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Prediction of aeroelastic limit-cycle oscillations based on harmonic forced-motion oscillations

van Rooij, A.C.L.M. and Nitzsche, J. and Dwight, R.P. (2017) Prediction of aeroelastic limit-cycle oscillations based on harmonic forced-motion oscillations. AIAA Journal, 55 (10). American Institute of Aeronautics and Astronautics (AIAA). DOI: 10.2514/1.J055852 ISSN 0001-1452

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Official URL: https://arc.aiaa.org/doi/pdf/10.2514/1.J055852

Abstract

Aeroelastic limit-cycle oscillations (LCO) due to aerodynamic non-linearities are usually investigated using coupled fluid-structure interaction simulations in the time domain. These simulations are computationally expensive, especially if a large number of LCO solutions must be computed to study the Hopf bifurcation behaviour in the immediate surrounding of the flutter point. To facilitate such bifurcation parameter studies an adaptation of the well-known p-k flutter analysis method is proposed in this paper. In this frequency domain method, the first harmonic of the motion-induced unsteady aerodynamic forces is no longer assumed to be solely determined by constant-coefficient frequency response functions. Instead, the non-linear dependence on the oscillation amplitudes and the phase angle between the input degrees of freedom is additionally taken into account. Therefore, the first harmonic Fourier components of the aerodynamic forces are sampled and interpolated in advance. The LCO solution is then found iteratively. The proposed amplitude-dependent p-k method (ADePK) is applied to a classic two-degree-of-freedom spring-mounted airfoil system where the non-linear aerodynamic forces are computed from Euler simulations. Fluid-structure interaction simulations are performed for validation of the method. Both methods show good agreement. Furthermore, the ADePK method is shown to be a useful tool to rapidly study structural parameter variations.

Item URL in elib:https://elib.dlr.de/111793/
Document Type:Article
Title:Prediction of aeroelastic limit-cycle oscillations based on harmonic forced-motion oscillations
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
van Rooij, A.C.L.M.anouk.vanrooij (at) dlr.dehttps://orcid.org/0000-0001-8281-7441
Nitzsche, J.jens.nitzsche (at) dlr.deUNSPECIFIED
Dwight, R.P.delft university of technology, faculty of aerospace engineeringUNSPECIFIED
Date:16 June 2017
Journal or Publication Title:AIAA Journal
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:55
DOI :10.2514/1.J055852
Publisher:American Institute of Aeronautics and Astronautics (AIAA)
ISSN:0001-1452
Status:Published
Keywords:limit-cycle oscillations, aerodynamic non-linearities, fluid-structure interaction, p-k method, reduced order model (ROM)
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Simulation and Validation
Location: Göttingen
Institutes and Institutions:Institute of Aeroelasticity > Aeroelastic Simulations
Deposited By: van Rooij, Anouk
Deposited On:23 Oct 2017 11:11
Last Modified:08 Mar 2018 18:42

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