WO2017199839A1 - 解析装置、解析方法、およびプログラムを記憶した記憶媒体 - Google Patents
解析装置、解析方法、およびプログラムを記憶した記憶媒体 Download PDFInfo
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- WO2017199839A1 WO2017199839A1 PCT/JP2017/017843 JP2017017843W WO2017199839A1 WO 2017199839 A1 WO2017199839 A1 WO 2017199839A1 JP 2017017843 W JP2017017843 W JP 2017017843W WO 2017199839 A1 WO2017199839 A1 WO 2017199839A1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/44—Processing the detected response signal, e.g. electronic circuits specially adapted therefor
- G01N29/4472—Mathematical theories or simulation
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- 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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/66—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters
- G01F1/666—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters by detecting noise and sounds generated by the flowing fluid
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/043—Analysing solids in the interior, e.g. by shear waves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/07—Analysing solids by measuring propagation velocity or propagation time of acoustic waves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/14—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object using acoustic emission techniques
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/44—Processing the detected response signal, e.g. electronic circuits specially adapted therefor
- G01N29/46—Processing the detected response signal, e.g. electronic circuits specially adapted therefor by spectral analysis, e.g. Fourier analysis or wavelet analysis
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/025—Change of phase or condition
- G01N2291/0258—Structural degradation, e.g. fatigue of composites, ageing of oils
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/028—Material parameters
- G01N2291/02854—Length, thickness
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/26—Scanned objects
- G01N2291/262—Linear objects
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/26—Scanned objects
- G01N2291/263—Surfaces
- G01N2291/2634—Surfaces cylindrical from outside
Definitions
- This disclosure relates to a technique for analyzing a state of a pipe network through which a fluid flows.
- Patent Documents 1 to 3 disclose techniques for obtaining knowledge about piping network or piping deterioration.
- Patent Document 1 discloses a technique for detecting clogging caused by deposits in a pipe.
- Patent Document 2 discloses a method of attaching a device that generates a shock wave to a water pipe, generating the shock wave, obtaining a propagation speed from the arrival time of the shock wave from upstream to downstream, and diagnosing deterioration from the propagation speed. .
- Patent Document 3 discloses a method for simulating the behavior of a fluid based on the three-dimensional arrangement data of piping, the data indicating the thinning of the piping, and the data indicating the behavior of the fluid flowing through the piping. A technique for obtaining thickness data is disclosed.
- Patent Document 2 The technique for diagnosing deterioration from the propagation speed of shock waves as disclosed in Patent Document 2 requires a special device for generating shock waves.
- the present invention has been made in view of the above problems, and an object of the present invention is to provide an apparatus that can acquire information on tube deterioration based on information that can be acquired by a simple method.
- An analysis apparatus includes: a determination unit that determines whether accuracy of a pipe network model based on information including a parameter whose value changes according to deterioration of a tube satisfies a predetermined condition; Includes deriving means for deriving information on the deterioration of the pipe based on the parameter when the predetermined condition is satisfied.
- An analysis method determines whether accuracy of a pipe network model based on information including a parameter whose value changes according to pipe deterioration satisfies a predetermined condition, and the accuracy is the predetermined When the above condition is satisfied, information on the deterioration of the pipe based on the parameter is derived.
- a program a computer, a determination process for determining whether the accuracy of a pipe network model based on information including a parameter whose value changes according to pipe deterioration satisfies a predetermined condition; When the accuracy satisfies the predetermined condition, a derivation process for deriving information related to deterioration of the pipe based on the parameter is executed.
- the present invention it is possible to acquire information related to tube deterioration based on information that can be acquired by a simple method.
- An analysis device is a system in which one or more components constituting the analysis device are realized by using one or more physical or logical information processing devices (physical computer, virtual computer, etc.). It may be configured.
- the object of analysis is a water pipe network that transports (distributes) water.
- the present invention described by taking this embodiment as an example is not limited to this, and can be applied to a pipe network through which any fluid other than water flows.
- the arbitrary fluid may be a liquid other than water or a gas such as natural gas.
- FIG. 1 is a block diagram showing a configuration of an analysis apparatus 11 according to the first embodiment of the present invention.
- the analysis device 11 is configured to be able to refer to the analysis model 20.
- the analysis model 20 is information representing a pipe network.
- the information representing the pipe network includes, for example, information such as connection relations, lengths, diameters, materials, and roughnesses of the pipes constituting the pipe network.
- Information on the material and roughness of the pipe may be expressed by, for example, a flow coefficient.
- the analysis model 20 may be information that is essentially equivalent to information representing a pipe network.
- the analysis model 20 may be information representing an electric circuit network imitating a pipe network.
- the analysis model 20 may be created in advance by a device (not shown) or may be created by a user, for example.
- the analysis model 20 is held by, for example, a storage device (not shown).
- the analysis model 20 may be held by a computer on which the analysis device 11 is mounted.
- the analysis device 11 includes an input / output unit 101, a transfer characteristic deriving unit 102, a calculating unit 103, a waveform comparing unit 105, a determining unit 106, a correcting unit 107, and a deriving unit 108.
- the input / output unit 101 exchanges data with an information processing apparatus (not shown) connected to the analysis apparatus 11.
- the input / output unit 101 may be connected to a storage medium that stores data.
- the input / output unit 101 may exchange data with the user of the analysis device 11.
- the input / output unit 101 may have an interface through which a user can write and browse data.
- the input / output unit 101 may be connected to an output device having a display function.
- the input / output unit 101 acquires the analysis model 20 from, for example, a storage device that stores the analysis model 20.
- the input / output unit 101 may acquire part or all of the analysis model 20 from the user through an input / output interface.
- the input / output unit 101 also exchanges data with each component of the analysis device 11.
- the input / output unit 101 sends information necessary for deriving a transfer characteristic (described later) to the transfer characteristic deriving unit 102.
- the input / output unit 101 sends information on the pipe network to be analyzed by the analysis device 11 to the transfer characteristic deriving unit 102.
- the pipe network to be analyzed is, for example, a part of the pipe network represented by the analysis model 20.
- the input / output unit 101 sends information on a part of the analysis model 20 to the transfer characteristic deriving unit 102 as information on a pipe network to be analyzed.
- the information on the pipe network to be analyzed includes designation of a point that defines the range to be analyzed (that is, the end point of the pipe network in the range).
- a point that defines a range to be analyzed is referred to as an “end point”.
- the input / output unit 101 sends an internal point designation within the range of the pipe network to be analyzed to the transfer characteristic deriving unit 102.
- the input / output unit 101 may acquire the information on the pipe network and the specification of the range to be analyzed and the internal points by, for example, input by a user who can refer to the analysis model 20. Alternatively, the input / output unit 101 may acquire the above information and the above designation by reading data stored in a storage device (not shown).
- FIG. 2 is a diagram conceptually showing a pipe network in a range to be analyzed.
- points 1, 2, and 4 are end points
- point 5 is an internal point.
- Point 3 is a branch point and is not directly involved in the various operations in this description.
- the input / output unit 101 sends the structure information of the pipe network to be analyzed to the transfer characteristic deriving unit 102.
- the structure information of the pipe network is used in the derivation of the transfer characteristic by the transfer characteristic derivation unit 102.
- the structure information of the pipe network is, for example, the connection relation, length, outer diameter, and flow coefficient of the pipes constituting the pipe network.
- the input / output unit 101 may extract the structure information of the pipe network from the analysis model 20 and send the extracted information to the transfer characteristic deriving unit 102.
- the information necessary for deriving the transfer characteristics includes information on parameters that change according to deterioration of the pipes constituting the pipe network.
- the deterioration of the pipe is, for example, a change in the wall thickness of the pipe.
- the thickness of the tube is the thickness of the members that make up the tube. That is, the thickness of the tube is the difference between the outer diameter and the inner diameter of the tube.
- a reduction in the thickness of the tube is particularly called thinning. The thinning occurs due to wear caused by the flow of fluid.
- the parameter that changes according to the deterioration of the pipe is, for example, a parameter that changes according to the thickness of the pipe.
- the parameter that changes in accordance with the thickness of the pipe is, for example, the speed of sound (hereinafter referred to as “sound speed”) transmitted through the fluid flowing through the pipe (in this embodiment, water).
- the speed of sound in other words, is the speed of propagation of pressure waves in a fluid flowing through a tube. If the speed of sound is “c”, “c” is expressed by the following equation (1), for example.
- ⁇ is the density of water
- E W is the volume elastic modulus of water (2.14 GN / m 2 at 15 ° C.)
- D is the inner diameter of the tube
- t is the wall thickness of the tube
- E S is the elastic coefficient of the tube
- ⁇ is the ratio at which elements (such as soil) other than the tube bear the internal pressure of the tube.
- the input / output unit 101 may send the value of the sound speed to the transfer characteristic deriving unit 102 as parameter information that changes according to the deterioration of the tube.
- the input / output unit 101 may determine an initial value of sound velocity for each type of pipe.
- the input / output unit 101 may send an arbitrary value to the transfer characteristic deriving unit 102 as an initial value of a parameter (sound speed in the present embodiment).
- a parameter sound speed in the present embodiment
- the speed of sound in a liquid generally takes a value in the range of 1000 to 1500 m / s.
- the input / output unit 101 may send a value of 1200 m / s as the parameter value.
- the input / output unit 101 may acquire a parameter value from the analysis model 20 or may be acquired by a user input. At this time, since the acquired value can be corrected by the correction unit 107 described later, it is not necessary to be accurate.
- the parameter that changes according to the deterioration of the pipe may not be the sound speed itself.
- the parameter that changes in accordance with the deterioration of the tube may be a parameter that is essentially equivalent to the sound speed, such as a reciprocal of the sound speed or a parameter that is a constant multiple of the sound speed. That is, the parameter that changes in accordance with the deterioration of the tube may be a parameter based on the sound speed (including the sound speed itself).
- the input / output unit 101 may send information related to the water pressure of the fluid flowing through the end point to the transfer characteristic deriving unit 102.
- the input / output unit 101 may send out information indicating in which water pressure range the water pressure of the fluid flowing through the end point varies. This information can be used when the transfer characteristic deriving unit 102 derives a transfer characteristic described later.
- the input / output unit 101 sends water pressure information at the end of the pipe network to the calculation unit 103.
- the information on the water pressure to be sent out is, for example, waveform data of water pressure at each end point (points 1, 2, and 4 in the example shown in FIG. 2).
- the water pressure waveform data is data representing characteristics of water pressure transition.
- the characteristics of the transition of water pressure are information on the transition of water pressure that can change according to the state of the pipe network. In other words, the characteristics of the water pressure transition are meaningful information about the water pressure transition.
- the water pressure waveform data is, for example, data representing a temporal change in water pressure. This data is, for example, an actual measurement value acquired by a sensor.
- FIG. 3 is a specific example of data representing a temporal change in water pressure at each of a plurality of points.
- the numbers indicating the graphs represent the numbers of the respective points shown in FIG.
- each data is represented by a graph, but the data handled by the analysis device 11 does not need to be graphed.
- the data may be a data string in which time and water pressure are associated.
- the water pressure waveform data may be represented by, for example, amplitude information for each water pressure frequency, that is, a frequency distribution.
- the water pressure waveform data may include phase information for each water pressure frequency.
- the input / output unit 101 may acquire water pressure waveform data by input from a user or the like, and send it to the calculation unit 103. At this time, the input / output unit 101 may convert the acquired water pressure waveform into a frequency distribution and send it to the calculation unit 103. For example, when the acquired waveform is a temporal change in water pressure, the input / output unit 101 can obtain a frequency distribution by performing Fourier transform on the waveform. The input / output unit 101 may send the obtained frequency distribution to the calculation unit 103.
- the input / output unit 101 sends the waveform data of the water pressure at an internal point (point 5 in the example shown in FIG. 2) to the waveform comparison unit 105.
- the waveform data of the water pressure at the internal point sent out by the input / output unit 101 is also referred to as input internal waveform data.
- the input internal waveform data may be a time domain waveform or a frequency distribution.
- the input / output unit 101 sends information on the determination criterion to the determination unit 106.
- the determination criterion is a criterion for determination by the determination unit 106.
- the information of the determination criterion is, for example, a range of allowable mismatch values (the mismatch level will be described later). In this case, it can be said that the mismatch degree satisfies the criterion for determination when the mismatch degree is within the “range of allowable mismatch degree values”.
- the determination criterion information may be an upper limit of the allowable mismatch degree, that is, a threshold value. In this case, the determination unit 106 to be described later determines whether or not the mismatch degree is equal to or less than the threshold value.
- the input / output unit 101 may send, to the correction unit 107, designation of a parameter to be corrected among parameters related to the pipe within the analysis range.
- the parameter to be corrected is, for example, the speed of sound.
- the input / output unit 101 may give the correction unit 107 information indicating that the speed of sound is selected as a parameter to be corrected.
- the input / output unit 101 may specify only the sound speed of a part of the pipe network as a parameter to be corrected.
- the parameter to be corrected may be the amount of thinning.
- the correction unit 107 corrects the value of D / t in equation (1) for all the pipes under the assumption that the amount of thinning in all the pipes constituting the pipe network is the same. Also good.
- the input / output unit 101 receives information derived by the deriving unit 108 described later and outputs the information to the user or the like.
- a transfer characteristic is a value or a set of values representing the relationship between voltage and current at a plurality of terminals in an electric network. That is, the transfer characteristic deriving unit 102 derives transfer characteristics related to terminals corresponding to designated end points and internal points when the pipe network is modeled by an electric circuit network.
- Modeling a pipe network with an electric network creates a model of an electric network that can simulate the state of the fluid flowing through the pipe network by associating the flow rate of the fluid flowing through the pipe network with the current and the pressure with the voltage. In other words, it is assumed).
- the current in the modeled electrical network and the flow rate of the fluid flowing through the tube network can be converted into each other.
- voltage and pressure can be converted into each other.
- the transfer characteristic deriving unit 102 for example, for each voltage frequency, as a transfer characteristic based on the end point and the internal point, the voltage and current at the terminal corresponding to the end point and the terminal corresponding to the internal point, To derive the coefficient of the relation.
- the transfer characteristic deriving unit 102 performs modeling by replacing the state of the specified range of the pipe network with the electric circuit network, and simulates the behavior of the electric circuit. Based on the simulation, the transfer characteristic deriving unit 102 is connected between terminals (nodes) corresponding to end points designated by the input / output unit 101 and terminals (nodes) corresponding to internal points in the electric network. The relationship between voltage and current is derived as transfer characteristics.
- the transfer characteristic is represented by a matrix of Y jk (1 ⁇ j ⁇ n, 1 ⁇ k ⁇ n) in the following equation, for example.
- I k (1 ⁇ k ⁇ n) flows from the outside of the electric network (or flows out of the electric network) at the k-th node (corresponding to the specified point).
- the current, Vk is the voltage at the kth node.
- Equation (2) The matrix composed of Y jk (1 ⁇ j ⁇ n, 1 ⁇ k ⁇ n) in Equation (2) is generally called an admittance matrix (admittance matrix). Y jk is also called an admittance parameter.
- the admittance matrix is used in a calculation formula that allows the current flowing from outside (or flowing out of the electrical network) at each node of the electrical network to be obtained from the voltage of each node. it can.
- the admittance matrix can be calculated based on the modeled electric circuit network and electromagnetic laws by an electric circuit simulator such as SPICE (Simulation Program with Integrated Circuit Emphasis).
- the electric circuit simulator may be, for example, a simulator using a characteristic curve method, or a general simulator capable of calculating an electric flow using a finite element method or a particle method.
- the transfer characteristic deriving unit 102 may calculate an admittance matrix in cooperation with an electric circuit simulator (not shown).
- the electric circuit simulator may be outside the analysis device 11.
- the transfer characteristic deriving unit 102 may include a function equivalent to that of the electric circuit simulator.
- the transfer characteristic deriving unit 102 sends, from the information on the pipe network received from the input / output unit 101, an electric circuit network that models the pipe network and a specified point to the electric circuit simulator, and the electric circuit simulator Calculate the admittance matrix.
- the transfer characteristic deriving unit 102 acquires the calculated admittance matrix as the transfer characteristic. In this way, the transfer characteristic deriving unit 102 derives the transfer characteristic.
- the transfer characteristic deriving unit 102 only needs to have a function necessary for calculating an admittance matrix without providing an electric circuit simulator.
- the 1st to (n-1) th nodes correspond to end points, and the nth node corresponds to an internal point.
- the transfer characteristic deriving unit 102 may derive only elements related to the current of the n-th node, that is, Y n1 to Y nn as transfer characteristics.
- the transfer characteristic deriving unit 102 derives the transfer characteristic for each frequency of the voltage.
- the transfer characteristic deriving unit 102 may obtain a transfer characteristic for each frequency by giving a sine wave of various frequencies to the terminal and obtaining an output current to the electric circuit simulator.
- the transfer characteristic deriving unit 102 may obtain the transfer characteristic for each frequency by Fourier transform from the response characteristic when an impulse waveform is given to the electric circuit simulator.
- the transfer characteristic deriving unit 102 sends the derived transfer characteristic to the calculation unit 103.
- the calculation unit 103 can calculate the water pressure at an internal point. In the following description, it is assumed that the internal point for which the water pressure is calculated is the nth node.
- This equation (4) is understood as an equation for obtaining the voltage of the nth node, which is an internal point, from the voltages of nodes other than the nth node. That is, based on equation (4), the calculation unit 103 can calculate V n if the values of Y n1 to Y nn and the values of V 1 to V n ⁇ 1 are known.
- V 1 to V n-1 are variables that can be converted from the water pressure at the end points. Therefore, the calculation unit 103 can obtain the value of V n from the transfer characteristics (Y n1 to Y nn ) and the water pressure at the end points. Calculation unit 103 obtains a V n, a V n obtained may be converted to water pressure. The converted value represents the water pressure at the internal point. In this way, the calculation unit 103 can obtain the water pressure at the internal point.
- equation (4) may be modified without departing from the technical idea disclosed by this embodiment.
- equation (4) may be transformed into an equation representing the relationship between the water pressure at the end points and the water pressure at the internal points based on the association between the voltage and the water pressure.
- the calculation unit 103 may directly obtain the water pressure at the internal point from the water pressure at the end point by the equation.
- the calculation unit 103 may convert the obtained frequency distribution into waveform data that changes with time by inverse Fourier transform or the like.
- the waveform data (including data representing the frequency distribution) generated by the calculation of the calculation unit 103 is also referred to as calculated internal waveform data.
- the calculation unit 103 sends the generated calculated internal waveform data to the waveform comparison unit 105.
- the waveform data used for the comparison may be a frequency distribution or a time domain waveform.
- the waveform comparison unit 105 may convert the type of one waveform into the type of the other waveform data. For example, when comparing two waveforms with a time domain waveform, the waveform comparison unit 105 may convert the frequency distribution into a time domain waveform by inverse Fourier transform or the like.
- the waveform comparison unit 105 calculates the difference between the two waveform data as a comparison between the two waveforms.
- the difference is information representing the degree of dissimilarity between the two data.
- the difference is information indicating the degree of mismatch.
- Information indicating the degree of mismatch between the two waveform data (hereinafter, “degree of mismatch”) may be represented, for example, by the size or ratio of the mismatch.
- the degree of mismatch between the two waveform data may be obtained, for example, by the sum of absolute values of the difference between the numerical values at the respective feature points of the two waveform data.
- the method for calculating the degree of inconsistency is not limited to this.
- the waveform comparison unit 105 may calculate the degree of coincidence (similarity) instead of the degree of inconsistency.
- the degree of coincidence may be calculated by, for example, the number of coincident frequencies among a plurality of feature points extracted from each waveform data.
- the waveform comparison unit 105 calculates the degree of mismatch between two waveforms. It is assumed that the value of the mismatch degree is larger as the degree of mismatch is larger. Since the degree of inconsistency changes according to the pipe network model used in the transfer characteristic deriving unit 102, it can be said that the degree of inconsistency is one of indexes indicating the accuracy of the pipe network model.
- the accuracy of the pipe network model is the correctness of the pipe network information (sound speed, etc.) used in the generation of the pipe network model.
- the determination unit 106 determines that the mismatch level satisfies the determination criterion when the mismatch level is equal to or lower than the threshold value, and determines that the mismatch level does not satisfy the determination criterion when the mismatch level exceeds the threshold value. To do.
- the analysis apparatus 11 executes a process that will be described later by the correction unit 107.
- the analysis apparatus 11 performs a process described later by the derivation unit 108.
- the determination unit 106 may transmit the final value of the corrected parameter to the derivation unit 108.
- the parameter to be modified is the speed of sound in one or more of the tubes that make up the tube network.
- the correcting unit 107 may correct the parameter value based on the mismatch value.
- an algorithm is used in which the parameter value approaches the optimum value by repeating the determination and correction by the determination unit 106.
- the correction unit 107 may perform the above-described correction by, for example, a Nelder-Mead method or a method based on a genetic algorithm.
- the correction method may be a method using a Kalman filter.
- the correction unit 107 transmits the corrected value, that is, the correction value to the input / output unit 101, for example.
- the input / output unit 101 sends information on the pipe network reflecting the received correction value to the transfer characteristic deriving unit 102.
- the transfer characteristic deriving unit 102 calculates the transfer characteristic again based on the information of the pipe network in which the correction value is reflected.
- the information related to deterioration is, for example, information indicating the degree of deterioration, that is, the degree of progress of deterioration.
- the value of sound velocity which is a parameter modified in the present embodiment, is a value that varies depending on the thickness of the tube, and is information indicating the degree of deterioration. Therefore, the derivation unit 108 may treat the corrected sound speed value itself as information related to tube deterioration.
- the deriving unit 108 may calculate the degree of decrease in the sound speed value compared to the reference value.
- the reference value at this time may be, for example, a sound speed value calculated based on a design value, or may be calculated based on the same determination criterion by analysis performed on the same pipe network in the past.
- the value of sound speed may be used. If the reference value is based on the value of sound velocity in a pipe network model that satisfies the same criteria in an analysis performed on the same pipe network in the past, how much the pipe has deteriorated from the past time point. It becomes clear.
- the value of pipe wall thickness is one piece of information related to pipe deterioration.
- the deriving unit 108 may derive the value of the tube thickness based on the value of the sound velocity and the equation (1).
- the deriving unit 108 may further derive a ratio of the derived thickness value to a reference value (design value or the like).
- the derivation unit 108 may be configured to be able to refer to a database (not shown) that stores reference values.
- the deriving unit 108 may derive information regarding deterioration based on information included in the database.
- the information related to deterioration may be a sentence, a symbol and a signal indicating either “deteriorated” or “not deteriorated”, or a combination thereof.
- the derivation unit 108 outputs information indicating that “the pipe has deteriorated” when the value of the sound velocity is out of a predetermined reference (for example, a preset range). Also good.
- This predetermined standard may be set by the user or the designer of the analysis apparatus 11 via the input / output unit 101 or the like.
- this predetermined criterion is based on the value of sound velocity in a pipe network model that satisfies the same judgment criterion in the analysis performed on the same pipe network in the past, the deterioration degree from the past time point Knowledge can be obtained.
- the information regarding deterioration may be any of sentences, symbols and signals that evaluate the deterioration level in multiple stages, or a combination thereof.
- the deriving unit 108 sends the derived information to the input / output unit 101, for example.
- FIG. 4 is a flowchart showing an operation flow of the analysis apparatus 11 according to the present embodiment.
- the input / output unit 101 sends information necessary for analysis to the transfer characteristic deriving unit 102 (step S41).
- the information necessary for the analysis includes, for example, structure information of the pipe network (including designation of end points and internal points) and information of parameters that change according to the thickness of the pipe.
- the input / output unit 101 when the input / output unit 101 sends the network information illustrated in FIG. 2 to the transfer characteristic deriving unit 102, the connection relationship between the points 1, 2, 3, 4, and 5 Sends parameters related to pipes.
- the input / output unit 101 has a pipe length between point 1 and point 5 of 100 m, a pipe diameter of 30 mm, a flow coefficient of 100, a pipe length between point 5 and point 3 of 20 m, a pipe diameter of 30 mm, and a flow coefficient.
- 100, pipe length between point 3 and point 2 is 80m
- pipe diameter is 25mm
- flow coefficient 80
- pipe length between point 3 and point 4 is 120m
- pipe diameter is 30mm
- flow coefficient 100
- the input / output unit 101 sends the value of the sound speed between points as information on parameters that change according to the thickness of the tube, for example. As an example, it is assumed that the input / output unit 101 sends 1200 m / s as the sound speed between point 1 and point 4 and 1150 m / s as the sound speed between point 3 and point 2 to the transfer characteristic deriving unit 102.
- the input / output unit 101 sends water pressure waveform data at the end points (points 1, 2, and 4 in the example shown in FIG. 2) to the calculation unit 103.
- the input / output unit 101 sends the waveform data of the water pressure at an internal point (point 5 in the example shown in FIG. 2) to the waveform comparison unit 105.
- the input / output unit 101 sends determination criterion information to the determination unit 106.
- the input / output unit 101 sends a numerical value of “0.1” to the determination unit 106 as determination criterion information. Based on this information, the determination unit 106 determines that the determination criterion is “the degree of mismatch is 0.1 or less” in step S46 described later.
- the input / output unit 101 sends to the correction unit 107 designation of a parameter to be corrected in the analysis model 20.
- the input / output unit 101 specifies the speed of sound between points 1 and 4 as a parameter to be corrected.
- the transfer characteristic deriving unit 102 derives the transfer characteristic based on the information on the pipe network (step S42).
- the transfer characteristic deriving unit 102 receives the information of the pipe network illustrated in FIG. 2, for example, the voltage at the node corresponding to the points 1, 2, 4, and 5 in the electric network that models the pipe network is used. An admittance matrix representing the relationship between current and current is calculated.
- the transfer characteristic deriving unit 102 models the pipe network into an electric network based on the pipe network information received from the input / output unit 101. Specifically, the transfer characteristic deriving unit 102 generates data for simulating an electric circuit network imitating a pipe network.
- the transfer characteristic deriving unit 102 may model the elements (pipe etc.) constituting the pipe network by combining circuit elements.
- the pipe 301 constituting the pipe network may be associated with an electric circuit 302 including a coil 311, a capacitor 312, and a resistor 313 as illustrated in FIG. 5. Therefore, for example, the transfer characteristic deriving unit 102 may model the pipes 301 connecting the points shown in FIG. At this time, the inductance L of the coil 311, the capacitance C of the capacitor 312, and the resistance value R of the resistor 313 in the electric circuit 302 are obtained by the following equation (5), respectively.
- the transfer characteristic deriving unit 102 replaces a pipe between points of the pipe network with an electric circuit 302 including a coil 311, a capacitor 312, and a resistor 313 as shown in FIG. Build virtually. Specifically, for example, the transfer characteristic deriving unit 102 generates data for creating an electric circuit network in which a pipe between points is modeled by the electric circuit 302, and sends the data to the electric circuit simulator. Thereby, an electric circuit network based on the pipe network is virtually generated.
- a model generated based on the pipe network is referred to as a “pipe network model”.
- FIG. 6 An electric circuit network created by modeling each pipe of the pipe network shown in FIG. 2 with the electric circuit 302 is as shown in FIG. In FIG. 6, broken lines with numerals represent terminal positions corresponding to the points on the pipe network shown in FIG. 2.
- the transfer characteristic deriving unit 102 may use a circuit element that models the magnitude of pressure lost by the resistor 313 (pressure loss). Assuming that the pressure loss is P, P can be expressed by the following equation (6) based on, for example, the Hazen Williams equation.
- the flow coefficient is a constant representing the ease of fluid flow in the pipe in the Hazen-Williams equation.
- the flow coefficient can be determined, for example, according to the years of use.
- Formula (6) is an example when the fluid flowing through the pipe network is water, and the formula representing the pressure loss can be an appropriate formula depending on the type of fluid and various conditions.
- the transfer characteristic deriving unit 102 may use, for example, a circuit element representing a pressure loss as shown in Expression (6) in the electric circuit network.
- the transfer characteristic deriving unit 102 may model the resistor 313 using a non-linear voltage source whose output voltage varies depending on the current.
- the transfer characteristic deriving unit 102 sends to the electric circuit simulator data for simulating the electric circuit network created by modeling as described above. Then, the transfer characteristic deriving unit 102 sends to the electric circuit simulator a node corresponding to the end point and a node corresponding to the internal point (points 1 and 2 in the example shown in FIG. 2). , 4, 5) is calculated.
- the transfer characteristic deriving unit 102 calculates an admittance matrix by performing an analysis using an input signal having a small amplitude, for example, called small signal analysis, by an electric circuit simulator.
- the small signal analysis is an analysis method that allows a non-linear element in an electric circuit to be regarded as a linear element by assuming that the amplitude of an input signal is small.
- a small signal model composed of linear elements is assumed on the assumption that the amplitude of the input signal is small, and an output with respect to a voltage of a designated frequency can be calculated. That is, according to the small signal analysis, the admittance matrix can be approximately numerically calculated even when the electric circuit includes the circuit element representing the nonlinear relationship between the voltage and the current as described above.
- the transfer characteristic deriving unit 102 acquires an admittance matrix obtained by calculation as a transfer characteristic. For example, when the admittance matrix for points 1, 2, 4, and 5 in the example illustrated in FIG. 2 is calculated, the transfer characteristic deriving unit 102 corresponds to each element of the admittance matrix of Expression (2), Y 11 , Y 12 , Y 14 , Y 15 , Y 21 , Y 22 , Y 24 , Y 25 , Y 41 , Y 42 , Y 44 , Y 45 , Y 51 , Y 52 , Y 54 , and Y 55 as transfer characteristics To derive.
- the transfer characteristic deriving unit 102 may obtain only the value of the element related to the point 5.
- the transfer characteristic deriving unit 102 may obtain Y 51 , Y 52 , Y 54 , and Y 55 corresponding to Y n1 to Y nn in Expression (3) as transfer characteristics.
- the transfer characteristic deriving unit 102 transmits the derived transfer characteristic to the calculating unit 103.
- the calculation unit 103 calculates the internal points (in FIG. In the example shown, calculated internal waveform data that is waveform data at point 5) is calculated (step S43). Specifically, according to the example shown in FIG. 2, first, the calculation unit 103 calculates the values of V 1 to V 4 (corresponding to V 1 to V n ⁇ 1 in the equation (4)) at the end points. It is calculated by converting the water pressure value in to the voltage value.
- the calculation unit 103 substitutes the values of V 1 to V 4 and Y 51 to Y 55 into Equation (4) to obtain the value of V 5 (corresponding to V n in Equation (4)).
- the V 5 obtained is converted to a value of water pressure, and calculates the converted value as the pressure value inside a point.
- step S44 the waveform comparison unit 105 compares the calculated internal waveform data calculated by the calculation unit 103 with the input internal waveform data sent by the input / output unit 101. Specifically, the waveform comparison unit 105 calculates the degree of inconsistency between the calculated internal waveform data obtained by the calculation unit 103 and the input internal waveform data transmitted by the input / output unit 101.
- FIG. 7 is an example of a calculated internal waveform graph (graph 701) and an input internal waveform graph (graph 601) when the sound speed between points 1 and 4 is 1200 m / s.
- the waveform comparison unit 105 calculates the degree of mismatch between the two waveform data represented by the frequency distribution. As an example, the waveform comparison unit 105 obtains the absolute values of the water pressure differences at frequencies of 1/6 Hz from 1/6 Hz to 10 Hz, and sums the values. The waveform comparison unit 105 calculates the total value as the value of the mismatch degree. As an example, it is assumed that the value of the mismatch degree calculated by the waveform comparison unit 105 is 0.29.
- the waveform comparison unit 105 sends the calculated mismatch value to the waveform comparison unit 105.
- step S45 determines whether or not the mismatch degree satisfies the determination criterion.
- the processing of the analysis device 11 proceeds to step S46 without exiting the repetition processing.
- the criterion in the description of this operation example is“ the degree of mismatch is 0.1 or less ”. When the degree of mismatch is 0.29, the determination criterion is not satisfied, and the processing of the analysis apparatus 11 proceeds to step S46.
- step S45 If the degree of inconsistency satisfies the criterion (YES in step S45), the processing of the analysis apparatus 11 proceeds to step S47.
- step S46 the correction unit 107 corrects the parameter value.
- the correction unit 107 sends the corrected value to the input / output unit 101.
- the input / output unit 101 sends the received correction value to the transfer characteristic deriving unit 102.
- the analysis apparatus 11 performs the operations from step S42 to step S45 again using the value corrected by the correction unit 107.
- the analysis device 11 repeats this process until the value of the mismatch degree satisfies the determination criterion. As a result, a value satisfying the criterion of the parameter is obtained.
- the determination unit 106 is configured to end the iterative process when the mismatch level does not satisfy the determination criterion after the predetermined number of times or the predetermined time has elapsed or when the mismatch level is not improved. May be.
- the deriving unit 108 derives information on deterioration based on the obtained sound speed value. For example, the derivation unit 108 outputs a signal indicating “normal” if the sound speed value is within the range of 1050 to 1200 m / s, and “deteriorates” if the sound speed value is outside the range of 1050 to 1200 m / s. Assume that a signal indicating is output. In this case, if the calculated sound velocity value is 1000 m / s, the derivation unit 108 outputs a signal indicating “deterioration”. Alternatively, the deriving unit 108 may calculate a value of a ratio between the calculated sound speed value and the previously calculated sound speed value. If the previously calculated sound velocity value is 1200 m / s, a value of 83% may be output.
- the deriving unit 108 may send the derived information to the input / output unit 101.
- the input / output unit 101 outputs the information received from the derivation unit 108 to, for example, the user (step S48). In this way, the user acquires information related to the wall thickness of the tube derived by the analysis device 11.
- the input / output unit 101 may display the calculated internal waveform data graph calculated using the correction value and the input internal waveform data graph in an overlapping manner.
- FIG. 8 shows an example in which the graphs of the two waveform data are displayed in an overlapping manner.
- a graph 601 is a graph of input internal waveform data
- a graph 702 is a graph of calculated internal waveform data when the sound speed value is 1000 m / s.
- an output destination (for example, a user) can obtain information related to deterioration of a pipe to be analyzed.
- the reason is that when the accuracy of the pipe network model based on information including a parameter whose value changes according to the deterioration of the pipe satisfies a predetermined condition, information on the deterioration based on the value of the parameter is derived. is there.
- the data used by the analysis device 11 is the structure information of the pipe network, the waveform data at the end points of the analysis range, and the waveform data at the internal points. If an accessible point in the pipe such as an air vent valve or a fire hydrant is set as an end point, the user can easily acquire waveform data. Therefore, the analysis device 11 can acquire information on the deterioration of the tube based on information that can be acquired by a simple method.
- the correction unit 107 corrects the parameter value until the degree of inconsistency satisfies the determination criterion, so that the analysis device 11 can derive information on the deterioration with accuracy desired by the user.
- the analysis device 11 can extract changes in information related to the inner diameter and thickness of the tube by modifying the analysis model by changing only the sound velocity.
- FIG. 9 is a block diagram illustrating a configuration of an analysis apparatus 12 that is a modification of the first embodiment.
- the analysis device 12 may not include the correction unit 107.
- the determination unit 106 notifies the derivation unit 108 of the result of determining whether the degree of mismatch satisfies the determination criterion.
- the deriving unit 108 derives different information according to the determined result. For example, the deriving unit 108 outputs a signal indicating that “accuracy is within the allowable range” when the degree of inconsistency satisfies the determination criterion, and “accuracy is not within the allowable range when the degree of inconsistency does not satisfy the determination criterion. It is sufficient to output a signal indicating ".”
- the information derived in this way is information that changes according to the result of the determination, it is one piece of information related to the thickness of the tube based on the value of the parameter.
- the output destination can know whether or not the parameter value received from the input / output unit 101 is within the allowable range of accuracy based on the derived information. That is, the output destination can acquire information related to the deterioration of the pipe.
- FIG. 10 is a block diagram showing a configuration of the analysis apparatus 10 according to an embodiment of the present invention.
- the analysis apparatus 10 includes a determination unit 106 and a derivation unit 108.
- the determination unit 106 determines whether the accuracy of the pipe network model based on information including a parameter whose value changes according to deterioration of the pipes constituting the pipe network satisfies a predetermined condition.
- the pipe network model can be generated based on the structure of the pipe, the characteristics of the pipe, the waveform data at the end points, the waveform data at the internal points, and the parameters described above by a functional configuration not shown.
- the deriving unit 108 derives information on the deterioration of the pipe based on the parameters when the accuracy of the pipe network model satisfies a predetermined condition.
- FIG. 11 is a flowchart showing the flow of operation of each component of the analysis apparatus 10.
- step S111 the determination unit 106 determines whether the accuracy of the pipe network model based on information including a parameter whose value changes in accordance with deterioration of the pipes constituting the pipe network satisfies a predetermined condition.
- the deriving unit 108 derives information related to the deterioration of the pipe based on the parameters when the accuracy of the pipe network model satisfies a predetermined condition (step S113).
- Some or all of the analysis devices described in the above embodiments may be configured by dedicated hardware. In that case, a part or all of each component may be realized as integrated hardware (an integrated circuit or the like on which logic for executing processing is mounted).
- each component when each component is realized by hardware, each component may be implemented as a SoC (System on a Chip) in which circuits capable of providing each function are integrated.
- SoC System on a Chip
- data held by each component may be stored in a storage area of a RAM (Random Access Memory) integrated as SoC or a storage area of a flash memory.
- RAM Random Access Memory
- a well-known communication bus may be adopted as a communication line for connecting each component.
- the communication line connecting each component is not limited to bus connection.
- Each component may be connected by peer-to-peer.
- analysis device described above or the components of the analysis device include a part or all of the hardware exemplified in FIG. 12, and various software programs (computer programs) executed by the hardware. It may be realized by a possible combination of
- Each component of the hardware device 1500 can communicate with each other via a bus 1511.
- the arithmetic device 1501 is an arithmetic processing device such as a general-purpose CPU or a microprocessor.
- the arithmetic device 1501 may read various software programs stored in a non-volatile storage device 1502, which will be described later, into the storage device 1503, and execute processing according to the read software programs. Any or all of the transfer characteristic deriving unit 102, the calculating unit 103, the waveform comparing unit 105, the determining unit 106, the correcting unit 107, and the deriving unit 108 in each embodiment perform the respective arithmetic processing using the arithmetic device 1501. May be executed.
- the storage device 1503 is a memory device such as a RAM that can be referred to from the arithmetic device 1501, and stores software programs, various data, and the like. Note that the storage device 1503 may be a volatile memory device.
- the nonvolatile storage device 1502 is a nonvolatile storage device such as a magnetic disk drive or a semiconductor storage device using flash memory.
- the nonvolatile storage device 1502 can store software programs, data, and the like.
- the conversion information that associates the constituent elements of the pipe network with the constituent elements of the electric circuit network that models the constituent elements of the pipe network may be stored in the nonvolatile storage device 1502 in the form of a file, a database, or the like. .
- the communication interface 1508 is an interface device connected to the communication network 1509.
- the communication interface 1508 may be, for example, a wired or wireless LAN (Local Area Network) connection interface device.
- the input / output unit 101 in each embodiment may accept input of the analysis model 20, end and internal waveform data, parameters to be corrected, and the like from another system (not shown) via the communication interface 1508. .
- the drive device 1507 is, for example, a device that processes reading and writing of data with respect to a recording medium 1506 to be described later.
- the recording medium 1506 is a recording medium capable of recording data, such as an optical disk, a magneto-optical disk, and a semiconductor flash memory.
- the input / output interface 1510 is a device that controls input / output with an external device.
- the user of the analysis device uses an input / output device (eg, keyboard, mouse, display device, printer, etc.) connected to the analysis device via the input / output interface 1510 to the analysis device.
- Information, the range of analysis and specification of internal points, waveform data, or various instructions may be transmitted.
- the input / output unit 101 in each embodiment may be realized using an input / output device connected to the input / output interface 1510.
- the analysis device may be realized by the hardware device 1500 illustrated in FIG.
- the analysis device may be realized by supplying a software program capable of realizing the functions described in each embodiment to the hardware device 1500.
- each embodiment may be realized by the arithmetic device 1501 executing the software program supplied to the hardware device 1500.
- each unit illustrated in FIGS. 1, 9, and 10 can be realized as a software module, which is a function (processing) unit of a software program executed by the above-described hardware.
- a software module which is a function (processing) unit of a software program executed by the above-described hardware.
- the division of each software module shown in these drawings is a configuration for convenience of explanation. Various configurations can be envisaged when implementing the software module.
- the nonvolatile storage device 1502 may store these software modules.
- the arithmetic device 1501 may be configured to read out these software modules to the storage device 1503 when executing each process.
- these software modules may be configured to be able to transmit various data to each other by an appropriate method such as shared memory or interprocess communication. With such a configuration, these software modules can be connected so as to communicate with each other.
- each software program may be recorded on the recording medium 1506.
- the software program may be stored in the nonvolatile storage device 1502 through the drive device 1507 as appropriate at the shipping stage or operation stage of the communication device.
- a method of supplying various software programs to the analysis apparatus a method of installing in the apparatus using an appropriate jig in a manufacturing stage before shipment or a maintenance stage after shipment. May be adopted. Further, as a method for supplying various software programs, a general procedure may be adopted at present such as a method of downloading from the outside via a communication line such as the Internet.
- the analysis device of each embodiment can be considered to be configured by a computer-readable storage medium in which codes constituting a software program are recorded.
- the analysis device described above or the components of the analysis device include a virtual environment in which the hardware device 1500 illustrated in FIG. 12 is virtualized, and various software programs (computer program) executed in the virtual environment. Program).
- the components of the hardware apparatus 1500 illustrated in FIG. 12 are provided as virtual devices in the virtual environment.
- the analysis apparatus of each embodiment can be realized with the same configuration as when the hardware device 1500 illustrated in FIG. 12 is configured as a physical device.
- Appendix 1 Determining means for determining whether the accuracy of the pipe network model based on information including a parameter whose value changes according to deterioration of the pipe satisfies a predetermined condition; Derivation means for deriving information on the deterioration of the pipe based on the parameter when the accuracy satisfies the predetermined condition;
- An analysis apparatus comprising: [Appendix 2] When the accuracy of the pipe network model does not satisfy the predetermined condition, further comprising a correction means for correcting the value of the parameter, The correction means repeats the correction until the determination means determines that the accuracy of the pipe network model reflecting the correction satisfies the predetermined condition.
- the analyzer according to appendix 1.
- the parameter is a parameter based on the speed of sound in the fluid flowing through the tube.
- the information on the deterioration of the pipe is information on the thickness of the pipe.
- the deriving means outputs information indicating that the pipe is deteriorated when the value of the parameter does not satisfy a predetermined criterion;
- the predetermined criterion is a criterion based on the parameters of the pipe network model that has previously satisfied the predetermined condition.
- the determination means is characterized in that the accuracy of the pipe network model is a characteristic of a transition of pressure at a point inside the pipe derived from a characteristic of a transition of pressure of the fluid flowing in the pipe at the end of the pipe. Calculating based on a comparison between the characteristics of the transition of 1 and the characteristics of the second transition input as the characteristics of the transition of pressure at the internal point of the fluid flowing through the pipe; The analyzer according to any one of appendices 1 to 6.
- [Appendix 8] Determine whether the accuracy of the pipe network model based on information including parameters whose values change according to the deterioration of the pipe satisfies a predetermined condition, Deriving information on the deterioration of the tube based on the parameters when the accuracy satisfies the predetermined condition; analysis method.
- [Appendix 9] When the accuracy of the pipe network model does not satisfy the predetermined condition, the value of the parameter is corrected, Repeating the correction until the accuracy of the pipe network model reflecting the correction satisfies the predetermined condition, The analysis method according to attachment 8.
- the parameter is a parameter based on the speed of sound in the fluid flowing through the tube. The analysis method according to appendix 8 or 9.
- the information on the deterioration of the pipe is information on the thickness of the pipe.
- the predetermined criterion is a criterion based on the parameters of the pipe network model that has previously satisfied the predetermined condition. The analysis method according to attachment 12.
- the first transition characteristic which is the characteristic of the transition of pressure at a point inside the pipe, the accuracy of the pipe network model being derived from the characteristic of the transition of pressure of the fluid flowing in the pipe at the end of the pipe
- a second transition feature inputted as a transition feature of the pressure at the internal point of the fluid flowing through the pipe, The analysis method according to any one of appendices 8 to 13.
- the parameter is a parameter based on the speed of sound in the fluid flowing through the tube.
- the information on the deterioration of the pipe is information on the thickness of the pipe.
- the derivation process outputs information indicating that the pipe has deteriorated when the value of the parameter does not satisfy a predetermined criterion.
- the predetermined criterion is a criterion based on the parameters of the pipe network model that has previously satisfied the predetermined condition.
- the determination process is characterized in that the accuracy of the pipe network model is a characteristic of a pressure transition at a point inside the pipe derived from a characteristic of a pressure transition of the fluid flowing through the pipe at an end of the pipe. Calculating based on a comparison between the characteristics of the transition of 1 and the characteristics of the second transition input as the characteristics of the transition of pressure at the internal point of the fluid flowing through the pipe; The program according to any one of appendices 15 to 20.
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Abstract
Description
<構成>
本発明の第1の実施形態について説明する。図1は、本発明の第1の実施形態に係る解析装置11の構成を示すブロック図である。
入出力部101は、解析装置11に接続される情報処理装置(不図示)とのデータのやりとりを行う。入出力部101は、データを記憶する記憶媒体と接続されていてもよい。入出力部101は、解析装置11のユーザとデータをやりとりしてもよい。入出力部101は、ユーザがデータを書き込んだり、閲覧したりできるインタフェースを有していてもよい。入出力部101は、表示機能を有する出力装置に接続されていてもよい。
文献<1>:藤野 浩一、「水撃圧の代数学的手法による解析と揚水発電所水路系への応用に関する研究」、[online]、2001年10月、[2016年5月16日検索]、インターネット<URL:http://www.edit.ne.jp/~fkoichi/dron/ronbun/ronbun.pdf>
伝達特性導出部102は、入出力部101から受け取った管網の情報に基づいて、入出力部101により指定された端部の点および内部の点に関する伝達特性を導出する。伝達特性とは、電気回路網内の、複数の端子における電圧および電流の関係を表す値、または値の組である。すなわち、伝達特性導出部102は、管網を電気回路網でモデル化したときの、指定された端部の点および内部の点に相当する端子に関する伝達特性を導出する。
算出部103は、周波数ごとの伝達特性と、入出力部101から受け取った端部の点における水圧の波形データとに基づいて、内部の点における水圧の波形データを算出する。具体的には、算出部103は、周波数ごとに、伝達特性と、各端部の点における振幅の値とに基づき、内部の点における水圧の振幅を算出する。これにより、算出部103は、周波数ごとの、内部の点における水圧の振幅、すなわち周波数分布を得る。
波形比較部105は、入出力部101から受け取った入力内部波形データと、算出部103により算出された計算内部波形データとを比較する。比較に用いられる波形データは、周波数分布でもよいし、時間領域の波形でもよい。比較する波形データの種類を統一するため、波形比較部105は、一方の波形の種類を他方の波形データの種類に変換してもよい。たとえば、波形比較部105は、時間領域の波形で2つの波形を比較する場合、周波数分布を、逆フーリエ変換等によって、時間領域の波形に変換してもよい。
判定部106は、管網モデルの精度が、所定の条件を満たすかを判定する。本実施形態では、判定部106は、波形比較部105により算出された不一致度が、入出力部101からの受け取った判定基準を満たすか否かを判定する。たとえば、判定部106は、入出力部101から「許容する不一致度の上限の値」、すなわち閾値、を受け取っている場合、不一致度がその閾値以下であるか否かを判定する。このとき、判定部106は、不一致度がその閾値以下である場合は不一致度が判定基準を満たしているとし、不一致度がその閾値を超える場合は不一致度が判定基準を満たしていない、と判定する。
修正部107は、解析モデル20における、入出力部101から指定されたパラメータの値を修正する。本説明においては、修正されるパラメータは、管網を構成する管のうち1つ以上の管における音速である。修正部107は、たとえば、パラメータの値を、不一致度の値に基づいて修正すればよい。修正においては、判定部106による判定と修正とを繰り返すことによってパラメータの値が最適な値に近づくようなアルゴリズムを用いる。修正部107は、たとえば、Nelder-Mead法や、遺伝的アルゴリズムに基づく方法により、上述の修正を行えばよい。修正方法は、カルマンフィルタを用いる方法であってもよい。
導出部108は、修正されたパラメータの値に基づいて、管の劣化に関する情報を導出する。
第1の実施形態に係る解析装置11の動作を、具体的な例を示しながら説明する。図4は、本実施形態に係る解析装置11の動作の流れを示すフローチャートである。
本実施形態によれば、出力先(たとえばユーザ)は、解析の対象の管の劣化に関する情報を得ることができる。その理由は、管の劣化に応じて値が変化するパラメータを含む情報に基づく管網モデルの精度が所定の条件を満たす場合に、そのパラメータの値に基づいた劣化に関する情報が導出されるからである。
図9は、第1の実施形態の変形例である解析装置12の構成を表すブロック図である。
本発明の一実施態様に係る解析装置の主要構成について説明する。図10は、本発明の一実施態様に係る解析装置10の構成を示すブロック図である。
以下、上記説明した各実施形態を実現可能なハードウェア構成について説明する。
[付記1]
管の劣化に応じて値が変化するパラメータを含む情報に基づく管網モデルの精度が、所定の条件を満たすかを判定する判定手段と、
前記精度が前記所定の条件を満たす場合に、前記パラメータに基づいた、前記管の劣化に関する情報を導出する導出手段と、
を備える解析装置。
[付記2]
前記管網モデルの精度が前記所定の条件を満たさない場合に、前記パラメータの値の修正を行う修正手段をさらに備え、
前記修正手段は、前記判定手段が、前記修正が反映された前記管網モデルの精度が前記所定の条件を満たすと判定するまで、前記修正を繰り返す、
付記1に記載の解析装置。
[付記3]
前記パラメータは、前記管を流れる流体における音速に基づくパラメータである、
付記1または2に記載の解析装置。
[付記4]
前記管の劣化に関する情報は、前記管の肉厚に関する情報である、
付記1から3のいずれか一項に記載の解析装置。
[付記5]
前記導出手段は、前記パラメータの値が所定の基準を満たさない場合に、前記管が劣化していることを示す情報を出力する、
付記1から4のいずれか一項に記載の解析装置。
[付記6]
前記所定の基準は、過去に前記所定の条件を満たした前記管網モデルの前記パラメータに基づく基準である、
付記5に記載の解析装置。
[付記7]
前記判定手段は、前記管網モデルの精度を、前記管を流れる流体の、前記管の端部における圧力の推移の特徴から導出される前記管の内部の点における圧力の推移の特徴である第1の推移の特徴と、前記管を流れる流体の前記内部の点における圧力の推移の特徴として入力された第2の推移の特徴と、の比較に基づいて算出する、
付記1から6のいずれか一項に記載の解析装置。
[付記8]
管の劣化に応じて値が変化するパラメータを含む情報に基づく管網モデルの精度が、所定の条件を満たすかを判定し、
前記精度が前記所定の条件を満たす場合に、前記パラメータに基づいた、前記管の劣化に関する情報を導出する、
解析方法。
[付記9]
前記管網モデルの精度が前記所定の条件を満たさない場合に、前記パラメータの値の修正を行い、
前記修正が反映された前記管網モデルの精度が前記所定の条件を満たすまで、前記修正を繰り返す、
付記8に記載の解析方法。
[付記10]
前記パラメータは、前記管を流れる流体における音速に基づくパラメータである、
付記8または9に記載の解析方法。
[付記11]
前記管の劣化に関する情報は、前記管の肉厚に関する情報である、
付記8から10のいずれか一項に記載の解析方法。
[付記12]
前記パラメータの値が所定の基準を満たさない場合に、前記管が劣化していることを示す情報を出力する、
付記8から11のいずれか一項に記載の解析方法。
[付記13]
前記所定の基準は、過去に前記所定の条件を満たした前記管網モデルの前記パラメータに基づく基準である、
付記12に記載の解析方法。
[付記14]
前記管網モデルの精度を、前記管を流れる流体の、前記管の端部における圧力の推移の特徴から導出される前記管の内部の点における圧力の推移の特徴である第1の推移の特徴と、前記管を流れる流体の前記内部の点における圧力の推移の特徴として入力された第2の推移の特徴と、の比較に基づいて算出する、
付記8から13のいずれか一項に記載の解析方法。
[付記15]
コンピュータに、
管の劣化に応じて値が変化するパラメータを含む情報に基づく管網モデルの精度が、所定の条件を満たすかを判定する判定処理と、
前記精度が前記所定の条件を満たす場合に、前記パラメータに基づいた、前記管の劣化に関する情報を導出する導出処理と、
を実行させるプログラム。
[付記16]
コンピュータに、前記管網モデルの精度が前記所定の条件を満たさない場合に、前記パラメータの値の修正を行う修正処理をさらに実行させ、
前記修正処理は、前記判定処理が、前記修正が反映された前記管網モデルの精度が前記所定の条件を満たすと判定するまで、前記修正を繰り返す、
付記15に記載のプログラム。
[付記17]
前記パラメータは、前記管を流れる流体における音速に基づくパラメータである、
付記15または16に記載のプログラム。
[付記18]
前記管の劣化に関する情報は、前記管の肉厚に関する情報である、
付記15から17のいずれか一項に記載のプログラム。
[付記19]
前記導出処理は、前記パラメータの値が、所定の基準を満たさない場合に、前記管が劣化していることを示す情報を出力する、
付記15から18のいずれか一項に記載のプログラム。
[付記20]
前記所定の基準は、過去に前記所定の条件を満たした前記管網モデルの前記パラメータに基づく基準である、
付記19に記載のプログラム。
[付記21]
前記判定処理は、前記管網モデルの精度を、前記管を流れる流体の、前記管の端部における圧力の推移の特徴から導出される前記管の内部の点における圧力の推移の特徴である第1の推移の特徴と、前記管を流れる流体の前記内部の点における圧力の推移の特徴として入力された第2の推移の特徴と、の比較に基づいて算出する、
付記15から20のいずれか一項に記載のプログラム。
10~12 解析装置
20 解析モデル
101 入出力部
102 伝達特性導出部
103 算出部
105 波形比較部
106 判定部
107 修正部
108 導出部
301 パイプ
302 電気回路
601 入力内部波形データのグラフ
701 計算内部波形データのグラフ
702 計算内部波形データのグラフ
1500 ハードウェア装置
1501 演算装置
1502 不揮発性記憶装置
1503 記憶装置
1506 記録媒体
1507 ドライブ装置
1508 通信インタフェース
1509 通信ネットワーク
1510 入出力インタフェース
1511 バス
Claims (21)
- 管の劣化に応じて値が変化するパラメータを含む情報に基づく管網モデルの精度が、所定の条件を満たすかを判定する判定手段と、
前記精度が前記所定の条件を満たす場合に、前記パラメータに基づいた、前記管の劣化に関する情報を導出する導出手段と、
を備える解析装置。 - 前記管網モデルの精度が前記所定の条件を満たさない場合に、前記パラメータの値の修正を行う修正手段をさらに備え、
前記修正手段は、前記判定手段が、前記修正が反映された前記管網モデルの精度が前記所定の条件を満たすと判定するまで、前記修正を繰り返す、
請求項1に記載の解析装置。 - 前記パラメータは、前記管を流れる流体における音速に基づくパラメータである、
請求項1または2に記載の解析装置。 - 前記管の劣化に関する情報は、前記管の肉厚に関する情報である、
請求項1から3のいずれか一項に記載の解析装置。 - 前記導出手段は、前記パラメータの値が所定の基準を満たさない場合に、前記管が劣化していることを示す情報を出力する、
請求項1から4のいずれか一項に記載の解析装置。 - 前記所定の基準は、過去に前記所定の条件を満たした前記管網モデルの前記パラメータに基づく基準である、
請求項5に記載の解析装置。 - 前記判定手段は、前記管網モデルの精度を、前記管を流れる流体の、前記管の端部における圧力の推移の特徴から導出される前記管の内部の点における圧力の推移の特徴である第1の推移の特徴と、前記管を流れる流体の前記内部の点における圧力の推移の特徴として入力された第2の推移の特徴と、の比較に基づいて算出する、
請求項1から6のいずれか一項に記載の解析装置。 - 管の劣化に応じて値が変化するパラメータを含む情報に基づく管網モデルの精度が、所定の条件を満たすかを判定し、
前記精度が前記所定の条件を満たす場合に、前記パラメータに基づいた、前記管の劣化に関する情報を導出する、
解析方法。 - 前記管網モデルの精度が前記所定の条件を満たさない場合に、前記パラメータの値の修正を行い、
前記修正が反映された前記管網モデルの精度が前記所定の条件を満たすまで、前記修正を繰り返す、
請求項8に記載の解析方法。 - 前記パラメータは、前記管を流れる流体における音速に基づくパラメータである、
請求項8または9に記載の解析方法。 - 前記管の劣化に関する情報は、前記管の肉厚に関する情報である、
請求項8から10のいずれか一項に記載の解析方法。 - 前記パラメータの値が所定の基準を満たさない場合に、前記管が劣化していることを示す情報を出力する、
請求項8から11のいずれか一項に記載の解析方法。 - 前記所定の基準は、過去に前記所定の条件を満たした前記管網モデルの前記パラメータに基づく基準である、
請求項12に記載の解析方法。 - 前記管網モデルの精度を、前記管を流れる流体の、前記管の端部における圧力の推移の特徴から導出される前記管の内部の点における圧力の推移の特徴である第1の推移の特徴と、前記管を流れる流体の前記内部の点における圧力の推移の特徴として入力された第2の推移の特徴と、の比較に基づいて算出する、
請求項8から13のいずれか一項に記載の解析方法。 - コンピュータに、
管の劣化に応じて値が変化するパラメータを含む情報に基づく管網モデルの精度が、所定の条件を満たすかを判定する判定処理と、
前記精度が前記所定の条件を満たす場合に、前記パラメータに基づいた、前記管の劣化に関する情報を導出する導出処理と、
を実行させるプログラムを記憶する、コンピュータ読み取り可能な記憶媒体。 - コンピュータに、前記管網モデルの精度が前記所定の条件を満たさない場合に、前記パラメータの値の修正を行う修正処理をさらに実行させ、
前記修正処理は、前記判定処理が、前記修正が反映された前記管網モデルの精度が前記所定の条件を満たすと判定するまで、前記修正を繰り返す、
請求項15に記載の記憶媒体。 - 前記パラメータは、前記管を流れる流体における音速に基づくパラメータである、
請求項15または16に記載の記憶媒体。 - 前記管の劣化に関する情報は、前記管の肉厚に関する情報である、
請求項15から17のいずれか一項に記載の記憶媒体。 - 前記導出処理は、前記パラメータの値が、所定の基準を満たさない場合に、前記管が劣化していることを示す情報を出力する、
請求項15から18のいずれか一項に記載の記憶媒体。 - 前記所定の基準は、過去に前記所定の条件を満たした前記管網モデルの前記パラメータに基づく基準である、
請求項19に記載の記憶媒体。 - 前記判定処理は、前記管網モデルの精度を、前記管を流れる流体の、前記管の端部における圧力の推移の特徴から導出される前記管の内部の点における圧力の推移の特徴である第1の推移の特徴と、前記管を流れる流体の前記内部の点における圧力の推移の特徴として入力された第2の推移の特徴と、の比較に基づいて算出する、
請求項15から20のいずれか一項に記載の記憶媒体。
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