Method and apparatus for the detection of reciprocating machine faults and failures
First Claim
1. A method for detection of reciprocating machine faults and failures, comprising the steps of:
- a) acquiring data representing velocity variation waveforms of a reciprocating machine having a plurality of cylinders;
b) transforming said acquired data using a computer to produce torque waveforms corresponding to the acquired velocity variation waveforms;
c) using a model-based optimization algorithm to obtain;
(i) a coefficient corresponding to the compression cycle for each cylinder, and(ii) a coefficient corresponding to the expansion cycle for each cylinder, wherein the coefficient corresponding to the expansion cycle is derived independently from the coefficient corresponding to the compression cycle;
d) presenting the compression coefficient, the expansion coefficient, and the transformed torque waveforms to a user to distinguish between compression faults and expansion faults for each cylinder; and
e) determining a reciprocating machine imbalance by detecting at least one of the compression fault and the expansion fault.
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Abstract
In a method and apparatus for detection of reciprocating machine faults and failures, data representing velocity variation waveforms of a reciprocating machine having a plurality of cylinders is acquired. The acquired data is transformed using a computer to produce torque waveforms corresponding to the acquired velocity variation waveforms. An optimization algorithm is used to obtain a number of parameters corresponding to the number of cylinders of the machine for both compression and expansion cycles of the machine in an independent manner and for each cylinder. The optimized parameters and the transformed torque waveforms are then presented to the user to identify each cylinder'"'"'s condition.
45 Citations
20 Claims
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1. A method for detection of reciprocating machine faults and failures, comprising the steps of:
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a) acquiring data representing velocity variation waveforms of a reciprocating machine having a plurality of cylinders; b) transforming said acquired data using a computer to produce torque waveforms corresponding to the acquired velocity variation waveforms; c) using a model-based optimization algorithm to obtain; (i) a coefficient corresponding to the compression cycle for each cylinder, and (ii) a coefficient corresponding to the expansion cycle for each cylinder, wherein the coefficient corresponding to the expansion cycle is derived independently from the coefficient corresponding to the compression cycle; d) presenting the compression coefficient, the expansion coefficient, and the transformed torque waveforms to a user to distinguish between compression faults and expansion faults for each cylinder; and e) determining a reciprocating machine imbalance by detecting at least one of the compression fault and the expansion fault. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for detection of reciprocating machine faults and failures, comprising the steps of:
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acquiring data representing velocity variation waveforms of a reciprocating machine having a plurality of cylinders; transforming said acquired data using a computer to produce torque waveforms corresponding to the acquired velocity variation waveforms; using a model-based optimization algorithm to obtain a compression coefficient for each cylinder and an expansion coefficient for each cylinder by iterating fic and fi '"'"' in the following equation to optimize ε
;
##EQU9## where ε
comprises a near-defined error constant between theoretical and test engine torque waveforms;
τ
(θ
) comprises torque from all cylinders superimposed;
τ
c (θ
i) comprises torque due to compression forces for each cylinder i;
fic comprises the compression coefficient for each cylinder i;
τ
'"'"'(θ
i) comprises torque due to expansion forces for each cylinder i;
fi '"'"' comprises the expansion coefficient for each cylinder i; and
n comprises the cylinder number;determining a reciprocating machine imbalance by detecting at least one of a compression fault and an expansion fault utilizing said compression coefficient and said expansion coefficient. - View Dependent Claims (12, 13, 14)
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15. A system for detection of reciprocating machine faults and failures, comprising:
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means for acquiring data representing velocity variation waveforms of a reciprocating machine having a plurality of cylinders; and processing means for (i) transforming said acquired data to produce torque waveforms corresponding to the acquired velocity variation waveforms, (ii) using a model-based optimization algorithm to obtain; a coefficient corresponding to the compression cycle for each cylinder, and a coefficient corresponding to the expansion cycle for each cylinder, the coefficient corresponding to the expansion cycle being derived independently from the coefficient corresponding to the compression cycle, (iii) outputting a first signal corresponding to the compression coefficient, and a second signal corresponding to the expansion coefficient. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification