Active twisting of an aircraft lifting surface via modulated clamping of substructure

1. An aircraft wing having a controllable structural stiffness for adjusting its shape, the wing comprising:

an upper wing surface;

at least one upper spar coupled to said upper wing surface;

a lower wing surface;

at least one lower spar coupled to said lower wing surface;

a plurality of fasteners for connecting said one upper spar and said one lower spar;

at least one of said fasteners comprising an adjustable clamp movable between a clamped position wherein said one upper spar and said one lower spar are secured at said clamp for fixing the shape of said wing and an unclamped position wherein said one upper spar and said one lower spar are relatively movable at said clamp for adjusting the shape of said wing.

2. An aircraft wing in accordance with claim 1 , wherein: said adjustable clamp comprises a bolt of adjustable grip.

3. An aircraft wing in accordance with claim 2 , wherein:

said one upper spar and said one lower spar each comprise aligned longitudinal slots receiving said bolt.

4. An aircraft wing in accordance with claim 2 , wherein:

said bolt is a piezo-electric bolt.

5. An aircraft wing in accordance with claim 1 , wherein:

each of said plurality of fasteners comprises a corresponding adjustable clamp selectively movable between a clamped position wherein said one upper spar and said one lower spar are secured together at said clamp for fixing the shape of said wing and an unclamped position wherein said one upper spar and said one lower spar are relatively movable at said clamp for adjusting the shape of said wing, each said adjustable clamp being spaced along said one upper spar and said one lower spar.

6. An aircraft wing in accordance with claim 5 , comprising:

a second upper spar associated with said upper wing surface;

a second lower spar associated with said lower wing surface;

a plurality of second fasteners for connecting said second upper spar and said second lower spar;

at least one of said second fasteners comprising an adjustable second clamp movable between a clamped position wherein said second upper spar and said second lower spar are secured at said clamp for fixing the shape of said wing and an unclamped position wherein said second upper spar and said second lower spar are relatively movable at said second clamp for adjusting the shape of said wing.

7. An aircraft wing in accordance with claim 6 , wherein:

a bending axis of said wing is defined by selectively controlling said first fasteners and selectively controlling said second fasteners.

8. An aircraft wing in accordance with claim 7 , wherein:

aerodynamic forces bend said wing about said bending axis and produce a predetermined twist in said wing.

9. An aircraft wing in accordance with claim 6 , wherein:

a first bending axis of said wing is defined by selectively controlling a first plurality of said first fasteners along and selectively controlling a first plurality of said second fasteners.

10. An aircraft wing in accordance with claim 9 , wherein:

a second bending axis of said wing is defined by selectively controlling a second plurality of said first fasteners along and selectively controlling a second plurality of said second fasteners.

11. An aircraft wing in accordance with claim 10 , wherein:

when said wing is subjected to aerodynamic forces, said first bending axis produces a twist in said wing in a first direction and said second bending axis produces a twist in said wing in a second direction.

12. An aircraft wing comprising:

an upper wing surface;

a first substructure extending from said upper wing surface;

a lower wing surface;

a second substructure extending from said lower wing surface;

a plurality of selectively operable clamping assemblies coupling said first and said second substructures and operable to selectively control the structural stiffness of said wing.

13. An aircraft wing in accordance with claim 12 , wherein:

said plurality of selectively operable clamping assemblies are selectively operable to provide a controllable bending axis for said wing.

14. An aircraft wing in accordance with claim 13 , wherein:

the clamping force of each of said plurality of selectively operable clamping assemblies is modulated to control twist of said aircraft wing in the presence of aerodynamic forces.

15. An aircraft wing in accordance with claim 12 , wherein:

the clamping force of each of said plurality of selectively operable clamping assemblies is modulated to modulate the bending axis of said wing.

16. A method for controlling a wing comprising an upper wing surface and a lower wing surface, said method comprising:

providing a first substructure coupled to said upper wing surface;

providing a second substructure coupled to said lower wing surface;

providing a plurality of selectively operable clamping assemblies coupling said first and said second substructures; and

selectively adjusting said clamping assemblies to selectively control the structural stiffness of said wing.

17. A method in accordance with claim 16 , comprising:

controlling the bending axis of said wing with said clamping assemblies.

18. A method in accordance with claim 17 , comprising:

controlling the twist of said aircraft wing in the presence of aerodynamic forces by modulating the clamping force of each of said plurality of selectively operable clamping assemblies.

19. A method in accordance with claim 17 , comprising:

modulating the bending axis of said by selectively modulating the clamping force of each of said plurality of selectively operable clamping assemblies.

20. A method in accordance with claim 16 , comprising:

controlling the twist of said aircraft wing in the presence of aerodynamic forces by selectively adjusting the structural stiffness of said wing.