Instability Mechanism of Roll/Lateral Biodynamic Rotorcraft–Pilot Couplings
| Autor: | Giuseppe Quaranta, François Malburet, Marilena D. Pavel, Vincenzo Muscarello, Pierangelo Masarati, Georges Tod, Julien Gomand |
|---|---|
| Přispěvatelé: | Dipartimento di Scienze e Tecnologie Aerospaziali [Milano] (DAER), Politecnico di Milano [Milan] (POLIMI), Arts et Métiers Paristech ENSAM Aix-en-Provence, Laboratoire d’Ingénierie des Systèmes Physiques et Numériques (LISPEN), Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM), Faculty of Aerospace Engineering [Delft], Delft University of Technology (TU Delft) |
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Physics
020301 aerospace & aeronautics 0209 industrial biotechnology Oscillation Rotor (electric) Work (physics) 02 engineering and technology Degrees of freedom (mechanics) Sciences de l'ingénieur Instability Body roll law.invention Mechanism (engineering) [SPI]Engineering Sciences [physics] 020901 industrial engineering & automation 0203 mechanical engineering Control theory law Flapping |
| Zdroj: | Journal-American Helicopter Society Journal-American Helicopter Society, American Helicopter Society Inc, 2018, 63 (2), pp.1-13. ⟨10.4050/jahs.63.022004⟩ |
| ISSN: | 0002-8711 |
| Popis: | International audience; The paper investigates the basic mechanism of aeroservoelastic pilot-assisted oscillation about the roll axis due to the interaction with pilot's arm biomechanics. The motivation stems from the observation that a rotor imbalance may occur as a consequence of rotor cyclic lead–lag modes excitation. The work shows that the instability mechanism is analogous to air resonance, in which the pilot's involuntary action plays the role of the automatic flight control system. Using robust stability analysis, the paper shows how the pilot's biodynamics may involuntarily lead to a roll/lateral instability. The mechanism of instability proves that the pilot biodynamics is participating in the destabilization of the system by transferring energy, i.e., by producing forces that do work for the energetically conjugated displacement, directly into the flapping mode. This destabilizes the airframe roll motion, which, in turn, causes lead–lag motion imbalance. It is found that, depending on the value of the time delay involved in the lateral cyclic control, the body couples with rotor motion in a different way. In the presence of small or no time delays, body roll couples with the rotor through the lead–lag degrees of freedom. The increase of the time delay above a certain threshold modifies this coupling: The body no longer couples with the rotor through lead–lag but directly through flap motion. |
| Databáze: | OpenAIRE |
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