JP6834952B2 - Deterioration analyzer, deterioration analysis method and deterioration analysis program and recording medium - Google Patents

Description

The present invention relates to a deterioration analyzer and the like, for example, one that detects deterioration of a pipe such as a decrease in wall thickness and a change in material.

In recent years, a large number of pipes such as water pipes, gas pipes, and industrial pipes (for example, oil pipelines and various oil pipes in factories) have been arranged underground. As the pipe deteriorates over time, the pipe becomes brittle or the wall thickness of the pipe becomes thin. As a result, the fluid flowing in the pipe may leak to the outside of the pipe, or the pipe may burst.

For example, if a water pipe ruptures, a water outage may occur in the area surrounding the water pipe. In addition, there is a risk that the houses and roads around the water pipe will be flooded.

Further, for example, if a pipe through which a combustible material such as gas or oil flows ruptures, a fire or an explosion may occur around the pipe. In addition, the oil flowing through the pipe may flow out to the soil around the pipe, causing soil contamination.

In order to prevent these disasters, regular maintenance and inspection of pipes and regular replacement of pipes are required. For that purpose, it is necessary to grasp the deterioration state of the piping.

As a method for detecting deterioration of a pipe, in the case of a pipe that is not buried in the ground, for example, a non-destructive inspection method using an ultrasonic inspection device can be applied. On the other hand, such a non-destructive inspection method cannot be applied to pipes buried in the ground.

As a method of detecting deterioration of pipes buried in the ground, for example, a part of the soil around the pipes is removed to expose the pipes, and then the appearance is observed or the pipes are piped with an ultrasonic wall thickness gauge. There is a known method of measuring the wall thickness of the pipe. Another method is also known in which an inspection robot is placed in a pipe and the inspection robot is run in the pipe to inspect the pipe.

However, the former method has a problem that it takes a lot of time and cost to dig up the pipe from the ground. Further, in the latter method, since the inspection robot is put in the pipe, it can be applied only to the pipe having a large diameter of the pipe, and it is necessary to stop the fluid transfer during the inspection.

On the other hand, for example, in Patent Documents 1 and 2, as an example of a technique for detecting defect deterioration of a pipe, the speed of vibration (sound velocity) propagating in the pipe is measured, and the measured value and the theoretical value of the sound velocity are obtained. A technique for estimating the wall thickness of a pipe by comparison is disclosed.

Special Table 2008-544260 Japanese Unexamined Patent Publication No. 2013-61350

In the techniques described in Patent Documents 1 and 2, the wall thickness of the pipe based on the sound velocity is used by using the relational expression between the wall thickness profile in the circumferential direction of the pipe and the speed of vibration (sound velocity) propagating in the pipe. Is calculated. However, in this method, the influence of the deposits on the pipe and the earth and sand around the pipe on the sound velocity cannot be considered. As a result, there is a problem that the relationship between the actual sound velocity and the wall thickness of the pipe does not conform to the above-mentioned relational expression. That is, the methods shown in Patent Documents 1 and 2 have a problem that the wall thickness of the pipe buried in the ground cannot be calculated accurately and the deterioration of the pipe cannot be detected accurately.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a deterioration analyzer or the like capable of more accurately detecting deterioration of piping.

The deterioration analyzer of the present invention propagates the vibration frequency acquisition means for acquiring the frequency of vibration propagating in the pipe or the fluid flowing in the pipe as a measured value of the vibration frequency and the fluid flowing in the pipe or the pipe. The vibration frequency and the vibration propagation velocity are used for each of the vibration propagation velocity measuring means for measuring the vibration velocity as a measured value of the vibration propagation velocity and a plurality of models set by changing the setting parameters which are parameters related to the piping. Comparison of theoretical values and measured values of a plurality of vibration propagation velocities corresponding to a plurality of measured values of the vibration frequencies acquired by the model data calculating means for calculating the theoretical values of the above in association with each other. A model extraction means that extracts a specific model from the plurality of models based on the result, and a deterioration determination means that determines the deterioration state of the pipe based on the setting parameters corresponding to the specific model extracted by the model extraction means. And have.

In the deterioration analysis method of the present invention, the frequency of vibration propagating in a pipe or a fluid flowing in the pipe is acquired as a measured value of the vibration frequency, and the speed of vibration propagating in the pipe or the fluid flowing in the pipe is determined. It is measured as a measured value of the vibration propagation velocity, and the theoretical values of the vibration frequency and the vibration propagation velocity are calculated in association with each other for each of a plurality of models set by changing the setting parameter which is a parameter related to the piping. A specific model is extracted from the plurality of models based on the comparison results of the theoretical values and the measured values of the plurality of vibration propagation velocities corresponding to the measured values of the plurality of vibration frequencies, and the setting parameters corresponding to the specific models are set. Based on this, the deterioration state of the pipe is determined.

The storage medium of the present invention acquires the frequency of vibration propagating in a pipe or a fluid flowing in the pipe as a measured value of the vibration frequency, and vibrates the speed of vibration propagating in the pipe or the fluid flowing in the pipe. The vibration frequency and the theoretical value of the vibration propagation velocity are calculated in association with each other for each of a plurality of models set by changing the setting parameter which is a parameter related to the piping by measuring as a measurement value of the propagation velocity. Based on the comparison results of the theoretical values and the measured values of the plurality of vibration propagation velocities corresponding to the plurality of measured values of the vibration frequency acquired by the vibration frequency acquisition step, a specific model is extracted from the plurality of models, and the specific model is extracted. A deterioration analysis program that causes a computer to perform a process of determining a deterioration state of the pipe based on a setting parameter corresponding to a specific model is stored.

According to the deterioration analyzer and the like according to the present invention, deterioration of piping can be detected more accurately.

It is a figure which shows the structure of the deterioration analyzer in 1st Embodiment of this invention. It is sectional drawing of a pipe and the periphery of a pipe. It is a figure which shows an example of the specific parameter of each model. It is a figure which shows the relationship between the vibration frequency and the vibration propagation speed of each model when the setting parameter is changed. It is a figure which shows the operation flow of the deterioration analyzer in 1st Embodiment of this invention. It is a figure which shows the structure of the deterioration analyzer in the 2nd Embodiment of this invention. It is a figure which shows the structure of the deterioration analyzer in 3rd Embodiment of this invention.

<First Embodiment>
The configuration of the deterioration analyzer 100 according to the first embodiment of the present invention will be described.

FIG. 1 is a diagram showing a configuration of a deterioration analyzer 100 according to the first embodiment of the present invention.

As shown in FIG. 1, the pipe 900 is buried in the earth and sand 800 in the ground. Further, the fluid 910 (liquid or gas) is flowing in the pipe 900. In the example of FIG. 1, it is assumed that the flow is in the direction of arrow A1 on the paper of FIG. In the following description, the fluid 910 will be described as water.

As shown in FIG. 1, two fire hydrants 920 are provided in the pipe 900. Water (fluid 910) can be taken out of the pipe 900 from these fire hydrants 920. The fire hydrant 920 is arranged at the installation position of the manhole 700. The fire hydrant 920 is exposed from the underground earth and sand 800 in the manhole 700.

As shown in FIG. 1, the deterioration analyzer 100 includes a vibration exciting unit 110, a water pressure sensor 120, and a processing unit 130. The water pressure sensor 120 corresponds to the vibration detection unit of the present invention. Let D1 be the distance between the vibration exciter 110 and the water pressure sensor 120. The exciting unit 110 and the processing unit 130 are connected by wire or wireless communication. Similarly, the water pressure sensor 120 and the processing unit 130 are also connected by wire or wireless communication.

As shown in FIG. 1, the exciting portion 110 is attached to the pipe 900. More specifically, the vibrating portion 110 is attached to one of the fire hydrants 920. Further, the vibrating unit 110 is connected to the processing unit 130 by wire or wireless communication. The vibrating unit 110 vibrates the water (fluid 910) flowing in the pipe 900. In other words, the vibrating unit 110 excites vibration in the water (fluid 910) flowing in the pipe 900. The vibrating unit 110 can change the frequency to apply vibration to the water (fluid 910) flowing in the pipe 900. That is, the excitation unit 110 can change the excitation frequency. Further, the vibrating unit 110 outputs a signal synchronized with the vibration excited to the water (fluid 910) flowing in the pipe 900 to the processing unit 130. The vibrating unit 110 may be permanently installed at the installation location, or may be installed for a predetermined period of time.

As shown in FIG. 1, the water pressure sensor 120 is attached to the pipe 900. More specifically, the water pressure sensor 120 is attached to the other fire hydrant 920. Further, the water pressure sensor 120 is connected to the processing unit 130 by wire or wireless communication. The water pressure sensor 120 detects the vibration propagating in the pipe 900 and the water (fluid 910) flowing in the pipe 900 as propagating vibration. The water pressure sensor 120 puts the detected propagated vibration on the output signal and outputs it to the processing unit 130. The water pressure sensor 120 may be permanently installed at the installation location to constantly detect vibration, or may be installed for a predetermined period of time to intermittently detect vibration. As described above, the water pressure sensor 120 corresponds to the vibration detection unit of the present invention.

The vibration exciter 110 and the water pressure sensor 120 may be attached to the inner wall surface of the pipe 900. Further, the vibration excitation unit 110 and the water pressure sensor 120 may be installed on the outer surface or inside of an accessory (not shown) such as a valve plug installed in the pipe 900. As a method of installing the vibration exciting unit 110 and the water pressure sensor 120 in the pipe 900 or the accessory of the pipe 900, a method of connecting to the pipe or the water intake port installed in the accessory via a dedicated jig can be considered.

As shown in FIG. 1, the processing unit 130 is connected to the vibration exciting unit 110 and the water pressure sensor 120 by wire or wirelessly. The processing unit 130 receives the signal output by the vibration unit 110. As described above, this signal is a signal synchronized with the vibration excited by the water (fluid 910) flowing in the pipe 900. The processing unit 130 receives the propagated vibration detected by the water pressure sensor 120.

As shown in FIG. 1, the processing unit 130 includes a vibration frequency acquisition unit 131, a vibration propagation speed measurement unit 132, a model data calculation unit 133, a model extraction unit 134, and a deterioration determination unit 135. ..

As shown in FIG. 1, the vibration frequency acquisition unit 131 is provided in the processing unit 130. The vibration frequency acquisition unit 131 acquires the frequency of vibration propagating in the pipe 900 and the water (fluid 910) flowing in the pipe 900 as the vibration frequency. Specifically, the vibration frequency acquisition unit 131 acquires the frequency of vibration applied by the vibration unit 110 as the vibration frequency. Alternatively, the vibration frequency acquisition unit 131 acquires the frequency of the propagated vibration detected by the water pressure sensor 120 as the vibration frequency.

As shown in FIG. 1, the vibration propagation velocity measuring unit 132 is provided in the processing unit 130. The vibration propagation velocity measuring unit 132 measures the velocity of the vibration propagating in the pipe 900 and the water (fluid 910) flowing in the pipe 900 as the vibration propagation velocity. More specifically, the vibration propagation velocity measuring unit 132 measures the time difference between the two signals by comparing the signal from the vibrating unit 110 with the signal from the water pressure sensor 120. That is, in the vibration propagation velocity measuring unit 132, the vibration is applied to the water (fluid 910) flowing through the pipe 900 by the vibration exciting unit 110, and the propagation vibration is detected by the water pressure sensor 120. The time difference from time is measured. Then, the vibration propagation velocity measurement unit 132 determines the vibration propagation velocity based on this time difference and the distance between the two fire hydrants 920 (the same as the distance D1 between the vibration excitation unit 110 and the water pressure sensor 120). calculate. That is, the vibration propagation velocity measurement unit 132 measures the vibration propagation velocity based on the measured time difference and the distance D1 between the vibration excitation unit 110 and the water pressure sensor 120. As described above, the vibrating unit 110 can change the frequency to apply vibration to the water (fluid 910) flowing in the pipe 900. Therefore, the vibration propagation velocity measuring unit 132 measures the vibration propagation velocity for each of a plurality of vibration frequencies corresponding to the vibration frequencies changed by the vibration exciting unit 110. The vibration propagation speed is also called the speed of sound.

The model data calculation unit 133 is provided in the processing unit 130. The model data calculation unit 133 calculates the theoretical values of the vibration frequency and the vibration propagation velocity for each of the plurality of models in association with each other.

FIG. 2 is a cross-sectional view showing a model of the pipe 900 and the periphery of the pipe 900. The model shown in FIG. 2 assumes a structure that continues infinitely along the direction perpendicular to the cross section of the pipe 900. As shown in FIG. 2, the pipe 900 is buried in the earth and sand 800 in the ground. The inside of the pipe 900 is filled with water (fluid 910). Further, the deposit 940 is formed on the inner peripheral wall surface of the pipe 900.

The model data is set by associating the theoretical values of the vibration frequency and the vibration propagation speed with each other for each of a plurality of models set by changing the setting parameters. The setting parameters include, for example, parameters related to the pipe 900 (Young's modulus of the pipe, wall thickness of the pipe, Poisson's ratio, etc.), parameters related to the fluid 910 flowing through the pipe 900, parameters related to deposits adhering to the pipe 900, and piping. It is a parameter related to earth and sand around 900.

In the example shown in FIG. 3, six types of setting parameters are set. Here, only one type of setting parameter may be changed. In this case, the values are fixed except for the setting parameters to be changed.

FIG. 3 is a diagram showing an example of setting parameters of each model. FIG. 4 is a diagram showing the relationship between the vibration frequency and the vibration propagation speed of each model when the setting parameters are changed.

Regarding model 1, parameters related to pipe 900 (Young's modulus a1 of pipe, wall thickness b1 of pipe, Poisson's ratio c1), parameter d1 related to fluid 910 flowing through pipe 900, parameter e1 related to deposits adhering to pipe 900, and , The parameter f1 related to the earth and sand around the pipe 900 was set. Similarly, regarding the model 2, the parameters related to the pipe 900 (Young's modulus a2 of the pipe, the wall thickness b2 of the pipe, Poisson's ratio c2), the parameter d2 related to the fluid 910 flowing through the pipe 900, and the deposits adhering to the pipe 900 are related. It was set as parameter e2 and parameter f2 related to earth and sand around the pipe 900. Further, regarding the model 3, parameters related to the pipe 900 (Young's modulus a3 of the pipe, wall thickness b3 of the pipe, Poisson's ratio c3), parameter d3 related to the fluid 910 flowing through the pipe 900, and parameters related to deposits adhering to the pipe 900. The parameters f3 related to e3 and the earth and sand around the pipe 900 were set. Regarding model 4, parameters related to pipe 900 (Young's modulus a4 of pipe, wall thickness b4 of pipe, Poisson's ratio c4), parameter d4 related to fluid 910 flowing through pipe 900, parameter e4 related to deposits adhering to pipe 900, and , The parameter f4 related to the earth and sand around the pipe 900 was set.

For each of the models 1 to 4 shown in FIG. 3, the vertical axis represents the vibration propagation velocity and the horizontal axis represents the vibration frequency, and the relationship between the vibration frequency and the theoretical value of the vibration propagation velocity of each model is shown in FIG. The measured values 1 to 8 are shown in FIG. 4, and this point will be described later.

As shown in FIG. 4, in any of the models 1 to 4, the vibration propagation velocity changes according to the vibration frequency.

Returning to FIG. 1, the model extraction unit 134 is provided in the processing unit 130. The model extraction unit 134 selects a specific model from a plurality of models based on the theoretical values and the comparison results of the measured values of the plurality of vibration propagation velocities corresponding to the measured values of the plurality of vibration frequencies acquired by the vibration frequency acquisition unit 131. Extract. As described above, the theoretical values of the plurality of vibration propagation velocities are calculated by the model data calculation unit 133 in association with the theoretical values of the plurality of vibration frequencies. The model extraction unit 134 extracts a plurality of theoretical values of vibration propagation velocities corresponding to the measurement values of the plurality of vibration frequencies acquired by the vibration frequency acquisition unit 131 from the calculation results of the model data calculation unit 133. Then, the model extraction unit 134 compares the extracted theoretical values of the plurality of vibration propagation velocities with the measured values of the plurality of vibration propagation velocities measured by the vibration propagation velocity measuring unit 132.

Then, the model extraction unit 134 extracts a specific model from the plurality of models based on the above comparison result. More specifically, when the theoretical values and the measured values of the plurality of vibration propagation velocities are closer to each other, the model extraction unit 134 obtains a model corresponding to the theoretical values of the plurality of vibration propagation velocities from a plurality of specific models. Extract.

As shown in FIG. 1, the deterioration determination unit 135 is provided in the processing unit 130. The deterioration determination unit 135 determines the deterioration state of the pipe 900 based on the setting parameters corresponding to the specific model extracted by the model extraction unit 134.

The configuration of the deterioration analyzer 100 has been described above.

Next, the operation of the deterioration analyzer 100 according to the first embodiment of the present invention will be described.

FIG. 5 is a diagram showing an operation flow of the deterioration analyzer 100 according to the first embodiment of the present invention.

As shown in FIG. 5, first, the vibration frequency acquisition unit 131 acquires the vibration frequency (S1). Specifically, the vibration frequency acquisition unit 131 acquires the frequency of vibration propagating in the pipe 900 and the water (fluid 910) flowing in the pipe 900 as the vibration frequency. Here, the vibration frequency acquisition unit 131 acquires the frequency of vibration applied by the vibration unit 110 as the vibration frequency. Alternatively, the vibration frequency acquisition unit 131 acquires the frequency of the propagated vibration detected by the water pressure sensor 120 as the vibration frequency.

Next, as shown in FIG. 5, the vibration propagation velocity measuring unit 132 measures the vibration propagation velocity (sound velocity) (S2). Specifically, the vibration propagation velocity measuring unit 132 measures the vibration velocity propagating in the pipe 900 and the water (fluid 910) flowing in the pipe 900 as the vibration propagation velocity.

Here, the vibration propagation velocity measuring unit 132 measures the time difference between the two signals by comparing the signal from the vibrating unit 110 with the signal from the water pressure sensor 120. That is, in the vibration propagation velocity measuring unit 132, the vibration is applied to the water (fluid 910) flowing through the pipe 900 by the vibration exciting unit 110, and the propagation vibration is detected by the water pressure sensor 120. The time difference from time is measured.

Then, the vibration propagation velocity measurement unit 132 determines the vibration propagation velocity based on this time difference and the distance between the two fire hydrants 920 (the same as the distance D1 between the vibration excitation unit 110 and the water pressure sensor 120). calculate. That is, the vibration propagation velocity measurement unit 132 measures the vibration propagation velocity based on the measured time difference and the distance D1 between the vibration excitation unit 110 and the water pressure sensor 120. As described above, the vibrating unit 110 can change the frequency to apply vibration to the water (fluid 910) flowing in the pipe 900. Therefore, the vibration propagation velocity measuring unit 132 measures the vibration propagation velocity for each of a plurality of vibration frequencies corresponding to the vibration frequencies changed by the vibration exciting unit 110.

In the description of FIG. 5, it was explained that the processing of S2 is performed after the processing of S1. On the other hand, the processing of S2 may be performed before the processing of S1. Further, the processes of S1 and S2 may be performed at the same time.

Further, in S1, the vibration frequency acquisition unit 131 acquires a plurality of vibration frequencies. Then, in S2, the vibration propagation velocity measuring unit 132 may measure the vibration propagation velocity corresponding to each of the plurality of vibration frequencies acquired by the vibration frequency acquisition unit 131. FIG. 4 shows an example of the measured values.

As shown in FIG. 4, with respect to the vibration frequency and the vibration propagation velocity, the measurement values of eight points of the measured values A1 to A8 are acquired by the vibration frequency acquisition unit 131 and the vibration propagation velocity measurement unit 132.

Next, as shown in FIG. 5, the model extraction unit 134 extracts a specific model (S3). Specifically, the model extraction unit 134 has a plurality of theoretical values of vibration propagation velocities corresponding to the measured values of the plurality of vibration frequencies acquired by the vibration frequency acquisition unit 131 and a comparison result of the measured values. Extract a specific model from the model. At this time, the model data calculation unit 133 calculates the theoretical values of the vibration frequency and the vibration propagation velocity for each of the plurality of models in association with each other. The model extraction unit 134 extracts a plurality of theoretical values of vibration propagation velocities corresponding to the measurement values of the plurality of vibration frequencies acquired by the vibration frequency acquisition unit 131 from the calculation results of the model data calculation unit 133. Then, the model extraction unit 134 compares the extracted theoretical values of the plurality of vibration propagation velocities with the measured values of the plurality of vibration propagation velocities measured by the vibration propagation velocity measuring unit 132. Then, the model extraction unit 134 extracts a specific model from the plurality of models based on the above comparison result. That is, when the theoretical values and the measured values of the plurality of vibration propagation velocities are closer to each other, the model extraction unit 134 extracts the model corresponding to the theoretical values of the plurality of vibration propagation velocities from the plurality of specific models.

In the example of FIG. 4, the measured values A1 to A8 are the closest to the model 2 among the models 1 to 4. Therefore, the model extraction unit 134 extracts the model 2 as a specific model.

Next, as shown in FIG. 5, the deterioration determination unit 135 determines the deterioration state of the pipe 900 (S4). Specifically, the deterioration determination unit 135 determines the deterioration state of the pipe 900 based on the setting parameters corresponding to the specific model extracted by the model extraction unit 134.

At this time, as described above, the setting parameters include parameters related to the pipe 900 (young ratio of the pipe, wall thickness of the pipe, Poisson ratio), parameters related to the fluid 910 flowing through the pipe 900, and parameters related to deposits adhering to the pipe 900. , Parameters related to earth and sand around the pipe 900 were set. The deterioration determination unit 135 determines the deterioration state of the pipe 900 by checking each numerical value of the setting parameter corresponding to the specific model.

Generally, when the wall thickness of the pipe 900 becomes thin or the Young's modulus decreases due to deterioration of the pipe 900, the vibration propagation velocity (sound velocity) decreases. On the other hand, when deposits are accumulated inside the pipe 900 and the cross-sectional area through which water (fluid 910) passes becomes narrow, the vibration propagation velocity (sound velocity) increases. That is, these two parameters have an opposite effect on the vibration propagation velocity (sound velocity).

When the pipe 900 deteriorates due to aging of the pipe 900 and deposits are accumulated, the effects of the changes in the two parameters cancel each other out, and the vibration propagation velocity (sound velocity) may hardly change.

When comparing the measured value and the theoretical value in only one frequency band without considering the frequency dependence of the vibration propagation velocity (sound velocity), it is difficult to separate the effects due to the changes in these two parameters. On the other hand, the effect of changing the above two parameters has different frequency dependence. Therefore, it is more preferable to measure the frequency dependence of the vibration propagation velocity (sound velocity) and compare it with the theoretical value. This makes it possible to separate the effects of the conversion of the two parameters. Similarly, the characteristics of earth and sand also affect the vibration propagation velocity (sound velocity). However, by incorporating the parameters related to earth and sand into the setting parameters, this effect can be separated from the effect of changes in the characteristics of the pipe 900.

As described above, in the example of FIG. 4, the model extraction unit 134 extracted the model 2 as a specific model. As shown in FIG. 3, the setting parameters of the model 2 are the parameters related to the pipe 900 (the young ratio a2 of the pipe, the wall thickness b2 of the pipe, the Poisson's ratio c2), the parameter d2 related to the fluid 910 flowing through the pipe 900, and the inside of the pipe 900. It is set as parameter e2 regarding the deposits adhering to the pipe 900 and parameter f2 regarding the earth and sand around the pipe 900.

The deterioration determination unit 135 estimates the state of the pipe 900 based on the setting parameters of the model 2 and determines the deterioration state of the pipe 900.

The operation of the deterioration analyzer 100 according to the first embodiment of the present invention has been described above.

As described above, the deterioration analyzer 100 according to the first embodiment of the present invention includes the vibration frequency acquisition unit 131, the vibration propagation velocity measurement unit 132, the model data calculation unit 133, the model extraction unit 134, and the deterioration. It is provided with a determination unit 135. The vibration frequency acquisition unit 131 acquires the frequency of vibration propagating in the pipe 900 and the fluid 910 flowing in the pipe 900 as a measured value of the vibration frequency. The vibration propagation velocity measuring unit 132 measures the vibration velocity propagating in the pipe 900 and the fluid 910 flowing in the pipe 900 as a measured value of the vibration propagation velocity. The model data calculation unit 133 calculates the theoretical values of the vibration frequency and the vibration propagation velocity for each of a plurality of models set by changing the setting parameter which is a parameter related to the pipe 900. The model extraction unit 134 selects a specific model from a plurality of models based on the theoretical values and the comparison results of the measured values of the plurality of vibration propagation velocities corresponding to the measured values of the plurality of vibration frequencies acquired by the vibration frequency acquisition unit 131. Extract. The deterioration determination unit 135 determines the deterioration state of the pipe 900 based on the setting parameters corresponding to the specific model extracted by the model extraction unit 134.

In this way, the model data calculation unit 133 calculates the theoretical values of the vibration frequency and the vibration propagation velocity for each of the plurality of models set by changing the setting parameters which are the parameters related to the pipe 900. Then, the model extraction unit 134 identifies from a plurality of models based on the theoretical values and the comparison results of the measured values of the plurality of vibration propagation velocities corresponding to the measured values of the plurality of vibration frequencies acquired by the vibration frequency acquisition unit 131. Extract the model. That is, the model extraction unit 134 extracts a model in which a theoretical value closer to the measured value of the vibration propagation velocity is set at a plurality of vibration frequencies as a specific model. As a result, the model extraction unit 134 can estimate a model closer to the actual condition of the pipe 900 with a specific model. Further, the deterioration determination unit 135 determines the deterioration state of the pipe 900 based on the setting parameters corresponding to the specific model extracted by the model extraction unit 134. That is, the deterioration determination unit 135 can determine the presence or absence of defects in the pipe 900 by using the setting parameters corresponding to the specific model that is closer to the actual condition of the pipe 900. Therefore, according to the deterioration analyzer 100, the deterioration state of the pipe 900 can be detected more accurately.

According to the deterioration analyzer 100, for example, parameters related to the piping, parameters related to the fluid 910 flowing in the piping 900, parameters related to deposits adhering to the piping 900, and the like can be set as the setting parameters. As a result, for example, when the vibration propagation velocity (sound velocity) of the two buried pipes 910 is measured, it depends on the difference in the state (thickness and Young's modulus) of the pipe 910, or the difference in the surrounding soil and deposits. You can separate things. For example, even if the parameters related to the earth and sand around the pipe have changed, if the parameters related to the pipe 900 have not changed, it is determined that the pipe 900 has not deteriorated. The water parameter can usually be fixed using a theoretical value.

Further, in the deterioration analyzer 100 according to the first embodiment of the present invention, the setting parameter may be the Young's modulus of the pipe 900 or the wall thickness of the pipe 900.

The deterioration analyzer 100 according to the first embodiment of the present invention includes a vibration exciting unit 110 and a vibration detecting unit (water pressure sensor 120). The vibration exciting unit 110 is attached to the pipe 900. The vibrating unit 110 vibrates the fluid 910 flowing in the pipe 900. The vibration detection unit (water pressure sensor 120) detects the vibration propagating in the pipe 900 and the fluid 910 flowing in the pipe 900 as the propagating vibration. Then, the vibration propagation velocity measuring unit 132 vibrates based on the time difference between the first time described later and the second time described later, and the distance between the vibrating unit 110 and the vibration detecting unit 120. Measure the speed. The first time is the time when the vibration is applied to the fluid 910 flowing in the pipe 900 by the vibrating unit 110. The second time is the second time when the propagated vibration is detected by the vibration detection unit (water pressure sensor 120). This makes it possible to measure the vibration propagation velocity.

In the deterioration analyzer 100 according to the first embodiment of the present invention, the vibration detection unit (water pressure sensor 120) is a pressure sensor that detects the pressure of the fluid 910 flowing in the pipe 900. The vibration detection unit (water pressure sensor 120) detects the propagated vibration based on the detected pressure. This makes it possible to measure the vibration propagation velocity.

The deterioration analysis method according to the first embodiment of the present invention includes a vibration frequency acquisition step, a vibration propagation velocity measurement step, a model data calculation step, a model extraction step, and a deterioration determination step. In the vibration frequency acquisition step, the frequency of vibration propagating in the pipe 900 and the fluid 910 flowing in the pipe 900 is acquired as a measured value of the vibration frequency. In the vibration propagation velocity measurement step, the vibration velocity propagating in the pipe 900 and the fluid 910 flowing in the pipe 900 is measured as a measured value of the vibration propagation velocity. In the model data calculation step, the theoretical values of the vibration frequency and the vibration propagation velocity are calculated in association with each other for each of a plurality of models set by changing the setting parameter which is a parameter related to the pipe 900. In the model extraction step, a specific model is extracted from a plurality of models based on the theoretical values of a plurality of vibration propagation velocities corresponding to the measured values of the plurality of vibration frequencies acquired by the vibration frequency acquisition step and the comparison result of the measured values. .. In the deterioration determination step, the deterioration state of the pipe 900 is determined based on the setting parameters corresponding to the specific model extracted by the model extraction unit 134.

Even with this deterioration analysis method, the effect obtained by the deterioration analysis device 100 described above can be obtained.

Further, the deterioration analysis program according to the first embodiment of the present invention includes the above-mentioned vibration frequency acquisition step, vibration propagation velocity measurement step, model data calculation step, model extraction step, and deterioration determination step. Let the computer do it.

Even with this deterioration analysis program, the effects obtained by the deterioration analysis device 100 described above can be obtained.

Further, the storage medium according to the first embodiment of the present invention includes the above-mentioned vibration frequency acquisition step, vibration propagation velocity measurement step, model data calculation step, model extraction step, and deterioration determination step. Memorize the deterioration analysis program to be performed by the computer.

This storage medium can also exert the effects that the deterioration analyzer 100 described above can achieve.

<Second Embodiment>
The configuration of the deterioration analyzer 100A according to the second embodiment of the present invention will be described.

FIG. 6 is a diagram showing the configuration of the deterioration analyzer 100A according to the second embodiment of the present invention. In FIG. 6, the components equivalent to the components shown in FIGS. 1 to 5 are designated by the same reference numerals as those shown in FIGS. 1 to 5.

As shown in FIG. 6, the central portion of the pipe 900A is buried in the earth and sand 800 in the ground. Further, the fluid 910 (liquid or gas) is flowing in the pipe 900A. In the example of FIG. 6, it is assumed that the flow is in the direction of arrow A2 on the paper of FIG. In the following description, the fluid 910 will be described as oil.

As shown in FIG. 6, four bent portions 901 are formed in the pipe 900A. As a result, in FIG. 6, the central portion of the pipe 900A is buried in the earth and sand 800 in the ground. In FIG. 6, both ends of the pipe 900A are exposed on the ground surface.

As shown in FIG. 6, the deterioration analyzer 100A includes acceleration sensors 140a and 140b and a processing unit 130. The acceleration sensors 140a and 140b correspond to the vibration detection unit, the first vibration detection unit or the second vibration detection unit of the present invention. Let D2 be the distance between the acceleration sensor 140a and the acceleration sensor 140b. The acceleration sensor 140a and the processing unit 130 are connected by wire or wireless communication. Similarly, the acceleration sensor 140b and the processing unit 130 are also connected by wire or wireless communication.

As shown in FIG. 6, the acceleration sensors 140a and 140b are attached to the pipe 900A. More specifically, the acceleration sensor 140a is attached to the exposed portion of the right end portion of the pipe 900A in FIG. The acceleration sensor 140b is attached to the exposed portion at the left end of the pipe 900A in FIG.

The acceleration sensors 140a and 140b detect the vibration propagating in the oil (fluid 910) flowing in the pipe 900A and the pipe 900A as the propagating vibration. For example, a hammer (not shown) gives an impact to the pipe 900A. The magnitude of the impact at this time should be such that the pipe 900A is not damaged. The impact applied to the pipe 900A propagates through the pipe 900A and the oil (fluid 910) flowing in the pipe 900A, and vibrates the two acceleration sensors 140a and 140b. As a result, acceleration is applied to the acceleration sensors 140a and 140b. The acceleration sensors 140a and 140b put the detected propagated vibration on the output signal and output it to the processing unit 130. That is, the acceleration sensors 140a and 140b carry a signal corresponding to the magnitude of the acceleration as propagated vibration on the output signal and output it to the processing unit 130.

The acceleration sensors 140a and 140b may be permanently installed at the installation location to constantly detect vibration, or may be installed for a predetermined period to intermittently detect vibration. As described above, the acceleration sensors 140a and 140b correspond to the vibration detection unit, the first vibration detection unit, or the second vibration detection unit of the present invention.

Here, in the first embodiment, the fluid 910 is used as water, and the water pressure sensor 120 is used as the vibration detection unit. When this water pressure sensor 120 is used, it is necessary to bring the water pressure sensor 120 into direct contact with water (fluid 910). On the other hand, when oil is used for the fluid 910 as in the present embodiment, it is necessary to prevent the oil from permeating to the outside of the pipe 900A and preventing the oil from being heated and exploding in the pipe 900A. Therefore, when oil is used for the fluid 910, it is not preferable to use the water pressure sensor 120 which needs to be in direct contact with the fluid 910. Therefore, in the present embodiment, acceleration sensors 140a and 140b capable of detecting vibration from the outside of the pipe 900A are used as the first and second vibration detection units. This avoids the above problems that may occur when oil is used for the fluid 910.

The acceleration sensors 140a and 140b may be installed on the outer surface of a flange (not shown) installed in the pipe 900A or an accessory (not shown) such as a valve plug. As a method of installing the acceleration sensors 140a and 140b on the pipe 900A or the accessory of the pipe 900A, for example, the use of a magnet, the use of a special jig, or the use of an adhesive can be considered.

As shown in FIG. 6, the processing unit 130 is connected to each of the acceleration sensors 140a and 140b by wire or wirelessly. The processing unit 130 receives the signals output by the acceleration sensors 140a and 140b.

As shown in FIG. 6, the processing unit 130 includes a vibration frequency acquisition unit 131, a vibration propagation speed measurement unit 132, a model data calculation unit 133, a model extraction unit 134, and a deterioration determination unit 135. .. The configuration of the processing unit 130 of FIG. 6 is the same as the configuration of the processing unit 130 of FIG. However, the function of each part in the processing unit 130 of FIG. 6 may be slightly different from the function of each part in the processing unit 130 of FIG. This difference will be described in detail in the following description of the operation of the deterioration analyzer 100A.

The configuration of the deterioration analyzer 100A has been described above.

Next, the operation of the deterioration analyzer 100A according to the second embodiment of the present invention will be described. The operation flow of the deterioration analyzer 100A is the same as that in FIG. Therefore, FIG. 5 will be used to describe the deterioration analyzer 100A. The same operation as that of the deterioration analyzer 100 in the first embodiment will be briefly described.

As shown in FIG. 5, first, the vibration frequency acquisition unit 131 acquires the vibration frequency (S1). Specifically, the vibration frequency acquisition unit 131 acquires the frequency of vibration propagating in the pipe 900 and the oil (fluid 910) flowing in the pipe 900 as the vibration frequency. Here, first, the pipe 900A is impacted by a hammer (not shown). The impact applied to the pipe 900A propagates through the pipe 900A and the oil (fluid 910) flowing in the pipe 900A, and vibrates the two acceleration sensors 140a and 140b. As a result, acceleration is applied to the acceleration sensors 140a and 140b. The acceleration sensors 140a and 140b put the detected propagated vibration on the output signal and output it to the processing unit 130. That is, the acceleration sensors 140a and 140b carry a signal corresponding to the magnitude of the acceleration as propagated vibration on the output signal and output it to the processing unit 130.

The impact applied to the pipe 900A by the hammer has a continuous frequency spectrum over a wide frequency range. That is, it contains a plurality of vibration frequencies. Therefore, it is not possible to sequentially change the vibration frequency of the exciting unit 110 and measure the vibration propagation speed for each frequency, as was performed in the first embodiment. However, by using mathematical analysis such as Fourier analysis with a window or wavelet analysis, the frequency dependence of the vibration detection time can be calculated from the acceleration data of the acceleration sensors 140a and 140b. This makes it possible to obtain vibration propagation velocities corresponding to a plurality of frequency spectra. In this case, the vibration frequency acquisition unit 131 acquires the vibration frequency (S1) and the vibration propagation speed measurement unit 132 acquires the vibration propagation speed (sound velocity) (S2) at the same time.

An example of the measured value in FIG. 4 is also diverted in the present embodiment. As shown in FIG. 4, with respect to the vibration frequency and the vibration propagation velocity, the measurement values of eight points of the measured values A1 to A8 are acquired by the vibration frequency acquisition unit 131 and the vibration propagation velocity measurement unit 132.

Next, as shown in FIG. 5, the model extraction unit 134 extracts a specific model (S3). The details of the processing of S3 are the same as those of the first embodiment. Therefore, detailed description of the processing of S3 will be omitted. Here, as in the first embodiment, in the example of FIG. 6, the model extraction unit 134 extracts the model 2 as a specific model.

Next, as shown in FIG. 5, the deterioration determination unit 135 determines the deterioration state of the pipe 900 (S4). The details of the process of S4 are the same as those of the first embodiment. Therefore, detailed description of the processing of S4 will be omitted.

As described above, in the example of FIG. 4, the model extraction unit 134 extracts the model 2 as a specific model. As shown in FIG. 3, the setting parameters of the model 2 are the parameters related to the pipe 900 (young ratio a2 of the pipe, wall thickness b2 of the pipe, Poisson's ratio c2), parameter d2 related to the fluid 910 flowing through the pipe 900, and the inside of the pipe 900. It is set as a parameter e2 related to the deposits adhering to the pipe 900 and a parameter f2 related to the earth and sand around the pipe 900.

The deterioration determination unit 135 estimates the state of the pipe 900 based on the specific parameter of the model 2 and determines whether or not the pipe 900 is defective.

The operation of the deterioration analyzer 100A according to the second embodiment of the present invention has been described above.

As described above, the deterioration analyzer 100A according to the second embodiment of the present invention includes acceleration sensors 140a and 140b (first and second vibration detection units). The acceleration sensors 140a and 140b are attached to the pipe 900A. The acceleration sensors 140a and 140b detect the vibration propagating in the pipe 900A and the fluid flowing in the pipe 900A as the propagating vibration. The vibration propagation velocity measuring unit 132 measures the vibration propagation velocity based on the time difference between the time when the propagation vibration is detected by the acceleration sensor 140a and the time when the propagation vibration is detected by the acceleration sensor 140b and the distance D2. To do. The distance D2 is the distance between the acceleration sensor 140a and the acceleration sensor 140b. Even with such a configuration, the vibration propagation velocity can be measured.

Further, in the deterioration analyzer 100A according to the second embodiment of the present invention, the acceleration sensors 140a and 140b (first and second vibration detection units) detect the acceleration of the fluid flowing in the pipe 900A and the pipe 900A. It is an acceleration sensor. The acceleration sensors 140a and 140b detect the propagated vibration based on the detected acceleration. Even with such a configuration, the propagated vibration can be detected.

<Third embodiment>
The configuration of the deterioration analyzer 100B according to the third embodiment of the present invention will be described.

FIG. 7 is a diagram showing the configuration of the deterioration analyzer 100B according to the third embodiment of the present invention. In FIG. 7, the components equivalent to the components shown in FIGS. 1 to 6 are designated by the same reference numerals as those shown in FIGS. 1 to 6.

As shown in FIG. 7, the pipe 900B is buried in the earth and sand 800 in the ground. Further, the fluid 910 (liquid or gas) is flowing in the pipe 900B. In the example of FIG. 7, it is assumed that the flow is in the direction of arrow A3 on the paper of FIG. 7. In the following description, the fluid 910 will be described as water.

As shown in FIG. 7, two fire hydrants 920 are provided in the pipe 900. The fire hydrant 920 is arranged at the installation position of the manhole 700. The fire hydrant 920 is exposed from the underground earth and sand 800 in the manhole 700.

Of the two fire hydrants 920, the fire hydrant 920 on the right side of FIG. 7 is provided with a discharge port 950. The discharge port 950 is an opening provided in the fire hydrant 920. Water (fluid 910) can be taken out of the pipe 900B from the discharge port 950.

Further, of the two fire hydrants 920, a solenoid valve 960 is attached to the fire hydrant 920 on the right side of FIG. 7. More specifically, the solenoid valve 960 is provided between the fire hydrant 920 and the discharge port 950. The solenoid valve 960 is opened and closed by a signal from the outside.

Further, of the two fire hydrants 920, the acceleration sensor 140 is further attached to the fire hydrant 920 on the right side of FIG. 7. The acceleration sensor 140 is connected to the processing unit 130 by wire or wireless communication.

As shown in FIG. 7, the deterioration analyzer 100B includes a water pressure sensor 120, an acceleration sensor 140, and a processing unit 130. The water pressure sensor 120 and the acceleration sensor 140 correspond to the vibration detection unit, the first vibration detection unit, or the second vibration detection unit of the present invention.

Let D3 be the distance between the water pressure sensor 120 and the acceleration sensor 140. The water pressure sensor 120 and the processing unit 130 are connected by wire or wireless communication. Similarly, the acceleration sensor 140 and the processing unit 130 are also connected by wire or wireless communication.

As shown in FIG. 7, the water pressure sensor 120 and the acceleration sensor 140 are attached to the pipe 900B. More specifically, the water pressure sensor 120 is attached to the fire hydrant 920 on the right side of the pipe 900B in FIG. 7. The acceleration sensor 140 is attached to the fire hydrant 920 on the left side of the pipe 900B in FIG. 7.

The water pressure sensor 120 and the acceleration sensor 140 detect the vibration propagating in the water (fluid 910) flowing in the pipe 900B and the pipe 900B as the propagating vibration.

For example, the open / closed state of the solenoid valve 960 is changed rapidly. That is, the solenoid valve 960 is suddenly changed from open to closed or from closed to open. As a result, the flow of water (fluid 910) discharged from the discharge port 950 changes abruptly. As a result, the vibration propagates to the water pressure sensor 120 and the acceleration sensor 140 via the water (fluid 910) flowing in the pipe 900B and the pipe 900B. As a result, vibration is applied to the water pressure sensor 120 and the acceleration sensor 140. Then, the water pressure sensor 120 and the acceleration sensor 140 detect this vibration as propagated vibration. Further, the water pressure sensor 120 and the acceleration sensor 140 put the detected propagation vibration on the output signal and output it to the processing unit 130. That is, the water pressure sensor 120 and the acceleration sensor 140 superimpose the signal corresponding to the magnitude of the vibration as the propagated vibration on the output signal and output it to the processing unit 130.

The water pressure sensor 120 and the acceleration sensor 140 may be permanently installed at the installation location to constantly detect vibrations, or may be installed for a predetermined period of time to intermittently detect vibrations. As described above, the water pressure sensor 120 and the acceleration sensor 140 correspond to the vibration detection unit, the first vibration detection unit, or the second vibration detection unit of the present invention.

As shown in FIG. 7, the processing unit 130 is connected to each of the water pressure sensor 120 and the acceleration sensor 140 by wire or wirelessly. The processing unit 130 receives the signals output by the water pressure sensor 120 and the acceleration sensor 140.

As shown in FIG. 7, the processing unit 130 includes a vibration frequency acquisition unit 131, a vibration propagation speed measurement unit 132, a model data calculation unit 133, a model extraction unit 134, and a deterioration determination unit 135. .. The configuration of the processing unit 130 of FIG. 7 is the same as the configuration of the processing unit 130 of FIG. However, the function of each part in the processing unit 130 of FIG. 7 may be slightly different from the function of each part in the processing unit 130 of FIG. This difference will be described in detail in the following description of the operation of the deterioration analyzer 100B.

The configuration of the deterioration analyzer 100B has been described above.

Next, the operation of the deterioration analyzer 100B according to the third embodiment of the present invention will be described. The operation flow of the deterioration analyzer 100B is the same as that in FIG. Therefore, the deterioration analyzer 100B will be described with reference to FIG. The same operation as that of the deterioration analyzer 100 in the first embodiment will not be described.

In relation to the processing of S1 and S2, here, first, the open / closed state of the solenoid valve 960 is suddenly changed. That is, the solenoid valve 960 is suddenly changed from open to closed or from closed to open. As a result, the flow of water (fluid 910) discharged from the discharge port 950 changes abruptly. As a result, vibration is generated and propagates to the water (fluid 910) flowing in the pipe 900B and the pipe 900B. As a result, vibration is applied to the water pressure sensor 120 and the acceleration sensor 140.

Then, the water pressure sensor 120 and the acceleration sensor 140 detect this vibration as propagated vibration. Further, the water pressure sensor 120 and the acceleration sensor 140 put the detected propagation vibration on the output signal and output it to the processing unit 130. That is, the water pressure sensor 120 and the acceleration sensor 140 superimpose the signal corresponding to the magnitude of the vibration as the propagated vibration on the output signal and output it to the processing unit 130.

Due to a sudden change in the flow of water (fluid 910) discharged from the discharge port 950, vibration having a continuous frequency spectrum in water is similar to the case of vibration with a hammer described in the second embodiment. Is excited. Therefore, here as well, the frequency dependence of the vibration detection time is calculated from the data of the hydraulic pressure sensor 120 and the acceleration sensor 140 by mathematical analysis as in the second embodiment, and the vibration propagation speed corresponding to a plurality of frequency spectra is calculated. To get.

An example of the measured value in FIG. 4 is also diverted in the present embodiment. As shown in FIG. 4, with respect to the vibration frequency and the vibration propagation velocity, the measurement values of eight points of the measured values A1 to A8 are acquired by the vibration frequency acquisition unit 131 and the vibration propagation velocity measurement unit 132.

In S3, as shown in FIG. 5, the model extraction unit 134 extracts a specific model (S3). The details of the processing of S3 are the same as those of the first embodiment. Therefore, detailed description of the processing of S3 will be omitted. Here, as in the first embodiment, in the example of FIG. 6, the model extraction unit 134 extracts the model 2 as a specific model.

Next, as shown in FIG. 5, the deterioration determination unit 135 determines the deterioration of the pipe 900B (S4). The details of the process of S4 are the same as those of the first embodiment. Therefore, detailed description of the processing of S4 will be omitted.

As described above, in the example of FIG. 4, the model extraction unit 134 extracted the model 2 as a specific model. As shown in FIG. 3, the specific parameters of the model 2 are the parameters related to the pipe 900B (the young ratio a2 of the pipe, the wall thickness b2 of the pipe, the Poisson's ratio c2), the parameter d2 related to the fluid 910 flowing through the pipe 900B, and the inside of the pipe 900. Parameter e2 related to the deposits adhering to the pipe 900B and parameter f2 related to the earth and sand around the pipe 900B are set.

The deterioration determination unit 135 estimates the state of the pipe 900B based on the specific parameter of the model 2 and determines the deterioration state of the pipe 900B.

Here, in the present embodiment, unlike the first embodiment, the exciter 110 capable of changing the vibration frequency is not used. Therefore, the configuration of the deterioration analysis device 100B in the present embodiment can be simplified as compared with the deterioration analysis device 100 in the first embodiment. Further, in the second embodiment, a hammer (not shown) was used to indirectly excite the vibration to the fluid 910. On the other hand, in the present embodiment, unlike the second embodiment, the vibration can be directly excited by water (fluid 910). Therefore, in the deterioration analyzer 100B of the present embodiment, the load on the pipe 900B can be suppressed as compared with the second embodiment, and strong vibration that can be propagated over a long distance can be transmitted to the fluid 910. Can be caused.

The operation of the deterioration analyzer 100B according to the third embodiment of the present invention has been described above.

As described above, in the deterioration analyzer 100B according to the third embodiment of the present invention, the acceleration sensor 140 (vibration detection unit) is an acceleration sensor that detects the acceleration of the pipe 900B. The acceleration sensor 140 detects the propagated vibration based on the detected acceleration. Even with such a configuration, the propagated vibration can be detected.

Further, in the deterioration analyzer 100B according to the third embodiment of the present invention, the water pressure sensor 120 (vibration detection unit) is a pressure sensor that detects the pressure of the fluid flowing in the pipe 900B. The water pressure sensor 120 detects the propagated vibration based on the detected pressure. Even with such a configuration, the propagated vibration can be detected.

In the above embodiment, a water pressure sensor and an acceleration sensor are used as the vibration detection unit. However, the vibration is not limited to this, and vibration may be detected by using a type of sensor other than the water pressure sensor and the acceleration sensor.

For example, in each embodiment, the vibration frequency acquisition unit 131, the vibration propagation velocity measurement unit 132, the model data calculation unit 133, the model extraction unit 134, and the deterioration determination unit 135 are written as if they are in the same place. .. However, these configurations may be provided at different locations and may be connected by wire or wirelessly between them. For example, the vibration frequency acquisition unit 131 and the vibration propagation velocity measurement unit 132 are installed near the pipe 900 to be measured, and the model data calculation unit 133, the model extraction unit 134, and the deterioration determination unit 135 are placed indoors away from the pipe 900. It may be installed and these may be connected by a wired or wireless network.

In FIG. 3, parameters related to deposits and earth and sand are illustrated by one symbol, but this does not necessarily mean that each parameter is one. For example, the parameters for deposits can consist of deposit thickness, Young's modulus, Poisson's ratio, and so on. Further, in each embodiment, it was explained that the frequency dependence of the vibration propagation velocity (sound velocity) is calculated for a plurality of parameter sets and the one closest to the measured value is selected. However, in general, an initial value of each parameter is given to a certain calculation model, and the calculation is repeated while changing the parameter so that the measured value and the calculated value best match each other. Such a technique can be applied.

Further, in each embodiment, a pressure sensor is used to measure the vibration of the fluid, but the pressure sensor is not limited to the one capable of measuring static water pressure, and includes a hydrophone and the like.

Further, a part or all of the above-mentioned first to third embodiments may be described as follows, but is not limited to the following.
(Appendix 1)
A vibration frequency acquisition unit that acquires the frequency of vibration propagating in a pipe or a fluid flowing in the pipe as a measured value of the vibration frequency.
A vibration propagation speed measuring unit that measures the speed of vibration propagating in the pipe or the fluid flowing in the pipe as a measured value of the vibration propagation speed.
A model data calculation unit that calculates the theoretical values of the vibration frequency and the vibration propagation velocity for each of a plurality of models set by changing the setting parameters that are parameters related to the piping.
A model that extracts a specific model from the plurality of models based on the comparison results of the theoretical values and the measured values of the plurality of vibration propagation velocities corresponding to the plurality of measured values of the vibration frequencies acquired by the vibration frequency acquisition unit. Extractor and
A deterioration analyzer including a deterioration determination unit that determines a deterioration state of the pipe based on a setting parameter corresponding to a specific model extracted by the model extraction unit.
(Appendix 2)
The deterioration analyzer according to Appendix 1, wherein the setting parameter is the Young's modulus of the pipe or the wall thickness of the pipe.
(Appendix 3)
The deterioration analyzer according to Appendix 1 or 2, wherein the setting parameter includes a parameter relating to a fluid flowing in the pipe.
(Appendix 4)
The deterioration analyzer according to any one of Items 1 to 3, wherein the setting parameter includes a parameter relating to deposits adhering to the pipe.
(Appendix 5)
The deterioration analyzer according to any one of Supplementary note 1 to 4, wherein the setting parameter includes a parameter relating to earth and sand around the pipe.
(Appendix 6)
A vibration detecting unit attached to the pipe and applying vibration to the pipe or a fluid flowing in the pipe, and a vibration detecting unit for detecting vibration propagating in the pipe or the fluid flowing in the pipe as propagating vibration are provided.
In the vibration propagation velocity measuring unit, the time difference between the time when the vibration is applied to the pipe or the fluid flowing in the pipe by the vibration unit and the time when the propagated vibration is detected by the vibration detecting unit. The deterioration analyzer according to any one of Supplementary note 1 to 5, wherein the vibration propagation velocity is measured based on the distance between the vibration detecting unit and the vibration detecting unit.
(Appendix 7)
It is provided with first and second vibration detection units attached to the pipe and detecting vibration propagating to the pipe or a fluid flowing in the pipe as propagating vibration.
The vibration propagation velocity measuring unit has a time difference between the time when the propagated vibration is detected by the first vibration detecting unit and the time when the propagated vibration is detected by the second vibration detecting unit, and the above. The deterioration analyzer according to any one of Appendix 1 to 5, wherein the vibration propagation velocity is measured based on the distance between the first and the second vibration detection units.
(Appendix 8)
The deterioration analyzer according to Appendix 6, wherein the vibration detection unit is an acceleration sensor that detects the acceleration of the pipe or the fluid flowing in the pipe, and detects the propagated vibration based on the detected acceleration.
(Appendix 9)
The deterioration analyzer according to Appendix 6, wherein the vibration detection unit is a pressure sensor that detects the pressure of the pipe or the fluid flowing in the pipe, and detects the propagated vibration based on the detected pressure.
(Appendix 10)
The first or second vibration detection unit is an acceleration sensor that detects the acceleration of the pipe or the fluid flowing in the pipe, and is described in Appendix 7 that detects the propagated vibration based on the detected acceleration. Deterioration analyzer.
(Appendix 11)
The first or second vibration detection unit is a pressure sensor that detects the pressure of the pipe or the fluid flowing in the pipe, and detects the propagated vibration based on the detected pressure. The degradation analyzer described.
(Appendix 12)
A vibration frequency acquisition step for acquiring the frequency of vibration propagating in a pipe or a fluid flowing in the pipe as a measured value of the vibration frequency,
A vibration propagation velocity measurement step for measuring the vibration velocity propagating in the pipe or the fluid flowing in the pipe as a measured value of the vibration propagation velocity,
A model data calculation step for calculating the theoretical values of the vibration frequency and the vibration propagation velocity for each of a plurality of models set by changing the setting parameters which are parameters related to the piping.
A model that extracts a specific model from the plurality of models based on the comparison results of the theoretical values and the measured values of the plurality of vibration propagation velocities corresponding to the plurality of measured values of the vibration frequencies acquired by the vibration frequency acquisition step. Extraction steps and
A deterioration analysis method including a deterioration determination step for determining a deterioration state of the pipe based on a setting parameter corresponding to a specific model extracted by the model extraction step.
(Appendix 13)
A vibration frequency acquisition step for acquiring the frequency of vibration propagating in a pipe or a fluid flowing in the pipe as a measured value of the vibration frequency,
A vibration propagation velocity measurement step for measuring the vibration velocity propagating in the pipe or the fluid flowing in the pipe as a measured value of the vibration propagation velocity,
A model data calculation step for calculating the theoretical values of the vibration frequency and the vibration propagation velocity for each of a plurality of models set by changing the setting parameters which are parameters related to the piping.
A model that extracts a specific model from the plurality of models based on the comparison results of the theoretical values and the measured values of the plurality of vibration propagation velocities corresponding to the plurality of measured values of the vibration frequencies acquired by the vibration frequency acquisition step. Extraction steps and
A deterioration analysis program that causes a computer to perform a process including a deterioration determination step for determining a deterioration state of the pipe based on a setting parameter corresponding to a specific model extracted by the model extraction step.
(Appendix 14)
A vibration frequency acquisition step for acquiring the frequency of vibration propagating in a pipe or a fluid flowing in the pipe as a measured value of the vibration frequency,
A vibration propagation velocity measurement step for measuring the vibration velocity propagating in the pipe or the fluid flowing in the pipe as a measured value of the vibration propagation velocity,
A model data calculation step for calculating the theoretical values of the vibration frequency and the vibration propagation velocity for each of a plurality of models set by changing the setting parameters which are parameters related to the piping.
A model that extracts a specific model from the plurality of models based on the comparison results of the theoretical values and the measured values of the plurality of vibration propagation velocities corresponding to the plurality of measured values of the vibration frequencies acquired by the vibration frequency acquisition step. Extraction steps and
A storage medium for storing a deterioration analysis program that causes a computer to perform a process including a deterioration determination step for determining a deterioration state of the pipe based on a setting parameter corresponding to a specific model extracted by the model extraction step.

(Appendix 15)
A vibration frequency acquisition means for acquiring the frequency of vibration propagating in a pipe or a fluid flowing in the pipe as a measured value of the vibration frequency.
A vibration propagation velocity measuring means for measuring the vibration velocity propagating in the pipe or the fluid flowing in the pipe as a measured value of the vibration propagation velocity.
A model data calculation means for calculating the theoretical values of the vibration frequency and the vibration propagation velocity for each of a plurality of models set by changing the setting parameters which are parameters related to the piping.
A model that extracts a specific model from the plurality of models based on the comparison results of the theoretical values and the measured values of the plurality of vibration propagation velocities corresponding to the plurality of measured values of the vibration frequencies acquired by the vibration frequency acquisition means. Extraction means and
A deterioration analyzer provided with a deterioration determination means for determining a deterioration state of the pipe based on a setting parameter corresponding to a specific model extracted by the model extraction means.
(Appendix 16)
The deterioration analyzer according to Appendix 15, wherein the setting parameter is the Young's modulus of the pipe or the wall thickness of the pipe.
(Appendix 17)
The deterioration analyzer according to Appendix 15 or 16, wherein the setting parameter includes a parameter relating to a fluid flowing in the pipe.
(Appendix 18)
The deterioration analyzer according to any one of Supplementary note 15 to 17, wherein the setting parameter includes a parameter relating to deposits adhering to the pipe.
(Appendix 19)
The deterioration analyzer according to any one of Supplementary note 15 to 18, wherein the setting parameter includes a parameter relating to earth and sand around the pipe.
(Appendix 20)
A vibration detecting means attached to the pipe and applying vibration to the pipe or a fluid flowing in the pipe, and a vibration detecting means for detecting the vibration propagating in the pipe or the fluid flowing in the pipe as propagating vibration are provided.
In the vibration propagation velocity measuring means, the time difference between the time when the vibration is applied to the pipe or the fluid flowing in the pipe by the vibration means and the time when the propagated vibration is detected by the vibration detecting means. The deterioration analyzer according to any one of Appendix 15 to 19, wherein the vibration propagation velocity is measured based on the distance between the vibrating means and the vibration detecting means.
(Appendix 21)
A first and second vibration detecting means attached to the pipe and detecting vibration propagating to the pipe or a fluid flowing in the pipe as propagated vibration are provided.
The vibration propagation velocity measuring means has a time difference between the time when the propagated vibration is detected by the first vibration detecting means and the time when the propagated vibration is detected by the second vibration detecting means, and the above. The deterioration analyzer according to any one of Appendix 15 to 19, which measures the vibration propagation velocity based on the distance between the first and the second vibration detecting means.
(Appendix 22)
The deterioration analyzer according to Appendix 20, wherein the vibration detecting means is an acceleration sensor that detects the acceleration of the pipe or a fluid flowing in the pipe, and detects the propagated vibration based on the detected acceleration.
(Appendix 23)
The deterioration analyzer according to Appendix 20, wherein the vibration detecting means is a pressure sensor that detects the pressure of the pipe or a fluid flowing in the pipe, and detects the propagated vibration based on the detected pressure.
(Appendix 24)
The first or second vibration detecting means is an acceleration sensor that detects the acceleration of the pipe or the fluid flowing in the pipe, and is described in Appendix 21 that detects the propagated vibration based on the detected acceleration. Deterioration analyzer.
(Appendix 25)
The first or second vibration detecting means is a pressure sensor that detects the pressure of the pipe or the fluid flowing in the pipe, and the appendix 21 that detects the propagated vibration based on the detected pressure. The degradation analyzer described.
(Appendix 26)
The frequency of vibration propagating in the pipe or the fluid flowing in the pipe is acquired as a measured value of the vibration frequency.
The velocity of vibration propagating in the pipe or the fluid flowing in the pipe is measured as a measured value of the vibration propagation velocity.
The theoretical values of the vibration frequency and the vibration propagation velocity are calculated in association with each other for each of a plurality of models set by changing the setting parameters which are parameters related to the piping.
A specific model is extracted from the plurality of models based on the comparison results of the theoretical values and the measured values of the plurality of vibration propagation velocities corresponding to the measured values of the plurality of vibration frequencies.
A deterioration analysis method for determining a deterioration state of the pipe based on a setting parameter corresponding to the specific model.
(Appendix 27)
The frequency of vibration propagating in the pipe or the fluid flowing in the pipe is acquired as a measured value of the vibration frequency.
The velocity of vibration propagating in the pipe or the fluid flowing in the pipe is measured as a measured value of the vibration propagation velocity.
The theoretical values of the vibration frequency and the vibration propagation velocity are calculated in association with each other for each of a plurality of models set by changing the setting parameters which are parameters related to the piping.
A specific model is extracted from the plurality of models based on the comparison results of the theoretical values and the measured values of the plurality of vibration propagation velocities corresponding to the plurality of measured values of the vibration frequencies acquired by the vibration frequency acquisition step.
A deterioration analysis program that causes a computer to perform a process of determining a deterioration state of the pipe based on a setting parameter corresponding to the specific model.
(Appendix 28)
The frequency of vibration propagating in the pipe or the fluid flowing in the pipe is acquired as a measured value of the vibration frequency.
The velocity of vibration propagating in the pipe or the fluid flowing in the pipe is measured as a measured value of the vibration propagation velocity.
The theoretical values of the vibration frequency and the vibration propagation velocity are calculated in association with each other for each of a plurality of models set by changing the setting parameters which are parameters related to the piping.
A specific model is extracted from the plurality of models based on the comparison results of the theoretical values and the measured values of the plurality of vibration propagation velocities corresponding to the plurality of measured values of the vibration frequencies acquired by the vibration frequency acquisition step.
A storage medium for storing a deterioration analysis program that causes a computer to perform a process of determining a deterioration state of the pipe based on a setting parameter corresponding to the specific model.

Although the invention of the present application has been described above with reference to the embodiments (and examples), the invention of the present application is not limited to the above-described embodiments (and examples). Various changes that can be understood by those skilled in the art can be made within the scope of the present invention in terms of the structure and details of the present invention.

This application claims priority on the basis of Japanese application Japanese Patent Application No. 2015-109697 filed on May 29, 2015, and the entire disclosure thereof is incorporated herein by reference.

100, 100A, 100B Deterioration analyzer 110 Vibration unit 120 Water pressure sensor 130 Processing unit 131 Vibration frequency acquisition unit 132 Vibration propagation speed measurement unit 133 Model data calculation unit 134 Model extraction unit 135 Deterioration judgment unit 140, 140a, 140b Accelerometer 700 Manhole 900, 900A, 900B Piping 901 Bending part 910 Fluid 920 Fire hydrant 940 Adhesion 950 Discharge port 960 Solenoid valve

Claims (8)

A vibration frequency acquisition means for acquiring the frequency of vibration propagating in a pipe or a fluid flowing in the pipe as a measured value of the vibration frequency.
A vibration propagation velocity measuring means for measuring the vibration velocity propagating in the pipe or the fluid flowing in the pipe as a measured value of the vibration propagation velocity.
A model data calculation means for calculating the theoretical values of the vibration frequency and the vibration propagation velocity for each of a plurality of models set by changing the setting parameters which are parameters related to the piping.
A model that extracts a specific model from the plurality of models based on the comparison results of the theoretical values and the measured values of the plurality of vibration propagation velocities corresponding to the plurality of measured values of the vibration frequencies acquired by the vibration frequency acquisition means. Extraction means and
It is provided with a deterioration determination means for determining a deterioration state of the pipe based on a setting parameter corresponding to a specific model extracted by the model extraction means.
The setting parameter includes a parameter relating to earth and sand around the pipe.
Deterioration analyzer. The deterioration analyzer according to claim 1, wherein the setting parameter is the Young's modulus of the pipe or the wall thickness of the pipe. The deterioration analyzer according to claim 1 or 2, wherein the setting parameter includes a parameter relating to a fluid flowing in the pipe. The deterioration analyzer according to any one of claims 1 to 3, wherein the setting parameter includes a parameter relating to deposits adhering to the pipe. A vibration detecting means attached to the pipe and applying vibration to the pipe or a fluid flowing in the pipe, and a vibration detecting means for detecting the vibration propagating in the pipe or the fluid flowing in the pipe as propagating vibration are provided.
In the vibration propagation velocity measuring means, the time difference between the time when the vibration is applied to the pipe or the fluid flowing in the pipe by the vibration means and the time when the propagated vibration is detected by the vibration detecting means. The deterioration analyzer according to any one of claims 1 to 4 , wherein the vibration propagation velocity is measured based on the distance between the vibration means and the vibration detecting means. A first and second vibration detecting means attached to the pipe and detecting vibration propagating to the pipe or a fluid flowing in the pipe as propagated vibration are provided.
The vibration propagation velocity measuring means has a time difference between the time when the propagated vibration is detected by the first vibration detecting means and the time when the propagated vibration is detected by the second vibration detecting means, and the above. The deterioration analyzer according to any one of claims 1 to 4 , wherein the vibration propagation velocity is measured based on the distance between the first and the second vibration detecting means. The frequency of vibration propagating in the pipe or the fluid flowing in the pipe is acquired as a measured value of the vibration frequency.
The velocity of vibration propagating in the pipe or the fluid flowing in the pipe is measured as a measured value of the vibration propagation velocity.
The theoretical values of the vibration frequency and the vibration propagation velocity are calculated in association with each other for each of a plurality of models set by changing the setting parameters which are parameters related to the piping.
A specific model is extracted from the plurality of models based on the comparison results of the theoretical values and the measured values of the plurality of vibration propagation velocities corresponding to the measured values of the plurality of vibration frequencies.
Based on the setting parameters corresponding to the specific model, the deterioration state of the pipe is determined .
The setting parameter includes a parameter relating to earth and sand around the pipe.
Deterioration analysis method. The frequency of vibration propagating in the pipe or the fluid flowing in the pipe is acquired as a measured value of the vibration frequency.
The velocity of vibration propagating in the pipe or the fluid flowing in the pipe is measured as a measured value of the vibration propagation velocity.
The theoretical values of the vibration frequency and the vibration propagation velocity are calculated in association with each other for each of a plurality of models set by changing the setting parameters which are parameters related to the piping.
A specific model is extracted from the plurality of models based on the comparison results of the theoretical values and the measured values of the plurality of vibration propagation velocities corresponding to the measured values of the plurality of vibration frequencies.
A computer is made to perform a process of determining the deterioration state of the pipe based on the setting parameters corresponding to the specific model.
The setting parameter includes a parameter relating to earth and sand around the pipe.
Deterioration analysis program.

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