Fluid reaction surfaces (i.e. – impellers) – With means moving working fluid deflecting working member...
Patent
1996-08-02
1998-03-24
Kwon, John T.
Fluid reaction surfaces (i.e., impellers)
With means moving working fluid deflecting working member...
416 24, F04D 2918
Patent
active
057305811
ABSTRACT:
A rotor blade made of fiber-reinforced synthetic resin has a profile which, at least in the region of the blade tip is designed so as to be twistable by actuators about the rotor blade longitudinal axis. The torsion skin of the rotor blade in the region of the blade tip is designed anisotropically in the sense of a tension/torsion coupling and a controllable actuator, which acts in a longitudinal direction of the rotor blade upon the rotor blade tip, is disposed in the rotor blade spar. To achieve anisotropy, the torsion skin is a uni-directional winding having a winding angle of less than 45.degree. relative to the rotor blade longitudinal axis. The winding angle is dependent upon the force-to-displacement ratio of the actuator and may lie between 18.degree. and 40.degree.. In the region of the blade tip, the anisotropic torsion skin is disposed resting loosely on the rotor blade spar.
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Amerigo, Marc P. and Baeder, James D, "Feasibility of Arbitrary Pitching Motion Controlled by Piezoceramic Actuators to Reduce Blade-Vortex Interaction Noise." Presented to the American Helicopter Society 51st Annular Forum, Fort Worth, Texas on May 11, 1995.
Japanese Abstract M-1274, Patent Abstracts of Japan, vol. 16/No.299, Jul. 2, 1992.
Aviation Week & Space Technology, Apr. 20, 1987, pp.50-56.
Buter Andreas
Piening Matthias
Deutsche Forschungsanstalt fur Luft-und Raumfahrt e.V.
Kwon John T.
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