BILATERAL INSTRUMENTED WHEEL SYSTEM FOR MEASURING HANDRIM FORCES DURING MANUAL WHEELCHAIR PROPULSION

The purpose of this study was to design and validate a new bilateral instrumented wheel system (IWS) to measure triaxial handrim forces and torques simultaneously during the wheelchair propulsion. The designed and implemented system measures the force applied to the handrims on both sides of a manual wheelchair using 6-axis force/torque sensors. In addition, a user interface receives the measurements from the left and right IWSs. To verify the accuracy of the wheel system, we evaluate force and torque measurements during the static and dynamic tests. The maximum error in static measurements of force and torque are 4.29% and 1.95%, respectively. Likewise, dynamic tests using planar forces and axle torques provide low errors and measurements that are highly correlated with the expected values ([Formula: see text]). The results revealed that the proposed IWS can be used to measure bilateral 3D handrim reaction forces with acceptable accuracy.

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Validation of a Biofeedback System for Wheelchair Propulsion Training

Rehabilitation Research and Practice ◽

10.1155/2011/590780 ◽

2011 ◽

Vol 2011 ◽

pp. 1-7 ◽

Cited By ~ 4

Author(s):

Liyun Guo ◽

Andrew M. Kwarciak ◽

Russell Rodriguez ◽

Nilanjan Sarkar ◽

W. Mark Richter

Keyword(s):

Wheel Speed ◽

Wheelchair Propulsion ◽

Static Force ◽

Dynamic Measurements ◽

Manual Wheelchair ◽

System A ◽

Torque Measurements ◽

Biofeedback System ◽

Highly Correlated ◽

Torque Values

This paper describes the design and validation of the OptiPush Biofeedback System, a commercially available, instrumented wheel system that records handrim biomechanics and provides stroke-by-stroke biofeedback and targeting for 11 propulsion variables. Testing of the system revealed accurate measurement of wheel angle (0.02% error), wheel speed (0.06% error), and handrim loads. The maximum errors in static force and torque measurements were 3.80% and 2.05%, respectively. Measured forces were also found to be highly linear (0.985 < slope < 1.011) and highly correlated to the reference forces (r2> .998). Dynamic measurements of planar forces ( and ) and axle torque also had low error (−0.96 N to 0.83 N for force and 0.10 Nm to 0.14 Nm for torque) and were highly correlated (r> .986) with expected force and torque values. Overall, the OptiPush Biofeedback System provides accurate measurement of wheel dynamics and handrim biomechanics and may be a useful tool for improving manual wheelchair propulsion.

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Quotation of upper limb risk musculoskeletal disorders by fuzzy logic: Particular case of manual wheelchair propulsion and curb ascent

Movement & Sport Sciences - Science & Motricité ◽

10.1051/sm/2015037 ◽

2016 ◽

pp. 33-40

Author(s):

Claire Marchiori ◽

Didier Pradon ◽

Dany Gagnon ◽

Djamel Bensmail

Keyword(s):

Fuzzy Logic ◽

Musculoskeletal Disorders ◽

Upper Limb ◽

Wheelchair Propulsion ◽

Manual Wheelchair

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Impact of Upper Body Anthropometrics on Spatiotemporal Parameters during Manual Wheelchair Propulsion in Able-bodied Users

2020 IEEE 5th Middle East and Africa Conference on Biomedical Engineering (MECBME) ◽

10.1109/mecbme47393.2020.9265122 ◽

2020 ◽

Author(s):

Hassanain Ali Lafta Mossa ◽

Gemma Whatling ◽

Cathy Holt

Keyword(s):

Upper Body ◽

Wheelchair Propulsion ◽

Manual Wheelchair ◽

Spatiotemporal Parameters

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The effect of the indenter elasticity on the Hertzian fracture of brittle materials

Proceedings of the Royal Society of London Series A - Mathematical and Physical Sciences ◽

10.1098/rspa.1973.0082 ◽

1973 ◽

Vol 334 (1596) ◽

pp. 95-117 ◽

Cited By ~ 121

Keyword(s):

Fracture Stress ◽

Opposite Effect ◽

Test Material ◽

Test Surface ◽

Dynamic Tests ◽

Frictional Forces ◽

Consistent Increase ◽

Static And Dynamic Tests ◽

Ring Crack ◽

Ring Cracks

A spherical indenter loaded statically or dynamically into contact with the surface of a brittle material produces a well-defined ring crack. This phenomenon, when interpreted by the Hertz theory of elastic contact, provides a convenient test for the strength of the material. If the elastic modulus of the indenter is different from that of the test material, e. g. a steel indenter in contact with a glass surface, frictional forces are brought into play at the interface which modify the Hertz distribution of contact stress. This effect has been examined both theoretically and experimentally. An indenter which is more rigid than the test surface is shown to lead to an apparent increase in fracture strength of the material, a less rigid indenter has the opposite effect. Static and dynamic tests of plate glass showed a consistent increase in apparent fracture stress of about 50 % using spherical steel indenters compared with glass indenters. This increase agrees well with the influence of friction upon the Hertzian stress calculated theoretically. The average radius of the ring cracks produced by steel indenters was observed to be greater than that produced by glass indenters, an effect of friction also predicted by the theory. Secondary ring cracks of smaller radius have frequently been observed during unloading of a steel indenter. These were not found when a glass indenter was used and an explanation is suggested in terms of the frictional effect which arises from a difference in elasticity between the indenter and the test surface.

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Evaluation Method of U-Bolt Energy Absorption

Volume 8: Seismic Engineering ◽

10.1115/pvp2009-77579 ◽

2009 ◽

Author(s):

Eiji Shirai ◽

Tetsuya Zaitsu ◽

Kazutoyo Ikeda ◽

Toshiaki Yoshii ◽

Masami Kondo ◽

...

Keyword(s):

Energy Absorption ◽

Evaluation Method ◽

Design Procedure ◽

Piping System ◽

Design Technique ◽

Dynamic Tests ◽

Key Issues ◽

Static And Dynamic Tests ◽

Force Displacement ◽

Rigid Design

At domestic PWR plants in Japan, one of the major key issues is earthquake-proof safety [1–3]. Recently, a design procedure using energy absorption, not conventional rigid design, was authorized according to revised review guidelines for aseismic design (JEAC4601). Therefore, we focused on the design technique that utilizes energy absorption effects to reduce the seismic responses of the piping system with U-Bolt, by the static and dynamic tests of simplified piping model supported by U-Bolt. The force-displacement characteristics and a fatigue diagram were obtained by the tests.

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Inspection and Model Experiment of a Damaged Arch Bridge

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.340-341.223 ◽

2007 ◽

Vol 340-341 ◽

pp. 223-228

Author(s):

Ying Fang Fan ◽

Zhi Qiang Hu ◽

Jing Zhou

Keyword(s):

Model Experiment ◽

Dynamic Test ◽

Dynamic Responses ◽

Dynamic Tests ◽

Arch Bridge ◽

Mechanical Responses ◽

Organic Glasses ◽

Bridge Model ◽

Static And Dynamic Tests ◽

Good Agreement

The structural behavior of an old six-span reinforced concrete arch bridge, which has been in service for about 40 years, is investigated. Field monitoring (inclusive of test of material property, static and dynamic test of the bridge) was conducted, static and dynamic responses of the bridge are obtained. Based on the primitive bridge, a scaled one-span bridge model was fabricated by organic-glasses. Both the static and dynamic tests were executed on the bridge model in the laboratory. Since the arch rib is the crucial member for the arch bridge, 7 notches were cut on both arch ribs of the bridge model to simulate different damages of the arch rib. Mechanical responses of the bridge with different damages on the arch ribs were achieved. FEM analyses were preformed on the bridge as well. Numerical results show good agreement with the experimental results.

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