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One aspect of the invention is a test assembly comprising a prime mover, an actuator assembly and a torque transfer coupling. The actuator assembly has an end configured to be attached to a shaft of a portion of a test specimen such as a wind turbine assembly. The actuator assembly has a shaft suppo

One aspect of the invention is a test assembly comprising a prime mover, an actuator assembly and a torque transfer coupling. The actuator assembly has an end configured to be attached to a shaft of a portion of a test specimen such as a wind turbine assembly. The actuator assembly has a shaft supported for rotation by hydraulic bearings. The torque transfer coupling connects the primer mover to the actuator assembly.

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1. A test assembly comprising: a prime mover;an actuator assembly having an end configured to be attached to a test specimen shaft of a test specimen, the actuator assembly having a support structure and a rotatable shaft;a first plurality of hydraulic bearings configured to support the shaft of the

1. A test assembly comprising: a prime mover;an actuator assembly having an end configured to be attached to a test specimen shaft of a test specimen, the actuator assembly having a support structure and a rotatable shaft;a first plurality of hydraulic bearings configured to support the shaft of the actuator assembly for rotation;a second plurality of hydraulic bearings supported by the support structure so as to apply an axial force to the shaft;a hydraulic power source operably coupled to each of the hydraulic bearings to apply pressurized fluid; anda controller configured to provide control signals to selectively pressurize the second plurality of hydraulic bearings so as to apply at least an axial force to the shaft in a first axial direction. 2. The test assembly of claim 1 wherein the support structure supports each of the hydraulic bearings, the test assembly further comprising actuators connected to the support structure and arranged to apply forces and moments to the input shaft. 3. The test assembly of claim 1 wherein the first plurality of hydraulic bearings comprise a plurality of bearing element assemblies disposed at spaced apart positions circumferentially about the shaft. 4. A test assembly comprising: a prime mover,an actuator assembly having an end configured to be attached to a test specimen shaft of a test specimen, the actuator assembly having a support structure and a rotatable shaft;a first plurality of hydraulic bearings mounted to the support structure and configured to support the shaft of the actuator assembly for rotation, the hydraulic bearings comprising a plurality of bearing element assemblies disposed circumferentially about the shaft, wherein each bearing element assembly comprises a piston and cylinder assembly; anda plurality of sensors configured to measure fluid pressure in at least some of the bearing element assemblies. 5. The test assembly of claim 4 and further comprising a hydraulic power source operably coupled to each of the piston and cylinder assemblies to apply pressurized fluid and a controller configured to provide control signals to selectively pressurize the piston and cylinder assemblies. 6. The test assembly of claim 5 wherein the pressure sensors are configured to provide input signals to the controller and the controller is configured to ascertain at least one of a force or a moment applied to the shaft. 7. The test assembly of claim 6 wherein the controller is configured to ascertain forces along a rotational axis of the shaft and forces along two axes mutually orthogonal to each other and to the rotational axis, and moments about the two axes. 8. The test assembly of claim 1 and further comprising a hydraulic power source operably coupled to each of the hydraulic bearings to apply pressurized fluid and a controller configured to provide control signals to selectively pressurize the first plurality of hydraulic bearings so as to apply a first lateral force in a first lateral direction orthogonal to an axis of rotation of the shaft. 9. The test assembly of claim 8 wherein the first plurality of hydraulic bearings are configured to apply a second lateral force in a direction orthogonal to both the first lateral direction and the axis of rotation of the shaft, and wherein the controller is configured to provide control signals to selectively pressurize the hydraulic bearings so as to apply the first lateral force and the second lateral force. 10. The test assembly of claim 1 wherein the first plurality of hydraulic bearings comprise a first set of hydraulic bearings circumferentially spaced about the shaft and a third set of hydraulic bearings circumferentially spaced about the shaft, the third set of hydraulic bearings being axially spaced apart from the first set of hydraulic bearings on the shaft, wherein each of the sets of hydraulic bearings are configured to apply a first lateral force orthogonal to the axis of rotation and a second lateral force orthogonal to the axis of rotation, and wherein the controller is configured to provide control signals to selectively pressurize the first and second sets of hydraulic bearings so as to apply a first moment to the shaft about a first axis orthogonal to the axis of rotation of the shaft. 11. The test assembly of claim 10 wherein the controller is configured to provide control signals to selectively pressurize the first plurality of hydraulic bearings so as to apply a second moment to the shaft about a second axis orthogonal to the axis of rotation of the shaft and orthogonal to the first axis. 12. The test assembly of claim 1 wherein the shaft includes a first annular surface about the axis of rotation of the shaft, and wherein the first plurality of hydraulic bearings are configured to engage a portion of the first annular surface that is orthogonal or oblique to the rotational axis of the shaft. 13. The test assembly of claim 12 wherein the shaft includes a second annular surface about the axis of rotation of the shaft, wherein the support structure is configured for supporting a second plurality of hydraulic bearings to engage a portion of the second annular surface that is orthogonal or oblique to the rotational axis of the shaft, and wherein the controller is configured to provide control signals to selectively pressurize the second plurality of hydraulic bearings so as to apply at least a second axial force to the shaft in a second axial direction opposite the first axial direction. 14. The test assembly of claim 13 wherein the first annular surface faces the second annular surface. 15. The test assembly of claim 14 wherein the first annular surface and the second annular surface face in opposite directions. 16. The test assembly of claim 15 wherein the first annular surface and the second annular surface extend radially beyond an outer cylindrical surface of the shaft used to support the shaft for rotation. 17. A test assembly comprising: a prime mover having a primer mover shaft;an actuator assembly having an end configured to be attached to a test specimen shaft of a test specimen, the actuator assembly having a support structure and a rotatable shaft;a first plurality of hydraulic bearings configured to support the shaft of the actuator assembly for rotation; anda torque transfer coupling connecting one the shaft of the actuator assembly to one of the prime mover shaft or a shaft of the test specimen, the torque transfer coupling comprising: a set of hydraulic devices, each hydraulic device of the set of hydraulic devices having a first end connected to the shaft and a second end connected to one of the prime mover shaft or the shaft of the test specimen. 18. The test assembly of claim 17 wherein each hydraulic device comprises a piston, and wherein the hydraulic devices of the set of hydraulic devices are circumferentially disposed about an axis of the shaft wherein extension and retraction of a piston of each hydraulic devices is generally tangential to a portion of a circle encircling the shaft. 19. A test assembly comprising: a prime mover;an actuator assembly having an end configured to be attached to a test specimen shaft of a test specimen, the actuator assembly having a shaft, the shaft having a circumferential surface and first and second annular surfaces that are disposed in planes arranged to intersect with a rotational axis of the shaft;a first plurality of hydraulic bearings configured to support the shaft of the actuator assembly for rotation about the rotational axis;a second plurality of hydraulic bearings configured to engage the first annular surface; anda third plurality of hydraulic bearings configured to engage the second annular surface. 20. The test assembly of claim 19 wherein the first plurality of hydraulic bearings comprise a first set of hydraulic bearings circumferentially spaced about the shaft and a second set of hydraulic bearings circumferentially spaced about the shaft, the second set of hydraulic bearings being axially spaced apart from the first set of hydraulic bearings on the shaft, wherein each of the sets of hydraulic bearings are configured to apply a first lateral force orthogonal to the axis of rotation and a second lateral force orthogonal to the axis of rotation, and wherein the test assembly further comprises a controller configured to provide control signals to selectively pressurize the first and second sets of hydraulic bearings so as to apply a first moment to the shaft about a first axis orthogonal to the axis of rotation of the shaft. 21. The test assembly of claim 20 wherein the controller is configured to provide control signals to selectively pressurize the first plurality of hydraulic bearings so as to apply a second moment to the shaft about a second axis orthogonal to the axis of rotation of the shaft and orthogonal to the first axis. 22. A method for applying force and moment loads to a wind turbine assembly, comprising: operating an actuator assembly to apply at least one of a force or a moment loads to an end of a shaft of the wind turbine assembly while the shaft of the wind turbine assembly is rotating, the actuator assembly having a shaft supported for rotation by hydraulic bearings;operating the hydraulic bearings to allow rotation of the shaft of the actuator assembly; andapplying torque to a torque transfer coupling that is connected to the shaft of the actuator assembly. 23. The method of claim 22 wherein the torque transfer coupling comprises a plurality of hydraulic devices, the method further comprising operating the hydraulic devices to transfer torque to the shaft of the actuator assembly while an axis of the shaft of the actuator assembly moves in five degrees of freedom relative to an axis of rotation of the torque transfer coupling.