01901nam 2200517Ia 450 991069807040332120090210090137.0(CKB)5470000002394297(OCoLC)302340104(EXLCZ)99547000000239429720090210d1989 ua 0engtxtrdacontentcrdamediacrrdacarrierReduction of blade-vortex interaction noise using higher harmonic pitch control[electronic resource] /Thomas F. Brooks ... [and others]Hampton, Va. :National Aeronautics and Space Administration, Langley Research Center ;US Army Aviation Systems Command, Aviation R & T Activity,[1989]17 pages digital, PDF fileNASA technical memorandum ;101624AVSCOM technical memorandum ;89-B-005Title from title screen (viewed Feb. 9, 2009)"July 1989."Includes bibliographical references (page 10).RotorsNoiseAcousticsnasatBlade-vortex interactionnasatControl systems designnasatNoise reductionnasatPitch (inclination)nasatPropeller noisenasatRotorsNoise.Acoustics.Blade-vortex interaction.Control systems design.Noise reduction.Pitch (inclination)Propeller noise.Brooks Thomas F1407638Langley Research Center.United States.Army Aviation Research and Technology Activity.GPOGPOBOOK9910698070403321Reduction of blade-vortex interaction noise using higher harmonic pitch control3500114UNINA