Dual higher harmonic control (HHC) for a counter-rotating, coaxial rotor system
US7648338B1 · kind B1 · utility
36Cited by
9References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 14, 2006 |
| Grant date | Jan 19, 2010 |
| Priority date | — |
| Expiry date | Jan 17, 2028 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T50/30
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A dual, counter-rotating, coaxial rotor system provides individual control of an upper rotor system and a lower rotor system. The lower rotor control system and the upper rotor control system provide six controls or “knobs” to minimize or theoretically eliminate airframe vibration. In a dual, counter-rotating, coaxial rotor system, application of a HHC system to the two rotor systems individually but located on the common axis, will yield essentially complete vibration reduction because the 6 controls will suppress the 6 loads.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.