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

Patent metadata

Field	Value
Publication number	US-2016290886-A1
Application number	US-201415034909-A
Country	US
Kind code	A1
Filing date	Oct 20, 2014
Priority date	Nov 8, 2013
Publication date	Oct 6, 2016
Grant date	—

Abstract

The present invention reduces production costs associated with a device that uses results of detection by a plurality of vibration detectors to detect a leakage position in a pipe.
A first time difference calculation unit 114 calculates a time difference Δt1 between 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 made by a first vibration detection unit 112. A second time difference calculation unit 124 calculates a time difference Δt2 between 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 a measurement made by a second vibration detection unit 122. A leakage position calculation unit 130 uses the time differences Δt1, Δt2, and a space interval I between the first vibration detection unit 112 and the first time difference calculation unit 114 to calculate a leakage position in the pipe P.

First claim

What is claimed is:

1 .- 11 . (canceled)

12 . A system comprising:
a processor configured to calculate a time difference Δt between detection timing of vibration indicating a first vibration component in a pipe and detection timing of vibration indicating a second vibration component in the pipe by processing a measurement result by a vibration detector attached to the pipe.

13 . The system according to claim 12 , wherein the processor further configured to:
receive a time difference Δt1 between detection timing of vibration indicating a first vibration component in a pipe and detection timing of vibration indicating a second vibration component in the pipe, the time difference Δt1 being calculated based on a measurement result by the first vibration detector; receive a time difference Δt2 between detection timing of vibration indicating the first vibration component in the pipe and detection timing of vibration indicating the second vibration component in the pipe, the time difference Δt2 being calculated based on a measurement result by a second vibration detector attached to the pipe separately from the first vibration detector in an extending direction of the pipe; and calculate a leakage position in the pipe by using the time difference Δt1, the time difference Δt2, and a space interval I between the first vibration detector and the second vibration detector.

14 . The system according to claim 12 , the system further comprising:
a first vibration detector and a second vibration detector attached to the pipe separately in an extending direction of the pipe; and wherein the processor further configured to: calculate a time difference Δt1 between detection timing of vibration indicating a first vibration component in the pipe and detection timing of vibration that indicates a second vibration component in the pipe by processing a measurement result by the first vibration detector; calculate a time difference Δt2 between detection timing of vibration indicating the first vibration component in the pipe and detection timing of vibration indicating the second vibration component in the pipe by processing a measurement result by the second vibration detector; and calculate a leakage position in the pipe by using the time difference Δt1, the time difference Δt2, and a space interval I between the first vibration detector and the second vibration detector.

15 . The system according to claim 14 ,
wherein the first vibration component is an m-th order resonance mode of the pipe (m is a positive number) and the second vibration component is an n-th order resonance mode of the pipe (n>m).

16 . The system according to claim 15 ,
wherein the processor further configured to extract vibration in the m-th order resonance mode and extracting vibration in the n-th order resonance mode during each of the calculation of At1 and Δt2.

17 . The system according to claim 12 ,
wherein the first vibration component is a longitudinal vibration mode and the second vibration component is a bending vibration mode.

18 . The system according to claim 13 ,
wherein the processor further configured to calculate a distance L from the first vibration detector to the leakage position in accordance with the following Equation (1) during the calculation of the leakage position:

[

Math
.


1

]

L
=

l

1
+

Δ




t
2

Δ




t
1

(
1
)

19 . The system according to claim 13 ,
wherein the processor does not configured to synchronize the first vibration detector and the second vibration detector.

20 . The system according to claim 12 , further comprising:
a vibration detector attached to the pipe.

21 . A leakage position calculation method comprising:
calculating a time difference Δt between detection timing of vibration indicating a first vibration component in the pipe and detection timing of vibration indicating a second vibration component in the pipe by processing a measurement result by vibration detector attached to a pipe.

22 . A non-transitory computer-readable recording medium storing a program causing a computer to function of:
calculating a time difference Δt between detection timing of vibration indicating a first vibration component in the pipe and detection timing of vibration indicating a second vibration component in the pipe by processing a measurement result by vibration detector attached to a pipe.

Assignees

• Nec Corp

Inventors

• Takata Soichiro
• Kasai Shigeru

Classifications

• G01M7/025

  Measuring arrangements · CPC title

• G01M3/00 Primary

  Investigating fluid-tightness of structures · CPC title

• G01M3/243 Primary

  for pipes · CPC title

• G01M3/18

  for pipes, cables or tubes; for pipe joints or seals; for valves; {for welds; for containers, e.g. radiators} · CPC title

• G01M3/184

  for valves · CPC title