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Measurement of rolling resistance and scrub torque of manual wheelchair drive wheels and casters
Assistive Technology ( IF 2.170 ) Pub Date : 2019-12-31 , DOI: 10.1080/10400435.2019.1697907
Stephen Sprigle 1 , Morris Huang 1 , Jacob Misch 1
Affiliation  

ABSTRACT

The effort needed to maneuver a manual wheelchair is a function of the occupied wheelchair’s inertia and energy loss. The primary source of energy loss is due to the resistance of the drive wheels and casters on the ground. Specifically, manual wheelchairs have two major sources of frictional energy loss: rolling resistance and scrub torque. The objective of this study was to develop and validate component-level test methods to evaluate the energy loss properties of drive wheels and casters on different surfaces and with different applied loads. Rolling resistance is measured using a weighted coast-down cart and scrub torque is calculated by measuring the force required to rotate a plate that is loaded onto the tire’s surface. Each test method was iterated and then applied to a cohort of drive wheels and casters. Both test methods demonstrated acceptable repeatability and the ability to distinguish energy loss parameters between common wheelchair components. The results show that caster and drive wheel energy losses can vary significantly across surfaces and with increased load on the casters. However, the findings also illuminate complex relationships between rolling resistance and scrub torque performance that embody a tradeoff in performance as applied to mobility during everyday life.



中文翻译:

手动轮椅驱动轮和脚轮滚动阻力和擦洗扭矩的测量

摘要

操纵手动轮椅所需的努力是占用轮椅的惯性和能量损失的函数。能量损失的主要来源是地面上的驱动轮和脚轮的阻力。具体来说,手动轮椅有两个主要的摩擦能量损失来源:滚动阻力和擦洗扭矩。本研究的目的是开发和验证组件级测试方法,以评估驱动轮和脚轮在不同表面和不同施加载荷下的能量损失特性。滚动阻力是使用加权滑行车测量的,擦洗扭矩是通过测量旋转加载到轮胎表面的板所需的力来计算的。每个测试方法都经过迭代,然后应用于一组驱动轮和脚轮。两种测试方法都证明了可接受的可重复性和区分常见轮椅部件之间能量损失参数的能力。结果表明,随着脚轮负载的增加,脚轮和驱动轮的能量损失在不同表面上会发生显着变化。然而,这些发现也阐明了滚动阻力和擦洗扭矩性能之间的复杂关系,这体现了在日常生活中应用于移动性时的性能权衡。

更新日期:2019-12-31
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