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An example arrangement for driving a turbomachine includes an input shaft that is configured to rotate a rotor of the turbomachine through a hydraulic log and gear differential rotatable coupled to the input shaft. A motor-generator is rotatably coupled to the differential. The motor-generator has a

An example arrangement for driving a turbomachine includes an input shaft that is configured to rotate a rotor of the turbomachine through a hydraulic log and gear differential rotatable coupled to the input shaft. A motor-generator is rotatably coupled to the differential. The motor-generator has a motor mode of operation and a generator mode of operation. The motor-generator is configured to drive the input shaft through the hydraulic log and differential when the motor-generator is in the motor mode of operation. The input shaft is configured to drive the motor-generator through the hydraulic log and differential when the motor-generator is in the generator mode of operation.

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1. A hydraulic log valve assembly, comprising: a valve that controls a flow of fluid within a hydraulic log to provide a rotational output from the hydraulic log that is different than a rotational input to the hydraulic log, the hydraulic log including a first wobbler plate to adjust a stroke of a

1. A hydraulic log valve assembly, comprising: a valve that controls a flow of fluid within a hydraulic log to provide a rotational output from the hydraulic log that is different than a rotational input to the hydraulic log, the hydraulic log including a first wobbler plate to adjust a stroke of a first plurality of pistons, and a second wobbler plate to adjust a stroke of a second plurality of pistons, at least one of the first wobbler plate and the second wobbler plate adjustable from a first position where a portion of the first wobbler plate or second wobbler plate is tilted to a first side of a radial axis and a second position where the portion is tilted to an opposite second side of the radial axis, wherein the valve adjusts to control the flow of fluid between a higher pressure area of the hydraulic log and a lower pressure area of the hydraulic log, the first wobbler plate and the second wobbler plate adjusted independently from the valve; anda port plate, the first wobbler plate disposed on a first side of the port plate, the second wobbler plate disposed on an opposing second side of the port plate, the port plate having a first opening to permit flow from the first side to the second side, and a second opening to permit flow from the second side to the first side,wherein the first opening is in a higher pressure area of the hydraulic log and the second opening is in a lower pressure area of the hydraulic log,wherein the valve selectively permits flow from the higher pressure area to the lower pressure area. 2. The hydraulic log valve assembly of claim 1, wherein the valve comprises a biasing member. 3. The hydraulic log valve assembly of claim 1, wherein the valve comprises a solenoid. 4. The hydraulic log valve assembly of claim 1, wherein the hydraulic log rotatably couples a turbomachine rotor and a motor-generator. 5. The hydraulic log valve assembly of claim 1, wherein the hydraulic log includes a plurality of pistons each having a stroke that is adjusted with the first wobbler plate to provide the rotational output from the hydraulic log that is different than the rotational input to the hydraulic log. 6. The hydraulic log valve assembly of claim 5, wherein the hydraulic log further includes a second plurality of pistons within the hydraulic log assembly, and a stroke of the second plurality of pistons is configured to be adjusted with the second wobbler plate to provide the rotational output from the hydraulic log that is different than the rotational input to the hydraulic log. 7. The hydraulic log valve assembly of claim 5, wherein the valve is adjusted by a controller to selectively control flow of fluid within the hydraulic log. 8. The hydraulic log valve assembly of claim 1, wherein the hydraulic log assembly is rotatably coupled to a motor-generator that has a motor mode of operation and a generator mode of operation, wherein the motor-generator is configured to drive an input shaft through the hydraulic log assembly when the motor-generator is in the motor mode of operation, and the input shaft is configured to drive the motor-generator through the hydraulic log assembly when the motor-generator is in the generator mode of operation. 9. The hydraulic log valve assembly of claim 8, wherein the valve is configured to adjust the rotational input from the motor-generator to drive the input shaft when the motor-generator is in the motor mode of operation. 10. The hydraulic log valve assembly of claim 8, wherein the valve is configured to adjust the rotational input from the input shaft to provide a rotational output that drives the motor-generator when the motor-generator is in the generator mode of operation. 11. A gas turbine engine assembly, comprising: a motor-generator;a compressor rotor;a hydraulic log that receives a rotational input from one of the motor-generator or the compressor rotor, and provides a rotational output to the other of the motor-generator or the compressor rotor;a valve that adjusts to control the flow of fluid between a higher pressure area of the hydraulic log and a lower pressure area of the hydraulic log to selectively adjust the speed of the rotational output relative to the speed of rotational input,the hydraulic log including a first wobbler plate to adjust a stroke of a first plurality of pistons, and a second wobbler plate to adjust a stroke of a second plurality of pistons, at least one of the first wobbler plate and the second wobbler plate adjustable from a first position where a portion of the first wobbler plate or second wobbler plate is tilted to a first side of a radial axis and a second position where the portion is tilted to an opposite second side of the radial axis, wherein the valve controls the flow of fluid to adjusts the speed of the rotational output relative to the rotational input independently from the first and second plurality of pistons, the first wobbler plate and the second wobbler plate adjustable independently from the valve; anda port plate, the first wobbler plate disposed on a first side of the port plate, the second wobbler plate disposed on an opposing second side of the port plate, the port plate having a first opening to permit flow from the first side to the second side, and a second opening to permit flow from the second side to the first side,wherein the first opening is in the higher pressure area of the hydraulic log and the second opening is in the lower pressure area of the hydraulic log,wherein the valve selectively permits flow from the higher pressure area to the lower pressure area. 12. The gas turbine engine assembly of claim 11, wherein the hydraulic log comprises a first plurality of pistons and a second plurality of pistons, the first and the second plurality of pistons configured to selectively adjust the speed of the rotational output relative to the rotational input. 13. A method of driving components within a turbomachine, comprising: providing a first rotational input to a hydraulic log using a motor-generator when the motor-generator is in a motor mode of operation; andusing a valve that controls flow within a hydraulic log to adjust the first rotational input relative to a second rotational input that drives a compressor rotor, the hydraulic log including a first wobbler plate to adjust a stroke of a first plurality of pistons, and a second wobbler plate to adjust a stroke of a second plurality of pistons, at least one of the first wobbler plate and the second wobbler plate adjustable from a first position where a portion of the first wobbler plate or second wobbler plate is tilted to a first side of a radial axis and a second position where the portion is tilted to an opposite second side of the radial axis, wherein the first wobbler plate is disposed on a first side of a port plate, and the second wobbler plate is disposed on an opposing second side of the port plate;using the valve to control flow within the hydraulic log to adjust the first rotational input relative to the second rotational input without adjusting a position of the first wobbler plate or a position of the second wobbler plate;moving flow through a first port plate opening from a first side to an opposing, second side of a port plate;moving flow through a second port plate opening from the second side to the first side, the first opening in a higher pressure area of the hydraulic log than the second opening; andselectively adjusting flow between the higher pressure area and the lower pressure area using the valve, the valve an adjustable valve that is separate and distinct from both the first opening and the second opening. 14. The method of claim 13 further including, providing a third rotational input to the hydraulic log using the compressor rotor when the motor-generator is in a generator mode of operation; andusing the valve that controls flow within the hydraulic log to adjust the third rotational input and to provide a fourth rotational input that drives the motor-generator;wherein the hydraulic log comprises more than one wobbler plate. 15. The method of claim 13, wherein the using of the valve further comprises biasing the valve away from a flow permitting position to a flow restricting position via a biasing member, the biasing member biasing the valve toward a more restrictive flow position when pressure within the higher pressure area of the hydraulic log is below a threshold value, wherein pressure at or above the threshold value overcomes a biasing force of the biasing member to move the valve to a less restrictive flow position. 16. The hydraulic log valve assembly of claim 1, wherein the valve includes a biasing member that biases the valve toward a more restrictive flow position when pressure within the higher pressure area of the hydraulic log is below a threshold value, wherein pressure at or above the threshold valve overcomes a biasing force of the biasing member to move the valve to a less restrictive flow position. 17. The hydraulic log valve assembly of claim 1, wherein the valve is separate and distinct from the first opening and the second opening.