Beam Dampers for Skin Vibration and Noise Reduction in the 747

Abstract

A special constrained layer damped has been incorporated into the Boeing 747 upper deck fuselage structure. This damper replaces a rivetted stiffener which was installed to reduce noise levels inside the cabin. It has been found that the damper installation produced a noise reduction equal to that achieved by the stiffener and resulted in an $8000 per airplane cost savings and a 130 pound per airplane weight savings. A brief review is presented of the analysis and test that led to this design.

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Document Details

Document Type
Technical Report
Publication Date
Nov 01, 1984
Accession Number
ADP004721

Entities

People

  • R. N. Miles

Organizations

  • Boeing

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Adhesives
  • Aircrafts
  • Airframes
  • Airplanes
  • Boundary Layer
  • Cargo Aircraft
  • Commercial Aircraft
  • Frequency
  • Fuselages
  • Insulation
  • Laboratory Tests
  • Layers
  • Modal Analysis
  • Noise Reduction
  • Turbulent Boundary Layer
  • United States
  • Vibration

Readers

  • Acoustics.
  • Government Contracting/Procurement.
  • Structural Dynamics.