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A new aeroelastic model for composite rotor blades with straight and swept tipsAn analytical model for predicting the aeroelastic behavior of composite rotor blades with straight and swept tips is presented. The blade is modeled by beam type finite elements along the elastic axis. 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. Tip sweep can induce aeroelastic instability by flap-twist coupling. Tip anhedral causes lag-torsion and flap-axial couplings, however, its effects on blade stability is less pronounced than the effect due to sweep. Composite ply orientation has a substantial effect on blade stability.
Document ID
19920051790
Document Type
Conference Paper
Authors
Yuan, Kuo-An (NASA Langley Research Center Hampton, VA, United States)
Friedmann, Peretz P. (NASA Langley Research Center Hampton, VA, United States)
Venkatesan, Comandur (California, University Los Angeles, United States)
Date Acquired
August 15, 2013
Publication Date
January 1, 1992
Subject Category
AIRCRAFT DESIGN, TESTING AND PERFORMANCE
Report/Patent Number
AIAA PAPER 92-2259
Meeting Information
AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference(Dallas, TX)
Funding Number(s)
CONTRACT_GRANT: NAG1-833
Distribution Limits
Public
Copyright
Other