Flexible self-erecting substructures for sensor networks

• US 8,201,773 B1
• Filed: 07/02/2008
• Issued: 06/19/2012
• Est. Priority Date: 07/02/2008
• Status: Expired due to Fees

• Current Assignee: the united states of america as represented by the secretary of the navy
• Original Assignee: The United States of America As Represented By The Secretary of Agriculture
• Inventors: Durham, Jayson T., Blanchi, Joshua
• Primary Examiner(s): Swiatek, Rob
• Assistant Examiner(s): Bonzell, Philip J
• Application Number:
  US12/167,075
• Time in Patent Office: 1,448 Days
• Field of Search: 244/218, 244/219, 244/99.8, 244/125.1, 244/130, 244/46, 244/49
• US Class Current: 244/49
• CPC Class Codes: B64C 39/028 Micro-sized aircraft
• CPC Class Codes: B64U 10/80 UAVs characterised by their small size, e.g. micro air vehicles [MAV]
• CPC Class Codes: B64U 30/12 Variable or detachable wings, e.g. wings with adjustable sweep
• CPC Class Codes: B64U 50/32 generated by fuel cells

Abstract

A composite flexible and aerodynamic load bearing wing structure suitable for compact unmanned vehicles, is described. Flexible printed circuitry and micro fuel cells can be incorporated as, or part of, the flexible aerodynamic structure. Accordingly, the overall system configuration can be optimized with respect to weight, space and size requirements. The flexible aerodynamic structure for the unmanned vehicle may be configured with a flexible dielectric substrate having an electrical contact on at least one surface of the substrate, and a flexible printed circuit disposed upon the substrate. The printed circuit can flex with the substrate and the substrate, with the printed circuit, to form a load lifting aerodynamic wing configuration when unfolded from a folded position.

Claims

1. An unmanned vehicle, comprising:

a flexible dielectric substrate having an electrical contact on at least one surface of the substrate;

a flexible printed circuit disposed upon the substrate, wherein the printed circuit flexes with the substrate;

a flexible fuel cell membrane electrode assembly built into the flexible dielectric substrate;

and wherein the substrate, with the printed circuit, form a load lifting, collapsible aerodynamic wing that is configured to self-erect from a folded position upon receiving thermal stimuli from the fuel cell; and

a propulsion system mounted to the substrate.

2. The unmanned vehicle according to claim 1, wherein the fuel cell is a low temperature fuel cell.

3. The unmanned vehicle according to claim 2, wherein the fuel cell is at least one of an Direct Methanol Fuel Cell, Proton Exchange Membrane Fuel Cell, Direct Borohydride Fuel Cell, and Solid Oxide Fuel Cell.

4. The unmanned vehicle according to claim 1, further comprising, a layer of shape memory polymer bonded to the substrate.

5. The unmanned vehicle according to claim 4, wherein the shape memory polymer self-erects due to the thermal stimuli from the fuel cell.

6. The unmanned vehicle according to claim 1, wherein the printed circuit is made of a material with structural memory such that the printed circuit contributes to the self-erecting capability of the wing.

7. The unmanned vehicle according to claim 6, wherein the printed circuit is made of a Nickel-Titanium shape memory alloy.

8. The unmanned vehicle according to claim 6, wherein the printed circuit is an antenna.

9. The unmanned vehicle according to claim 8, wherein the antenna is separated from the fuel cell membrane by the dielectric substrate and wherein the fuel cell comprises a free-breathing cathode layer and an opposing electrode layer separated from the cathode layer by a polymer electrolyte membrane, and wherein the cathode layer is disposed on an outer surface of the wing.

10. The unmanned vehicle according to claim 9, wherein the antenna is at least one of a printed antenna, microstrip antenna, patch antenna, and loop antenna.

11. The unmanned vehicle according to claim 9, wherein the flexible dielectric substrate is manufactured from polymer.

12. The unmanned vehicle according to claim 11, wherein the flexible dielectric substrate is made from polyimide.

13. The unmanned vehicle according to claim 10, wherein the flexible aerodynamic wing is non-inflatable.

14. An unmanned vehicle, comprising:

a flexible, foldable, self-erecting, non-inflatable, laminate, aerodynamic wing comprising a flexible fuel cell membrane electrode assembly layer and a flexible printed antenna layer separated from the fuel cell membrane electrode assembly layer by a flexible dielectric layer, and wherein the fuel cell membrane electrode assembly layer comprises a free-breathing cathode layer and an opposing electrode layer separated from the cathode layer by a polymer electrolyte membrane, and wherein the cathode layer is disposed on an outer surface of the wing, and wherein the wing is configured to self-erect upon receiving a thermal stimuli from the fuel cell; and

a propulsion system mounted to the wing.