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Determining the Viability of the Use of Magneto-Rheological Fluid in a Low Cost Stroke Rehabilitation Device

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dc.contributor.advisor Hollitt, Christopher
dc.contributor.advisor Browne, Will
dc.contributor.author Rajendran, Abigail
dc.date.accessioned 2013-04-30T22:05:43Z
dc.date.accessioned 2022-11-02T19:18:36Z
dc.date.available 2013-04-30T22:05:43Z
dc.date.available 2022-11-02T19:18:36Z
dc.date.copyright 2013
dc.date.issued 2013
dc.identifier.uri https://ir.wgtn.ac.nz/handle/123456789/28849
dc.description.abstract There are over 15 million people affected by strokes worldwide with a third left disabled. It is estimated that only 5 to 20 % regain upper limb functionality. However, research has shown that repetitive movement on the affected limb improves motor relearning. With the number of people affected by strokes rising each year the demand has begun straining hospital resources, therefore there is a need for some therapy to be moved away from clinical settings and into a person’s home. Robot assisted therapy is a growing field aiming to meet this demand. However currently there are no low cost devices able to actively exercise and strengthen a person’s hand during the acute (early) stage of stroke rehabilitation. This study is a part of a larger project involving the development of a low cost, assistive stroke rehabilitation device requiring a controllable damper. The aim of the study is to determine whether the use of magnetorheological fluid in a controllable damper is viable for use in the planned rehabilitation device. A rotary damper configuration was chosen as it can be made compact and avoid fluid leakage. To be deemed suitable for the application, the viscous torque of the damper needed to be controllable with varying input current. The required damping torques produced must be repeatable and needs to be generated below 34 C, the specified maximum operating temperature of the system. The performance of three vane designs for the rotary damper were investigated. These three designs were layered discs, a paddle and a helix. A test rig using a pulley configuration was designed and constructed to quantify the performance of the vane designs. The test rig recorded the opposing force and temperature measurements for each damper design. The measurements of interest were the off-state (no input current) torque, the achievable torque range, and also the consistency of the measurements. Experiments were conducted with the damper containing air to determine the pre-existing friction between the vane and housing, and water and motor oil were used as the damper fluid to investigate the performance of the designs with known fluid viscosities. Lastly experiments containing magneto-rheological fluid were conducted to determine the controllability and consistency of the viscous torque of each design. The paddle design was selected based on its range and consistency of produced torque, simplicity of the design and expected economical manufacture. With an input current of 0 to 2 A the damper produced a viscous torque range of 0.0036 Nm to 0.044 Nm, which was the equivalent opposing force of approximately 7.3 N. During testing of the various damper designs, a few imperfections were found. A modified version of the chosen damper was constructed to determine whether those features were manufacturing artifacts. It was found that the force measurements became smoother and previous periodic oscillations in the measurements were eliminated. The viscous torque of the paddle design was found to be controllable within the given operational conditions and therefore the use of magnetorheological fluid is a viable solution for use in a low cost stroke rehabilitation device. en_NZ
dc.language en_NZ
dc.language.iso en_NZ
dc.publisher Te Herenga Waka—Victoria University of Wellington en_NZ
dc.rights Access is restricted to staff and students only until 1/05/2015 en_NZ
dc.subject Magneto-rhealogical en_NZ
dc.subject Stroke en_NZ
dc.subject Rehabilitation en_NZ
dc.title Determining the Viability of the Use of Magneto-Rheological Fluid in a Low Cost Stroke Rehabilitation Device en_NZ
dc.type Text en_NZ
vuwschema.contributor.unit School of Engineering and Computer Science en_NZ
vuwschema.subject.marsden 290900 Electrical and electronic engineering en_NZ
vuwschema.subject.marsden 291400 Materials engineering en_NZ
vuwschema.subject.marsden 291500 Biomedical engineering en_NZ
vuwschema.subject.marsden 291800 Interdisciplinary engineering en_NZ
vuwschema.type.vuw Awarded Research Masters Thesis en_NZ
thesis.degree.discipline Electronic and Computer System Engineering en_NZ
thesis.degree.grantor Te Herenga Waka—Victoria University of Wellington en_NZ
thesis.degree.level Masters en_NZ
thesis.degree.name Master of Science en_NZ

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