Aeronautics and astronautics – Aircraft control
Patent
1994-07-06
1997-05-06
Barefoot, Galen L.
Aeronautics and astronautics
Aircraft control
244214, 244219, 244 1125, 60528, 310328, B64C 1324
Patent
active
056263120
ABSTRACT:
A piezoelectric actuator includes a plurality of linearly axially expandable hard piezoelectric rods located between two plates and are distributed about a central twistable core fastened between the plates, with the axis of the rod skew to the axis of the core, resembling a squirrel cage. The actuator produces a twisting movement between the plates, responsive to voltage induced expansion of those piezoelectric rods. Fly by Wire aircraft control is realized with the actuator in various systems providing all electric control of aerodynamic surfaces, including an electronic helicopter swashplate by which the effective pitch of the main rotor blade is controlled.
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Barefoot Galen L.
Goldman Ronald M.
McDonnell Douglas Corporation
Taylor Ronald L.
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