CN111076097B - Method and device for extracting effective signal from pipeline leakage acoustic emission signal - Google Patents
Method and device for extracting effective signal from pipeline leakage acoustic emission signal Download PDFInfo
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Abstract
The invention relates to a method and a device for extracting an effective signal from a pipeline leakage acoustic emission signal. Judging whether the RMS of each probe on each pipeline exceeds a set RMS threshold value; when the RMS of at least one probe exceeds an RMS threshold value, acquiring the RMS of each probe on the pipeline where the at least one probe is positioned, and dividing the RMS of every three adjacent probes of the same pipeline into a group; judging whether the maximum RMS in each group exceeds a set RMS threshold value, and judging whether the probe of the maximum RMS in the corresponding group meets a preset rule when the maximum RMS exceeds the RMS threshold value; calculating a leak rate and a leak location according to the maximum RMS, sub-maximum RMS, and the distance between the maximum RMS probe and the sub-maximum RMS probe in the group when a preset rule is satisfied; and judging whether the calculated leakage rate is greater than a set leakage rate threshold value or not, and when the calculated leakage rate is greater than the set leakage rate threshold value, alarming and outputting a leakage position. And the acoustic emission signals required by calculating the leakage rate and the leakage position are ensured to be effective.
Description
Technical Field
The invention belongs to the technical field of pipeline leakage detection, and particularly relates to a method and a device for extracting an effective signal from a pipeline leakage acoustic emission signal.
Background
The acoustic emission leakage detection technology adopted at present is used for pipeline leakage monitoring and can realize quantitative and positioning measurement of pipeline leakage, for example, chinese patent application documents with publication number CN102242871A and name 'deep sea carrier hydraulic pipeline leakage acoustic emission source positioning method' filed 7.7.2011 are disclosed. The method for positioning the pipeline leakage sound emission source disclosed by the document comprises the steps of firstly arranging a sound emission sensor probe on a pipeline at a certain distance, respectively connecting a control system, taking 3 sound emission sensors which are sequentially arranged as a group of sensor arrays, respectively and simultaneously collecting a leakage sound emission signal of a hydraulic pipeline of a deep sea carrier by the 3 sound emission sensor probes, and then calculating the distance between the pipeline leakage point and a first sound emission sensor in the sensor probe array according to a characteristic parameter, namely effective value voltage (RMS) of the sound emission signal detected by the sensor probe array. Where RMS represents the acoustic emission signal intensity in units of voltage V.
When the pipeline leaks, an empirical formula (1) of the relation between the effective value voltage and the leakage rate of the pipeline and an empirical formula (2) of the relation between the effective value voltage and the propagation distance in an exponential decay mode are as follows:
G＝a*RMS b (1)
RMS LM ＝RMS*e -c*L (2)
here, G is the pipeline leakage rate; RMS is the effective value voltage of the leakage point; a. b is the pipeline leakage coefficient; c is the pipeline attenuation coefficient; RMS LM RMS value at L meters from the leak point. When a certain point of the pipeline leaks, according to the principle, the probes on two sides of the leakage point are firstly determined from the plurality of probes, and then the leakage rate and the leakage position of the leakage point can be calculated by integrating the RMS value and the distance between the two probes. However, as described in the above patent publications, according to the basic principle of acoustic emission leakage detection technology, a large number of acoustic emission instrument measurement points need to be arranged on a monitoring pipeline, all acoustic emission instrument signals of different pipelines and different measurement points are transmitted to a control system for collection, and most of the large number of data signals collected by the method are invalid signals. If the validity of the data cannot be judged, on one hand, the load of a processor is increased by the calculated amount of a large amount of invalid data, so that the system is unstable, and on the other hand, if the valid data cannot be correctly extracted, wrong calculation of the data can be caused, and false alarm and wrong report can be caused. Therefore, the premise of adopting the basic principle of the acoustic emission leakage detection technology to detect the leakage is that the validity analysis and correct extraction must be carried out on the pipeline leakage acoustic emission characteristic signal.
In view of this, the present disclosure provides a method for analyzing and extracting the validity of a pipeline leakage acoustic emission characteristic signal by comprehensively analyzing various aspects such as the leakage measurement principle of an acoustic emission instrument and the arrangement characteristics of measurement points, so that valid data which can be used for leakage calculation can be correctly extracted to participate in the subsequent quantitative and positioning calculation of pipeline leakage.
Disclosure of Invention
In view of the shortcomings in the prior art, it is an object of the present invention to provide a method and apparatus for extracting a valid signal from a pipe leakage acoustic emission signal. The method and the device can correctly extract the RMS values at two sides of the leakage point and the distance between the two probes to participate in the quantitative and positioning calculation of the leakage rate.
In order to achieve the above purposes, the invention adopts the technical scheme that:
in one aspect, a method of extracting a valid signal from a pipe leak acoustic emission signal is presented. The method for extracting the effective signal from the pipeline leakage acoustic emission signal comprises the following steps: judging whether the effective value voltage collected by each acoustic emission probe on each pipeline exceeds a set effective value voltage threshold value or not; when the effective value voltage of at least one acoustic emission probe exceeds the set effective value voltage threshold, acquiring the effective value voltage acquired by each acoustic emission probe on the pipeline where the at least one acoustic emission probe is positioned, and dividing the effective value voltage acquired by every three adjacent acoustic emission probes on the same pipeline into a group; judging whether the maximum effective value voltage in each group exceeds the set effective value voltage threshold, and judging whether an acoustic emission probe collecting the maximum effective value voltage in the corresponding group meets a preset rule when the maximum effective value voltage in each group exceeds the set effective value voltage threshold; when the acoustic emission probe which acquires the maximum effective value voltage in the corresponding group meets the preset rule, calculating the leakage rate and the leakage position according to the maximum effective value voltage, the next largest effective value voltage in the group and the distance between the acoustic emission probe which acquires the maximum effective value voltage and the acoustic emission probe which acquires the next largest effective value voltage; and judging whether the calculated leakage rate is greater than a set leakage rate threshold value or not, and alarming and outputting the leakage position when the calculated leakage rate is greater than the set leakage rate threshold value.
Further, the acoustic emission probe with the preset rule that the group collects the maximum effective value voltage is the acoustic emission probe arranged in the middle of the group according to the arrangement sequence on the pipeline, or the first acoustic emission probe or the last acoustic emission probe arranged in the pipeline according to the arrangement sequence among all the acoustic emission probes.
Further, when the calculated leak rate is greater than the set leak rate threshold, alarming and outputting the leak location includes: and when the calculated leakage rate is greater than the set leakage rate threshold value, judging whether the duration time of the leakage rate greater than the set leakage rate threshold value is greater than a set time length, and when the duration time is greater than the set time length, alarming and outputting the leakage position.
Further, before determining whether the effective value voltage collected by each acoustic emission probe on each pipeline exceeds the set effective value voltage threshold, the method for extracting effective signals from pipeline leakage acoustic emission signals further comprises: and respectively forming data vectors by the effective value voltage acquired by each acoustic emission probe, the serial number of the acoustic emission probe, the distance between the acoustic emission probe and the adjacent front acoustic emission probe and the distance between the acoustic emission probe and the adjacent rear acoustic emission probe.
Further, the alarm is to output the leakage rate and/or to emit at least one of an audible and a visible alarm signal.
And further, circularly and sequentially processing or parallelly processing each pipeline, and circularly and sequentially processing or parallelly processing each acoustic emission probe on each pipeline.
In another aspect, an apparatus for extracting a valid signal from a pipe leak acoustic emission signal is provided. The device for extracting the effective signal from the pipeline leakage acoustic emission signal comprises: the pipeline abnormity determining unit is used for judging whether the effective value voltage collected by each acoustic emission probe on each pipeline exceeds a set effective value voltage threshold value; the grouping unit is used for acquiring the effective value voltage acquired by each acoustic emission probe on the pipeline where the at least one acoustic emission probe is positioned when the effective value voltage of the at least one acoustic emission probe exceeds the set effective value voltage threshold, and dividing the effective value voltages acquired by every three adjacent acoustic emission probes on the same pipeline into a group; the leakage position analysis unit is used for judging whether the maximum effective value voltage in each group exceeds the set effective value voltage threshold value or not, and judging whether an acoustic emission probe which collects the maximum effective value voltage in the corresponding group meets a preset rule or not when the maximum effective value voltage in each group exceeds the set effective value voltage threshold value; the calculation unit is used for calculating the leakage rate and the leakage position according to the maximum effective value voltage and the next maximum effective value voltage in the group and the distance between the acoustic emission probe for collecting the maximum effective value voltage and the acoustic emission probe for collecting the next maximum effective value voltage when the acoustic emission probe for collecting the maximum effective value voltage in the corresponding group meets the preset rule; and the leakage rate judging unit is used for judging whether the calculated leakage rate is greater than a set leakage rate threshold value or not, and when the calculated leakage rate is greater than the set leakage rate threshold value, alarming and outputting the leakage position.
Further, the acoustic emission probe with the preset rule that the group collects the maximum effective value voltage is the acoustic emission probe arranged in the middle of the group according to the arrangement sequence on the pipeline, or the first acoustic emission probe or the last acoustic emission probe arranged in the pipeline according to the arrangement sequence among all the acoustic emission probes.
Further, the leak rate determination unit includes: and the timing module is used for judging whether the duration time of the leakage rate greater than the set leakage rate threshold value is greater than the set time length or not when the calculated leakage rate is greater than the set leakage rate threshold value, and alarming and outputting the leakage position when the duration time is greater than the set time length.
Further, the apparatus for extracting a valid signal from a pipeline leakage acoustic emission signal further comprises: and the data vector generating unit is used for respectively forming data vectors by the effective value voltage collected by each acoustic emission probe, the serial number of the acoustic emission probe, the distance between the acoustic emission probe and the adjacent front acoustic emission probe and the distance between the acoustic emission probe and the adjacent rear acoustic emission probe before judging whether the effective value voltage collected by each acoustic emission probe on each pipeline exceeds the set effective value voltage threshold.
The effect of this disclosure is as follows:
the method and the device for extracting the effective signal from the pipeline leakage acoustic emission signal greatly reduce the data calculation load, ensure the stability of the whole system, ensure the effectiveness and the correctness of the acoustic emission characteristic signal required by the calculation of the leakage rate and the leakage position, and have high safety and reliability.
Drawings
FIG. 1 is a flow chart of a method for extracting a valid signal from a pipeline leakage acoustic emission signal provided in embodiment 1 of the present disclosure;
fig. 2 is a schematic diagram of a multi-channel acoustic emission probe arrangement provided by an example of the present disclosure;
FIG. 3 is a flowchart of a method for extracting a valid signal from a pipeline leakage acoustic emission signal according to embodiment 2 of the present disclosure;
FIG. 4 is a schematic diagram of a single pipe probe arrangement and array parameter information provided by an example of the present disclosure;
FIGS. 5a and 5b are schematic diagrams of probe position and RMS intensity, respectively, for two possible scenarios in scenario 1 provided by an example of the present disclosure;
FIG. 6 is a schematic of case 2 probe position and RMS intensity provided by an example of the present disclosure;
FIG. 7 is a schematic of case 3 probe position and RMS intensity provided by an example of the present disclosure;
fig. 8 is a schematic structural diagram of an apparatus for extracting a valid signal from a pipeline leakage acoustic emission signal according to an embodiment of the present disclosure.
Detailed Description
The invention is further described with reference to the following figures and detailed description.
Fig. 1 is a flowchart of a method for extracting a valid signal from a pipeline leakage acoustic emission signal according to embodiment 1 of the present disclosure. According to the basic principle of the acoustic emission leakage detection technology, it is assumed that a total of n acoustic emission probes are arranged on m pipelines as shown in fig. 2. As shown in fig. 1, the method comprises the steps of:
and step S110, the control system receives the effective value voltage collected by each acoustic emission probe of each pipeline.
And step S120, judging whether the effective value voltage collected by each acoustic emission probe on each pipeline exceeds a set effective value voltage threshold value. If the effective value voltage of at least one acoustic emission probe in each acoustic emission probe on each pipeline exceeds the set effective value voltage threshold, the flow goes to step S130; if no valid value voltage of the acoustic emission probe exceeds the set valid value voltage threshold, the flow returns to step S110.
Step S130, effective value voltages collected by each acoustic emission probe on the pipeline where at least one acoustic emission probe is located are obtained, and the effective value voltages collected by every three adjacent acoustic emission probes on the same pipeline are divided into a group.
Firstly, RMS values collected by all the acoustic emission probes are received, and the characteristic parameters (including probe serial numbers, distances between the acoustic emission probes and front and rear probes, and the like) of each acoustic emission probe and the collected RMS values are assigned in a one-to-one correspondence mode. And then, splitting the data of the acoustic emission probe according to the number of the pipelines, and respectively adding the characteristic values of different pipelines and the serial numbers of the probes in the pipelines. In order to avoid increasing the calculation load during invalid operation, signals collected by the acoustic emission probes are screened before leakage calculation is performed, when the collection value of the probe exceeds a set effective value voltage threshold value, the pipeline is considered to be abnormal, each acoustic emission probe of the pipeline is led into calculation, otherwise, the calculation processing link is not started, data of other acoustic emission probes are continuously scanned, and therefore the calculation load is greatly reduced on the premise that the monitoring capability is guaranteed. When the RMS value acquired by at least one acoustic emission probe exceeds a set effective value voltage threshold, sequentially extracting the data of each acoustic emission probe of the pipeline in which the at least one acoustic emission probe is positioned by taking three probes as a group and entering a processing link.
Step S140 determines whether the maximum effective value voltage in each group exceeds a set effective value voltage threshold. When the set effective value voltage threshold is exceeded, the flow proceeds to step S150. If the maximum effective value voltage in the current group does not exceed the set effective value voltage threshold, the process returns to step S140, and determines whether the maximum effective value voltage in the next group exceeds the set effective value voltage threshold.
And S150, judging whether the acoustic emission probe which collects the maximum effective value voltage in the corresponding group meets a preset rule or not. If the acoustic emission probe collecting the maximum effective value voltage in the corresponding group meets the preset rule, the flow goes to step S160. And if the acoustic emission probes collecting the maximum effective value voltage in the corresponding group do not meet the preset rule, returning the process to the step S140 to process the next group, and if the acoustic emission probes do not meet the preset rule, returning the process to the step S120 to process the next pipeline.
The preset rule can be that the acoustic emission probe which collects the maximum effective value voltage in the corresponding group is the acoustic emission probe which is arranged in the middle of the group according to the arrangement sequence on the pipeline, or the first acoustic emission probe or the last acoustic emission probe which is arranged in the pipeline according to the arrangement sequence in all the acoustic emission probes.
The randomness of the leakage positions on the pipeline needs to be analyzed one by one aiming at all possible leakage positions, firstly, the signal intensity arrangement of the acoustic emission probes and the sequence numbers of the probes are used for judging whether the leakage points are positioned in the covering range of the acoustic emission probes or close to the edge positions of two ends of the pipeline, if the leakage points are positioned close to the edge positions of the two ends of the pipeline, the nearest acoustic emission probes are selected for calculation, and if the leakage points are positioned between the two acoustic emission probes, the nearest acoustic emission probes on two sides of the leakage points are selected for calculation.
Step S160, calculating the leakage rate and the leakage position according to the maximum effective value voltage, the next largest effective value voltage, and the distance between the acoustic emission probe collecting the maximum effective value voltage and the acoustic emission probe collecting the next largest effective value voltage in the group.
After the acoustic emission probes participating in the calculation are determined, the maximum RMS, the next maximum RMS and the probe spacing are extracted from the group in which the acoustic emission probes are located, and the leakage rate and the leakage position are calculated according to the maximum RMS, the next maximum RMS and the probe spacing.
Step S170, determining whether the calculated leak rate is greater than a set leak rate threshold. If the calculated leak rate is greater than the set leak rate threshold, the flow proceeds to step S180. If the calculated leak rate is not greater than the set leak rate threshold, the flow returns to step S140 to process the next set, and if there is no next set, the flow returns to step S120 to process the next pipe.
And step S180, alarming and outputting the leakage position. The alarm may be an output leak rate and/or an audible or visual alarm. After the step S180 is completed, the flow returns to the step S140 to process the next group, and if there is no next group, the flow returns to the step S120 to process the next pipe.
The calculated result of the leakage rate is analyzed, and the pipeline can be confirmed to be leaked only when the leakage rate is larger than the set leakage rate threshold value, so that the calculated leakage rate and the calculated leakage position are output when the leakage rate exceeds the set leakage rate threshold value in the embodiment, and/or leakage alarm is performed to inform an operator to take corresponding action as soon as possible, and the operation safety of the pipeline is guaranteed. And if the leakage rate is less than or equal to the set leakage rate threshold value, not alarming and outputting, and continuously calculating and analyzing the acquisition values of other acoustic emission probes.
The short-term noise interference possibly generated on the pipeline is eliminated through comprehensive consideration, and the duration time that the leakage rate is greater than the set leakage rate threshold value can be required to exceed the set duration time so as to eliminate the short-term signal abnormal oscillation. If the duration time of the leakage rate larger than the set leakage rate threshold value does not exceed the set duration time, alarming and outputting are not carried out, and the acquisition values of other acoustic emission probes are continuously calculated and analyzed. Wherein the set duration is adjustable.
The pipelines can be processed in a circulating mode in sequence as described in embodiment 1 and can also be processed in parallel, and the acoustic emission probes on the pipelines can be processed in a circulating mode in sequence as described in embodiment 1 and can also be processed in parallel.
Fig. 3 is a flowchart of a method for extracting a valid signal from a pipeline leakage acoustic emission signal according to embodiment 2 of the present disclosure. Still referring to FIG. 2, assume that a total of n acoustic emission probes are disposed on the m pipes. As shown in fig. 3, the method comprises the steps of:
and S310, the control system receives the acoustic emission RMS values collected by the n acoustic emission probes, and the probe serial number of each acoustic emission probe, the RMS value collected by the acoustic emission probe, the distance between the acoustic emission probe and the adjacent front acoustic emission probe and the distance between the acoustic emission probe and the adjacent rear acoustic emission probe form a vector. The vectors of all acoustic emission probes for all the pipes are combined into an array of 4 x n dimensional data. In the array, line 1 is the probe number, line 2 is the RMS value that the acoustic emission probe gathered, line 3 is the distance between the acoustic emission probe and the adjacent front acoustic emission probe, line 4 is the distance between the acoustic emission probe and the adjacent rear acoustic emission probe.
Step S320, splitting the 4 x n dimensional data according to the number m of the pipelines, wherein the m pipelines respectively correspond to the respective arrays of 4 x n 1 、4*n 2 、……、4*n m-1 、4*n m Where n = n 1 +n 2 +……+n m-1 +n m . Taking the ith pipeline as an example, the acoustic emission probe layout information and the array 4 x n i As shown in fig. 4.
And step S330, firstly, comparing the RMS values collected by the acoustic emission probes with a threshold value to avoid invalid operation, respectively finding out the maximum RMS value from the RMS values collected by all the acoustic emission probes of all the pipelines to simplify the algorithm, and judging whether the maximum RMS value exceeds a set RMS threshold value A1. If the maximum RMS value exceeds the set RMS threshold A1, the pipeline is abnormal, the pipeline data enters the next operation, otherwise, the next group of collected data is subjected to cycle threshold comparison.
In step S340, assuming that the maximum RMS value of the ith pipeline exceeds the set RMS threshold A1, the pipeline data 4 × n is obtained i After extraction, according to array sequence numbers 1-3, 2-4, 3-5, 8230, j-j + 2, 8230, n i -2～n i (cycle number j =1 to n) i -2) sequentially extracting 4 x 3 dimensional arrays and comparing the columns with the maximum RMS value in the arrays, wherein the 4 x 3 dimensional arrays meeting at least one of the following three conditions belong to valid data.
Case 1) column 2 RMS value is maximum and greater than the set RMS threshold A1. (Probe arrangement and RMS intensity see FIGS. 5a and 5 b)
Case 2) column 1 RMS value is the largest and greater than the set RMS threshold A1, and column 1 RMS value corresponds to probe number 1. (the most marginal signal is strongest, probe placement and RMS intensity see FIG. 6).
Case 3) column 3 RMS value is maximum and greater than the set RMS threshold A1, and column 3 RMS value corresponds to probe number n i (most peripheral)The strongest signal at the edge, probe placement and RMS intensity see figure 7).
And S350), extracting the maximum RMS, the maximum RMS frequency and the distance L between the maximum RMS acoustic emission probe and the maximum RMS frequency acoustic emission probe from the array meeting at least one of the conditions 1) -3), and inputting the extracted distance L into a leakage rate quantitative formula (3) and a positioning calculation formula (4) for calculation to obtain the leakage rate and the leakage position.
And step S360, when the calculated leakage rate is greater than a set leakage rate threshold value A2 and the duration time exceeds a set time length T seconds, indicating that the pipeline has large leakage, alarming and outputting the leakage position, timely reminding an operator of the leakage condition of the pipeline, facilitating the investigation and maintenance of the leaked pipeline and preventing the pipeline leakage from further deteriorating. When the calculated leak rate is smaller than the set leak rate threshold A2, no alarm is output, and the process returns to step S310 to continue the calculation. Herein, the alarm may refer to outputting a leak rate and/or emitting at least one of an acoustic and optical signal.
In example 2, the parallel processing was performed for each pipe, and the cyclic sequential processing was performed for each acoustic emission probe on each pipe.
Fig. 8 is a schematic structural diagram of an apparatus for extracting a valid signal from a pipeline leakage acoustic emission signal according to an embodiment of the present disclosure. As shown in fig. 8, the apparatus 800 for extracting a valid signal from a pipe leakage acoustic emission signal of this embodiment includes a pipe abnormality determination unit 810, a grouping unit 820, a leakage position analysis unit 830, a calculation unit 840, and a leakage rate determination unit 850.
The pipeline anomaly determination unit 810 is configured to determine whether the effective value voltage collected by each acoustic emission probe on each pipeline exceeds a set effective value voltage threshold. The operation of the pipe abnormality determining unit 810 may refer to the operation of step S120 described above with reference to fig. 1.
The grouping unit 820 is configured to obtain the effective value voltage collected by each acoustic emission probe on the pipeline where the at least one acoustic emission probe is located when the effective value voltage of the at least one acoustic emission probe exceeds the set effective value voltage threshold, and divide the effective value voltages collected by every three adjacent acoustic emission probes on the same pipeline into a group. The operation of the grouping unit 820 may refer to the operation of step S130 described above with reference to fig. 1.
The leakage position analyzing unit 830 is configured to determine whether the maximum effective value voltage in each group exceeds the set effective value voltage threshold, and when the maximum effective value voltage in each group exceeds the set effective value voltage threshold, determine whether an acoustic emission probe that collects the maximum effective value voltage in the corresponding group meets a preset rule. The preset rule can be that the acoustic emission probe which collects the maximum effective value voltage in the corresponding group is the acoustic emission probe in the group arranged in the middle according to the arrangement sequence on the pipeline, or the first acoustic emission probe or the last acoustic emission probe in all the acoustic emission probes arranged according to the arrangement sequence on the pipeline. The operation of the leak location analyzing unit 830 may refer to the operations of step S140 and step S150 described above with reference to fig. 1.
The calculating unit 840 is configured to calculate a leakage rate and a leakage position according to the maximum effective value voltage, the next largest effective value voltage, and a distance between the acoustic emission probe that acquires the maximum effective value voltage and the acoustic emission probe that acquires the next largest effective value voltage in the group, when the acoustic emission probe that acquires the maximum effective value voltage in the corresponding group satisfies the preset rule. The operation of the calculation unit 840 may refer to the operation of step S160 described above with reference to fig. 1.
The leakage rate determining unit 850 is configured to determine whether the calculated leakage rate is greater than a set leakage rate threshold, and when the calculated leakage rate is greater than the set leakage rate threshold, alarm and output a leakage position. The operation of the leak rate judging unit 850 may refer to the operations of step S170 and step S180 described above with reference to fig. 1.
The leakage rate determining unit 850 includes an alarm output module. And the alarm output module is used for alarming and outputting the leakage position when the calculated leakage rate is greater than the set leakage rate threshold value. The leak rate determining unit 850 may include a timing module. The timing module 851 is configured to determine whether a duration of the leakage rate greater than a set leakage rate threshold is greater than a set duration when the calculated leakage rate is greater than the set leakage rate threshold, and alarm and output a leakage position when the duration of the leakage rate greater than the set leakage rate threshold is greater than the set duration.
The means for extracting a valid signal from the pipe leak acoustic emission signal may further comprise a data vector generation unit. And the data vector generating unit is used for respectively forming data vectors by the effective value voltage collected by each acoustic emission probe, the serial number of the acoustic emission probe, the distance between the acoustic emission probe and the adjacent front acoustic emission probe and the distance between the acoustic emission probe and the adjacent rear acoustic emission probe before judging whether the effective value voltage collected by each acoustic emission probe on each pipeline exceeds the set effective value voltage threshold.
The method and the device for extracting the effective signal from the pipeline leakage acoustic emission signal greatly reduce the data calculation load, ensure the stability of the whole system and ensure the effectiveness and the correctness of the acoustic emission characteristic signal required by the calculation of the leakage rate and the leakage position.
It will be appreciated by those skilled in the art that the method and system of the present invention are not limited to the embodiments described in the detailed description, which is for the purpose of explanation and not limitation. Other embodiments will be apparent to those skilled in the art from the following detailed description, which are also included in the scope of the invention as defined in the appended claims.
Claims (8)
1. A method of extracting a valid signal from a pipe leak acoustic emission signal, comprising the steps of:
judging whether the effective value voltage collected by each acoustic emission probe on each pipeline exceeds a set effective value voltage threshold value or not;
when the effective value voltage of at least one acoustic emission probe exceeds the set effective value voltage threshold, acquiring the effective value voltage acquired by each acoustic emission probe on the pipeline where the at least one acoustic emission probe is positioned, and dividing the effective value voltage acquired by every three adjacent acoustic emission probes on the same pipeline into a group;
judging whether the maximum effective value voltage in each group exceeds the set effective value voltage threshold value, and when the maximum effective value voltage in each group exceeds the set effective value voltage threshold value, judging whether the acoustic emission probe which acquires the maximum effective value voltage in the corresponding group meets a preset rule, wherein the preset rule is that the acoustic emission probe which acquires the maximum effective value voltage in the corresponding group is the first acoustic emission probe or the last acoustic emission probe which is arranged in the middle of the group in the pipeline setting sequence or the first acoustic emission probe or the last acoustic emission probe which is arranged in the pipeline setting sequence in all the acoustic emission probes;
when the acoustic emission probe which acquires the maximum effective value voltage in the corresponding group meets the preset rule, calculating the leakage rate and the leakage position according to the maximum effective value voltage, the next largest effective value voltage in the group and the distance between the acoustic emission probe which acquires the maximum effective value voltage and the acoustic emission probe which acquires the next largest effective value voltage;
and judging whether the calculated leakage rate is greater than a set leakage rate threshold value or not, and alarming and outputting the leakage position when the calculated leakage rate is greater than the set leakage rate threshold value.
2. The method of extracting a valid signal from a pipeline leak acoustic emission signal as claimed in claim 1, wherein alarming and outputting the leak location when the calculated leak rate is greater than the set leak rate threshold comprises:
and when the calculated leakage rate is greater than the set leakage rate threshold value, judging whether the duration time of the leakage rate greater than the set leakage rate threshold value is greater than a set time length, and when the duration time is greater than the set time length, alarming and outputting the leakage position.
3. The method of extracting a utility signal from a pipe leak acoustic emission signal as set forth in claim 1, wherein prior to determining whether the utility voltage collected by each acoustic emission probe on each pipe exceeds a set utility voltage threshold, the method further comprises:
and respectively forming data vectors by the effective value voltage acquired by each acoustic emission probe, the serial number of the acoustic emission probe, the distance between the acoustic emission probe and the adjacent front acoustic emission probe and the distance between the acoustic emission probe and the adjacent rear acoustic emission probe.
4. A method of extracting a valid signal from a pipe leak acoustic emission signal as claimed in claim 1, wherein said alarm is outputting said leak rate and/or emitting at least one of an audible and a light alarm signal.
5. A method of extracting a valid signal from a pipe leak acoustic emission signal as claimed in claim 1 wherein said each pipe is processed cyclically in sequence or in parallel and said each acoustic emission probe on said each pipe is processed cyclically in sequence or in parallel.
6. An apparatus for extracting a desired signal from a pipe leak acoustic emission signal, comprising:
the pipeline abnormity determining unit is used for judging whether the effective value voltage collected by each acoustic emission probe on each pipeline exceeds a set effective value voltage threshold value;
the grouping unit is used for acquiring the effective value voltage acquired by each acoustic emission probe on the pipeline where the at least one acoustic emission probe is positioned when the effective value voltage of the at least one acoustic emission probe exceeds the set effective value voltage threshold, and dividing the effective value voltages acquired by every three adjacent acoustic emission probes on the same pipeline into a group;
the leakage position analysis unit is used for judging whether the maximum effective value voltage in each group exceeds the set effective value voltage threshold value or not, and judging whether the acoustic emission probes collecting the maximum effective value voltage in the corresponding group meet a preset rule or not when the maximum effective value voltage in each group exceeds the set effective value voltage threshold value, wherein the preset rule is that the acoustic emission probes collecting the maximum effective value voltage in the corresponding group are the acoustic emission probes arranged in the middle of the group in the arrangement sequence on the pipeline or the first acoustic emission probe or the last acoustic emission probe arranged in the arrangement sequence on the pipeline in all the acoustic emission probes;
the calculation unit is used for calculating the leakage rate and the leakage position according to the maximum effective value voltage, the next maximum effective value voltage and the distance between the acoustic emission probe for acquiring the maximum effective value voltage and the acoustic emission probe for acquiring the next maximum effective value voltage in the group when the acoustic emission probe for acquiring the maximum effective value voltage in the corresponding group meets the preset rule;
and the leakage rate judging unit is used for judging whether the calculated leakage rate is greater than a set leakage rate threshold value or not, and alarming and outputting the leakage position when the calculated leakage rate is greater than the set leakage rate threshold value.
7. The apparatus for extracting a desired signal from a pipe leak acoustic emission signal as set forth in claim 6, wherein said leak rate determining unit comprises:
and the timing module is used for judging whether the duration time of the leakage rate greater than the set leakage rate threshold value is greater than the set time length or not when the calculated leakage rate is greater than the set leakage rate threshold value, and alarming and outputting the leakage position when the duration time is greater than the set time length.
8. The apparatus for extracting a valid signal from a pipe leak acoustic emission signal as set forth in claim 6, further comprising:
and the data vector generating unit is used for respectively forming data vectors by the effective value voltage collected by each acoustic emission probe, the serial number of the acoustic emission probe, the distance between the acoustic emission probe and the adjacent front acoustic emission probe and the distance between the acoustic emission probe and the adjacent rear acoustic emission probe before judging whether the effective value voltage collected by each acoustic emission probe on each pipeline exceeds the set effective value voltage threshold.
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