Principal component analysis based fault classification
First Claim
Patent Images
1. A computer implemented method of identifying events in a process, the method comprising:
- running, in a computer processor, a principal component analysis model on sensor data from the process;
calculating, using the computer processor, statistics related to the model;
determining, with the computer processor, if an event is occurring;
finding, using the computer processor, a nearest cluster of bad actors related to the event to identify the event;
differentiating, using the computer processor, a sensor that directly senses the event from a sensor that senses a residual of the event;
storing the found nearest cluster of bad actors in a computer storage device; and
further comprising for new bad actors;
identifying a sequence of cluster matches; and
correlating the sequence of cluster matches to known events; and
further comprising;
determining if a cluster needs to be split when new bad actors are added; and
splitting the cluster into two clusters using a goodness of fit algorithm.
0 Assignments
0 Petitions
Accused Products
Abstract
Principle 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.
-
Citations
16 Claims
-
1. A computer implemented method of identifying events in a process, the method comprising:
-
running, in a computer processor, a principal component analysis model on sensor data from the process; calculating, using the computer processor, statistics related to the model; determining, with the computer processor, if an event is occurring; finding, using the computer processor, a nearest cluster of bad actors related to the event to identify the event; differentiating, using the computer processor, a sensor that directly senses the event from a sensor that senses a residual of the event; storing the found nearest cluster of bad actors in a computer storage device; and further comprising for new bad actors; identifying a sequence of cluster matches; and correlating the sequence of cluster matches to known events; and further comprising; determining if a cluster needs to be split when new bad actors are added; and splitting the cluster into two clusters using a goodness of fit algorithm. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. A system for identifying events in a process, the system comprising:
-
means for running a principal component analysis model on sensor data from the process; means for calculating statistics related to the model; means for determining if an event is occurring; means for finding a nearest cluster of bad actors related to the event to identify the event; means for differentiating a sensor that directly senses the event from a sensor that senses a residual of the event; means for storing the found nearest cluster of bad actors in a storage device; and further comprising; means for identifying a sequence of cluster matches; and means for correlating the sequence of cluster matches to known events; and further comprising; means for determining if a cluster needs to be split when new bad actor(s) are added; and means for splitting the cluster into two clusters using a goodness of fit algorithm. - View Dependent Claims (9, 10, 11, 12, 13)
-
-
14. A computer implemented method of identifying events in a process, the method comprising:
-
running, in a computer processor, a principal component analysis model on sensor data representative of multiple process parameters in the process; calculating, using the computer processor, statistics related to the model; determining, using the computer processor, if an event is occurring in the process; and finding, using the computer processor, a nearest cluster of bad actors related to the event to identify the event, wherein an event consists of one or more process parameters being out of a normal range in one or more parts of the process; differentiating, using the computer processor, a sensor that directly senses the event from a sensor that senses a residual of the event; storing the found nearest cluster of bad actors in a computer storage device; and further comprising for new bad actors; identifying a sequence of cluster matches; and correlating the sequence of cluster matches to known events; and further comprising; determining if a cluster needs to be split when new bad actors are added; and splitting the cluster into two clusters using a goodness of fit algorithm. - View Dependent Claims (15, 16)
-
Specification