摘要:
A variable-section nozzle for an aircraft nacelle includes a deformable portion of which is movable between a narrow section position and a wide section position. In particular, the variable-section nozzle includes piezoelectric actuators and a controller to control the piezoelectric actuators in order to displace the deformable portion between the narrow and wide section positions. The piezoelectric actuators can be disposed on at least one faces of the deformable portion or be disposed end-to-end to form actuating rods.
摘要:
The basic flow rate for any given output is controlled by main valves driven by a relatively slow electrical drive having a high operating force. Small output changes are rapidly corrected by error valves driven by an electrical system having a very short time constant and a relatively low operating force. Only one error valve is used for correcting flow rate in conjunction with any of the main valves. All valves operate under spring pressure, so that release of a mechanical coupling coupling the valves to the drive system causes a very rapid closing of the valves.
摘要:
A limit switch 6 is placed on an end portion of the trip rod 4, which converts the mechanical deviation of the trip rod 4 into an electrical signal. The electrical signal from the limit switch 6 is transmitted to quick acting solenoid valves placed in a drive unit for a steam valve via a sequence circuit device, and then the steam valve is closed. Accordingly, an equipment structure can be simplified and reliability can be improved as compared to conventional arts.
摘要:
A control device for turbines with speed and load control, in which the load control includes an integrator with or without an output value limiter. The speed control and the load control are functionally independent of each other over the entire working range. The speed control likewise includes an integrator, and the outputs of the two controls are conveyed to a MIN-member as input signals while the smaller input becomes the output signal of the MIN-member and takes over the positioning of the turbine inlet valve.
摘要:
A flow control valve for a control system such as a gas turbine engine system controls fluid flow by adjusting a valve opening in accordance with an error signal and controls a pressure difference between the upstream and downstream sides of the valve in accordance with a command signal.
摘要:
The regulator having a P-member and an I-member uses a timing means to delay the desired value signal prior to subtraction of the delayed signal from the received actual value signal. The resultant signal is then delivered to the I-member. A further P-member is also used to receive the desired value signal and to deliver the signal for addition to the superimposed signals from the first-named P-member and I-member in order to produce a load-control signal.
摘要:
A steam supply control device is disclosed which is adapted for use with an electro-hydraulic governor so as to control the rotational speed of an auxiliary turbine such as a cargo oil or ballast pump turbine, a generator turbine or the like. The device can prevent the excessive momentary increase in rotational speed even in case of a sudden decrease in load such as air draw in pump, and can also control an extremely low rotational speed.
摘要:
In a steam turbine control device wherein a steam control valve is controlled by a main control system responsive to an opening command signal from a speed control or a load control of the turbine, there are provided a throttle governing feedback circuit and a nozzle governing circuit which are connected in parallel and respond to the opening of the regulator valve to correct the opening thereof and a control circuit operative to gradually vary the difference signal between the feedback signals of the throttle governing and nozzle governing feedback circuits and to feed back the gradually varying difference signal to the main control system to switch the control of the steam regulator valve from the throttle governing operation to the nozzle governing operation without causing rapid increase of the steam flowrate. The control device is also provided with means to detect the rate of change in the steam pressure on the downstream side of the regulator valve.
摘要:
Disclosed herein is a bleeder and back pressure turbine control system composed, essentially, of control devices respectively for rotational speed control, back pressure control, and bleeder pressure control, each control device detecting the required value and sending out a control signal; switching means operable for changing turbine operation to a constant speed operation or to a constant pressure operation, the back pressure control device being disconnected from the control system in the former operation, and the rotating speed control device being disconnected from the control system in the latter operation; and electrohydraulic control devices which, in the former operation, operate a main steam-regulating valve and a bleeder-regulating valve in the same directions under the control of the speed control device, and in the reversing directions under the control of the bleeder pressure control device, and which, in the latter operation, operate merely the main steam-regulating valve under the control of the back pressure control device and the bleeder pressure control device.