Aeronautics and astronautics – Aircraft control – Flutter control
Reexamination Certificate
2007-02-13
2007-02-13
Luu, Teri Pham (Department: 3644)
Aeronautics and astronautics
Aircraft control
Flutter control
Reexamination Certificate
active
11027834
ABSTRACT:
Servocontrolled aerodynamic control surfaces, such as the direction rudder (1) of an airplane, are equipped with servoactuators (5). The bearing supports (3) of the rotation axis (2) or hinged axis give rise to the formation of free play for the manufacturing tolerances, that will be more pronounced with the wear of the bearings or joint elements.The mechanism (8) in question includes an elastic element (10) fixed to the structure (4) wherein the control surface (1) is jointed, connected rigidly to an articulated connecting rod (12) having a following roller (13) of a cam (9) integral to the control surface (1). The cam (9) profile produces a continuous nonlinear, angular deformation, of the elastic element in order to determine a force torque on the control surface (1) that is maximum in the neutral position of the control surface and manages to be eliminated in the extreme side deviations.
REFERENCES:
patent: 2254473 (1941-09-01), De Bell
patent: 2471857 (1949-05-01), Bleakney et al.
Design of Machinery, 2nd ed, new media version, by R. Norton, McGraw-Hill, 1999. Fig. 8-39.
http://web.archive.org/web/20031226144555/www.engr.colostate.edu/˜dga/me324/index.html (useful figures from the book link).
Airbus Espana S.L.
Klauber & Jackson
Luu Teri Pham
Mayle Edward J.
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