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公开(公告)号：US20210325005A1
公开(公告)日：2021-10-21
申请号：US17272394
申请日：2019-09-02
Applicant: NEC Corporation
Inventor： Hirofumi INOUE , Shigeki SHINODA , Junichiro MATAGA , Katsumi KIKUCHI
Abstract: A fluid leakage diagnosing device includes: when fluid leakage relating to a pipeline is being diagnosed by employing adaptive signal processing to suppress a component of a disturbance vibration contained in a vibration measured at a prescribed location in the pipeline, an acquiring unit that acquires distribution information that is associated with a characteristic of the pipeline and represents an actual distribution result of a value of a parameter in the adaptive signal processing when performance of suppressing the component of the disturbance vibration satisfies a criterion; an estimating unit that, based on the distribution information, estimates a probability density at which the value of the parameter with which the performance satisfies the criterion exists; and a determining unit that, based on the probability density estimated by the estimating unit, determines a range to search for the value of the parameter in the adaptive signal processing.
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公开(公告)号：US20210010980A1
公开(公告)日：2021-01-14
申请号：US16970754
申请日：2019-02-18
Applicant: NEC Corporation
Inventor： Soichiro TAKATA , Hirofumi INOUE , Shigeki SHINODA , Katsumi KIKUCHI
Abstract: A system identification device 1 includes an analysis unit 105 that calculates a self-frequency response function on the basis of an input signal and an output signal measured by a measurement unit 103 at a position where a subject physical system 106 has been excited by a vibrating unit 102. The analysis unit 105 performs system identification of the subject physical system 106 by using an impulse response function obtained from the calculated self-frequency response function and an impulse response function of a virtual two-degrees-of-freedom model modeling the subject physical system 106 that is the subject of analysis. This makes it possible to perform system identification of systems with close eigenvalues.
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公开(公告)号：US20190154637A1
公开(公告)日：2019-05-23
申请号：US16098158
申请日：2017-05-11
Applicant: NEC Corporation
Inventor： Manabu KUSUMOTO , Katsumi KIKUCHI , Takahiro KUMURA
Abstract: To acquire information relating to degradation of a pipe on the basis of information that can be acquired using a simple method. The analysis device according to one embodiment is provided with: a determining unit for determining whether or not the accuracy of a pipe network model based on information that includes a parameter that changes in value in accordance with degradation of a pipe satisfies a predetermined criterion; and a derivation unit for deriving information relating to degradation of the pipe, based on the parameter, if the accuracy satisfies the predetermined criterion.
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