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AAeroelastic

RRenewable

EEnergy

SSystem

David Chesnutt, Adam Cofield, Dylan Henderson, Jocelyn Sielski, Brian Spears, Sharleen Teal, Nick Thiessen

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

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• 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 frequency4

AerodynamicsCompleted Testing

Testing Assembly CAD Model

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• 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

AerodynamicsFuture Testing

Testing Assembly Mounted in Wind Tunnel

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 Guidehttp://www.foreverflashlights.com/micro_forever_flashlights.htm

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• 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

reactionactionx FFmxF

• Equation shows relationship

between induced voltage and circuit current

• Current is needed to find Lorentz Forces

ElectromechanicsPrevious Work

9

• Developed magnetic circuit diagram to help determine flux through coils

• Not adequate for complex system

• Would require too many assumptions

ElectromechanicsPrevious Work

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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

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Angular vs. Linear Magnet Model

Small Displacement (4 deg, 3.75mm)

Note Difference in Analytical Models

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Angular vs. Linear Magnet Model

Medium Displacement (8 deg, 7.5mm)

Note Difference in Analytical Models

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Angular vs. Linear Magnet Model

Large Displacement (12 deg, 11.25mm)

Note Difference in Analytical Models

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Angular vs. Linear Magnet Model

Max Displacement (16 deg, 15mm)

Note Difference in Analytical Models

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Parameters

• Belt Material Parameters– Density, MOE

• Belt Configuration Parameters– Length, Width, Thickness, Mag. Placement,

Tension

• Power Generation Parameters– Coil/Core Parameters, Gap, Magnet

Parameters

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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

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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

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Timeline Spring 2009

Jan 11-17

Jan 18-24

Jan 25-31

Feb 1-7

Feb 8-14

Feb 15-21

Feb 22-28

Mar 1-7

Mar 8-14

Mar 15-21

Mar 22-28

Mar 29-Apr 4

Materials Ordered

Variable Classification and SelectionAnalytical Calculations (MATLAB, C, ANSYS)

Prototype Design

Power Conditioning Design and Construction

Test Plans

Prototype Construction

Testing

Data Analysis

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