F. Poirion

Uncertainty effects on the stability of fluid-structure coupled systems have been investigated at ONERA for more than a decade. Stability of the coupled system aircraft/ aerodynamics is a key issue in civil airplane manufacturing. During the design stage of an airplane, many structural parameters are not clearly fixed nor known, but nevertheless the final project must comply to the various international certification regulations. One popular approach to deal with this problem is to model the parametric uncertainties through random variables. Then one has to study the stability of a random parameter dynamical system. After presenting the various steps developed at ONERA in order to construct an effective numerical procedure which can be utilized together with standard structural and aerodynamic codes by manufacturers, we focus on various models for introducing uncertainty in an elementary stiffness matrix. It is shown that a chaos polynomial representation of the matrix whose coefficients are estimated through Monte Carlo simulation yields a better approximation for the matrix and its eigenvalues than a Taylor expansion which is currently used in the literature. Thw method is then applied to an aircraft model.

International Forum on Aeroelasticity and Structural Dynamics, 2005, München

Conference Paper

englisch

21,0 x 29,7 cm, 12 Seiten

DGLR-Bericht, 2005, 2005-04, International Forum on Aeroelasticity and Structural Dynamics 2005; S.1-12; 2005; Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V., Bonn

NA

in getr. Zählung;

aeroelasticity, flutter

Bibliothek

2005