A system comprises a rotary apparatus, a control law and a processor. The rotary apparatus comprises a rotor and a housing forming a gas path therebetween, and the control law controls flow along the gas path. The processor comprises an output module, a plurality of temperature modules, a thermodynamic module, a comparator and an estimator. The output module generates an output signal as a function of a plurality of rotor and housing temperatures defined along the gas path, and the temperature modules determine time derivatives of the rotor and housing temperatures. The thermodynamic module models boundary conditions for the gas path, and the comparator determines errors in the boundary conditions. The estimator estimates the rotor and housing temperatures based on the time derivatives, such that the errors are minimized and the flow is controlled.

High fidelity integrated heat transfer and clearance in component-level dynamic turbine system control

A control system comprises an actuator, a control law and a processor. The actuator positions a control surface and the control law controls the actuator. The processor comprises an open loop module, a corrector, a comparator, and an estimator, and generates an output vector to direct the control law. The open loop module generates the output vector as a function of a state vector and an input vector. The corrector generates a corrector vector as a function of the output vector. The comparator generates an error vector by comparing the corrector vector to the input vector. The estimator generates the state vector as a function of the error vector, such that the error vector is minimized.

Design and control of engineering systems utilizing component-level dynamic mathematical model with multiple-input multiple-output estimator

The time responsiveness and engine stability for an acceleration and deceleration engine transient is enhanced by a control mechanism that synchronously adjusts fuel flow and high pressure compressor vane position as a function of corrected low pressure compressor speed in a twin spool axial flow turbine power plant. The acceleration and deceleration mode is targeted by power lever position and the target is attained by adjusting the vane position at a constant high pressure compressor speed and returned to a fuel efficient and engine stable steady state operating line by concomittantly adjusting fuel flow and vane position.

Control of high compressor vanes and fuel for a gas turbine engine

A system comprises an apparatus, an actuator and a processor. The apparatus defines a flow path through an aperture, the aperture defines a pressure drop along the flow path, and the actuator regulates fluid flow across the pressure drop. The processor comprises a flow module, a comparator, an estimator and a control law. The flow module maps a flow curve relating a flow parameter to a pressure ratio, and defines a solution point located on the flow curve and a focus point located off the flow curve. The comparator generates an error as a function of a slope defined between the focus and solution points. The estimator moves the solution point along the flow curve, such that the error is minimized. The control law directs the actuator to position the control element, such that the flow parameter describes the fluid flow and the pressure ratio describes the pressure drop.

Robust flow parameter model for component-level dynamic turbine system control

An actuator cap (10) for a dispenser includes a housing having first and second ends. The first end is adapted to be retained on an aerosol container (30) having a valve stem. A conduit is provided having an inlet adapted to receive the valve stem of the container and to hold the valve stem in an actuated position to open a valve assembly within the container. A solenoid valve (240) is in fluid communication with the conduit and a discharge orifice. The solenoid valve is transitioned from a closed state to an open state by a signal generated by a controller to provide a fluid path between the conduit and the discharge orifice. The controller is adapted to generate the signal in response to the manual depression of a trigger (86) retained on the housing by a living hinge (88).

Actuator cap for a spray device

An electrohydraulic proportional actuator for converting an electrical input signal to proportional mechanical output. Fluid power may be derived from pressurized fuel or lubricating oil of an associated engine. The actuator may be used to drive any engine function requiring modulated control. The mechanical output is proportional to the electrical input. The actuator includes mechanical feedback to linearize the response function, thus eliminating the need for closed loop operation of the system in which the actuator is used. Both linear and rotary actuators are disclosed in various embodiments. Each type is capable of operation with either a proportional solenoid and valve or a force rebalance solenoid and valve.

Electrohydraulic proportional actuator apparatus

A recuperated gas turbine engine fuel and guide vane control which controls fuel flow and guide vane position during engine idling and acceleration to minimize fuel consumption while providing fast acceleration for a ground vehicle.

Variable geometry gas turbine engine fuel and guide vane control

The surface vehicle drive motor (30) comprises a free running turbine with a recuperation facility. It has a gas generator section (52) and a power turbine (54) fitted on a shaft separately from the gas generator (52). A recuperator (56) leads back exhaust gases in order to heat the compressed flow medium prior to its introduction into the combustion process. A fuel source is available, and the fuel control incorporated involves a fuel pump, and an operating valve, the latter governing the fuel throughput during acceleration or slowing down of the motor. A further control affects the variable positions of stator blades incorporated in the power turbine section (54). An electronic control receives input parameter signals, processes them, and produces output control signals to the fuel governor and the blade operating control.

Electronic control in surface vehicle gas turbine engine - receives and processes input parameter signals, and transmits control signals to fuel and blade operating controls

Lewis L D

Papers

Electrohydraulic proportional actuator apparatus

Variable geometry gas turbine engine fuel and guide vane control

Electronic control in surface vehicle gas turbine engine - receives and processes input parameter signals, and transmits control signals to fuel and blade operating controls