公开(公告)号：US20210190272A1

公开(公告)日：2021-06-24

申请号：US16078133

申请日：2017-02-16

Applicant: NEC Corporation

Inventor： Soichiro TAKATA ,  Takahiro KUMURA ,  Kanta MIYAKE ,  Shin TOMINAGA ,  Hirofumi INOUE ,  Shigeki SHINODA

IPC: F17D5/06 ,  G01M3/24 ,  G01M3/28

Abstract: 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.

公开(公告)号：US20180136173A1

公开(公告)日：2018-05-17

申请号：US15573217

申请日：2016-05-20

Applicant: NEC CORPORATION

Inventor： Masatake TAKAHASHI ,  Shin TOMINAGA ,  Kanta MIYAKE

IPC: G01N29/42 ,  G01N29/04

CPC classification number: G01N29/42 ,  G01N29/04 ,  G01N29/043 ,  G01N29/07 ,  G01N29/46 ,  G01N2291/011 ,  G01N2291/0258 ,  G01N2291/262 ,  G01N2291/2634

Abstract: [Problem] To assess condition of a pipe with a high degree of accuracy.[Solution] A condition assessment device 100 includes a detection unit 110 that detects a plurality of waves propagating through a pipe or fluid in the pipe and each having a different propagation distance at the pipe or a connection portion of the pipe, a determination unit 120 that determines a predetermined frequency band based on a difference between the plurality of the waves detected by the detection means; and an assessment unit 130 that assesses condition of the pipe using a physical quantity related to the frequency band determined by the determination means as an index.

公开(公告)号：US20180045687A1

公开(公告)日：2018-02-15

申请号：US15557535

申请日：2016-03-22

Applicant: NEC Corporation

Inventor： Shin TOMINAGA ,  Masatake TAKAHASHI ,  Kanta MIYAKE

IPC: G01N29/34 ,  G01M3/02

CPC classification number: G01N29/348 ,  E03B7/071 ,  F17D5/06 ,  G01M3/02 ,  G01M3/243 ,  G01N29/043 ,  G01N29/12 ,  G01N29/14 ,  G01N29/42 ,  G01N2291/262

Abstract: To highly accurately determine whether there is a defect in a pipe.A defect analysis device includes frequency determining means for determining a first frequency band based on a first vibration occurred at a first point located within a predetermined range from a deployment position of vibration detection means capable of detecting a vibration occurred at a pipe, determining a second frequency band based on a second vibration occurred at a second point located which is different from the first point, and determining a leakage frequency band based on the first frequency band and the second frequency band, and signal processing means for determining a defect between the first point and the second point based on a vibration level of the vibration in the leakage frequency band.