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

van Rooij, A.C.L.M. and Nitzsche, Jens and Dwight, R.P. (2015) Prediction of aeroelastic limit-cycle oscillations based on harmonic forced motion oscillations. International Forum on Aeroelasticity and Structural Dynamics (IFASD), 28. Juni - 02. Juli 2015, Sankt Petersburg, Russland.

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Aeroelastic limit-cycle oscillations due to aerodynamic non-linearities are usually investigated using coupled fluid-structure interaction simulations in the time domain. These simulations can become computationally expensive, especially if the global bifurcation behaviour is of interest. To reduce the computational effort of parameter studies, an extension of the well-known p-k method is developed. In this frequency domain method, the aerodynamic forces and moments are now not only dependent on the frequency, but also on the oscillation amplitudes and the phase angle between the degrees of freedom. The first harmonic components of the aerodynamic forces are interpolated in the parameter space applying response surface modelling. The limit-cycle oscillation amplitude and mode shape are then found iteratively. The amplitude-dependent p-k method is verified and validated using an analytical testcase; the two-degree-of-freedom van der Pol oscillator. Excellent agreement with the time domain solution and the analytical solution is obtained. The amplitude-dependent p-k method is then applied to a two-degree-of-freedom airfoil system where the aerodynamic forces are computed from Euler simulations. Fluid-structure interaction simulations are performed for validation of the method. Both methods show good agreement in the bifurcation behaviour of the limit-cycle oscillation amplitude and mode shape.

Item URL in elib:https://elib.dlr.de/101374/
Document Type:Conference or Workshop Item (Speech)
Title:Prediction of aeroelastic limit-cycle oscillations based on harmonic forced motion oscillations
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
van Rooij, A.C.L.M.UNSPECIFIEDhttps://orcid.org/0000-0001-8281-7441UNSPECIFIED
Nitzsche, JensUNSPECIFIEDhttps://orcid.org/0000-0002-2742-7368UNSPECIFIED
Dwight, R.P.Delft University of Technology, Faculty of Aerospace EngineeringUNSPECIFIEDUNSPECIFIED
Date:July 2015
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:limit-cycle oscillations, aerodynamic non-linearities, fluid-structure interaction, p-k method
Event Title:International Forum on Aeroelasticity and Structural Dynamics (IFASD)
Event Location:Sankt Petersburg, Russland
Event Type:international Conference
Event Dates:28. Juni - 02. Juli 2015
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 (old)
Location: Göttingen
Institutes and Institutions:Institute of Aeroelasticity > Aeroelastic Simulations
Deposited By: van Rooij, Anouk
Deposited On:22 Dec 2015 15:22
Last Modified:29 Mar 2023 00:25

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