Method of selectively decoupling solidborne noise, a...

Details Method of selectively decoupling solidborne noise, a... Method of selectively decoupling solidborne noise, a...

2006-08-09

2009-12-15

Ellis, Christopher P (Department: 3644)

Aeronautics and astronautics

Aircraft, heavier-than-air

Helicopter or auto-rotating wing sustained, i.e., gyroplanes

C244S00100R, C384S221000

Reexamination Certificate

active

07631835

ABSTRACT:
Solidborne noise and vibration is decoupled in a rotary wing aircraft by a laminated ball joint (15) for a suspension bar (13) of a transmission gearbox, the ball joint including at least two damper layers (19) dedicated to a frequency band for decoupling in the range 0 to 7000 Hz. For this purpose, the damper layers (19) and possibly also likewise dedicated interleaved layers (20) are given shape and/or dimension and/or physical-property parameters as a function of the frequency for decoupling in the determined frequency band.

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