Method and apparatus for reducing vibration of a helicopter fuselage
US4819182A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 4, 1987 |
| Grant date | Apr 4, 1989 |
| Priority date | — |
| Expiry date | Feb 4, 2007 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB64C2027/002
- WIPO fieldTransport
- WIPO sectorMechanical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.