I. Zentner, F. Poirion

The aim of this paper is to investigate the impact of random noise, as given by turbulent velocity fluctuations in the oncoming flow, on the domain of stability of aircraft. Indeed, stability of the coupled system aircraft/aerodynamics is a key issue in civil airplane manufacturing and it is well known that an aircraft subjected to a fluid flow (no turbulence) may exhibit flutter instability for a certain critical value of a flow parameter. But stability is also sensitive to multiplicative noise as given by atmospheric turbulence. When introducing such a random perturbation into the model, then we have to deal with random operators producing random output. However, we show that stability of such systems can be studied efficiently in the framework of random dynamical systems theory by means of Lyapunov exponents. In this paper, we show in a first time how our reduced order model of the fluid-structure interaction problem is constructed and subsequently present an effective numerical procedure for stability computations which can be utilised together with standard structural and aerodynamic codes.

International Forum on Aeroelasticity and Structural Dynamics, 2005, München

Conference Paper

englisch

21,0 x 29,7 cm, 13 Seiten

DGLR-Bericht, 2005, 2005-04, International Forum on Aeroelasticity and Structural Dynamics 2005; S.1-13; 2005; Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V., Bonn

NA

in getr. Zählung;

aeroelasticity, stability, flutter, lyapunov exponent

Bibliothek

2005