D. Biskri, R.M. Botez, S. Terrien, A. Rathe, N. Stathopoulos, M. Dikinson

Aeroservoelasticity (ASE) is the multidisciplinary study of interactions of control laws acting on active control systems with the flexible structure of a modern aircraft. This study is necessary for modern aircraft certification. In order to study the aeroservoelastic interactions on a Fly-by-Wire aircraft equipped with active control systems, one needs to study the interactions between the two disciplines: servocontrols (in the time domain) and aeroelasticity (in the frequency domain). Because of the fact that on a modern aircraft, we need to simulate the effects of the control laws on the flexible aircraft structure in real time, we need to approximate the unsteady aerodynamic forces from the frequency domain (aeroelasticity) into the Laplace domain (aeroservoelasticity) when servo-controls interact with the aircraft flexible structure. The unsteady aerodynamic forces are calculated for aeroelasticity studies in the frequency domain by use of the Doublet Lattice Method DLM in the subsonic regime for the business aircraft modeled by finite elements in Nastran. These forces are converted in the Laplace domain by various classical methods such as the Least Square (LS) and Minimum State (MS) methods. In this paper, we present a new mixed method based on the LS and MS combinations. We found that our method gives very good results with respect to the LS method and combines also the strengths of the two classical methods LS and MS. The results were presented for a business aircraft with 44 symmetric modes and 50 anti-symmetric modes.

International Forum on Aeroelasticity and Structural Dynamics, 2005, München

Conference Paper

englisch

21,0 x 29,7 cm, 9 Seiten

DGLR-Bericht, 2005, 2005-04, International Forum on Aeroelasticity and Structural Dynamics 2005; S.1-9; 2005; Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V., Bonn

NA

in getr. Zählung;

aerodynamics, aeroelasticity, structural dynamics

Bibliothek

2005