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公开(公告)号：US11591925B2
公开(公告)日：2023-02-28
申请号：US16301549
申请日：2017-05-31
发明人： Ichiro Nagano , Kuniaki Aoyama , Mayumi Saito , Shintaro Kumano , Katsuhiko Abe , Toru Tanaka , Takahiro Yamauchi
摘要： An acquisition unit is configured to acquire measurement values of a target device. The measurement values that are acquired include at least a temperature and a flow rate of an input fluid to be input to the target device, and a temperature and a flow rate of an output fluid to be output from the target device. A correction unit is configured to obtain a correction measurement value by which the measurement values are corrected through thermal equilibrium calculations based on the measurement values. A distance calculation unit is configured to calculate a Mahalanobis distance with a factor of the correction measurement value.
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公开(公告)号：US11442443B2
公开(公告)日：2022-09-13
申请号：US16099577
申请日：2017-05-31
发明人： Ichiro Nagano , Kuniaki Aoyama , Mayumi Saito , Shintaro Kumano , Katsuhiko Abe , Toru Tanaka , Takahiro Yamauchi
摘要： An acquisition unit is configured to acquire measurement values of a target device. A likelihood calculation unit is configured to calculate an occurrence likelihood for each of a plurality of phenomena that are liable to occur to the target device based on the measurement values acquired by the acquisition unit. A table storage unit is configured to store a table in which the plurality of phenomena and occurrence causes of abnormalities of the target device are associated to each other. As estimation unit is configured to estimate the occurrence causes based on the occurrence likelihood and the table.
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公开(公告)号：US11327470B2
公开(公告)日：2022-05-10
申请号：US16769738
申请日：2018-12-18
发明人： Ichiro Nagano , Mayumi Saito , Keiji Eguchi
IPC分类号： G05B19/418
摘要： A unit space generating device (141) which generates a unit space for use when diagnosing an operating state of a plant on the basis of a Mahalanobis distance is provided with: a sampling data acquiring unit (141A) which acquires a sampling data group comprising a plurality of state quantities of the plant, measured with a fixed period; an adoption determining unit (141C) which, on the basis of an adoption probability calculated each time the sampling data group is acquired, determines whether the sampling data group is to be adopted as a unit space generation data group serving as the basis for a unit space; a unit space generating unit (141D) which generates unit spaces on the basis of a plurality of the adopted unit space generation data groups; and an output value acquiring unit (141B) which acquires an output value of the plant corresponding to the sampling data group.
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