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Low-Order Geometrically Nonlinear Aeroelastic Modeling and Analysis of the Pazy Wing Experiment

AIAA 2022-2313
Session: Aeroelastic Prediction Workshop II
Published Online:https://doi.org/10.2514/6.2022-2313
Abstract:

View Video Presentation: https://doi.org/10.2514/6.2022-2313.vid

The Third Aeroelastic Prediction Workshop Large Deflection Working Group is dealing with the analysis and experimentation of the Pazy wing, a very flexible wing developed for benchmark studies at the Technion -- Israel Institute of Technology. This work leverages the Pazy wing as the test case to study the ability of low-order structural and aerodynamic models to predict geometrically nonlinear aeroelastic behaviors associated with large deflections. The low-order beam structural model of the Pazy wing predicts its frequencies and static response with the same accuracy as the parent built-up finite element model while using much fewer degrees of freedom and showing higher numerical stability. The low-order aeroelastic model composed of the beam structural model coupled to strip theory with tip loss correction predicts static aeroelastic responses with the same accuracy as a higher-order model based on the vortex-lattice method; the predicted flutter onset shows errors up to 7.6% compared with reference numerical and experimental solutions due to the approximate treatment of three-dimensional unsteady aerodynamic effects. These results build toward the goal of obtaining appropriate-fidelity models for aeroelastic analysis of geometrically nonlinear wings to support the design of future highly energy-efficient aircraft.