Helicopter blades may be conveniently modeled as initially curved and twisted anisotropic beams. The cross-sectional properties of the equivalent beam model directly affect the vibration characteristics and aeroelastic response of the blade. Because of manufacturing uncertainties, however, carefully-tailored sectional stiffnesses of composite blades may vary over a certain range. In order to reduce the resulting variability of cross-sectional properties, this paper proposes a probabilistic design procedure for composite blades. The effects of geometric uncertainty and composite material property variability on the cross-sectional properties of composite rotor blades are investigated. Material properties and geometric parameters are considered as random variables; and a probabilistic model for the crosssectional properties of blades, caused by geometric and material property variability, is built by Monte Carlo simulation. The statistical information obtained from the simulation is then incorporated into the cross-sectional design optimization. The optimization includes constraints associated with strength criteria and bounds on the variation of stiffness constants and shear center location.
Probabilistic design optimization of composite rotor blades
2008
13 Seiten, 34 Quellen
Conference paper
English
Probabilistic Design Optimization of Composite Rotor Blades
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