Systems and methods for diagnosing the cause of trend shifts in performance data
First Claim
1. An automated method for diagnosing the cause of a trend shift in performance data associated with a system, the method comprising:
- selecting a fuzzy model describing how the mean associated with a parameter shifts when a predetermined problem occurs;
receiving performance data associated with the system;
applying a preferred set of piecewise regressions;
selecting a start date;
selecting data sets near the start date and an end date that have a predetermined size without violating normal scatter;
measuring the mean shift between a plurality of samples using one or more statistical tests; and
combining the results with the fuzzy model to achieve a diagnosis.
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Abstract
Automated systems and methods for diagnosing the cause of a trend shift in performance data associated with a system including selecting a fuzzy model describing how the mean associated with a parameter shifts when a predetermined problem occurs and receiving performance data associated with the system. The diagnostic systems and methods also including applying a preferred set of piecewise regressions. The diagnostic systems and methods further including selecting a start date and selecting data sets near the start date and an end date that have a relatively large size without violating normal scatter. The diagnostic systems and methods still further including measuring the mean shift between a plurality of samples using one or more statistical tests and combining the results with the fuzzy model to achieve a diagnosis.
38 Citations
40 Claims
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1. An automated method for diagnosing the cause of a trend shift in performance data associated with a system, the method comprising:
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selecting a fuzzy model describing how the mean associated with a parameter shifts when a predetermined problem occurs; receiving performance data associated with the system; applying a preferred set of piecewise regressions; selecting a start date; selecting data sets near the start date and an end date that have a predetermined size without violating normal scatter; measuring the mean shift between a plurality of samples using one or more statistical tests; and combining the results with the fuzzy model to achieve a diagnosis. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An automated method for diagnosing the cause of a trend shift in performance data associated with an aircraft engine system, the method comprising:
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selecting a fuzzy model describing how the mean associated with a parameter shifts when a predetermined problem occurs; achieving a diagnosis using the fuzzy model; providing a plurality of validation cases associated with the aircraft engine system; validating the fuzzy model using the plurality of validation cases; providing an evaluation function; and using the evaluation function to determine how well the fuzzy model differentiates the diagnosis from a plurality of incorrect diagnoses for the plurality of validation cases. - View Dependent Claims (16, 17, 18, 19, 20)
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21. An automated system for diagnosing the cause of a trend shift in performance data associated with a system, the diagnostic system comprising:
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a fuzzy model describing how the mean associated with a parameter shifts when a predetermined problem occurs; means for receiving performance data associated with the system; a first algorithm operable for applying a preferred set of piecewise regressions; a second algorithm operable for selecting a start date; a third algorithm operable for selecting data sets near the start date and an end date that have a predetermined size without violating normal scatter; a fourth algorithm operable for measuring the mean shift between a plurality of samples using one or more statistical tests; and means for combining the results with the fuzzy model to achieve a diagnosis. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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35. An automated system for diagnosing the cause of a trend shift in performance data associated with an aircraft engine system, the diagnostic system comprising:
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a fuzzy model describing how the mean associated with a parameter shifts when a predetermined problem occurs; means for achieving a diagnosis using the fuzzy model; means for receiving a plurality of validation cases associated with the aircraft engine system; means for validating the fuzzy model using the plurality of validation cases; and an evaluation function, wherein the evaluation function is used to determine how well the fuzzy model differentiates the diagnosis from a plurality of incorrect diagnoses for the plurality of validation cases. - View Dependent Claims (36, 37, 38, 39, 40)
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Specification