M.H.L. Hounjet, B.J.G. Eussen

Time-linearized aerodynamic methods which usually operate in the frequency domain are known to suffer from frequency limitations especially in the transonic speed regime. The paper shows that aerodynamic loads up to high frequencies can be accurately obtained by applying methods which are based on exponentially diverging motions. A polynomial fit is ma.de through the corresponding aerodynamic loads after which the fit is supposed to be valid also for general types of motion( analytical continuation). The convergence of iterative solvers in the aerodynamic methods is much improved, and a more than 50% reduction of computational cost may be achieved. It is further shown how wsting time-linearized methods which operate in the frequency domain can be modified to operate for diverging motions. Results of unsteady loads applications in 2-D and 3-D subsonic, transonic and supersonic flow are shown. Results of an application to a 3-D AGARD standard aeroelastic configuration in subsonic, transonic and supersonic flow are presented. Also a description is given of the method of data-fitting which has been used in the examples.

International Forum on Aeroelasticity and Structural Dynamics 1991, Aachen

Conference Paper

englisch

21,0 x 29,7 cm, 12 Seiten

DGLR-Bericht, 1991, 1991-06, International Forum on Aeroelasticity and Structural Dynamics 1991 Proceedings; S.54-65; 1991; Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V., Bonn

NA

aeroelasticity

Bestellbar

1991