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Aeroelastic behavior of composite rotor blades with swept tips
Kuo-An Yuan, Peretz Friedmann P.,
Published in Publ by American Helicopter Soc, Alexandria, VA, United States
Volume: 2
Pages: 1039 - 1059
This paper presents an analytical study of the aeroelastic behavior of composite rotor blades with straight and swept tips. The blade is modeled by beam type finite elements. A single finite element is used to model the swept tip. The nonlinear equations of motion for the finite element model are derived using Hamilton's principle and based on a moderate deflection theory and accounts for: arbitrary cross-sectional shape, pretwist, generally anisotropic material behavior, transverse shears and out-of-plane warping. Numerical results illustrating the effects of tip sweep, anhedral and composite ply orientation on blade aeroelastic behavior are presented. It is shown that composite ply orientation has a substantial effect on blade stability. At low thrust conditions, certain ply orientations can cause instability in the lag mode. The flap-torsion coupling associated with tip sweep can also induce aeroelastic instability in the blade. This instability can be removed by appropriate ply orientation in the composite construction.
About the journal
JournalAnnual Forum Proceedings - American Helicopter Society
PublisherPubl by American Helicopter Soc, Alexandria, VA, United States