Flutter is an important problem in modern technology engines. Despite significant research in the area of turbomachinery aeroelasticity, flutter instabilities still occur. The flutter suppression potential of dry friction damping with displacement-dependent friction forces is investigated. Bending-torsion coupling, aerodynamic coupling, and realistic aerodynamic damping terms are all considered. The total aeroelastic system is studied under compressible flow conditions and is modeled by a set of first-order differential equations in state-space form. Through time integration studies, it is found that the nondimensional flutter speed can be significantly increased by including displacement-dependent friction forces and by moving the location of the dry friction damper. This result strongly suggests that it may be possible to design the geometry and location of frictional interfaces on airfoils so that damping may be enhanced and flutter can be better controlled. Possible future applications might be in the area of turbine or fan and compressor blade systems.
Suppression of bending-torsion flutter through displacement-dependent dry friction damping
Die Unterdrückung von Biege-Torsions-Flatterschwingungen mit einem verformungsabhängigen Trockenreibungsdämpfer
AIAA Journal ; 37 , 1 ; 79-83
1999
5 Seiten, 6 Bilder, 1 Tabelle, 33 Quellen
Article (Journal)
English
Suppression of Bending-Torsion Flutter Through Displacement-Dependant Dry Friction Damping
British Library Conference Proceedings | 1996
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