Transcript January 2009 Update

Aeroelastic
Renewable
Energy
System
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
•
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
2
Aerodynamics
Current Model
3
Aerodynamics
Completed Testing
• 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
Testing Assembly CAD Model
– Flutter cut-in speeds
– Vibration frequency
4
Aerodynamics
Future Testing
• 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
Testing Assembly Mounted in Wind Tunnel
5
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.
6
Power Conditioning System
• Circuitry model follows “forever flashlight”
http://www.foreverflashlights.com/micro_forever_flashlights.htm
NightStar Physics Guide
7
Electromechanics
Previous Work


 Fx xm  Faction  Freaction
•
•
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
8
Electromechanics
Previous Work
• Developed magnetic
circuit diagram to
help determine flux
through coils
• Not adequate for
complex system
• Would require too
many assumptions
9
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
10
Angular vs. Linear
Magnet Model
Small Displacement (4 deg, 3.75mm)
Note Difference in
Analytical Models
11
Angular vs. Linear
Magnet Model
Medium Displacement (8 deg, 7.5mm)
Note Difference in
Analytical Models
12
Angular vs. Linear
Magnet Model
Large Displacement (12 deg, 11.25mm)
Note Difference in
Analytical Models
13
Angular vs. Linear
Magnet Model
Max Displacement (16 deg, 15mm)
Note Difference in
Analytical Models
14
Parameters
• Belt Material Parameters
– Density, MOE
• Belt Configuration Parameters
– Length, Width, Thickness, Mag. Placement,
Tension
• Power Generation Parameters
– Coil/Core Parameters, Gap, Magnet
Parameters
15
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
16
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
17
Timeline Spring 2009
Jan Jan Jan Feb Feb Feb Feb Mar Mar Mar Mar Mar 2911-17 18-24 25-31 1-7 8-14 15-21 22-28 1-7 8-14 15-21 22-28 Apr 4
Materials Ordered
Variable Classification and
Selection
Analytical Calculations
(MATLAB, C, ANSYS)
Prototype Design
Power Conditioning Design
and Construction
Test Plans
Prototype Construction
Testing
Data Analysis
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