Integrated Aerodynamic/dynamic/structural Optimization of Helicopter Rotor Blades Using Multilevel DecompositionNational Aeronautics and Space Administration, Langley Research Center, 1995 - Helicopters - 52 pages |
Common terms and phrases
50 Radial location 60 Cycle number aerodynamic airfoil blade planform blade radius box beam CAMRAD/JA centroid Chordwise bending stiffness converge coordination constraint coordination parameter Cycle number 70 drag coefficient EIzz Extensional stiffness feasible design Flapwise bending stiffness Flapwise Chordwise Torsional flight conditions frequencies Helicopter Rotor IADS procedure Initial and final Langley Research Center lb-ft² level design variables level objective function Lower level attainable lower level constraint lower level design lower level objective lower level optimization lower level stiffnesses lumped areas matched stiffnesses moments of inertia multilevel decomposition NASA nondimensional optimization procedure point of taper power required retreating side Root chord shown in figure single-level optimization slug/ft m3 structural subproblem taper initiation Taper ratio Torsional stiffness U.S. Army upper and lower upper level analysis upper level design upper level objective upper level optimization Upper level required upper level stiffnesses Von Mises stress wall thicknesses Young's modulus