JP7249872B2 - Pipe network analysis method, pipe network analysis program - Google Patents

Description

The present invention relates to a pipe network analysis method and a pipe network analysis program.

Fluid transport pipes such as water pipes and gas pipes installed in urban areas form a pipe network in which pipes are connected in a network at a plurality of connection points within a predetermined area. Within the pipe network, the state of the pipe network, such as flow rate and pressure, changes due to fluctuations in the demand for the transport fluid. The state of the pipe network also changes according to changes in the situation.

The state of the pipe network is managed by fluid suppliers (local governments, gas suppliers, etc.) for each specific area. In order to ensure a stable supply of transport fluid to the end of demand, it is necessary to periodically monitor the state of the pipe network. need to be understood quickly.

The state of the pipe network is grasped by the pipe network analysis by computer simulation. In the pipe network analysis, taking water supply as an example, a pipe network model is created from nodes that abstract distribution reservoirs, outflow points, pumps, pressure reducing valves, and pipe connection points, and the pipes that connect them. Based on pipe network data such as facility information stored in a database and observation information sent online such as the current pond water level and pipe flow rate, the current pipe network status (each node and the pipe between nodes) water pressure, flow rate, flow direction, etc.) in the channel. In this pipe network analysis, a loop selection method using a computer to select loops in a pipe network in which at least one supply source node and a plurality of nodes are connected by pipelines having resistance has been proposed (see below See Patent Document 1).

JP-A-8-129566

Due to the limited processing capacity of computers generally used by fluid suppliers, pipe network analysis requires a great deal of time for analysis processing when targeting large-scale pipe networks with many nodes. . For this reason, when it is desired to grasp changes in the state of the pipe network periodically or in an emergency, there arises a problem that analysis results cannot be obtained quickly.

In response to this, conventionally, main pipelines with large diameters are extracted from the entire pipeline network, and pipelines branching from the main pipelines with a diameter smaller than a set diameter are deleted. Attempts have been made to simplify the pipe network to shorten the analysis time, but even branch pipes with a small diameter may contain pipes with large flow rates, so these are unconditionally deleted. Then, there is a problem that good analysis accuracy cannot be secured.

The present invention has been proposed in order to deal with such problems. The challenge is to shorten the time required.

In order to solve such problems, the pipe network analysis method or the pipe network analysis program of the present invention has the following configuration.

A method for performing pipe network analysis or a program for causing a computer to execute pipe network analysis processing, comprising a process or step of extracting trunk pipelines having a set diameter or more from the entire pipe network of a specific area; Among the pipelines other than the pipelines, from the result of the overall pipeline network analysis performed in advance for the entire pipeline network, the pipelines whose inflow amount to the main pipeline is equal to or greater than the set flow rate are extracted up to the water distribution starting point. and a process or step of performing a trunk pipeline network analysis on a pipe network from which the trunk pipeline and pipelines other than the selected pipeline are deleted. do.

The present invention having such features can shorten the time required for analysis by simplifying the pipe network to be analyzed while ensuring a predetermined analysis accuracy in the pipe network analysis.

It is an explanatory view showing a system configuration example for causing a computer to perform pipe network analysis. It is an explanatory view showing the process (step) flow of the pipe network analysis method (pipe network analysis program) according to the embodiment of the present invention. FIG. 4 is an explanatory diagram showing a pipe network diagram to be subjected to the overall pipe network analysis; FIG. 2 is an explanatory diagram showing a model diagram of a pipe network to be subjected to pipe network analysis; FIG. 2 is an explanatory diagram showing a model diagram of a pipe network to be subjected to pipe network analysis; FIG. 2 is an explanatory diagram showing a model diagram of a pipe network to be subjected to pipe network analysis; FIG. 2 is an explanatory diagram showing a model diagram of a pipe network to be subjected to pipe network analysis; FIG. 2 is an explanatory diagram showing an example of a pipe network diagram that is the target of trunk pipe network analysis; FIG. 11 is an explanatory diagram for explaining aggregation of used nodes before and after pipeline deletion;

Embodiments of the present invention will be described below with reference to the drawings. In the following description, the same reference numerals in different figures denote portions having the same function, and duplication of description in each figure will be omitted as appropriate.

A pipe network analysis method according to an embodiment of the present invention is executed by a computer simulation system as shown in FIG. A computer 1 for pipe network analysis receives information necessary for pipe network analysis from a pipe network data database 2, which is facility information of an existing pipe network to be analyzed. Further, when the existing pipe network is to be updated/expanded, the corresponding information is input from the update/expansion information input means 3 . Furthermore, the current water level of the distribution reservoir, the flow rate of each pipeline, the demand amount at each demand destination, etc. are measured at each observation point 4 and the measured values are input to the computer 1 via the network 5 .

The computer 1 is installed with a program for performing pipe network analysis based on the input of the information described above. This program includes an overall pipe network analysis step S0 performed by a known analysis program, and steps S1 to S3 for executing the following processes. Each step is executed.

As for the steps, as shown in FIG. 2, a trunk pipeline extraction step S1, a selected pipeline setting step S2, and a trunk pipeline network analysis step S3 are provided in addition to the overall pipeline network analysis step S0 performed in advance.

In the previously performed overall pipe network analysis step S0, pipe network analysis is performed by a known method for the entire pipe network of the specific region. In this step, various information of the pipe network in the specific area to be analyzed is acquired from the database 2, and a pipe network diagram as shown in FIG. 3 is displayed. , flow rate, flow direction, etc. In FIG. 3, R indicates a distribution reservoir arranged in the pipe network, and P indicates a pump station arranged in the pipe network.

The trunk pipeline extraction step S1 extracts trunk pipelines having a set diameter or larger from the entire pipeline network. Here, paying attention to the diameter of the pipeline, a pipeline having a diameter equal to or larger than the set diameter is defined as a main pipeline, and a pipeline having a diameter smaller than the set diameter is defined as a pipeline other than the main pipeline. In the conventional trunk pipeline network analysis, only the trunk pipelines extracted here are targeted for analysis, and the time required for analysis can be shortened. The accuracy of the analysis was to be degraded.

On the other hand, in the embodiment of the present invention, the selected pipeline setting step S2 is provided after the main pipeline extraction step S1 to prevent the deterioration of the analysis accuracy. In this step S2, pipelines that satisfy a certain condition are selected from among the pipelines (having a smaller diameter than the set diameter) that were not extracted as trunk pipelines in the above-described trunk pipeline extraction step S1, and selected. Add it to the target of trunk pipeline network analysis. Pipes (selected pipelines) selected in step S2 are extracted from the result of the above-described overall pipeline network analysis step S0, pipelines having an inflow amount to the main pipeline that is equal to or greater than the set flow rate, up to the water distribution starting point. This is the selected pipeline.

4 to 6 show model diagrams of pipe networks to be subjected to pipe network analysis. In the figure, R1 is a water distribution starting point, and pipelines P1 and P2 are main pipelines connected to the water distribution starting point R1. Pipelines A to E are medium and small diameter pipes having a diameter smaller than the set diameter Ds, and are directly or indirectly connected to the main pipeline.

In such a pipeline network model, as shown in FIG. 4, when the inflow amount M of the pipeline A into the trunk pipeline is smaller than the set value (threshold value) Ms, all the pipelines A to E are deleted. The trunk pipeline network analysis in step S3 is performed only for trunk pipelines from which these have been deleted.

On the other hand, as shown in FIG. 5, when the inflow amount M of the pipeline A into the trunk pipeline is equal to or greater than the set value (threshold value) Ms, the pipeline extracted from the pipeline A to the water distribution starting point is selected. It becomes a pipeline and is removed from the pipeline to be deleted. In the case of FIG. 5, pipelines B to E are the pipes to be deleted, and the trunk pipeline network analysis in step S3 is performed for the trunk pipelines and pipeline A from which these have been deleted.

If it is desired to further improve the analysis accuracy, as shown in FIG. add pipeline B connected to pipeline A to the selected pipelines. In the case of FIG. 6, since the inflow amount M2 into the pipeline B is less than the set value (threshold) Ms2, the pipelines C to E are the pipelines to be deleted. The trunk pipe network analysis in step S3 is performed for the roads A and B.

The inflow amounts M, M1, and M2 here are the values obtained in the overall pipeline network analysis step S1, and the set diameter Ds for extracting the trunk pipeline and the set value Ms for setting the selected pipeline. , Ms1 and Ms2 can be arbitrarily set as input conditions at the time of analysis. Under the conditions of the inflow amounts M, M1, and M2 shown in FIG. 6, when the set diameter Ds for extracting the trunk pipeline is set to include the medium diameter D2 pipeline, as shown in FIG. As for the pipeline C and the pipeline D, the part of the medium-diameter pipe is excluded from the deletion target. In such a case, the flow rate of the deleted pipeline is set as a node at the ends of the undeleted portions of pipelines C and D.

By providing such a selection pipeline setting step S2, it is possible to automatically select the pipeline to be deleted in consideration of the result of the overall pipeline network analysis, thereby minimizing the influence on the analysis accuracy. However, the analysis time can be shortened.

FIG. 8 is an example of a pipeline network diagram in which pipelines other than the trunk pipeline extracted in step S1 and the selected pipeline set in step S2 are deleted from the pipeline network diagram of the entire area shown in FIG. , and the main pipeline network analysis step S3 is executed for such a pipeline network diagram.

In the main pipeline network analysis step S3, as shown in FIG. 9, when there are a plurality of user nodes in the pipeline to be deleted (for example, usage amounts N1, N2), the user node of the deleted pipeline are aggregated into one node, and the usage amount (N1+N2) is set at the branch position of the deleted pipe on the main pipeline or the selected pipeline. With such a setting, it is possible to set so that the consumption of the entire pipe network does not change before and after the deletion of the small-diameter pipes other than the selected pipe line.

1: computer, 2: database, 3: update/expansion information input means,
4: observation point, 5: network

Claims (3)

A program for causing a computer to execute pipe network analysis processing,
a step of extracting trunk pipelines having a diameter equal to or greater than a set diameter from the entire pipeline network of the specific area;
Among the pipelines other than the main pipeline, from the result of the overall pipeline network analysis performed in advance for the entire pipeline network, the pipeline whose inflow amount to the main pipeline is equal to or greater than the set flow rate to the water distribution starting point a step of extracting as a selected conduit;
A pipeline network analysis program comprising: performing a trunk pipeline network analysis on a pipeline network from which pipelines other than the trunk pipeline and the selected pipeline are deleted. 2. The pipeline network analysis program according to claim 1 , wherein pipelines having an inflow amount to said selected pipelines equal to or greater than a set flow rate are extracted up to a water distribution starting point and added to said selected pipelines. 3. The pipeline network analysis program according to claim 1, wherein the user nodes provided in the deleted pipeline are aggregated and the usage amount is set on the trunk pipeline or the selected pipeline.

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