Adverse Aeroelastic Roll/Lateral Rotorcraft-Pilot Couplings Analysis

V Muscarello, Marilena Pavel, G Quaranta, Georges Tod, P Masarati, F Malburet

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

1 Citation (Scopus)


The paper investigates the basic mechanism of aeroservoelastic Pilot Assisted Oscillation phenomenon (PAO) about the roll axis due to the interaction with the 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 instability mechanism is analogous to the ‘air resonance’ phenomenon, in which the pilot’s involuntary action plays the role of the AFCS. Using robust stability analysis, the paper demonstrates that, in particular, the introduction of a gain and a time-delay between the stick motion and the servoactuator displacements may reduce the gain and phase margins of the pilotvehicle system. The mechanism of instability proves that the pilot biodynamics is participating to the destabilization of the system by firstly inputting energy directly into the flapping mode. This destabilizes the airframe roll motion which, in turn, causes lag motion imbalance.
Original languageEnglish
Title of host publication72nd Annual Forum of the American Helicopter Society
Subtitle of host publicationWest Palm Beach, USA
Number of pages15
Publication statusPublished - 2016
Event72nd 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 201619 May 2016
Conference number: 72


Conference72nd Annual Forum of the American Helicopter Society
Abbreviated titleAHS 72 Forum
Country/TerritoryUnited States
CityWest Palm Beach
Internet address


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