Aeronautics and astronautics – Aircraft sustentation – Sustaining airfoils
Patent
1995-11-20
1997-09-02
Kashnikow, Andres
Aeronautics and astronautics
Aircraft sustentation
Sustaining airfoils
244123, 244133, 244201, 114140, B64C 318, B64C 344, B64C 904, B63B 338
Patent
active
056622945
ABSTRACT:
A pliant, controllable contour control surface comprising a first flexible facesheet formed to a first initial contour of the control surface, and a second flexible facesheet formed to a second initial contour of the control surface. The first and second facesheets each have a set of prestrained shape memory alloy tendons embedded therein, extending from a leading edge to a trailing edge of the control surface. Each set of the shape memory alloy tendons is separately connected to a controlled source of electrical current such that tendons of the first and second flexible facesheets can be selectively heated in an antagonistic, slack-free relationship, to bring about a desired modification of the configuration of the control surface. A computer based control system is utilized for maintaining a constant temperature of the antagonists to establish conditions conducive to the stress induced transformation from austenite to martensite, accomplished by causing constant current to flow through the antagonists. Proportional/integral (PI) control is utilized in connection with the opposing shape memory tendons.
REFERENCES:
patent: 5114104 (1992-05-01), Cincotta et al.
patent: 5150864 (1992-09-01), Roglin et al.
patent: 5186420 (1993-02-01), Beauchamp et al.
patent: 5367970 (1994-11-01), Beauchamp et al.
patent: 5374011 (1994-12-01), Lazarus et al.
Carpenter Bernard F.
Maclean Brian J.
Misra Mohan S.
Chin, Esq. Gay
Hogan, Esq. Patrick
Kashnikow Andres
Lockheed Martin Corporation
Mojica Virna Lissi
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