Accession Number ADA566028
Title Evaluation of Rotor Structural and Aerodynamic Loads Using Measured Blade Properties.
Publication Date Sep 2012
Media Count 15p
Personal Author B. H. Lau J. W. Lim S. N. Jung W. Johnson Y. You
Abstract The structural properties of Higher harmonic Aeroacoustic Rotor Test (HART I) blades have been measured using the original set of blades tested in the wind tunnel in 1994. A comprehensive rotor dynamics analysis is performed to address the effect of the measured blade properties on airloads, blade motions, and structural loads of the rotor. The measurements include bending and torsion stiffness, geometric offsets, and mass and inertia properties of the blade. The measured properties are correlated against the estimated values obtained initially by the manufacturer of the blades. The previously estimated blade properties showed consistently higher stiffnesses, up to 30% for the flap bending in the blade inboard root section. The measured offset between the center of gravity and the elastic axis is larger by about 5% chord length, as compared with the estimated value. The comprehensive rotor dynamics analysis was carried out using the measured blade property set for HART I rotor with and without HHC (Higher Harmonic Control) pitch inputs. A significant improvement on blade motions and structural loads is obtained with the measured blade properties.
Keywords Aerodynamic loading
Aerodynamic noise
Anechoic chambers
Flaps(Control surfaces)
Higher harmonic control aeroacoustic rotor test
Rotor blades
Structural properties
Wind tunnel tests

Source Agency Non Paid ADAS
NTIS Subject Category 51C - Aircraft
46A - Acoustics
Corporate Author Army Research Development and Engineering Command, Ames Research Center, Moffett Field, CA. Aviation Aeroflight Dynamics Directorate.
Document Type Technical report
Title Note Conference paper.
NTIS Issue Number 1306
Contract Number N/A

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