Method for suppressing vibration and acoustic signature in a tiltrotor aircraft
US8201772B2 · kind B2 · utility
15Cited by
13References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 11, 2008 |
| Grant date | Jun 19, 2012 |
| Priority date | — |
| Expiry date | Oct 19, 2028 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB64C2027/005
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A method is disclosed for suppressing an external acoustic signature of an aircraft having at least one pair of non-intermeshing multiple-blade rotors. During operation of the aircraft, the at least one pair of rotors are rotated in an asymmetrically indexed manner that causes the blades of one of each pair of rotors to be consistently out of phase from the blades of the other of each pair of rotors. The selected amount in degrees of asymmetrical indexing is equal to the desired phasing in degrees divided by a number of blades of one of the rotors.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.