Boots – shoes – and leggings
Patent
1987-02-04
1989-04-04
Lall, Parshotam S.
Boots, shoes, and leggings
244 1711, 248566, F16F 1510, B04D 4700
Patent
active
048191825
ABSTRACT:
This invention relates to a method and apparatus for reducing vibration of a helicopter fuselage. The apparatus comprises a plurality of actuators interconnecting parts of the helicopter structure capable of relative motion at an exciting frequency, means to continuously oscillate the actuators at a frequency corresponding to the exciting frequency, a plurality of accelerometers attached to the fuselage for generating signals representative of fuselage dynamic accelerations, and processing means for processing said signals and providing output signals for controlling the phase and magnitude of operation of the actuators. In a described embodiment, one of the relatively movable parts comprises a raft structure carrying the gearbox and engines and attached to the fuselage by a resilient attachment adjacent each of its four corners.
REFERENCES:
patent: 4311213 (1982-01-01), Desjardins et al.
patent: 4365770 (1982-12-01), Mard et al.
patent: 4483425 (1984-11-01), Newman
patent: 4546960 (1985-10-01), Abrams et al.
patent: 4699257 (1987-10-01), Lloyd
Morison et al., "Comparison of Optimized Active and Passive Vibration Absorbers", 1973, Conference of the Automotive Control Council, pp. 932-938.
Hughes Christopher I.
King Stephen P.
Black Thomas G.
Lall Parshotam S.
Westland plc
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