Error detection method and its system for early detection of errors in a planar or facilities
First Claim
1. An error detection method for early detection of errors in a plant or facilities, comprising of steps of:
- acquiring data from a plurality of sensors;
dividing a trace in a data space into a plurality of clusters over time on the basis of a temporal change of the data;
wherein a trace in a data space represents the sensor data acquired over a period of time;
wherein a data space represents attributes of sensor data;
wherein each cluster corresponds to an operation state of the plant or facilities;
for each operation state, modeling the corresponding divided clusters by a sub space method; and
calculating a discrepancy value based on the models of derived clusters as an error candidate.
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Abstract
Provided are a method which permits complete training data and data with added errors, and enables the early and accurate discovery of errors in facilities such as a plant, and a system thereof. To achieve the objectives, (1) the behavior of temporal data is observed over time, and the trace is divided into clusters; (2) the divided cluster groups are modeled in sub spaces, and the discrepancy values are calculated as errors candidates; (3) the training data are used (compare, reference, etc.) for reference to determine the state transitions caused by the changes over time, the environmental changes, the maintenance (parts replacement), and the operation states; and (4) the modeling is a sub space method such as regression analysis or projection distance method of every N data removing N data items, (N=0, 1, 2, . . . ) (for example, when N=1, one error data item is considered to have been added, this data is removed, then the modeling is performed), or a local sub space method. Linear fitting in regression analysis is equivalent to the lowest order regression analysis.
29 Citations
14 Claims
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1. An error detection method for early detection of errors in a plant or facilities, comprising of steps of:
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acquiring data from a plurality of sensors; dividing a trace in a data space into a plurality of clusters over time on the basis of a temporal change of the data; wherein a trace in a data space represents the sensor data acquired over a period of time; wherein a data space represents attributes of sensor data; wherein each cluster corresponds to an operation state of the plant or facilities; for each operation state, modeling the corresponding divided clusters by a sub space method; and calculating a discrepancy value based on the models of derived clusters as an error candidate. - View Dependent Claims (2, 3, 4, 5)
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6. An error detection method for early detection of errors in a plant or facilities, comprising of steps of:
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acquiring data from a plurality of sensors; dividing a trace in a data space into a plurality of clusters over time on the basis of a temporal change of the data; wherein a trace in a data space represents the sensor data acquired over a period of time; wherein a data space represents attributes of sensor data; wherein each cluster corresponds to an operation state of the plant or facilities; for each operation state, modeling the corresponding divided clusters by a sub space method; and displaying the data on a time-series signal to make the divided clusters evident to visualize a state. - View Dependent Claims (7)
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8. An error detection system for early detection of errors in a plant or facilities, comprising:
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a hardware processor; a data acquiring unit that acquires data from a plurality of sensors; a trace division unit that divides a trace in a data space into a plurality of clusters over time on the basis of a temporal change of the data acquired by the data acquiring unit; wherein a trace in a data space represents the sensor data acquired over a period of time; wherein a data space represents attributes of sensor data; wherein each cluster corresponds to an operation state of the plant or facilities; a modeling unit that performs modeling in a sub space on the divided clusters corresponding to each operation state which is divided by the trace division unit; and an error detection unit that calculates an discrepancy value as an error candidate based on the models of derived clusters which is modeled by the modeling unit. - View Dependent Claims (9, 10, 11, 12)
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13. An error detection system for early detection of errors in a plant or facilities, comprising:
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a hardware processor; a data acquiring unit that acquires data from a plurality of sensors; a trace division unit that divides a trace in a data space into a plurality of clusters over time on the basis of a temporal change of the data acquired by the data acquiring unit; wherein a trace in a data space represents the sensor data acquired over a period of time; wherein a data space represents attributes of sensor data; wherein each cluster corresponds to an operation state of the plant or facilities; a modeling unit that performs modeling in a sub space on the divided clusters corresponding to each operation state which is divided by the trace division unit; an error detection unit that calculates an discrepancy value as an error candidate based on the models of derived clusters which is modeled by the modeling unit; and a data display unit which displays the data on a time-series signal to make the divided clusters which is divided by the trace division unit evident to visualize a state. - View Dependent Claims (14)
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Specification