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Keynote: Paradigmatic experiments for flow-induced vibrations

Schewe, Günter (2011) Keynote: Paradigmatic experiments for flow-induced vibrations. In: Proceedings "IFASD 2011". IFASD 2011 - 15th International Conference on Aeroelasticity and Structural Dynamics, 26.-30. Juni 2011, Paris, Frankreich.

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Abstract

The initial, or general transient temporal behaviour of flow induced vibrations was studied particularly with regard to the question, up to which extend self-excited, flow-induced vibrations can be described by the Landau Equation. Three different cases were studied experimentally, using bodies with generic shape. The first case represents bluff bodies, a simplified section of the Tacoma bridge, which has a torsional degree of freedom. The second case is an two-dimensional airfoil in transonic flow having an heave and torsional degree of freedom. The third case is an elastic half-wing model, also investigated in transonic flow. It is shown that in all three cases, beyond the critical point and at small initial amplitude the temporal development of the oscillations up to the limit cycle i.e. the envelope of the measured time functions, agrees with the corresponding curve, given by the solution of the Landau equation. For the Tacoma section and the airfoil the same agreement was demonstrated for initial amplitudes much larger than the limit cycle one. In addition for both last cases the bifurcation behaviour was investigated and as outcome the Landau constants were determined. Finally it is tried to give an elementary physical explanation for the instability phenomenon.

Item URL in elib:https://elib.dlr.de/73377/
Document Type:Conference or Workshop Item (Speech, Paper)
Title:Keynote: Paradigmatic experiments for flow-induced vibrations
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Schewe, Günterguenter.schewe (at) dlr.deUNSPECIFIED
Date:2011
Journal or Publication Title:Proceedings "IFASD 2011"
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:flow-induced vibrations, Landau Equation, Tacoma bridge, transonic flutter, limit cycle oscillations, temporal development
Event Title:IFASD 2011 - 15th International Conference on Aeroelasticity and Structural Dynamics
Event Location:Paris, Frankreich
Event Type:international Conference
Event Dates:26.-30. Juni 2011
Organizer:3AF
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:other
DLR - Research area:Aeronautics
DLR - Program:L - no assignment
DLR - Research theme (Project):L - no assignment (old)
Location: Göttingen
Institutes and Institutions:Institute of Aeroelasticity
Deposited By: Erdmann, Daniela
Deposited On:22 Dec 2011 10:08
Last Modified:22 Dec 2011 10:41

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