Modal Simulation of Gearbox Vibration with Experimental Correlation

Abstract

A newly developed global dynamic model was used to simulate the dynamics of a gear noise rig at NASA Lewis Research center. Experimental results from the test rig were used to verify the analytical model. In this global dynamic model, the number of degrees of freedom of the system are reduced by transforming the system equations of motion into modal coordinates. The vibration of the individual gear-shaft systems are coupled through the gear mesh forces. A three-dimensional, axial-lateral coupled, bearing model was used to couple the casing structural vibration to the gear-rotor dynamics. The coupled system of modal equations is solved to predict the resulting vibration at several locations on the test rig. Experimental vibration data was measured at several running speeds. This experimental vibration data was compared to the predictions of the global dynamic model. There is excellent agreement between the vibration results from analysis and experiment.... Aircraft transmissions, Vibration, Gearbox.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1992
Accession Number
ADA260134

Entities

People

  • Fred B. Oswald
  • Fred K. Choy
  • James J. Zakrajsek
  • Yeefeng F. Ruan

Organizations

  • National Aeronautics and Space Administration

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Aeronautics
  • Aircrafts
  • Army Aviation
  • Dynamic Loads
  • Dynamics
  • Equations
  • Equations Of Motion
  • Frequency
  • Gear Noise
  • Gears
  • Measurement
  • Mechanical Engineering
  • Modal Analysis
  • Resonant Frequency
  • Teeth
  • Three Dimensional
  • Vibration

Readers

  • Computational Modeling and Simulation
  • Structural Dynamics.
  • Tribology (the study of the boundary interaction between sliding surfaces, lubrication, wear and friction).