Beam Dampers for Skin Vibration and Noise Reduction in the 747
BOEING CO SEATTLE WA
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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.
- Civilian Aircraft