Accession Number:

ADP004721

Title:

Beam Dampers for Skin Vibration and Noise Reduction in the 747

Descriptive Note:

Corporate Author:

BOEING CO SEATTLE WA

Personal Author(s):

Report Date:

1984-11-01

Pagination or Media Count:

19.0

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.

Subject Categories:

  • Civilian Aircraft

Distribution Statement:

APPROVED FOR PUBLIC RELEASE