Adaptive modeling of changed states in predictive condition monitoring
DCFirst Claim
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1. A method for adapting an empirical model used in monitoring a system, comprising the steps of:
- receiving actual values of monitored parameters characterizing the system;
generating from the empirical model estimates of the parameter values in response to receiving actual values;
calculating a global similarity score for a comparison of a set of estimated parameter values and a related set of actual parameter values; and
adapting the empirical model to account for at least some received actual values based on the global similarity score.
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Abstract
An improved empirical model-based surveillance or control system for monitoring or controlling a process or machine provides adaptation of the empirical model in response to new operational states that are deemed normal or non-exceptional for the process or machine. An adaptation decision module differentiates process or sensor upset requiring alerts from new operational states not yet modeled. A retraining module updates the empirical model to incorporate the new states, and a pruning technique optionally maintains the empirical model by removing older states in favor of the added new states recognized by the model.
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37 Claims
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1. A method for adapting an empirical model used in monitoring a system, comprising the steps of:
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receiving actual values of monitored parameters characterizing the system; generating from the empirical model estimates of the parameter values in response to receiving actual values; calculating a global similarity score for a comparison of a set of estimated parameter values and a related set of actual parameter values; and adapting the empirical model to account for at least some received actual values based on the global similarity score. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method for adapting a reference data set of an empirical model used in empirically modeling a system, comprising the steps of:
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receiving actual values of monitored parameters characterizing the system, including at least one control parameter; determining that the actual value for the at least one control parameter lies outside a predetermined range; adapting the empirical model in response to said determining step, to account for the received actual values. - View Dependent Claims (16)
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17. An apparatus for monitoring an operation of a system characterized by operational parameters, comprising:
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an empirical model for generating estimates of parameter values in response to receiving actual parameter values characterizing the operation of the system; a global similarity engine for generating a global similarity score for a comparison of a set of estimated parameter values and a related set of actual parameter values from said system; and an adaptation module for adapting the empirical model to account for at least some received actual parameter values based on the global similarity score. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. A computer program product, said computer program product comprising a computer usable medium having computer readable program code thereon for causing a computer processor to execute a series of instructions, for monitoring an operation of a system characterized by operational parameters, comprising:
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computer readable program code means for receiving actual parameter values characterizing operation of the system, including at least one control parameter; computer readable program code means for determining that an actual value for the at least one control parameter lies outside a predetermined range; computer readable program code means for storing data representing an empirical model of the system in a data storage means; and computer readable program code means for adapting the stored empirical model data in response to said determining step, to account for the received actual values. - View Dependent Claims (33, 34, 35)
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36. An apparatus for monitoring a condition of a system selected from the set of a machine and a process, using monitored sensor information from said system, comprising:
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a memory means for storing an empirical model of sensor information characterizing said system; a computer processing unit disposed to receive actual values of the monitored sensor information characterizing said system, including at least one control parameter, and generate estimates of at least some of the monitored sensor information for evaluating the condition of said system; and an adaptation program module executable in said computer processing unit for adapting the empirical model to account for at least some received actual values upon determining that the received actual value for the at least one control parameter lies outside a predetermined range. - View Dependent Claims (37)
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Specification