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A fluid energy transfer device, including a chamber for receiving a fluid, at least a portion of the chamber comprising a movable portion relative to another portion of the chamber, the movable portion being adapted to change the volume of the chamber from a first volume to a second volume by moveme

A fluid energy transfer device, including a chamber for receiving a fluid, at least a portion of the chamber comprising a movable portion relative to another portion of the chamber, the movable portion being adapted to change the volume of the chamber from a first volume to a second volume by movement of the movable portion. The device further includes an actuator attached to the movable portion, wherein the displacements of the movable portion can be larger than the displacement of the actuator.

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1. A fluid energy transfer device, comprising: a chamber for receiving a fluid, at least a portion of the chamber comprising a first flexible portion being movable relative to a second portion of the chamber, the first flexible portion being adapted to change the volume of the chamber from a first v

1. A fluid energy transfer device, comprising: a chamber for receiving a fluid, at least a portion of the chamber comprising a first flexible portion being movable relative to a second portion of the chamber, the first flexible portion being adapted to change the volume of the chamber from a first volume to a second volume by bending of the first flexible portion; andat least a single force-generating actuator having an attachment point to the first flexible portion at a point of zero flexing displacement and an attachment point to the second portion of the chamber and generating forces in the direction of the first flexible portion's flexing displacement;wherein the force-generating actuator exerts alternating forces between the flexible portion of the chamber and the second portion of the chamber with changes in the chamber volume resulting from the instantaneous sum of the actuator displacement and the flexing displacement of the first flexible portion. 2. The device of claim 1, wherein the actuator is driven at a frequency so as to store energy in the system resonance such that the displacements of the first flexible portion increase proportionately with the stored energy. 3. The fluid energy transfer device of claim 1, wherein the force-generating actuator comprises a variable reluctance actuator. 4. The fluid energy transfer device of claim 1, wherein the force-generating actuator comprises a solid electro-active actuator. 5. A pump, comprising: the device of claim 1;a fluid inlet port in fluid communication with the chamber; anda fluid outlet port in fluid communication with the chamber;wherein the device is adapted to draw fluid into the chamber through the inlet port during movement of the flexible portion in a manner that increases the volume of the chamber, andwherein the device is adapted to expel fluid out of the chamber through the outlet port during movement of the flexible portion in a manner that decreases the volume of the chamber. 6. The fluid energy transfer device of claim 1, wherein: the second portion of the chamber comprises a second flexible portion of the chamber movable relative to the first flexible portion of the chamber, andthe force-generating actuator also having an attachment point to the second flexible portion at a point of zero flexing displacement of the second flexible portion,wherein the force-generating actuator exerts alternating forces between the first and second flexible portions of the chamber thereby resulting in peak displacements, between the maximum deflection points of the first and second flexible chamber portions, that are greater than the axial displacements of the force generating actuator. 7. An acoustic energy transfer device comprising: an acoustic resonator for supporting resonant acoustic modes, and the fluid energy transfer device of claim 1. 8. The acoustic energy transfer device of claim 7, wherein the acoustic modes are longitudinal modes. 9. The acoustic energy transfer device of claim 7, wherein the acoustic modes are radial modes. 10. The acoustic energy transfer device of claim 7, wherein the acoustic resonator comprises a resonant synthetic jet. 11. The acoustic energy transfer device of claim 7, wherein the acoustic resonator comprises the resonator of an acoustic compressor. 12. A synthetic jet device comprising: a synthetic jet, wherein the synthetic jet is driven by the fluid energy transfer device of claim 1.