Anomaly factor estimation method, anomaly factor estimating device, and program
AssigneeMitsubishi Heavy Industries, Ltd.
InventorsMasato SHIDA, Takashi SONODA, Shintaro KUMANO
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Abstract
An anomaly factor estimation method includes the steps of: calculating, based on a factor table indicating an occurrence frequency of each of factors for each of events, a prior probability that is a probability for each factor to occur; calculating a posterior probability that is a probability for a certain event to be caused by a certain factor; and multiplying the posterior probability by a weighting coefficient relating to a signal-to-noise ratio gain value of a sensor measurement value, and calculating an index indicating an occurrence probability for each combination of the factors and the events.
Claims10
An anomaly factor estimation method, comprising the steps of:
- calculating, based on a factor table indicating an individual occurrence frequency of a plurality of factors for a plurality of events, a prior probability that is a probability for each of the plurality of factors to occur;
- calculating a posterior probability that is a probability for a certain event to be caused by a certain factor of the plurality of factors;
- and
- multiplying the posterior probability by a weighting coefficient relating to a signal-to-noise ratio gain value of a sensor measurement value, and calculating an index indicating an occurrence probability for individual combination of the plurality of factors and the plurality of events.
An anomaly factor estimating device, comprising:
- a prior probability calculating unit configured to calculate, based on a factor table indicating an individual occurrence frequency of a plurality of factors for a plurality of events, a prior probability that is a probability for each of the plurality of factors to occur;
- a posterior probability calculating unit configured to calculate a posterior probability that is a probability for a certain event among the plurality of events to be caused by a certain factor among the plurality of factors;
- and
- an index calculating unit configured to multiply the posterior probability by a weighting coefficient relating to a signal-to-noise ratio gain value of a sensor measurement value, and calculate an index indicating an occurrence probability for individual combination of the plurality of factors and the plurality of events.
A non-transitory computer readable storage medium storing a program for causing a computer to execute the procedures of:
- calculating, based on a factor table indicating an individual occurrence frequency of a plurality of factors for a plurality of events, a prior probability that is a probability for each of the plurality of factors to occur;
- calculating a posterior probability that is a probability for a certain event among the plurality of events to be caused by a certain factor among the plurality of factors;
- and
- multiplying the posterior probability by a weighting coefficient relating to a signal-to-noise ratio gain value of a sensor measurement value, and calculating an index indicating an occurrence probability for individual combination of the plurality of factors and the plurality of events.
Dependencies are inferred from the claim text.