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Simulation and Velomobiles

Simulation and Velomobiles. The 2005 Great Midwestern Velomobile and HPV Festival Eastern Iowa Environmental Innovators Organization (EIEIO) Nickolas Hein 11 June 2005. Outline. Fundamental Equations Terrain modeling Results Using the results. Bike design Coaching/Training.

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Simulation and Velomobiles

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  1. Simulation and Velomobiles The 2005 Great Midwestern Velomobile and HPV FestivalEastern Iowa Environmental Innovators Organization (EIEIO) Nickolas Hein 11 June 2005

  2. Outline Fundamental EquationsTerrain modelingResultsUsing the results Bike designCoaching/Training Possibilities - CurrentPossibilities - Future

  3. Fundamental EquationAcceleration Equation for Human Power Power Rolling Fric. Slope Wind Resistance a = F/m = [(P/W) - m - g - (.5rV2) ]*Wg V (W/CdA) V = Vprev + a*Dt X = Xprev +  V*Dt

  4. Terrain ModelingThree Methods • 1) Constant Slope: g = K • 2) Sine-wave Hill • g = g max* sin (2 p* x / lhill) or • g = * sin (2x * g max / h max) • where: • g max = Max hill slope • lhill = Hill length. • h max = Maximum hill height • 3) Table Lookup from recorded data • GPS recording via waypoints • GIS data from databases (Mapquest) • Manual/auto recording

  5. Results – Time History

  6. Results - Phase Plot of Speed/Height

  7. Results - Phase Plot of Speed/Accel

  8. Using the Results - Bike Design • How much can energy storage help? • What is the tradeoff between weight and drag. • What are the range of speeds/accels expected • How does streamlining affect trip times? • What is the effect of power input/timing? • Does size (of hills) matter?

  9. Using the Results – Coaching/Training • Where do you get the most benefit from putting effort in? • What is the effect of stopping partway up/down a hill? • How much energy does turning require? • Other?

  10. Possibilities – Available & Underutilized • Graphic Excel Spreadsheet • Common engineering tools (esp. Simulink) • Hacking flight simulations (esp. X-Plane) • Hacking automotive simulations • Combinations

  11. Possibilities – Available Now

  12. Possibilities - Future • Custom-coded simulation using public-domain physics engine (TOKAMAK), user interface (Eclipse) and visual system (VRML). • Cockpit hardware for rider training, design development, various studies • Open source development centrally archived (Sourceforge) • Similar projects are underway for aircraft (Flightgear) and spacecraft (Orbiter, Celestia). Does anyone know of something for road vehicles?

  13. Possibilities – Future

  14. Proposal • Objective: Make it possible for developers to collaborate on simulation development • Approach: Convene technical committee meeting to: • Survey the current technology • Identify simulation needs among riders, mfgs. • Publish standards for interfaces, methods, data formats • Identify emerging technologies and enable their use • Publish a newsletter to disseminate info and progress reports.

  15. Conclusion • Technical Committee Meeting • Time? Place? • That concludes this presentation. • Questions?

  16. Links • www.x-plane.com, www.x-plane.org flight sim 2) http://vamos.sourceforge.net/about.html – open source auto sim (links to other similar sims) 3) http://www.tokamakphysics.com 4) http://www.simradar.com/Cockpit_Building/ - Flight simulator cockpit building 5)http://www.mathworks.com/products/demos/simulink/Simulink_Key_Features/SL_R14_Key_Features.html Block diagram modeling 6) http://worldwind.arc.nasa.gov/ Global terrain and satellite photo viewer 7) Suggestions?

  17. From CycleVision 2005

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