Wind blade vibration eliminator for helicopters
US4518313A · kind A · utility
Inventors
Key dates
| Filing date | Feb 25, 1982 |
| Grant date | May 21, 1985 |
| Priority date | — |
| Expiry date | Feb 25, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E10/72
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An improvement to a rotating blade is disclosed in a device that will apply variable moment forces to wind blades which are counter to the variable forces normally encountered in typical wind blades. The device consists of a gyro attached to the rotating blade and because of the torque force obtained by gyroscopic precession, the device will provide moment forces counter to normal blade wind forces. This invention shows a unique arrangement where the gyro is attached to the blade by a gyro positioner which adjusts the gyro's precessional rate. The gyro's precessional rate is varied with the blade's deflection or blade stress so that the gyro will impose a moment force counter to the cyclic deflection in the blade. Thus the device prevents or reduces the vibrational deflection and resultant stresses in the blades and its associated structures.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.