Aeronautics and astronautics – Aircraft – heavier-than-air – Helicopter or auto-rotating wing sustained – i.e. – gyroplanes
Patent
1981-03-23
1982-12-28
Barefoot, Galen L.
Aeronautics and astronautics
Aircraft, heavier-than-air
Helicopter or auto-rotating wing sustained, i.e., gyroplanes
188378, 248554, 248638, B64C 2700, F16F 1510
Patent
active
043657710
ABSTRACT:
A helicopter transmission mounting structure is disclosed in which at least three decoupled inertial isolators (26,38,30,32) are connected to the transmission (12) to support the helicopter fuselage. Each of the inertial isolators (26,28,30,32) is mounted in the nodal plane of the transmission (12) to absorb inplane vibrations generated by a rotor blade and transmitted through a rotor mast (10). The inertial isolators (26,28,30,32) respond individually to applied vibrations which have predetermined frequencies and generate counteracting forces to reduce the amplitude of vibrations transmitted to the fuselage. In an alternative embodiment beam input links (134,136,138,140) are connected from the nodal plane of the transmission to inertial isolators (142,144,146,148). The beam input links (134,136,138,140) are connected to transmit only those forces parallel to the rotor mast (10).
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Barefoot Galen L.
Textron Inc.
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