Piezoelectric helicopter blade flap actuator

Details Piezoelectric helicopter blade flap actuator Piezoelectric helicopter blade flap actuator

1989-07-26

1993-07-06

Look, Edward K.

Fluid reaction surfaces (i.e., impellers)

Rotary skin friction type

416 39, B64C 2300

Patent

active

052248267

ABSTRACT:
Electrically deformable material such as piezoelectric material is used to deform a deflectable flap on an airfoil such as a helicopter blade. The electrically deformable material is controlled to deflect the flap in a manner to control vibrations transmitted from a helicopter blade to the helicopter air frame. In a preferred embodiment, the electrically deformable material and mechanical linkages are segmented along the length of the rotor blade. In this way, differential actuation of the deformable elements results in variable flap deflections along the length of the rotor.

REFERENCES:
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patent: 3930626 (1976-01-01), Croswell, Jr.
patent: 4235397 (1980-11-01), Compton
patent: 4461611 (1984-07-01), Michel
patent: 4514143 (1985-04-01), Campbell
R. E. Duffy, et al., "A Theoretical and Experimental Study of the Snap-Through Airfoil and its Potential as a Higher Harmonic Control Device," Jan. 11-Jan. 14, 1988.
E. F. Crawley, "Induced Strain Actuation of Isotropic and Anisotropic Plates", Apr. 16, 1989.
Edward F. Crawley, et al., "Feasibility Analysis of Piezoelectric Devices" Jan. 1988.
Edward F. Crawley, et al., "Use of Piezoelectric Actuators as Elements of Intelligent Structures" Jan. 1987.

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