1. Wheelchair Smart Anti-Tip System Design Kyle Mobley, BME Garrett Spiegel, BME Andrew Lossing, ChBE Advisor: Dr. Mark Richter, President Lossing, Mobley, Spiegel http://www.bme.vanderbilt.edu/srdesign/2009/group5/ SATS Senior Design 2009-10http://www.bme.vanderbilt.edu/srdesign/2009/group5/

2. Weight Placement Issues Side slopes Increased rolling resistance Increased severity of impact Soft surfaces Balance in wheelie position Lossing, Mobley, Spiegel http://www.bme.vanderbilt.edu/srdesign/2009/group5/ SATS Senior Design 2009-10http://www.bme.vanderbilt.edu/srdesign/2009/group5/

3. Wheelie Advantages 100% weight on rear wheels  Decreased rolling resistance  Decreased severity of impact Braking while rolling downhill Increased maneuverability Lossing, Mobley, Spiegel http://www.bme.vanderbilt.edu/srdesign/2009/group5/ SATS Senior Design 2009-10http://www.bme.vanderbilt.edu/srdesign/2009/group5/

4. Need for Anti-Tip Systems Tipping backwards  Doing a wheelie  “Tippy” wheelchairs  Injury to physical self… and self-esteem Lossing, Mobley, Spiegel http://www.bme.vanderbilt.edu/srdesign/2009/group5/ SATS Senior Design 2009-10http://www.bme.vanderbilt.edu/srdesign/2009/group5/

5. Current Anti-Tip Systems Wheelie bar  Decreased maneuverability Increased rolling resistance Increased chair weight  Hinders ability to perform wheelies  Hinders ability to perform curb cuts Users commonly remove bars from chair Lossing, Mobley, Spiegel http://www.bme.vanderbilt.edu/srdesign/2009/group5/ SATS Senior Design 2009-10http://www.bme.vanderbilt.edu/srdesign/2009/group5/

6. Last Year’s Advancements Electrically triggered control  Allowed for maneuverability and protection Options cannot be employed simultaneously  User-controlled settings Allows for situational control Need for user expertise Non-continuous Lossing, Mobley, Spiegel http://www.bme.vanderbilt.edu/srdesign/2009/group5/ SATS Senior Design 2009-10http://www.bme.vanderbilt.edu/srdesign/2009/group5/

7. Smart Anti-Tip System (SATS) Senses chair orientation, movement Computes location of COG If threshold exceeded, deploy wheelie bar  Wheelchair-specific threshold Lossing, Mobley, Spiegel http://www.bme.vanderbilt.edu/srdesign/2009/group5/ SATS Senior Design 2009-10http://www.bme.vanderbilt.edu/srdesign/2009/group5/

8. SATS Advantages Simultaneously allows maneuverability and protection from tipping Eliminates need for user input No need for user proficiency Lossing, Mobley, Spiegel http://www.bme.vanderbilt.edu/srdesign/2009/group5/ SATS Senior Design 2009-10http://www.bme.vanderbilt.edu/srdesign/2009/group5/

9. Project Methods Identify problem Research of thresholds  Various levels of “tippiness” Research of transducers Design of sensing system Design of wheelie bar deployment system Construction of prototype Testing of prototype Revisions Lossing, Mobley, Spiegel http://www.bme.vanderbilt.edu/srdesign/2009/group5/ SATS Senior Design 2009-10http://www.bme.vanderbilt.edu/srdesign/2009/group5/