Sikorsky Summer 2001Sikorsky Summer 2001

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

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

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.

100º

100º 80º

80º

Heavy SideLight Side

Rotation

Lagging Blade

Leading Blade

Wind Direction

Summer 2002Summer 2002

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.

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

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

Contacts:Contacts:

Any Questions?Any Questions?

Director of HRDwayne Jackson203-386-4216djackson@sikorsky.com