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Generation and Calibration of Linear Models of Aircraft with Highly Coupled Aeroelastic and Flight DynamicsThe lightweight structures and unconventional configurations being considered for the next generation of aircraft mean that any effort to predict or control the flight dynamics is impacted by the structural dynamics. One of the most severe forms of coupling between aeroelasticity and flight dynamics is an instability called body freedom flutter. The existing tools often assume a relatively weak effect of structural dynamics on the flight dynamics, and are therefore incapable of modeling strong interactions like body freedom flutter. A method of combining different sources of data traditionally used for aeroelasticity and flight dynamics is described by reconciling many of the differences between these models. By building upon past modeling efforts, a level of familiarity in the approach is achieved. Generally the differences from the traditional approaches are subtle but significant. The traditional frequency domain flutter model in a modal coordinate system is converted to a form consistent with a time domain flight dynamics model. The time domain rational function approximation about a non-inertial coordinate system and the unique constraints for the conversion between the inertial and non-inertial coordinate systems are discussed. A consistent transformation of the states of aeroelastic models to flight dynamics models is derived, which enables the integration of data from higher fidelity computational fluid dynamics models or wind-tunnel testing. The present method of integrating multidisciplinary data was used to create models that compare well with X-56A flight-test data, including conditions past the flutter speed.
Document ID
20200000419
Acquisition Source
Armstrong Flight Research Center
Document Type
Conference Paper
Authors
Ouellette, Jeffrey (NASA Armstrong Flight Research Center Edwards, CA, United States)
Valdez, Felipe D. (NASA Armstrong Flight Research Center Edwards, CA, United States)
Date Acquired
January 16, 2020
Publication Date
January 6, 2020
Subject Category
Aircraft Stability And Control
Report/Patent Number
AFRC-E-DAA-TN75452
Meeting Information
Meeting: AIAA SciTech Forum 2020
Location: Orlando, FL
Country: United States
Start Date: January 6, 2020
End Date: January 10, 2020
Sponsors: American Institute of Aeronautics and Astronautics (AIAA)
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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