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Structures and Materials Division Research and Technology Directorate NASA Glenn Research Center

Tribology and mechanical Components Branch
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Aero Drive Systems - Gear Noise/Dynamics
Research Objectives
  • Reduce noise/dynamics of gear transmissions
  • Perform fundamental studies of dynamic behavior of gear systems
  • Validate gear noise/dynamics codes
  • Investigate noise attenuation techniques
Technical Challenges
  • Rotorcraft transmissions operate at high speeds and high power with large gear ratios
  • Rotorcraft transmissions are rigidly mounted to aircraft cabin, which provides structural path for noise
  • The discrete tones of gear noise can be annoying
Current Research
Fluid film “Wave Bearing” concept being developed to attenuate gear noise transmitted. This will be tested in the GRC Gear Noise Rig.

Wave bearing housing and sleeve
Above: Wave bearing housing and sleeve

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Fred Oswald
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Last Updated: April 21, 2009