G.G. Choi, M. Agelastos, M.P. Mignolet, D.D. Liu

This paper addresses two specific problems relevant to the impact of internal friction on the flutter and post-flutter behavior of aeroelastic systems. First, a flat plate supporting a rigid disk through a torsional spring and friction is considered and its response to a uniform incompressible flow field is investigated. More specifically, the stability boundaries of the combined system are determined and the existence and characteristics of limit cycle oscillations are analyzed. Next, the effects of a second dissipation mechanism, a viscous damper placed in parallel to the friction element, is investigated on a simpler yet representative two-degree-of-freedom structural dynamic system. It is found that friction is generally, although not always, beneficial as it can reduce the amplitude of limit cycle oscillations and transform unstable responses into finite amplitude oscillations. However, friction may also have a detrimental effect by hindering damped relative motions (sticking problem) and provoking an earlier onset of instability for systems with relative motion as opposed to those that do not exhibit these motions (slipping problem).

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;

nonlinearity, friction, flutter

Bibliothek

2005