Aeronautics and astronautics – Aircraft – heavier-than-air – Helicopter or auto-rotating wing sustained – i.e. – gyroplanes
Patent
1992-04-16
1994-05-10
Focarino, Margaret A.
Aeronautics and astronautics
Aircraft, heavier-than-air
Helicopter or auto-rotating wing sustained, i.e., gyroplanes
244 1N, 244 1711, 188379, 74606R, 74572, 74574, B64C 2700
Patent
active
053101375
ABSTRACT:
An active noise control (ANC) system for a helicopter that is operative to effectively nullify one or more high frequency vibrations emanating from the main transmission gearbox thereof at the gearbox/airframe interface, thereby significantly reducing the interior noise levels of the helicopter, that is design optimized to minimize the number of actuators required, and that is design optimized to minimize contamination forces arising from operation of the system actuators. The ANC system includes modified transmission beams that are mechanically stiffened to function as rigid bodies with respect to the one or more of the high frequency vibrations, a plurality of actuators disposed in combination with the modified transmission beams, a plurality of sensors disposed in combination with the modified transmission beams in a collinear, spaced apart functional correlation with respective actuators, and controllers interconnecting individual actuators with respective functionally correlated sensors.
REFERENCES:
patent: 2361071 (1944-10-01), Vang
patent: 3566993 (1971-03-01), Leatherwood et al.
patent: 4362281 (1982-12-01), Cresap et al.
patent: 4562589 (1985-12-01), Warnaka et al.
patent: 4566118 (1986-01-01), Chaplin et al.
patent: 4600863 (1986-07-01), Chaplin et al.
patent: 4715559 (1987-12-01), Fuller
patent: 4720060 (1988-01-01), Yana
patent: 4735296 (1988-04-01), Pinson
patent: 4795123 (1989-01-01), Forward et al.
patent: 4819182 (1989-04-01), King et al.
patent: 4869474 (1989-09-01), Best et al.
patent: 4974794 (1990-12-01), Aubry et al.
patent: 5154371 (1992-10-01), Grant et al.
patent: 5190244 (1993-03-01), Yana
Sheehy Thomas W.
Welsh William A.
Yoerkie, Jr. Charles A.
Ellis Christopher P.
Focarino Margaret A.
Radke Terrance J.
United Technologies Corporation
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