Stiffness Characteristics of Composite Rotor Blades With Elastic CouplingsNational Aeronautics and Space Administration, Langley Research Center, 1997 - Composite materials - 48 pages |
Common terms and phrases
aeroelastic airfoil antisymmetric laminate construction balsa spar core baseline 1 blade baseline design Belf bending stiffness bending-twist coupling blade cross section blade designs blade stiffness blade with antisymmetric blade with symmetric chord lengths chord wise classical beam stiffnesses composite blade composite material composite rotor blades core material coupled stiffness coupling and stiffness cross-section analysis dimensional extension-twist coupling parameter finite-element Flapwise stiffness ratio Flapwise-bending stiffness ratio flapwise-bending-twist coupling parameter flexural stiffness ratio function of extension-twist function of flapwise-bending-twist function of ply ground resonance increasing the spar laminate design laminate variations Langley Research Center lb-in² Lines of constant neutral axis nondimensional coupled plies contributing pling ply angle ply orientation angle present study rotor blade cross skin and spar So)sp sp Figure spar width stiffness ratios versus symmetric laminate construction Torsional stiffness ratio Trends caused twist rate variations of spar wise-bending-twist coupling Young's modulus