WO2017154761A1 - 診断装置、診断システム、診断方法及びコンピュータ読み取り可能記録媒体 - Google Patents
診断装置、診断システム、診断方法及びコンピュータ読み取り可能記録媒体 Download PDFInfo
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- WO2017154761A1 WO2017154761A1 PCT/JP2017/008435 JP2017008435W WO2017154761A1 WO 2017154761 A1 WO2017154761 A1 WO 2017154761A1 JP 2017008435 W JP2017008435 W JP 2017008435W WO 2017154761 A1 WO2017154761 A1 WO 2017154761A1
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- WIPO (PCT)
- Prior art keywords
- pipe
- friction loss
- diagnostic
- pressure
- water
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
- G01N19/08—Detecting presence of flaws or irregularities
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
- F17D5/02—Preventing, monitoring, or locating loss
Definitions
- the present invention relates to a diagnostic apparatus, a diagnostic system, a diagnostic method, and a computer-readable recording medium.
- Patent Document 1 describes a technology related to nondestructive inspection of pipes.
- an actual measurement value representing a propagation speed of an acoustic disturbance propagating between two points separated in the longitudinal direction of the pipe is obtained.
- the wall thickness parameter is then calculated by fitting the measured value to the predicted value.
- the present invention has been made in order to solve the above-described problems, and has as its main object to provide a diagnostic device and the like for easily diagnosing the internal state of a pipe.
- a diagnostic apparatus includes: a friction loss calculating unit that calculates a friction loss of pressure based on the pressure of a fluid in a pipe; and a diagnostic unit that diagnoses the state of the inner surface of the pipe based on the friction loss. Prepare.
- the friction loss of the pressure is obtained based on the pressure of the fluid in the pipe, and the state of the inner surface of the pipe is diagnosed based on the friction loss.
- a process for obtaining the friction loss of the pressure based on the pressure of the fluid in the pipe and a process for diagnosing the state of the inner surface of the pipe based on the friction loss is stored temporarily.
- each component of each device or system represents a functional unit block. Part or all of each component of each apparatus or system is realized by an arbitrary combination of an information processing apparatus 1000 and a program as shown in FIG. 9, for example.
- the information processing apparatus 1000 includes the following configuration as an example.
- CPU Central Processing Unit
- ROM Read Only Memory
- RAM Random Access Memory
- a storage device 1005 that stores the program 1004
- a drive device 1007 that reads and writes the recording medium 1006
- a communication interface 1008 connected to the communication network 1009 -I / O interface 1010 for inputting / outputting data -Bus 1011 connecting each component
- Each component of each device in each embodiment is realized by the CPU 1001 acquiring and executing a program 1004 that realizes these functions.
- the program 1004 that realizes the function of each component of each device is stored in advance in the storage device 1005 or the RAM 1003, for example, and is read out by the CPU 1001 as necessary.
- the program 1004 may be supplied to the CPU 1001 via the communication network 1009, or may be stored in the recording medium 1006 in advance, and the drive device 1007 may read the program and supply it to the CPU 1001.
- each device may be realized by an arbitrary combination of an information processing device 1000 and a program that are different for each component.
- a plurality of components included in each device may be realized by any combination of one information processing device 1000 and a program.
- each device is realized by a general-purpose or dedicated circuit board including a processor or the like, or a combination thereof. These may be constituted by a single chip cage or may be constituted by a plurality of chip cages connected via a bus. Part or all of each component of each device may be realized by a combination of the above-described circuit and the like and a program.
- each device When some or all of the constituent elements of each device are realized by a plurality of information processing devices and circuits, the plurality of information processing devices and circuits may be centrally arranged or distributedly arranged. Also good.
- the information processing apparatus, the circuit, and the like may be realized as a form in which each is connected via a communication network, such as a client and server system and a cloud computing system.
- the diagnosis device and the like target a water supply network that supplies water and facilities provided in the water supply network.
- the object of control by the diagnostic device in each embodiment of the present invention is not limited to the water supply network.
- the pressure of the fluid in the pipe may be referred to as “the pressure of the pipe”.
- the friction loss of the pressure of the fluid in the pipe may be referred to as “the friction loss of the pressure” or “the friction loss of the pipe”.
- the diagnostic device 100 includes a friction loss calculating unit 110 and a diagnostic unit 120.
- the friction loss calculation unit 110 obtains a friction loss of pressure based on the pressure of the fluid in the pipe.
- the diagnosis unit 120 diagnoses the state of the inner surface of the pipe based on the friction loss.
- the diagnostic apparatus 100 may include a database 130.
- the database 130 stores the friction loss obtained by the friction loss calculation unit 110 and the result of the diagnosis performed by the diagnosis unit 120.
- FIG. 3 shows an example in which the diagnostic apparatus 100 according to the present embodiment is applied to a pipeline network 500 that is a water supply network.
- a pipeline network 500 shown in FIG. 3 mainly includes a water main 510 and one or more water distribution blocks 520.
- two water distribution blocks 520 of the water distribution block 520-1 and the water distribution block 520-2 are connected to the water main pipe 510.
- the water main 510 is composed of a plurality of pipes.
- the water main 510 supplies the water purified at the water purification plant 530 to each of the water distribution blocks 520.
- the water main 510 is provided with a pump 540 as an example.
- the water distribution block 520 supplies the tap water, which is a fluid sent from the water purification plant 530 via the water main 510, to each customer who is a user of water.
- the water distribution block 520 includes a plurality of pipes.
- a valve 550 is provided at a point where the water main 510 and the water distribution block 520 are connected.
- the valve 550 adjusts the pressure of clean water so that the pressure (water pressure) of clean water flowing through the water distribution block 520 has an appropriate magnitude.
- a valve 550-1 is provided at a point where the water main 510 and the water distribution block 520-1 are connected.
- a valve 550-2 is provided at a point where the water main pipe 510 and the water distribution block 520-2 are connected.
- Each of the water distribution blocks 520 may be further provided with a pump 540 and a valve 550 (not shown).
- a pressure sensor 140 is provided in the piping constituting the water distribution block 520.
- the water distribution block 520-1 is provided with pressure sensors 140-1 and 140-2.
- the pressure sensor 140 is attached to a fire hydrant or the like of the pipeline network 500.
- the pressure sensor 140 measures the water pressure that is the pressure of the water flowing in the pipe and its change over time. Information regarding the water pressure measured by the pressure sensor 140 is used when the diagnostic apparatus 100 obtains friction loss or the like, as will be described later.
- Information on pressure measured by the pressure sensor 140 is stored in a database or storage device (not shown) as necessary.
- the type and structure of the pressure sensor 140 are not limited, and the pressure sensor 140 of any type and structure is used. However, it is preferable that the pressure sensor 140 measures the pressure at a period that allows analysis described later. For example, the pressure sensor 140 preferably measures pressure at a cycle of 100 samples or more per second.
- the location where the pressure sensor 140 is provided is not limited to the example shown in FIG. That is, in the water distribution block 520, an arbitrary number of pressure sensors 140 are appropriately provided as necessary. Further, the pressure sensor 140 may be provided in the water main 510 so as to measure the water pressure inside the water main 510 and its change over time.
- the friction loss calculation unit 110 obtains the friction loss of the pressure of the fluid in the pipe based on the pressure of water or the like in the pipe.
- the friction loss of the pressure of the fluid in the pipe indicates the degree of decrease in the pressure of water or the like caused by friction with the inner wall surface of the pipe when water or the like flows through the pipe. More specifically, the friction loss calculation unit 110 obtains the friction loss of the pressure of the fluid in the pipe based on the transient change of the pressure of the fluid such as water in the pipe.
- the transient change in the pressure of the water fluid in the pipe represents a sudden change in the pressure.
- the transient change in the pressure of the water fluid in the pipe is also called water hammer.
- the pressure information measured by the two pressure sensors 140-1 and 140-2 shown in FIG. 3 is used as the pressure of the fluid such as water in the pipe and its transient change.
- the friction loss calculation part 110 calculates
- the valve 550 is suddenly opened and closed, the occurrence or collapse of an air reservoir in the water (for example, flowing through the pipe) in the pipe, and the use of the water of the consumer user A sudden opening and closing of the plug can occur.
- This change is also called water hammer as described above.
- Water hammer can also be caused by operating pumps 540, valves 550, fire hydrants (not shown), etc., provided at various locations in the pipe network 500. The water hammer propagates water in the pipe.
- the friction loss calculation unit 110 performs friction loss of a pipe based on a transient change in water pressure when each of the pressure sensors 140-1 and 140-2 measures one water hammer that has propagated through the water in the pipe. Ask for.
- the friction loss calculation unit 110 obtains the friction loss of the pressure of the fluid in the pipe as follows.
- the friction loss calculating unit 110 obtains the friction loss of the pressure of the fluid in the pipe based on the friction coefficient of the pipe using the water pressure measured by each of the pressure sensors 140-1 and 140-2.
- the change in water pressure when a water hammer occurs is expressed by the water hammer equation of motion shown in the following equation (1) and the continuous equation of water shown in the following equation (2). In this example, it is assumed that the state of the water flow in the pipe is turbulent.
- Equation (1) and (2) g is the acceleration of gravity, A is the cross-sectional area of the pipe, q is the flow rate of water flowing through the pipe, t is the time, h is the water pressure of the water in the pipe represented by the head, ⁇ is the friction coefficient of the pipe, D is the diameter of the water pipe, and a is the propagation velocity of water hammer in the pipe.
- x represents the distance in the longitudinal direction of the pipe whose friction loss is to be obtained. Note that h is a length dimension.
- Equation (3) is an equation representing water hammer as a wave motion.
- ⁇ is a propagation constant.
- e is the base of natural logarithm
- j is an imaginary unit
- ⁇ is the angular frequency of water hammer.
- ⁇ represents a propagation constant.
- the propagation constant ⁇ indicates the degree to which the propagation waveform propagating through the water in the pipe is attenuated or delayed according to the distance.
- ⁇ represents a water hammer attenuation rate.
- the attenuation rate ⁇ has frequency characteristics and is a function of each frequency ⁇ . That is, the coefficient of friction is obtained based on the speed of sound and the attenuation of the amplitude when the water hammer propagates in water.
- ⁇ is a function of water hammer propagation velocity.
- the water hammer time waveforms measured by the pressure sensors 140-1 and 140-2 are respectively represented as H 1 + h 1 and H 2 + h 2 .
- H 1 and H 2 represent pressures that can be measured when water constantly flows through the piping.
- H 1 and h 2 are fluctuations of the water pressure, that is, the water pressure measured by each of the pressure sensors 140-1 and 140-2 when water hammer occurs, and the case where water constantly flows through the pipe. The difference from the pressure that can be measured is shown.
- the above-described propagation constant ⁇ is expressed as the following equation (5).
- L represents a distance between points where each of the pressure sensors 140-1 and 140-2 measures the water pressure.
- h 1 and h 2 are obtained based on the measured values by the pressure sensors 140-1 and 140-2.
- L is determined according to the position where the pressure sensors 140-1 and 140-2 measure the pressure in the pipe. Therefore, the propagation constant ⁇ is obtained based on the ratio of fluctuations in the water pressure that are measured values by the pressure sensors 140-1 and 140-2.
- a representing the propagation velocity of water hammer in the pipe is obtained based on the difference in measurement time when the same water hammer is measured by each of the pressure sensors 140-1 and 140-2, for example. It is done. The a representing the propagation velocity of the water hammer can be obtained theoretically based on characteristics such as the material and diameter of the pipe.
- the friction loss calculation unit 110 uses the equations (4) and (5) based on the measurement values measured by the pressure sensors 140-1 and 140-2, and the friction coefficient ⁇ and the flow rate q of the pipe. Can be obtained.
- the pressure sensors 140-1 and 140-2 may measure a plurality of water hammers. Then, the friction loss calculation unit 110 uses each of the plurality of waveforms indicating water hammer measured by the pressure sensors 140-1 and 140-2, and multiplies the product of the friction coefficient ⁇ of the piping and the flow rate q with respect to each waveform. Can be obtained.
- the product of the friction coefficient ⁇ and the flow rate q thus determined may vary due to differences in frequency components, waveforms, amplitudes, etc., and measurement errors in each of the plurality of water hammers.
- the equation (4) includes ⁇ and ⁇ that are functions of frequency. Therefore, when the friction loss calculation unit 110 obtains the product of the friction coefficient ⁇ of the pipe and the flow rate q based on the above-described equations (4) and (5), ⁇ corresponds to the frequency component of the water hammer. May change.
- the friction loss calculating unit 110 may correct the above-described measurement variation or frequency variation by setting the friction coefficient of the steady flow as ⁇ eff .
- the product of the corrected steady flow friction coefficient ⁇ eff and the flow rate q is expressed by the following equation (6).
- C1 and C2 indicate correction coefficients.
- ⁇ eff (and the product of ⁇ eff and q) may be obtained using an expression different from the above-described expression (6). Further, ⁇ that is uncorrected may be used depending on the situation such as piping or water hammer. In the following description, ⁇ eff is used, but ⁇ may be used instead of ⁇ eff .
- equation (7) is an equation showing the relationship between the difference in pressure of water or the like in the pipe (pipe) at two points and the flow rate.
- the friction coefficient ⁇ or ⁇ eff depends on the flow rate. That is, these values are values that can change due to changes in the flow rate of water in the pipe. Therefore, using the above-described h 1 and h 2 obtained by the water pressure sensors 140-1 and 140-2 and the flow rate q obtained by the equation (7), the Hazen-Williams shown in the following equation (8) is used.
- the coefficient C is obtained.
- Expression (8) is an expression showing the relationship between the difference in pressure at two points related to the water in the pipeline and the flow rate.
- C is an example of a friction coefficient that does not depend on the flow rate of water.
- C is also a coefficient representing the small friction loss.
- the friction loss calculating unit 110 is configured to determine the pressure and flow rate between the pressure sensors 140-1 and 140-2 of the pipe and the surrounding points based on the water pressure measured by the pressure sensors 140-1 and 140-2. It is possible to obtain a relationship with Therefore, the friction loss calculation unit 110 is based on the water pressure measured by the pressure sensors 140-1 and 140-2, and the friction loss between the pressure sensors 140-1 and 140-2 in the pipe and the surrounding points. Can be obtained.
- the friction loss calculation unit 110 may construct a piping model based on the friction loss obtained as described above, for example.
- the piping model is a model representing friction loss at each point of the pipe network 500. That is, the friction loss calculation unit 110 constructs a piping model by obtaining the above-described Hazen-Williams coefficient C for each point of the pipeline network 500 based on the pressure obtained by the pressure sensor 140.
- the diagnosis unit 120 diagnoses the state of the inner surface of the pipe based on the friction loss of the pressure of the fluid in the pipe obtained by the friction loss calculation unit 110.
- the inner surface of a pipe deteriorates when used for a long period of time. That is, some problem occurs on the inner surface of the pipe. Examples of deterioration of the inner surface of the pipe include generation of rust and clogging, corrosion of the inner surface, increase in unevenness, and the like. As the inner surface of the pipe deteriorates, the friction loss changes. When deterioration occurs on the inner surface of a pipe, generally, friction loss increases according to the degree of deterioration. Therefore, the diagnosis unit 120 diagnoses the state of the inner surface of the pipe based on the magnitude of the friction loss and the temporal change in the magnitude of the friction loss.
- the diagnosis unit 120 uses the Hazen-Williams coefficient C described above as an example of friction loss. In this case, the diagnosis unit 120 determines that the friction loss is large when the value of C is small.
- the diagnosis unit 120 analyzes the state of the inner surface of the pipe based on the friction loss related to one pipe as an example. In this example, the diagnosis unit 120 determines that the inner surface of the pipe has deteriorated when the friction loss satisfies a predetermined condition.
- the predetermined condition includes, for example, a case where the friction loss increases beyond a threshold value.
- the value of the Hazen-Williams coefficient C is used as the friction loss, it is determined that the inner surface of the pipe has deteriorated when C is smaller than a threshold value.
- FIG. 4A is a graph regarding the friction loss when analyzing the state of the inner surface of the pipe based on the friction loss concerning one pipe.
- the vertical axis represents the Hazen-Williams coefficient C
- the horizontal axis represents the flow of time.
- the friction loss of the pipe increases (the Hazen-Williams coefficient C is small) depending on the time since the start of use. Then, with the passage of time, the friction loss of the pipe may reach the above-described threshold value. In the example shown in FIG. 4A, C reaches a threshold value at time t1. Therefore, the diagnosis unit 120 determines that the inner surface of the pipe has deteriorated at time t1.
- the above-described threshold value is statistically determined using, for example, the actually obtained friction loss of the pipe.
- the threshold value may be determined based on the material and diameter of the pipe.
- the threshold value may be determined based on the material of the pipe, the quality and flow rate of the water flowing through the pipe, the soil around the pipe, the presence or absence of stray current, and the like.
- the piping of high importance can detect the deterioration of the piping at an early stage in order to prevent a failure caused by the deterioration. Furthermore, since a large flow rate causes a large energy loss due to friction loss, it is preferable that this can be detected early when the friction loss is large. Therefore, the threshold value of such piping may be changed so that deterioration can be determined at an early stage. For example, when the value of the Hazen-Williams coefficient C is used as the friction loss, a larger C value may be used as the threshold value than in a normal case.
- the diagnosis unit 120 may analyze the state of the inner surface of the pipe based on the state of friction loss over time for one pipe.
- the diagnosis unit 120 for example, when the time change of the friction loss suddenly increases beyond a predetermined condition (that is, when the Hazen-Williams coefficient C rapidly decreases beyond a predetermined condition). It is determined that some abnormality has occurred inside the piping. Note that the abnormality in this case means that a sudden change (that is, large compared with the progress of normal deterioration) has occurred in the state of the inner surface of the pipe. Abnormality occurs due to, for example, something clogging inside the pipe or breakage of the pipe. Based on the determination result, for example, a pipe manager may perform a pipe inspection.
- the degree of increase in friction loss is relatively large immediately after the start of use, and gradually decreases with the passage of time since the start of use. That is, the degree of decrease in the Hazen-Williams coefficient C is relatively large immediately after the start of use, as shown in FIG. 4A described above, and with the passage of time since the start of use. Gradually get smaller. However, if any abnormality occurs in the pipe, the degree of increase in friction loss may increase.
- FIG. 4B An example of the change in the coefficient C in this case is shown in FIG. 4B.
- the coefficient C increases the degree of increase in friction loss in most of the portions surrounded by the dotted line.
- the value obtained by second-order differentiation of the temporal change in C is negative. Therefore, as the predetermined condition described above, the diagnosis unit 120 uses a condition as to whether or not the value obtained by second-order differentiation of the state of change in C is negative.
- the diagnosis unit 120 uses a condition as to whether or not the value obtained by second-order differentiation of the state of change in C is negative.
- the value obtained by second-order differentiation of the temporal change state of C is negative, for example, most of the time point surrounded by the dotted line in FIG. Judge that it occurred.
- the diagnosis unit 120 indicates that the state of increase (or decrease) exceeds a predetermined condition or the like from the approximate expression. It may be determined that some abnormality has occurred inside the pipe when it is detached.
- the above-mentioned conditions may be determined by statistically obtaining the state of friction loss over time.
- the diagnosis unit 120 may predict the state of the pipe deterioration or the time when the pipe deterioration becomes a predetermined state using the state of the friction loss over time and the threshold value regarding the above-described deterioration. For example, the diagnosis unit 120 predicts the time when the friction loss of the target pipe reaches a predetermined threshold from the state of the friction loss over time. Then, the diagnosis unit 120 predicts the time when the friction loss of the pipe reaches the threshold as the time when the deterioration of the pipe is in a predetermined state. The threshold value is determined based on the magnitude of friction loss when the pipe is in some state. In this case, the diagnosis unit 120 predicts the time when the pipe is in the state.
- the diagnosis unit 120 predicts the time when the piping is assumed to deteriorate. .
- the magnitude of friction loss when a pipe has deteriorated is, for example, the friction loss actually measured for pipes with similar conditions, such as the pipe material, diameter, water quality and flow rate of flowing water, and the environment surrounding the pipe. It is calculated using. Since the diagnosis unit 120 predicts the state of deterioration of the pipe in this way, it is possible to easily make a pipe repair plan and the like.
- the diagnosis unit 120 may analyze the state of the inner surface of the pipe based on the friction loss obtained for a plurality of points in the pipeline network 500.
- the diagnosis unit 120 creates a probability distribution of friction loss for a plurality of normal pipes such as newly laid pipes. Similarly, the diagnosis unit 120 creates a probability distribution of friction loss for a plurality of pipes that may be deteriorated, such as pipes that have been used for a long period of time. The diagnosis unit 120 determines that the inner surface of the pipe is deteriorated when the friction loss of the pipe is out of the distribution of the friction loss with respect to the normal pipe. Note that the probability distribution of friction loss for normal piping is, for example, created in advance and stored in the database 130 or the like. The diagnosis unit 120 acquires a probability distribution of friction loss as necessary when analyzing the state of the inner surface of the pipe. The probability distribution of friction loss may be updated at any time when the friction loss for normal piping is obtained.
- FIG. 5 is an example of the above probability distribution.
- the horizontal axis represents the Hazen-Williams coefficient C
- the vertical axis represents the probability density of C.
- the solid line represents the distribution of C with respect to the normal pipe
- the alternate long and short dash line represents the distribution of C with respect to the pipe that may be deteriorated.
- a threshold value is determined as indicated by a dotted line. Then, the diagnosis unit 120 determines whether or not the inner surface of the pipe has deteriorated based on whether or not C is within the threshold range when C is obtained as the friction loss by the friction loss calculation unit 110. Diagnose. That is, the diagnosis unit 120 determines that the inner surface of the pipe is deteriorated when C is out of the threshold value (on the side where the arrow is marked in the graph of FIG. 5). Further, when the friction loss probability distribution is updated, the threshold is updated according to the probability distribution.
- the friction loss calculating unit 110 obtains the friction loss of the pressure of the fluid in the pipe based on the water pressure of the water in the pipe measured by the pressure sensors 140-1 and 140-2 (step S101).
- the diagnosis unit 120 diagnoses the state of the inner surface of the pipe based on the friction loss obtained in step S101 (step S102).
- the diagnostic apparatus 100 when the diagnosis unit 120 analyzes based on the time change of the friction loss, or when analyzing pipes at a plurality of points in the pipeline network 500, the diagnostic apparatus 100 is configured as described above. Repeat the process.
- the diagnosis unit 120 analyzes based on the time change of the friction loss the diagnosis device 100 repeatedly performs the above-described process on the piping at the same point.
- the diagnostic apparatus 100 when analyzing the piping of the several points of the pipe network 500, the diagnostic apparatus 100 performs the above-mentioned process repeatedly with respect to the piping of a different point.
- the diagnostic device 100 diagnoses the state of the inner surface of the pipe based on the friction loss of the pressure of fluid such as water in the pipe. Friction loss changes due to deterioration of piping such as occurrence of rust and clogging, corrosion of the inner surface, and increased irregularities. Therefore, the diagnostic device 100 can accurately diagnose the state of deterioration of the inner surface of the pipe.
- the friction loss of the pressure of the fluid in the pipe is obtained based on the pressure of the fluid in the pipe.
- the pressure of the fluid in the pipe is obtained by the pressure sensor 140 attached to a fire hydrant or the like of the pipe network 500 as described above, for example. That is, the pressure is easily obtained as compared with the flow rate of the fluid in the pipe. Therefore, the diagnostic apparatus 100 according to the present embodiment can easily determine the internal state of the piping.
- the diagnostic device 100 may include the database 130 as described above.
- the database 130 stores the friction loss obtained by the friction loss calculation unit 110 and the result of the diagnosis performed by the diagnosis unit 120.
- FIG. 7 shows a configuration of a diagnostic apparatus 200 according to the second embodiment of the present invention.
- the diagnostic apparatus 200 according to the second embodiment of the present invention further includes an integrated determination unit 150 with respect to the diagnostic apparatus 100 according to the first embodiment of the present invention shown in FIG.
- the diagnostic apparatus 200 may further include the database 130 described above.
- the integrated determination unit 150 determines the state of the pipe based on the friction loss and another index related to the state of the pipe.
- Other indicators include, for example, the speed of sound of the pipe, the resonance frequency, the resonance sharpness, the presence or absence of leakage, and the like.
- an index different from the above-described index may be used as another index.
- the number of indexes used by the integrated determination unit 150 for determination is not particularly limited. That is, the integrated determination unit 150 may use the above-described plurality of indexes as other indexes. Further, the integrated determination unit 150 may use the diagnosis result of the diagnosis unit 120.
- the diagnostic apparatus 200 is configured to diagnose the state of the pipe using an index related to the state of another pipe different from the friction loss in addition to the friction loss described above.
- the integration determination unit 150 determines whether or not the piping is deteriorated as an example of the state of the piping. Further, when the piping is deteriorated, the integrated determination unit 150 may determine whether the piping is generally deteriorated or a specific problem occurs in the piping. The integrated determination unit 150 determines the state of the piping by obtaining, for example, a deterioration degree index based on the friction loss and other indexes. The deterioration degree index is obtained, for example, by weighting and adding to the friction loss and other indices. Alternatively, the deterioration degree index may be obtained using an index such as principal component analysis.
- the integrated judgment unit 150 is used when the deterioration degree index indicates that there is a problem with all the indicators of the pipe, or when one or more of the friction loss and other indicators indicate that the pipe is deteriorated. Judges that the piping is generally deteriorated. In addition, the integrated judgment unit 150 indicates that any of the indicators related to friction loss or other piping status indicates that the pipe has deteriorated, such as when the deterioration index indicates that there is a problem with a specific index. In this case, it is determined that the elements related to the specific index of the pipe are deteriorated. When the integrated determination unit 150 makes a determination using the deterioration degree index, the integrated determination unit 150 determines the piping state based on whether or not a predetermined condition is satisfied.
- the predetermined condition is, for example, that the deterioration degree index exceeds a predetermined threshold.
- the integrated determination unit 150 makes the above determination, it is possible to cope with the state of the piping. For example, when the integrated determination unit 150 determines that the pipe is generally deteriorated, measures such as replacement of the pipe are taken.
- the diagnosis unit 120 determines that the state of the inner surface of the pipe has deteriorated, but the other indicators indicate normal, the integrated determination unit 150 However, it is determined that the pipe itself is normal (for example, the pipe is not cracked or thinned). Therefore, in this case, the state of the pipe is improved by taking measures such as rehabilitation of the inner surface of the pipe without replacing the pipe. That is, by using the diagnostic device 200 according to the second embodiment of the present invention, it is possible to reduce costs and man-hours required for countermeasures when piping is deteriorated.
- the diagnostic apparatus 100 may include a mechanism that outputs the analysis result.
- FIG. 8 shows a diagnostic apparatus 300 according to the second embodiment of the present invention.
- the diagnostic device 300 according to the second embodiment of the present invention includes a friction loss calculating unit 110, a diagnostic unit 120, and a display unit 160.
- the display unit 160 displays the result of diagnosis by the diagnosis unit 120.
- the diagnostic apparatus 300 may include a reception unit 170.
- the accepting unit 170 accepts an input regarding diagnosis from a user of the diagnostic apparatus 300.
- the diagnostic device 300 according to the present embodiment is different from the diagnostic device 100 according to the first embodiment in that the diagnostic device 300 includes a display unit 160 and a reception unit 170.
- the diagnostic apparatus 300 is configured to include a mechanism for outputting the analysis result.
- the diagnostic apparatus 200 may further include the database 130 described above.
- the diagnostic apparatus 300 may include the integrated determination unit 150 of the diagnostic apparatus 200 according to the second embodiment of the present invention.
- the display unit 160 is realized by a display or the like, for example.
- the display unit 160 may be directly connected to the diagnosis unit 120 or may be connected via a communication network (not shown).
- the reception unit 170 is realized by a keyboard, a switch, or the like, for example.
- the receiving unit 170 may be realized by a touch panel configured integrally with the display unit 160.
- the reception unit 170 may be directly connected to the diagnosis unit 120 or may be connected via a communication network (not shown).
- the display unit 160 may be realized in such a manner that necessary information is displayed on a display included in another information processing apparatus such as a PC (Personal Computer), a smartphone, or a tablet.
- the accepting unit 170 may be realized in a manner of accepting information from input means included in these information processing apparatuses.
- the display unit 160 displays, for example, a diagnosis result regarding the internal state of the pipe obtained by the diagnosis unit 120.
- the display unit 160 displays, for example, the degree of pipe deterioration.
- the display unit 160 may display the degree of deterioration divided into several stages, or may display the degree of deterioration numerically.
- the display unit 160 may display a diagnosis result regarding a specific point of the pipeline network 500 according to a diagnosis result, or may display a diagnosis result regarding a plurality of points of the pipeline network 500. Also good.
- the display unit 160 displays the result of diagnosis for a plurality of points on the pipeline network 500, for example, a part or all of the pipeline network 500 may be displayed together. In this case, the display unit 160 may highlight and display a point where the pipe is determined to be deteriorated, a main pipe, or the like.
- the display unit 160 may display the friction loss obtained by the friction loss calculation unit 110 together with the result of diagnosis by the diagnosis unit 120.
- the accepting unit 170 accepts information on the necessity of diagnosis or information on the location to be diagnosed in the pipeline network 500.
- the reception unit 170 may receive information for designating a location where the detailed diagnosis results are to be displayed.
- the reception unit 170 may receive information specifying the diagnosis interval.
- the diagnosis unit 120 predicts the deterioration time of the pipe
- the reception unit 170 may receive an instruction regarding the location of the point where the deterioration time should be predicted.
Abstract
Description
・ROM(Read Only Memory)1002
・RAM(Random Access Memory)1003
・RAM1003にロードされるプログラム1004
・プログラム1004を格納する記憶装置1005
・記録媒体1006の読み書きを行うドライブ装置1007
・通信ネットワーク1009と接続する通信インターフェース1008
・データの入出力を行う入出力インターフェース1010
・各構成要素を接続するバス1011
各実施形態における各装置の各構成要素は、これらの機能を実現するプログラム1004をCPU1001が取得して実行することで実現される。各装置の各構成要素の機能を実現するプログラム1004は、例えば、予め記憶装置1005やRAM1003に格納されており、必要に応じてCPU1001が読み出す。なお、プログラム1004は、通信ネットワーク1009を介してCPU1001に供給されてもよいし、予め記録媒体1006に格納されており、ドライブ装置1007が当該プログラムを読み出してCPU1001に供給してもよい。
まず、本発明の第1の実施形態について説明する。なお、以下の説明においては、「配管内の流体の圧力」を「配管の圧力」と称する場合がある。また、「配管内の流体の圧力の摩擦損失」を「圧力の摩擦損失」又は「配管の摩擦損失」と称する場合がある。
(1)式及び(2)式において、gは重力加速度、Aは配管の断面積、qは配管を流れる水の流量、tは時間、hは水頭で表された配管内の水の水圧、λは配管の摩擦係数、Dは配水管の直径、aは配管内における水撃の伝搬速度を表す。xは摩擦損失を求める対象とされた配管の長手方向の距離を表す。なお、hは、長さの次元となる。
本発明の第1の実施形態には、変形例が考えられる。
次に、本発明の第2の実施形態について説明する。図7は、本発明の第2の実施形態における診断装置200の構成を示す。本発明の第2の実施形態における診断装置200は、図1に示す本発明の第1の実施形態における診断装置100に対して、統合判断部150を更に備える。なお、診断装置200は、上述したデータベース130を更に備えてもよい。
また、別の変形例の一つとして、診断装置100は、分析の結果を出力する機構等を備えてもよい。
110 摩擦損失算出部
120 診断部
130 データベース
140 圧力センサ
500 管路網
510 水道本管
520 配水ブロック
530 浄水場
540 ポンプ
550 バルブ
1000 情報処理装置
1001 CPU
1002 ROM
1003 RAM
1004 プログラム
1005 記憶装置
1006 記録媒体
1007 ドライブ装置
1008 通信インターフェース
1009 通信ネットワーク
1010 入出力インターフェース
1011 バス
Claims (15)
- 配管内の流体の圧力に基づいて、前記圧力の摩擦損失を求める摩擦損失算出手段と、
前記摩擦損失に基づいて、前記配管の内面の状態を診断する診断手段とを備える診断装置。 - 前記診断手段は、前記摩擦損失の大きさが所定の条件を満たすか否かに基づいて前記配管の内面の状態を診断する、請求項1に記載の診断装置。
- 前記診断手段は、前記摩擦損失の大きさが所定の閾値を超える場合に前記配管が劣化していると診断する、請求項1又は2に記載の診断装置。
- 前記閾値は、正常とされた前記配管に関する前記摩擦損失の大きさの確率分布に基づいて定められる、請求項3に記載の診断装置。
- 前記確率分布は、正常とされた前記配管に関する前記摩擦損失が求められた場合に更新される、請求項4に記載の診断装置。
- 前記診断手段は、前記摩擦損失の時間変化及び前記閾値に基づいて、前記配管の劣化が所定の状態となる時期を予測する、請求項3から5のいずれか一項に記載の診断装置。
- 前記診断手段は、前記摩擦損失の時間変化が所定の条件を満たすか否かに基づいて前記配管の内面の状態を診断する、請求項1から6のいずれか一項に記載の診断装置。
- 前記診断手段は、前記摩擦損失の時間変化が所定の条件を超えて大きくなった場合に前記配管の内面に異常が生じていると診断する、請求項1から6のいずれか一項に記載の診断装置。
- 前記時間変化に関する前記所定の条件は、前記時間変化の変化率に基づいて定められる、請求項8に記載の診断装置。
- 前記摩擦損失及び前記摩擦損失と異なる他の指標に基づいて前記配管の状態を判断する統合判断手段を備える、請求項1から9のいずれか一項に記載の診断装置。
- 前記統合判断手段は、前記診断手段が前記配管の内面が劣化していると診断し、かつ前記他の指標が正常であることを示す場合に、配管の内面が劣化していると診断する、請求項10に記載の診断装置。
- 前記統合判断手段は、前記診断手段が前記配管の内面が劣化していると診断し、かつ前記他の指標の少なくとも一つが配管の劣化を示す場合に、配管が全般的に劣化していると判断する、請求項10又は11に記載の診断装置、
- 配管の複数点にて前記配管内の圧力を取得する圧力取得手段と、
請求項1から12のいずれか一項に記載の診断装置とを備える診断システム。 - 配管内の流体の圧力に基づいて、前記圧力の摩擦損失を求め、
前記摩擦損失に基づいて、前記配管の内面の状態を診断する診断方法。 - コンピュータに、
配管内の流体の圧力に基づいて、前記圧力の摩擦損失を求める処理と、
前記摩擦損失に基づいて、前記配管の内面の状態を診断する処理とを実行させるプログラムを格納したコンピュータ読み取り可能記録媒体。
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