Embed Size (px)
Citation preview
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
0.0
5.0
10.0
15.0
20.0
25.0
30.0
35.0
40.0
45.0
50.0
3 6 9 12 15 18 21 24 27 30
Distance from Axis [r] (in)
Bla
de
An
gle
(d
eg
ree
s)
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
0.0
5.0
10.0
15.0
20.0
25.0
30.0
35.0
40.0
45.0
50.0
3 6 9 12 15 18 21 24 27 30
Distance from Axis [r] (in)
Bla
de
An
gle
(d
eg
ree
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
