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System Identification and Stitched Modeling of the ADAPT™ Winged Compound Helicopter Scaled Demonstrator

Samuel J. Nadell, Tom Berger, Mark J.S. Lopez, U.S. Army DEVCOM AvMC
Christopher DiMarco, Piasecki Aircraft Corporation

May 10, 2022

https://doi.org/10.4050/F-0078-2022-17576

Abstract:
Frequency-domain system identification was performed for the ADAPT™ Winged Compound Helicopter Scaled Demonstrator, a 10% scale version of the Piasecki X-49A, at four flight conditions spanning its flight envelope. Since the aircraft has eight redundant control effectors – lateral cyclic, longitudinal cyclic, collective, Vectored Thrust Ducted Propeller (VTDP) RPM, rudder, differential flaperon, symmetric flaperon, and elevator – and exhibits a large amount of inter-axis coupling, the Joint Input-Output (JIO) Method was used for system identification in addition to the Direct Method. Based on the identified frequency responses, a hybrid model structure, which explicitly includes the coupled fuselage-rotor flapping dynamics and a first-order model for VTDP RPM lag, was used. State-space models were identified at each flight condition, and combined with trim data to form a full flight envelope stitched simulation model. A detailed analysis of the trends of the stitched model trim, stability and control derivatives, eigenvalues, and frequency responses was performed.


System Identification and Stitched Modeling of the ADAPT™ Winged Compound Helicopter Scaled Demonstrator

  • Presented at Forum 78
  • 28 pages
  • SKU # : F-0078-2022-17576
  • Modeling and Simulation I

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System Identification and Stitched Modeling of the ADAPT™ Winged Compound Helicopter Scaled Demonstrator

Authors / Details:
Samuel J. Nadell, Tom Berger, Mark J.S. Lopez, U.S. Army DEVCOM AvMC
Christopher DiMarco, Piasecki Aircraft Corporation