M. Karpel, C.D. Wieseman

Time domain aeroelastlc equations of motion are formulated in a way that allows large local structural variations with a low-order model where the modes that serve as generalized coordinates do not change. Free-free vibration modes are first calculated for a nominal finite-element model loaded with relatively large fictitious masses located at the area of structural variations. These modes and associated oscillatory aerodynamic force coefficient matri ces are used to construct a time-domain model for a basic aeroelastic case where the flcti tious mass contribution to the generalized mass matrix ls removed. High-accuracy aeroelastic investigations of the effects of structural variations can then be performed by simply introducing stiffness and damping coupling terms. It is shown that the number of modes required for the investigation of large stiffness variations is substantially lower than that required when fictitious masses are not used and only slightly larger than the number of modes required for direct aeroelastic analysis of a single structural case.

International Forum on Aeroelasticity and Structural Dynamics 1991, Aachen

Conference Paper

englisch

21,0 x 29,7 cm, 7 Seiten

DGLR-Bericht, 1991, 1991-06, International Forum on Aeroelasticity and Structural Dynamics 1991 Proceedings; S.364-370; 1991; Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V., Bonn

NA

aeroelasticity

Bestellbar

1991