Abstract: A modular fluid-driven linear actuator comprising an actuator support comprising a first part and a second part configured for relative linear movement, wherein the actuator support is configured to hold a plurality of removable actuator modules in parallel and in respective module-receiving locations defined between the first part and the second part. At least one actuator module is removably installed in the actuator support and held in a respective module-receiving location of the plurality. A first fluid manifold is configured to provide a drive fluid to each actuator module when received in a respective module-receiving location, to act on a piston of the actuator module having a respective piston area to drive the piston in a first direction. A total piston area of the modular actuator is variable by installing and uninstalling actuator modules in the actuator support.

Abstract: A modular fluid-drive rotary actuator comprising a housing defining a chamber, a rotary driver disposed within the chamber. The rotary driver may comprise a modular driver assembly of at least two drive wheels, and/or the housing may comprise at least a first end part, a second end part and an interchangeable intermediate part disposed between them. There is also disclosed a method of reconfiguring a fluid-driven rotary actuator by replacement, addition or removal of one or more drive wheels or housing parts.

Abstract: There is disclosed a stator vane actuation arrangement comprising a plurality of stator vane assemblies. The stator vane actuation assemblies comprise a stator vane having a spindle and being rotatable about a spindle axis. The stator vane actuation assemblies also comprise a casing arranged around the spindle and moveable relative to the spindle. A linear-to-rotary mechanism is defined between the casing and the spindle such that linear movement of the casing along the spindle axis causes rotation of the spindle about the spindle axis. An actuator is included for linearly moving the casing relative the spindle along the spindle axis. There is also disclosed a gas turbine engine comprising the stator vane actuation arrangement and a method of actuating a plurality of variable stator vanes comprising actuating each of the plurality of stator vanes to rotate with the stator vane actuation arrangement.

Abstract: A method of controlling settings of one or more actuatable gas turbine engine components includes: providing a first matrix which relates reduction in the operational parameter maximum value during the transient manoeuvre to settings of the component(s); providing a second matrix which relates the operational parameter maximum values attained during the transient manoeuvre: time to attain the maximum value after transient manoeuvre initiation, and operational parameter rate of change at the time of the maximum value; monitoring the engine in operation to identify a start of a transient manoeuvre; predicting, on the basis of the second matrix maximum values, an overshoot operational parameter amount during the identified transient manoeuvre and a time the overshoot occurrence; selecting a setting, using the first matrix, to eliminate the predicted overshoot; and applying the setting to the component(s) for a predetermined period around the predicted time of occurrence to reduce or avoid the overshoot.

Abstract: A method of controlling settings of one or more actuatable gas turbine engine components includes: providing a first matrix which relates reduction in the operational parameter maximum value during the transient manoeuvre to settings of the component(s); providing a second matrix which relates the operational parameter maximum values attained during the transient manoeuvre: time to attain the maximum value after transient manoeuvre initiation, and operational parameter rate of change at the time of the maximum value; monitoring the engine in operation to identify a start of a transient manoeuvre; predicting, on the basis of the second matrix maximum values, an overshoot operational parameter amount during the identified transient manoeuvre and a time the overshoot occurrence; selecting a setting, using the first matrix, to eliminate the predicted overshoot; and applying the setting to the component(s) for a predetermined period around the predicted time of occurrence to reduce or avoid the overshoot.