A survey of research in helicopter higher harmonic control with plans for nearterm Naval Postgraduate School test
Carlsen, Jeffrey H.
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A survey of research in the area of helicopter vibration reduction through the use of higher harmonic bade pitch control is presented. Higher Harmonic Control (HHC) is an active vibration suppression system for helicopters. Vibration is reduced through feathering of helicopter rotor blades at (b-1)omega, bomega, and (b+1)omega harmonic relationships to reduce airframe vibrations at the blade passage frequency bomega where b is the number of blades and omega is the main rotor rotational speed. Research has been in the areas of blade stresses, vibrations, control systems HHC algorithms, and methods of actuation. HHC has also been reported to affect helicopter performance and main rotor noise. Also presented are preliminary plans for performance testing testing of a Higher Harmonic Control system by the Naval Postgraduate School on the U.S. Naval Academy whirl tower at Annapolis.
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Establishment of a remotely piloted helicopter test flight program for higher harmonic control research Scott, James Georg (Monterey, California: Naval Postgraduate School, 1990-06);An analytical research study was begun on a helicopter vibration reduction concept known as higher harmonic control (HHC). To supplement this research, a helicopter flight test program was established to generate flight ...
Baseline vibration measurements of remotely piloted helicopters for higher harmonic control research. Ransford, Kevin M. (Monterey, California. Naval Postgraduate School, 1991-12);The Department of Aeronautics and Astronautics at the Naval Postgraduate School (NPS) is conducting a research program in methods of higher harmonic control (HHC) for reduction of helicopter vibrations. The program at ...
McGovern, James Joseph (Monterey, California. Naval Postgraduate School, 1991-03);The Department of Aeronautics and Astronautics at the Naval Postgraduate School (NPS) is interested in extending the useful life of Naval helicopters. Recognizing the need to reduce vibrations caused by aerodynamic loads ...