Patent ID: 7175132

Claim:
Mechanism for eliminating limit cycle oscillations for servocontrolled aerodynamic control surfaces fixed to a structure, equipped with servoactuators and whose supports of the rotation axis or the hinged axis, determine free play due to the manufacturing tolerances and the wear of the bearings or joint elements, wherein said mechanism for eliminating limit cycle oscillations comprises an elastic element, spring or torsion bar, fixed to the structure wherein the control surface is jointed, an articulated rod rigidly connected to a free end of the elastic element, said articulated rod comprising a roller at a free end thereof a cam integral to the control surface, being the roller of the rod a following roller of the cam, in such a way that the following roller permanently contacts the cam, and deviations of the control surface together with the profile of the cam produce continuous nonlinear angular deformation of the elastic element, defining said angular deformation a force torque on the control surface, that reduces when the deviations of the control surface increase, being “0” for positive and negative deviations of the control surface that exceed a pre-established angular value.