Abstract
A new technique to reduce the main rotor hub forces and moments at high speed maneuvers is proposed. The main working principle is a mechanical gearing ratio that distributes pitch commands from the (auto)pilot over main rotor cyclic pitch and the horizontal stabilizer incidence angle. The optimal gearing ratio is determined by the weighted pseudo inverse method. The system is analyzed with a nonlinear simulation model of the UH-60A Black Hawk helicopter. Results demonstrate that the main rotor shaft bending moment can be reduced by more than 50% for high speed pitch maneuvers whilst maintaining almost identical handling qualities as compared to the conventional method of control. All other hub forces and moments are also reduced significantly. The method also works effectively in off-design conditions. A safety analysis indicates that the system is safe for three failure cases considered. In the evaluation of the proposed system, a new handling qualities metric called flight path bandwidth is proposed.
Original language | English |
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Title of host publication | 72nd Annual Forum of the American Helicopter Society |
Subtitle of host publication | West Palm Beach, USA |
Number of pages | 12 |
Publication status | Published - 2016 |
Event | 72nd Annual Forum of the American Helicopter Society: Leveraging Emerging Technologies for Future Capabilities - Palm Beach County Convention Center, West Palm Beach, United States Duration: 17 May 2016 → 19 May 2016 Conference number: 72 https://vtol.org/events/forum-72 |
Conference
Conference | 72nd Annual Forum of the American Helicopter Society |
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Abbreviated title | AHS 72 Forum |
Country/Territory | United States |
City | West Palm Beach |
Period | 17/05/16 → 19/05/16 |
Internet address |