Volume-conversion techniques for active-materials-based morphing structures

• US 7,444,813 B1
• Filed: 08/19/2005
• Issued: 11/04/2008
• Est. Priority Date: 08/19/2005
• Status: Expired due to Fees

• Current Assignee: HRL Laboratories LLC (The Boeing Co.)
• Original Assignee: HRL Laboratories LLC (The Boeing Co.)
• Inventors: Barvosa-Carter, William Bernard
• Primary Examiner(s): LESLIE, MICHAEL S
• Application Number:
  US11/207,484
• Time in Patent Office: 1,173 Days
• Field of Search: 605/33, 605/37, 605/45, 605/71, 91/5
• US Class Current: 60/533
• CPC Class Codes: F15B 1/106 characterised by the way housing components are assembled
• CPC Class Codes: F15B 21/00 Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass

Abstract

Described is a volume-conversion structure for causing a volume transfer. The volume-conversion structure includes a first reservoir and a second reservoir. The first reservoir includes a first volume for holding a fluid therein. An actively deformable material structure (ADMS) is disposed around the first reservoir, with the ADMS being responsive to a deformation activation element to change the ADMS'"'"' shape to cause compression of the first reservoir. The second reservoir is in fluid communication with the first reservoir. The second reservoir has a first-second reservoir configuration and a second-second reservoir configuration. Actuation of the deformation activation element causes compression of the ADMS, thereby compressing the first reservoir to have a smaller second volume and displace the fluid from the first reservoir to the second reservoir to change the second reservoir'"'"'s configuration from the first-second reservoir configuration to the second-second reservoir configuration.

Claims

1. A volume-conversion structure for causing a volume transfer, comprising:

a first reservoir having a first volume for holding a fluid therein, and having a compressible surface area, including an actively deformable material structure disposed around the first reservoir, where the actively deformable material structure is responsive to a deformation activation element to change the actively deformable material structure'"'"'s shape to cause compression of the first reservoir; and

a second reservoir in fluid communication with the first reservoir, the second reservoir having a first-second reservoir configuration and a second-second reservoir configuration, whereby actuation of the deformation activation element causes compression of the actively deformable material structure, thereby compressing the first reservoir to have a smaller second volume and displace the fluid from the first reservoir to the second reservoir to change the second reservoir'"'"'s configuration from the first-second reservoir configuration to the second-second reservoir configuration.

2. A volume-conversion structure for causing a volume transfer as set forth in claim 1, wherein the actively deformable material structure is disposed around the first reservoir in a form selected from a group consisting of being a material forming the compressible surface area and being separately formed and circumferentially attached with the compressible surface area.

3. A volume-conversion structure for causing a volume transfer as set forth in claim 1, wherein the change from the first-second reservoir configuration to the second-second reservoir configuration is in a form selected from a group consisting of a change in length of the second reservoir, a change in volume of the second reservoir, and a change in geometry of the second reservoir.

4. A volume-conversion structure for causing a volume transfer as set forth in claim 1, further comprising a piston operably connected with the second reservoir, such that a change in the second reservoir'"'"'s configuration from the first-second reservoir configuration to the second-second reservoir configuration causes the piston to move from a first position to a second position.

5. A volume-conversion structure for causing a volume transfer as set forth in claim 1, wherein the first-second reservoir configuration includes a length with the length rolled onto itself, thereby forming a rolled structure, such that when changed to the second-second reservoir configuration, the rolled structure unrolls and extends out.

6. A volume-conversion structure for causing a volume transfer as set forth in claim 1, where the second reservoir includes a plurality of branches, such that first-second reservoir configuration is a deflated branched structure, and when the fluid is displaced from the first reservoir into the second reservoir, the second-second reservoir configuration is an expanded branched structure.

7. A volume-conversion structure for causing a volume transfer as set forth in claim 1, further comprising an actively controllable valve positioned between the first reservoir and the second reservoir, the valve being positioned such that it controls the fluid connection between the two reservoirs such that once the fluid is displaced from the first reservoir to the second reservoir, the valve prevents the fluid from returning to the first reservoir, thereby holding the second reservoir in the second-second reservoir configuration.

8. A volume-conversion structure for causing a volume transfer as set forth in claim 1, further comprising a freezable fluid disposed within the first reservoir, the freezable fluid having a liquid and solid form, such that when in the liquid form, the freezable fluid may be displaced from the first reservoir to the second reservoir, and once in the second reservoir, when conditions allow, the freezable fluid solidifies to take a solid form, thereby maintaining the second reservoir in the second-second reservoir configuration.

9. A volume-conversion structure for causing a volume transfer as set forth in claim 8, wherein the freezable fluid is a selectively deformable material structure.

10. A volume-conversion structure for causing a volume transfer as set forth in claim 8, further comprising at least two rigid plates connected with the second reservoir such that the second reservoir is sandwiched between the two rigid plates, thereby forming a variable-stiffness beam, whereby as an increasing amount of the freezable fluid is disposed within the second reservoir, a width of the second reservoir increases and thereby forces the two rigid plates further apart, such that when the freezable fluid is within the second reservoir it may be frozen to form a stiff beam, and as the width of the reservoir increases, the stiffness of the second reservoir increases.

11. A volume-conversion structure for causing a volume transfer as set forth in claim 1, further comprising a skin element disposed around the second reservoir, the skin element having a variable stiffness and being responsive to a second deformation activation element, such that the flexibility of the skin element can be altered upon actuation of the second deformation activation element, allowing a user to hold the second reservoir in the second-second reservoir configuration after the fluid has been allowed to leave the second reservoir.

12. A volume-conversion structure for causing a volume transfer as set forth in claim 11, wherein the skin element is formed of a shape memory polymer.

13. A method for forming a volume-conversion structure, the method comprising acts of:

forming a first reservoir having a first volume for holding a fluid therein, and having a compressible surface area, including an actively deformable material structure disposed around the first reservoir, where the actively deformable material structure is responsive to a deformation activation element to change the actively deformable material structure'"'"'s shape to cause compression of the first reservoir; and

forming a second reservoir in fluid communication with the first reservoir, the second reservoir having a first-second reservoir configuration and a second-second reservoir configuration, whereby actuation of the deformation activation element causes compression of the actively deformable material structure, thereby compressing the first reservoir to have a smaller second volume and displace the fluid from the first reservoir to the second reservoir to change the second reservoir'"'"'s configuration from the first-second reservoir configuration to the second-second reservoir configuration.

14. A method for forming a volume-conversion structure as set forth in claim 13, wherein in the act of forming the first reservoir, the actively deformable material structure is disposed around the first reservoir in a form selected from a group consisting of being a material forming the compressible surface area and being separately formed and circumferentially attached with the compressible surface area.

15. A method for forming a volume-conversion structure as set forth in claim 13, wherein in the act of forming the second reservoir, the second reservoir is formed such that the change from the first-second reservoir configuration to the second-second reservoir configuration is in a form selected from a group consisting of a change in length of the second reservoir, a change in volume of the second reservoir, and a change in geometry of the second reservoir.

16. A method for forming a volume-conversion structure as set forth in claim 13, further comprising an act of operably connecting a piston with the second reservoir, such that a change in the second reservoir'"'"'s configuration from the first-second reservoir configuration to the second-second reservoir configuration causes the piston to move from a first position to a second position.

17. A method for forming a volume-conversion structure as set forth in claim 13, wherein in the act of forming the second reservoir, the second reservoir is formed such that the first-second reservoir configuration includes a length with the length rolled onto itself, thereby forming a rolled structure, such that when changed to the second-second reservoir configuration, the rolled structure unrolls and extends out.

18. A method for forming a volume-conversion structure as set forth in claim 13, wherein in the act of forming the second reservoir, the second reservoir is formed such that the second reservoir includes a plurality of branches, such that first-second reservoir configuration is a deflated branched structure, and when the fluid is displaced from the first reservoir into the second reservoir, the second-second reservoir configuration is an expanded branched structure.

19. A method for forming a volume-conversion structure as set forth in claim 13, further comprising an act of positioning an actively controllable valve between the first reservoir and the second reservoir, the valve being positioned such that it controls the fluid connection between the two reservoirs such that once the fluid is displaced from the first reservoir to the second reservoir, the valve prevents the fluid from returning to the first reservoir, thereby holding the second reservoir in the second-second reservoir configuration.

20. A method for forming a volume-conversion structure as set forth in claim 13, further comprising an act of disposing a freezable fluid within the first reservoir, the freezable fluid having a liquid and solid form, such that when in the liquid form, the freezable fluid may be displaced from the first reservoir to the second reservoir, and once in the second reservoir, when conditions allow, the freezable fluid solidifies to take a solid form, thereby maintaining the second reservoir in the second-second reservoir configuration.

21. A method for forming a volume-conversion structure as set forth in claim 20, wherein in the act of disposing a freezable fluid within the first reservoir, the freezable fluid is a selectively deformable material structure.

22. A method for forming a volume-conversion structure as set forth in claim 20, further comprising an act of connecting at least two rigid plates with the second reservoir such that the second reservoir is sandwiched between the two rigid plates, thereby forming a variable-stiffness beam, whereby as an increasing amount of the freezable fluid is disposed within the second reservoir, a width of the second reservoir increases and thereby forces the two rigid plates further apart, such that when the freezable fluid is within the second reservoir it may be frozen to form a stiff beam, and as the width of the reservoir increases, the stiffness of the second reservoir increases.

23. A method for forming a volume-conversion structure as set forth in claim 13, further comprising an act of disposing a skin element around the second reservoir, the skin element having a variable stiffness and being responsive to a second deformation activation element, such that the flexibility of the skin element can be altered upon actuation of the second deformation activation element, allowing a user to hold the second reservoir in the second-second reservoir configuration after the fluid has been allowed to leave the second reservoir.

24. A method for forming a volume-conversion structure as set forth in claim 23, wherein in the act of disposing the skin element around the second reservoir, the skin element is formed of a shape memory polymer.

25. A method for volume-conversion, the method comprising acts of:

selecting a volume-conversion structure having both a first reservoir and a second reservoir, where the first reservoir includes a first volume for holding a fluid therein, and having a compressible surface area, including an actively deformable material structure disposed around the first reservoir, where the actively deformable material structure is responsive to a deformation activation element to change the actively deformable material structure'"'"'s shape to cause compression of the first reservoir; and

where the second reservoir is in fluid communication with the first reservoir, the second reservoir having a first-second reservoir configuration and a second-second reservoir configuration; and

actuating the deformation activation element to cause compression of the actively deformable material structure, whereby actuation of the deformation activation element causes compression of the actively deformable material structure, thereby compressing the first reservoir to have a smaller second volume and displace the fluid from the first reservoir to the second reservoir to change the second reservoir'"'"'s configuration from the first-second reservoir configuration to the second-second reservoir configuration.

26. A method for volume-conversion as set forth in claim 25, further comprising an act of selecting a volume-conversion structure such that the actively deformable material structure is disposed around the first reservoir in a form selected from a group consisting of being a material forming the compressible surface area and being separately formed and circumferentially attached with the compressible surface area.

27. A method for volume-conversion as set forth in claim 25, further comprising an act of selecting a volume-conversion structure such that the change from the first-second reservoir configuration to the second-second reservoir configuration is in a form selected from a group consisting of a change in length of the second reservoir, a change in volume of the second reservoir, and a change in geometry of the second reservoir.

28. A method for volume-conversion as set forth in claim 25, further comprising an act of selecting a volume-conversion structure such that the volume-conversion structure includes a piston operably connected with the second reservoir, such that a change in the second reservoir'"'"'s configuration from the first-second reservoir configuration to the second-second reservoir configuration causes the piston to move from a first position to a second position.

29. A method for volume-conversion as set forth in claim 25, further comprising an act of selecting a volume-conversion structure such that the first-second reservoir configuration includes a length with the length rolled onto itself, thereby forming a rolled structure, such that when changed to the second-second reservoir configuration, the rolled structure unrolls and extends out.

30. A method for volume-conversion as set forth in claim 25, further comprising an act of selecting a volume-conversion structure such that the second reservoir includes a plurality of branches, such that first-second reservoir configuration is a deflated branched structure, and when the fluid is displaced from the first reservoir into the second reservoir, the second-second reservoir configuration is an expanded branched structure.

31. A method for volume-conversion as set forth in claim 25, further comprising an act of selecting a volume-conversion structure such that the volume-conversion structure includes an actively controllable valve positioned between the first reservoir and the second reservoir, the valve being positioned such that it controls the fluid connection between the two reservoirs such that once the fluid is displaced from the first reservoir to the second reservoir, the valve prevents the fluid from returning to the first reservoir, thereby holding the second reservoir in the second-second reservoir configuration.

32. A method for volume-conversion as set forth in claim 25, further comprising an act of selecting a volume-conversion structure such that the volume-conversion structure includes a freezable fluid disposed within the first reservoir, the freezable fluid having a liquid and solid form, such that when in the liquid form, the freezable fluid may be displaced from the first reservoir to the second reservoir, and once in the second reservoir, when conditions allow, the freezable fluid solidifies to take a solid form, thereby maintaining the second reservoir in the second-second reservoir configuration.

33. A method for volume-conversion as set forth in claim 32, wherein the freezable fluid is a selectively deformable material structure.

34. A method for volume-conversion as set forth in claim 32, further comprising an act of selecting a volume-conversion structure such that the volume-conversion structure includes at least two rigid plates connected with the second reservoir such that the second reservoir is sandwiched between the two rigid plates, thereby forming a variable-stiffness beam, whereby as an increasing amount of the freezable fluid is disposed within the second reservoir, a width of the second reservoir increases and thereby forces the two rigid plates further apart, such that when the freezable fluid is within the second reservoir it may be frozen to form a stiff beam, and as the width of the reservoir increases, the stiffness of the second reservoir increases.

35. A method for volume-conversion as set forth in claim 25, further comprising an act of selecting a volume-conversion structure such that the volume-conversion structure includes a skin element disposed around the second reservoir, the skin element having a variable stiffness and being responsive to a second deformation activation element, such that the flexibility of the skin element can be altered upon actuation of the second deformation activation element, allowing a user to hold the second reservoir in the second-second reservoir configuration after the fluid has been allowed to leave the second reservoir.

36. A method for volume-conversion as set forth in claim 35, wherein the skin element is formed of a shape memory polymer.