Aeronautics and astronautics – Aircraft control
Patent
1982-09-09
1985-03-05
Blix, Trygve M.
Aeronautics and astronautics
Aircraft control
244137R, 188380, 188267, B64D 100
Patent
active
045026521
ABSTRACT:
In a semi-active system for suppressing external load-carrying wing flutter in aircraft, the carrying wing (1) is provided with one or more external loads (2), and the suspension of the external load (2) on the carrying wing (1) about an axis is arranged at right angles to the plane of symmetry of the aircraft. The external load (2) is mounted to pivot about the axis (3). A spring is provided between the carrying wing (1) and the external load (2); however, it is constructed, to take up the stationary and quasi-stationary moments, as a linear spring (7) with relatively great stiffness and permitting only small spring excursions. A further spring (8) is arranged in parallel with spring (7) and is constructed to be nonlinear and also to have negative stiffness and passage through zero in the region of the negative stiffness. The springs (7 and 8) form a spring system of small stiffness in and about the operating point defined by the passage through zero of the nonlinear spring (8) and the stationary moments. The operating point of the nonlinear spring (8) is slaved in each equilibrium position between the carrying wing (1) and external load (2).
REFERENCES:
patent: 4314623 (1982-02-01), Kurokawa
patent: 4343447 (1982-08-01), Reed
patent: 4351515 (1982-09-01), Yoshida
Decoupler Pylon: A Simple, Effective Wing/Store Flutter Suppressor, Wilmer . Reed, III & Jerome T. Floughner, Jr.
Blix Trygve M.
Corl Rodney A.
Deutsche Forschungs- und Versuchsanstalt fur Luft-und Raumfahrt
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