wheelchair configurations. J Rehabil Res Dev. 2013;50(10):1353–62. http://dx.doi.org/10.1682/JRRD.2012.12.0219 Slideshow Project DOI:10.1682/JRRD.2012.12.0219JSP Conclusion Results indicate that: – Wheelchair’s rotational inertia can significantly influence torque required during turning. – This influence will affect active users who turn at high speeds. Categorizing wheelchairs using both mass and rotational inertia would better represent differences in effort during wheelchair maneuvers.

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