Subband domain signal validation
First Claim
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1. A method for early detection of a deviation from a selected condition in a monitored system comprising the steps of:
- measuring a signal from the system containing information about operation of the system;
applying a plurality of filters to the signal for decomposing said signal into a plurality of sub-band components;
determining at least one feature value for at least one of said sub-band components;
generating an empirically-based estimate of said at least one feature value; and
comparing said estimate and said determined at least one feature value to detect a deviation from the selected condition.
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Abstract
A system, method and program product for predictive condition monitoring of a monitored system by means of sub-band decomposition of a complex monitored signal. Features of the decomposed signal are extracted for modeling estimation and detection of deviations in the features. Deviations are indicative of impending monitored system fault.
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Citations
20 Claims
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1. A method for early detection of a deviation from a selected condition in a monitored system comprising the steps of:
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measuring a signal from the system containing information about operation of the system; applying a plurality of filters to the signal for decomposing said signal into a plurality of sub-band components; determining at least one feature value for at least one of said sub-band components; generating an empirically-based estimate of said at least one feature value; and comparing said estimate and said determined at least one feature value to detect a deviation from the selected condition. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An apparatus for monitoring a system for early detection of faults, comprising:
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signal filter decomposition means disposed to decompose into a plurality of sub-band components a received signal indicative of operation of the system; feature extraction means for determining at least one feature value for at least one of said plurality of sub-band components; estimation means for generating an empirically-based estimate of said at least one feature value; and alerting means disposed to compare said estimate and said determined feature value and generate an alert in response to a deviation between said estimate and said determined feature. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A method for detection of a deviation from a selected operating condition of a monitored system, comprising the steps of:
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measuring a signal from the monitored system with said signal containing information about operation of the monitored system; creating a greater number of signal values from the signal in the form of a plurality of sub-band components; determining at least one feature value for at least one of said sub-band components which are characteristic of the greater number of signal values; generating an empirically-based estimate of said at least one feature value; and comparing said empirically-based estimate and said at least one feature value to detect a deviation from the selected operating condition of the monitored system. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification