Method for identifying unmeasured disturbances in process control test data
First Claim
1. A method of improving a data set associated with a system, the method comprising:
- providing a baseline data set for the system, wherein the baseline data set comprises a plurality of input and output data from the system;
analyzing the baseline data set and selecting a baseline model for the baseline data set, wherein the baseline model comprises an baseline array of data relating to the input and output data from the system;
normalizing the baseline data set associated with the system to create a normalized data set;
analyzing the normalized data set and selecting an improved model for the normalized data set, wherein the improved model comprises an improved array of data relating to the input and output data from the system;
performing a statistical comparison using the baseline data set and the normalized data set;
calculating an at least one indicator value associated with the normalized and baseline data set based on the statistical comparison;
determining a threshold value associated with the baseline data set and normalized data set based on the statistical comparison; and
producing a new data set by eliminating any segments of the baseline data set where the at least one indicator value is greater than the threshold value.
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Accused Products
Abstract
A method of improving a data set associated with a system, the method comprising: providing a baseline data set for the system, wherein the baseline data set comprises a plurality of input and output data from the system; analyzing the baseline data set and selecting a baseline model for the baseline data set, wherein the baseline model comprises an baseline array of data relating to the input and output data from the system; normalizing the baseline data set associated with the system to create a normalized data set; analyzing the normalized data set and selecting an improved model for the normalized data set, wherein the improved model comprises an improved array of data relating to the input and output data from the system; performing a statistical comparison using the baseline data set and the normalized data set; calculating an at least one indicator value associated with the normalized and baseline data set based on the statistical comparison; determining a threshold value associated with the baseline data set and normalized data set based on the statistical comparison; and producing a new data set by eliminating any segments of the baseline data set where the at least one indicator value is greater than the threshold value.
20 Citations
25 Claims
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1. A method of improving a data set associated with a system, the method comprising:
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providing a baseline data set for the system, wherein the baseline data set comprises a plurality of input and output data from the system; analyzing the baseline data set and selecting a baseline model for the baseline data set, wherein the baseline model comprises an baseline array of data relating to the input and output data from the system; normalizing the baseline data set associated with the system to create a normalized data set; analyzing the normalized data set and selecting an improved model for the normalized data set, wherein the improved model comprises an improved array of data relating to the input and output data from the system; performing a statistical comparison using the baseline data set and the normalized data set; calculating an at least one indicator value associated with the normalized and baseline data set based on the statistical comparison; determining a threshold value associated with the baseline data set and normalized data set based on the statistical comparison; and producing a new data set by eliminating any segments of the baseline data set where the at least one indicator value is greater than the threshold value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A system for identifying unmeasured disturbances in a process comprising:
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a data entry unit, wherein the data entry unit accepts a baseline data set associated with the process, selects a baseline model for the baseline data set, normalizes the baseline data set and creates an improved data set from the normalized baseline data set, and selects an improved model for the improved data set; a modeling unit, wherein the modeling unit calculates a statistical threshold value using the baseline data set and the improved data set calculates an indicator value using the baseline data set and the improved data set, and produces a new data set by eliminating any data in the baseline data set in which the indicator value is greater than the statistical threshold value; and a data output unit, wherein the data output unit outputs the new data set to a computer readable medium.
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18. A process control device capable of implementing model predictive control of a process, the process control device performing a method comprising:
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identifying a first model predictive control model using a training data set associated with the process; identifying a second model predictive control model using a linearized training data set; statistically comparing the results of the first model predictive control model and the second model predictive control model; detecting differences in the statistical comparison of the first model predictive control model and the second model predictive control model; producing a new data set by eliminating any data in the training data set based upon the differences in the first model predictive control model and the second model predictive control model. - View Dependent Claims (19, 20, 21)
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22. A method of identifying unmeasured disturbances in model predictive control test data comprising:
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identifying a first model predictive control model using a training data set; identifying a second model predictive control model using an improved training data set; calculating a global chi-squared value using the first model predictive control model, the second model predictive control model, the training data set, and the improved training data set; calculating an improved chi-squared threshold value; and producing a new data set by eliminating any data in the training data set in which the global chi-squared value is greater than the improved chi-squared threshold value. - View Dependent Claims (23, 24, 25)
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Specification