Automatic machinery fault diagnostic method and apparatus
First Claim
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1. A method of automatic fault diagnosis including:
- for each of a plurality of components of machines, carrying out the steps of;
for at least one possible fault in the component;
calculating for each of a plurality of symptoms for indicating a fault, a symptom value and a symptom severity value as the function of a reduced data set calculated from measured data as a measure of the deviation of the measured data from base line values;
obtaining a total fault symptom strength value from the symptom value and the symptom severity value indicating the strength of the fault; and
determining whether the total fault symptom strength value lies above a first predetermined value for that fault, recalling stored data relating to the total fault system strength value as a function of time, fitting the stored data to a trend line and predicting the time when the total fault symptom strength value will exceed a second predetermined value, selecting a message based on the total fault symptom strength value and the predicted time, and outputting the selected message.
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Abstract
The invention relates to an automatic fault diagnostic procedure for machines, such as steam, gas and hydro-turbines, generators, pumps, electrical motors, etc. For each of a plurality of components, for each of a number of possible faults, a total fault symptom strength value is calculated from measured data. If the value is above a predetermined value, the fault symptom strength is plotted and fitted to a trend line to determine an estimate of when the fault symptom strength will exceed a predetermined value. Output messages are then selected based on the fit.
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Citations
23 Claims
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1. A method of automatic fault diagnosis including:
- for each of a plurality of components of machines, carrying out the steps of;
for at least one possible fault in the component;
calculating for each of a plurality of symptoms for indicating a fault, a symptom value and a symptom severity value as the function of a reduced data set calculated from measured data as a measure of the deviation of the measured data from base line values;
obtaining a total fault symptom strength value from the symptom value and the symptom severity value indicating the strength of the fault; and
determining whether the total fault symptom strength value lies above a first predetermined value for that fault, recalling stored data relating to the total fault system strength value as a function of time, fitting the stored data to a trend line and predicting the time when the total fault symptom strength value will exceed a second predetermined value, selecting a message based on the total fault symptom strength value and the predicted time, and outputting the selected message. - View Dependent Claims (2, 3)
- for each of a plurality of components of machines, carrying out the steps of;
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4. A method of automatic fault diagnosis for machinery having a plurality of components, based on a reduced dataset calculated from data measured on the machinery, the method comprising:
- for at least one machine component, and for at least one fault that may occur in that component, carrying out the steps of;
calculating for each of a plurality of symptoms for indicating that fault, a symptom value and a symptom severity value as a function of the reduced dataset calculated from measured data as a measure of the deviation of the measured data from base line values;
combining the symptom values and symptom severity values to give a total fault symptom strength value indicating the strength of the fault; and
carrying out fault processing if the total fault symptom strength lies above a predetermined value. - View Dependent Claims (5, 6, 7, 8, 9, 10)
- for at least one machine component, and for at least one fault that may occur in that component, carrying out the steps of;
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11. A computer program system recorded on at least one data carrier including code for causing a computer system to carry out the steps of:
- for each of a plurality of components of machines, carrying out the steps of;
for at least one possible fault in the component;
calculating for each of a plurality of symptoms for indicating a fault, a symptom value and symptom severity value as a function of a reduced data set calculated from measured data as a measure of the deviation of the measured data from base line values;
obtaining a total fault symptom strength value from the symptom value and the symptom severity value indicating the strength of the fault stored in a database; and
if the total fault symptom strength value lies above a first predetermined value for that fault, recalling stored data relating to the total fault system strength value as a function of time, fitting the stored data to a trend line and predicting the time when the total fault symptom strength value will exceed a second predetermined value, selecting a message based on the total fault symptom strength value and the predicted time, and outputting the selected message. - View Dependent Claims (12, 13, 14, 15)
- for each of a plurality of components of machines, carrying out the steps of;
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16. A computer program system recorded on at least one data carrier including code for causing a computer system to:
- for a plurality of faults that may occur in one or more machine components, carrying out in turn for each in turn the steps of;
calculating for each of a plurality of symptoms for indicating that fault, a symptom value and a symptom severity value as a function of data stored in a database , the data being reduced data calculated from measured data;
combining the symptom value and symptom severity value to give a total fault symptom strength value indicating the strength of the fault; and
carrying out fault processing if the total fault symptom strength lies above a predetermined value. - View Dependent Claims (17, 18, 19, 20)
- for a plurality of faults that may occur in one or more machine components, carrying out in turn for each in turn the steps of;
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21. A system for automatically outputting a fault diagnosis for at least one possible fault, including code for carrying out the method of:
- for each of a plurality of components of machines, carrying out the steps of;
for at least one possible fault in the component;
calculating for each of a plurality of symptoms for indicating a fault, a symptom value and symptom severity value as the function of a reduced data set calculated from measured data as a measure of the deviation of the measured data from base line values;
obtaining a total fault symptom strength value from the symptom value and symptom severity value indicating the strength of the fault stored in a database; and
if the total fault symptom strength value lies above a first predetermined value for that fault, recalling stored data relating to the total fault system strength value as a function of time, fitting the stored data to a trend line and predicting the time when the total fault symptom strength value will exceed a second predetermined value, selecting a message based on the total fault symptom strength value and the predicted time, and outputting the selected message.
- for each of a plurality of components of machines, carrying out the steps of;
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22. A system for automatically outputting a fault diagnosis for at least one possible fault, including code for carrying out the method of:
- for a plurality of faults that may occur in one or more machine components, carrying out in turn for each in turn the steps of;
calculating for each of a plurality of symptoms for indicating that fault, a symptom value and a symptom severity value as a function of a reduced data set calculated from measured data as a measure of the deviation of the measured data from base line values combining the symptom value and a symptom severity value to give a total fault symptom strength value indicating the strength of the fault; and
carrying out fault processing if the total fault symptom strength lies above a predetermined value.
- for a plurality of faults that may occur in one or more machine components, carrying out in turn for each in turn the steps of;
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23. A computer program system recorded on at least one data carrier including code for causing a computer system to carry out the steps of:
- for each of a plurality of components of machines, carrying out the steps of;
for at least one possible fault in the component;
calculating a total fault symptom strength value from measured data, including a symptom value and the symptom severity value, indicating the strength of the fault stored in a database; and
if the total fault symptom strength value lies above a first predetermined value for that fault, recalling stored data relating to the total fault system strength value as a function of time, fitting the stored data to a trend line and predicting the time when the total fault symptom strength value will exceed a second predetermined value, selecting a message based on the total fault symptom strength value and the predicted time, and outputting the selected message.
- for each of a plurality of components of machines, carrying out the steps of;
Specification