Accession Number:

AD0742735

Title:

Investigation of Gearbox Design Modifications for Reducing Helicopter Gearbox Noise

Descriptive Note:

Final technical rept.

Corporate Author:

MECHANICAL TECHNOLOGY INC LATHAM NY

Personal Author(s):

Report Date:

1972-03-01

Pagination or Media Count:

172.0

Abstract:

Results presented were obtained in a continuing effort to control, through development of vibration and acoustics technology, noise produced by helicopter geared power trains. The results achieved, while not all inclusive, represent a significant step in understanding the generation of gearbox noise. Efforts undertaken, directed at both the UH-1D main and CH-47 forward rotor- drive gearboxes, included predictions of lateral natural frequency and forced response vibration characteristics of the spiral bevel gear shafts, thin-shell predictions of natural frequency and forced-response vibration characteristics of the planetary ring gear casing, general and analytical modeling of gearbox mounts and adjoining airframe structure, and collection and evaluation of existing helicopter internal noise and vibration data from helicopter manufacturers and users.

Subject Categories:

  • Helicopters
  • Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE