초록 ▼

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

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.

대표청구항 ▼

A method of reducing vibration of a structure comprises the steps of connecting a plurality of actuators between parts of the structure capable of relative motion at an exciting frequency, continuously oscillating the plurality of actuators at a frequency substantially corresponding to the exciting

A method of reducing vibration of a structure comprises the steps of connecting a plurality of actuators between parts of the structure capable of relative motion at an exciting frequency, continuously oscillating the plurality of actuators at a frequency substantially corresponding to the exciting frequency, generating signals representative of dynamic accelerations at a plurality of locations on the structure and feeding said signals to on board processing means providing output signals for controlling the phase and magnitude of applied forces generated by the actuators and for varying the phase and magnitude characteristics of said forces so as to compensate for changes in structure dynamics whereby the overall level of structural vibration is reduced.