Modal Analysis of Gear Housing and Mounts

Abstract

Dynamic finite element analysis of a real gear housing is presented. The analysis was conducted for the housing without the rotating components (gears, shafts, and bearings). Both rigid and flexible mounting conditions for the gear housing are considered in this analysis. The flexible support simulates the realistic mounting condition on a rotorcraft, and the rigid one is analyzed for comparison purposes. The effect of gear housing stiffeners is also evaluated. The results indicate that the first six natural modes of the flexibly mounted gear housing in the 0 to 200 Hz range correspond to the translational rigid body vibration modes of the housing. Above this range, the housing plate elastic modes are observed which are verified by modal analysis experiments. Parametric studies show that the housing plate stiffeners and rigid mounts tend to increase most of the natural frequencies, the lower ones being affected the most.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1989
Accession Number
ADA206969

Entities

People

  • James J. Zakrajsek
  • Raj Singh
  • Teik C. Lim

Organizations

  • National Aeronautics and Space Administration

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Aircrafts
  • Aluminum
  • Army Aviation
  • Ball Bearings
  • Bearings
  • Elements
  • Engineering
  • Finite Element Analysis
  • Frequency
  • Fuselages
  • Mechanical Engineering
  • Modal Analysis
  • Resonant Frequency
  • Shape
  • Transverse
  • Universities
  • Vibration

Readers

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