CN110553154B - Urban underground pipe network leakage monitoring method and system - Google Patents

Urban underground pipe network leakage monitoring method and system Download PDF

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CN110553154B
CN110553154B CN201810548227.8A CN201810548227A CN110553154B CN 110553154 B CN110553154 B CN 110553154B CN 201810548227 A CN201810548227 A CN 201810548227A CN 110553154 B CN110553154 B CN 110553154B
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signals
pipeline
bandwidth
equivalent amplitude
intensity
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CN110553154A (en
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高艳
马一凡
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Institute of Acoustics CAS
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17D—PIPE-LINE SYSTEMS; PIPE-LINES
    • F17D5/00—Protection or supervision of installations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17D—PIPE-LINE SYSTEMS; PIPE-LINES
    • F17D5/00—Protection or supervision of installations
    • F17D5/02—Preventing, monitoring, or locating loss
    • F17D5/06—Preventing, monitoring, or locating loss using electric or acoustic means

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Abstract

The invention discloses a method and a system for monitoring leakage of an urban underground pipe network, wherein the method is realized by installing a sensor on a pipeline and comprises the following steps: the sensor collects t second signals every s seconds to form M groups of signals; calculating the equivalent amplitude of each group of signals, and converting the equivalent amplitude into decibel representation; calculating the actual measurement bandwidth of the M groups of signals according to the distribution of equivalent amplitude decibel values; in the M groups of signals, sampling the equivalent amplitude decibel value with the most number of samples as the actually measured intensity of the signal; setting reference intensity and reference bandwidth when the pipeline is not leaked, and comparing the actually measured intensity and bandwidth with the reference intensity and bandwidth; when the actual measurement intensity is larger than the reference intensity and the actual measurement bandwidth is smaller than the reference bandwidth, judging that the pipeline leaks; otherwise, judging that the pipeline is not leaked. The monitoring system has the advantages of simple structure, low cost, strong feasibility and real-time monitoring performance.

Description

Urban underground pipe network leakage monitoring method and system
Technical Field
The invention relates to a pipeline detection technology, in particular to a real-time monitoring device and a real-time monitoring method for leakage conditions of an urban underground pipe network, and particularly relates to a method and a system for monitoring leakage of the urban underground pipe network.
Background
Urban underground pipelines have the functions of conveying energy, resources and transmitting information and are important underground infrastructures. The urban underground pipe network in China generally has the problems of aging or deterioration of facilities, lack of information and data and the like, and frequent occurrence of pipeline leakage and accidents. Therefore, the pipeline detection technology plays a significant role in maintaining the safe operation of the pipe network and information management.
At present, the level of the domestic pipe network leakage monitoring technology and the degree of equipment intellectualization are low, the dependence on the experience of professionals is large, the probability of leakage alarm and false alarm is high, and the pipe network has long maintenance period, large excavation range and serious fund waste.
Disclosure of Invention
The invention aims to provide a device and a method for acquiring, processing and alarming monitoring data of a pipe network aiming at the defects of the existing pipeline detection technology, and the device and the method have the advantages of simple structure, low cost, strong implementability and real-time monitoring performance. The device can be placed for a long time, can be movably installed in water, gas and oil pipes, can intelligently judge the leakage situation of the pipeline, and can send out early warning signals to clients in time through a wireless communication circuit, so that the economic loss caused by the leakage of the pipeline can be reduced to the maximum extent.
In order to achieve the purpose, the invention provides a method for monitoring leakage of an urban underground pipe network, which is realized by installing a sensor on a pipeline, and comprises the following steps: the sensor collects t second signals every s seconds to form M groups of signals; calculating the equivalent amplitude of each group of signals, and converting the equivalent amplitude into decibel representation; calculating the actual measurement bandwidth of the M groups of signals according to the distribution of equivalent amplitude decibel values; in the M groups of signals, sampling the equivalent amplitude decibel value with the most number of samples as the actually measured intensity of the signal; setting reference intensity and reference frequency width when the pipeline is not leaked, comparing the measured intensity with the reference intensity, and comparing the measured frequency width with the reference frequency width; when the actual measurement intensity is larger than the reference intensity and the actual measurement bandwidth is smaller than the reference bandwidth, judging that the pipeline leaks; otherwise, judging that the pipeline is not leaked.
As an improvement of the above method, the method specifically comprises:
step 1) collecting t second signals every s seconds to form M groups of signal data, and calculating the equivalent amplitude V of the mth group of signalsm：
Figure GDA0002449899810000021
Wherein, M is 1,2,. and M; x is the number ofiThe signal amplitude of the ith point in the mth group of signals is 1,2, N is the number of data points of each group of signals;
step 2) equivalent amplitude V of each groupmConversion to decibel values represents:
Im＝20log(Vm/Vref) (2)
wherein, VrefIs a signal reference voltage;
step 3) finding out the maximum value I in decibel values of equivalent amplitudes of the M groups of signal datamaxAnd a minimum value IminCalculating the actual measurement bandwidth S of the signalspread：
Sspread＝Imax-Imin(3)
Step 4) sampling the equivalent amplitude decibel value with the most number of samples in the M groups of signals as the actually measured intensity I of the signals;
step 5) when the measured intensity and the measured bandwidth simultaneously meet the following two conditions:
I＞Iref(4)
Sspread＜Sref(5)
wherein, IrefReference strength, S, for a non-leaking piperefThe reference bandwidth is the reference bandwidth when the pipeline is not leaked; judging that the pipeline is leaked, and sending out early warning; otherwise, judging that the pipeline is not leaked.
The invention also provides a system for monitoring leakage of the urban underground pipe network, which comprises the following components:
the sensor is arranged on the pipeline and used for converting the vibration or pressure signal of the pipeline into a voltage signal;
the acquisition module is used for acquiring voltage time domain signals of the sensor, converting the voltage time domain signals into digital signals and amplifying the digital signals;
the equivalent amplitude calculation module is connected with the acquisition module and used for calculating the equivalent amplitude of each group of time domain signals and converting the equivalent amplitude into a decibel value to represent the equivalent amplitude;
a characteristic parameter extraction module connected with the equivalent amplitude calculation module and used for setting the equivalent amplitude decibel value with the maximum number of samples output by the module as the measured intensity I of the signal and according to the maximum value I in the equivalent amplitude decibel valuesmaxAnd a minimum value IminCalculating the actual measurement bandwidth S by the differencespread＝Imax-Imin；
The comparison module is connected with the characteristic parameter extraction module and is used for simultaneously comparing the measured intensity with the reference intensity and the measured bandwidth with the reference bandwidth, and judging that the pipeline leaks when the measured intensity is greater than the reference intensity and the measured bandwidth is less than the reference bandwidth; otherwise, judging that the pipeline is not leaked; and
and the sending module is connected with the comparison module and used for sending the result of the comparison module to the client.
As an improvement of the above system, the acquisition module comprises an analog/digital converter and an amplifier.
The invention has the advantages that:
1. the monitoring system has the advantages of simple structure, low cost, strong feasibility and real-time monitoring performance;
2. the device can be placed for a long time, can be movably arranged on water, gas and oil pipes, can intelligently judge the leakage condition of the pipeline and timely send out early warning signals to customers through a wireless communication circuit, and can furthest reduce the economic loss caused by the leakage of the pipeline.
Drawings
FIG. 1 is a flow chart of a pipeline leak monitoring method of the present invention;
FIG. 2 is a decibel value of the equivalent amplitude of a signal when leakage occurs;
FIG. 3 is a decibel value of the equivalent amplitude of a signal when no leakage occurs;
fig. 4 is a schematic diagram of a pipeline leakage monitoring system of the present invention.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
The technical scheme of the invention is as follows: a high-sensitivity sensor is arranged on a pipeline, t second signals are collected at intervals of s seconds, and M groups of signals are formed. The equivalent amplitude of each set of M1, 2., M signals is calculated and converted to a decibel representation. And calculating the actual measurement bandwidth of the M groups of signals according to the distribution of the equivalent amplitude decibel values. And in the M groups of signals, sampling the equivalent amplitude decibel value with the most number of samples as the actually measured intensity of the signal. And setting reference intensity and reference frequency width when the pipeline does not leak, comparing the measured intensity with the reference intensity, and comparing the measured frequency width with the reference frequency width. When the actual measurement intensity is larger than the reference intensity and the actual measurement bandwidth is smaller than the reference bandwidth, judging that the pipeline leaks; otherwise, judging that the pipeline is not leaked.
The method according to the invention is described in further detail with reference to the figures and examples, without limiting the scope of the invention.
FIG. 1 is a flow chart of a method for monitoring leakage in a pipeline according to the present invention; each step is explained and exemplified in detail below:
step 1: arranging a sensor for converting vibration into voltage on the pipeline and collecting pipeline signals;
specifically, in this embodiment, a section of urban underground pipeline with a length of 80m is selected, an acceleration sensor is respectively arranged at pipeline valves in two inspection wells, and a pipeline vibration signal is sensed through an acquisition module, wherein the acquisition module comprises an analog/digital converter and an amplifier, and an analog signal is converted into a digital signal and amplified.
Step 2: the 5 second signal is acquired every 55 seconds, forming 50 sets of signal data (i.e. 50 samples), and the calculation of equation (1) is performed for each set of data:
Figure GDA0002449899810000041
wherein, VmEquivalent amplitude for the mth group of signals, unit: v; x is the number ofiIs the signal amplitude of the ith point in the mth group of signals.
And step 3: the equivalent amplitudes of the 50 sets of signals are converted to decibel values according to equation (2):
Im＝20log(Vm/Vref) (2)
wherein VrefFor signal reference voltage, unit: v;
in this embodiment, the equivalent amplitude decibel values of the signals acquired by the two sensors are shown in fig. 2 and 3, the distribution range of the equivalent amplitude decibel values in fig. 2 is 133dB to 140dB, wherein the equivalent amplitude decibel value of 12 groups of data is 136 dB; the distribution range of equivalent amplitude decibel value in fig. 3 is 38dB to 59dB, wherein the equivalent amplitude decibel value of 8 groups of data is 43 dB.
And 4, step 4: calculating the actual measurement bandwidth according to the formula (3):
Sspread＝Imax-Imin(3)
wherein SspreadMeasured bandwidth, unit: dB; i ismaxMaximum value of equivalent amplitude in decibels, unit: dB; i isminIs an equivalent amplitudeMinimum in decibel values, unit: dB;
in this embodiment, the maximum value in fig. 2 is 140dB, the minimum value is 133dB, the measured intensity of the signal is 136dB, and the measured bandwidth is 7 dB; in fig. 3, the maximum value is 59dB, the minimum value is 38dB, the measured intensity of the signal is 43dB, and the measured bandwidth is 21 dB;
and 5: reference intensity IrefSet to 100dB, reference bandwidth SrefSet to 20 dB; comparing the measured intensity and bandwidth with the reference intensity and bandwidth according to the formula (4) and the formula (5):
I＞Iref(4)
Sspread＜Sref(5)
if (4) and (5) are simultaneously satisfied in fig. 2, judging that the pipeline is leaked; if (4) and (5) are not satisfied in fig. 3, it is judged that the pipe is not leaking.
Step 6: and sending the pipeline leakage judgment result to the client.
As shown in fig. 4, the present invention provides a system for monitoring leakage of a pipeline, which includes the following modules:
the sensor is arranged on the pipeline and used for converting the vibration into voltage;
the acquisition module is used for acquiring a time domain signal of the sensor, comprises an analog/digital converter and an amplifier, and converts an analog signal into a digital signal and amplifies the digital signal;
the equivalent amplitude calculation module is connected with the acquisition module and used for calculating the equivalent amplitude of each group of time domain signals and converting the equivalent amplitude into decibel values to represent the equivalent amplitude, wherein the calculation formula is as follows:
Figure GDA0002449899810000051
Im＝20log(Vm/Vref)
the characteristic parameter extraction module is connected with the equivalent amplitude calculation module, the equivalent amplitude decibel value with the maximum number of samples output by the module is taken as the measured intensity I of the signal, and the measured bandwidth is calculated according to the difference value between the maximum value and the minimum value in the equivalent amplitude decibel values:
Sspread＝Imax-Imin
the comparison module is connected with the characteristic parameter extraction module and used for comparing the actually measured intensity, the bandwidth and the reference intensity, the bandwidth and judging whether the pipeline leaks or not according to the following conditions:
I＞Iref
Sspread＜Sref
and the sending module is connected with the comparison module and used for sending the result of the comparison module, namely the information about whether leakage occurs to the client.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and are not limited. Although the present invention has been described in detail with reference to the embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (4)

1. A leakage monitoring method for an urban underground pipe network is realized by installing a sensor on a pipeline, and is characterized by comprising the following steps: the sensor collects t second signals every s seconds to form M groups of signals; calculating the equivalent amplitude of each group of signals, and converting the equivalent amplitude into decibel representation; calculating the actual measurement bandwidth of the M groups of signals according to the distribution of equivalent amplitude decibel values; in the M groups of signals, sampling the equivalent amplitude decibel value with the most number of samples as the actually measured intensity of the signal; setting reference intensity and reference frequency width when the pipeline is not leaked, comparing the measured intensity with the reference intensity, and comparing the measured frequency width with the reference frequency width; when the actual measurement intensity is larger than the reference intensity and the actual measurement bandwidth is smaller than the reference bandwidth, judging that the pipeline leaks; otherwise, judging that the pipeline is not leaked.
2. The urban underground pipe network leakage monitoring method according to claim 1, wherein the method specifically comprises:
step 1) collecting t second signals every s seconds to form M groups of signal data,calculating the equivalent amplitude V of the mth group of signalsm：
Figure FDA0002449899800000011
Wherein, M is 1,2,. and M; x is the number ofiThe signal amplitude of the ith point in the mth group of signals is 1,2, N is the number of data points of each group of signals;
step 2) equivalent amplitude V of each groupmConversion to decibel values represents:
Im＝20log(Vm/Vref) (2)
wherein, VrefIs a signal reference voltage;
step 3) finding out the maximum value I in decibel values of equivalent amplitudes of the M groups of signal datamaxAnd a minimum value IminCalculating the actual measurement bandwidth S of the signalspread：
Sspread＝Imax-Imin(3)
Step 4) sampling the equivalent amplitude decibel value with the most number of samples in the M groups of signals as the actually measured intensity I of the signals;
step 5) when the measured intensity and the measured bandwidth simultaneously meet the following two conditions:
I＞Iref(4)
Sspread＜Sref(5)
wherein, IrefReference strength, S, for a non-leaking piperefThe reference bandwidth is the reference bandwidth when the pipeline is not leaked; judging that the pipeline is leaked, and sending out early warning; otherwise, judging that the pipeline is not leaked.
3. The utility model provides an urban underground pipe network leakage monitoring system which characterized in that, the system includes:
the sensor is arranged on the pipeline and used for converting the vibration or pressure signal of the pipeline into a voltage signal;
the acquisition module is used for acquiring voltage time domain signals of the sensor, converting the voltage time domain signals into digital signals and amplifying the digital signals;
the equivalent amplitude calculation module is connected with the acquisition module and used for calculating the equivalent amplitude of each group of time domain signals and converting the equivalent amplitude into a decibel value to represent the equivalent amplitude;
a characteristic parameter extraction module connected with the equivalent amplitude calculation module and used for setting the equivalent amplitude decibel value with the maximum number of samples output by the module as the measured intensity I of the signal and according to the maximum value I in the equivalent amplitude decibel valuesmaxAnd a minimum value IminCalculating the actual measurement bandwidth S by the differencespread＝Imax-Imin；
The comparison module is connected with the characteristic parameter extraction module and is used for simultaneously comparing the measured intensity with the reference intensity and the measured bandwidth with the reference bandwidth, and judging that the pipeline leaks when the measured intensity is greater than the reference intensity and the measured bandwidth is less than the reference bandwidth; otherwise, judging that the pipeline is not leaked; and
and the sending module is connected with the comparison module and used for sending the result of the comparison module to the client.
4. The urban underground pipe network leakage monitoring system according to claim 3, wherein the acquisition module comprises an analog-to-digital converter and an amplifier.
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5675506A (en) * 1992-10-09 1997-10-07 Rensselaer Polytechnic Institute Detection of leaks in vessels
US5416724A (en) * 1992-10-09 1995-05-16 Rensselaer Polytechnic Institute Detection of leaks in pipelines
US7102504B2 (en) * 2004-05-27 2006-09-05 Lawrence Kates Wireless sensor monitoring unit
CN1994800A (en) * 2006-12-29 2007-07-11 北京交通大学 Method and system for realizing train positioning and real-time tracking by using leakage coaxial cable
US8166801B2 (en) * 2007-09-30 2012-05-01 Los Alamos National Security, Llc Non-invasive fluid density and viscosity measurement
CN202040552U (en) * 2010-08-12 2011-11-16 北京知容寓远软件科技有限公司 System for monitoring the leakage or obstruction of pipeline base on low frequency sound wave
CN105351756B (en) * 2015-11-23 2018-04-03 杨璐馨 A kind of pipe leakage identification and alignment system and method based on acoustic imaging
CN105757464A (en) * 2016-03-31 2016-07-13 陈思宇 Explosion-proof type intelligent fault detection system and detection method implemented by same

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