A Method for Predicting Acoustically Induced Vibration in Transport Aircraft

Abstract

A method is set forth for predicting the acoustically induced structural vibration in transport category aircraft. Charts are presented which correlate third-octave random noise and vibration levels at various confidence levels, for the frequency range of 50 to 2500 Hertz. The prediction charts are based on measured data from modern transport aircraft and are presented for the normal direction, ground operation, and a reference structural mass and rigidity. Shell-type structure (fuselage, pods, fairings) and box-type structure (wing, horizontal/vertical stabilizer) are treated separately. Means are provided for predicting lateral and tangential vibration, vibration in pressurized cruise flight, and for correcting for changes in structural mass and rigidity. Application of the method to a hypothetical airplane design case is illustrated in an example.

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1974
Accession Number
ADA004215

Entities

People

  • Cecil W. Schneider
  • Harold W. Bartel

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Air Force
  • Aircraft Equipment
  • Aircrafts
  • Airframes
  • Airplanes
  • Frequency
  • Frequency Bands
  • Fuselages
  • Jet Transport Aircraft
  • Plastic Explosives
  • Sound Pressure
  • Spars
  • Structural Components
  • Surfaces
  • Transport Aircraft
  • Vehicles
  • Vibration

Fields of Study

  • Physics

Readers

  • Acoustics.
  • Aerospace Engineering
  • Structural Dynamics.