Principal component analysis based fault classification
First Claim
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1. A system for identifying events in a process, the system comprising:
- a controller coupled to sensors monitoring a process;
a principal component analysis model receiving data from the sensors monitoring the process and reducing a number of variables associated with the data from the sensors, the model further comprising;
a training module that is run on historical data to create a pool of vectors with values for the variables, wherein the training module further creates clusters of bad actors from the values based on statistics and associates the clusters with known events; and
a run time module that receives incoming data from the sensors, calculates statistics, determines if events are occurring, and identifies clusters to identify events.
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Abstract
Principal Component Analysis (PCA) is used to model a process, and clustering techniques are used to group excursions representative of events based on sensor residuals of the PCA model. The PCA model is trained on normal data, and then run on historical data that includes both normal data, and data that contains events. Bad actor data for the events is identified by excursions in Q (residual error) and T2 (unusual variance) statistics from the normal model, resulting in a temporal sequence of bad actor vectors. Clusters of bad actor patterns that resemble one another are formed and then associated with events.
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Citations
15 Claims
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1. A system for identifying events in a process, the system comprising:
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a controller coupled to sensors monitoring a process; a principal component analysis model receiving data from the sensors monitoring the process and reducing a number of variables associated with the data from the sensors, the model further comprising; a training module that is run on historical data to create a pool of vectors with values for the variables, wherein the training module further creates clusters of bad actors from the values based on statistics and associates the clusters with known events; and a run time module that receives incoming data from the sensors, calculates statistics, determines if events are occurring, and identifies clusters to identify events. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A system for identifying events in a process, the system comprising:
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means for monitoring a process via sensors; means for receiving data from the sensors monitoring the process and reducing a number of variables associated with the data from the sensors to produce a principal component analysis model, the model further comprising; means run on historical data for creating a pool of vectors with values for the variables, and creating clusters of bad actors from the values based on statistics and associates the clusters with known events; and means for receiving incoming data from the sensors, calculating statistics, determining if events are occurring, and identifying clusters to identify events.
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Specification