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Published byMarjatta Tuominen Modified over 6 years ago
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Customization of Educational Resources for Harris-Hillman Special Education School
Robert Connor
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Proposed Problem An adjustable tray with side pieces (wings) (to keep arms inside). The tray needs to adjust height and angle--to fit feeder seat. A small motor installed under a vestibular board to make it rock intermittently.
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Background Special Education students are Special
Harris-Hillman contains the students that are too handicapped for inclusion Irene Lowe’s class contains the most handicapped of all Harris-Hillman students References: Duran, Elva. Teaching the Moderately and Severely Handicapped Student and Autistic Adolescent. Charles C. Thomas:1988 Berdine, W; Blackhurst. An Introduction to Special Education. New York: 1985.
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Project Breakdown
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Subject Anthropometrics
Sitting height 60 cm Weight 26.3kg(58lb) vertical CG at 30% sitting height (~18cm) from base horizontal CG 20cm from seat back Reference Roche, Alex and Robert Malina. Manual of Physical Status and Performance in Childhood. Vol. 1A. Plenum Press. New York: 1983.
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Calculations and Testing
Moments Withstood Sagittal Plane 11Nm Frontal Plane 7Nm Forces exerted Sagittal Plane Forward Muscle Force= 200N Gravitational Force= 45N Frontal Plane Side Muscle Force=22N Gravitational Force=45N
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Design Specifications
Strength Considerations 100 cm^2 of touch fastener minimum 187 cm^2 Incorporated in Design Safety Factor 1.87
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Safety Considerations
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Economic Analysis Market Analysis Cost/Benefit Customers Life cycle
tall, severely-handicapped individuals with little muscle control 10,000 students nationwide Life cycle lasts about two years depending of frequency of use Cost/Benefit Development Costs 1 for 60 hours Materials $20 Benefit Analysis Safer experience 10 minutes of Instructor’s time per day ($5/day)
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Questions and Suggestions
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