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Adaptation of a modern medium helicopter (sikorsky s-76) to higher harmonic control
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Oleary, J. J. Davis, M. W. Kottapalli, S. B. R. |
| Copyright Year | 1985 |
| Description | Sikorsky Aircraft has performed analytical studies, design analyses, and risk reduction tests have been performed for Higher Harmonic Control (HHC) on the S-76. The S-76 is an 8 to 10,000 lb helicopter which cruises at 145 kts. Flight test hardware has been assembled, main servo frequency response tested and upgraded, aircraft control system shake tested and verified, open loop controllers designed and fabricated, closed loop controllers defined and evaluated, and rotors turning ground and flight tests planned for the near future. Open loop analysis shows that about 2 deg of higher harmonic feathering at the blade 75% radius will be required to eliminate 4P vibration in the cockpit. |
| File Size | 918820 |
| Page Count | 14 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19860005833 |
| Archival Resource Key | ark:/13960/t8kd6s77q |
| Language | English |
| Publisher Date | 1985-11-01 |
| Access Restriction | Open |
| Subject Keyword | Aircraft Stability And Control Dynamic Response Flight Tests Vibration Airframes Helicopters Computerized Simulation Harmonic Control Aeroelasticity Loads Forces Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
