Pwt Final Presentation
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Powered Wheelchair Trainer Final Design Presentation

Powered Wheelchair Trainer Final Design Presentation

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  • 1. Eric Domke Drew Pretzer Brandon Rood Karl Hiedemann Powered Wheelchair Trainer Design Project Fall Semester - 2008 “The ability to move is the first foundation stone in building personal dignity.” - D. Linda Bidabe Grand Valley State University Fall 2008
  • 2. Introduction ● Project Description ● Customer Needs ● Specifications ● Design Evolution ● Demonstration & Evaluation of Prototype ● Recommendations Grand Valley State University Fall 2008
  • 3. Problem Description ● Must pass test to get money from insurance company ● Not enough practice ● Powered chairs are expensive ● Goal: Build "inexpensive" device which attaches to manual wheelchairs. Grand Valley State University Fall 2008
  • 4. Target Market Grand Valley State University Fall 2008
  • 5. Customer Needs - Interviews ● Fit through a standard door ● Change between different wheelchairs quickly ● Easily transportable between different buildings. ● Good battery life. Grand Valley State University Fall 2008
  • 6. Product Specifications ● Switch Users in Under 5 Minutes ● Accommodate Different Sized Wheelchairs ● Widths of 20-25 inches ● Lengths of 32-50 inches ● Wheelbase of 16-32 inches ● Fit Through a Standard Door ● Width is under 32 inches ● Mimic a Powered Wheelchair Grand Valley State University Fall 2008
  • 7. Revision A ● Motor Calculations Torque 480.98 In-lb 54.31 N-m (Driving) Torque 209.49 In-lb 23.65 N-m (Steering) ● Support Bar Calculations ● 0.065" Wall Thickness for Steel Tube ● Force to Load Calculation ● 170 lbs ● Tipping Calculation ● Need to move > 9.33" off center Grand Valley State University Fall 2008
  • 8. Revision B Front of Trainer 1 2 3 Grand Valley State University Fall 2008
  • 9. Revision C ● Motor Testing ● Cordless motors possible, but durability and brake concerns ● Frictional Force Experiment ● Approx. 300 lbf to get a 4" dia. wheel over a 0.75" ledge Grand Valley State University Fall 2008
  • 10. Revision D ● Finite Element Analysis ● Need multiple gussets to minimize deflection ● Frame Design Analysis ● Tube frame is stronger and more cost effective Grand Valley State University Fall 2008
  • 11. Revision E ● Site Visit to LDC #2 Motors ● Motors cannot go between Batteries wheelchair wheels. ● Traction Analysis ● Issues with traction, especially on carpet. Grand Valley State University Fall 2008
  • 12. Final Design Grand Valley State University Fall 2008
  • 13. LDC – Final Visit Grand Valley State University Fall 2008
  • 14. Loading Goal : "Not Strenuous" Actual : Very Easy PASS ● Improvements: None Grand Valley State University Fall 2008
  • 15. Locking Goal : < 5 minutes Actual : < 1 minutes PASS ● Improvements: None Grand Valley State University Fall 2008
  • 16. Maneuverability Goal : Similar to powered Actual : Some minor PASS wheelchair deviations ● Improvements: Tweak the controls algorithms and deal with traction issues. Grand Valley State University Fall 2008
  • 17. Fits Through a Door 30" Goal : Width < 32" Actual : Width = 30" PASS ● Improvements: None Grand Valley State University Fall 2008
  • 18. Batteries Goal : Discharge > 16 hr Actual : Discharge >20 hr (BORDERLINE) FAIL (1.4 A Draw) Charge < 8 hr Charge > 10 hr ● Improvements: Better compromise between price, weight, and electrical capacity. Grand Valley State University Fall 2008
  • 19. Transportation Goal: Can fit in trunk Actual: Length and FAIL height are too large ● Improvements: Make the trainer "collapsible" into two or more pieces. ● Aluminum Frame Grand Valley State University Fall 2008
  • 20. General Concerns ● Joystick ● Loses calibration resulting in unexpected motion of the trainer ● Looser spring and better mounting system ● Traction: Cannot turn easily on carpet ● Over-Heating: Look at controls system ● Battery-Level Reading: Calibration could be off Grand Valley State University Fall 2008
  • 21. Proposed New Features ● Attendant Control ● "E-Stop" Bumper ● Joystick: "Backwards Mode" ● Multiple control interfaces Grand Valley State University Fall 2008
  • 22. Budget Part Supplier Supplier Number Cost Qty Total Cost Motor NPC NPC-B81, -B82 $339.00 2 $678.00 Charger McMaster-Carr 7558K68 $299.03 1 $299.03 Batteries Digi-Key 522-1015-ND $82.51 2 $165.02 Acrylic for Joystick McMaster-Carr 8774K43 $134.82 1 $134.82 and Controls Motor Driver Dimension Sabertooth 2x25 $124.99 1 $124.99 Engineering Subtotal $1,952.89 +20% (Shipping, tax) $390.58 Total $2,343.47 Grand Valley State University Fall 2008
  • 23. Recommendations ● Patentable? ● Continue engineering design work ● Perform market studies Grand Valley State University Fall 2008
  • 24. Our Role ● Troubleshooting existing features and making recommendations on design changes ● Website: http://sites.google.com/site/pwtgvsu/ ● E-mail: pwt.gvsu@gmail.com Grand Valley State University Fall 2008
  • 25. Special Thanks ● D. Linda Bidabe ● Founder of Move International ● Cathy Ripmaster ● Lincoln Development Center ● Karen Gora ● Mary Free Bed Rehabilitation Hospital ● Engineering Faculty and Staff Grand Valley State University Fall 2008
  • 26. Grand Valley State University Fall 2008