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Wheelchair Power Assist . Michael Bowman Team 28. Overview. Introduction Project Objectives Functional Diagram Similar Products including Market Analysis Project Specifications System Block Diagram Gantt Chart Cost Analysis. Henry W. Owen School. Chelsea, Massachusetts. Consultants:.
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Wheelchair Power Assist Michael Bowman Team 28
Overview • Introduction • Project Objectives • Functional Diagram • Similar Products including Market Analysis • Project Specifications • System Block Diagram • Gantt Chart • Cost Analysis
Henry W. Owen School Chelsea, Massachusetts
Consultants: • Client: James • Disorder: Degenerative Muscle disease • Contact: Bob Wierzbicki
Client Request • Due to muscle weakness caused by the client’s disease, he needs a way to add extra force when moving his wheelchair, allowing him to move around on his own.
Project Objectives • Power Assist add-on to retro-fit existing wheelchair • Easy-to-use controller for assist adjustments or total control • Easy removal of Power Assist device
Functional Diagram (diagram courtesy of Yamaha JXW-1)
Similar Products Quickie Xtender Power Assist Sunrise Medical List Price: $6,295
Similar Products e-motion M15 Frank Mobility Systems List Price: $7,675
Market Analysis • 2002 US Census Data : • 2.8 million US citizens required a wheelchair* • 93% of wheelchair users used manual wheelchairs* • Electric wheelchairs can range from $4000 to $15,000+, while manual wheelchairs cost in the hundreds of dollars * Americans with Disabilities: 2002 Current Population Report P70-107
Project Specifications • Two 12V 12A batteries • Two 24V 120W motors • Purchased/Designed Motor Controller • Designed attachment at wheel hub • Designed User Controller
Gantt Chart Tasks and Subtasks
Cost Analysis – Component Cost • AmstronAP-12120F2 12V/12A battery (2) - $35 each • Sabertooth Dual 12A 6V-24V R / C Regenerative Motor Driver - $65 • 24V brush motor kit (2) - $200 each • PICkit Microcontroller - $50 • Various materials needed for controller - $100
Cost Analysis – Total Cost • Component Cost: (determined from previous page) -- $685 • Direct Labor: (determined using the formula $30.28/hr x 15 hrs/week x 20 weeks) -- $9,084 • Overhead: (determined by 51% of direct labor) -- $4,632.84 • Total Cost: Direct Labor = $9,084.00 + Overhead = $4,634.84 + Component Cost = $685 _____________________________ Total Cost= $14,401.84
Sources • http://www.rehabmart.sg/Wheelchairs/Motorized%20Wheelchairs/Yamaha%20JWX-1.pdf • http://www.newdisability.com/wheelchairstatistics.htm • http://www.census.gov/hhes/www/disability/sipp/disab02/awd02.html • http://search.atbatt.com/search?asug=&w=12V&x=0&y=0 • http://www.atbatt.com/product/20766/sla/amstron/12v-12ah/battery • http://www.thesuperkids.com/scmococoki.html • http://www.allegromedical.com/mobility-scooters-c533/quickie-xtender-power-assist-p189918.html?engine=froogle&utm_source=froogle&utm_medium=feed&CS_003=9164468&CS_010=8ab281020bb66dff010bb679f2d02029&gdftrk=gdfV21244_a_7c477_a_7c4637_a_7c189918 • http://www.frankmobility.com/