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Identification and proposed control of helicopter transmission noise at the sourceHelicopter cabin interiors require noise treatment which is expensive and adds weight. The gears inside the main power transmission are major sources of cabin noise. Work conducted by the NASA Lewis Research Center in measuring cabin interior noise and in relating the noise spectrum to the gear vibration of the Army OH-58 helicopter is described. Flight test data indicate that the planetary gear train is a major source of cabin noise and that other low frequency sources are present that could dominate the cabin noise. Companion vibration measurements were made in a transmission test stand, revealing that the single largest contributor to the transmission vibration was the spiral bevel gear mesh. The current understanding of the nature and causes of gear and transmission noise is discussed. It is believed that the kinematical errors of the gear mesh have a strong influence on that noise. The completed NASA/Army sponsored research that applies to transmission noise reduction is summarized. The continuing research program is also reviewed.
Document ID
19880007264
Acquisition Source
Legacy CDMS
Document Type
Other
Authors
Coy, John J. (Army Aviation Research and Development Command Cleveland, OH., United States)
Handschuh, Robert F. (Army Aviation Research and Development Command Cleveland, OH., United States)
Lewicki, David G. (Army Research and Technology Labs. Cleveland, Ohio., United States)
Huff, Ronald G. (NASA Lewis Research Center Cleveland, OH., United States)
Krejsa, Eugene A. (NASA Lewis Research Center Cleveland, OH., United States)
Karchmer, Allan M. (NASA Lewis Research Center Cleveland, OH, United States)
Coy, John J. (Army Aviation Research and Development Command, Cleveland OH., United States)
Date Acquired
September 5, 2013
Publication Date
February 1, 1988
Publication Information
Publication: NASA, Washington, NASA(Army Rotorcraft Technology. Volume 2: Materials and Structures, Propulsion and Drive Systems, Flight Dynamics and Control, and Acoustics
Subject Category
Aircraft Stability And Control
Accession Number
88N16647
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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