JP6349861B2 - Leak detection device, leak detection system, leak detection method and program - Google Patents

Description

  The present invention relates to a leak detection device, a leak detection system, a leak detection method, and a program.

  Pipes such as water pipes and gas pipes are often buried underground or installed at high places in buildings. Therefore, fluid leakage inspection due to deterioration or destruction of piping is often difficult. On the other hand, when the presence of a leak becomes clear, it is necessary to keep the repair cost low, so it is required to specify the position with high accuracy.

  When fluid leaks from the piping, vibration from the leaked portion, that is, leakage vibration occurs. By detecting this leakage vibration, it is possible to specify the presence or absence of the leakage, and the position when there is a leakage. For this reason, development of a technique for identifying the leak position by detecting the vibration generated from the leak location has been performed.

  In the invention shown in Patent Document 1, a technique is disclosed in which a fluid leakage sound is detected by two or more sensors and a fluid leakage point is specified by cross-correlation function processing between detection signals. Patent Document 2 discloses a technique in which a plurality of vibration sensors are installed in a water supply pipe to a demand end, and a pipe or a region where water leakage has occurred is estimated from a comparison of vibration levels.

Japanese Patent Laid-Open No. 11-201858 JP 2005-331374 A

  The technique described in Patent Document 1 specifies a position from a difference in arrival time when water leaking sound reaches a plurality of sensors on a pipe, but a function that synchronizes the time with high accuracy between a plurality of detection devices. A device having a is generally expensive. Moreover, the technique described in Patent Document 2 requires a large number of sensors to be installed in order to identify the water leakage position. That is, in the technique described in the patent document, there is a problem that the configuration becomes complicated in order to specify the leakage position of the pipe.

  The present invention has been made to solve the above-described problems, and provides a leak detection device, a leak detection system, a leak detection method, and a program for specifying a leak position of a pipe with a simple configuration.

  The leak detection device of the present invention specifies a leak position of a pipe by an acquisition unit that acquires a first feature value related to the amplitude of vibration detected by a first detection unit, and a first technique based on the first feature value. And having a specific part.

  Moreover, the leak detection system of this invention has a 1st detection part which detects the vibration of piping, and the leak detection apparatus demonstrated above.

  Moreover, the leak detection method of the present invention includes a step of obtaining a first feature value related to the amplitude of vibration detected by the first detector, and a step of specifying a leak position of the pipe based on the first feature value. It is what has.

  In addition, the program of the present invention causes the computer to acquire a first feature value related to the amplitude of vibration detected by the first detection unit, and to specify a leak position of the pipe based on the first feature value. The process to perform is performed.

  According to the present invention, it is possible to provide a leak detection device, a leak detection system, a leak detection method, and a program that specify a leak position of a pipe with a simple configuration.

It is a block diagram which shows the structure of the leak detection apparatus 100 in the 1st Embodiment of this invention. It is a block diagram which shows the structure of the leak detection system 10 in the 1st Embodiment of this invention. It is a flowchart which shows operation | movement of the leak detection apparatus 100 in the 1st Embodiment of this invention. It is a block diagram which shows the structure of the leak detection apparatus 200 in the 2nd Embodiment of this invention. It is a block diagram which shows the structure of the leak detection system 20 in the 2nd Embodiment of this invention. It is a schematic diagram which shows the relationship between the magnitude | size of the vibration amplitude which the feature value in this invention shows, and the distance from a leak position. It is a schematic diagram which shows the determination method of the coefficient of the determination formula based on the measurement result by the specific | specification part 202 in the 2nd Embodiment of this invention. It is a block diagram which shows the structure of the specific part 302 of the leak detection apparatus 300 in the 3rd Embodiment of this invention. It is a block diagram which shows the structure of the leak detection system 30 in the 3rd Embodiment of this invention. It is a schematic diagram which shows the specification method of the leak position by the specific | specification part 302 in the 3rd Embodiment of this invention.

  Embodiments of the present invention will be specifically described with reference to the accompanying drawings.

In addition, the leak detection apparatus in this invention can show a predetermined point on piping as a leak position as a leak position, or can show that a leak position is contained in the predetermined range on pipe. In addition, the leak detection device according to the present invention is realized by any combination of hardware and software.
(First embodiment)
A first embodiment of the present invention will be described. FIG. 1 shows an example of a leak detection apparatus 100 according to the first embodiment of the present invention. FIG. 2 shows an example of a leak detection system 10 using the leak detection apparatus 100 according to the first embodiment of the present invention. FIG. 3 shows an example of a leak detection method realized by using the leak detection device 100 according to the first embodiment of the present invention.

  As shown in FIG. 1, the leak detection apparatus 100 according to the first embodiment of the present invention includes an acquisition unit 101 that acquires a first feature value related to the amplitude of vibration detected by the first detection unit 111, It has the specific part 102 which specifies the leak position 501 of the piping 500 by the 1st method based on a feature value.

  First, the operation of the leak detection apparatus 100 according to this embodiment will be described with reference to FIGS. 1 and 3. First, the acquisition unit 101 acquires a first feature value related to the amplitude of vibration of the pipe 500 detected by the first detection unit 111 (step S10). In this case, when the acquisition unit 101 acquires the first feature value, the specifying unit 102 refers to the first feature value acquired by the acquisition unit 101, and leaks based on the first feature value. The position 501 is specified (step S20).

  Subsequently, each configuration of the leak detection apparatus 100 according to the first embodiment of the present invention will be described.

  The acquisition unit 101 acquires a first feature value related to the amplitude of vibration detected by the first detection unit 111. The first characteristic value to be acquired includes a characteristic value related to the amplitude of vibration generated in the pipe 500 or the fluid flowing through the pipe 500. The acquisition unit 101 may acquire the first feature value at a predetermined interval, or may acquire the first feature value at an arbitrary time point based on an instruction from the outside.

  As an example of a feature value acquisition method, the acquisition unit 101 receives information on vibration detected by the first detection unit 111 and performs signal processing on the acquisition unit 101 to extract the first feature value. Can be acquired. As another example, the acquisition unit 101 can acquire the first feature value extracted by performing signal processing in the first detection unit 111 from the vibration acquired in the first detection unit 111. In any case, the acquisition unit 101 or the first detection unit 111 can use a known method such as a filter process as a signal processing method, and the required accuracy of specifying the leakage position 501 Signal processing techniques suitable for the power consumption and power consumption can be used. The acquisition unit 101 extracts and acquires a first feature value from vibration information measured by the first detection unit 111 during an arbitrary period. In this case, the acquisition unit 101 can extract and acquire the first feature value from vibration information measured by the first detection unit for about 1 second, for example.

  Further, as the first feature value, the acquisition unit 101 acquires the maximum value, effective value, or average value of the amplitude in the vibration information acquired by the first detection unit 111. The acquisition unit 101 can acquire a value related to vibration amplitude other than this as the first feature value, but preferably acquires an effective value. The acquisition unit 101 can acquire any one type of values as the first feature values by selecting any one type of values as the first feature values, and can acquire a plurality of types of values as the first feature values. You can also

  The specifying unit 102 specifies the leakage position 501 in the pipe 500 by the first method based on the first feature value acquired by the acquiring unit 101 from the first detecting unit 111. In the present embodiment, the specifying unit 102 may specify the distance from the point where the first detection unit 111 detects the vibration of the pipe 500 as the leakage position 501. That is, when the first detection unit 111 detects vibration of the pipe 500 at a point in the middle of the pipe 500 extending in a predetermined direction, the leak detection device 100 is located on both sides of the pipe 500 with respect to the point. There may be a case where the leakage position 501 is present at two points. Or the leak detection apparatus 100 may show that the leak position 501 exists in the predetermined range of two places in the both sides of piping with respect to the point. The leak detection apparatus 100 according to the present embodiment can indicate the leak position 501 as appropriate depending on the error of the first feature value used in the specifying unit 102, the detection accuracy required for specifying the leak position 501 and the like. .

  An example of a method for specifying the leakage position 501 in the specifying unit 102 will be described. As the first method, the specifying unit 102 specifies the leak position 501 using the magnitude of the vibration amplitude indicated by the first feature value and the relationship between the amplitude change according to the distance from the leak position 501 of the leak vibration. can do. In general, the amplitude of the leakage vibration changes according to the distance from the leakage position 501 and decreases, for example, according to the distance from the leakage position 501. Therefore, the specifying unit 102 can specify the leakage position 501 by associating the magnitude of the vibration amplitude indicated by the first feature value with the relationship between the distance from the leakage position 501 of the leakage vibration and the amplitude.

  In this example, the specifying unit 102 can hold the relationship with the change in the amplitude according to the distance from the leakage position 501 of the leakage vibration, for example, in the form of a judgment formula. Further, the specifying unit 102 can hold the relationship between the change in amplitude according to the distance from the leakage position 501 of the leakage vibration as a database in which the relationship between the distance and the amplitude is associated. Then, the specifying unit 102 uses, for example, a determination formula or a database, and the leakage is performed by associating the magnitude of the vibration amplitude indicated by the first feature value with the relationship between the distance from the leakage position 501 of the leakage vibration and the amplitude. Identify the location.

  Note that factors that affect the relationship between the distance from the leakage position 501 and the amplitude of the leakage vibration include, for example, the type of the pipe 500 that is a specific target of the leakage position 501, the surrounding geology where the pipe 500 is installed, and the like. The surrounding environment, the installation status of the first detection unit 111, and the like are included. Further, the type of the pipe 500 includes the diameter, thickness, or material of the pipe 500. The relationship between the distance from the leakage position 501 and the amplitude of the leakage vibration is obtained by calculating from the above factors, for example. Further, the relationship between the distance from the leakage position 501 and the amplitude of the leakage vibration is obtained by exciting the pipe 500 by an arbitrary method and measuring the relationship between the distance and the amplitude from the excited position. The specifying unit 102 can specify the leakage position 501 of the pipe 500 using the relationship between the distance from the leakage position 501 of the leakage vibration and the amplitude obtained as described above.

  Another example of a method for specifying the leakage position 501 in the specifying unit 102 will be described. As the first technique, the specifying unit 102 can specify the leakage position 501 based on the relationship between the first feature value and the vibration detection sensitivity of the first detection unit 111.

  The distance at which the first detection unit 111 can detect the leakage vibration can be obtained in advance based on the relationship between the detection sensitivity of the first detection unit 111 and the type of the pipe 500 for which the leakage position 501 is to be specified. it can. That is, when the type of the pipe 500 that is the detection target of the leakage position 501 is known in advance, the relationship between the distance at which the first detection unit 111 can detect leakage vibration and the detection sensitivity of the first detection unit 111 is Can be sought. Therefore, when the type of the pipe 500 that is the detection target of the leakage position 501 is known in advance, the specifying unit 102 detects the leakage position 501 based on the first characteristic value detected by the first detection unit 111 while changing the detection sensitivity. Can be specified.

  That is, the specifying unit 102 obtains the detection sensitivity of the first detection unit 111 when leakage vibration cannot be detected from the first feature value detected by changing the detection sensitivity of the first detection unit 111. The case where the leakage vibration cannot be detected can be, for example, a case where the magnitude of the vibration amplitude indicated by the first feature value is equal to or less than a predetermined threshold value. Then, the specifying unit 102 specifies the leak position 501 based on the relationship between the obtained detection sensitivity, the distance at which the first detection unit 111 can detect the leakage vibration, and the detection sensitivity of the first detection unit 111. can do.

  Note that the specifying unit 102 can also use the above-described method for specifying the leakage position 501 in combination with each other.

  As described above, the leak detection apparatus 100 according to the present embodiment acquires the first feature value related to the amplitude of vibration detected by the acquisition unit 101 by the first detection unit 111, and the specifying unit 102 sets the first feature value. Based on this, the leak position 501 can be specified. In specifying the leak position 501, the leak detection apparatus 100 according to the present embodiment does not require time synchronization or a large number of sensors as described above. Therefore, the leak detection apparatus 100 according to the present embodiment can specify the leak position 501 with a simple configuration without specifying a complicated configuration in order to specify the leak position 501 of the fluid from the pipe 500.

  In addition, the leak detection apparatus 100 in this embodiment can specify a leak position with arbitrary procedures or timing. For example, the leak detection device 100 according to the present embodiment can determine whether there is a leak by using any means, and can specify the leak position after confirming that there is a leak. By doing in this way, when the leak detection apparatus 100 has not leaked in the piping 500, it can suppress specification of an unnecessary leak position. Further, in this case, the leak detection apparatus 100 can operate to determine whether there is a leak and specify the leak position at a predetermined interval, and the interval is appropriately set to be about 50 times a day as an example. can do.

  FIG. 2 shows a configuration example of the leak detection system 10 in the first embodiment of the present invention. According to FIG. 2, the leak detection system 10 has a configuration including a first detection unit 111 that detects vibration of the pipe 500 and the leak detection device 100 according to the first embodiment of the present invention.

  In the leak detection system 10 illustrated in FIG. 2, for example, a vibration sensor or an acoustic sensor is used as the first detection unit 111. When using a vibration sensor, a piezoelectric vibration sensor can be used. The first detection unit 111 is attached to an arbitrary place where vibration of the pipe 500 can be detected. For example, it is attached to the surface of the pipe 500, the flange of the pipe 500, the surface of a fire hydrant connected to the pipe 500, or the like. Furthermore, the 1st detection part 111 is attached to the piping 500 etc. by arbitrary methods. For example, the first detection unit 111 is attached to the pipe 500 using a magnet or an adhesive.

In the leak detection system 10 shown in FIG. 2, the leak detection device 100 communicates with the first detection unit 111 by any communication means, for example, so that the acquisition unit 101 can acquire the first feature value. It can be configured. The communication means may be either wired or wireless. When wireless communication is used as the communication means, leak detection apparatus 100 may use a fixed base station or a moving base station as the communication means. When the leak detection apparatus 100 uses a moving base station as a communication means, the base station may be mounted on an automobile and circulate around the first detection unit 111 at an arbitrary period. Moreover, the leak detection apparatus 100 in the leak detection system 10 shown in FIG. 2 can be configured such that the acquisition unit 101 can always acquire the first feature value, or the first feature value is intermittently obtained. It can also be configured to be obtainable. However, the leak detection apparatus 100 is not limited to the communication unit, and the acquisition unit 101 may be configured to acquire the first feature value by other units such as an arbitrary recording medium.
(Second Embodiment)
Next, a second embodiment of the present invention will be described. FIG. 4 shows an example of a leak detection apparatus 200 according to the second embodiment of the present invention. FIG. 5 shows an example of a leak detection 20 system using the leak detection apparatus 200 according to the second embodiment of the present invention. 4 and 5, the same components as those in FIGS. 1 and 2 are denoted by the same reference numerals.

  As shown in FIG. 4, the leak detection apparatus 200 according to the second embodiment of the present invention includes a first feature value related to the amplitude of vibration detected by the first detection unit 111 and vibration detected by the second detection unit 112. The acquisition unit 201 that acquires the second feature value related to the amplitude of the pipe, and as a first method, the specification that specifies the leakage position 501 of the pipe 500 based on the first and second feature values acquired by the acquisition unit 201 Part 202.

  The leak detection apparatus 200 illustrated in FIG. 4 is different from the acquisition unit 101 in the first embodiment in that the acquisition unit 201 acquires not only the first feature value but also the second feature value. In this case, the second feature value acquired by the acquisition unit 201 includes a feature value related to the amplitude of vibration generated in the pipe 500 or the fluid flowing through the pipe 500. Further, in the leak detection apparatus 200, the point that the specifying unit 202 specifies the leak position based not only on the first feature value but also on the second feature value as the first method is the first embodiment. It is different from the specifying unit 102. Regarding other configurations and operations, the leak detection apparatus 200 in the second embodiment can be the same as the leak detection apparatus 100 in the first embodiment. Note that the acquisition unit 201 acquires the same type of value as the first feature value as the second feature value.

  In the leak detection device 200 according to the present embodiment, the first detection unit 111 detects a vibration of the pipe 500, and the second detection unit 112 detects a vibration of the pipe 500 between the detection position. The leak position 501 is specified as having the leak position 501. In addition, the leak detection apparatus 200 according to the present embodiment has one place between the leak position 501 and the detection position where the first detection unit 111 and the second detection unit 112 detect vibration of the pipe 500, respectively. It is shown that there is a leakage position 501 at the point. Or the leak detection apparatus 200 in this embodiment is one place between the detection position where the 1st detection part 111 and the 2nd detection part 112 each detect the vibration of the piping 500 between the leak positions 501. It is shown that there is a leakage position 501 in the predetermined range.

  In other words, the leak detection device 200 in the present embodiment has one location between the first detection unit 111 and the second detection unit 112 between the detection position where the vibration of the pipe 500 is detected. It may be indicated that there is a leak position at the point. Alternatively, the leak detection device 200 according to the present embodiment is configured such that the first detection unit 111 and the second detection unit 112 each have one predetermined position between the detection position and the detection position where the vibration of the pipe 500 is detected. It may be indicated that there is a leak position in the range. In any case, the leak detection apparatus 200 in the present embodiment can specify the leak position 501 with higher accuracy than the leak detection apparatus 100 in the first embodiment.

  An example of a method for specifying the leak position 501 by the leak detection apparatus 100 according to this embodiment will be described. As the first method, the specifying unit 102 specifies the leakage position 501 based on the relationship between the magnitude of the vibration amplitude indicated by the first feature value and the magnitude of the vibration amplitude indicated by the second feature value. This is explained in the first embodiment, and as shown in FIG. 6, the amplitude of vibration caused by the leakage of the pipe 500 changes according to the distance from the leakage position 501, for example, from the leakage position 501. This is because it decreases according to the distance.

  As an example, when the magnitudes of the vibration amplitudes indicated by the first and second feature values are equal, the specifying unit 202 includes the point where the first detection unit 111 on the pipe 500 detects vibration and the second detection unit 112. Can be identified as a leak position 501 as an intermediate point with respect to a point where vibration is detected. As another example, when the magnitude of the vibration amplitude indicated by the first feature value is larger than the magnitude of the vibration amplitude indicated by the second feature value, the specifying unit 102 is the first detection unit on the pipe 500. A point close to the point where 111 detects vibration can be specified as the leakage position 501. In this way, the specifying unit 202 can specify the leakage position 501.

  When the leakage position 501 is specified by the above-described example, the specifying unit 202 determines, as an example of the relationship regarding the magnitude of the vibration amplitude described above, the vibration amplitude caused by the leakage of the pipe 500 and the distance from the leakage position 501. The leak position 501 can be specified based on a function representing the relationship. By doing in this way, the specifying unit 202 specifies the leak position 501 with higher accuracy than when specifying the leak position 501 based only on the ratio of the magnitudes of vibration amplitudes indicated by the respective feature values. be able to.

More specifically, first, the magnitudes of vibration amplitudes indicated by the first feature value and the second feature value are set to V1 and V2, respectively. The distance between the point where each of the first detection unit 111 and the second detection unit 112 detects the vibration of the pipe 500 is r0, and the distance between the leakage point and the point where the first detection unit 111 detects the vibration. Is r1, and the distance between the leaked location and the point where the second detection unit 111 detects vibration is r2. If the function representing the first or second feature value at the position r from the leakage position 501 is F (r), the specifying unit 202 is based on r0, r1, and r2 that satisfy the following three expressions: The leakage position 501 can be specified.
V1 = F (r1) Formula (1)
V2 = F (r2) Formula (2)
r1 + r2 = r0 Formula (3)
The specifying unit 202 can use an arbitrary form as the function F (r). For example, an exponential function shown in Expression (4) can be used.
F (r) = A * exp (−k * r) Equation (4)
Further, the specifying unit 202 can use, for example, a polynomial type function shown in Expression (5) as the function F (r).
F (r) = a0 + a1 * r + a2 * r ^ 2 + Formula (5)
In equations (4) and (5), A, k, a0, a1, and a2 are coefficients that are appropriately determined according to factors that affect the relationship between the distance from the leakage position 501 and the first or second feature value. It is. As factors affecting the relationship between the distance from the leakage position 501 and the first or second feature value, for example, the type of the piping 500 including the diameter and material of the piping 500 to be detected for leakage and the piping 500 are installed. The surrounding environment or the installation status of the first detection unit 111 or the second detection unit 112 is included.

  The above factors can be grasped by examining the situation in which the pipe 500 or the pipe 500 is installed in advance. Further, when the above factors can be specifically grasped, a coefficient can be calculated from the specific factors based on a theoretical value and determined. Therefore, the specifying unit 202 can use the leak determination by determining a coefficient from the theoretical value based on the above-described factors.

  Further, the specifying unit 202 measures the vibration in the environment where the first detection unit 111 and the second detection unit 112 detect the vibration in advance in the environment where the first detection unit 111 and the second detection unit 112 detect the vibration. Can be determined based on.

  FIG. 7 shows an example of a method in which the specifying unit 202 determines the above-described coefficients based on measured values. In FIG. 7, the specifying unit 202 specifies a coefficient based on vibration applied to the pipe 500 by exciting at a predetermined point. That is, the characteristic value regarding the vibration amplitude when the applied vibration is detected by the first detection unit 111 and the second detection unit 112 is the position where the vibration is applied and the first detection unit as shown in FIG. And the 2nd detection part 112 changes according to the relationship with the position which detects a vibration, respectively. The specifying unit 202 determines a coefficient included in the function F (r) based on the change in the feature value. In this way, an appropriate function F (r) can be determined according to the type of piping 500 and its installation environment, and the specific accuracy of the leakage position 501 in the specifying unit 202 can be increased.

  Note that as the vibration applied to the pipe 500 by vibration, vibration having an arbitrary waveform can be used, but it is preferable to use an impact waveform, a chirp waveform, and a sine wave having a plurality of frequencies. Moreover, it is preferable that the vibration applied to the pipe 500 by vibration includes vibration at a frequency included in the leakage vibration in order to increase the accuracy of specifying the leakage position 501.

  Further, the specifying unit 202 includes a feature value related to the amplitude of vibration detected by each of the first detection unit 111 and the second detection unit 112, and each of the first detection unit 111 and the second detection unit 112. The leakage position 501 can be specified based on the relationship with the vibration detection sensitivity.

  As described above, according to the second embodiment of the present invention, the leak detection apparatus 200 specifies the leak position 501 based on the second feature value in addition to the first feature value in the specifying unit 202. Thereby, compared with the leak detection apparatus 100 in 1st Embodiment, the leak position 501 can be pinpointed more correctly.

  FIG. 5 shows an example of the configuration of the leak detection system 20 in the second embodiment of the present invention. According to FIG. 5, the leak detection system 20 includes a first detection unit 111 that detects vibration of the pipe 500 and a second detection that is provided at a position separated from the first detection unit and detects vibration of the pipe 500. It has the structure which has the part 112 and the leak detection apparatus 200 in the 2nd Embodiment of this invention.

In the leak detection system 20 illustrated in FIG. 5, the second detection unit 112 can have the same configuration as the first detection unit 111 described in the first embodiment. However, the configuration of the first detection unit 111 may be different from that of the second detection unit 112. In addition, the second detection unit 112 is provided at a position separated from the first detection unit 111. The position at which the second detection unit 112 is provided is the type of the pipe 500 to be specified for the leakage position 501, the configuration of the first detection unit 111 and the second detection unit 112, or the specification of the leakage position 501. It can be determined as appropriate based on required accuracy.
(Third embodiment)
Next, a second embodiment of the present invention will be described. FIG. 8 shows an example of a leak detection apparatus 300 according to the second embodiment of the present invention. FIG. 9 shows an example of a leak detection system 30 using the leak detection apparatus 300 according to the third embodiment of the present invention. In each of FIG. 8 or FIG. 9, the same reference numerals are assigned to the same components as those in FIG. 1 to FIG.

  As shown in FIG. 8, the leak detection device 300 according to the third embodiment of the present invention includes the first feature value related to the amplitude of vibration detected by the first detection unit 111 and the vibration detected by the second detection unit 112. An acquisition unit 301 for acquiring a second feature value relating to the amplitude of the first and a vibration arrival time detected by the first detection unit 111 and the second detection unit 112, and an amplitude indicated by the first feature amount The leak position 501 of the pipe 500 is specified by the first method based on the relationship between the magnitude of the amplitude and the magnitude of the amplitude represented by the second feature quantity, and further, the first feature section 111 and the second detection section 112 And a specifying unit 302 that specifies the leakage position 501 of the pipe 500 by the second method based on the information on the arrival time of vibration detected in each.

  The leak detection device 300 according to the third embodiment differs from the leak detection device 200 according to the second embodiment in the following points. First, the second embodiment is that the acquisition unit 301 acquires information about the arrival time of vibration detected by the first detection unit 111 and information about the arrival time of vibration detected by the second detection unit 112. This is different from the acquisition unit 201 of the leak detection apparatus 200 in FIG. The point that the specifying unit 302 specifies the leakage position 501 by using two methods of the first method based on the relationship between the amplitudes of vibrations and the second method based on the difference in arrival time. Different from the specifying unit 202 in the second embodiment. Regarding other configurations and operations, the leak detection apparatus 300 in the third embodiment can be the same as the leak detection apparatus 200 in the second embodiment.

  In the present embodiment, the acquisition unit 301 acquires the first feature value and the second feature value in the same manner as the acquisition unit 201 in the second embodiment. In addition, the acquisition unit 301 acquires information related to the arrival times of vibrations detected by the first detection unit 111 and the second detection unit 112, respectively.

  For example, the acquisition unit 301 acquires vibration waveforms detected by the first detection unit 111 and the second detection unit 112, respectively. Moreover, the acquisition part 301 acquires the arbitrary information regarding arrival time from the vibration which the 1st detection part 111 and the 2nd detection part 112 each detected. In this case, the acquisition unit 301 acquires the acquisition unit 101 by extracting arbitrary information related to the arrival time from the vibration detected by the first detection unit 111 and the second detection unit 112. can do. As another example, the acquisition unit 101 uses the vibrations acquired by the first detection unit 111 and the second detection unit 112 to perform an arbitrary process related to the arrival time at the first detection unit 111 and the second detection unit 112. It can be assumed that the information extracted is acquired.

  In this embodiment, the specifying unit 302 uses the second embodiment as a method for specifying the leakage position 501 based on the relationship between the magnitude of the amplitude indicated by the first feature quantity and the magnitude of the amplitude indicated by the second feature quantity. Can be used.

  In the present embodiment, the specifying unit 302 is a method for specifying the leakage position 501 by the second method based on the difference in arrival time of vibration detected by each of the first characteristic unit 111 and the second detection unit 112. A known method called an interphase method can be used. In general, the correlation method calculates a cross-correlation function of two vibration waveforms related to leakage vibrations detected at two points separated from each other, and leaks the pipe 500 from the time difference between the phases and the vibration propagation speed of the pipe 500. The position 501 is specified. The time difference at which the correlation is maximum in the cross-correlation function may change depending on the synchronization accuracy of the time at which leakage vibrations are detected at two points separated from each other. Therefore, the position specified as the leakage position 501 of the pipe 500 may also change according to the synchronization accuracy at this time. In the present embodiment, the identifying unit 302 identifies the leak position 501 using two methods, a first method based on the relationship between the amplitudes of vibrations and a second method based on the difference in arrival time. Thus, the position specifying error is reduced. Therefore, the leak detection apparatus 300 in this embodiment can specify the leak position 501 with higher accuracy.

  The specifying unit 302 further selects an arbitrary position from the leakage position 501 specified by using the two methods of the first method based on the relationship between the amplitudes of vibrations and the second method based on the difference in arrival time. The leakage position 501 can be specified by the determination procedure.

  As one identification method, the identification unit 302 obtains a predetermined range on the pipe 500 including the leakage position 501 by each method, and then leaks a range in which the predetermined range obtained by each method is common. The position 501 can be specified. FIG. 10 shows a range specified as the leak position 501 when this technique is used, and the specifying unit 302 has a common predetermined range on the pipe 500 obtained by each technique as the leak position 501. The area 1 that is the range can be specified as the leakage position 501. By doing in this way, the leak detection apparatus 300 in this embodiment can specify the leak position 501 with higher accuracy.

  The specifying unit 302 can specify the region 2 including at least one of the predetermined ranges on the pipe 500 obtained by the two methods as the leakage position 501. By doing in this way, the leak detection apparatus 300 in this embodiment can specify the predetermined range on the pipe 500 including the leak position 501 without leaking. The specifying unit 302 can appropriately select a region to be specified as the leak position 501 in accordance with the state of the pipe 500 that is the target of specifying the leak position 501 and the like.

  The specifying unit 302 may specify the leakage position 501 by a procedure other than this. For example, the specifying unit 302 obtains the detection accuracy of both methods by an arbitrary method, and the specifying unit 302 determines that the detection accuracy is high. The leak position 501 may be specified based on the result obtained by either method. In any procedure, the identifying unit 302 identifies the first method based on the relationship between the magnitudes of vibration amplitudes and the second method based on the difference in arrival time, thereby identifying The leak position 501 can be specified with higher accuracy.

  FIG. 9 shows an example of the configuration of the leak detection system 30 in the third embodiment of the present invention. According to FIG. 9, the leakage detection system 30 is provided with a first detection unit 111 that detects vibration of the pipe 500 and a second detection that is provided at a position separated from the first detection unit and detects vibration of the pipe 500. It has the structure which has the part 112 and the leak detection apparatus 300 in this embodiment.

  In the leak detection system 30 shown in FIG. 9, the first detection unit 111 and the second detection unit 112 are the same as the first detection unit 111 and the second detection unit 112 in the leak detection system 20 in the second embodiment. Basically the same configuration can be adopted.

The embodiments of the present invention have been described above. However, the present invention can adopt configurations other than the configurations in the embodiments described above without departing from the spirit of the present invention. Further, the configurations in the respective embodiments can be combined with each other without departing from the spirit of the present invention.
<Appendix>
(Appendix 1)
An acquisition unit for acquiring a first feature value related to the amplitude of vibration detected by the first detection unit;
A leak detection apparatus comprising: a specifying unit that specifies a leak position of a pipe by a first method based on the first feature value.
(Appendix 2)
The leak detection device according to appendix 1, wherein, as the first method, the specifying unit specifies a leak position of a pipe based on the amplitude indicated by the first feature value.
(Appendix 3)
The specifying unit, as the first method, determines the leak position of the pipe using the magnitude of the vibration amplitude indicated by the first feature value and the relationship between the change in the amplitude according to the distance from the leak position of the leak vibration. The leak detection device according to appendix 1 or 2, which is specified.
(Appendix 4)
As the first method, the specifying unit specifies the leak position of the pipe based on the relationship between the detection sensitivity of the first detection unit and the leak detection distance of the first detection unit. The leakage detection device according to any one of the above.
(Appendix 5)
The acquisition unit further acquires a second feature value related to the amplitude of vibration detected by a second detection unit that detects vibration of the pipe at a position separated from the first detection unit;
The leak detection according to any one of appendices 1 to 4, wherein, as the first method, the specifying unit specifies a leak position of a pipe based on the first feature value and the second feature value. apparatus.
(Appendix 6)
As the first method, the specifying unit specifies a leak position of a pipe based on a relationship between the amplitude indicated by the first feature amount and the amplitude indicated by the second feature amount. The leak detection device of appendix 5.
(Appendix 7)
The acquisition unit acquires information on an arrival time of vibration detected by the first detection unit, and information on an arrival time of vibration detected by the second detection unit,
The specifying unit specifies the leak position of the pipe by the second method based on the first method and the information on the arrival time of vibration detected by each of the first and second detection units. Leak detection device.
(Appendix 8)
As the second method, the specifying unit specifies a leak position of the pipe based on a difference in arrival times of vibrations indicated by information on arrival times of vibrations detected by the first and second detection units. , Leakage detection device according to appendix 7.
(Appendix 9)
A first detector for detecting vibration of the pipe;
A leak detection system comprising the leak detection device according to any one of appendices 1 to 4.
(Appendix 10)
A first detector for detecting vibration of the pipe;
A second detection unit that is provided at a position spaced from the first detection unit and detects vibration of the pipe;
A leak detection system comprising the leak detection device according to any one of appendices 5 to 8.
(Appendix 11)
Obtaining a first feature value related to the amplitude of vibration detected by the first detector;
And a step of specifying a leakage position of the pipe based on the first feature value.
(Appendix 12)
On the computer,
Processing for obtaining a first characteristic value related to the amplitude of vibration detected by the first detection unit;
The program which performs the process which specifies the leak position of piping based on a said 1st characteristic value.

10, 20, 30 Leakage detection system 100, 200, 300 Leakage detection device 101, 201, 301 Acquisition unit 102, 202, 302 Identification unit 111 First detection unit 112 Second detection unit 500 Piping

Claims (6)

A first characteristic value related to the amplitude of vibration detected by the first detection unit and a second value related to the amplitude of vibration detected by the second detection unit that detects vibration of the pipe at a position separated from the first detection unit. An acquisition unit for acquiring the feature value of
By the first method based on the first feature value and the second feature value , between the vibration detection position of the pipe by the first detection unit and the vibration detection position of the second detection unit. A leakage detection apparatus having a specific unit that identifies a position of a leakage that has occurred . As the first method, the specifying unit specifies a leak position of a pipe based on a relationship between the amplitude indicated by the first feature amount and the amplitude indicated by the second feature amount. The leak detection device according to claim 1 . The acquisition unit acquires information on an arrival time of vibration detected by the first detection unit, and information on an arrival time of vibration detected by the second detection unit,
The said specific | specification part specifies the leak position of piping by the 2nd method based on the said 1st method and the information regarding the arrival time of the vibration detected by each of the said 1st and 2nd detection part. or leakage detection device according to 2. A first detector for detecting vibration of the pipe;
A second detection unit that is provided at a position spaced from the first detection unit and detects vibration of the pipe;
A leak detection system comprising the leak detection device according to any one of claims 1 to 3 . A first characteristic value related to the amplitude of vibration detected by the first detection unit and a second value related to the amplitude of vibration detected by the second detection unit that detects vibration of the pipe at a position separated from the first detection unit. the feature value and the acquisition of,
Based on the first feature value and the second feature value , leakage occurred between the vibration detection position of the pipe by the first detection unit and the vibration detection position of the second detection unit. identifying the location, leak detection methods. On the computer,
A first characteristic value related to the amplitude of vibration detected by the first detection unit and a second value related to the amplitude of vibration detected by the second detection unit that detects vibration of the pipe at a position separated from the first detection unit. Processing for obtaining the feature value of
Based on the first feature value and the second feature value , leakage occurred between the vibration detection position of the pipe by the first detection unit and the vibration detection position of the second detection unit. And a program for executing the process of specifying the position of the computer.

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