Leakage determination method, leakage determination system, and program

1. A leakage determination method using a computer comprising:

comparing

at least one first correlation profile, the first correlation profile including a first cross-correlation function obtained from measurement data measured at at least a pair of measurement positions, the measurement data being measured by generating a simulated leakage sound at a predetermined position, information about the simulated leakage sound and position information for the measurement positions, and

a second correlation profile at the time of the leakage determination including a second cross-correlation function obtained from measurement data measured at the pair of measurement positions and the position information for the measurement positions;

specifying the first correlation profile including the first cross-correlation function similar to a peak position of the second cross-correlation function included in the second correlation profile; and

determining a leakage position based on the first cross-correlation function included in the specified first correlation profile and the second cross-correlation function included in the second correlation profile.

2. The leakage determination method according to claim 1 , wherein

the first correlation profile includes a first environmental information obtained at measurement and the second correlation profile includes a second environmental information obtained at measurement;

the leakage determination method comprises

specifying the first correlation profile, including the first cross-correlation function similar to a peak position of the second cross-correlation function and including the first environmental information similar to the second environmental information included in the second correlation, and

determining a leakage position based on the first cross-correlation function included in the specified first correlation profile and the second cross-correlation function included in the second correlation profile.

3. The leakage determination method according to claim 2 , wherein

the first and second environmental information include at least any one of year, month, and day of measurement, measurement time, a day of a week, weather information, sound information, and leakage information.

4. The leakage determination method according to claim 1 , wherein the determining leakage comprising:

comparing the first correlation profile including information about the simulated leakage sound and a third correlation profile at the time of the leakage determination including information about the simulated leakage sound, and

determining a leakage position based on the first cross-correlation function of the first correlation profile similar to a peak position of a third cross-correlation function of the third correlation profile.

5. The leakage determination method according to claim 1 , wherein the determining leakage comprising:

comparing the first correlation profile including information about the simulated leakage sound and the second correlation profile at the time of the leakage determination not including information about the simulated leakage sound, and

determining a leakage amount based on based on a height of a peak of the second cross-correlation function of the second correlation profile and a height of a peak of the first cross-correlation function of the first correlation profile.

6. The leakage determination method according to claim 1 , wherein a vibration propagation speed database is prepared in which a configuration of a pipe and a vibration propagation speed in each pipe section based on measurement data in which a simulated leakage sound is generated and measured are recorded, and

wherein the determining leakage comprising determining a leakage position based on the vibration propagation speed database, the first correlation profile, and the second correlation profile.

7. A leakage determination system comprising:

a correlation profile database in which at least one first correlation profile, the first correlation profile including a cross-correlation function obtained from measurement data measured at at least a pair of measurement positions, the measurement data being measured by generating a simulated leakage sound at a predetermined position, information about the simulated leakage sound and position information for the measurement positions, is stored, and

a processor programmed to:

acquire a second correlation profile at the time of the leakage determination including a second cross-correlation function obtained from the measurement data measured at the pair of measurement positions and the position information for the measurement positions; and

specify the first correlation profile including the first cross-correlation function similar to a peak position of the second cross-correlation function included in the second correlation profile; and

determine a leakage position based on the first cross-correlation function included in the specified first correlation profile and the second cross-correlation function included in the acquired second correlation profile.

8. The leakage determination system according to claim 7 , wherein

the first correlation profile includes a first environmental information obtained at upon measurement and the second correlation profile includes a second environmental information obtained at measurement;

the processor programmed to

specify the first correlation profile, including the first cross-correlation function similar to a peak position of the second cross-correlation function and including the first environmental information similar to the second environmental information included in the second correlation, and

determine a leakage position based on the first cross-correlation function included in the specified first correlation profile and the second cross-correlation function included in the acquired second correlation profile.

9. The leakage determination system according to claim 8 , wherein

the first and second environmental information include at least any one of year, month, and day of measurement, measurement time, a day of a week, weather information, sound information, and leakage information.

10. The leakage determination system according to claim 7 , wherein the processor further programmed to

acquire a third correlation profile at the time of the leakage determination including a third cross-correlation function obtained from the measurement data measured at the pair of measurement positions, the measurement data being measured by generating a simulated leakage sound at a predetermined position, information about the simulated leakage sound and the position information for the measurement positions;

compare the third correlation profile and the third correlation profile; and

determine a leakage position by the first cross-correlation function of the first correlation profile similar to a peak position of the third cross-correlation function of the third correlation profile.

11. The leakage determination system according to claim 10 , further comprising a vibration propagation speed database in which a configuration of a pipe and a vibration propagation speed in each pipe section based on measurement data in which a simulated leakage sound is generated and measured are recorded,

wherein the processor further programmed to determine leakage based on the vibration propagation speed database, the first correlation profile, and the third correlation profile.

12. The leakage determination system according to claim 7 , wherein the processor further programmed to:

compare the first correlation profile and the second correlation profile, and

estimate a leakage amount based on a height of a peak of the second cross-correlation function of the second correlation profile and a height of a peak of the first cross-correlation function of the second correlation profile.

13. A non-transitory computer readable storage medium storing a program for causing a computer to perform a procedure comprising:

comparing

at least one first correlation profile, the first correlation profile including a first cross-correlation function obtained from measurement data measured at at least a pair of measurement positions, the measurement data being measured by generating a simulated leakage sound at a predetermined position, information about the simulated leakage sound and position information for the measurement positions, and

a second correlation profile at the time of the leakage determination including a second cross-correlation function obtained from the measurement data measured at the pair of measurement positions, and the position information for the measurement positions;

specifying the first correlation profile including the first cross-correlation function similar to a peak position of the second cross-correlation function included in the second correlation profile; and

determining a leakage position based on the first cross-correlation function included in the specified first correlation profile and the second cross-correlation function included in the second correlation profile.