Torsional mode suppressor

Details Torsional mode suppressor Torsional mode suppressor

1984-02-13

1985-07-30

Casaregola, Louis J.

Power plants

Combustion products used as motive fluid

Multiple fluid-operated motors

60 39281, F02C 310, F02C 928

Patent

active

045313610

ABSTRACT:
Damping of a helicopter rotor drive train, the drive train including the free turbines of a gas turbine engine propulsion system, the aircraft main and tail rotors, and associated shafts and gears, is accomplished through active modulation of the fuel flow to the engine gas generator. The fuel flow is varied such that a transient torque will be developed by the free turbines which is opposite in phase to drive train resonances.

REFERENCES:
patent: 3006144 (1961-10-01), Arnett et al.
patent: 3292367 (1966-12-01), Bauger et al.
patent: 3520133 (1970-07-01), Loft et al.
patent: 3688495 (1972-09-01), Fehler et al.
patent: 4015426 (1977-04-01), Hobo et al.

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