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A eroelastic R enewable E nergy S ystem

A eroelastic R enewable E nergy S ystem. David Chesnutt, Adam Cofield, Dylan Henderson, Jocelyn Sielski, Brian Spears, Sharleen Teal, Nick Thiessen. 1. Aerodynamics Previous Work. Non-dimensional analysis completed Compared different mathematical approaches to model AED system

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A eroelastic R enewable E nergy S ystem

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  1. AeroelasticRenewable Energy System David Chesnutt, Adam Cofield, Dylan Henderson, Jocelyn Sielski, Brian Spears, Sharleen Teal, Nick Thiessen 1

  2. AerodynamicsPrevious Work • Non-dimensional analysis completed • Compared different mathematical approaches to model AED system • Selected mathematical approach - Theodorsen Flutter Theory • Program writing started • Wind tunnel testing performed to qualitatively observe operational characteristics of AED and flutter frequency using triaxial load sensor

  3. AerodynamicsCurrent Model

  4. Aerodynamics Completed Testing Testing Assembly CAD Model • Purpose • Relationship between tension and flutter speed/frequency • Inputs • Nylon Fabric Belt (1”x14”) • Tested at 3 tensions (4.9N, 9.8N, & 19.6N) • Outputs • Flutter cut-in speeds • Vibration frequency 4

  5. Aerodynamics Future Testing Testing Assembly Mounted in Wind Tunnel • Purpose • Obtain displacement functions • Calculate stresses and fatigue • Inputs • Steel foil belt (1”x14”) • Belt tension • Magnet Placement • Outputs • Flutter cut-in speed • Vibration frequency • Quantitative tri-axial force measurements 5

  6. AerodynamicsWork This Semester • Complete flutter program. • Test AED in wind tunnel to match analytical and theoretical results. • Incorporate magnetic forces into program. • Re-test AED in wind tunnel.

  7. Power Conditioning System • Circuitry model follows “forever flashlight” NightStar Physics Guide http://www.foreverflashlights.com/micro_forever_flashlights.htm

  8. ElectromechanicsPrevious Work • Equation shows relationship between induced voltage and circuit current • Current is needed to find Lorentz Forces Faction – Aerodynamic force on belt Freaction = Fbelt+Fcoil,1 – Fcoil,2 Use Newton’s Second Law of Motion to establish link between Lorentz forces and aerodynamic forces

  9. ElectromechanicsPrevious Work Developed magnetic circuit diagram to help determine flux through coils Not adequate for complex system Would require too many assumptions

  10. ElectromechanicsPrevious Work • Linked cores increases magnetic flux between coils • Should increase change in flux through coils • Greater flux change is proportional to induced voltage and power increases

  11. Angular vs. Linear Magnet Model Note Difference in Analytical Models Small Displacement (4 deg, 3.75mm)

  12. Angular vs. Linear Magnet Model Note Difference in Analytical Models Medium Displacement (8 deg, 7.5mm)

  13. Angular vs. Linear Magnet Model Note Difference in Analytical Models Large Displacement (12 deg, 11.25mm)

  14. Angular vs. Linear Magnet Model Note Difference in Analytical Models Max Displacement (16 deg, 15mm)

  15. Parameters • Belt Material Parameters • Density, MOE • Belt Configuration Parameters • Length, Width, Thickness, Mag. Placement, Tension • Power Generation Parameters • Coil/Core Parameters, Gap, Magnet Parameters

  16. ParametersOptimization and Selection • Two or three parameters will be chosen for optimization • All other parameters will be selected by mathematical method and/or available materials • Final prototype design will also dictate selection to some extent

  17. ParametersLikely Selections Most likely to be selected mathematically or due to availability: • Belt material • Belt length • Coil/core • Magnet parameters • Most likely to remain variable: • Belt width • Thickness • Tension • Magnet placement • Magnet gap Goal: Narrow parameters down just to belt width, tension, and gap

  18. Timeline Spring 2009

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