CN106932469A - A kind of heat-exchange tube defect inspection method based on eddy current signal feature - Google Patents
A kind of heat-exchange tube defect inspection method based on eddy current signal feature Download PDFInfo
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Abstract
The invention belongs to technical field of nondestructive testing, and in particular to a kind of heat-exchange tube defect inspection method based on eddy current signal feature.Comprise the following steps：Signature analysis is carried out according to all kinds of eddy current signals, feature database is formed；Above-mentioned signal characteristic is combined to form defect recognition rule；Heat-transfer pipe vortex detection data is read in, eddy current signal normalization and signal scaling is carried out；Structure is positioned；According to upper step structure positioning result, whole heat-transfer pipe is divided into different structural regions and free space；According to the rules unit that each class defect recognition rule includes, its characteristic range is measured and matched to signal, all the match is successful for the strictly all rules unit included when certain class defect recognition rule, then find certain class defect；Historical data compares analysis；Automatical analysis flow：Repeat step three arrives step 7, until completing whole steam generator heat-transfer pipe defects detection work.The present invention is meeting EDDY CURRENT demand while greatling save human cost and detection time.
Description
Technical field
The invention belongs to technical field of nondestructive testing, and in particular to a kind of heat exchange based on eddy current signal feature
Defective tube detection method.
Background technology
Steam generator heat-transfer pipe is the critical component of one loop of nuclear power station pressure boundary integrality, while it is again
Most weak link in whole loop, it is the lossless inspection of vortex to carry out detection most effective way to heat-transfer pipe at present
Survey.Whole eddy detection system is generally made up of multiple subsystems, can be divided into signal system, positioning scanning
System and accessory system three parts.Wherein signal system mainly includes eddy current signal acquisition system, vortex
The associated components such as signal analysis software, eddy-current instrument, probe are constituted.During EDDY CURRENT, signal acquisition
It is the prerequisite of whole process, signal acquisition Integrated Simulation positioner control subsystem, eddy-current instrument control
Molding block, push away and pull out the software systems such as device control software, by controlling these subsystems, coordinate locator, push away
Device ordered movement is pulled out, the collection of eddy current signal is realized.After the completion of collection, signal is sentenced by analysis software
Wound is analyzed and generates examining report, so as to realize the detection to steam generator heat-transfer pipe.In whole vortex inspection
In examining system, signal analysis is the core of whole detecting system, is also that whole analysis system is most difficult to and most time-consuming
Link, external Non-Destructive Testing company develops eddy current signal automatic analysis system, replaces partial analysis people
Member it is successful, fact proved using eddy current signal auto Analysis can be greatly reduced analysis personnel,
Saving human cost, shortening detection duration, some automatically analyze module realizing method difference for current foreign countries, examine
Surveying effect respectively has advantage and disadvantage.
The content of the invention
It is an object of the invention to provide a kind of heat-exchange tube defect inspection method based on eddy current signal feature,
Situ eddy current detection demand is being met while greatling save human cost and detection time.
To reach above-mentioned purpose, the technical solution used in the present invention is：
A kind of heat-exchange tube defect inspection method based on eddy current signal feature, comprises the following steps：
Step one：According to all kinds of eddy current signals, signature analysis is carried out, form feature database；
The signal characteristic include voltage, phase, length, signal 8-shaped feature, signal intensity trend,
Signal intensity speed；
Step 2：Above-mentioned signal characteristic is combined to form defect recognition rule：
Extract each class defect --- including through hole, internal injury, cut, abrasion, spot corrosion all signal characteristics,
Using the digital scope of all signal characteristics an as decision rule；Same class defect is according to different distributions region
--- including flow distribution plate, each supporting construction, shockproof strip, bend pipe and free space, eddy current signal feature is different,
The different decision rule of generation, rules unit is defined as by each signal characteristic, and the combination of rules unit is
Rule；Flow distribution plate, each supporting construction, shockproof strip, the defect of pipe bent position, letter is extracted from vortex mixing passage
Number feature, free space --- the white space defect of pipe then extract signal characteristic from being vortexed non-mixing passage；
Step 3：A heat-transfer pipe vortex detection data is read in, eddy current signal normalization and signal scaling is carried out,
Determine calibration curve；
Step 4：Structure is positioned, including it is pipe end, flow distribution plate, each supporting construction, shockproof strip, curved
Pipeline section, extracts the signal characteristic of each structure, is matched with signal characteristic in feature database, determines structure position
Put and length；
Step 5：According to upper step structure positioning result, by whole heat-transfer pipe be divided into different structural regions and
Free space, different zones are analyzed using the rule that step 2 is generated, for structural region and free zone
The junctional area in domain, is processed using transitional region, and the length of transitional region is set to 5-30mm；
Step 6：According to the subregion of step 5, each region is scanned, extracts certain length window
Signal, according to the rules unit that each class defect recognition rule includes, measures, and match it to signal
Characteristic range, all the match is successful for the strictly all rules unit included when certain class defect recognition rule, then find certain
Class defect；
Step 7：Historical data compares analysis：When it is determined that having found defect and historical record defect uniformity,
Current heat-transfer pipe analysis report is read in first；Second step, sets certain amount of redundancy, is signal characteristic
5%-20%, comparing content includes：Defective locations, measurement voltage, phase；3rd step, carries out report contrast,
Comparing content includes defective locations, measurement voltage, phase, determines current defect type, including newly-increased defect,
It was found that defect and same defect, comparative result recorded in reporting；
Step 8：Automatical analysis flow：Repeat step three arrives step 7, until completing whole steam generation
Device heat-transfer pipe defects detection works.
Described signal 8-shaped feature, four regions are divided into according to the probe coil direction of motion by signal：Point
Duan Yi：Bobbin coils 1 are segmented two close to defect：Bobbin coils 1 leave defect, segmentation three：Bobbin
Coil 2 is segmented four close to defect：Bobbin coils 2 leave defect；A front lower drop edge of correspondence is wherein segmented,
Two, three corresponding rising edges of segmentation, trailing edge after the correspondence of segmentation four；Characteristic index includes：8-shaped front and rear angles：
Data point before and after 8-shaped on trailing edge is with respect to two angles of end points line；Amplitude before and after 8-shaped：8 words
The distance of data point before and after shape on trailing edge to neighbouring end points；8-shaped front and back position：Decline before and after 8-shaped
Position along upper data point relative to end points line.
Having the beneficial effect that acquired by the present invention：
The present invention is by analyzing feature and summarizing defect recognition rule, it is possible to increase analysis personnel's analysis level；
Analysis result is objective, have ignored the influence of human factor；Analyze speed is faster；At present according to the method from
Defect detecting system has been applied to Some Domestic EDDY CURRENT scene, including Fuqing nuclear power plant, Fan family mountain core
Power plant etc..
Brief description of the drawings
Fig. 1 is various features signal schematic representation；
Fig. 2 is the 8-shaped digital representation schematic diagram of flaw indication；
Fig. 3 is flaw indication variable angle feature schematic diagram；
Fig. 4 is that architecture signals position schematic diagram；
Fig. 5 is that analystal section divides schematic diagram；
Fig. 6 is defect recognition rule schematic diagram；
Fig. 7 is automatical analysis schematic flow sheet；
Fig. 8 is the signal schematic representation that free territory finds；
Fig. 9 is the measurement result schematic diagram of the corresponding rule of defect.
Specific embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
According to EDDY CURRENT principle, probe produces vortex in tube wall, when probe movement, tube wall shape, lacks
Fall into, size or electromagnetic property change cause coil impedance to change, eddy-current instrument is by detecting this change
Form vortex data signal, it is heat-transfer pipe pipe end, flow distribution plate, each supporting construction, shockproof strip, bend loss, logical
Hole, internal injury, cut, abrasion, spot corrosion etc. can all cause electromagnetic field to change so as to cause vortex of different shapes
Signal, as shown in Figure 1.
Heat-exchange tube defect inspection method based on eddy current signal feature of the present invention comprises the following steps：
Step one：According to all kinds of eddy current signals, signature analysis is carried out, form feature database；
The signal characteristic include voltage, phase, length, signal 8-shaped feature, signal intensity trend,
Signal intensity speed amount etc.；
The signal 8-shaped feature, four regions, reference are divided into according to the probe coil direction of motion by signal
Fig. 2:
Segmentation one：Bobbin coils 1 are segmented two close to defect：Bobbin coils 1 leave defect, segmentation three：
Bobbin coils 2 are segmented four close to defect：Bobbin coils 2 leave defect；Wherein before the correspondence of segmentation 1
Trailing edge, is segmented 2,3 corresponding rising edges, trailing edge after the correspondence of segmentation 4；Main characteristic index includes：8
Font front and rear angles：Data point before and after 8-shaped on trailing edge is with respect to two angles of end points line, such as Fig. 3
The angle of middle AD and AB；Amplitude before and after 8-shaped：Data point before and after 8-shaped on trailing edge is to approach end
The distance of point, the length of AD in such as Fig. 3；8-shaped front and back position：Data before and after 8-shaped on trailing edge
Relative to the position of end points line, C points are in the lower section of AB to point such as in figure.8-shaped front and rear angles can be used
Direction (clockwise or counterclockwise) characterize, in such as Fig. 3ArriveAngle be it is clockwise,ArriveAngle is
Clockwise.
Step 2：Above-mentioned signal characteristic is combined to form defect recognition rule：
All signal characteristics of each class defect (through hole, internal injury, cut, abrasion, spot corrosion) are extracted, will
The digital scope of all signal characteristics is used as a decision rule；Same class defect (is divided according to different distributions region
Stream plate, each supporting construction, shockproof strip, bend pipe and free space), eddy current signal feature is different, and generation is different
Decision rule, each signal characteristic is defined as rules unit, the combination of rules unit is rule；
Flow distribution plate, each supporting construction, shockproof strip, the defect of pipe bent position, signal characteristic is extracted from vortex mixing passage,
Free space (referring to the white space of pipe) defect then extracts signal characteristic, reference from the non-mixing passage of vortex
Fig. 6, using each rules unit of list display, includes 4 recognition units in figure.
Step 3：A heat-transfer pipe vortex detection data is read in, eddy current signal normalization and signal scaling is carried out,
Determine calibration curve；
Step 4：Structure is positioned, reference picture 4, including it is pipe end, flow distribution plate, each supporting construction, anti-
Shake bar, bend loss etc., extract the signal characteristic of each structure, are matched with signal characteristic in feature database,
Determine locations of structures and length；
Step 5：According to upper step structure positioning result, by whole heat-transfer pipe be divided into different structural regions and
Free space, reference picture 5, different zones are analyzed using the rule that step 2 is generated, for structural region
With the junctional area of free space, processed using transitional region, during analysis, cover certain length, generally set
It is set to 5-30mm；
Step 6：According to the subregion of step 5, each region is scanned, extracts certain length window
Signal, according to the rules unit that each class defect recognition rule includes, measures, and match it to signal
Characteristic range, all the match is successful for the strictly all rules unit included when certain class defect recognition rule, then find certain
Class defect；
Step 7：Historical data compares analysis：When it is determined that having found defect and historical record defect uniformity,
Current heat-transfer pipe analysis report is read in first；Second step, sets certain amount of redundancy, usually signal characteristic
5%-20%, comparing content includes：Defective locations, measurement voltage, phase；3rd step, carries out report right
Than comparing content includes defective locations, measurement voltage, phase, determines current defect type, including newly-increased
Defect, defect and same defect are not found, during comparative result recorded into report；
Step 8：Automatical analysis flow：Repeat step three arrives step 7, until completing whole steam generation
Device heat-transfer pipe defects detection works, main flow reference picture 7.
For example, reference picture 6.The recognition rule of free interval traumatic defects defined in figure.Automatically analyze
Flow it is as follows：1. setting and the initialization process of signal are completed；2. pair current heat-transfer pipe data carry out structure
Positioning and analyzed area are divided, and determine free interval field；3. the recognition rule of free interval wound is set,
Reference picture 6, altogether four rule：Rule one：VPP is measured, it is desirable to depth 10% -100%；Rule two：
VPP is measured, it is desirable to 30 degree -155 degree of phase；Rule three：VPP is measured, it is desirable to amplitude 0.5V -50V；
Rule four：VSL is measured, it is desirable to measurement result 0.055-50.Only four rules all meet, then it is assumed that hair
Defect is showed, the signal that reference picture 8 finds, its measurement result reference picture 9 meets 4 rules.
Claims (2)
1. a kind of heat-exchange tube defect inspection method based on eddy current signal feature, it is characterised in that：Including such as
Lower step：
Step one：According to all kinds of eddy current signals, signature analysis is carried out, form feature database；
The signal characteristic include voltage, phase, length, signal 8-shaped feature, signal intensity trend,
Signal intensity speed；
Step 2：Above-mentioned signal characteristic is combined to form defect recognition rule：
Extract each class defect --- including through hole, internal injury, cut, abrasion, spot corrosion all signal characteristics,
Using the digital scope of all signal characteristics an as decision rule；Same class defect is according to different distributions region
--- including flow distribution plate, each supporting construction, shockproof strip, bend pipe and free space, eddy current signal feature is different,
The different decision rule of generation, rules unit is defined as by each signal characteristic, and the combination of rules unit is
Rule；Flow distribution plate, each supporting construction, shockproof strip, the defect of pipe bent position, letter is extracted from vortex mixing passage
Number feature, free space --- the white space defect of pipe then extract signal characteristic from being vortexed non-mixing passage；
Step 3：A heat-transfer pipe vortex detection data is read in, eddy current signal normalization and signal scaling is carried out,
Determine calibration curve；
Step 4：Structure is positioned, including it is pipe end, flow distribution plate, each supporting construction, shockproof strip, curved
Pipeline section, extracts the signal characteristic of each structure, is matched with signal characteristic in feature database, determines structure position
Put and length；
Step 5：According to upper step structure positioning result, by whole heat-transfer pipe be divided into different structural regions and
Free space, different zones are analyzed using the rule that step 2 is generated, for structural region and free zone
The junctional area in domain, is processed using transitional region, and the length of transitional region is set to 5-30mm；
Step 6：According to the subregion of step 5, each region is scanned, extracts certain length window
Signal, according to the rules unit that each class defect recognition rule includes, measures, and match it to signal
Characteristic range, all the match is successful for the strictly all rules unit included when certain class defect recognition rule, then find certain
Class defect；
Step 7：Historical data compares analysis：When it is determined that having found defect and historical record defect uniformity,
Current heat-transfer pipe analysis report is read in first；Second step, sets certain amount of redundancy, is signal characteristic
5%-20%, comparing content includes：Defective locations, measurement voltage, phase；3rd step, carries out report contrast,
Comparing content includes defective locations, measurement voltage, phase, determines current defect type, including newly-increased defect,
It was found that defect and same defect, comparative result recorded in reporting；
Step 8：Automatical analysis flow：Repeat step three arrives step 7, until completing whole steam generation
Device heat-transfer pipe defects detection works.
2. the heat-exchange tube defect inspection method based on eddy current signal feature according to claim 1, its
It is characterised by：Described signal 8-shaped feature, four areas are divided into according to the probe coil direction of motion by signal
Domain：Segmentation one：Bobbin coils 1 are segmented two close to defect：Bobbin coils 1 leave defect, segmentation
Three：Bobbin coils 2 are segmented four close to defect：Bobbin coils 2 leave defect；Wherein it is segmented a pair
Should preceding trailing edge, two, three corresponding rising edges of segmentation, trailing edge after the correspondence of segmentation four；Characteristic index includes：8
Font front and rear angles：Data point before and after 8-shaped on trailing edge is with respect to two angles of end points line；8-shaped
Front and rear amplitude：The distance of data point before and after 8-shaped on trailing edge to neighbouring end points；8-shaped front and back position：
Position of the data point relative to end points line before and after 8-shaped on trailing edge.
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Cited By (4)
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| CN107633134A (en) * | 2017-09-19 | 2018-01-26 | 中国核动力研究设计院 | A kind of vibrationproof bar reverses the analysis method to steam generator heat-transfer pipe effect of attrition |
| CN109975396A (en) * | 2017-12-27 | 2019-07-05 | 核动力运行研究所 | A kind of heat-transfer pipe vortex detection differential path signal symmetry measurement method |
| CN109975395A (en) * | 2017-12-27 | 2019-07-05 | 核动力运行研究所 | A kind of eddy current testing signal pattern imaging method |
| CN111896614A (en) * | 2020-08-08 | 2020-11-06 | 宝银特种钢管有限公司 | Quality analysis and judgment method for bent section of U-shaped heat transfer pipe for nuclear steam generator |
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