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Changes in inertia and effect on turning effort across different wheelchair configurationsPowerPoint Presentation

Changes in inertia and effect on turning effort across different wheelchair configurations

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### 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

- Aim different wheelchair configurations
- 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.

Method different wheelchair configurations

- Measured inertias of various configurations of ultralightweight wheelchair.
- Compared:
- Adjustments in axle position.
- Changes in wheel and tire type.
- Addition of several accessories.

Results different wheelchair configurations

- 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.

Conclusion different wheelchair configurations

- 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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