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WO2015146109A1 - Dispositif d'analyse de défaut, procédé d'analyse de défaut, et support de stockage - Google Patents

Dispositif d'analyse de défaut, procédé d'analyse de défaut, et support de stockage Download PDF

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Publication number
WO2015146109A1
WO2015146109A1 PCT/JP2015/001584 JP2015001584W WO2015146109A1 WO 2015146109 A1 WO2015146109 A1 WO 2015146109A1 JP 2015001584 W JP2015001584 W JP 2015001584W WO 2015146109 A1 WO2015146109 A1 WO 2015146109A1
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WIPO (PCT)
Prior art keywords
vibration
pipe
fluid
changing
flow
Prior art date
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Ceased
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PCT/JP2015/001584
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English (en)
Japanese (ja)
Inventor
裕文 井上
慎 冨永
尚武 高橋
純一郎 又賀
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NEC Corp
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NEC Corp
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Priority to JP2016510013A priority Critical patent/JPWO2015146109A1/ja
Publication of WO2015146109A1 publication Critical patent/WO2015146109A1/fr
Anticipated expiration legal-status Critical
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00—Investigating fluid-tightness of structures
    • G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
    • G01M3/24—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using infrasonic, sonic, or ultrasonic vibrations
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00—Investigating fluid-tightness of structures
    • G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
    • G01M3/24—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using infrasonic, sonic, or ultrasonic vibrations
    • G01M3/243—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using infrasonic, sonic, or ultrasonic vibrations for pipes

Definitions

  • the present invention relates to a defect analyzer and the like, for example, to a device for detecting a position where a fluid leaks from a pipe.
  • a leakage inspection by a correlation method As a method for inspecting the leakage of fluid from piping, for example, a leakage inspection by a correlation method is known.
  • a pair of vibration sensors are arranged on the pipe at a predetermined distance so as to sandwich the defective portion on both sides. Vibration sound (leakage vibration) caused by leakage propagates through the pipe. The time for the vibration sound generated by this leakage to reach each of the pair of vibration sensors is measured. Then, the fluid leakage position is estimated from the product of the difference between the two measured values of the vibration arrival time (vibration arrival time difference) and the sound velocity.
  • the cross-correlation function of the time series data is calculated, and the time corresponding to the maximum value of the function is used.
  • Patent Document 1 discloses that the frequency spectrum of the power spectrum of the leakage vibration that fluctuates when the pressure of the fluid is changed, and the signal detected in the frequency band is subjected to correlation processing, thereby leaking.
  • a technique for specifying a position is disclosed.
  • the present invention has been made in view of such circumstances, and an object of the present invention is to provide a defect analysis apparatus capable of more accurately detecting a fluid leakage position of a pipe.
  • the defect analysis apparatus includes: a vibration changing unit that changes a vibration that propagates through the pipe or the fluid by changing characteristics related to a flow vibration that is a vibration caused by a flow of the fluid flowing through the pipe; and the vibration change.
  • a pair of vibration detecting means for detecting vibrations in change which are vibrations propagating through the pipe or the fluid flowing in the pipe while being changed by the means, and the change detected by the pair of vibration detecting means.
  • Leakage position specifying calculation means for calculating a fluid leakage position, which is a position where the fluid is leaking from the pipe, based on internal vibrations.
  • the control device of the present invention outputs a vibration change instruction signal for changing the vibration propagating through the pipe or the fluid by changing the characteristics relating to the flow vibration, which is vibration generated by the flow of the fluid flowing through the pipe, An input of a vibration detection signal when detecting a changing vibration that is a vibration propagating through the pipe or a fluid flowing in the pipe while changing based on a vibration change instruction signal is received.
  • a fluid leakage position calculation instruction signal for calculating a fluid leakage position, which is a position where the fluid is leaking from the pipe, is output based on the vibration that is included.
  • the defect analysis method changes the vibration related to flow vibration, which is vibration generated by the flow of the fluid flowing in the pipe, thereby changing the vibration propagating the pipe or the fluid and propagating the pipe or the fluid. While the vibration to be changed is changing, the vibration in the change that is the vibration propagating through the pipe or the fluid flowing in the pipe is detected, and the fluid flows from the pipe based on the detection result of the vibration in the change.
  • the fluid leak position which is the leaking position, is calculated.
  • the storage medium of the present invention changes the vibration related to the flow vibration, which is vibration generated by the flow of the fluid flowing in the pipe, thereby changing the vibration propagating the pipe or the fluid and propagating the pipe or the fluid. While the vibration is changing, the vibration in the change that is the vibration that propagates the pipe or the fluid flowing in the pipe is detected, and the fluid leaks from the pipe based on the detection result of the vibration in the change.
  • a program for causing a computer to perform processing for calculating a fluid leakage position, which is a position where the fluid is leaking, is stored.
  • the fluid leakage position of the pipe can be detected more accurately.
  • fluid flow vibration in the case where fluid flow vibration flowing in a pipe is steady will be described. It is an example of a cross-correlation function when the flow vibration of the fluid flowing in the pipe is steady. An example of fluid flow vibration when the flow vibration of the fluid flowing in the pipe is unsteady (the frequency varies) will be described. It is an example of a cross-correlation function when the flow vibration of the fluid flowing in the pipe is unsteady (frequency varies). An example of fluid flow vibration when the flow vibration of the fluid flowing in the pipe is unsteady (amplitude varies) will be described. It is an example of a cross-correlation function when the flow vibration of a fluid flowing in a pipe is unsteady (amplitude varies).
  • FIG. 1 is a conceptual diagram of the defect analysis apparatus 100 according to the first embodiment of the present invention.
  • the defect analysis apparatus 100 includes at least a first vibration detection unit 110 ⁇ / b> A, a second vibration detection unit 110 ⁇ / b> B, a vibration change unit 120, and a leakage position specification calculation unit 134.
  • the leakage position specifying calculation unit 134 is provided in the processing unit 130.
  • the communication between the vibration changing unit 120 and the processing unit 130 is wired or wirelessly connected.
  • the first and second vibration detection units 110A and 110B and the processing unit 130 are connected to each other by wired or wireless communication.
  • the first vibration detection unit 110 ⁇ / b> A and the second vibration detection unit 110 ⁇ / b> B are configured to transmit vibration propagating through the pipe 900 or the fluid 910 (liquid or gas) in the pipe 900 via the pipe 900. It is installed so that it can be detected.
  • the first vibration detection unit 110 ⁇ / b> A and the second vibration detection unit 110 ⁇ / b> B may be attached to the inner wall surface of the pipe 900.
  • the first vibration detection unit 110A and the second vibration detection unit 110B are installed on the outer surface or inside of a flange (not shown) installed in the pipe 900 or an accessory (not shown) such as a valve plug. May be.
  • the pipe 900 is embedded in the underground 600 as shown in FIG.
  • the pipe 900 may be installed in an attic or a basement of a building, and may be embedded in a wall, a pillar, or the like of the building.
  • FIG. 1 shows a leak hole 920.
  • the leak hole 920 is a hole formed in the pipe 900 due to aging or external damage.
  • the fluid 910 flowing through the pipe 900 leaks from the leak hole 920.
  • FIG. 2 is a functional block diagram of the first vibration detection unit 110A and the second vibration detection unit 110B. As shown in FIG. 2, each of the first vibration detection unit 110 ⁇ / b> A and the second vibration detection unit 110 ⁇ / b> B includes a vibration detection sensor 111 and a vibration detection side transmission unit 112.
  • the vibration detection sensor 111 is connected to the vibration detection side transmission unit 112.
  • the vibration detection sensor 111 may be permanently installed at the installation location to detect vibration constantly, or may be installed for a predetermined period to detect vibration intermittently.
  • a sensor that measures solid vibration can be used.
  • the vibration detection sensor 111 can be a piezoelectric acceleration sensor, an electrodynamic acceleration sensor, a capacitance acceleration sensor, an optical speed sensor, a dynamic strain sensor, or the like.
  • the vibration detection sensor 111 detects “vibration generated due to the state of the pipe 900 or the fluid 910 flowing in the pipe 900 and propagating the fluid 910 flowing in the pipe 900”. Further, the vibration detection sensor 111 also detects vibrations that are changing. The vibration being changed is vibration that propagates through the pipe 900 or the fluid 910 flowing through the pipe 900 while being changed by a vibration changing unit 120 described later.
  • the vibration detection side transmission unit 112 is connected to the vibration detection sensor 111.
  • the vibration detection side transmission unit 112 is also connected to the processing device 130.
  • the vibration detection side transmission unit 112 transmits the vibration data detected by the vibration detection sensor 111 to the processing unit 130.
  • the vibration changing unit 120 changes to a characteristic (referred to as a flow vibration characteristic) related to vibration (referred to as flow vibration) caused by the fluid flowing in the pipe 900 through the pipe 900 or the fluid 910 flowing in the pipe 900.
  • a flow vibration characteristic referred to as flow vibration
  • the vibration changing unit 120 is attached to the outer wall surface of the pipe 900.
  • the vibration changing unit 120 may be attached to the inner wall surface of the pipe 900.
  • the vibration changing unit 120 may be installed on the outer surface or inside of a flange (not shown) installed in the pipe 900 or an accessory (not shown) such as a valve plug.
  • the vibration changing unit 120 changes vibration characteristics (flow vibration characteristics) relating to flow vibration, which is vibration generated by the flow of the fluid 910 flowing in the pipe 900, thereby causing vibration propagating in the pipe 900 or the fluid 910 flowing in the pipe 900. Change.
  • the vibration change unit 120 is preferably provided on the upstream side of the attachment position of the pipe 900 of the first and second vibration detection units 110A and 110B. Thereby, the characteristic (flow vibration characteristic) regarding the flow vibration which is the vibration generated by the flow of the fluid 910 flowing in the pipe 900 can be changed more efficiently.
  • the vibration changing unit 120 may operate independently with respect to the first and second vibration detecting units 110A and 110B (a pair of vibration detecting units) and the leakage position specifying calculating unit 134. Accordingly, the vibration changing unit 120 can operate without being affected by the first and second vibration detecting units 110A and 110B and the leakage position specifying calculating unit 134.
  • the vibration changing unit 120 does not necessarily follow the control signal.
  • the vibration changing unit 120 is expected to have the same effect even if the fluid leakage position is specified using vibration data in a time zone where the fluid is used frequently, for example.
  • the vibration data in the time zone in which the fluid is frequently used is vibration data in the time zone in which the pressure fluctuation in the pipe frequently occurs and the fluid leakage vibration changes accordingly.
  • a water distribution facility that controls the water network can be used as the vibration changing unit 120.
  • a device such as a pressure pump or a pressure reducing valve can be used.
  • FIG. 3 is a functional block diagram of the vibration changing unit 120. As shown in FIG. 3, the vibration changing unit 120 includes a vibration changing unit 121 and a control signal receiving unit 122.
  • the vibration changing means 121 is connected to the control signal receiving unit 122.
  • the vibration changing unit 121 changes the vibration propagating through the pipe 900 or the fluid 910 flowing in the pipe 900 by changing the flow vibration characteristics based on the control signal received by the control signal receiving unit 122.
  • the vibration changing means 121 changes the flow vibration characteristics to vibration having a large autocorrelation as compared with the stationary case based on the control signal. If the autocorrelation of the fluid flow vibration (fluid leakage vibration) in the leak hole 920 is large, the cross-correlation in the true arrival time difference of the vibration detected by the two vibration detectors 110A and 110B separated from the leak hole 920 also increases.
  • the amplitude of the fluid flow vibration may be changed by the vibration changing means 121, the frequency may be changed, or a combination of both may be used.
  • the control signal is output by the control unit 131 described later.
  • the control signal is a vibration change instruction signal for changing vibration propagating in the pipe 900 or the fluid 910 flowing in the pipe 900 by changing characteristics relating to flow vibration, which is vibration generated by the flow of the fluid 910 flowing in the pipe 900. is there. This control signal is generated by the control unit 131 described later.
  • control signal receiving unit 122 is connected to the vibration changing means 121.
  • the control signal receiving unit 122 is also connected to the processing unit 130.
  • the control signal receiving unit 122 receives a control signal transmitted by the control unit 131 described later and outputs it to the vibration changing unit 121.
  • vibration changing unit 120 (vibration changing means 121) will be described in more detail later.
  • the processing unit 130 is connected to the first vibration detection unit 110 ⁇ / b> A, the second vibration detection unit 110 ⁇ / b> B, and the vibration change unit 120.
  • the processing unit 130 receives data of vibrations detected by the first and second vibration detection units 110A and 110B.
  • FIG. 4 is a diagram showing functional blocks of the processing unit 130.
  • the processing unit 130 includes a control unit 131, a processing unit side transmission unit 132, a control signal storage unit 133, a leakage position specifying calculation unit 134, a leakage determination unit 135, and a processing unit side.
  • a receiving unit 136 is a diagram showing functional blocks of the processing unit 130.
  • the processing unit 130 includes a control unit 131, a processing unit side transmission unit 132, a control signal storage unit 133, a leakage position specifying calculation unit 134, a leakage determination unit 135, and a processing unit side.
  • control unit 131 is connected to the processing unit side transmission unit 132, the control signal storage unit 133, the leakage position specifying calculation unit 134, the leakage determination unit 135, and the processing unit side reception unit 136.
  • the control unit 131 corresponds to the control device of the present invention.
  • the control unit 131 generates a control signal to be transmitted to the processing unit side transmission unit 132 and outputs the control signal to the processing unit side transmission unit 132.
  • the control signal changes the vibration propagating through the pipe 900 or the fluid 910 flowing in the pipe 900 by changing the characteristics relating to the flow vibration, which is the vibration generated by the flow of the fluid 910 flowing in the pipe 900.
  • This is a vibration change instruction signal.
  • control unit 131 receives an input of a vibration detection signal when detecting vibration in change by a processing unit side receiving unit 136 described later.
  • the vibration under change is vibration that propagates through the pipe 900 or the fluid 910 flowing in the pipe 900 while being changed based on the vibration change instruction signal (control signal).
  • the control unit 131 outputs a fluid leakage position calculation instruction signal to the leakage position specifying calculation unit 134 based on the changing vibration included in the vibration detection signal.
  • the fluid leakage position calculation instruction signal is a signal for calculating a fluid leakage position (position of the leakage hole 920) that is a position where the fluid 910 is leaking from the pipe 900.
  • the processing unit side transmission unit 132 is connected to the control unit 131.
  • the processing unit side transmission unit 132 is connected to the vibration changing unit 120.
  • the processing unit side transmission unit 132 transmits a control signal (vibration change instruction signal) generated by the control unit 131 to the vibration change unit 120.
  • the control signal storage unit 133 is connected to the control unit 131.
  • a plurality of control signals ((vibration change instruction signals) are stored in the control signal storage unit 133. That is, the control signal storage unit 133 is referred to by the vibration change unit 120 to change the fluid leakage vibration characteristics. For example, a signal that changes the amplitude of fluid flow vibration (fluid leakage vibration), a signal that changes frequency, or a combination of both is changed with respect to the vibration changing unit 120 (vibration changing means 121).
  • the signal to be stored is stored in the control signal storage unit 133.
  • the leakage position specifying calculation unit 134 is connected to the control unit 131 and the processing unit side receiving unit 136.
  • the leakage position specifying calculation unit 134 calculates the fluid leakage position (the position of the leakage hole 920) based on the changing vibration detected by the first and second vibration detection units 110A and 110B.
  • the fluid leakage position is a position where the fluid 910 is leaking from the pipe 900.
  • the leakage position specifying calculation unit 134 receives, from the processing unit side receiving unit 136, data on the vibrations being detected detected by the first and second vibration detecting units 110A and 110B. Then, the leakage position specifying calculation unit 134 analyzes the vibration data being changed.
  • the characteristic component of the specific frequency resulting from the leak hole 920 (defect) is referred to as a “first characteristic component”.
  • the leak position specifying calculation unit 134 includes the first feature component appearing in the vibration data acquired by the first vibration detection unit 110A and the first feature component appearing in the vibration data acquired by the second vibration detection unit 110B.
  • the fluid leak position (position of the leak hole 920) formed in the pipe 900 is specified using the correlation (eg, phase difference, time difference) with the one feature component and the vibration propagation speed.
  • the leakage determination unit 135 is connected to the control unit 131 and the processing unit side receiving unit 136.
  • the leakage determination unit 135 determines whether there is a leakage in the pipe 900. That is, the leakage determination unit 135 determines whether or not the leakage hole 920 is formed in the pipe 900 based on at least one of the vibration data detected by the first and second vibration detection units 110A and 110B.
  • the specific vibration frequency component shows a larger amplitude than when the leak hole 920 is not formed.
  • a case where the leak hole 920 is not formed in the pipe 900 is regarded as a normal state. That is, when the leak hole 920 is formed in the pipe 900, the vibration frequency component in a specific range is normal (normal) in the vibration data detected by the first and second vibration detectors 110A and 110B. A characteristic showing a large amplitude appears.
  • the leakage determination unit 135 analyzes the vibration data detected by the first and second vibration detection units 110A and 110B, and determines whether or not the above-described feature appears. More specifically, the fluid leakage determination unit 135 determines whether or not the leakage hole 920 is formed in the pipe 900 by determining whether or not the amplitude threshold value at the normal time is exceeded.
  • the leakage determination unit 135 is not an indispensable component of the present invention. Therefore, the leakage determination unit 135 can be omitted.
  • the processing unit side receiving unit 136 is connected to the control unit 131, the leakage position specifying calculation unit 134, and the leakage determination unit 135.
  • the processing unit side reception unit 136 is also connected to the first vibration detection unit 110A and the second vibration detection unit 110B.
  • the processing unit side receiving unit 136 receives the vibration data detected by the first and second vibration detection units 110A and 110B from the first and second vibration detection units 110A and 110B.
  • FIG. 5 is a diagram showing an operation flow of the defect analysis apparatus 100 according to the first embodiment of the present invention.
  • the first and second vibration detection units 110A and 110B measure the first and second vibration data (step (STEP: hereinafter referred to as S) 1). More specifically, the vibration that each vibration detection sensor 111 in the first and second vibration detection units 110A and 110B propagates in the pipe 900 or the fluid 910 flowing in the pipe 900 is represented by the first and second vibration data. Detect as. Then, the vibration detection side transmission unit 112 receives the first and second vibration data from the vibration detection sensors 111 of the first and second vibration detection units 110 ⁇ / b> A and 110 ⁇ / b> B and transmits them to the processing unit 130. Next, the processing unit side receiving unit 136 of the processing unit 130 receives the first and second vibration data.
  • the leakage determination unit 135 performs a defect presence / absence determination process (S2). Specifically, the leak determination unit 135 determines whether there is a leak in the pipe 900. That is, as described above, the leak determination unit 135 determines whether or not the leak hole 920 is formed in the pipe 900 based on at least one of the first and second vibration data (whether or not the pipe 900 is defective). ). Leakage determination unit 135 may determine whether or not leakage hole 920 is formed in pipe 900 based on both the first and second vibration data.
  • the process of S1 is repeated again.
  • the processing of S2 and S3 may not be included in the configuration requirements of the present invention. In this case, the processes of S2 and S3 can be omitted. That is, after the process of S1 is completed, the process of S4 is performed.
  • the vibration changing unit 120 changes the vibration (S4).
  • the vibration changing unit 120 changes the vibration propagating through the pipe 900 or the fluid 910 flowing in the pipe 900 by changing the characteristics (flow vibration characteristics) related to the flow vibration.
  • the characteristic regarding the flow vibration is vibration generated by the flow of the fluid 910 flowing in the pipe 900 as described above.
  • control unit 131 generates a control signal to be output to the processing unit side transmission unit 132, and inputs this to the processing unit side transmission unit 132.
  • the control unit 131 may extract the vibration change instruction signal from the control signal storage unit 133 and output it to the processing unit side transmission unit 132 as a control signal.
  • the control signal changes the vibration propagating through the pipe 900 or the fluid 910 flowing in the pipe 900 by changing the characteristics related to the flow vibration, which is the vibration generated by the flow of the fluid 910 flowing in the pipe 900 as described above. This is a vibration change instruction signal.
  • the processing unit side transmission unit 132 transmits a control signal to the vibration changing unit 120.
  • the control signal receiving unit 122 receives the control signal from the processing unit side transmitting unit 132 and outputs it to the vibration changing unit 121.
  • the vibration changing unit 121 changes the vibration propagating through the pipe 900 or the fluid 910 flowing in the pipe 900 by changing the flow vibration characteristics based on the control signal.
  • vibration changing unit 120 vibration changing means 121
  • the vibration changing unit 120 changes the characteristics (flow vibration characteristics) related to the flow vibration, which is vibration generated by the flow of the fluid 910 flowing in the pipe 900, thereby changing the pipe 900 or the fluid 910 flowing in the pipe 900. Change propagating vibration. Examples of the flow vibration characteristics include amplitude and frequency.
  • Examples of means for changing the amplitude and frequency of the fluid vibration include applying pressure to the fluid 910 and applying a temperature change.
  • the vibration changing unit 120 changes the temperature of the fluid 910 flowing in the pipe 900 or a pressure control unit (not shown, for example, a pressure pump or a pressure reducing valve) that changes the pressure of the fluid 910 flowing in the pipe 900.
  • a temperature control unit (not shown, for example, a heater) is included as the vibration changing unit 121.
  • FIG. 6 is a diagram showing an example of the relationship between the frequency and amplitude acceleration of fluid vibration when different pressures are applied to the fluid 910.
  • the amplitude and frequency of the fluid wave change. Specifically, when the pressure applied to the fluid 910 is changed from P1 to P2, the amplitude acceleration decreases and the frequency increases. Note that when changing the pressure applied to the fluid 910, the pressure may be increased or decreased.
  • FIG. 7 is a diagram showing an example of the relationship between the frequency and amplitude acceleration of the fluid vibration when different temperature changes are given to the fluid 910.
  • the amplitude and frequency of the fluid wave change. Specifically, when the temperature of the fluid 910 is changed from T1 to T2, the amplitude acceleration decreases and the frequency increases.
  • the temperature may be increased or decreased.
  • the vibration changing unit 120 changes the amplitude or frequency of the flow vibration as the characteristic (flow vibration characteristic) related to the flow vibration, which is the vibration generated by the flow of the fluid 910 flowing in the pipe 900, thereby the pipe 900 or the pipe 900.
  • the vibration propagating through the fluid 910 flowing inside can be changed.
  • the first and second vibration detection units 110A and 110B measure the first and second unsteady vibration data (S5).
  • the first unsteady vibration data is data detected by the first vibration detection unit 110 ⁇ / b> A and propagates through the pipe 900 and the fluid 910 flowing through the pipe 900 after being changed by the vibration change unit 120.
  • the second unsteady vibration data is data detected by the second vibration detection unit 110B and propagates through the pipe 900 and the fluid 910 flowing through the pipe 900 after being changed by the vibration change unit 120.
  • the steady state refers to a state in which no change is applied by the vibration change unit 120
  • the non-steady state refers to a state in which a change is applied by the vibration change unit 120.
  • the vibration detection sensors 111 of the first and second vibration detection units 110A and 110B measure the first and second unsteady vibration data, and output them to the vibration detection side transmission unit 112.
  • the vibration detection side transmission unit 112 transmits the first and second unsteady vibration data to the processing unit 130.
  • the processing unit side receiving unit 136 receives the first and second unsteady vibration data.
  • the leakage position specification calculating unit 134 calculates the arrival time difference ⁇ T by correlation calculation (S6).
  • the arrival time difference ⁇ T is a difference value between the arrival time TA until the first vibration detection unit 110A detects vibration and the arrival time TB until the second vibration detection unit 110B detects vibration.
  • a method for calculating the arrival time difference ⁇ T by the leakage position specifying calculation unit 134 will be specifically described.
  • the operation of the leakage position specifying calculation unit 134 will be described while comparing the case where the flow vibration of the fluid 910 flowing in the pipe 900 is steady and the case where it is unsteady.
  • FIG. 8 shows an example of the flow vibration of the fluid 910 when the flow vibration of the fluid 910 flowing through the pipe 900 is steady.
  • FIG. 9 is an example of a cross-correlation function when the flow vibration of the fluid 910 flowing in the pipe 900 is steady.
  • the leakage vibration of the fluid 910 is a sine wave having an amplitude of 1 and a frequency of 125 Hz.
  • the distance between the first vibration detection unit 110A (vibration detection sensor 111) and the second vibration detection unit 110B (vibration detection sensor 111) is 100 m.
  • the noise of the first vibration detection unit 110A (vibration detection sensor 111) and the second vibration detection unit 110B (vibration detection sensor 111) is represented by a normal random number of variance 1.
  • the distance from the vibration detection unit 110A (vibration detection sensor 111) at the fluid leakage position was set to 30 m, the sound speed was set to 1300 m / s, that is, the arrival time difference of the fluid leakage vibration was set to 30.8 ms.
  • the maximum value does not appear at the arrival time difference of 30.8 ms that should originally appear, and the value of the maximum value is likely to change due to noise because the value of the peak having the maximum value is close to the value of the adjacent peak.
  • the arrival time difference ⁇ T between the arrival time TA until the first vibration detection unit 110A detects the vibration and the arrival time TB until the second vibration detection unit 110B detects the vibration is accurately detected. I could't. That is, the leakage position specifying calculation unit 134 can accurately calculate the arrival time difference ⁇ T based on the vibration data acquired by the first and second vibration detection units 110A and 110B in a state where the vibration change unit 120 does not operate. Can not.
  • FIG. 10 shows an example of the flow vibration of the fluid 910 when the flow vibration of the fluid 910 flowing in the pipe 900 is unsteady (frequency fluctuates).
  • FIG. 11 is an example of a cross-correlation function when the flow vibration of the fluid 910 flowing in the pipe 900 is non-stationary (frequency varies).
  • the leakage vibration of the fluid 910 changed by the vibration changing unit 120 is a chirp wave whose amplitude is 1 and whose frequency is changed from 50 Hz to 200 Hz.
  • the distance between the first vibration detection unit 110A (vibration detection sensor 111) and the second vibration detection unit 110B (vibration detection sensor 111) is 100 m.
  • the noise of the first vibration detection unit 110A (vibration detection sensor 111) and the second vibration detection unit 110B (vibration detection sensor 111) is represented by a normal random number of variance 1.
  • the distance from the vibration detection unit 110A (vibration detection sensor 111) at the fluid leakage position is set to 100 m
  • the sound speed is set to 1300 m / s
  • the arrival time difference of the fluid leakage vibration is set to 30.8 ms.
  • the maximum value P1 clearly appears at an arrival time difference of 30.8 ms at which the maximum value should appear.
  • the point that the maximum value P1 is clearly displayed is clear when compared with FIG. That is, in FIG. 11, compared to the steady-state cross-correlation function shown in FIG. 9, there is a large level difference between the value of the peak having the maximum value P1 and the adjacent peak, so that it is less susceptible to noise.
  • the arrival time difference ⁇ T between the arrival time TA until the first vibration detection unit 110A detects vibration and the arrival time TB until the second vibration detection unit 110B detects vibration is shown in FIG. As shown, it can be detected accurately. That is, when the vibration data (first and second unsteady vibration data) acquired by the first and second vibration detection units 110A and 110B is used in a state where the vibration changing unit 120 is operated, the leak position specifying calculation is performed. The unit 134 can accurately calculate the arrival time difference ⁇ T.
  • the vibration changing unit 120 changes the vibration propagating in the pipe 900 or the fluid 910 flowing in the pipe 900 by changing the characteristic (flow vibration characteristic) related to the flow vibration will be described.
  • FIG. 12 shows an example of the flow vibration of the fluid 910 when the flow vibration of the fluid 910 flowing in the pipe 900 is unsteady (amplitude varies).
  • FIG. 13 is an example of a cross-correlation function when the flow vibration of the fluid 910 flowing in the pipe 900 is non-stationary (amplitude varies).
  • the leakage vibration of the fluid 910 changed by the vibration changing unit 120 is a wave whose amplitude changes while the frequency remains 125 Hz.
  • the distance between the first vibration detection unit 110A (vibration detection sensor 111) and the second vibration detection unit 110B (vibration detection sensor 111) is 100 m.
  • the noise of the first vibration detection unit 110A (vibration detection sensor 111) and the second vibration detection unit 110B (vibration detection sensor 111) is represented by a normal random number of variance 1.
  • the distance from the vibration detection unit 110A (vibration detection sensor 111) at the fluid leakage position was set to 30 m
  • the sound velocity was set to 1300 m / s
  • the arrival time difference of the fluid leakage vibration was set to 30.8 ms.
  • the maximum value P2 clearly appears at an arrival time difference of 30.8 ms where the maximum value should appear.
  • the point that the maximum value P2 is clearly displayed is clear when compared with FIG. That is, in FIG. 13, compared to the steady-state cross-correlation function shown in FIG. 9, the value of the peak having the maximum value P ⁇ b> 2 and the value of the adjacent peak have a large level difference.
  • the arrival time difference ⁇ T between the arrival time TA until the first vibration detection unit 110A detects vibration and the arrival time TB until the second vibration detection unit 110B detects vibration is shown in FIG. As shown, it can be detected accurately. That is, when the vibration data (first and second unsteady vibration data) acquired by the first and second vibration detection units 110A and 110B is used in a state where the vibration changing unit 120 is operated, the leak position specifying calculation is performed. The unit 134 can accurately calculate the arrival time difference ⁇ T.
  • the vibration changing unit 120 changes the vibration propagating through the pipe 900 or the fluid 910 flowing in the pipe 900 by changing the characteristics (flow vibration characteristics) related to the flow vibration, explain.
  • FIG. 14 shows an example of the flow vibration of the fluid 910 when the flow vibration of the fluid 910 flowing in the pipe 900 is unsteady (frequency and amplitude fluctuate).
  • FIG. 15 is an example of a cross-correlation function when the flow vibration of the fluid 910 flowing in the pipe 900 is nonstationary (frequency and amplitude fluctuate).
  • the leakage vibration of the fluid 910 changed by the vibration changing unit 120 is a chirp wave whose amplitude varies and the frequency also changes from 50 Hz to 200 Hz.
  • the distance between the first vibration detection unit 110A (vibration detection sensor 111) and the second vibration detection unit 110B (vibration detection sensor 111) is 100 m.
  • the noise of the first vibration detection unit 110A (vibration detection sensor 111) and the second vibration detection unit 110B (vibration detection sensor 111) is represented by a normal random number of variance 1.
  • the distance from the vibration detection unit 110A (vibration detection sensor 111) at the fluid leakage position was set to 30 m
  • the sound velocity was set to 1300 m / s
  • the arrival time difference of the fluid leakage vibration was set to 30.8 ms.
  • the maximum value P3 clearly appears at an arrival time difference of 30.8 ms where the maximum value should appear.
  • the point that the maximum value P3 is clearly displayed is clear when compared with FIG. That is, in FIG. 15, compared to the steady-state cross-correlation function shown in FIG. 9, the value of the peak having the maximum value P ⁇ b> 3 and the value of the adjacent peak have a large level difference, and thus are less susceptible to noise.
  • the arrival time difference ⁇ T between the arrival time TA until the first vibration detection unit 110A detects vibration and the arrival time TB until the second vibration detection unit 110B detects vibration is shown in FIG. As shown, it can be detected accurately. That is, when the vibration data (first and second unsteady vibration data) acquired by the first and second vibration detection units 110A and 110B is used in a state where the vibration changing unit 120 is operated, the leak position specifying calculation is performed. The unit 134 can accurately calculate the arrival time difference ⁇ T.
  • the leakage position specifying calculation unit 134 specifies the defect position (S7).
  • the leakage position specifying calculation unit 134 causes the fluid 910 to flow from the pipe 900 based on the vibration (first and second unsteady vibration data) detected by the first and second vibration detection units.
  • the fluid leakage position (defect position) which is the leaking position, is calculated.
  • the fluid leakage position (defect position) is calculated from the arrival time difference ⁇ T calculated in the process of S6 and the preset sound speed.
  • defect analysis apparatus 100 The operation of the defect analysis apparatus 100 according to the first embodiment of the present invention has been described above.
  • the defect analysis apparatus 100 includes the vibration changing unit 120 (vibration changing unit) and the first and second vibration detecting units 110A and 110B (a pair of vibration detecting units). , A pair of vibration detection units) and a leakage position specifying calculation unit (leakage position specifying calculation means) 134.
  • the vibration changing unit 120 changes the vibration propagating in the pipe 900 or the fluid 910 flowing in the pipe 900 by changing the characteristics related to the flow vibration that is the vibration generated by the flow of the fluid 910 flowing in the pipe 900.
  • the first and second vibration detection units 110 ⁇ / b> A and 110 ⁇ / b> B detect vibrations that are changing, which are vibrations that propagate through the pipe 900 or the fluid 910 that flows in the pipe 900 while being changed by the vibration change unit 120.
  • the leakage position specifying calculation unit 134 calculates a fluid leakage position, which is a position where the fluid 910 is leaking from the pipe 900, based on the changing vibration detected by the first and second vibration detection units 110A and 110B. To do.
  • the vibration changing unit 120 changes the characteristics (for example, frequency, amplitude, frequency, and amplitude) related to the flow vibration, which is vibration generated by the flow of the fluid 910 flowing in the pipe 900, thereby the pipe 900 or the pipe 900.
  • the vibration propagating through the fluid 910 flowing inside is changed.
  • the vibration that is changing which is the vibration that propagates through the pipe 900 or the fluid 910 that flows in the pipe 900, is changed to a signal with a clear autocorrelation function such as a chirp wave.
  • the first and second vibration detection units 110A and 110B detect the vibration that is changing as a signal with a clear maximum value of the autocorrelation function.
  • the vibration under change is vibration that propagates through the pipe 900 or the fluid 910 that flows in the pipe 900 while being changed by the vibration changing unit 120.
  • the fluid flow The maximum value of the cross-correlation function when is non-stationary is clear.
  • the leak position specifying calculation unit 134 detects it accurately. Then, the fluid leakage position (leakage hole 920) can be calculated more accurately by using the arrival time difference ⁇ T and a preset sound velocity.
  • a cross-correlation function with a clear maximum value can be used, and leakage vibration to the first and second vibration detection units 110A and 110B. Can be accurately determined.
  • the fluid leakage position (leakage hole 920) can be specified with high accuracy.
  • the vibration changing unit 120 changes the flow frequency as a characteristic relating to the flow vibration, so that the inside of the pipe 900 or the pipe 910 is changed.
  • the vibration propagating through the fluid 910 flowing through the fluid is changed.
  • the vibration propagating through the fluid 910 flowing in the pipe 900 or the pipe 910 can be easily changed by changing the flow frequency.
  • the vibration changing unit 120 flows in the pipe 900 or the pipe 910 by changing the amplitude of the flow as a characteristic relating to the flow vibration.
  • the vibration propagating through the fluid 910 is changed.
  • the vibration propagating through the fluid 910 flowing in the pipe 900 or the pipe 910 can be easily changed by changing the amplitude of the flow.
  • the vibration changing unit 120 changes the frequency and amplitude of the flow as characteristics relating to the flow vibration, so that the inside of the pipe 900 or the pipe 910 The vibration propagating through the fluid 910 flowing through the fluid is changed.
  • the vibration propagating in the fluid 910 flowing in the pipe 900 or the pipe 910 can be easily changed by changing the amplitude and frequency of the flow as the characteristics related to the flow vibration.
  • the leakage position specification calculation unit 134 (leakage position specification calculation unit) includes first and second vibration detection units 110A and 110B (a pair of vibration detection units, The measurement value of the vibration in change detected by the pair of vibration detection units) is subjected to correlation processing. Thereby, the leakage position specifying calculation unit 134 calculates a time difference in which the vibration under change propagates between each of the first and second vibration detection units 110A and 110B and the leakage position (leakage hole 920). The leak position is calculated using the calculated time difference. Thus, by correlating the measured vibration values detected by the first and second vibration detection units 110A and 110B (a pair of vibration detection units), the fluid flow is unsteady.
  • the maximum value of the cross correlation function becomes clear. Thereby, the arrival time difference ⁇ T between the arrival time TA until the first vibration detection unit 110A detects the vibration and the arrival time TB until the second vibration detection unit 110B detects the vibration is described later.
  • the leak position specifying calculation unit 134 detects it accurately.
  • the vibration changing unit 120 is a pressure control unit (pressure control unit) that changes the pressure of the fluid 910 flowing in the pipe 900, or a pipe.
  • a temperature control unit temperature control means that changes the temperature of the fluid 910 flowing through the inside 900 is provided.
  • the vibration changing unit 120 (vibration changing unit) includes first and second vibration detecting units 110A and 110B (a pair of vibration detecting units and a pair of vibration detecting units). Part) is provided on the upstream side of the attachment position to the pipe 900. Thereby, the characteristic (flow vibration characteristic) regarding the flow vibration which is the vibration generated by the flow of the fluid 910 flowing in the pipe 900 can be changed more efficiently.
  • the vibration changing unit 120 (vibration changing unit) includes first and second vibration detecting units 110A and 110B (a pair of vibration detecting units and a pair of vibration detecting units). Section) and the leakage position specifying calculation section 134 may be operated independently. Accordingly, the vibration changing unit 120 can operate without being affected by the first and second vibration detecting units 110A and 110B and the leakage position specifying calculating unit 134.
  • the vibration changing unit 120 (vibration changing means) operates within a time when the flow rate of the fluid 910 flowing through the pipe 900 is equal to or less than a predetermined threshold.
  • the usage-amount of the fluid 910 can be reduced. That is, when the fluid 910 is water and the pipe 900 is a water pipe, if the analysis by the defect analysis apparatus 100 is performed at a predetermined time when the frequency of the original fluid operation is low, the influence on the original fluid operation is reduced. can do. That is, for example, when the amount of water used is small, such as at midnight, even if the analysis by the defect analyzer 100 is performed, the water is transported to the faucet of the water user equipment (original (Fluid operation) can be reduced.
  • control unit 131 (control device) changes the characteristic relating to the flow vibration, which is the vibration generated by the flow of the fluid 910 flowing through the pipe 900, thereby generating a vibration change instruction signal.
  • the vibration change instruction signal is a signal that changes the vibration propagating through the fluid flowing in the pipe 900 or the pipe 910.
  • control unit 131 detects vibrations that are changing, which are vibrations that propagate through the pipe 900 or the fluid 910 that flows through the pipe 900 while being changed based on the vibration change instruction signal. Receives detection signal input.
  • control unit 131 calculates a fluid leakage position calculation instruction signal for calculating a fluid leakage position that is a position where the fluid 910 is leaking from the pipe 900 based on the vibration under change included in the vibration detection signal. Is output.
  • the signal processing for operating the main functions of the defect analysis apparatus 100 described above can be integrated into the control unit 131 (control apparatus).
  • the defect analysis method in the first embodiment of the present invention includes a vibration changing process, a vibration detecting process, and a leak position specifying process.
  • the vibration changing process the vibration propagating in the pipe 900 or the fluid 910 flowing in the pipe 900 is changed by changing the characteristics relating to the flow vibration that is the vibration generated by the flow of the fluid 910 flowing in the pipe 900.
  • vibration detection step vibration during change is detected.
  • the vibration being changed is vibration that propagates through the pipe 900 or the fluid 910 flowing in the pipe 900 while being changed by the vibration changing process.
  • a fluid leakage position which is a position where the fluid 910 is leaking from the pipe 900, is calculated based on the changing vibration detected by the vibration detection step.
  • the storage medium according to the first embodiment of the present invention stores a program that causes a computer to perform the steps indicated in the defect analysis method described above. This storage medium also has the same effect as the defect analysis apparatus 100 described above.
  • FIG. 16 is a diagram showing an operation flow of the defect analysis apparatus according to the second embodiment of the present invention.
  • FIG. 5 and FIG. 16 are compared.
  • the vibration changing process (S4) is performed after the first and second vibration data measurement processes (S1).
  • the process (S4) for changing the vibration is performed before the first and second vibration data measurement processes (S1). In this respect, they are different from each other.
  • the vibration changing unit 120 changes the vibration (S4). That is, the vibration changing unit 120 propagates the pipe 900 or the fluid 910 flowing in the pipe 900 by changing the characteristic (flow vibration characteristics) related to the flow vibration that is vibration generated by the flow of the fluid 910 flowing in the pipe 900. Change the vibration.
  • the first and second vibration detection units 110A and 110B measure the first and second vibration data (S1). More specifically, the vibration that each vibration detection sensor 111 in the first and second vibration detection units 110A and 110B propagates in the pipe 900 or the fluid 910 flowing in the pipe 900 is represented by the first and second vibration data. Detect as. Then, the vibration detection side transmission unit 112 receives the first and second vibration data from the vibration detection sensors 111 of the first and second vibration detection units 110 ⁇ / b> A and 110 ⁇ / b> B and transmits them to the processing unit 130. Next, the processing unit side receiving unit 136 of the processing unit 130 receives the first and second vibration data.
  • the leakage determination unit 135 performs a defect presence / absence determination process (S2). Specifically, the leak determination unit 135 determines whether there is a leak in the pipe 900. That is, as described above, the leak determination unit 135 determines whether or not the leak hole 920 is formed in the pipe 900 based on at least one of the first and second vibration data (whether or not the pipe 900 is defective). ). Leakage determination unit 135 may determine whether or not leakage hole 920 is formed in pipe 900 based on both the first and second vibration data.
  • the processes after S4 are repeated again.
  • the processing of S2 and S3 may not be included in the configuration requirements of the present invention. In this case, the processes of S2 and S3 can be omitted. That is, after the process of S1 is completed, the process of S4 is performed.
  • the leakage position specification calculation unit 134 calculates the arrival time difference ⁇ T by correlation calculation (S6).
  • the leakage position specification calculation unit 134 specifies the defect position (S7).
  • the leakage position specifying calculation unit 134 causes the fluid 910 to flow from the pipe 900 based on the vibration (first and second unsteady vibration data) detected by the first and second vibration detection units.
  • the fluid leakage position (defect position) which is the leaking position, is calculated. More specifically, the fluid leakage position (defect position) is calculated from the arrival time difference ⁇ T calculated in the process of S6 and the preset sound speed.
  • the operation of the defect analysis apparatus according to the second embodiment of the present invention has been described above.
  • the effects of the defect analysis method in the present embodiment are the same as those described in the first embodiment.
  • the time zone in which the pressure deviates from the pressure optimized for the original operation purpose can be reduced, and the vibration can be reduced. Unnecessary driving of the changing portion can be reduced.
  • the apparatus of each embodiment of the present invention is centered on an arbitrary computer CPU (Central Processing Unit), a memory, a program loaded in the memory, a storage unit such as a hard disk for storing the program, and a network connection interface. It is realized by any combination of hardware and software.
  • the program includes a program downloaded from a storage medium such as a CD (Compact Disc) or a server on the Internet, in addition to a program stored in the memory from the stage of shipping the device in advance. It will be understood by those skilled in the art that there are various modifications to the implementation method and apparatus.
  • each device is described as being realized by one device, but the means for realizing it is not limited to this. That is, it may be a physically separated configuration or a logically separated configuration.
  • Vibration changing means for changing vibrations propagating through the pipe or the fluid by changing characteristics relating to flow vibration, which is vibration generated by the flow of fluid flowing in the pipe;
  • a pair of vibration detecting means for detecting vibrations in change which are vibrations propagating through the pipe or the fluid flowing in the pipe while being changed by the vibration changing means;
  • a defect analysis apparatus comprising: a leakage position specifying calculation means for calculating a fluid leakage position, which is a position where the fluid is leaking from the pipe, based on the vibration under change detected by the pair of vibration detection means. .
  • the leakage position specifying calculation means includes: By correlating the measurement values of the vibration under change detected by the pair of vibration detection means, a time difference in which the vibration under change propagates between each of the pair of vibration detection means and the leakage position is obtained. 5.
  • the defect analysis apparatus calculates the leakage position using the calculated time difference.
  • Appendix 6 The defect analysis apparatus according to any one of appendices 1 to 5, wherein the vibration changing unit includes a pressure control unit that changes the pressure of the fluid, or a temperature control unit that changes the temperature of the fluid flowing in the pipe. .
  • Appendix 7 The defect analysis apparatus according to any one of appendices 1 to 6, wherein the vibration changing unit is provided upstream of a position where the pair of vibration detection units are attached to the pipe.
  • the defect analysis apparatus according to any one of appendices 1 to 7, wherein the vibration changing unit operates independently with respect to the vibration detection unit and the leakage position specifying calculation unit.
  • a defect analysis method including a leakage position specifying step of calculating a fluid leakage position, which is a position where the fluid is leaking from the pipe, based on the vibration under change detected by the vibration detection step.
  • Information that causes a computer to perform processing including a leakage position specifying step of calculating a fluid leakage position, which is a position where the fluid is leaking from the pipe, based on the vibration under change detected by the vibration detection step. Processing program.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Examining Or Testing Airtightness (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)

Abstract

Selon la présente invention, en modifiant les caractéristiques de vibrations d'écoulement causées par un fluide (910) s'écoulant dans un tuyau (900), une unité de modification de vibration (120) modifie les vibrations se propageant par l'intermédiaire du tuyau (900) ou du fluide (910) s'écoulant dans le tuyau (900). Tandis que lesdites caractéristiques sont modifiées par l'unité de modification de vibration (120), des première et deuxième unités de détection de vibration (110A, 110B) détectent les vibrations modifiées se propageant par l'intermédiaire du tuyau (900) ou du fluide (910) s'écoulant dans le tuyau (900). Sur la base des vibrations modifiées détectées par les première et deuxième unités de détection de vibration (110A, 110B), une unité de calcul d'identification d'emplacement de fuite (134) calcule un emplacement de fuite de fluide, c'est-à-dire un emplacement auquel le fluide (910) fuit du tuyau (900). Cela permet de détecter un emplacement de fuite de fluide dans un tuyau plus précisément.
PCT/JP2015/001584 2014-03-26 2015-03-20 Dispositif d'analyse de défaut, procédé d'analyse de défaut, et support de stockage Ceased WO2015146109A1 (fr)

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WO2019031371A1 (fr) * 2017-08-07 2019-02-14 日本電気株式会社 Dispositif d'analyse d'état, procédé d'analyse d'état et support d'enregistrement
CN116697277A (zh) * 2023-05-31 2023-09-05 中国石油化工股份有限公司 一种用水管网泄漏监测点位布局优化方法

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JPH10281921A (ja) * 1997-04-07 1998-10-23 Hitachi Ltd ガス配管の漏洩監視方法および装置
JP4306409B2 (ja) * 2003-10-31 2009-08-05 Ｊｆｅスチール株式会社 配管の漏洩位置検知方法および装置

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JPH10185744A (ja) * 1996-12-20 1998-07-14 Tokyo Gas Co Ltd 配管漏洩位置特定方法における外部ノイズ判定方法
JPH10281921A (ja) * 1997-04-07 1998-10-23 Hitachi Ltd ガス配管の漏洩監視方法および装置
JP4306409B2 (ja) * 2003-10-31 2009-08-05 Ｊｆｅスチール株式会社 配管の漏洩位置検知方法および装置

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Publication number Priority date Publication date Assignee Title
WO2019031371A1 (fr) * 2017-08-07 2019-02-14 日本電気株式会社 Dispositif d'analyse d'état, procédé d'analyse d'état et support d'enregistrement
JPWO2019031371A1 (ja) * 2017-08-07 2020-07-30 日本電気株式会社 状態分析装置、状態分析方法及びプログラム
US11560698B2 (en) 2017-08-07 2023-01-24 Nec Corporation State analysis device, state analysis method, and recording medium
CN116697277A (zh) * 2023-05-31 2023-09-05 中国石油化工股份有限公司 一种用水管网泄漏监测点位布局优化方法

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