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Design, Modeling, and Flight Dynamics Analysis of Generic Lift-Offset Coaxial Rotor Configurations

Ashwani K. Padthe, Emily D. Glover, San Jose State University
Mark J.S. Lopez, Tom Berger, Eric L. Tobias, U.S. Army CCDC AvMC
Ondrej Juhasz, U.S. Naval Academy

May 10, 2022

https://doi.org/10.4050/F-0078-2022-17580

Abstract:
Lift-offset coaxial compound rotorcraft designs have been proposed for the U. S. Army Future Vertical Lift (FVL) programs. Without a need for the tail rotor and equipped with a pusher-propeller, the coaxial compound configuration is capable of achieving high airspeeds and perform maneuvers not feasible for the conventional rotorcraft. To facilitate an independent assessment of the lift-offset coaxial configurations by the U. S. Army, two designs are presented in this paper. Physics-based flight dynamic models are developed using open source data and implemented into the HeliUM-A comprehensive analysis code. On-axis frequency responses from the models are validated against available flightdata showing good agreement. The models are trimmed for a range of vehicle airspeeds, pitch angles, and rotor speeds. Trends in trim controls, hub loads, and power consumption are studied. Linearized time-invariant (LTI) models are extracted from the nonlinear HeliUM-A models. The LTI models are used to study trends in system eigenvalues, stability and control derivatives. Vehicle flight dynamics are examined through frequency response plots at various flight conditions.


Design, Modeling, and Flight Dynamics Analysis of Generic Lift-Offset Coaxial Rotor Configurations

  • Presented at Forum 78
  • 24 pages
  • SKU # : F-0078-2022-17580
  • Modeling and Simulation II

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Design, Modeling, and Flight Dynamics Analysis of Generic Lift-Offset Coaxial Rotor Configurations

Authors / Details:
Ashwani K. Padthe, Emily D. Glover, San Jose State University
Mark J.S. Lopez, Tom Berger, Eric L. Tobias, U.S. Army CCDC AvMC
Ondrej Juhasz, U.S. Naval Academy