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John Wloch
Wind-Aid
Preliminary Design Review11 March 2008
Current Status – On Schedule•Individual Trade Studies
• Completed and Uploaded to website
•Ordered/Acquired most components for prototype• Generator, Blades, Batteries, Base Materials
•Tower Materials
•DC-DC Converter/Voltage Regulator
Wind-Aid
Show Stoppers:•None at this time
We are on schedule, per group and class project timetables
Trade Study Decisions
• Twist angle of blade along length is optimized, as well as blade length• Generator has been selected and optimum input conditions determined, considered• Tower segments will be Al, Schedule 5S; 4, 3, and 2.5 in.• Base with 130 lbs can resist a 45 mph wind
Wind-Aid
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Distance from Axis [r] (in)
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Next Week
Action Items:
• Assemble Base
• Flowchart for Microcontroller Coding
• Finalize Tower Design and Acquire Materials
Wind-Aid
Wind-Aid
Questions?
Wind-Aid
Max Stress on Blade vs Solidity Total Weight of Blades (3) vs Length
Blade Sizing and Material Selection
• Ideal Length for 25 W at 12 mph wind speed is 28 inches
• Ideal Material based on strength and weight considerations is Carbon Fiber
Wind-AidBlade Shaping
•Twist angle of blade along length is optimized.•Optimized for wind speed of 12 mph and generator speed of 500 rpm
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5.0
10.0
15.0
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25.0
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3 6 9 12 15 18 21 24 27 30
Distance from Axis [r] (in)
Bla
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s)
Results of the Trade Study:• Steel is too heavy to use• PVC pipe is not rigid enough• A bigger tower geometry is needed
to use aluminum as tower material
Tower
Wind-Aid
Nominal Diameter (in)
Outer Diameter (in)
Inner Diameter(in)
4 4.5 4.4173 3.5 3.417
2.5 2.875 2.792
SCHEDULE: 5SWeight = 8.65 lbs.Material = AluminumIts total deformation is 0.14 in.
Wind-Aid
•Base weight was varied from 5-130 lbs•A 130 lb base can resist a max. 45 mph wind
Base Stability
Previous Concept Sketch
Wind-Aid