JP6850748B2 - Water pressure gauge placement support system and method - Google Patents

Description

The present invention relates to a technique for estimating the water leakage distribution in a piping network using a water pressure gauge.

Conventionally, it is known that the distribution of water leakage in a water pipe network is estimated based on hydraulic calculation using a pipe network model and measurement data of a water pressure gauge installed in the pipe network.

For example, in Patent Document 1, an area that divides a pipe network into a measurement information collecting unit that collects measured values from a measuring device installed in a water pipe network, a risk information calculation unit that calculates a water leakage risk value from pipeline information, and a pipe network. Disclosed is a device including a zone configuration that integrates adjacent areas and a leak distribution estimation unit that estimates a parameter consisting of a set of leak strengths of each zone in the zone configuration. In this device, the leak distribution estimation unit further includes the zone index calculation unit that calculates the zone index based on the zone configuration, and the predicted value and measurement calculated by the pipeline calculation assuming the leak distribution based on the parameters and risk values. It is provided with an error index calculation unit that calculates an error index from the difference from the value, and an optimum parameter search unit that searches for an optimum parameter that minimizes an index based on both the zone index and the error index.

Japanese Unexamined Patent Publication No. 2016-53250

In the technique of Patent Document 1, the target pipe network is first divided into small areas, then a water pressure gauge is installed in the area, and finally the measurement data is acquired and analyzed to estimate the amount of water leakage in each area. By focusing on the area where it is estimated that there is a lot of water leakage, it is possible to deal with the water leakage efficiently.

In the technique of Patent Document 1, the area required for estimation can be determined from the water pressure gauge arrangement position, or the water pressure gauge arrangement position can be determined from the area. In this way, if one is determined, the other can be determined, but the method of constructing both from the state where the area and the position of the water pressure gauge are not determined is not disclosed.

Therefore, a technique for determining the water pressure gauge placement position and the measurement range (area) of the water pressure gauge in order to estimate water leakage in the water distribution pipe network with desired accuracy from the state where the area and the water pressure gauge placement position are not determined. desired.

A preferred aspect of the present invention is a water pressure gauge placement support method that uses an information processing device to support the placement of the water pressure gauge on the pipe network. In this method, the pipe network model data simulating the pipe network and the water pressure gauge specification data including the specifications of the water pressure gauge are used. Then, for each of a plurality of conditions consisting of a combination of water pressure counting and target accuracy, from the arrangement position of the water pressure gauge on the pipe network and the arrangement of the area corresponding to the arrangement position based on the pipe network model data and the water pressure gauge specification data. The first process of calculating a plurality of area configurations, the second process of calculating the placement evaluation value for each of the plurality of area configurations calculated in the first process, and the first process based on the placement evaluation value. A third process of extracting candidates to be presented is performed for each water pressure count from the plurality of area configurations calculated in the above process.

Another preferable aspect of the present invention is a pipe network model database that stores pipe network model data simulating a pipe network, a water pressure gauge specification database that stores water pressure gauge specification data including specifications of a water pressure gauge, and a water pressure gauge arrangement. It is a water pressure gauge placement support system including an index adjustment / calculation unit, an input device, and an output device. In this system, the water pressure gauge placement index adjustment / calculation unit places the water pressure gauge on the pipe network based on the pipe network model data and the water pressure gauge specification data for each of multiple conditions consisting of a combination of water pressure counting and target accuracy. A plurality of area configurations consisting of a position and an area arrangement corresponding to the arrangement position are calculated, an arrangement evaluation value is calculated for each of the calculated area configurations, and a plurality of calculated area configurations are calculated based on the arrangement evaluation value. From the area configuration, candidates to be presented are extracted for each water pressure count.

From the state where the area configuration and the water pressure gauge placement position are not determined, the water pressure gauge placement position and the measurement range (area) of the water pressure gauge can be determined in order to estimate the water leakage in the water pipe network with desired accuracy. ..

The overall block diagram of the water pressure gauge arrangement support system which concerns on Example 1. FIG. The figure which shows an example of the data stored in the water pressure gauge specification database. An overall flowchart of the processing performed by the water pressure gauge placement index adjustment / calculation unit. A flowchart of processing performed by the water pressure gauge placement position search unit. Flowchart of processing performed by the area calculation unit. A conceptual diagram explaining the concept of processing performed by the water pressure change amount calculation unit. The chart which shows the relationship between the leakage position and the amount of change in water pressure at each node. Flowchart of processing performed by the water pressure change amount calculation unit. The conceptual diagram explaining the concept of processing of an area calculation part. A chart showing the relationship between the leak position and the amount of change in water pressure at each node, and the range in which the amount of change in water pressure corresponding to the target accuracy can be detected. A conceptual diagram explaining the meaning of the placement evaluation value. A chart showing the relationship between the leak position and the amount of change in water pressure at each node, and the range in which the amount of change in water pressure corresponding to the target accuracy can be detected. The figure which shows an example of the data format of the water pressure gauge arrangement result database. The plan view which shows the example of the calculation result display screen of a water pressure gauge arrangement position. The figure which shows the example of the leakage risk data. A conceptual diagram illustrating an example of an area configuration that does not consider the risk of water leakage. A conceptual diagram illustrating an example of an area configuration considering the risk of water leakage. The overall block diagram of the water pressure gauge arrangement support system which concerns on Example 3. A table diagram showing an example of the data format of the pipeline asset database. A flowchart of processing performed by the water pressure gauge placement position search unit.

The embodiment will be described in detail with reference to the drawings. However, the present invention is not construed as being limited to the description of the embodiments shown below. It is easily understood by those skilled in the art that a specific configuration thereof can be changed without departing from the idea or gist of the present invention.

In the configuration of the invention described below, the same reference numerals may be used in common among different drawings for the same parts or parts having similar functions, and duplicate description may be omitted.

When there are a plurality of elements having the same or similar functions, they may be described by adding different subscripts to the same code. However, if it is not necessary to distinguish between a plurality of elements, the subscript may be omitted for explanation.

The notations such as "first", "second", and "third" in the present specification and the like are attached to identify the constituent elements, and do not necessarily limit the number, order, or contents thereof. is not it. In addition, numbers for identifying components are used for each context, and numbers used in one context do not always indicate the same composition in other contexts. Further, it does not prevent the component identified by a certain number from having the function of the component identified by another number.

The position, size, shape, range, etc. of each configuration shown in the drawings and the like may not represent the actual position, size, shape, range, etc. in order to facilitate understanding of the invention. Therefore, the present invention is not necessarily limited to the position, size, shape, range, etc. disclosed in the drawings and the like.
Components represented in the singular form herein shall include the plural form unless explicitly indicated in the context.

First, one of the examples described below will be described. In the system of this embodiment, it is used for presenting an appropriate water pressure gauge arrangement position and area configuration to a user who uses a water leakage estimation technique using hydraulic analysis and water pressure gauge measurement data.

More specifically, in the system of this embodiment, a pipe network model simulating the target water distribution pipe network and the number and specifications of water pressure gauges that can be installed can be used as prerequisite data. Then, under the conditions of the given number of water pressure gauges and the index (target accuracy) for determining the shape and size of the area, the placement position, area configuration, and placement evaluation value of the water pressure gauges are calculated based on the premise data.

More specifically, under the given number of water pressure gauges and the condition of target accuracy, multiple patterns of possible water pressure gauge placement positions and area configurations are calculated, and the placement position and area where the placement evaluation value is maximized are calculated. Extract the configuration. Then, at least two of the number of water pressure gauges, the target accuracy, and the placement evaluation value are presented to the user as related information. The user selects at least one of the number of water pressure gauges, the target accuracy, and the placement evaluation value based on the presented information, and the system presents the placement position and area configuration of the water pressure gauges based on the selection.

In this specification and the like, an example of extracting the case where the placement evaluation value is the maximum value is described, but since it is obvious that the reciprocal is taken as the definition of the placement evaluation value, it becomes the minimum value. Unless otherwise specified, the meaning of the maximum value shall include the minimum value.

The target accuracy means the lower limit leakage amount at the time of estimating the leakage of the target area. That is, it can be said that the water pressure gauge can detect the leakage of water exceeding the target accuracy that occurs in the area of the water pressure gauge. If the target accuracy is small, it means that the system is performing high-precision estimation. The water pressure gauge arrangement position and area configuration set by the following examples can then be used in the water leakage estimation technique in the prior art such as Patent Document 1. At that time, the target accuracy is the one that expresses the minimum amount of water leakage, which is aimed at estimation in each area.

In this embodiment, the area means the range in charge of measurement of the water pressure gauge. The area is equivalent to the range (measurable range) where the water pressure gauge can measure water leakage with the target accuracy. The arrangement of water pressure gauges and areas in the water distribution pipe network is called area composition.

<Overall system configuration>
FIG. 1 is an overall configuration diagram of the water pressure gauge arrangement support system according to the first embodiment. This system is realized by running a program on a normal server. As is well known, a server is a kind of computer and includes an input device, an output device, a processing device, and a storage device as hardware elements. In this embodiment, functions such as calculation and control are realized in cooperation with other hardware by executing a program stored in the storage device by the processing device.

The water pressure gauge placement support system 100 is a result aggregation / screen output unit 101, a water pressure gauge placement index adjustment / calculation unit 102, and a water pressure gauge placement position search unit as functional components realized by the processing device of the server executing a program. It includes 103, an area calculation unit 104, a water pressure change amount calculation unit 105, and a pipe network calculation unit 106. Further, as the data stored in the storage device, it has a pipe network model database 107, a water pressure gauge specification database 108, and a water pressure gauge arrangement result database 109. It also includes an input device 110 and an output device 111. The input device 110 is, for example, a keyboard, and the output device 111 is, for example, an image monitor, but other well-known configurations may be used.

The above configuration may be configured by a single server, or any part of the input device, output device, processing device, and storage device may be configured by another computer connected by a network.

The result aggregation / screen output unit 101 controls the input device 110 and the output device 111, and receives an instruction from the user 112 to start calculation for determining the position of the water pressure gauge. In addition, the obtained calculation result is displayed, and the user 112 assists the operation for determining the position of the water pressure gauge. The details of the information displayed on the output device 111 for this purpose will be described later with reference to FIG.

The water pressure gauge placement index adjustment / calculation unit 102 collaborates with other functional components to create data necessary for presenting the calculation result of the water pressure gauge placement position to the user. In this embodiment, the water pressure gauge arrangement index adjustment / calculation unit 102 supervises the entire processing by giving instructions to other functional parts and using them as subroutines, but all the functions are configured by one functional part. However, the basic concept does not change.

The water pressure gauge placement position search unit 103 calculates the optimum water pressure gauge placement position based on the water pressure count, the type, and the target accuracy given by the water pressure gauge placement index adjustment / calculation unit 102.

The area calculation unit 104 calculates the area configuration based on the target accuracy, the water pressure gauge placement position, and the water pressure gauge type given by the water pressure gauge placement position search unit 103.

The water pressure change amount calculation unit 105 calculates the water pressure change in the pipe network when water leakage occurs under the condition of the target accuracy given by the area calculation unit 104.

The pipe network calculation unit 106 performs pipe network calculation using the data of the pipe network model database 107 as a subroutine of the water pressure change amount calculation unit 105.

The pipe network model database 107 is a database that stores data obtained by modeling the water distribution pipe network as a pipe network.

The water pressure gauge specification database 108 is a database relating to the specifications of the water pressure gauge to be installed.

The water pressure gauge arrangement result database 109 is a database that stores the result of calculating the arrangement of the water pressure gauge.

<Pipe network model database>
In this embodiment, the pipe network model database 107 stores data obtained by modeling the water distribution pipe network to be monitored for water leakage. The pipeline model is a graph structure of the pipeline connection of the pipeline, that is, a node (node) and a link (pipeline). It can be said that the pipeline model is modeled as a collection of pipelines connecting nodes.

The data of the pipeline model database 107 is used for the pipeline calculation in the pipeline calculation unit 106. Pipe network calculations simulate a network of distribution pipes and reproduce the flow of water under specific conditions. The data of the pipeline model database 107 includes, for example, pipeline information, node information, and pattern information. The pipeline information is a collection of IDs, lengths, diameters, and the like of the pipelines constituting the pipeline. The node information represents the arrangement ponds, tanks, consumers, etc. existing in the pipe network. The pattern information expresses various patterns used for the pipe network calculation, and can express the time-specific values such as the demand amount, the head of the tank, and the pump pressure.

As for the pipe network model, the pipe network model database, and the pipe network calculation itself, detailed explanations are omitted because publicly known technologies such as Patent Document 1 are accumulated. In this embodiment, the pipe network calculation unit 106 cooperates with the water pressure change amount calculation unit 105, and when the position and amount of water leakage in the pipe network and the position of the water pressure gauge are given, the pipe network model database 107 It suffices if the change in water pressure at the position of the water pressure gauge can be calculated based on the data.

<Water pressure gauge specification database>
In this embodiment, the water pressure gauge specification database 108 is a database that expresses the specifications of the water pressure gauge to be installed.

FIG. 2 shows an example of data (water pressure gauge specification information) stored in the water pressure gauge specification database 108. In terms of how to read the database, the attribute name 201 is placed on the left side of the table, and the attribute value 202 is placed on the right side. In the example of FIG. 2, the "water pressure gauge ID" describes the type of water pressure gauge specified by "PG_1". If there are multiple types of water pressure gauges, there will be multiple columns of attribute values. In the example of FIG. 2, the data for each type of water pressure gauge is used, but the data for each solid of the water pressure gauge may be used.

The water pressure gauge specification information is a summary of the specifications of the water pressure gauge to be installed. "Accuracy grade" is a classification of the accuracy of the water pressure gauge. "Span" indicates the range of water pressure that can be measured by a water pressure gauge. The "minimum scale value" indicates the minimum value of water pressure that can be measured by the water pressure gauge. In FIG. 2, the span of the water pressure gauge is shown to be 1 Mpa and the minimum scale value is shown to be 0 Mpa, and it can be seen that measurement is possible from 0 to 1 Mpa. The "measurement frequency" is the set frequency of water pressure measurement. The "installable number" is the number of water pressure gauges that can be installed in the pipe network, for example, the number of water pressure gauges in stock. The data may include price and other data.

The span and measurement frequency are used to calculate the significant change in water pressure in each water pressure gauge. In addition, the number of installations affects the number of calculations for water pressure gauge placement. The installation price can be used to display the relationship between the target accuracy and installation evaluation value and the water pressure gauge placement cost on the calculation result screen.
Note that, instead of or in addition to the accuracy grade and span, measurement error and scale width data may be provided.

<Overall processing flow>
FIG. 3 is an overall flowchart of the processing performed by the water pressure gauge placement index adjustment / calculation unit 102 of the water pressure gauge placement support system 100. The start trigger of this process is, for example, when the user 112 gives an explicit instruction. Alternatively, a predetermined condition may be automatically performed as a trigger.

In this process, using the data of the pipe network model database 107 and the water pressure gauge specification database 108, the possible arrangement and area of the water pressure gauges are calculated for each combination of the number of the water pressure gauges to be arranged and the target accuracy. Then, based on the placement evaluation value, the optimum water pressure gauge placement position and the target accuracy at that time are calculated for each number of water pressure gauges. Various optimization methods (simplex method, etc.) can be used for this process. The concept of the placement evaluation value will be described in detail later. The calculation result of the water pressure gauge arrangement index adjustment / calculation unit 102 is input to the result aggregation / screen output unit 101 and presented to the user 112 by the output device 111. Hereinafter, it will be described with reference to FIG.

In the process S301, the water pressure gauge arrangement index adjustment / calculation unit 102 initializes the number of water pressure gauges. Normally, the initial value of the water pressure count is "1", and this is incremented by the process S302 up to the maximum number of water pressure counts that can be installed (hereinafter referred to as "maximum number that can be installed"). The maximum number that can be installed is the total value of the "number that can be installed" in the hydraulic pressure gauge specification database 108 of FIG. Alternatively, the user 112 may set an arbitrary value as the maximum number that can be installed.

In the process S303, the water pressure gauge arrangement index adjustment / calculation unit 102 initializes the target accuracy. The target accuracy may be given in advance, or the user 112 may set an arbitrary value from a practical point of view each time. The target accuracy is a detectable amount of water leakage per hour, and is set to, for example, 50 m ³ / h. As the initial value, for example, the upper limit (or lower limit) of the assumed target accuracy is set.

In the process S304, the water pressure gauge placement index adjustment / calculation unit 102 sends the water pressure count and the target accuracy to the water pressure gauge placement position search unit 103. The water pressure gauge placement position search unit 103 starts processing triggered by the input of the water pressure count and the target accuracy. The water pressure gauge placement position search unit 103 calculates the water pressure gauge placement position (and the type of water pressure gauge installed at each position) with the highest placement evaluation value under the given water pressure count and target accuracy conditions, and places the water pressure gauge. It is returned to the index adjustment / calculation unit 102. The process of the water pressure gauge arrangement position search unit 103 will be described in detail later with reference to FIG.

In the process S305, the water pressure gauge placement index adjustment / calculation unit 102 acquires the water pressure gauge placement position and the placement evaluation value from the water pressure gauge placement position search unit 103.

In the process S306, it is evaluated whether or not the arrangement evaluation value is maximized in the water pressure count set in the process 302.

In the process S307, the target accuracy is adjusted when the arrangement evaluation value is not the maximum. In the adjustment, for example, the accuracy is lowered (or increased) by a predetermined value. After that, in the process S304, the water pressure gauge arrangement position search unit 103 is started again.

In the process S308, the water pressure gauge placement result having the maximum placement evaluation value is stored in the water pressure gauge placement result database 109. It should be noted that not only the one with the maximum placement evaluation value but also all the calculated results may be saved.

In the process S309, it is determined whether or not the water pressure count is the maximum number that can be installed, and if it is the maximum number that can be installed, the result totaling / screen output unit 101 is started in order to present the result to the user in the process S310. .. If it is not the maximum number, the water pressure count is incremented in the process S302, and the same process is performed.

In the process S310, the water pressure gauge placement index adjustment / calculation unit 102 aggregates the presentation data, which is the calculation result in which the target accuracy and the placement evaluation are associated with the area configuration that is the candidate to be presented, for each water pressure count. It is sent to the screen output unit 101. The result aggregation / screen output unit 101 creates a display screen based on the presented data and displays it on the output device 111.

As the calculation result, for example, for each of the water pressure counts, the set of the area configuration and the target accuracy showing the highest placement evaluation value is sent as the associated data. The result aggregation / screen output unit 101 aggregates the calculation results, graphs them, and displays them on the output device 111.

<Processing of water pressure gauge placement position search unit (first half)>
FIG. 4 is a flowchart illustrating the process S304 performed by the water pressure gauge arrangement position search unit 103. The water pressure gauge placement position search unit 103 has the highest placement evaluation value of the water pressure gauge placement position (and the water pressure installed at each position) under the conditions of the water pressure count and the target accuracy given by the water pressure gauge placement index adjustment / calculation unit 102. Calculate and return the total type). The start trigger is when the water pressure count and the target accuracy are input from the water pressure gauge arrangement index adjustment / calculation unit 102.

In the process S401, the number of water pressure gauges set in the process S302 and the target accuracy adjusted in the process S307 are acquired.

In the process S402, the specifications of each water pressure gauge that can be installed and the maximum number that can be installed are acquired from the water pressure gauge specification database 108.

In the process S403, the number of water pressure gauges set in the process S302 is arranged at random locations in the water distribution pipe network defined by the model of the pipe network model database 107. From the water pressure gauges that can be installed in the water pressure gauge specification database 108, the number of water pressure gauges set in the process S302 can be selected, and the specifications of the water pressure gauges can be assigned at the same time. At this time, candidate coordinates to be placement candidates may be set in advance, and the placement position may be randomly selected from the candidate coordinates and placed. As the candidate coordinates, for example, it may be set for each predetermined length of the pipeline (for example, 100 m). Alternatively, the node of the pipeline may be used as the candidate coordinate.

When the node of the pipeline is used as the candidate coordinate, all the nodes or the nodes limited by some method (only the nodes with demand, only the nodes where the daily water pressure fluctuation is not large, other user-specified, etc.) are selected. It may be done as a target. Various known combinatorial optimization methods (genetic algorithms, etc.) can be used from random placement (S403) to change of placement position (S407). The type of water pressure gauge to be installed is also randomly selected. However, if the water pressure at the installation location cannot be measured (outside the measurement range), re-install.

In the process S404, the process of the area calculation unit 104 is executed. The area calculation unit 104 calculates the area configuration based on the given target accuracy and the water pressure gauge placement position (and the type of water pressure gauge at each placement position). The processing of the area calculation unit 104 will be described in detail later with reference to FIG.

In the process S405, the arrangement evaluation value is calculated for the area configuration. The placement evaluation value will be described in a separate section.

In the process S406, it is determined whether or not the arrangement evaluation value is the maximum so far. If it is not the maximum, the arrangement position of the water pressure gauge is changed in the process S407, and the area calculation is performed again. When the arrangement evaluation value becomes the maximum, the water pressure gauge arrangement position and the arrangement evaluation value are returned in the process S408, and the process ends.

As described above, the water pressure gauge placement position search unit 103 assumes a plurality of patterns of water pressure gauge placement positions under the conditions of the given water pressure count and target accuracy, and determines the water pressure gauge placement position having the highest placement evaluation value. Extract.

Ideally, the pattern of the assumed water pressure gauge arrangement position covers all possibilities, but the number of patterns may be limited in advance to shorten the processing time. In that case, the condition of the process S406 may include "Is the number of times the arrangement position changed is the upper limit?" In the OR condition. Alternatively, a desired threshold value may be set for the placement evaluation value, and the condition of the process S406 may be "is the placement evaluation value equal to or greater than the threshold value?".

<Processing of area calculation unit (first half)>
FIG. 5 is a flowchart illustrating the process S404 performed by the area calculation unit 104. The area calculation unit 104 calculates the area configuration based on the target accuracy given by the water pressure gauge placement position search unit 103 and the water pressure gauge placement position (and the type of the water pressure gauge at each placement position).

In the process S501, the water pressure gauge placement position and the target accuracy are input from the water pressure gauge placement position search unit 103, and the subsequent processes are started.

In the process S502, the water pressure change amount calculation unit 105 is executed with the set target accuracy. The water pressure change amount calculation unit 105 comprehensively calculates the water pressure change amount at other places when there is a leak of target accuracy at each place in the water distribution pipe network.

<Processing of water pressure change amount calculation unit>
FIG. 6 describes the concept of the process performed by the water pressure change amount calculation unit 105. For example, as shown in FIG. 6A, points A, B, C, D, E, and F are defined at the nodes of the pipe network distributed from the water storage tank 601. The water pressure change amount calculation unit 105 calculates what kind of water pressure change occurs in the pipe network when water leakage with the target accuracy occurs at each point.

FIG. 6B is a table showing the relationship between the leak position and the amount of change in water pressure at each node. For example, the target accuracy and the amount of water leakage ^{50m 3 / h, A, B} , C, D, E, if leakage of ^{50 m} 3 / h occurs at each point of F, A, B, C, D, E, F The amount of change in water pressure at each point is as shown in FIG. 6B. For example, ^{when a water leak of 50 m 3} / h occurs at point A, the amount of change in water pressure at point B is minus 0.4 m (meter of water column), and the amount of change in water pressure at point C is minus 0.1 m.

Such a pressure change due to water leakage can be obtained by the water pressure change amount calculation unit 105 by the pipe network calculation performed by the pipe network calculation unit 106 using the data of the pipe network model database 107. At this time, the calculation burden can be reduced by selecting each point representing the location of the water pressure gauge and the location of water leakage, such as A, B, C, D, E, and F, from the coordinates set in advance in the simulation. .. The selection of coordinates is arbitrary, but in this embodiment, such points are selected from the nodes in the pipe network.

FIG. 7 is a flowchart illustrating the process S502 performed by the water pressure change amount calculation unit 105. The start trigger is when the target accuracy is input from the area calculation unit 104. Here, we calculate how the water pressure of the entire pipe network changes when water leakage occurs at each node in the pipe network with the target accuracy.

In the process S701, the target accuracy from the area calculation unit 104 is acquired. For example, the amount of water leakage is 50 m ³ / h.

In the process S702, the data of the pipe network model is acquired from the pipe network model database 107.

In the process S703, the pipe network calculation unit 106 is made to execute the pipe network calculation, and the calculation result S1 in a state where there is no water leakage, that is, there is no water leakage (normal time) is obtained. The calculation result S1 includes the normal water pressure value at each node in the pipe network. The result S1 is stored in the storage device.

In the process S704, one node in the pipe network is selected.

In the process S705, the selected node is assigned a leak with a ^{target accuracy (for example, 50 m 3 / h).} Let S2 be the result of the pipe network calculation in this state. The result S2 is also stored in the storage device.

In the treatment S706, S1 and S2 are compared, and how the water pressure changes in the entire pipe network due to the water leakage is recorded.

In the process S707, it is determined whether or not the simulation has been executed at all the nodes. If there are uncalculated nodes, one of them is selected in process S708 and the simulation is executed. This is performed at each node, and finally, in the process S709, the total result of the water pressure change amount at all the nodes when water leakage occurs at each node in the pipe network is totaled and returned to the area calculation unit 104. The aggregation result can be, for example, in the form of a table as shown in FIG. 6B.

It should be noted that the water leakage can be set to all nodes or nodes limited by some method (only nodes in demand, other user-specified nodes, etc.). In addition, the amount of change in water pressure may be totaled for all nodes or limited nodes.

The specific method for calculating the water pressure is generally performed as a pipe network calculation using a pipe network model, and since there is an accumulation of past technologies such as Patent Document 1, the explanation is omitted.
As described above, the water pressure change amount calculation unit 105 calculates the total result of the water pressure change amount at each node as shown in FIG. 6B for each target accuracy.

<Processing of area calculation unit (second half)>
Subsequently, the processing of the area calculation unit 104 will be described with reference to FIG. In the treatment S503 or later, the water pressure of each water pressure gauge is based on the total result of the water pressure change amount at all the nodes obtained from the water pressure change amount calculation unit 105 and the water pressure gauge specification obtained from the water pressure gauge specification database 108. Calculate the area where the meter can detect water leakage according to the target accuracy. This is calculated from the amount of change in water pressure based on the target accuracy and the amount of significant change in water pressure based on the specifications of the installed water pressure gauge.

A specific description will be given with reference to FIG. 5 again.
In the process S503, one water pressure gauge to be calculated in the area is selected from the water pressure gauge arrangement position arranged and input in the process S403.

In the process S504, the specifications of the selected water pressure gauge are acquired from the water pressure gauge specification database 108.

In the process S505, a significant amount of change in water pressure in the selected water pressure gauge is calculated. Since the water pressure gauge has a measurement error, even if the water pressure changes due to water leakage, it is not always possible to measure it. A significant amount of change in water pressure means that if the amount of change in water pressure exceeds that value, it can be measured without being buried in an error. The significant amount of change in water pressure can basically be determined from the specifications of the water pressure gauge. For example, the measurement error, the number of measurements, and the scale width can be obtained from the water pressure gauge specifications. Usually, the measurement error and the scale width can be calculated from the span based on the accuracy grade in the hydraulic pressure gauge specification database 108. Alternatively, or in addition to the accuracy grade, the direct measurement error and scale width may be stored in the hydraulic pressure gauge specification database 108.

The method of determining the significant water pressure change amount is not particularly limited, but for example, the significant water pressure change amount obtained by experiments or simulations is stored as data associated with the water pressure gauge in advance in association with the accuracy grade. You can leave it.

When the system side obtains a significant amount of change in water pressure based on the specifications, it can be calculated with high accuracy based on the water pressure gauge specifications and statistical tests. As the statistical test, for example, a known t-test can be used. When the t-test formula is used, the degree of freedom can be calculated from the number of measurements, the standard deviation can be calculated from the measurement error, and the amount of change in water pressure that becomes significant can be calculated by the statistical test.

In the treatment S506, the area is determined based on the significant amount of change in water pressure and the amount of change in water pressure in the pipe network.

In the process S507, it is determined whether or not the area calculation is completed for all the water pressure gauges at the water pressure gauge arrangement positions input in the process S501. If it is not completed, one untreated water pressure gauge is selected in the treatment S508. If it is completed, the area calculation result is totaled in the process S509 and returned to the water pressure gauge placement position search unit 103.

The concept of processing of the area calculation unit will be described with reference to FIG. FIG. 8A shows a case where the water pressure gauge at the node A is selected in the treatment S503 in the same water pipe network as in FIG. In the treatment S504, the specifications of the water pressure gauge are acquired, and in the treatment S504, a significant amount of change in water pressure is obtained. In the example of FIG. 8, the significant amount of change in water pressure was set to plus or minus 0.2 m or more.

In the process S506, the area is calculated from the given water pressure gauge arrangement position, the water pressure gauge specification, the target accuracy, and the amount of change in water pressure based on the target accuracy. Therefore, first, the calculation result of the water pressure change amount with respect to the target accuracy is acquired from the water pressure change amount calculation unit 105. This data is, for example, the data shown in FIG. 6B.

FIG. 8B is a table diagram showing the relationship between the water leakage position and the amount of change in water pressure at each node and the range in which the amount of change in water pressure with respect to the target accuracy can be detected, and the content is the same as the data in FIG. 6B. As shown in FIG. 8B, when ^{water leakage with a target accuracy of 50 m 3} / h occurs at each of the nodes A, B, and C, the amount of change in water pressure at the node A is -0.7 m, -0.5 m, and -0.1 m, respectively. Is. Therefore, it can be seen that the water pressure gauge at node A, which can detect a change in water pressure of plus or minus 0.2 m, can ^{detect water leakage at 50 m 3} / h up to node B. Therefore, the water pressure gauge at the node A can set the range of the area 801 as the measurement range, that is, the area. Therefore, as shown in FIG. 8A, the nodes A and B having a significant change in water pressure or more are extracted, and the node group is set as the area 801 in charge of the water pressure gauge arranged at the node A.

By performing the above processing on all the set number of water pressure gauges, the area of each water pressure gauge can be determined.

In FIG. 8, a water pressure gauge is arranged at the node A, and a water leak with a target accuracy or higher that occurs in the area 801 of the water pressure gauge can be detected by the water pressure gauge at the node A. On the contrary, the detection of the water leakage smaller than the target accuracy generated in the area 801 cannot be guaranteed by the water pressure gauge at the node A. Further, the water pressure gauge at the node A does not guarantee the detection of water leakage outside the area 801 regardless of the amount.

If the target accuracy is small, the area will be small because water leaks that occur far from the water pressure gauge cannot be detected. On the other hand, if the target accuracy is large, the range of influence of the water pressure change due to water leakage will be large, and the area will also be large. Therefore, when estimating a smaller leak (small target accuracy), it is not possible to cover the entire pipe network without installing many water pressure gauges. However, smaller leaks can be estimated in each area instead. On the other hand, when estimating a large leak, the number of water pressure gauges does not have to be so large. However, instead, it becomes difficult to estimate small leaks in each area. Therefore, there is a trade-off relationship between target accuracy and water pressure counting.

<Placement evaluation value>
An example of the placement evaluation value calculated by the water pressure gauge placement position search unit 103 in the process S405 (FIG. 4) will be described. In this embodiment, the arrangement evaluation value is set to be higher as the water pressure gauge arrangement covers the entire pipe network with an area and the amount of change in water pressure between the areas is the same and there is less overlap.

The meaning of the arrangement evaluation value will be described with reference to FIG. It is assumed that there are two water pressure gauges S1 and S2 with a target accuracy of 50 m ³ / h and a significant change in water pressure of 0.2 m, and they are installed at nodes A and D as shown in FIG. 9A. Further, the leak position and the water pressure change amount at each node are calculated by the water pressure change amount calculation unit 105, and are as shown in FIG. 9B.

Focusing on the water pressure gauges S1 and S2, the area calculation unit 104 calculates that the area of the water pressure gauge S1 is the area 901 and the area of the water pressure gauge S2 is the area 902, as shown in FIG. 9A.

Looking at FIG. 9B, ^{when a water leak of 50 m 3} / h occurs at the node A, the amount of change in water pressure in the water pressure gauge S1 is -0.7 and the amount of change in water pressure in the water pressure gauge S2 is -0.0. , It is possible to determine that water leakage has occurred in the area of the water pressure gauge S1. ^{Similarly, when a water leak of 50 m 3} / h occurs at node C, the amount of change in water pressure in the water pressure gauge S1 is -0.3, and the amount of change in water pressure in the water pressure gauge S2 is -0.8. It can be determined that the possibility of water leakage occurring in the area of S2 is higher. By enabling such discrimination, it is possible to limit the area where detailed leak investigation is performed, and it is possible to reduce maintenance costs.

^{However, when a water leak of 50 m 3} / h occurs at the node B, the amount of change in water pressure in the water pressure gauge S1 is -0.5, and the amount of change in water pressure in the water pressure gauge S2 is -0.5, which is the same. In such a state, it is not possible to determine in which area the leak occurs, and a detailed leak survey must be conducted for the two areas.

Therefore, in order to eliminate blind spots, the first condition of the water pressure gauge arrangement is that the entire pipe network can be covered by the area as much as possible, but the second condition is that the areas do not overlap as much as possible. In the second condition, it is particularly desirable to avoid that a leak point is included in the area of the two water pressure gauges and that the leak is measured by the two water pressure gauges as approximately the same water pressure change. This is because, in such a state, it is not possible to determine in which area the leak occurs, and a detailed leak survey must be conducted for the two areas.

As a specific example, the placement evaluation value f (x, m) (objective function) used in the water pressure gauge placement position search unit can be calculated as follows.

f (x, m) = {(Coverage (x, m) --Overlap (x, m)) / AllNodes (m)} ・ E (x, m)
here,
x: Combination of water pressure gauge placement positions
m: Pipe network model
Coverage: Area pipe network coverage
Overlap: Area overlap
AllNodes: Total number of nodes in the target tube network model
E: Evaluation function tailored to other purposes

Here, as the pipe network coverage of the area, for example, the total number of nodes belonging to any area can be used. As the degree of overlap of the areas, for example, the total number of nodes belonging to a plurality of areas and the amount of change in water pressure due to water leakage generated at the nodes is the same at a plurality of water pressure gauge placement positions can be used. .. The same degree can be defined as that the difference is equal to or less than a predetermined threshold value, and the user can determine what kind of value the difference should be on the empirical side.

The evaluation function E is optional and may be set to E = 1. In this case, the higher the evaluation value is, the more the area covers the entire pipe network and the water pressure gauge arrangement is such that the amount of change in water pressure between the areas is the same and there is little overlap.

It is also possible to use E to add weights according to the purpose. For example, if you want the size of each area to be the same, set E as follows.
E (x, m) = w ・ (1 / area_size_variance (x, m))
area_size_variance is the variance of the size of each area (for example, the extension of the pipeline in the area), and w is an appropriate weighting factor.

Another example of the evaluation function E is the evaluation function that minimizes the installation cost. This can be defined as the reciprocal of the total price of the water pressure gauges to be installed. Alternatively, a constraint condition may be set on the size of the area (pipeline extension). For this purpose, in the process of the area calculation unit 104, when the size of the area exceeds the specified value, a process of excluding the arrangement of the water pressure gauge may be added.

In the process S405 (FIG. 4), the water pressure gauge arrangement position search unit 103 calculates the arrangement evaluation values for various arrangements of the water pressure gauges under the conditions of the water pressure count and the target accuracy set in the process 401. Then, in the loop of the process S404 to the process S407, the water pressure gauge arrangement that maximizes the arrangement evaluation value is searched. The search result is sent to the water pressure gauge arrangement index adjustment / calculation unit 102, and is acquired in the process S305 (FIG. 3).

The water pressure gauge placement index adjustment / calculation unit 102 searches for the target accuracy (and water pressure gauge placement) at which the placement evaluation value is maximized in the loop of processing S304 to processing S307 under the conditions of the water pressure count set in the processing 302. .. The search result is saved as the water pressure gauge placement result database 109.

In the above example, an example of the placement evaluation value for reducing the blind spot of water leakage and reducing the labor of water leakage investigation is shown. However, an arbitrary placement evaluation value may be set from another viewpoint. For example, only one of Coverage (x, m) or Overlap (x, m) may be used as the placement evaluation value. In addition, the placement evaluation value may be determined from other viewpoints such as cost. In this embodiment, the system can present an area configuration according to the set criteria of the placement evaluation value from among the randomly generated area configurations.

<Water pressure gauge placement result database>
FIG. 10 is a table diagram showing an example of the data format of the water pressure gauge arrangement result database 109. The water pressure gauge placement result database 109 stores the calculation results of the water pressure gauge placement index adjustment / calculation unit 102 and the water pressure gauge placement position search unit 103. In the example of FIG. 10, the database includes two tables, the water pressure gauge placement result information 1001 and the water pressure gauge placement position information 1002, but they may be combined into one table or divided into three or more associated tables. Is also good.

The water pressure gauge placement result information 1001 holds a calculation result (target accuracy, water pressure gauge placement position, placement evaluation value) for a certain water pressure count. The left side of the table is the attribute name, and the right side is the attribute value. The attribute value is an example, and items can be omitted or added.

In the example of FIG. 10, the water pressure gauge arrangement result information 1001 shows the data of "3" water pressure counts, but it is decided that the water pressure counts 1 to the maximum number that can be installed have the same data for each number. Become. Further, as the target accuracy, the target accuracy that satisfies the condition of the process S306 (FIG. 3) and is the maximum of the arrangement evaluation value in the set water pressure count is stored. Then, the water pressure gauge placement position at that time is stored in the water pressure gauge placement position information 1002 identified by "R_1". The arrangement evaluation value is the maximum arrangement evaluation value in the set water pressure count that satisfies the condition of the process S306.

The water pressure gauge placement position information 1002 can be called by the water pressure gauge placement position ID that identifies the table. The water pressure gauge placement position information 1002 holds which water pressure gauge is placed at which position in the pipe network. Therefore, a set of the arrangement node ID which is the arrangement position of the water pressure gauge and the arrangement water pressure gauge ID which identifies the water pressure gauge arranged there is stored. In addition, the area range that each water pressure gauge is in charge of is defined by the node ID. In the example of FIG. 10, three sets of data are stored in the water pressure gauge arrangement position information 1002. The length of the table of the water pressure gauge arrangement position information 1002 changes depending on the water pressure count.

<Calculation result display screen>
FIG. 11 is a plan view showing an example of a calculation result display screen of the water pressure gauge arrangement position. This screen is generated by the result aggregation / screen output unit 101, displayed on an output device 111 such as a monitor screen, and presented to the user 112.

The target pipe network drawing, the water pressure gauge arrangement position, and the area configuration corresponding to each water pressure gauge are displayed on the screen 1101. This display data can be generated based on the pipe network model stored in the pipe network model database 107 and the water pressure gauge arrangement and area range information stored in the water pressure gauge arrangement result database. The displayed water pressure gauge placement position and area configuration change depending on the content selected by the user.

A graph of the water pressure gauge arrangement result is displayed on the screen 1102. The figure is an example, and the change in the target accuracy and the placement evaluation value with respect to the water pressure count is displayed. This display data can be generated based on the contents of the water pressure gauge arrangement result database 109. In the example of FIG. 11, the maximum value of the arrangement evaluation value and the target accuracy at that time are shown on the vertical axis corresponding to the horizontal axis which is the water pressure count to be arranged.

When the desired water pressure count, target accuracy, or arrangement evaluation value is selected by the marker 1103, the corresponding water pressure gauge arrangement position and area configuration are displayed on the screen 1101. In the example of FIG. 11, the water pressure count “2” is selected.

The screen 1104 is a setting screen for changing the graph display contents of the screen 1102. You can select the contents of the horizontal axis of the entire graph and the vertical axis of the upper and lower graphs. In the example, the water pressure count is specified on the horizontal axis, the target accuracy is specified on the vertical axis of the upper graph, and the placement evaluation value is specified on the vertical axis of the lower graph. Two or more display contents can be specified on the vertical axis of the upper graph and the lower graph, and a graph with two or more axes can be created. Using the data of the available database, the vertical axis and horizontal axis display the water pressure count, target accuracy, placement evaluation value, water pressure gauge placement cost, average of the size of each area (pipeline extension), etc. You may.

As mentioned earlier, there is a trade-off relationship between target accuracy and water pressure counting. If the target accuracy is small, even a small leak can be estimated, but many water pressure gauges are required and the cost increases. The graph shown on the screen 1102 allows the user to grasp this relationship. Further, by displaying the arrangement evaluation values together, an effective arrangement can be determined according to the needs, and a desired arrangement can be selected.

As described above, in this embodiment, it is possible to present to the user an appropriate arrangement of water pressure gauges for each number of water pressure gauges to be installed. Therefore, the available resources can be effectively utilized, and the cost of water leakage maintenance work can be reduced.

In the first embodiment, a case where a water pressure gauge is newly arranged to construct an area has been described as an example. However, the present invention is similarly effective when the existing water pressure gauge is used and a new water pressure gauge is added.

In this case, the user may be able to specify the existing water pressure gauge placement position and the area configuration. For example, the position and area of the existing water pressure gauge may be set in advance, and the additional water pressure gauge may be processed in the same manner as in the first embodiment.

The changes will be described with reference to FIGS. 3 and 4. Specifically, in the process S301 (FIG. 3) of the water pressure gauge arrangement index adjustment / calculation unit 102, the number of water pressure gauges specified (existing water pressure count +1) is set instead of 1 in the initialization of the water pressure count. .. Then, in the process S403 (FIG. 4) of the water pressure gauge placement position search unit 103, when the water pressure gauges are randomly placed, the designated water pressure gauge (existing water pressure gauge) is placed at the previously designated position. , Place the rest randomly. Further, the maximum number of treated water pressure gauges that can be installed in S309 (FIG. 3) is set to (existing water pressure count + water pressure count that can be additionally installed).
By doing so, it is possible to present an effective area configuration while using the existing equipment.

In Example 1, the water pressure gauge arrangement is extracted because it is possible to estimate the water leakage with the target accuracy and the arrangement evaluation value is excellent, but the future water leakage amount, that is, the water leakage risk is not considered. First, the merits of considering the risk of water leakage will be explained.

FIG. 12 is a table diagram showing an example of water leakage risk data 1201 summarizing future water leakage risks at each node of the water distribution pipe network. The future leakage risk is expressed in units of ^{future leakage amount (m 3} / year) for each node A, B, C ... Leakage risk is not uniform and can be biased from place to place. Areas with a high risk of water leakage are, for example, aging pipes and pipes with a harsh usage environment. FIG. 12 is an example in which such a water leakage risk is quantified and shown. In this example, water leakage risk node C and D are 20 m ³ / year, higher than 5 m ³ / year other nodes.

In FIG. 13, an example of an area configuration in consideration of the water leakage risk will be described with reference to the water leakage risk example of FIG. According to the first embodiment, it is possible to present a method of arranging a water pressure gauge with less overlap of areas while covering the entire pipe network with an area. For example, when the size of each area is made similar by using the evaluation function E (x) described above, the area configuration as shown in FIG. 13A is presented. The table of FIG. 13A shows the future leakage amount of each area. The future leak amount of the area is the total value of the future leak amount of the nodes included in the area. According to the example of FIG. 13A, the future leakage amount of the area A is 5 + 5 + 20 = 30, and the future leakage amount of the area B is 20 + 5 + 5 = 30.

However, one of the purposes of estimating the amount of water leakage for each area is to estimate the area with a large amount of water leakage, identify the water leakage survey, and improve the efficiency to reduce the cost of dealing with water leakage. In that respect, in the area configuration method of FIG. 13A, there is a possibility that the same amount of water leakage will occur in both areas A and B in the future. Therefore, both areas A and B must conduct a leak survey at the same ratio, and the survey range cannot be narrowed down to a specific area.

Therefore, in consideration of future water leakage risk, as shown in FIG. 13B, the future water leakage risk for each area is intentionally biased. According to the example of FIG. 13B, the future leakage amount of the area A is 5 + 5 + 20 + 20 = 50, and the future leakage amount of the area B is 5 + 5 = 10. As a result, the area A is wider than the area configuration of FIG. 13A, but the risk of water leakage is larger than that of the area B. Therefore, in response to future leak investigations, efforts can be concentrated on Area A.

By dividing the area into three areas, the A and B nodes are designated as area A, the C and D nodes are designated as area B, and the E and F nodes are designated as area C. It is also possible to narrow down the leak investigation range.

FIG. 14 is an overall configuration diagram of the water pressure gauge arrangement support system according to the third embodiment. The same components as those in the example of FIG. 1 are designated by the same reference numerals, and the description thereof will be omitted. The water pressure gauge placement support system 100a of the third embodiment includes a pipeline asset database 1401 that stores pipeline asset information. Then, the water pressure gauge placement position search unit 103 can consider the risk of water leakage based on the pipeline asset information.

FIG. 15 shows a configuration example of the pipeline asset database 1401. The pipeline asset database 1401 is a database that stores information for calculating the risk of water leakage, such as the number of years of burial of the pipeline and the material. The way to read the database is that the left side of the table is the attribute name and the right side is the attribute value, and data is stored for each pipeline ID that specifies the pipeline. For example, the diameter, extension, flow velocity coefficient, burial age, pipe material, etc. of the pipeline. The attribute value is an example. In reality, it is assumed that there are a plurality of attribute value columns according to the number of pipelines.

The water leakage risk in each area is calculated from the pipeline asset information as follows, for example.
First, the risk of water leakage accident [cases / km / year] for each pipeline is calculated.
risk (t) = at ^ b

Here, t is the number of years of burial of the target pipeline, and a and b are constants determined by the material and diameter of the pipe. Use known constants. Alternatively, it may be calculated from the leak repair record. For example, first, the pipelines are grouped according to the pipe material and diameter, and then the actual value of water leakage accidents [cases / km / year] by the number of years of burial is calculated for each group. Finally, a constant can be obtained by performing regression analysis or the like based on the actual value.

Next, the water leakage risk [(m ^ 3 / h) / year] for each pipeline is calculated.
leak_risk (t) = risk (t) L p ^ (1/2)
Here, L is the length of the pipeline [km], and p is the average water pressure applied to the pipeline [m].

Then, the water leakage risk of the pipeline is totaled in each area, and the water leakage risk of the area is calculated.
The following equation is introduced in E (x) with the placement evaluation value (objective function) considering the risk of water leakage.
E (x) = w ・ leak_risk_variance (x)

Here, Leak_risk_variance is the variance of the risk of water leakage between each area, and w is the weighting coefficient. In this way, it is possible to preferentially select the water pressure gauge arrangement position and the area configuration in which the variation in the water leakage risk for each area becomes large.

In the above example, the system calculates the leakage risk of each pipeline from the pipeline asset database 1401. As another method, water leakage risk data 1201 (FIG. 12) may be created in advance and used as an independent database or included in the data of the pipe network model database 107 for calculation.

FIG. 16 is a flowchart illustrating the process S304 performed by the water pressure gauge arrangement position search unit 103 of FIG. The same reference numerals are given to the same configurations as those of FIG. 4, and the description thereof will be omitted.

In the third embodiment, the water leakage risk of each pipeline is calculated from the pipeline asset database 1401 in the process S1601. Alternatively, if water leakage risk data 1201 (FIG. 12) is prepared, it may be used directly.

In the process S405a, the arrangement evaluation value is calculated for the area configuration. In the calculation of the placement evaluation value, as described above, the evaluation function E is a function having the variance of the water leakage risk in each area as a term.

In the third embodiment, the area configuration can be extracted and presented so that the variation in the water leakage risk for each area becomes large. At this time, the result totaling / screen output unit 101 may perform a numerical value or display indicating a water leakage risk corresponding to each area of the screen 1101 (FIG. 11) displayed on the output device.

In the above-described embodiment, for example, a user who uses a water leakage estimation technique using hydraulic analysis and measurement data of a water pressure gauge as described in Patent Document 1 is presented with a water pressure gauge placement position and an area configuration method. Can be done. At that time, the model simulating the pipe network and the specifications of the water pressure gauge to be installed are input, and the number of given water pressure gauges, the target accuracy to determine the shape and size of the area, and the water pressure gauge based on the above input. Is optimally arranged, and a calculation unit that returns the arrangement position, area composition, and an index for evaluating them is used. In practical use, the relationship between the number of water pressure gauges and the target accuracy is presented to the user by inputting multiple combinations of the number of water pressure gauges and the target accuracy into the calculation unit and totaling the obtained results, and the water pressure determined by the user. Based on the number of meters and the target accuracy, the arrangement position of the water pressure gauge and the area configuration method can be presented.

The present invention is not limited to the above-described embodiment, and includes various modifications. For example, it is possible to replace a part of the configuration of one embodiment with the configuration of another embodiment, and it is possible to add the configuration of another embodiment to the configuration of one embodiment. Further, it is possible to add / delete / replace the configurations of other examples with respect to a part of the configurations of each embodiment.

Water pressure gauge placement support system 100, result aggregation / screen output unit 101, water pressure gauge placement index adjustment / calculation unit 102, water pressure gauge placement position search unit 103, area calculation unit 104, water pressure change amount calculation unit 105, pipe network calculation unit 106 , Pipe network model database 107, water pressure gauge specification database 108, water pressure gauge placement result database 109, input device 110, output device 111

Claims (15)

It is a water pressure gauge placement support method that supports the placement of water pressure gauges in a pipe network using an information processing device.
Using the pipe network model data simulating the pipe network and the water pressure gauge specification data including the specifications of the water pressure gauge,
Based on the pipe network model data and the water pressure gauge specification data for each of a plurality of conditions consisting of a combination of the water pressure count and the target accuracy, the position of the water pressure gauge on the pipe network and the area corresponding to the placement position The first process of calculating multiple area configurations, consisting of arrangements,
The second process of calculating the arrangement evaluation value for each of the plurality of area configurations calculated in the first process.
Based on the arrangement evaluation value, a third process of extracting candidates to be presented for each water pressure count from the plurality of area configurations calculated in the first process is performed.
Water pressure gauge placement support method. A fourth process of presenting the water pressure count and the target accuracy to the user, which corresponds to the candidate to be presented extracted in the third process, is performed.
The method for supporting the placement of a water pressure gauge according to claim 1. A fifth process of presenting the area configuration to the user, which corresponds to the water pressure count or target accuracy selected by the user with respect to the presentation of the fourth process, is performed.
The method for supporting the placement of a water pressure gauge according to claim 2. The arrangement evaluation value is calculated using two indexes, a pipe network coverage degree, which is the degree to which the area covers the pipe network, and an area overlap degree, which is the degree to which the areas overlap each other.
The method for supporting the placement of a water pressure gauge according to claim 1. In the third process,
For each water pressure count, the area configuration with the maximum arrangement evaluation value is extracted as a candidate.
The method for supporting the placement of a water pressure gauge according to claim 1. In the first process,
Based on the pipe network model data, when a water leak corresponding to the target accuracy occurs at a predetermined water leakage position in the pipe network, the change in water pressure in the pipe network is simulated, and the water leakage position and the pipe network Water pressure change amount calculation process to obtain the relational data of water pressure change amount,
Based on the water pressure gauge specification data and the relational data, an area calculation process for calculating the arrangement of the area corresponding to the arrangement position is performed for each arrangement position of the water pressure gauge on the pipe network.
The method for supporting the placement of a water pressure gauge according to claim 1. When the placement evaluation value is expressed by the objective function f (x, m),
f (x, m) = {(Coverage (x, m) --Overlap (x, m)) / AllNodes (m)} ・ E (x, m)
here,
x: Combination of water pressure gauge placement positions
m: Pipe network model based on pipe network model data
Coverage: Area pipe network coverage
Overlap: Area overlap
AllNodes: Total number of nodes in the target pipeline model
E: Can be expressed as an evaluation function,
The method for supporting the placement of a water pressure gauge according to claim 1. The pipe network coverage of the area is the number of nodes of the pipe network model belonging to any area.
The degree of overlap of the areas is a node of a pipe network model belonging to a plurality of areas, and a node in which the difference in the amount of change in water pressure at a plurality of water pressure gauge placement positions due to water leakage generated at the node is equal to or less than a predetermined threshold value. Is the total number of
The method for supporting the placement of a water pressure gauge according to claim 7. The evaluation function is
E (x, m) = 1
Is,
The method for supporting the placement of a water pressure gauge according to claim 7. The evaluation function is
E (x, m) = w ・ (1 / area_size_variance (x, m))
And
area_size_variance is the variance of the size of each area, w is the weighting factor,
The method for supporting the placement of a water pressure gauge according to claim 7. The evaluation function is
E (x) = w ・ leak_risk_variance (x, m)
And
Leak_risk_variance is the variance of the leak risk in each area, w is the weighting factor,
The method for supporting the placement of a water pressure gauge according to claim 7. The risk of water leakage is
Calculated from data in a pipeline asset database that stores at least one of the pipe burial years and materials of the pipeline model
Alternatively, it is obtained from the leak risk data in which the future leak risk at each node of the pipe network model is quantified and stored in advance.
The method for supporting the arrangement of a water pressure gauge according to claim 11. A pipe network model database that stores pipe network model data that simulates a pipe network, and
A water pressure gauge specification database that stores water pressure gauge specification data including water pressure gauge specifications, and
Water pressure gauge placement index adjustment / calculation unit and
Input device and
Output device and
With
The water pressure gauge placement index adjustment / calculation unit
Based on the pipe network model data and the water pressure gauge specification data for each of a plurality of conditions consisting of a combination of the water pressure count and the target accuracy, the position of the water pressure gauge on the pipe network and the area corresponding to the placement position Calculate multiple area configurations consisting of arrangements,
The placement evaluation value is calculated for each of the calculated multiple area configurations,
From the plurality of area configurations calculated based on the arrangement evaluation value, candidates to be presented are extracted for each water pressure count.
Water pressure gauge placement support system. In addition, it is equipped with a result aggregation / screen output section.
The water pressure gauge placement index adjustment / calculation unit
For each water pressure count, the presentation data in which the target accuracy and the placement evaluation are associated with the area configuration that is the candidate to be presented is sent to the result aggregation / screen output unit.
The result aggregation / screen output unit
A display screen is displayed on the output device based on the presented data.
The water pressure gauge placement support system according to claim 13. The arrangement evaluation value is calculated using two indexes, that is, the degree of pipe network coverage, which is the degree to which the area covers the pipe network, and the degree of overlap of the areas, which is the degree to which the areas overlap each other.
In the extraction based on the placement evaluation value,
The area having a large pipe network coverage, which is the degree to which the area covers the pipe network, is more easily extracted than the one having a small pipe network coverage, and
Areas with a small degree of overlap are easier to extract than those with a large degree of overlap.
The water pressure gauge placement support system according to claim 13.

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