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Project

Design Review. Off-Road Wheelchair. Project. Mobility Solutions Team. Scott Turnbull - Team Leader Brett Bonner - Assistant Team Leader Roy La Barbera – Treasurer Joey Speigl – Communications Dr. John Tester - Advisor. Our Clients. Carol Seumptewa Toni Seumptewa.

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Project

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  1. Design Review Off-Road Wheelchair Project

  2. Mobility Solutions Team • Scott Turnbull - Team Leader • Brett Bonner - Assistant Team Leader • Roy La Barbera – Treasurer • Joey Speigl – Communications • Dr. John Tester - Advisor Our Clients • Carol Seumptewa • Toni Seumptewa

  3. Problem Statement • Clients enjoy the outdoors • Current wheelchair unsuitable • Past search was unsuccessful Our objective is to design and build a safe and reliable off-road wheelchair.

  4. Deliverables • A customized off-road wheelchair • Design • Drawings • Assembly instructions • Engineering Analysis

  5. Functional Requirements • Safely, Easily Traverse Dirt Trails • Facilitates Passenger Pivot Transfers • Comfortable, Upright Seating Position • Passenger Restraint System • Braking System • Low Maintenance • Lightweight and Fit Into Client’s Truck

  6. Wheelchair Experience Quickie 2 Special Needs Baby Jogger

  7. Off-Road Wheelchair Models Quickie XTR Natural Access De-Bug

  8. Available Accessories Wheel Rims Quick Release Hubs Castors Seating Upholstery Mountain Bike Tires

  9. Safety and Stability Overall Convenience Cost Design Philosophy: What drives the design?

  10. Design Method • Modeling

  11. Wheel Sizes

  12. Design Evolution Design #1 Features: • Folding X-Member • Swinging Arms w/ Castors • 26’’ Rear Tire • 12’’ Front Castor Problems: • Too many moving parts • Questionable reliability

  13. Design Evolution Design #2 Features: • Folding X-Member • 16’’ Rear Castors • 16’’ Front Tires Problems: • Rear Castors • Steering Difficulty • Curb Navigation • Difficulty Collapsing

  14. Design Evolution Design #3 = Frozen Design Features: • Seatback Folds • Elevated Footrest • 20’’ Rear Tires • 12’’ Front Castors • Quick Release rear tires

  15. Design Evolution Moving Stationary for Transfers

  16. Design Evolution Castor Wheel Wheelchair Folded

  17. Frame Material - Aluminum 5052 • Corrosion Resistant • Weldability • Availability • High Strength-Weight Ratio • Tinius Olsen Tension Test • Su = 24,000 psi • Sy = 16,000 psi

  18. Determining Design Load • Static Load = 150 lbs • Shock Load • Worst Case Amplification Factor = 2 • Results in 300 lbs Dynamic Load

  19. FEM - Loads and Displacements

  20. FEM – Max Stress

  21. FEM – Deflection and Contour Stress F.S. = 2.8 s’ = 5,700 psi Points of Max Stress

  22. Fatigue Analysis • Sf = 16,000 psi (500 million cycles) • F.S. = 2.8 • Weight Estimate • 20 – 30 lbs • Stability Analysis • 25 Degree Slopes

  23. Schedule Followed

  24. Where We Are Behind Schedule • Approximately 1.5 Weeks Behind • Locating Vendors (Mostly Complete) • Order Ready-Made Parts • Weld Frame • Use of Time and Manpower • Assigned Design and Analysis Tasks • Manufacturing Tasks To Be Assigned

  25. Spring Semester Team Timesheet Week Hours 1 20.3 2 50.6 3 36.1 4 45.7 5 71.0 6 36.8 7 51.7 8 22.0 Total 334.2 Weekly Avg: 41.8

  26. Bill of Materials and Cost Estimate

  27. Fundraising • ASNAU - $360 • DDD - $300 • Doney Park Water - $700 • Cost Tracking • CET Account Setup • Receipts to Treasurer and Reimbursement • Notify Client to Write Check

  28. Summary • Design Finalized • Ready to Begin Manufacturing • Funds are in Place • Wheelchair Delivered May 2

  29. Questions?

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