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Development, Simulation, and Flight Testing of Damage Tolerant Control Laws for the ADAPT™ Winged Compound Helicopter Scaled Demonstrator

Samuel J. Nadell, Tom Berger, US Army CCDC - AvMC
Alex DiJoseph, Eric Huang, Piasecki Aircraft Corporation

https://doi.org/10.4050/F-0079-2023-17963

Abstract:
Damage tolerant control (DTC) laws were developed for the Adaptive Digital Automated Pilotage Technology (ADAPT) Winged Compound Helicopter Scaled Demonstrator, a 10% scale version of the Piasecki X-49A, and tested in simulation and flight. The damage scenarios considered include failures of the aircraft's eight redundant actuators: left, right, and aft swashplate servos, Vectored Thrust Ducted Propeller (VTDP) RPM, rudder, left and right flaperons, and elevator. A pseudo-inverse control allocation scheme was used to reallocate control to the remaining actuators based on detection of a failed actuator. The paper covers discussion of the vehicle configuration, flight dynamics, control design, piloted simulation study to evaluate aircraft survivability and failure severity, and flight testing. The results show that DTC improved aircraft survivability and reduced failure severity, as measured by Sullivan Survivability and Integrated Failure Evaluation Scheme ratings, for three of the five damage scenarios tested in the piloted simulation study. Most notably, DTC enabled recovery after a left swashplate servo hardover that was unrecoverable with DTC off. DTC for this damage scenario was successfully tested in flight.


Development, Simulation, and Flight Testing of Damage Tolerant Control Laws for the ADAPT™ Winged Compound Helicopter Scaled Demonstrator

  • Presented at Forum 79 - Best Paper for this session
  • 25 pages
  • SKU # : F-0079-2023-17963
  • April 2024 Paper of the Month
    Advanced Vertical Flight

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Development, Simulation, and Flight Testing of Damage Tolerant Control Laws for the ADAPT™ Winged Compound Helicopter Scaled Demonstrator

Authors / Details:
Samuel J. Nadell, Tom Berger, US Army CCDC - AvMC
Alex DiJoseph, Eric Huang, Piasecki Aircraft Corporation