Aeroelasticity & Structural Dynamics in a Fast Changing World
17 – 21 June 2024, The Hague, The Netherlands
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Whirl flutter analysis using linearized propeller transfer matrices


Go-down ifasd2024 Tracking Number 18

Presentation:
Session: Rotary aeroelasticity 1
Room: Room 1.6
Session start: 13:30 Tue 18 Jun 2024

Christopher Koch   Christopher.koch@dlr.de
Affifliation: German Aerospace Center (DLR), Institute of Aeroelasticity

Topics: - Computational Aeroelasticity (High and low fidelity (un)coupled analysis methods:), - Rotorcraft Aeroelasticity (High and low fidelity (un)coupled analysis methods:)

Abstract:

The transfer-matrix (TM-) method for propeller whirl flutter analysis is based on frequency-domain transfer functions from propeller hub motion to loads, which are identified from time-domain propeller models. These transfer functions can be nonlinear with respect to frequency, e.g., due to unsteady aerodynamics. This paper presents a simplified version of the TM-method based on linearized transfer function compatible with legacy whirl flutter workflows based on propeller derivatives. It will present a comparison of whirl flutter results with a full aircraft configuration obtained using either fully frequency-dependent or linearized transfer matrices using various aerodynamic methods.