Shaft shear detection through shaft oscillation
AssigneePratt & Whitney Canada Corp.
InventorAntwan Shenouda
Life of this patent
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Abstract
There is described a shaft shear event detection method. The method comprises obtaining a demodulated waveform of a shaft oscillation wave superimposed on a shaft rotational speed signal, comparing the amplitude to an amplitude threshold, detecting oscillation when the amplitude threshold is exceeded for a plurality of samples, and detecting a shaft shear when oscillation continues for a predetermined time limit.
Claims13
A method for detecting a shear of a rotating shaft of a gas turbine engine, the shaft positioned between a source and a load, the method comprising:
- receiving a speed sensor signal from a speed sensing device;
- determining, from the speed sensor signal, a demodulated waveform of a shaft oscillation wave superimposed on a shaft rotational speed signal, the waveform having an amplitude and a frequency;
- comparing the amplitude of the waveform to an amplitude threshold;
- detecting an oscillation of the shaft when the amplitude threshold is exceeded for a plurality of samples;
- detecting a shear of the rotating shaft when oscillation continues for a predetermined time limit;
- and
- in response to detecting the shear of the rotating shaft, commanding a fuel shutoff of the gas turbine engine.
A system for detecting a shear of a rotating shaft of a gas turbine engine, the shaft positioned between a source and a load, the system comprising:
- a processing unit;
- and
- a non-transitory computer-readable memory having stored thereon program instructions executable by the processing unit for:
- receiving a speed sensor signal from a speed sensing device;
- determining, from the speed sensor signal, a demodulated waveform of a shaft oscillation wave superimposed on a shaft rotational speed signal, the waveform having an amplitude and a frequency;
- comparing the amplitude of the waveform to an amplitude threshold;
- detecting an oscillation of the shaft when the amplitude threshold is exceeded for a plurality of samples;
- detecting a shear of the rotating shaft when oscillation continues for a predetermined time limit;
- and
- in response to detecting the shear of the rotating shaft, commanding a fuel shutoff of the gas turbine engine.
A non-transitory computer-readable medium having stored thereon program instructions for detecting a shear of a rotating shaft of a gas turbine engine, the shaft positioned between a source and a load, the program instructions executable by a processing unit for:
- receiving a speed sensor signal from a speed sensing device;
- determining, from the speed sensor signal, a demodulated waveform of a shaft oscillation wave superimposed on a shaft rotational speed signal, the waveform having an amplitude and a frequency;
- comparing the amplitude of the waveform to an amplitude threshold;
- detecting an oscillation of the shaft when the amplitude threshold is exceeded for a plurality of samples;
- detecting a shear of the rotating shaft when oscillation continues for a predetermined time limit;
- and
- in response to detecting the shear of the rotating shaft, commanding a fuel shutoff of the gas turbine engine.
Dependencies are inferred from the claim text.