Unicycling Efficiency Measuring Device
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Unicycling Efficiency Measuring Device

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Short presentation about some key aspects of the function and design of the device I'm building to measure unicycling efficiency quantitatively.

Short presentation about some key aspects of the function and design of the device I'm building to measure unicycling efficiency quantitatively.

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Unicycling Efficiency Measuring Device Presentation Transcript

  • 1. HelloThursday, March 31, 2011
  • 2. Measuring Unicycling EfficiencyThursday, March 31, 2011
  • 3. Problem Definition • No method exists for quantitatively 1) Monitoring training, and 2) Comparing configurations for unicycles in terms of efficiency.Thursday, March 31, 2011
  • 4. Unicycling Efficiency LossesThursday, March 31, 2011
  • 5. Efficiency Losses • Acceleration and deceleration to maintain balance on unicycle. • Minimizing this leads to increased efficiency.Thursday, March 31, 2011
  • 6. Efficiency: Reduce Drag • Wear tight clothing • Cover spokes of wheel with a disc or use bladed spokes • Adopt a more aerodynamic posture Source: Steed CyclesThursday, March 31, 2011
  • 7. Measuring Efficiency • Measure speed many times throughout individual wheel rotations. • Use velocity profile to calculate efficiency.Thursday, March 31, 2011
  • 8. Data Collection Timing and TrackingThursday, March 31, 2011
  • 9. Timing Option: Magnets • “Hal Effect” sensor placed near spokes. • Spokes crossing sensor detected magnetically Source: SparkFun ElectronicsThursday, March 31, 2011
  • 10. Timing Option: Spokes • Optical beam emitted through wheel to sensor. • Spokes break the beam, signal sent to processor. Source: todbot blogThursday, March 31, 2011
  • 11. Timing: Rim Encoder • Black tape placed at regular intervals on reflective rim. • Leading tape edge triggers reflectance sensor.Thursday, March 31, 2011
  • 12. Rotation Tracking • Wide and narrow tape sections encode a specified pattern around the wheel. • Second sensor detects HIGH on narrow sections, LOW on wide sections.Thursday, March 31, 2011
  • 13. Rotation TrackingThursday, March 31, 2011
  • 14. Rotation TrackingThursday, March 31, 2011
  • 15. Rotation Tracking C D Data:Thursday, March 31, 2011
  • 16. Rotation Tracking C D Data:Thursday, March 31, 2011
  • 17. Rotation Tracking C D Data: 0Thursday, March 31, 2011
  • 18. Rotation Tracking C D Data: 0 1Thursday, March 31, 2011
  • 19. Rotation Tracking C D Data: 0 1 0Thursday, March 31, 2011
  • 20. Rotation Tracking C D Data: 0 1 0 0Thursday, March 31, 2011
  • 21. Rotation Tracking C D Data: 0 1 0 0 1Thursday, March 31, 2011
  • 22. Rotation Tracking C D Data: 0 1 0 0 1 1Thursday, March 31, 2011
  • 23. Rotation Tracking C D Data: 0 1 0 0 1 1 1Thursday, March 31, 2011
  • 24. Rotation Tracking C D Data: 0 1 0 0 1 1 1 0Thursday, March 31, 2011
  • 25. Error & PrecisionThursday, March 31, 2011
  • 26. Sources of Error Electronics Timer/ Software Tape Placement Slew Rate 0 0.75 1.50 2.25 3.00Thursday, March 31, 2011
  • 27. Slew Rate 6 5 4 Voltage (V) 3 2 1 0 0 5 10 15 20 25 30 35 40 45 Time (s) Square wave with no slew rate (ideal)Thursday, March 31, 2011
  • 28. Slew Rate 6 5 4 Voltage (V) 3 2 1 0 0 5 10 15 20 25 30 35 40 45 Time (s) Square wave with visible slew rateThursday, March 31, 2011
  • 29. Causes of Slew Rate • Tape edge transition is not instantaneous. • Transition time in signal causes slew rate. • Other causes of slew rate from electrical circuit elements are insignificant.Thursday, March 31, 2011
  • 30. Slew Rate 6 4 2 Voltage (V) 0 0 200 400 600 800 1000 1200 1400 -2 -4 -6 250 μs Time (microseonds) Optical Sensor Response (simulated)Thursday, March 31, 2011
  • 31. Error: Tape PlacementThursday, March 31, 2011
  • 32. Tape InstallationThursday, March 31, 2011
  • 33. Delay000000 R² = 0.918000000000000Untitled 1 Untitled 15 Untitled 29 Untitled 43 Untitled 57 Untitled 71 Untitled 85 Untitled 99 Untitled 113 Untitled 127 Untitled 141 Untitled 155 Untitled 169 Untitled 183 Untitled 197 Untitled 211 Delay over six revolutions with ideal time Thursday, March 31, 2011
  • 34. Calibration Raw Velocity Data & Real OffsetThursday, March 31, 2011
  • 35. Thursday, March 31, 2011
  • 36. System OverviewThursday, March 31, 2011
  • 37. Thursday, March 31, 2011
  • 38. 38640 37880 37848 2 Error! 37564 Data 37704 37904 37640 37396 36844 38468 37940 38236 3 38032 • Stored in three-column 38788 38420 TSV text file 38020 38692 39004 • 82 KB / Km; 38472 38340 13,000 rows / Km 38988 39424 4 39148 • 39048 40 MB for 500 Km; 39468 40136 6.5M rows 39508 39404 39780 • 4GB capacity µSD card 40248 39760 1 39624 40352 40392 40288 40132 41016Thursday, March 31, 2011 40228
  • 39. Raw DataThursday, March 31, 2011
  • 40. Unicycling EfficiencyThursday, March 31, 2011
  • 41. Thursday, March 31, 2011