Device and method for regulating a flow rate of gas intended to supply a propulsion apparatus for a spacecraft comprising xenon tank, a circuit comprising a withdrawing pipe having an upstream end connected to the tank and a downstream end connected to a propulsion member, the withdrawing pipe comprising an isolation first valve, a regulating second valve and a member for measuring the pressure downstream of the regulating second valve. The regulating second valve regulates the flow rate and/or the determined pressure according to the pressure measured. The regulating second valve is a proportional valve of electrically operated variable throughout PCV type.

A system for controlling a turbine is disclosed. The system includes a turbine control fuel governor that has a plurality of VCPIDs operating in parallel with one another. Each VCPID is associated with a respective turbine parameter and one or more external parameters. Each VCPID incorporates feedback from the parallel operating VCPIDs to feed an integral term of a current VCPID in the following manner: a previous derivative gain and a previous proportional gain are summed and subtracted from a selected output for the turbine to yield a result, and the result is input to an integral gain portion of the current VCPID.

A system includes a gas turbine engine and a controller operable to determine a closing threshold with respect to an upper limit and an opening threshold with respect to a lower limit of a movement range of an effector of the gas turbine engine based on an on-board model, where the upper limit and the lower limit are defined for a target parameter of the gas turbine engine. The controller determines a projected state of the target parameter absent a correction command to the effector, applies a closing correction to the effector based on determining that the projected state of the target parameter would result in being above the closing threshold, and applies an opening correction to the effector based on determining that the projected state of the target parameter would result in being below the opening threshold.

Systems and methods for controlling a gas turbine engine are provided. The system comprises an interface to a fuel flow metering valve for controlling a fuel flow to the engine in response to a fuel flow command and a controller connected to the interface and configured for outputting the fuel flow command to the fuel flow metering valve in accordance with a required fuel flow. The controller comprises a feedforward controller configured for receiving a requested engine speed and acceleration, obtaining a steady-state fuel flow for the requested engine speed and a relationship between fuel flow and gas generator speed, and determining the required fuel flow to obtain the requested engine acceleration as a function of the requested engine speed, the steady-state fuel flow, and the relationship between fuel flow and gas generator speed.

A system for keep out zone control includes a gas turbine engine and a controller operable to determine a closing threshold with respect to an upper limit and an opening threshold with respect to a lower limit of a movement range of an effector of the gas turbine engine based on an on-board model, where the upper limit and the lower limit define a keep out zone of a target parameter of the gas turbine engine. The controller determines a projected state of the target parameter absent a correction command to the effector, applies a closing correction to the effector based on determining that the projected state of the target parameter would result in being above the closing threshold, and applies an opening correction to the effector based on determining that the projected state of the target parameter would result in being below the opening threshold.

A system for controlling a turbine is disclosed. The system includes a turbine control fuel governor that has a plurality of VCPIDs operating in parallel with one another. Each VCPID is associated with a respective turbine parameter and one or more external parameters. Each VCPID incorporates feedback from the parallel operating VCPIDs to feed an integral term of a current VCPID in the following manner: a previous derivative gain and a previous proportional gain are summed and subtracted from a selected output for the turbine to yield a result, and the result is input to an integral gain portion of the current VCPID.

A system for keep out zone control includes a gas turbine engine and a controller operable to determine a closing threshold with respect to an upper limit and an opening threshold with respect to a lower limit of a movement range of an effector of the gas turbine engine based on an on-board model, where the upper limit and the lower limit define a keep out zone of a target parameter of the gas turbine engine. The controller determines a projected state of the target parameter absent a correction command to the effector, applies a closing correction to the effector based on determining that the projected state of the target parameter would result in being above the closing threshold, and applies an opening correction to the effector based on determining that the projected state of the target parameter would result in being below the opening threshold.

A control device for a gas turbine include: a target value calculation part configured to calculate a control target value being a target value of an output of the gas turbine; and a command value calculation part configured to calculate a fuel command value on the basis of a deviation between the control target value and an actual output value of the gas turbine. The target value calculation part is configured to: set the control target value to a value which is greater than an output demand value of the gas turbine immediately before a difference between the output demand value and the actual output value becomes not greater than a threshold; and subtract the control target value from the value after the difference becomes not greater than the threshold.

A fuel supply control device (8) is configured to control a fuel supply pump (3) on the basis of a front-rear differential pressure across a metering valve for a fuel supply amount, which is detected by a differential pressure gauge (7), using parallel flow passages of an orifice (6) and a pressurizing valve (5) as the metering valve. The fuel supply control device (8) includes a first control amount generation unit (8a) that is configured to generate a first control amount (S1) on the basis of the front-rear differential pressure, a second control amount generation unit (8b, 8c, and 8d) that is configured to generate a second control amount (S2) on the basis of the rotation speed of the fuel supply pump (3), a control amount selection unit (8f) that is configured to alternatively select the first control amount (S1) or the second control amount (S2) on the basis of the rotation speed, a subtracter (8g) that is configured to calculate a deviation of the output of the control amount selection unit (8f) from a control target value, and a control calculation unit (8h) that is configured to calculate an operation amount of the fuel supply pump (3) on the basis of the output of the subtractor (8g). The control amount selection unit (8f) is configured to select the first control amount (S1) in a case where the rotation speed is equal to or lower than a predetermined threshold and select the second control amount (S2) instead of the first control amount (S1) in a case where the rotation speed exceeds the threshold.

A blade tip clearance control apparatus is disclosed. The apparatus includes a rotor, a hydraulic clearance control device, and a cylinder locking device. The rotor includes a thrust collar, a pair of thrust bearings axially supporting the thrust collar, and a plurality of radially extending blades. The hydraulic clearance control device includes a first hydraulic cylinder moving any one of the pair of thrust bearings in a forward axial direction and a second hydraulic cylinder moving the other thrust bearing in the reverse axial direction. The cylinder locking device includes a first locking device restricting a forward moving distance of the first hydraulic cylinder and a second locking device restricting a reverse moving distance of the second hydraulic cylinder.