# US 10,119,880 B2 · Leakage position calculation device, leakage position calculation method, computer-readable recording medium, vibration calculation device, and computation device

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- Number: US 10,119,880 B2
- Document ID: US10119880B2
- Status: Granted
- Kind: B2
- Application number: 15/034,909
- Filed: 2014-10-20
- Published: 2016-10-06
- Granted: 2018-11-06
- Earliest claimed: 2013-11-08
- Assignees: NEC Corporation
- Applicants: NEC Corporation
- Inventors: Soichiro Takata; Shigeru Kasai
- Web page: https://patentgrep.com/patent/US10119880B2

## CPC

- G01M 3/00: Investigating fluid-tightness of structures
- G01M 3/243: {for pipes}
- G01M 7/025: {Measuring arrangements}
- G01M: TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR

## Abstract

A first time difference calculation unit 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 . A second time difference calculation unit 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 another measurement. A leakage position calculation unit uses the time differences Δt1, Δt2, 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.

## Claims

### Claim 1

A system comprising:
a processor configured to:
calculate a time difference Δt1 between detection timing of a peak of vibration indicating a first vibration component in a pipe and detection timing of a peak of vibration indicating a second vibration component in the pipe based on a measurement result by a first vibration detector attached to the pipe, the first vibration component and the second vibration component being vibration components different in vibration mode with each other and being obtained based on a measurement result by the first vibration detector;
calculate a time difference Δt2 between detection timing of a peak of vibration indicating the first vibration component in the pipe and detection timing of a peak of vibration indicating the second vibration component in the pipe 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, the first vibration component and the second vibration component being vibration components different in vibration mode with each other and being obtained based on 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.

### Claim 2 (depends on 1)

The system according to claim 1, 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.

### Claim 3 (depends on 1)

The system according to claim 1,
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).

### Claim 4 (depends on 1)

The system according to claim 1,
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 Δt1 and Δt2.

### Claim 5 (depends on 1)

The system according to claim 1,
wherein the first vibration component is a longitudinal vibration mode and the second vibration component is a bending vibration mode.

### Claim 6 (depends on 1)

The system according to claim 1,
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
)

### Claim 7 (depends on 1)

The system according to claim 1,
wherein the processor does not configured to synchronize the first vibration detector and the second vibration detector.

### Claim 8 (depends on 1)

The system according to claim 1, further comprising:
a vibration detector attached to the pipe.

### Claim 9

A leakage position calculation method comprising:
calculating a time difference Δt1 between detection timing of a peak of vibration indicating a first vibration component in a pipe and detection timing of a peak of vibration indicating a second vibration component in the pipe based on a measurement result by a first vibration detector attached to the pipe, the first vibration component and the second vibration component being vibration components different in vibration mode with each other and being obtained based on a measurement result by the first vibration detector;
calculating a time difference Δt2 between detection timing of a peak of vibration indicating the first vibration component in the pipe and detection timing of a peak of vibration indicating the second vibration component in the pipe 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, the first vibration component and the second vibration component being vibration components different in vibration mode with each other and being obtained based on a measurement result by the second vibration detector; and
calculating 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.

### Claim 10

A non-transitory computer-readable recording medium storing a program causing a computer to function of:
calculating a time difference Δt1 between detection timing of a peak of vibration indicating a first vibration component in a pipe and detection timing of a peak of vibration indicating a second vibration component in the pipe based on a measurement result by a first vibration detector attached to the pipe, the first vibration component and the second vibration component being vibration components different in vibration mode with each other and being obtained based on a measurement result by the first vibration detector;
calculating a time difference Δt2 between detection timing of a peak of vibration indicating the first vibration component in the pipe and detection timing of a peak of vibration indicating the second vibration component in the pipe 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, the first vibration component and the second vibration component being vibration components different in vibration mode with each other and being obtained based on a measurement result by the second vibration detector; and
calculating 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.