| 摘要 |
PROBLEM TO BE SOLVED: To provide a method and an apparatus for reducing vibration in a helicopter structure having small parasitic mass, which prevents an accelerometer and its related wiring from sustaining accidental damage, and absorbs the vibration at its source or in the vicinity thereof. SOLUTION: The helicopter structure 10 is provided with a plurality of actuators 19 connected between a fuselage 12 capable of relative motion at an exciting frequency and a frame body 17. The actuators are continuously oscillated at a frequency substantially corresponding to the exciting frequency by a supply source 20 of a liquid pressurizing fluid. A sensor 21 attached to a rotor blade at a selected location is adapted to generate signals representative of dynamic changes at the respective selected location, a computer 22 processes the signals and provides output signals for controlling the phase and magnitude of applied forces generated by the actuators and for varying the phase and magnitude characteristics of the forces so as to compensate for changes in the dynamic characteristic of the rotating system, whereby the overall level of vibration in the fuselage structure is reduced. COPYRIGHT: (C)2007,JPO&INPIT
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