CN110939875A - Pipeline leakage detection and positioning method and system based on spectral line analysis - Google Patents
Pipeline leakage detection and positioning method and system based on spectral line analysis Download PDFInfo
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- CN110939875A CN110939875A CN201911297685.XA CN201911297685A CN110939875A CN 110939875 A CN110939875 A CN 110939875A CN 201911297685 A CN201911297685 A CN 201911297685A CN 110939875 A CN110939875 A CN 110939875A
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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
- F17D5/02—Preventing, monitoring, or locating loss
- F17D5/06—Preventing, monitoring, or locating loss using electric or acoustic means
Abstract
The invention relates to a pipeline leakage detection and positioning method and a system thereof based on spectral line analysis, wherein the method comprises the following steps: arranging two detection devices for collecting pipeline signals on a pipeline at a certain distance; acquiring a time sequence signal of a pipeline detected by a detection device, converting the time sequence signal into a frequency spectrum sequence signal, and matching the frequency spectrum sequence of the water leakage signal to obtain a suspected water leakage signal; setting a time range according to the moment when the water leakage signal is suspected to be detected by the first detection equipment, judging whether the water leakage signal is detected in the time sequence signal in the time range corresponding to the second detection equipment, and acquiring a positioning water leakage signal when the water leakage signal is detected; and positioning the position of water leakage on the pipeline by utilizing the time difference between the water leakage signal and the positioning water leakage signal. The invention converts the time sequence signal into the frequency spectrum sequence signal, improves the confidence coefficient of the suspected water leakage signal, verifies the water leakage signal through another detection device and realizes the positioning of the water leakage position.
Description
Technical Field
The invention relates to the technical field of pipeline leakage positioning, in particular to a pipeline leakage detecting and positioning method and a pipeline leakage detecting and positioning system based on spectral line analysis.
Background
The water supply pipeline plays an extremely critical role in long-distance water resource transportation, but most pipelines are easily damaged when being laid in the severe natural environments such as the field or the underground. Once the water supply pipeline is damaged and leaks, the pipeline needs to be repaired in time so as to avoid additional economic loss. Therefore, the rapid detection and positioning of the pipeline leakage have great application value, and scheme guidance can be provided for pipeline maintenance.
At present, most of signal detection and positioning methods for pipeline leakage in a water supply network adopt time-frequency analysis and signal processing means to extract information related to leakage signals from mixed signals acquired from pipelines. However, because the signal-to-noise ratio in the pipeline network is low, the mixed signal is often mixed with stray interference signals and noise, resulting in a very weak leakage signal, and meanwhile, the leakage signal may only exist within a certain time range, resulting in that the strong noise and the interference signal cannot be completely removed from the mixed signal to obtain the leakage signal to be detected. In addition, when the signal-to-noise ratio changes greatly, the traditional time-frequency distribution has great limitation in non-stationary signal processing, and the reconstructed signal still cannot remove the influence and interference of mixed noise, so that the detection classification result corresponding to the extracted leakage signal is unreliable. In summary, the conventional pipeline leakage detection method is affected by noise and interference, and is difficult to extract an accurate leakage signal, so that the detection result is unreliable.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a pipeline leakage detection and positioning method based on spectral line analysis and a system thereof, and can solve the problem that the detection result is unreliable due to the fact that the accurate leakage signal is difficult to extract because of the influence of noise and interference in the conventional pipeline leakage detection method.
The technical scheme for realizing the purpose is as follows:
the invention provides a pipeline leakage detection and positioning method based on spectral line analysis, which comprises the following steps:
providing a first detection device and a second detection device for collecting pipeline signals, and arranging the first detection device and the second detection device on a pipeline at a certain distance;
acquiring a time sequence signal of the pipeline detected by the first detection device, converting the time sequence signal into a frequency spectrum sequence signal, and acquiring a suspected water leakage signal from the frequency spectrum sequence signal;
setting a time range according to the moment when the first detection device detects the suspected water leakage signal, judging whether the water leakage signal is detected in the time sequence signal corresponding to the time range of the second detection device,
when the water leakage signal is not detected, the suspected water leakage signal is judged to be an error signal and is not processed,
and when the water leakage signal is detected, acquiring a positioning water leakage signal, and positioning the position of water leakage on the pipeline by using the suspected water leakage signal and the time difference of the positioning water leakage signal.
The method has the advantages that the method of converting the time sequence signal into the frequency spectrum sequence signal and acquiring the suspected water leakage signal is adopted, the confidence coefficient of the suspected water leakage signal is improved, the influence of noise and interference is avoided, the water leakage signal is further detected by another detection device, the water leakage position is positioned by using time difference, and meanwhile, the false alarm of the error signal serving as the water leakage signal can be prevented.
The pipeline leakage detection and positioning method based on the spectral analysis is further improved in that the step of judging whether a water leakage signal is detected in the time sequence signals corresponding to the second detection device in the time range comprises the following steps:
providing a time series signal of a water leakage signal, matching the time series signal of the water leakage signal in the time series signals of the second detection device in the time range, and judging whether the time series signal of the water leakage signal is matched;
when the time series signal of the water leakage signal is matched, the matched signal is obtained as a positioning water leakage signal,
when the time series signal of the water leakage signal is not matched, converting the suspected water leakage signal into a frequency spectrum series signal, converting the time series signal corresponding to the second detection device into a frequency spectrum series signal, calculating the similarity of the two frequency spectrum series signals, setting a limit value, judging the size of the similarity and the limit value,
when the similarity is smaller than the limit value, the suspected water leakage signal is judged to be an error signal and is not processed,
and when the similarity is greater than or equal to the limit value, selecting the corresponding time series signal as a positioning water leakage signal.
The pipeline leakage detection and positioning method based on the spectral pattern analysis is further improved in that the suspected water leakage signal is converted into a frequency spectrum sequence signal, a time sequence signal corresponding to the second detection device is converted into a frequency spectrum sequence signal, and the calculating of the similarity of the two frequency spectrum sequence signals comprises the following steps:
fourier transform is carried out on the suspected water leakage signal to obtain a frequency spectrum sequence signal X1；
Fourier transform is carried out on the time series signal corresponding to the second detection device to obtain a frequency spectrum series signal X2；
Similarity D (X) of two spectrum sequence signals1,X2) Is composed of
Where k is the number of the spectrum sequence signal and N is the number of the numbers.
The pipeline leakage detection and positioning method based on the spectral line analysis is further improved in that the setting of a time range according to the moment when the first detection device detects the suspected water leakage signal comprises the following steps:
setting a threshold value, judging whether the bandwidth of the suspected water leakage signal exceeds the threshold value,
when the bandwidth of the suspected water leakage signal is smaller than the threshold value, setting the time range to be t-t1,t+t1]，
When the bandwidth of the suspected water leakage signal is larger than or equal to the threshold value, setting the time range to be t-t2,t+t2]，
Wherein t is the moment when the first detection device detects the suspected water leakage signal, and t is the moment when the first detection device detects the suspected water leakage signal2<t1<d/v, wherein d is the distance between the first detection device and the second detection device, and v is the transmission speed of water in the pipeline.
The pipeline leakage detection and positioning method based on the spectral analysis is further improved in that the positioning of the position of water leakage on the pipeline by using the time difference between the suspected water leakage signal and the positioning water leakage signal comprises the following steps:
using formulas
Calculating the time series signal x corresponding to the suspected water leakage signal1Time series signal x corresponding to the positioning water leakage signal2Wherein γ (k) is two sequences (x)1、x2) T is the moment when the first detection channel detects the suspected water leakage signal, k is the serial number of the time series signal, N is the number of the serial numbers,
is a sequence x1The average value of (a) of (b),
is a sequence x2Is measured.
The invention also provides a pipeline leakage detection and positioning system based on spectral line analysis, which comprises:
the first detection device and the second detection device are arranged on the pipeline at a certain distance and are used for collecting pipeline signals;
the matching module is connected with the first detection device and used for acquiring a time sequence signal of the pipeline detected by the first detection device, converting the time sequence signal into a frequency spectrum sequence signal and then acquiring a suspected water leakage signal from the frequency spectrum sequence signal;
a detection module connected to the matching module, configured to set a time range according to a time when the first detection device detects a suspected water leakage signal, determine whether the water leakage signal is detected in the time series signal corresponding to the time range of the second detection device, and determine that the suspected water leakage signal is an error signal and not process the water leakage signal when the water leakage signal is not detected,
when a water leakage signal is detected, acquiring a positioning water leakage signal;
and the positioning module is connected with the detection module and used for positioning the water leakage position on the pipeline by utilizing the suspected water leakage signal and the time difference of the positioning water leakage signal when the water leakage signal is detected.
The pipeline leakage detection and positioning system based on the spectral line analysis is further improved in that the detection module comprises:
the matching unit is used for providing a time series signal of a water leakage signal, matching the time series signal of the water leakage signal in the time series signals of the second detection device in the time range, and judging whether the time series signal of the water leakage signal is matched or not;
when the time series signal of the water leakage signal is matched, acquiring the matched signal as a positioning water leakage signal;
a similarity judging unit connected to the matching unit, for converting the suspected water leakage signal into a frequency spectrum sequence signal when the matching unit is not matched with the time sequence signal of the water leakage signal, converting the time sequence signal corresponding to the second detection device into a frequency spectrum sequence signal, calculating the similarity between the two frequency spectrum sequence signals, setting a limit value, and judging the magnitude of the similarity and the limit value,
when the similarity is smaller than the limit value, the suspected water leakage signal is judged to be an error signal and is not processed,
and when the similarity is greater than or equal to the limit value, selecting the corresponding time series signal as a positioning water leakage signal.
The pipeline leakage detecting and positioning system based on the spectral line analysis is further improved,
the similarity judging unit is used for carrying out Fourier transform on the suspected water leakage signal to obtain a frequency spectrum sequence signal X1；
Fourier transform is carried out on the time series signal corresponding to the second detection device to obtain a frequency spectrum series signal X2；
Similarity D (X) of two spectrum sequence signals1,X2) Is composed of
Where k is the number of the spectrum sequence signal and N is the number of the numbers.
The pipeline leakage detecting and positioning system based on the spectral line analysis is further improved,
the detection module comprises a range setting unit for setting a threshold value and judging whether the bandwidth of the suspected water leakage signal exceeds the threshold value,
when the bandwidth of the suspected water leakage signal is smaller than the threshold value, setting the time range to be t-t1,t+t1]，
When the bandwidth of the suspected water leakage signal is larger than or equal to the threshold value, setting the time range to be t-t2,t+t2]，
Wherein t is the moment when the first detection device detects the suspected water leakage signal, and t is the moment when the first detection device detects the suspected water leakage signal2<t1<d/v, wherein d is the distance between the first detection device and the second detection device, and v is the transmission speed of water in the pipeline.
The pipeline leakage detecting and positioning system based on the spectral line analysis is further improved,
the positioning module is used for utilizing a formula
Calculating the time series signal x corresponding to the suspected water leakage signal1Time series signal x corresponding to the positioning water leakage signal2Wherein γ (k) is two sequences (x)1、x2) T is the moment when the first detection channel detects the suspected water leakage signal, k is the serial number of the time series signal, N is the number of the serial numbers,
is a sequence x1The average value of (a) of (b),
is a sequence x2Is measured.
Drawings
FIG. 1 is a flow chart of the pipeline leakage detection and positioning method based on spectral line analysis according to the present invention.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
Referring to fig. 1, the invention provides a pipeline leakage detection and positioning method based on spectral line analysis, which solves the problem that the detection result is unreliable due to the fact that the current pipeline leakage detection method is difficult to extract accurate leakage signals by utilizing the characteristics that the confidence coefficient of the spectral line analysis is high and the influence of noise and interference can be avoided. The pipeline leakage detection and positioning method based on spectral line analysis of the invention is explained below with reference to the accompanying drawings.
As shown in fig. 1, the pipeline leakage detection and positioning method based on spectral line analysis of the present invention includes:
step S1 is executed: providing a first detection device and a second detection device for collecting pipeline signals, and arranging the first detection device and the second detection device on the pipeline at a certain distance. Step S2 is then performed.
Step S2 is executed: and acquiring a time sequence signal of the pipeline detected by the first detection device, converting the time sequence signal into a frequency spectrum sequence signal, matching the frequency spectrum sequence of the water leakage signal, and then obtaining the water leakage signal.
Step S2 specifically includes the following steps:
setting a time window, wherein the size of the time window is determined according to the single duration of the leak point sound, acquiring a time series signal of a pipeline detected by first detection equipment in the time window, and performing Fourier transform on the time series signal to convert the time series signal into a frequency spectrum series signal;
providing a frequency spectrum sequence of the water leakage signal, and detecting the suspected water leakage signal in the converted frequency spectrum sequence signal according to the frequency spectrum sequence characteristic of the water leakage signal;
when the suspected water leakage signal is not detected, the time window is pushed forward, the pushing amount is generally 1/3-1/2 of the length of the time window, the suspected water leakage signal is detected again in the frequency spectrum sequence signal corresponding to the time sequence signal obtained in the pushed time window, and the step is repeated until the suspected water leakage signal is detected and obtained. Step S3 is then performed.
Step S3 is executed: setting a time range according to the moment when the water leakage signal is suspected to be detected by the first detection equipment;
specifically, a threshold value is set, whether the bandwidth of the suspected water leakage signal exceeds the threshold value is judged,
when the bandwidth of the suspected water leakage signal is smaller than the threshold value, the confidence of the suspected water leakage signal is judged to be high, the water leakage position is closer to the first detection equipment, and therefore the time range is set to be [ t-t ]1,t+t1]，
When the bandwidth of the suspected water leakage signal is larger than or equal to the threshold value, the confidence coefficient of the suspected water leakage signal is judged to be low, the water leakage position is near the central positions of the first detection device and the second detection device, and therefore the time range is set to be [ t-t ]2,t+t2]，
Wherein t is the moment when the first detection device detects the suspected water leakage signal, and t is the moment when the first detection device detects the suspected water leakage signal2<t1<d/v, wherein d is the distance between the first detection device and the second detection device, and v is the transmission speed of water in the pipeline.
Providing a time series signal of a water leakage signal, matching the time series signal of the water leakage signal in the time series signal corresponding to the time range of the second detection device, and judging whether the time series signal of the water leakage signal is matched;
when the time series signal of the water leakage signal is matched, acquiring the matched signal as a positioning water leakage signal, and executing the step S5;
when the time-series signal of the water leakage signal is not matched, step S4 is executed.
Step S4 is executed: converting the suspected water leakage signal into a frequency spectrum sequence signal, converting a time sequence signal corresponding to the second detection device into a frequency spectrum sequence signal, and calculating the similarity of the two frequency spectrum sequence signals;
wherein the time series signal corresponding to the second detection device is in [ t-t ] above1,t+t1]Selecting the time window in the range according to the suspected water leakage signal detected by the first detection equipment;
specifically, the suspected water leakage signal is subjected to Fourier transform to obtain a frequency spectrum sequence signal X1；
Fourier transform is carried out on the time series signal corresponding to the second detection device to obtain a frequency spectrum series signal X2；
Similarity D (X) of two spectrum sequence signals1,X2) Is composed of
Where k is the number of the spectrum sequence signal and N is the number of the numbers.
Setting a limit value, and judging the size of the similarity and the limit value;
when the similarity is smaller than the limit value, judging that the suspected water leakage signal is an error signal, and not processing the suspected water leakage signal;
when the similarity is greater than or equal to the limit value, the corresponding time series signal is selected as a positioning water leakage signal, and step S5 is executed.
Step S5 is executed: and positioning the position of water leakage on the pipeline by utilizing the time difference between the water leakage signal and the positioning water leakage signal.
Step S5 specifically includes:
using formulas
Calculating the time series signal x corresponding to the suspected water leakage signal1Time series signal x corresponding to the positioning water leakage signal2Time phase ofIn which γ (k) is two sequences (x)1、x2) T is the moment when the first detection channel detects the suspected water leakage signal, k is the serial number of the time series signal, N is the number of the serial numbers,
is a sequence x1The average value of (a) of (b),
is a sequence x2Is measured.
Finally, the suspected water leak signal in the first detection device and the localized water leak signal in the second detection device are marked so as not to be repeatedly detected.
The present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 1, the pipeline leakage detecting and positioning system based on spectral line analysis of the present invention comprises:
the first detection device and the second detection device are arranged on the pipeline at a certain distance and used for collecting pipeline signals.
And the matching module is connected with the first detection device and used for acquiring a time sequence signal of the pipeline detected by the first detection device, converting the time sequence signal into a frequency spectrum sequence signal and matching the frequency spectrum sequence of the water leakage signal to obtain the suspected water leakage signal.
Specifically, the matching module sets a time window, the size of the time window is determined according to the single duration of the leakage point sound, a time series signal of the pipeline detected by the first detection device in the time window is obtained, and the time series signal is subjected to Fourier transform and converted into a frequency spectrum series signal;
providing a frequency spectrum sequence of the water leakage signal, and detecting the suspected water leakage signal in the frequency spectrum sequence signal according to the frequency spectrum sequence characteristic of the water leakage signal;
when the suspected water leakage signal is not detected, the time window is pushed forward, the pushing amount is generally 1/3-1/2 of the length of the time window, the suspected water leakage signal is detected again in the frequency spectrum sequence signal corresponding to the time sequence signal obtained in the pushed time window, and the step is repeated until the suspected water leakage signal is detected and obtained.
The detection module is connected with the matching module and used for setting a time range according to the moment when the first detection device detects the suspected water leakage signal, judging whether the water leakage signal is detected in the time sequence signal corresponding to the time range of the second detection device, judging that the suspected water leakage signal is an error signal when the water leakage signal is not detected, not processing the water leakage signal, and acquiring a positioning water leakage signal when the water leakage signal is detected;
the detection module comprises:
a range setting unit for setting a threshold value, determining whether the bandwidth of the suspected water leakage signal exceeds the threshold value,
when the bandwidth of the suspected water leakage signal is smaller than the threshold value, setting the time range to be t-t1,t+t1]，
When the bandwidth of the suspected water leakage signal is larger than or equal to the threshold value, setting the time range to be t-t2,t+t2]，
Wherein t is the moment when the first detection device detects the suspected water leakage signal, and t is the moment when the first detection device detects the suspected water leakage signal2<t1<d/v, wherein d is the distance between the first detection device and the second detection device, and v is the transmission speed of water in the pipeline.
The matching unit is connected with the range setting unit and used for providing a time series signal of a water leakage signal, matching the time series signal of the water leakage signal in the time series signals of the second detection device in the time range and judging whether the time series signal of the water leakage signal is matched or not;
when the time series signal of the water leakage signal is matched, acquiring the matched signal as a positioning water leakage signal;
a similarity judging unit connected to the matching unit for judging whether the matching unit matches the time-series signal of the water leakage signal,fourier transform is carried out on the suspected water leakage signal to obtain a frequency spectrum sequence signal X1Performing Fourier transform on the time series signal corresponding to the second detection device to obtain a frequency spectrum series signal X2Wherein the time series signal corresponding to the second detection device is [ t-t ] as described above1,t+t1]The range is selected according to the time window of the suspected water leakage signal detected by the first detection device,
calculating the similarity D (X) of two frequency spectrum sequence signals1,X2) Is composed of
Wherein k is the number of the frequency spectrum sequence signal, and N is the number of the number;
the similarity judging unit is also used for setting a limit value, judging the similarity and the size of the limit value,
when the similarity is smaller than the limit value, the similarity judgment unit judges that the suspected water leakage signal is an error signal and does not process the suspected water leakage signal,
and when the similarity is greater than or equal to the limit value, the similarity judgment unit selects the corresponding time series signal as the positioning water leakage signal.
And the positioning module is connected with the matching module and the detection module and is used for positioning the water leakage position on the pipeline by utilizing the suspected water leakage signal and the time difference of the positioning water leakage signal.
In particular, the location module is configured to utilize a formula
Calculating the time series signal x corresponding to the suspected water leakage signal1Time series signal x corresponding to the positioning water leakage signal2Wherein γ (k) is two sequences (x)1、x2) T is the moment when the first detection channel detects the suspected water leakage signal, and k is the time sequenceThe number of signals, N being the number of numbers,
is a sequence x1The average value of (a) of (b),
is a sequence x2Is measured.
The pipeline leakage detection and positioning method and system based on spectral line analysis have the beneficial effects that:
the method of converting the time sequence signal into the frequency spectrum sequence signal and matching the frequency spectrum sequence of the water leakage signal is adopted, the confidence coefficient of the water leakage signal is improved, and the influence of noise and interference is avoided.
The first detection device and the second detection device are arranged on the pipeline to detect the water leakage signal, so that the water leakage position is positioned by using time difference on one hand, and the suspected water leakage signal is verified on the other hand, so that the detection precision is improved, the error signal is prevented from being mistakenly reported as the water leakage signal, and the false alarm probability is reduced;
furthermore, the signal of the second detection device is directly matched with the suspected water leakage signal, and similarity analysis is performed when the signal is not matched, so that the detection precision is ensured, and the processing speed is increased.
While the present invention has been described in detail and with reference to the embodiments thereof as illustrated in the accompanying drawings, it will be apparent to one skilled in the art that various changes and modifications can be made therein. Therefore, certain details of the embodiments are not to be interpreted as limiting, and the scope of the invention is to be determined by the appended claims.
Claims (10)
1. A pipeline leakage detection and positioning method based on spectral line analysis is characterized by comprising the following steps:
providing a first detection device and a second detection device for collecting pipeline signals, and arranging the first detection device and the second detection device on a pipeline at a certain distance;
acquiring a time sequence signal of the pipeline detected by the first detection device, converting the time sequence signal into a frequency spectrum sequence signal, and acquiring a suspected water leakage signal from the frequency spectrum sequence signal;
setting a time range according to the moment when the first detection device detects the suspected water leakage signal, judging whether the water leakage signal is detected in the time sequence signal corresponding to the time range of the second detection device,
when the water leakage signal is not detected, the suspected water leakage signal is judged to be an error signal and is not processed,
and when the water leakage signal is detected, acquiring a positioning water leakage signal, and positioning the position of water leakage on the pipeline by using the suspected water leakage signal and the time difference of the positioning water leakage signal.
2. The pipe leak detection and localization method based on spectral analysis of claim 1, wherein determining whether a water leak signal is detected in the time series signals corresponding to the time range of the second detection device further comprises:
providing a time series signal of a water leakage signal, matching the time series signal of the water leakage signal in the time series signals of the second detection device in the time range, and judging whether the time series signal of the water leakage signal is matched;
when the time series signal of the water leakage signal is matched, the matched signal is obtained as a positioning water leakage signal,
when the time series signal of the water leakage signal is not matched, converting the suspected water leakage signal into a frequency spectrum series signal, converting the time series signal corresponding to the second detection device into a frequency spectrum series signal, calculating the similarity of the two frequency spectrum series signals, setting a limit value, judging the size of the similarity and the limit value,
when the similarity is smaller than the limit value, the suspected water leakage signal is judged to be an error signal and is not processed,
and when the similarity is greater than or equal to the limit value, selecting the corresponding time series signal as a positioning water leakage signal.
3. The pipe leakage detecting and positioning method based on the spectral analysis of claim 2, wherein the suspected water leakage signal is converted into a spectrum sequence signal, and a time sequence signal corresponding to the second detection device is converted into a spectrum sequence signal, and calculating the similarity between the two spectrum sequence signals comprises:
fourier transform is carried out on the suspected water leakage signal to obtain a frequency spectrum sequence signal X1；
Fourier transform is carried out on the time series signal corresponding to the second detection device to obtain a frequency spectrum series signal X2；
Similarity D (X) of two spectrum sequence signals1,X2) Is composed of
Where k is the number of the spectrum sequence signal and N is the number of the numbers.
4. The method of claim 1, wherein setting a time range according to the moment when the first detection device detects the suspected water leakage signal comprises:
setting a threshold value, judging whether the bandwidth of the suspected water leakage signal exceeds the threshold value,
when the bandwidth of the suspected water leakage signal is smaller than the threshold value, setting the time range to be t-t1,t+t1]，
When the bandwidth of the suspected water leakage signal is larger than or equal to the threshold value, setting the time range to be t-t2,t+t2]，
Wherein t is the moment when the first detection device detects the suspected water leakage signal, and t is the moment when the first detection device detects the suspected water leakage signal2<t1<d/v, wherein d is the distance between the first detection device and the second detection device, and v is the transmission speed of water in the pipeline.
5. The method of claim 1, wherein locating a location of a water leak on a pipe using the suspected water leak signal and the time difference of the located water leak signal comprises:
using formulas
Calculating the time series signal x corresponding to the suspected water leakage signal1Time series signal x corresponding to the positioning water leakage signal2Wherein γ (k) is two sequences (x)1、x2) T is the moment when the first detection channel detects the suspected water leakage signal, k is the serial number of the time series signal, N is the number of the serial numbers,
is a sequence x1The average value of (a) of (b),
is a sequence x2Is measured.
6. A pipeline leakage detection and positioning system based on spectral line analysis is characterized by comprising:
the first detection device and the second detection device are arranged on the pipeline at a certain distance and are used for collecting pipeline signals;
the matching module is connected with the first detection device and used for acquiring a time sequence signal of the pipeline detected by the first detection device, converting the time sequence signal into a frequency spectrum sequence signal and then acquiring a suspected water leakage signal from the frequency spectrum sequence signal;
a detection module connected to the matching module, configured to set a time range according to a time when the first detection device detects a suspected water leakage signal, determine whether the water leakage signal is detected in the time series signal corresponding to the time range of the second detection device, and determine that the suspected water leakage signal is an error signal and not process the water leakage signal when the water leakage signal is not detected,
when a water leakage signal is detected, acquiring a positioning water leakage signal;
and the positioning module is connected with the detection module and used for positioning the water leakage position on the pipeline by utilizing the suspected water leakage signal and the time difference of the positioning water leakage signal when the water leakage signal is detected.
7. The spectral print analysis-based pipe leak detection and localization system of claim 6, wherein said detection module comprises:
the matching unit is used for providing a time series signal of a water leakage signal, matching the time series signal of the water leakage signal in the time series signals of the second detection device in the time range, and judging whether the time series signal of the water leakage signal is matched or not;
when the time series signal of the water leakage signal is matched, acquiring the matched signal as a positioning water leakage signal;
a similarity judging unit connected to the matching unit, for converting the suspected water leakage signal into a frequency spectrum sequence signal when the matching unit is not matched with the time sequence signal of the water leakage signal, converting the time sequence signal corresponding to the second detection device into a frequency spectrum sequence signal, calculating the similarity between the two frequency spectrum sequence signals, setting a limit value, and judging the magnitude of the similarity and the limit value,
when the similarity is smaller than the limit value, the suspected water leakage signal is judged to be an error signal and is not processed,
and when the similarity is greater than or equal to the limit value, selecting the corresponding time series signal as a positioning water leakage signal.
8. The system for pipeline leak detection and location based on spectral print analysis of claim 7,
the similarity determinationThe unit is used for carrying out Fourier transform on the suspected water leakage signal to obtain a frequency spectrum sequence signal X1；
Fourier transform is carried out on the time series signal corresponding to the second detection device to obtain a frequency spectrum series signal X2；
Similarity D (X) of two spectrum sequence signals1,X2) Is composed of
Where k is the number of the spectrum sequence signal and N is the number of the numbers.
9. The system for pipeline leak detection and location based on spectral print analysis of claim 6,
the detection module comprises a range setting unit for setting a threshold value and judging whether the bandwidth of the suspected water leakage signal exceeds the threshold value,
when the bandwidth of the suspected water leakage signal is smaller than the threshold value, setting the time range to be t-t1,t+t1]，
When the bandwidth of the suspected water leakage signal is larger than or equal to the threshold value, setting the time range to be t-t2,t+t2]，
Wherein t is the moment when the first detection device detects the suspected water leakage signal, and t is the moment when the first detection device detects the suspected water leakage signal2<t1<d/v, wherein d is the distance between the first detection device and the second detection device, and v is the transmission speed of water in the pipeline.
10. The system for pipeline leak detection and location based on spectral print analysis of claim 6,
the positioning module is used for utilizing a formula
Calculating the time series signal x corresponding to the suspected water leakage signal1Time series signal x corresponding to the positioning water leakage signal2Wherein γ (k) is two sequences (x)1、x2) T is the moment when the first detection channel detects the suspected water leakage signal, k is the serial number of the time series signal, N is the number of the serial numbers,
is a sequence x1The average value of (a) of (b),
is a sequence x2Is measured.
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