Abstract: A method of monitoring a rotating component includes gathering an electrical signal from a sensor arranged adjacent a rotating component of an assembly. The electrical signal is transformed from a time domain into a frequency domain. The electrical signal is compared to an expected signal.

Abstract: A method of monitoring a rotating component includes gathering an electrical signal from a sensor arranged adjacent a rotating component of an assembly. The electrical signal is transformed from a time domain into a frequency domain. The electrical signal is compared to an expected signal.

Abstract: A system for resonance based cable compensation includes a first switch with a first terminal for connecting a first connection of a cable having a resonant circuit on an end of the cable opposite the first switch. The system also includes a second terminal for connecting a second connection of a cable that has its first connection connected to the first terminal. A logic component is operatively connected to control the first switch to selectively apply voltage pulses across the first and second terminals to generate a resonance signal in a cable connected to the terminals in order to compensate for equivalent cable capacitance.

Abstract: A system for resonance based cable compensation includes a first switch with a first terminal for connecting a first connection of a cable having a resonant circuit on an end of the cable opposite the first switch. The system also includes a second terminal for connecting a second connection of a cable that has its first connection connected to the first terminal. A logic component is operatively connected to control the first switch to selectively apply voltage pulses across the first and second terminals to generate a resonance signal in a cable connected to the terminals in order to compensate for equivalent cable capacitance.

Abstract: A dual-pump fuel system for use with a gas turbine engine comprises a fuel metering system, a mechanical fuel pump, an electric fuel pump and an engine controller. The fuel metering system is configured to dispense fuel flow to the engine based on operational needs of the gas turbine engine. The mechanical fuel pump is configured to deliver fuel to the metering system dependent on operational speeds of the engine. The electric fuel pump is configured to deliver fuel directly to the engine independent of operation of the engine. The engine controller is connected to the metering system and the electric fuel pump and is configured to cause the electric fuel pump to deliver fuel to the engine to start and operate the engine until the engine operates the mechanical fuel pump to deliver fuel to the metering system sufficient to sustain operation of the engine.

Abstract: A dual-pump fuel system for use with a gas turbine engine comprises a fuel metering system, a mechanical fuel pump, an electric fuel pump and an engine controller. The fuel metering system is configured to dispense fuel flow to the engine based on operational needs of the gas turbine engine. The mechanical fuel pump is configured to deliver fuel to the metering system dependent on operational speeds of the engine. The electric fuel pump is configured to deliver fuel directly to the engine independent of operation of the engine. The engine controller is connected to the metering system and the electric fuel pump and is configured to cause the electric fuel pump to deliver fuel to the engine to start and operate the engine until the engine operates the mechanical fuel pump to deliver fuel to the metering system sufficient to sustain operation of the engine.

Abstract: A method and apparatus for measuring relative deflection of interspaced toothed wheels or their equivalents on a less than once per revolution basis. Deflection measurement errors due to wheel imperfections are measured and stored for each tooth pair and later used to correct deflection measurement on a tooth pair basis. The apparatus includes a sensing circuit which is operative to provide a signal when teeth pass a fixed position, a duty cycle to digital hardware circuit which is operative to measure the duration of the state of the sensing circuit signal, and a computer which is operative to compute, store, and apply correction factors in response to the duration of the state of the signal.