1 1 A R E S A eroelastic R enewable E nergy S ystem David Chesnutt, Adam Cofield, Dylan Henderson, Jocelyn Sielski, Brian Spears, Sharleen Teal, Nick Thiessen

2 Aerodynamics Previous 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 Aerodynamics Current Model

4 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 Aerodynamics Completed Testing Testing Assembly CAD Model

5 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 Aerodynamics Future Testing Testing Assembly Mounted in Wind Tunnel

6 Aerodynamics Work 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

8 F action – Aerodynamic force on belt F reaction = F belt +F coil,1 – F coil,2 Use Newton’s Second Law of Motion to establish link between Lorentz forces and aerodynamic forces Equation shows relationship between induced voltage and circuit current Current is needed to find Lorentz Forces Electromechanics Previous Work

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

10 Electromechanics Previous 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 Small Displacement (4 deg, 3.75mm) Note Difference in Analytical Models

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

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

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

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 Parameters Optimization 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 Parameters Likely 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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