A system, in certain embodiments, includes an accumulator. The accumulator includes a first cylinder configured to receive a fluid within an internal volume of the first cylinder. The accumulator also includes a piston configured to move axially within the first cylinder. Axial movement of the pisto
A system, in certain embodiments, includes an accumulator. The accumulator includes a first cylinder configured to receive a fluid within an internal volume of the first cylinder. The accumulator also includes a piston configured to move axially within the first cylinder. Axial movement of the piston within the first cylinder adjusts the internal volume of the first cylinder. The accumulator further includes a plurality of shape memory alloy wires configured to cause the axial movement of the piston within the first cylinder.
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1. A system, comprising: an accumulator configured to store hydraulic fluid to operate subsea equipment, wherein the accumulator comprises: a first cylinder configured to receive a fluid within an internal volume of the first cylinder;a piston configured to move axially within the first cylinder, wh
1. A system, comprising: an accumulator configured to store hydraulic fluid to operate subsea equipment, wherein the accumulator comprises: a first cylinder configured to receive a fluid within an internal volume of the first cylinder;a piston configured to move axially within the first cylinder, wherein axial movement of the piston within the first cylinder adjusts the internal volume of the first cylinder;a rod extending axially from the piston;a first end cap disposed at a first axial end of the accumulator, wherein the first end cap is connected to the rod;a second end cap disposed at a second axial end of the accumulator, wherein the second end cap is connected to the first cylinder;a plurality of shape memory alloy wires extending from the first end cap to the second end cap, wherein the plurality of shape memory alloy wires are configured to cause the axial movement of the piston within the first cylinder; anda controller configured to adjust an amount of electrical current through the plurality of shape memory alloy wires based at least in part on a measurement sensed by a sensor. 2. The system of claim 1, wherein the second end cap comprises an opening through which the fluid enters and exits the internal volume of the first cylinder. 3. The system of claim 1, comprising a power supply configured to supply an electrical current through the plurality of shape memory alloy wires. 4. The system of claim 1, wherein the accumulator comprises a second cylinder which radially surrounds the first cylinder. 5. The system of claim 1, comprising a blowout preventer stack assembly having the accumulator. 6. The system of claim 1, wherein the plurality of shape memory alloy wires are made of a material comprising Nitinol or other types of shape memory alloys. 7. The system of claim 1, wherein the plurality of shape memory alloy wires are disposed external to the first cylinder. 8. The system of claim 1, wherein the accumulator comprises a frame between the first cylinder and the first end cap. 9. A system, comprising: an accumulator configured to store hydraulic fluid to operate subsea equipment, wherein the accumulator comprises a piston disposed within a cylinder, a frame coupled to the cylinder, a rod extending from the piston and completely through the frame, a first end cap connected to the rod and disposed at a first axial end of the accumulator, and a second end cap connected to the cylinder and disposed at a second axial end of the accumulator; wherein the piston is configured to be axially moved within the cylinder by a shape memory alloy extending from the first end cap to the second end cap. 10. The system of claim 9, wherein the shape memory alloy comprises a plurality of shape memory alloy wires configured to cause axial movement of the piston within the cylinder. 11. The system of claim 9, wherein the shape memory alloy comprises a film of shape memory alloy configured to cause axial movement of the piston within the cylinder. 12. The system of claim 9, comprising a power supply configured to supply an electrical current through the shape memory alloy. 13. The system of claim 12, comprising a controller configured to adjust the supply of electrical current through the shape memory alloy. 14. The system of claim 9, wherein the shape memory alloy is made of a material comprising Nitinol or other types of shape memory alloys. 15. The system of claim 9, wherein the shape memory alloy is disposed external to the cylinder. 16. The system of claim 12, comprising a sensor coupled to a controller, wherein the controller is configured to use a measurement from the sensor to adjust the supply of electrical current through the shape memory alloy. 17. The system of claim 9, wherein the frame comprises at least one linear bearing. 18. The system of claim 9, wherein the cylinder couples to an end of the frame. 19. A method for actuating an accumulator configured to store hydraulic fluid to operate subsea equipment, comprising: supplying an electrical current through a plurality of shape memory alloy wires extending from a first end cap disposed at a first axial end of the accumulator to a second end cap disposed at a second axial end of the accumulator to cause axial movement of an accumulator piston within an accumulator cylinder; andadjusting an amount of the electrical current with a controller based at least in part on a measurement sensed by a sensor. 20. The method of claim 19, wherein supplying the electrical current through the plurality of shape memory alloy wires comprises increasing the temperature of the plurality of shape memory alloy wires above a transition temperature of the plurality of shape memory alloy wires, wherein the transition temperature of the plurality of shape memory alloy wires is the temperature at which the plurality of shape memory alloy wires transit from a Martensite phase to an Austenite phase. 21. The method of claim 19, wherein the plurality of shape memory alloy wires are disposed external to the accumulator cylinder. 22. The system of claim 19, wherein the sensor comprises a pressure sensor, a temperature sensor, a flow rate sensor, or a displacement sensor.
Whitehead Charles A. (3508 S. Woodridge Rd. Birmingham AL 36330) Groom Kenneth M. (119 Hillcrest Loop Enterprise AL 36330), Hydraulic shape memory alloy actuator.
Whitehead Charles A. (3508 S. Woodridge Rd. Birmingham AL 35223) Groom Kenneth N. (119 Hillcrest Loop Enterprise AL 36330), Hydraulic shape memory material stress to hydraulic pressure transducer.
Abdelmalek Fawzy T. (12807 Willowyck Dr. St. Louis MO 63146), Shock absorber and a hermetically sealed scroll gas expander for a vehicular gas compression and expansion power system.
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