Helicopter blade vortex interaction noise reducing method and device
US7757991B2 · kind B2 · utility
2Cited by
10References
19Claims
0Family size
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Key dates
| Filing date | Feb 28, 2006 |
| Grant date | Jul 20, 2010 |
| Priority date | — |
| Expiry date | Feb 25, 2029 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T50/30
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
In a blade vortex interaction (BVI) noise reduction system for a helicopter a rotor blade, a tab is movable via an actuator from a first position, wherein the tab is within the blade, to a second position, wherein the tab extends outwardly from a trailing edge of the rotor blade. The actuator is operated so that the tab advances and retreats in response to rotating timing of the rotor blade, to reduce the BVI noise of the rotor blade.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.