Abstract: An actuator providing a large shear movement in a chosen direction. The angle of inclination of the fibers relative to the chosen direction is larger than 2° and smaller than 40°; the spaces between the piezoelectric fibers of the active layer are filled with an incompressible elastic material; the active layer comprises at least two dimensionally stable elongate elements parallel to the chosen direction; the ends of each fiber are adhesively bonded to said dimensionally stable elements using a rigid adhesive; and said dimensionally stable elements are adhesively bonded, by a rigid adhesive, to said electrode-bearing layers.

Abstract: An actuator providing a large shear movement in a chosen direction. The angle of inclination of the fibres relative to the chosen direction is larger than 2° and smaller than 40°; the spaces between the piezoelectric fibres of the active layer are filled with an incompressible elastic material; the active layer comprises at least two dimensionally stable elongate elements parallel to the chosen direction; the ends of each fibre are adhesively bonded to said dimensionally stable elements using a rigid adhesive; and said dimensionally stable elements are adhesively bonded, by a rigid adhesive, to said electrode-bearing layers.

Abstract: The present disclosure is directed to a rotary wing rotor comprising one or more blades. Each blade has a torsion frequency around its span being substantially equal to a rotation frequency (?) of the rotor; torsion means twist to the rotation frequency of the rotor, in synchronization with said rotation; and comprising a material configured to dampen the torsion resonance, so as to avoid the resonance divergence.

Abstract: The present disclosure is directed to a rotary wing rotor comprising one or more blades. Each blade has a torsion frequency around its span being substantially equal to a rotation frequency (?) of the rotor; torsion means twist to the rotation frequency of the rotor, in synchronization with said rotation; and comprising a material configured to dampen the torsion resonance, so as to avoid the resonance divergence.

Abstract: The invention relates to an elongated, torsion-deformable aerodynamic element, in which the upper surface (2) is continuous while the lower surface (3) comprises a longitudinal slot (6) in the direction of the span and in the vicinity of the leading edge (4). Furthermore, an actuator device (14) inside said aerodynamic element is capable of sliding the edges (6A and 6R) of the slot (6) relative to each other.

Abstract: The invention relates to an elongated, torsion-deformable aerodynamic element, in which the upper surface (2) is continuous while the lower surface (3) comprises a longitudinal slot (6) in the direction of the span and in the vicinity of the leading edge (4). Furthermore, an actuator device (14) inside said aerodynamic element is capable of sliding the edges (6A and 6R) of the slot (6) relative to each other.

Abstract: The present invention relates to a sandwich-structure flat active actuator that is symmetrical relative to the mid-plane comprising at least one piezoelectric flat layer having an active direction superpose and fixedly attached to at least one passive flat layer of fabric with rigid warp and weft oriented in two directions forming a mesh; the two directions of each layer of fabric are the same. The active direction of each piezoelectric layer is oriented along one and the same diagonal of the mesh of the layers of fabric. The invention is also aimed at a device consisting of two actuators mounted head-to-tail. The invention applies to the active torsion of structures such as, for example, a helicopter blade.

Abstract: The present invention relates to a sandwich-structure flat active actuator that is symmetrical relative to the mid-plane comprising at least one piezoelectric flat layer having an active direction superpose and fixedly attached to at least one passive flat layer of fabric with rigid warp and weft oriented in two directions forming a mesh; the two directions of each layer of fabric are the same. The active direction of each piezoelectric layer is oriented along one and the same diagonal of the mesh of the layers of fabric. The invention is also aimed at a device consisting of two actuators mounted head-to-tail. The invention applies to the active torsion of structures such as, for example, a helicopter blade.