CN103995055A - Screening method for eliminating noise interfered data of acoustic emission testing on large-size storage tank - Google Patents
Screening method for eliminating noise interfered data of acoustic emission testing on large-size storage tank Download PDFInfo
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- CN103995055A CN103995055A CN201410220308.7A CN201410220308A CN103995055A CN 103995055 A CN103995055 A CN 103995055A CN 201410220308 A CN201410220308 A CN 201410220308A CN 103995055 A CN103995055 A CN 103995055A
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Abstract
The invention discloses a screening method for eliminating noise interfered data of acoustic emission testing on a large-size storage tank. The screening method comprises the following steps: distributing a protection sensor above a main detection sensor at the lower part of the wall of the storage tank; and carrying out position distinguishing on an acoustic emission signal source by the protection sensor and the main detection sensor according to a sequence of triggering the same acoustic emission signal so as to shield noise signals from a non-tank-bottom region. According to the screening method, the protection sensor is arranged and a certain data screening method is utilized to carry out data filtering on interference signals from the space above a bottom plate of the storage tank, so that the frequency of impacting in an acoustic emission testing process can be reduced effectively, a corrosion signal from the bottom plate of the storage tank can be accurately received by the main detection sensor, accurate data on corrosion of the bottom plate of the storage tank can be obtained, and the accuracy of an acoustic emission testing evaluation result of the large-size storage tank is improved.
Description
Technical field
The invention belongs to sound field of non destructive testing, be specifically related to the data analysis that transmits, especially relate to a kind of large-scale storage tank acoustic emission detection noise data screening method.
Background technology
In recent years, adopting acoustic emission to carry out online evaluation to storage tank bottom corrosion situation is widely applied.This be a kind ofly can carry out the online non-intrusion type detecting, not stop production, unclear tank, economic and practical bottom corrosion condition evaluation technology.
Online main reception storage tank bottom corrosion signal and other signals relevant to corrosion of detecting of acoustic emission bottom corrosion, as oxide, hyrate, bubble etc. (these signals are also that the activity due to corrosion product produces, and the intensity of its signal can characterize the strong process that corrosion occurs indirectly).These signals have formed the data basis of large-scale storage tank acoustic emission detection assessment.But, at large-scale storage tank, carry out in the testing process of acoustic emission, can receive the invalid signals that comes from the outside in a large number and disturb, greatly affected assessment result.This wherein just comprises that electromagnetic noise disturbs, mechanicalness noise disturbs and the interference of tank body (tank deck drippage signal) itself.Electromagnetic noise interference is mainly from checkout equipment self and liquid level gauge etc., and the electromagnetic signal of checkout equipment can be eliminated by methods such as power grounds.In general mechanicalness noise disturbs, and all likely in testing process, impacts with the direct-connected physical construction of tank body, and as pipeline, floating plate, coil pipe etc., the variation of wind-force also can produce mechanicalness noise.Different physical construction can produce different impacts in operational process, and still, mechanicalness noise can, in testing process, be observed artificially and be eliminated by testing staff.
Also have a kind of undesired signal to come from the signal of storage tank shell top and the generation of tank deck plate, for vault storage tank, boiling characteristics due to tank internal memory oil storage product, make tank interior upper end have a large amount of gas phase zone, gas phase zone is at certain temperature and concentration conditions, to be attached to tank top and constantly condense, set point constantly increases, and again drops onto on floating plate or directly drop onto in oil product medium under the effect of gravity; For internal floating roof and outer floating roof, although there is not residual titration noise, because floating plate directly contacts with oil product, so floating plate is easy to corrode, thereby produce, corrode acoustic emission signal; And the tank skin of storage tank also can produce a certain amount of acoustic emission signal, these signals come from that stress that oil corrosion, tank skin produce is concentrated and extraneous dust storm to tank skin " knocking " etc.The calibrate AE sensor that this noise-like signal can be placed in tank skin bottom equally receives, these signal energies that come from tank skin and tank deck are higher, final data analysis has been produced to very large impact, not only increased the quantity of clashing into for assessment of the acoustic emission signal of result, final acoustic emission result grading is produced to error, and these signals also can be used to the location of acoustic emission source, cause positioning result to occur error.Such acoustic emission signal cannot, by artificial cognition and filtering, up to the present also comparatively effectively not screen out method.
Summary of the invention
The object of the present invention is to provide a kind of large-scale storage tank acoustic emission detection noise data screening method, the method is used for identifying effective source signal in large-scale storage tank acoustic emission detection process, screen out external interference signal, thereby improve the accuracy of acoustic emission detection assessment.
The technology used in the present invention solution is:
A large-scale storage tank acoustic emission detection noise data screening method, comprises the following steps:
(1) above being positioned at the main detecting sensor of storage tank shell bottom, corresponding layout escorted sensor;
(2) determine and to escort the sequencing that sensor and main detecting sensor are triggered for same acoustic emission signal, if first this signal is escorted sensor and is received, can confirm as the voice signal from territory, non-tank base area, and carry out filtering, the time span of filtering is t, wherein: t=D/V;
---t, the maximum duration that signal is propagated in storage tank, s
---D, tank diameter, m;
---V, the propagation rate of sound in oil product, m/s
If first this signal is received by main detecting sensor, can confirm as the voice signal from territory, tank base area, and retain, the time span of reservation is also t, the like, complete the noise filtering of whole group of data.
Preferably, on described storage tank shell, escorting sensor equates with the number of main detecting sensor.
Useful technique effect of the present invention is:
The present invention escorts sensor by layout, and use certain data screening method, to carry out data filtering from the undesired signal of storage tank bottom plate top, effectively reduce the shock number in acoustic emission detection process, thereby make winner's detecting sensor can receive more accurately the corrosion signal from Tank base plate, to obtain Tank base plate corrosion data more accurately, improve the accuracy of large-scale storage tank acoustic emission detection assessment result.
Accompanying drawing explanation
Fig. 1 illustrates the installation site schematic diagram that escorts sensor in the present invention.
Embodiment
The present invention proposes a kind of large-scale storage tank acoustic emission detection noise data screening method, escorts sensor carry out data filtering by employing, has greatly promoted the accuracy of tank bottom corrosion condition assessment result.Below in conjunction with accompanying drawing, be elaborated.
A large-scale storage tank acoustic emission detection noise data screening method, concrete steps are as follows:
(1) above being positioned at the main detecting sensor of storage tank shell bottom, corresponding layout escorted sensor, as shown in Figure 1, escorts sensor and equates with the layout number of main detecting sensor.
(2) determine and to escort the sequencing that sensor and main detecting sensor are triggered for same acoustic emission signal, if first this signal is escorted sensor and is received, can confirm as the voice signal from territory, non-tank base area, and carry out filtering, the time span of filtering is t, wherein: t=D/V;
---t, the maximum duration that signal is propagated in storage tank, s
---D, tank diameter, m;
---V, the propagation rate of sound in oil product, m/s
If first this signal is received by main detecting sensor, can confirm as the voice signal from territory, tank base area, and retain, the time span of reservation is also t, the like, complete the noise filtering of whole group of data.
Above-mentioned large-scale storage tank acoustic emission detection noise data screening method is based on following principle:
(1) if acoustic emission signal from tank top, according to the sequencing of sound transmission, certainly be that first the sensor that escorts that is arranged in collar receives signal, the master reference that is then only bottom receives, and can determine that thus this signal is the top from tank bottom.
The maximum duration of propagating in tank inside of (2) acoustic emission signals, can calculate by formula t=D/V; T, the maximum duration that signal is propagated in storage tank, s; D, tank diameter, m; V, the propagation rate of sound in oil product, m/s.
(3) travel-time of acoustic emission signal in oil product is Millisecond, is far longer than two time intervals between acoustic emission signal.Therefore, for one group of acoustic emission detection data-signal, if first a signal is escorted sensor, receive, so just can confirm as the voice signal from top at the bottom of tank, carry out filtering, the time span of filtering is t.The like, complete the noise filtering of whole group of data.
In order more clearly to describe the present invention, below by detailed case study on implementation, describe.
5000m with a storage gasoline
3internal floating roof tank is example, tank diameter D=21m, and the propagation rate V=1250m/s of sound in gasoline medium, therefore, the maximum propagation time of sound in storage tank is t=0.018s.One group of acoustic emission detection signal data below, the shock number of storage tank in the time period, in Table 1:
Wherein 1～6 passage is main detecting sensor, and 7～12 passages are for escorting sensor.
Sequence number 1 is that first clashes into, and its passage receiving is the 11st passage, belongs to and escorts sensor, and therefore, the shock number by the 0.018s after 575.2881s between at this moment in the time period is all deleted, and is the 1st to the 12nd shock; First the 13rd shock be that 6 passages are received, belongs to effective shock, and therefore, the shock number by the 0.018s after 576.4155s between at this moment in the time period all retains, and retains the 13rd to the 24th shock for effectively clashing into.By that analogy, complete effective acoustic emission and clash into data screening.
As can be seen from Table 1,35 clash into number finally by data screening altogether, and remaining shock number is reduced to 12, and employing is escorted the shock number producing after sensor and obviously reduced.This also illustrates that in the signal collecting, some signal produces from territory, non-tank base area, and it is also many that the shock quantity of its generation is even clashed into number than the acoustic emission producing at the bottom of tank.Therefore, employing is escorted sensor and is carried out data filtering, has greatly promoted the accuracy of tank bottom corrosion condition assessment result.
Table 1
| Sequence number | Time | Passage | Rise time | Counting | Delete/retain |
| 1 | 575.2881 | 11 | 2723 | 64 | Delete |
| 2 | 575.2883 | 5 | 2102 | 18 | Delete |
| 3 | 575.2887 | 10 | 1879 | 98 | Delete |
| 4 | 575.2892 | 4 | 1728 | 63 | Delete |
| 5 | 575.2917 | 12 | 804 | 1495 | Delete |
| 6 | 575.2917 | 6 | 1074 | 1495 | Delete |
| 7 | 575.2945 | 9 | 2397 | 1041 | Delete |
| 8 | 575.2946 | 3 | 11094 | 302 | Delete |
| 9 | 575.2957 | 7 | 3059 | 1441 | Delete |
| 10 | 575.2959 | 1 | 2033 | 1342 | Delete |
| 11 | 575.2966 | 8 | 8852 | 1243 | Delete |
| 12 | 575.2969 | 2 | 4521 | 1565 | Delete |
| 13 | 576.4155 | 6 | 47632 | 1873 | Retain |
| 14 | 576.4166 | 12 | 37027 | 1769 | Retain |
| 15 | 576.4178 | 5 | 2760 | 2061 | Retain |
| 16 | 576.4181 | 11 | 2102 | 587 | Retain |
| 17 | 576.4182 | 1 | 2261 | 1799 | Retain |
| 18 | 576.4195 | 7 | 1233 | 1602 | Retain |
| 19 | 576.4232 | 4 | 9721 | 1720 | Retain |
| 20 | 576.4233 | 10 | 2041 | 523 | Retain |
| 21 | 576.424 | 2 | 3227 | 1728 | Retain |
| 22 | 576.4243 | 8 | 1871 | 2009 | Retain |
| 23 | 576.4252 | 3 | 10582 | 1408 | Retain |
| 24 | 576.4254 | 9 | 9907 | 460 | Retain |
| 25 | 581.2631 | 11 | 2679 | 30 | Delete |
| 26 | 581.264 | 5 | 1333 | 18 | Delete |
| 27 | 581.2648 | 7 | 1115 | 35 | Delete |
| 28 | 581.2649 | 1 | 1988 | 31 | Delete |
| 29 | 581.2684 | 10 | 2335 | 24 | Delete |
| 30 | 581.2693 | 8 | 3211 | 31 | Delete |
| 31 | 581.2696 | 2 | 2289 | 23 | Delete |
| 32 | 581.2699 | 4 | 583 | 16 | Delete |
| 33 | 581.2747 | 9 | 4528 | 51 | Delete |
| 34 | 581.2759 | 3 | 371 | 14 | Delete |
| 35 | 581.2771 | 1 | 237 | 11 | Delete |
Claims (2)
1. a large-scale storage tank acoustic emission detection noise data screening method, is characterized in that comprising the following steps:
(1) above being positioned at the main detecting sensor of storage tank shell bottom, corresponding layout escorted sensor;
(2) determine and to escort the sequencing that sensor and main detecting sensor are triggered for same acoustic emission signal, if first this signal is escorted sensor and is received, can confirm as the voice signal from territory, non-tank base area, and carry out filtering, the time span of filtering is t, wherein: t=D/V;
---t, the maximum duration that signal is propagated in storage tank, s
---D, tank diameter, m;
---V, the propagation rate of sound in oil product, m/s
If first this signal is received by main detecting sensor, can confirm as the voice signal from territory, tank base area, and retain, the time span of reservation is also t, the like, complete the noise filtering of whole group of data.
2. a kind of large-scale storage tank acoustic emission detection noise data screening method according to claim 1, is characterized in that: on described storage tank shell, escort sensor and equate with the number of main detecting sensor.
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Cited By (6)
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| CN103808808A (en) * | 2012-10-18 | 2014-05-21 | 奥林巴斯Ndt公司 | An ultrasonic testing instrument with dithery pulsing |
| CN106855494A (en) * | 2015-12-08 | 2017-06-16 | 中国石油化工股份有限公司 | A kind of storage tank bottom plate acoustic emission detection system |
| CN107917962A (en) * | 2017-10-31 | 2018-04-17 | 中国石油天然气股份有限公司 | The definite method and apparatus of the corrosion rate of tank bottom |
| CN110095336A (en) * | 2019-06-04 | 2019-08-06 | 青岛科技大学 | A kind of online sound emission of tank bottom stress corrosion-electrochemistry Collaborative experiment device |
| CN110702796A (en) * | 2019-10-17 | 2020-01-17 | 常州大学 | Simulation device for acquiring in-service pipeline corrosion acoustic emission signal and acquisition method thereof |
| CN111077224A (en) * | 2019-10-17 | 2020-04-28 | 常州大学 | In-service pipeline corrosion acoustic emission signal generator |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103808808A (en) * | 2012-10-18 | 2014-05-21 | 奥林巴斯Ndt公司 | An ultrasonic testing instrument with dithery pulsing |
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| CN110095336A (en) * | 2019-06-04 | 2019-08-06 | 青岛科技大学 | A kind of online sound emission of tank bottom stress corrosion-electrochemistry Collaborative experiment device |
| CN110702796A (en) * | 2019-10-17 | 2020-01-17 | 常州大学 | Simulation device for acquiring in-service pipeline corrosion acoustic emission signal and acquisition method thereof |
| CN111077224A (en) * | 2019-10-17 | 2020-04-28 | 常州大学 | In-service pipeline corrosion acoustic emission signal generator |
| CN111077224B (en) * | 2019-10-17 | 2024-02-09 | 常州大学 | Acoustic emission signal generator for corrosion of in-service pipeline |
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Application publication date: 20140820 |