Helicopter Transmission Vibration and Noise Reduction Program

Abstract

A combined analytical and test program has been performed to develop a method for analytically determining the vibration and noise characteristics of a helicopter transmission. This effort included formulation of the necessary analytical method, validation of this method through direct comparison with test data, and use of the method to predict the effects of various transmission design changes. The analytical method formulated in this program makes use of available techniques for predicting gear-mesh-induced excitations. These techniques have been expanded to include a more rigorous treatment of spiral bevel and helical gear induced mesh excitations. Response of the dynamic system is predicted using a coupled torsion and bending analysis of the gearshafts, and includes the effects of bearing and case dynamics. Predicted case surface response is used directly to calculate radiated sound power.

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1977
Accession Number
ADA042457

Entities

People

  • Alex Berman
  • Michael A. Bowes
  • Nicholas Giansante
  • Robert B. Bossler Jr.

Tags

Communities of Interest

  • Advanced Electronics
  • Air Platforms
  • Energy and Power Technologies
  • Ground and Sea Platforms

DTIC Thesaurus Topics

  • Accuracy
  • Acoustic Impedance
  • Computers
  • Data Acquisition
  • Data Reduction
  • Differential Equations
  • Dynamic Response
  • Elastic Properties
  • Measurement
  • Military Research
  • Modulus Of Elasticity
  • Noise Reduction
  • Power Supplies
  • Resonant Frequency
  • Sound Pressure
  • Strain Gages
  • Test And Evaluation

Fields of Study

  • Physics

Readers

  • Calculus or Mathematical Analysis
  • Computational Fluid Dynamics (CFD)
  • Tribology (the study of the boundary interaction between sliding surfaces, lubrication, wear and friction).