Reference : A time-frequency technique for the stability analysis of impulse responses from nonli...
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Engineering, computing & technology : Aerospace & aeronautics engineering
A time-frequency technique for the stability analysis of impulse responses from nonlinear aeroelastic systems
Dimitriadis, Grigorios mailto [Université de Liège - ULiège > Département d'aérospatiale et mécanique > Interactions Fluide-Structure - Aérodynamique expérimentale >]
Cooper, J. E. [University of Manchester > School of Engineering > > >]
Proceedings of the 2001 International Forum on Aeroelasticity and Structural Dynamics
Associacion de Ingenieros Aeronauticos de Espana
International Forum on Aeroelasticity and Structural Dynamics, IFASD 2001
du 5 juin 2001 au 7 juin 2001
CEAS Council of European Aerospace Societies
[en] Aeroelasticity ; Structural dynamics ; Time-varying systems ; Linearization ; Short Time Fourier Transform
[en] A time-frequency method is proposed for the analysis of response time histories
from nonlinear aeroelastic systems. The approach is based on a time-varying curve-fit of the
Short Time Fourier Transform of the impulse response. It is shown that the method can be
used in order to obtain a clear picture of the sub-critical stability of a number of aeroelastic
systems with a variety of structural and aerodynamic nonlinearities. Additionally, frequency
and amplitude information can be obtained for both the linear and nonlinear signatures of the
response signals in the sub and post-critical regions. Finally, it is shown that, given certain
types of nonlinear functions, subcritical damping trends can be extrapolated to predict
bifurcation airspeeds.
Researchers ; Professionals

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