Sikorsky Summer 2001. S-92 Only 4 S-92’s have been built Only 4 S-92’s have been built Still...
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Transcript of Sikorsky Summer 2001. S-92 Only 4 S-92’s have been built Only 4 S-92’s have been built Still...
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Sikorsky Summer 2001Sikorsky Summer 2001
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S-92S-92
• Only 4 S-92’s have been builtOnly 4 S-92’s have been built
• Still waiting to get certifiedStill waiting to get certified
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What I did?What I did?
• Worked on the AVS (Active Vibration Worked on the AVS (Active Vibration Control).Control).
• Gathered flight data from flight test Gathered flight data from flight test preformed in West Palm Beach, FL.preformed in West Palm Beach, FL.
• Crawled around the S-92 in the Crawled around the S-92 in the hanger.hanger.
• After this co-op I knew I loved After this co-op I knew I loved HelicoptersHelicopters
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UH-60 Black HawkUH-60 Black Hawk
• Rotor Blade Hinge Damper (next Rotor Blade Hinge Damper (next Slide).Slide).
• Documented a Mathematical model.Documented a Mathematical model.
• Made Diagrams.Made Diagrams.
• Ran the model for specific cases.Ran the model for specific cases.
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100º
100º 80º
80º
Heavy SideLight Side
Rotation
Lagging Blade
Leading Blade
Wind Direction
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Summer 2002Summer 2002
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What I did?What I did?
• Created a mathematical model of Created a mathematical model of Snubber Damper to predict its Snubber Damper to predict its motion.motion.
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Cross Section of Snubber and Damper
Rubber Shims
Attached to Torque Tube
Metal Shims
Attached to Flex Beam
Damper
Snubber
Fluid Filled with Passageways
Transition Shim
y
x F = F0 sin(wt)
Figure 2. Cross Section of Snubber-Damper
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Force = F
Torsional spring = Kθ
Beam 2, EI2
Beam 1, EI1l
L y1
x
y
y2
Damper
Snubber
Transition shim
Zero Slope
Zero Slope
Figure 1. Diagram of Elastic Beams with Torsion Spring