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An actuation system to control clearance in a turbomachine including a shaft bearing including at least one axially displaceable thrust bearing. The axially displaceable thrust bearing configured to axially displace a rotating component relative to a stationary component to control the clearance the

An actuation system to control clearance in a turbomachine including a shaft bearing including at least one axially displaceable thrust bearing. The axially displaceable thrust bearing configured to axially displace a rotating component relative to a stationary component to control the clearance therebetween. The system further including a plurality of actuators coupled to the at least one axially displaceable thrust bearing and configured to actuate the at least one axially displaceable thrust bearing to control the clearance. The plurality of actuators is configured to deactivate a diametrically opposed actuator in the event of an actuator failure to maintain zero moment. In a topography network, each diametrically opposed actuator pair is coupled to a single control line. In an alternate topography network, alternating actuators are coupled to a single control line. In addition, a method of actuating a thrust bearing to control clearance in a turbomachine is disclosed.

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1. An actuation system to control clearance in a turbomachine comprising: a shaft bearing including at least one axially displaceable thrust bearing configured to axially displace a rotating component relative to a stationary component to control the clearance therebetween; anda plurality of actuato

1. An actuation system to control clearance in a turbomachine comprising: a shaft bearing including at least one axially displaceable thrust bearing configured to axially displace a rotating component relative to a stationary component to control the clearance therebetween; anda plurality of actuators coupled to the at least one axially displaceable thrust bearing and configured to actuate the at least one axially displaceable thrust bearing to control the clearance,whereby the plurality of actuators are configured to deactivate a diametrically opposed actuator in the event of an actuator failure to maintain zero moment. 2. The actuation system as claimed in claim 1, including at least three points of actuation using one or more actuators. 3. The actuation system as claimed in claim 1, wherein the plurality of actuators are circumferentially arranged relative to the at least one axially displaceable thrust bearing, configured substantially symmetrically about the thrust bearing and coupled thereto via a plurality of control lines. 4. The actuation system as claimed in claim 3, wherein the plurality of actuators are coupled to the plurality of control lines defining a topography network wherein in the event of an actuator failure, a diametrically opposed actuator is deactivated. 5. The actuation system as claimed in claim 4, wherein each diametrically opposed actuator pair is coupled to a single control line. 6. The actuation system as claimed in claim 5, wherein each pair of actuators is connected to a separate control line. 7. The actuation system as claimed in claim 4, wherein alternating actuators are coupled to a single control line. 8. The actuation system as claimed in claim 7, wherein a first group of alternating actuators is coupled to a first control line and a second group of alternating actuators is coupled to a second control line. 9. The actuation system as claimed in claim 3, wherein the plurality of actuators are hydraulic actuators coupled to a plurality of hydraulic control lines defining a topography network. 10. A turbomachine, comprising: a stationary component including an inner wall;a rotating component carrying a plurality of rotor blades each having a blade tip facing towards the inner wall and having a clearance formed between each said blade tip and said inner wall;a shaft bearing including at least one axially displaceable thrust bearing configured to axially displace the rotating component relative to the stationary component to control the clearance therebetween; anda plurality of actuators circumferentially arranged relative to the thrust bearing and coupled thereto via a plurality of control lines, the plurality of actuators configured to actuate the at least one axially displaceable thrust bearing to control the clearance and to deactivate a diametrically opposed actuator in the event of an actuator failure to maintain zero moment. 11. The turbomachine as claimed in claim 10, wherein the plurality of actuators are circumferentially arranged relative to the at least one axially displaceable thrust bearing and coupled thereto via a plurality of actuation lines to define a topography network. 12. The turbomachine as claimed in claim 11, wherein each diametrically opposed actuator pair is coupled to a single control line. 13. The turbomachine as claimed in claim 12, wherein each pair of actuators is connected to a separate control line. 14. The turbomachine as claimed in claim 11, wherein alternating actuators are coupled to a single control line. 15. The turbomachine as claimed in claim 14, wherein a first group of alternating actuators is coupled to a first control line and a second group of alternating actuators is coupled to a second control line. 16. The turbomachine as claimed in claim 10, wherein the clearance is one of a radial clearance or an axial clearance between the rotating component and a stationary component. 17. A method of actuating a thrust bearing to control clearance in a turbomachine comprising: determining a relationship between a reliability of an actuation system relative to a reliability of a plurality of actuators coupled to a shaft bearing via the actuation system, wherein the shaft bearing includes at least one axially displaceable thrust bearing configured to axially displace a rotating component relative to a stationary component to control the clearance therebetween;determine a topography network for actuation of the plurality of actuators based on the determined reliability relationship between the actuation system and the actuators;axially actuating the thrust bearing via a mechanical support configured between the actuators and the thrust bearing,whereby the plurality of actuators are configured to deactivate a diametrically opposed actuator in the event of an actuator failure to maintain zero moment. 18. The method of actuating a thrust bearing as claimed in claim 17, wherein the plurality of actuators are coupled to a plurality of actuation lines defining a topography network wherein in the event of an actuator failure, a diametrically opposed actuator is deactivated. 19. The method of actuating a thrust bearing as claimed in claim 18, wherein each diametrically opposed actuator pair is coupled to a single control line. 20. The method of actuating a thrust bearing as claimed in claim 18, wherein alternating actuators are coupled to a single control line.