Shaft shear detection through shaft oscillation
First Claim
1. A method for detecting a shear of a rotating shaft of a gas engine, the shaft positioned between a source and a load, the method comprising:
- storing in memory a shaft oscillation signature determined as a function of known characteristics of the shaft and associated with a shaft shear event, the shaft oscillation signature comprises a signature modulation frequency;
monitoring a rotational speed of the shaft comprising obtaining a signal from a speed sensing device;
detecting from the rotational speed an oscillation wave superimposed on the rotational speed, the oscillation wave having a wave modulation frequency and a wave modulation amplitude;
comparing the shaft oscillation signature to the oscillation wave comprising comparing the signature modulation frequency to the wave modulation frequency;
detecting the shaft shear event when the oscillation wave corresponds to the shaft oscillation signature; and
in response to detecting the shaft shear event, commanding a fuel shutoff of the engine.
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Accused Products
Abstract
There is described a shaft shear event detection method. The method comprises storing in memory a shaft oscillation signature determined as a function of known characteristics of the shaft and associated with a shaft shear event; monitoring a rotational speed of the shaft; detecting from the rotational speed an oscillation wave superimposed on the rotational speed, the oscillation wave having a wave modulation frequency and a wave modulation amplitude; comparing the oscillation signature to the oscillation wave; and detecting the shaft shear event when the oscillation wave corresponds to the oscillation signature.
24 Citations
19 Claims
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1. A method for detecting a shear of a rotating shaft of a gas engine, the shaft positioned between a source and a load, the method comprising:
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storing in memory a shaft oscillation signature determined as a function of known characteristics of the shaft and associated with a shaft shear event, the shaft oscillation signature comprises a signature modulation frequency; monitoring a rotational speed of the shaft comprising obtaining a signal from a speed sensing device; detecting from the rotational speed an oscillation wave superimposed on the rotational speed, the oscillation wave having a wave modulation frequency and a wave modulation amplitude; comparing the shaft oscillation signature to the oscillation wave comprising comparing the signature modulation frequency to the wave modulation frequency; detecting the shaft shear event when the oscillation wave corresponds to the shaft oscillation signature; and in response to detecting the shaft shear event, commanding a fuel shutoff of the engine. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A system for detecting a shear of a rotating shaft of a gas engine, the shaft positioned between a source and a load, the system comprising:
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a memory storing a shaft oscillation signature determined as a function of known characteristics of the shaft and associated with a shaft shear event, wherein the shaft oscillation signature comprises a signature modulation frequency; and at least one of; (a) at least one processor configured for executing program code; and (b) a circuit; the at least one of (a) and (b) configured for; monitoring a rotational speed of the shaft comprising obtaining a signal from a speed sensing device; detecting from the rotational speed an oscillation wave superimposed on the rotational speed, the oscillation wave having a wave modulation frequency and a wave modulation amplitude; comparing the oscillation signature to the oscillation wave comprising comparing the signature modulation frequency to the wave modulation frequency; detecting the shaft shear event when the oscillation wave corresponds to the oscillation signature; and in response to detecting the shaft shear event, commanding a fuel shutoff of the engine. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A system for detecting a shear of a rotating shaft of a gas engine, the shaft positioned between a source and a load, the system comprising:
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a memory storing a shaft oscillation signature determined as a function of known characteristics of the shaft and associated with a shaft shear event, the shaft oscillation signature comprises a signature modulation frequency; a speed sensing device for monitoring a rotational speed of the shaft; at least one processor configured for executing program code for; detecting from the rotational speed an oscillation wave superimposed on the rotational speed, the oscillation wave having a wave modulation frequency and a wave modulation amplitude; comparing the oscillation signature to the oscillation wave comprising comparing the signature modulation frequency to the wave modulation frequency; detecting the shaft shear event when the oscillation wave corresponds to the oscillation signature; and in response to detecting the shaft shear event, commanding a fuel shutoff of the engine.
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Specification