Nec Corporation

Soichiro Takata

Katsumi Kikuchi

Yasuhiro Sasaki

Jun Sakai

Shigeki Shinoda

Shin Tominaga

Masatake Takahashi

Shigeru Kasai

Nobuhiro Mikami

Hirofumi Inoue

Manabu Kusumoto

Shohei Kinoshita

Takahiro Kumura

Junichiro Mataga

Kanta Miyake

A piping diagnostic device according to an exemplary aspect of the present invention includes: criteria distribution generating means for generating a criteria distribution that is statistical data of criteria data of piping based on construction information about the piping, design information about the piping, and material information about the piping; changed-state distribution generating means for generating a changed-state distribution that is statistical data of changed-state data of the piping that have changed due to aging based on at least either vibration or dynamic pressure of the piping that have changed due to aging; measurement means for measuring at least either vibration or dynamic pressure of the piping; and determining means for determining deterioration of the piping based on the criteria distribution, the changed-state distribution, and at least either vibration or dynamic pressure of the piping.

Piping diagnostic device, piping diagnostic method, discriminant-problem optimizing device, discriminant-problem optimizing method, criteria distribution generating device, criteria distribution generating method, and storage medium

A first time difference calculation unit calculates a time difference &#x394;tbetween the timing of detection of vibration that indicates the first vibration mode of a pipe P and the timing of detection of vibration that indicates a second vibration mode of the pipe P by processing a result of a measurement . A second time difference calculation unit calculates a time difference &#x394;tbetween the timing of detection of vibration that indicates the first vibration mode of the pipe P and the timing of detection of vibration that indicates the second vibration mode of the pipe P by processing a result of another measurement. A leakage position calculation unit uses the time differences &#x394;t, &#x394;t, and a space interval I between the first vibration detection unit and the first time difference calculation unit to calculate a leakage position in the pipe P.

Leakage position calculation device, leakage position calculation method, computer-readable recording medium, vibration calculation device, and computation device

In a related fluid leakage detecting device, erroneous leakage determination may occur due to a change in a state of a fluid in piping. A leakage determination system of the present invention includes a first detection means for detecting a prescribed physical quantity indicating a state of a fluid in piping, a second detection means for detecting vibration propagating through the piping, and a leakage determination means for performing leakage determination based on the physical quantity detected by the first detection means and the vibration detected by the second detection means.

Leakage determination system and leakage determination method

Each functional configuring unit of a leak inspection device () operates in the manner that follows. A vibration acquisition unit () acquires a signal indicating tubing vibrations or vibrations propagated from tubing. A filtering unit () extracts a signal of a predetermined frequency band from the signal acquired by the vibration acquisition unit (). A characteristic value extraction unit () splits the signal extracted by the filtering unit () into predetermined time intervals, calculates for each split signal the absolute value of each extreme value of the magnitude of the signal, performs for each split signal a statistical process with respect to the calculated plurality of absolute values, and considers values calculated by the statistical process to be characteristic values. A leak determination unit () considers inspection results to indicate the presence of a leak when a determination index value stipulated using the characteristic values is greater than a predetermined threshold.

Leak inspection device, leak inspection method, and leak inspection program

A failure prediction system for performing failure prediction to a monitoring target device by detecting a state, comprising: a state detection unit for detecting state signals of no smaller than two different kinds, and outputting a detection signal corresponding to each of the state signals; a phase processing part for synchronizing a plurality of the detection signals; a signal analysis part for calculating a feature value indicating a feature of the state for each of the detection signals from the phase processing part; and a failure prediction part for performing failure prediction of the monitoring target device for each of the feature values by comparing the feature value in question and a reference value set in advance.

Failure prediction method and failure prediction system

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Tokyo, Japan

Soichiro Takata