Assessment of power losses due to ground contact forces during usual manual wheelchair movements

Bascou, Joseph; Fallot, Constantin; Pillet, Hélène; Hybois, Samuel; Lavaste, F.; Sauret, Christophe

doi:10.1080/10255842.2017.1382834

Cited by 3 publications

(2 citation statements)

References 5 publications

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“…Energy is supplied by the user to the wheelchair via the hand-rims, and is predominately lost at the interface between the tires and the ground. This energy loss is determined by a variety of factors such as the load distribution on the drive wheels [ 9 – 11 ], inflation [ 12 , 13 ] and material properties of the tire [ 9 ], and the trajectory of motion behaviour of the tire under different types of motion [ 10 , 14 ]: straight, forward-facing motion is tied to a simple rolling behaviour of the wheels, whereas a turning manoeuvre places the wheels under torqueing scrub-type motion or induces swivel on the front casters. At the wheelchair-level, performance is influenced by the fore-aft weight distribution of the occupied chair [ 15 – 17 ], which is commonly defined by the weight over the rear sets of wheels.…”

Section: Introductionmentioning

confidence: 99%

Effects of wheels and tires on high-strength lightweight wheelchair propulsion cost using a robotic wheelchair tester

Misch

Sprigle

2021

Disability and Rehabilitation: Assistive Technology

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Purpose: This study was designed to investigate the effect of wheel and tire selections on the propulsion characteristics of a high-strength lightweight manual wheelchair using robotic wheelchair propulsion. Materials and methods: Four configurations were compared with differing combinations of drive wheel tires and casters, with the baseline reflecting the manufacturer configuration of a solid mag drive wheel and 8”×1” caster. The robotic wheelchair tester propelled the chair using pre-generated straight and curvilinear manoeuvres using repeatable and reliable cyclic torque profiles. Additionally, energy loss of the components was measured using coast-down deceleration tests to approximate the system-level rolling resistance of each configuration. Results: Results indicate a significant decrease in propulsion cost, increased distance travelled and increased manoeuvrability across all configurations, with upgraded casters and tires. Conclusions: These results indicated that with better casters and drive wheel tires, the performance of high strength lightweight wheelchairs can be improved and better meet the mobility needs of users.

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Section: Introductionmentioning

confidence: 99%

Effects of wheels and tires on high-strength lightweight wheelchair propulsion cost using a robotic wheelchair tester

Misch

Sprigle

2021

Disability and Rehabilitation: Assistive Technology

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“…Caspall et al used inertial and geometric measurements of MWCs to model the turning resistance during zero-radius turns with a human operator [40]. Sauret, Bascou, and Fallot have generated mathematical models using the rolling resistance [14] and turning resistance [22,35] measurements to assess energy losses through non-conservative ground contact forces [41]. Medola et al developed a mathematical model to partition MWC kinetic energy into translational, rotational, and turning energies using geometric measurements and inertial parameters of system components [42].…”

Section: Introductionmentioning

confidence: 99%

Modeling manual wheelchair propulsion cost during straight and curvilinear trajectories

2020

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Minimizing the effort to propel a manual wheelchair is important to all users in order to optimize the efficiency of maneuvering throughout the day. Assessing the propulsion cost of wheelchairs as a mechanical system is a key aspect of understanding the influences of wheelchair design and configuration. The objective of this study was to model the relationships between inertial and energy-loss parameters to the mechanical propulsion cost across different wheelchair configurations during straight and curvilinear trajectories. Inertial parameters of an occupied wheelchair and energy loss parameters of drive wheels and casters were entered into regression models representing three different maneuvers. A wheelchair-propelling robot was used to measure propulsion cost. General linear models showed strong relationships (R 2 > 0.84) between the system-level costs of propulsion and the selected predictor variables representing sources of energy loss and inertial influences. System energy loss parameters were significant predictors in all three maneuvers. Yaw inertia was also a significant predictor during zero-radius turns. The results indicate that simple energy loss measurements can predict system-level performance, and inertial influences are mostly overshadowed by the increased resistive losses caused by added mass, though weight distribution can mitigate some of this added cost.

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Effects of Incremental Changes to Frame Mass on Manual Wheelchair Propulsion Cost

Misch

Sprigle

2023

ASME Open Journal of Engineering

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The objective of this study was to assess the effects of small, incremental additions to wheelchair frame mass (0 kg, +2 kg, and +4 kg) on the mechanical propulsion characteristics in both straight and curvilinear maneuvers. A robotic propulsion system was used to propel a manual wheelchair over a smooth tiled surface following rectilinear (“Straight”) and curvilinear (“Slalom”) trajectories. Three unique loading conditions were tested. Propulsion costs and system rolling resistance estimations were empirically collected using the robotic wheelchair tester. Propulsion cost values were equivalent across all loading conditions over the Slalom trajectory. In the Straight trajectory, adding 2 kg on the axle had equivalent propulsion cost to the unloaded configuration. Adding 4 kg on axle was comparable, but not equivalent, to the unloaded configuration with small (≤4.1%) increases in propulsion cost. This study demonstrates that small (0–4 kg) changes to the frame mass have no meaningful impacts on the propulsion characteristics of the manual wheelchair system. Differences in propulsion cost and rolling resistance were detectable but contextually insignificant.

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Assessment of power losses due to ground contact forces during usual manual wheelchair movements

Abstract: a ini/Cerah, Woippy; b institut de Biomécanique humaine georges Charpak, arts et métiers paristech, paris KEYWORDS manual wheelchair; movement resistances; rolling; turning

Cited by 3 publications

References 5 publications

Effects of wheels and tires on high-strength lightweight wheelchair propulsion cost using a robotic wheelchair tester

Effects of wheels and tires on high-strength lightweight wheelchair propulsion cost using a robotic wheelchair tester

Modeling manual wheelchair propulsion cost during straight and curvilinear trajectories

Effects of Incremental Changes to Frame Mass on Manual Wheelchair Propulsion Cost

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