Acoustic Radiation Efficiency Models of a Simple Gearbox.

Abstract

Acoustic intensity measurements were conducted on a simple spur gear transmission in a welded steel housing. The radiation efficiency of the housing was computed from the intensity data for the first three harmonics of mesh frequency. Finite element and boundary element methods (FEM/BEM) were used jointly to model acoustics and dynamics of the top plate of the housing. For a simply supported elastic plate, reasonable agreement was achieved between experimental radiation efficiencies and those predicted with FEM/BEM. However, predictions of the housing characteristics were only partially successful. Four simple analytical models were examined to judge their ability to predict the radiation efficiency. These models do not simulate the modal characteristics of a gearbox; therefore their predictions yield only general trends. Discrepancies are believed to be related to inaccurate modeling of the excitation of the structure as well as to interactions between modes of vibration.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1996
Accession Number
ADA318757

Entities

People

  • Fred B. Oswald
  • Mark F. Jacobson
  • Rajendra Singh

Organizations

  • Glenn Research Center

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Acoustic Impedance
  • Acoustics
  • Boundaries
  • Boundary Element Methods
  • Computations
  • Frequency
  • Intensity
  • Measurement
  • Military Research
  • Motors
  • Noise
  • Power Spectra
  • Radiated Noise
  • Radiation
  • Resonant Frequency
  • Sidebands
  • Vibration

Fields of Study

  • Physics

Readers

  • Computational Modeling and Simulation
  • Plasma Physics / Magnetohydrodynamics
  • Tribology (the study of the boundary interaction between sliding surfaces, lubrication, wear and friction).