CN102288679B - System for identifying fatigue damage state of 16Mn steel welding position - Google Patents
System for identifying fatigue damage state of 16Mn steel welding position Download PDFInfo
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Abstract
The invention discloses a system for identifying the fatigue damage state of a 16Mn steel welding position based on the strongest neighbor filter (SNF) strategy and direct stream digital (DSD) strategy. The system comprises multiple acoustic emission transducers, multiple paths of preamplifiers, an acoustic emission instrument and a fatigue damage nondestructive detection unit, wherein the fatigue damage nondestructive detection unit comprises an SNF filtering module, a sample extracting module, a nerve network predicting module and a DSD fatigue damage identifying module; and the SNF filtering module comprises an SNF energy filter processing module, an SNF amplitude filter processing module and an SNF waveform filter processing module. The state identification comprises the following steps of: performing multidimensional filtering on information acquired by the multiple paths of the acoustic emission transducers by adopting the SNF strategy, and training and predicting filtered signals by adopting an artificial neural network method to acquire fatigue damage parameters of the 16Mn steel welding position; and judging an nerve network output result by adopting the DSN strategy to determine the fatigue damage state of a tested piece. In the state of working, the system can pick up the fatigue damage parameters of the 16Mn steel welding position in service, identify different damage states, and pre-warn identified results.
Description
Technical field
The present invention relates to a kind of method that in-service 16Mn steel welding position failure state is during one's term of military service identified.More particularly, refer to a kind ofly based on SNF filtering strategies and DSD determination strategy, adopt acoustic emission and neural net method, the Fatigue Damage States of in-service 16Mn steel welding position in the heavy mechanical equipment of harbour is characterized and the system of qualitative assessment.
Background technology
Bank equipment in the heavy mechanical equipment of harbour: as ship loader, ship unloaders, grab claw, often use 16 manganese steel welding positions as crucial bearing member.Bank equipment in use for some time, as the faulted condition of 16 manganese steel welding positions to causing material impact the serviceable life of whole bank equipment.
16Mn steel (16 manganese steel) is a kind of low alloy steel that grows up in conjunction with the china natural resources situation, is widely used.The 16Mn steel force-bearing part after the regular hour, often some failure accidents can occur, and the damage of welding position is the main cause that causes its inefficacy under arms.Welding position in the 16Mn steel force-bearing part is because it is organized, the unevenness of performance and welding stress, and the existence of weld defects becomes the weak part that the most easily produces damage.And deformation damage is the main cause that causes its inefficacy, will make effective identification to its faulted condition for this reason, in time, correctly estimates the deformation degree of injury of 16Mn steel welding position, for its safe operation and life prediction provide foundation.
Welding position acoustic emission (Acoustic Emission Technique) because of have dynamically, the advantage such as detection in real time, be widely used in the damage check of structure and member.Practice shows, damage in various degree can occur when being subjected to load the different tissues material, and the sound emission signal characteristic that the difference of faulted condition is sent is also with difference.Such as the elastoplastic Damage that occurs in the initial stage that is subjected to Cyclic Load and latter stage etc.The parameters such as the acoustic emission waveform signal amplitude of these different faulted conditions, phase place, frequency all can respectively be had any different.Therefore can utilize acoustic emission as the instrument of monitoring 16Mn steel welding position Fatigue Damage States.
Neural network is an a kind of nonlinear system of the people's of simulation thinking.The BP Learning Algorithm can be described as: standardized training sample at first, initialization weights, threshold value, then input training sample, to its output state of each sample calculation, obtain its error, and adjust weights and the threshold value of each layer of network according to error back propagation, so repeatedly adjust until network error satisfies the condition that arranges.After sample training is completed, the incoming inspection sample, if network error is less than verify error at this moment, this network can be used for actual prediction.
Day by day to extensive, high-level efficiency development, the large-scale bank crane tool as the important Logistics Equipment in harbour has following characteristics along with modern industry:
(1) equipment is old, it is the sixties to the seventies of China's self design or from the Eastern Europe import that a lot of goliaths are arranged, minority is the second-hand equipment from state's imports such as U.S., days in addition, considers by 20～25 years designed lives, and a lot of equipment have also entered be on active service later stage or extended active duty stage;
(2) task is heavy, along with production-scale expansion, and the hysteresis of crane renewal, the work of many cranes is increasingly heavy, and the situation of overload also happens occasionally;
(3) present damage detecting method is immature, the part sampling Detection that the methods such as ultrasound examination and magnetic detection are carried out crane, and blindness is large, it is long to be prone to the cycle undetected and that detect, and workload is large, somewhat expensive;
(4) early warning evaluating system imperfection, the analysis and distinguishing technology of using at present can't be made early warning accurately and safety assessment to the damage of crane welding position.
Therefore, move reliably for guaranteeing crane safety, must detect the welding position, judge the faulted condition of welding position, thereby carry out safety assessment.
Summary of the invention
In order to reduce big machinery welding position personnel's injury, equipment loss and the economic loss that fatigue break causes that in use happen suddenly, the present invention proposes the fatigue damage parameter that a kind of neural net method based on SNF strategy and DSD strategy is predicted in-service 16Mn steel welding position, and the system that Fatigue Damage States is judged.At first this state recognition adopts the SNF strategy to carry out multi-C filtering to the information that the multi-Channel Acoustic transmitting transducer collects, and adopts Artificial Neural Network that filtered signal is trained and predicted, obtains the fatigue damage parameter of 16Mn steel welding position; Then adopt the DSD strategy that the neural network Output rusults is judged, determine the Fatigue Damage States of measured piece.This system in working order under, can pick up the fatigue damage parameter of in-service 16Mn steel welding position, different faulted conditions are identified, and the result that identifies are made early warning.
The present invention is a kind of 16Mn steel welding position Fatigue Damage States recognition system based on SNF strategy and DSD strategy, and this system includes a plurality of acoustic emission transducers (4), multichannel prime amplifier (3), an Acoustic radiating instrument (2) and a 16Mn steel fatigue damage Non-Destructive Testing unit, welding position (1);
16Mn steel fatigue damage Non-Destructive Testing unit (1) includes SNF filtering module (11), sampling module (12), neural network prediction module (13) and DSD fatigue damage identification module (14); SNF filtering module (11) includes SNF energy filter processing module (11A), SNF amplitude filtering processing module (11B) and SNF waveform filtering processing module (11C).
Acoustic emission transducer (4) and prime amplifier (3) are for supporting the use, the output terminal that is each acoustic emission transducer (4) is connected with the input end of a prime amplifier (3), the output terminal of each prime amplifier (3) is connected on the input information interface of Acoustic radiating instrument (2), and this input information interface is used for receiving multichannel demblee form amplification message f
SFatigue damage Non-Destructive Testing unit, 16Mn steel welding position (1) is embedded in the storer of Acoustic radiating instrument (2);
Acoustic emission transducer (4) is used for gathering the demblee form information S on in-service 16Mn steel welding position
n
Prime amplifier (3) is used for the demblee form information S to receiving
nBecome demblee form amplification message f after amplifying 40dB
S
Acoustic radiating instrument (2) is used for the demblee form amplification message f to receiving on the one hand
SBecome digital demblee form information f after the A/D conversion
S1=(e
S, A
S, C
S, D
S, V
S, K
S) export to Non-Destructive Testing unit, 16Mn steel welding position (1); On the other hand the fatigue damage identifying information D that receives being exported to display screen (2A) shows in real time;
The SNF filtering module (11) of Non-Destructive Testing unit, 16Mn steel welding position (1) adopts the digital demblee form information f of SNF strategy to receiving
S1=(e
S, A
S, C
S, D
S, V
S, K
S) carry out filtering, obtain acoustic emission fatigue damage information f
S2=(e, A, C, D, V, K).
The sampling modular model (12) of 16Mn steel welding construction deformation damage Non-Destructive Testing unit (1) is from acoustic emission deformation damage information f
S2Choose training sample I in=(e, A, C, D, V, K)
ID, s=[e
ID, tp, sA
ID, tp, sC
ID, tp, sD
ID, tp, sV
ID, tp, sK
ID, tp, s] and sample I ' to be diagnosed
ID, s=[e
ID, tq, sA
ID, tq, sC
ID, tq, sD
ID, tq, sV
ID, tq, sK
ID, tq, s], and it is inputed in neural network prediction module (13);
The neural network prediction module (13) of 16Mn steel welding construction deformation damage Non-Destructive Testing unit (1) is to I
ID, s=[e
ID, tp, sA
ID, tp, sC
ID, tp, sD
ID, tp, sV
ID, tp, sK
ID, tp, s] and I '
ID, s=[e
ID, tq, sA
ID, tq, sC
ID, tq, sD
ID, tq, sV
ID, tq, sK
ID, tq, s] train and obtain sample output layer information O to be diagnosed
ID, s=[dK
ID, tp, sA
ID,, tp, sV
ID, tp, sB
ID, tp, s];
The DSD deformation damage identification module (14) of 16Mn steel welding construction deformation damage Non-Destructive Testing unit (1) is to Q
ID, s=[dK
ID, tp, sA
ID, tp, sV
ID, tp, sB
ID, tp, s] carry out output welded structure deformation damage identifying information W=after analysis judgment (O '
ID, s, m (B
i)), this W=(O '
ID, s, m (B
i)) feed back to Acoustic radiating instrument (2) on the one hand, export on the other hand alarm unit (5) and show.
The present invention is a kind of according to acoustic emission information, adopts neural network that the fatigue damage parameter is predicted, identifying and diagnosing goes out the final faulted condition in 16Mn steel welding position, and the advantage of this recognition system is:
(A) adopt capture card in Acoustic radiating instrument to using acoustic emission information (the energy e of the acoustic emission transducer on 16Mn steel welding position after a while
S, measuring amplitude A
S, Ring-down count C
S, duration D
S, Ring-down count rate V
s, waveform kurtosis K
S) gather, and with the input information of this relevant information as the recognition system of acoustic emission neural network, make the present invention in the acoustic emission detection process, can be by Acoustic radiating instrument to the acoustic emission transducer information, analyze simultaneously the variation of acoustic emission information parameter and waveform, identifying is damage information, or noise information.
(B) fully utilize parameter information and the shape information of acoustic emission signal, increased reliability and the accuracy of diagnostic result, improved the adaptive faculty of diagnostic system.
(C) neural net method is the identifying and diagnosing system on basis, has certain fault-tolerant ability, can satisfy the requirement of steel construction complication system damage.
Description of drawings
Fig. 1 is based on the 16Mn steel welding position Fatigue Damage Assessment system chart of SNF strategy and DSD strategy.
Fig. 2 is fatigue damage Non-Destructive Testing unit, 16Mn steel of the present invention welding position block diagram.
Embodiment
The present invention is described in further detail below in conjunction with drawings and Examples.
Referring to Fig. 1, shown in Figure 2, nondestructive detection system for 16Mn steel welding position generally is comprised of a plurality of acoustic emission transducers 4 (also claiming sensor), multichannel prime amplifier 3, an Acoustic radiating instrument 2 and fatigue damage Non-Destructive Testing unit, a 16Mn steel welding position 1, wherein, 16Mn steel welding position fatigue damage Non-Destructive Testing unit 1 is made of SNF filtering module 11, sampling module 12, neural network prediction module 13 and DSD fatigue damage identification module 14.Include SNF energy filter processing module 11A, SNF amplitude filtering processing module 11B and SNF waveform filtering processing module 11C in SNF filtering module 11.Non-Destructive Testing unit 1 adopts Matlab language (version 7.0) exploitation.Acoustic emission transducer 4 and prime amplifier 3 are for supporting the use, the output terminal that is each acoustic emission transducer 4 is connected with the input end of a prime amplifier 3, the output terminal of each prime amplifier 3 is connected on the input information interface of Acoustic radiating instrument 2, and this input information interface is used for receiving multichannel demblee form amplification message f
SNon-Destructive Testing unit, 16Mn steel welding position 1 is embedded in the storer of Acoustic radiating instrument 2.In the present invention, Acoustic radiating instrument 2 is chosen the DiSP acoustic emission system that U.S. PAC company produces, acoustic emission transducer 4 is chosen CZ series or the WD series acoustic emission transducer that U.S. PAC company produces, and multichannel prime amplifier 3 is chosen the 2/4/6 type prime amplifier that U.S. PAC company produces.
Acoustic radiating instrument 2 is used for the demblee form amplification message f to receiving on the one hand
SBecome digital demblee form information f after the A/D conversion
S1=(e
s, A
s, C
s, D
s, V
s, K
s) export to Non-Destructive Testing unit, 16Mn steel welding position 1; On the other hand the fatigue damage identifying information D that receives being exported to display screen 2A shows in real time.Certainly have A/D converter in Acoustic radiating instrument 2.The present invention has only used energy e
S, measuring amplitude A
S, Ring-down count C
S, Ring-down count rate V
S, waveform kurtosis K
SWith duration D
SSix parameters.In the present invention, Acoustic radiating instrument is as welding position fatigue damage monitoring device.In the information that monitoring obtains, waveform kurtosis K
SWith Ring-down count rate V
SHas better correlativity with Crack Extension situation and stress state in the welding position fatigue damage, can better characterize fatigue damage information, use these parameters can fully utilize parameter information and the shape information of acoustic emission signal, increased reliability and the accuracy of diagnostic result.
In the present invention, utilize acoustic emission transducer 4 when carrying out information acquisition, not only damage information is gathered, also noise (neighbourhood noise, electromagnetic noise, mechanical friction noise) being gathered simultaneously (is e
s, A
s, C
s, D
s, V
s, K
sIn information be comprise noisy), therefore, in the present invention, adopted the SNF strategy to carry out denoising to gathering the information that obtains.The filtering module 11 of Non-Destructive Testing unit, 16Mn steel welding position 1 adopts the digital demblee form information f of SNF strategy to receiving
S1=(e
s, A
s, C
s, D
s, V
s, K
s) carry out filtering, obtain acoustic emission fatigue damage information f
S2=(e, A, C, D, V, K).
SNF (Signal Noise Filtering) strategy is that the original acoustic emission signal of acoustic emission transducer collection is carried out multi-C filtering, removes electromagnetic noise, and neighbourhood noise and other irrelevant signals obtain the serial of methods of fatigue damage signal.
The digital demblee form information f that receives
S1=(e
s, A
s, C
s, D
s, V
s, K
s), obtain the energy filter information f in SNF energy filter processing module 11A
SE=(e
s＞1, A
s, C
s, D
s, V
s, K
s), f
SEBe energy greater than 1 acoustic emission signal set; Obtain amplitude filtering information f in SNF amplitude filtering processing module 11B
SA=(e
s, A
s＞30dB, C
s, K
s, D
s), f
SABe that amplitude is greater than the acoustic emission signal set of 30dB; Obtain waveform filtering information f in SNF waveform filtering processing module 11C
SW∈ (100kHz, 400kHz), f
SWBe that waveform frequency is in the acoustic emission signal set of 100kHz to 400kHz.Obtain at last acoustic emission fatigue damage information f
S2=(e, A, C, D, V, K).
The sampling module 12 of Non-Destructive Testing unit, 16Mn steel welding position 1 is from acoustic emission fatigue damage information f
S2Choosing suitable sample set in=(e, A, C, D, V, K) trains and diagnose: concrete sampling step is:
The first step: in chronological sequence order is first with acoustic emission deformation damage information f
S2N sample in=(e, A, C, D, V, K) is numbered, and has first sample number to be designated as F
1=(e
1, A
1, C
1, D
1, V
1, K
1), second sample number is designated as F
2=(e
2, A
2, C
2, D
2, V
2, K
2), a people N sample number is designated as F by that analogy
N=(e
N, A
N, C
N, D
N, V
N, K
N).
Second step: set section gap
To described F
1=(e
1, A
1, C
1, D
1, V
1, K
1), F
2=(e
2, A
2, C
2, D
2, V
2, K
2) ..., F
N=(e
N, A
N, C
N, D
N, V
N, K
N) number and carry out segmentation, first paragraph [F is arranged
1, F
2, F
3... F
X], second segment [F
X+1, F
X+2, F
X+3... F
2X], and be extrapolated to final stage [F
N-X+1, F
N-X+2, F
N-X+3... F
N].
The 3rd step: (A) at first paragraph [F
1, F
2, F
3... F
X] in randomly draw body one by one with arbitrary sampling method;
(B) with interval X at second segment [F
X+1, F
X+2, F
X+3... F
2X] in extract body one by one;
(C) by that analogy, with interval X one section [F in the end
N-X+1, F
N-X+2, F
N-X+3... F
N] in extract body one by one;
In the present invention, the step of (A) in step 3, (B) go on foot with (C) step is that the individuality of extracting out in each section will be as the sampling sample.
In the present invention, obtain training sample I by the sampling step
ID, s=[e
ID, tp, sA
ID, tp, sC
ID, tp, sD
ID, tp, sV
ID, tp, sK
ID, tp, s]; Then obtain sample I ' to be diagnosed by above-mentioned methods of sampling sampling again after removing training sample
ID, s=[e
ID, tq, sA
ID, tq, sC
ID, tq, sD
ID, tq, sV
ID, tq, sK
ID, tq, s].
In order to obtain the injury tolerance sign model of in-service 16Mn steel welding position, the present invention has adopted the BP Learning Algorithm to carry out model training.Its training step is as follows:
Training step one is stored all acoustic emission fatigue damage information in acquisition time T that Acoustic radiating instrument 2 receives, and namely that storage is f
S2=(e, A, C, D, V, K) information, or be called primary data information (pdi);
Training step two, the acoustic emission fatigue damage information of choosing in the training sample set is carried out accumulated process, obtains training cumlative energy E
ID, tp, s, measuring amplitude A
ID, tp, s, training accumulation Ring-down count C
ID, tp, s, training cumulative duration D
ID, tp, sWaveform kurtosis K
ID, tp, sWith Ring-down count rate V
ID, tp, sThis E
ID, tp, s, A
ID, tp, s, C
ID, tp, s, D
ID, tp, s, V
ID, tp, sAnd K
ID, tp, sAs the training sample input layer information in the BP Learning Algorithm, it is I that this training sample input layer information adopts the set formal representation
ID, s=[E
ID, tp, sA
ID, tp, sC
ID, tp, sD
ID, tp, sV
ID, tp, sK
ID, tp, s];
Training step three, the training sample input layer information I that training step two is obtained
ID, sWith training sample hidden layer M
ID, s, training sample output layer information O
ID, sConstruct the injury tolerance sign model for in-service 16Mn steel welding position, this injury tolerance sign model tormulation form is D
g={ I
ID, s, M
ID, s, O
ID, s;
Training step four, the acoustic emission fatigue damage information of choosing in the diagnostic sample set is carried out accumulated process, obtains diagnosing cumlative energy E
ID, tq, s, diagnosis cumulative measurement amplitude A
ID, tq, s, diagnosis accumulation Ring-down count C
ID, tq, s, diagnosis cumulative duration D
ID, tq, s, waveform kurtosis K
ID, tq, sWith Ring-down count rate V
ID, tq, sThis E
ID, tq, s, A
ID, tq, s, C
ID, tq, s, D
ID, tq, s, V
ID, tq, sAnd K
ID, tq, sAs the sample input layer information to be diagnosed in the BP Learning Algorithm, it is I ' that this sample input layer information to be diagnosed adopts the set formal representation
ID, s=[E
ID, tq, sA
ID, tq, sC
ID, tq, sD
ID, tq, sV
ID, tq, sK
ID, tq, s];
Training step five, the sample input layer information I ' to be diagnosed that training step four is obtained
ID, sThe injury tolerance sign model D that substitution training step three obtains
gIn, use the BP Learning Algorithm and obtain sample output layer information O ' to be diagnosed
ID, s
In the present invention, the training sample input layer information I in training step two
ID, s=[E
ID, tp, sA
ID, tp, sC
ID, tp, sD
ID, tp, sV
ID, tp, sK
ID, tp, s] in each alphabetical physical significance be: E
ID, tp, sExpression training cumlative energy, A
ID, tp, sExpression training cumulative measurement amplitude, C
ID, tp, sExpression training accumulation Ring-down count, D
ID, tp, sExpression training cumulative duration, V
ID, tp, sExpression training sample Ring-down count rate, K
ID, tp, sExpression training sample waveform kurtosis, ID represents the code of acoustic emission transducer, and tp represents the access time of training sample, and s represents the type of acoustic emission transducer.
Training sample input layer information I
ID, sIn 6 elements be 6 nodes.
In the present invention, the training sample hidden layer M in training step three
ID, s=2 * 6+1=13, i.e. training sample hidden layer M
ID, sThe node number be I
ID, sThe node number two extraordinarily one.
In the present invention, the training sample output layer information O in training step three
ID, s=[dk
ID, tp, sA
ID, tp, sV
ID, tp, sB
ID, tp, s], comprise the parameter with the closest 4 torture tests of fatigue of materials degree of injury relation, K
ID, tp, sThe actual stress intensity factor width that records of expression training sample, A
ID, tp, sThe actual fatigue crack length that records of expression training sample, V
ID, tp, sThe actual fatigue crack growth rate that records of expression training sample, B
ID, tp, sIn the expression residing fatigue damage stage of training sample, be 4 nodes.
In the present invention, the sample input layer information I ' to be diagnosed in training step four
ID, s=[E
ID, tq, sA
ID, tq, sC
ID, tq, sD
ID, tq, sV
ID, tq, sK
ID, tq, s] in each alphabetical physical significance be: E
ID, tq, sExpression diagnosis cumlative energy, A
ID, tq, sExpression diagnosis cumulative measurement amplitude, C
ID, tq, sExpression diagnosis accumulation Ring-down count, D
ID, tq, sThe expression accumulation even number duration, V
ID, tq, sExpression training sample Ring-down count rate K
ID, tq, sExpression expression diagnostic sample waveform kurtosis, ID represents the code of acoustic emission transducer, and tq is illustrated in the access time of sample to be diagnosed, and s represents the type of acoustic emission transducer.
In the present invention, the sample output layer information O ' to be diagnosed in training step five
ID, s=[dK '
ID, tp, sA '
ID, tp, sV′
ID, tp, sB′
ID, tp, s], wherein: dK '
ID, tp, sThe sample stress intensity factor width to be diagnosed that the expression match obtains, A '
ID, tp, sThe sample fatigue crack length to be diagnosed that the expression match obtains, V '
ID, tp, sThe sample fatigue crack growth rate to be diagnosed that the expression match obtains., B '
ID, tp, sThe expression residing fatigue damage stage of training sample.
The sample output layer information O ' to be diagnosed that DSD faulted condition judge module (14) obtains neural network prediction module (13)
ID, sIn the fatigue damage characteristic parameter that comprises adopt the DSD strategy to judge, obtain identifying and diagnosing m (B as a result
i).The recognition methods of DSD strategy is as follows:
As O '
ID, s=[dK '
ID, tp, sA′
ID, tp, sV′
ID, tp, sB′
ID, tp, s] in
And A '
ID, tp, s＜5.5mm and V '
ID, tp, s＜5 * 10
-4During mm/cycle (cycle), namely the welding position is in fatigue crack initiation state m (B
1);
As O '
ID, s=[dK '
ID, tp, sA′
ID, tp, sV′
ID, tp, sB′
ID, tp, s] in
And 5.5mm＜A '
ID, tp, s＜11mm and 5 * 10
-4Mm/cycle＜V '
ID, tp, s＜5 * 10
-3During mm/cycle (cycle), namely the welding position is in fatigue crack and stablizes extended mode m (B
2);
As O '
ID, s=[dK '
ID, tp, sA′
ID, tp, sV′
ID, tp, sB′
ID, tp, s] in
And A '
ID, tp, s＞11mm and V '
ID, tp, s＞5 * 10
-3During mm/cycle (cycle), namely the welding position is in fatigue crack unstable propagation state m (B
3).
In the present invention, the welding position is in fatigue crack initiation state m (B
1), the welding position is in fatigue crack and stablizes extended mode m (B
1) and the welding position be in fatigue crack unstable propagation state m (B
3) be called identifying and diagnosing m (B as a result
i), identifying and diagnosing is m (B as a result
i) and diagnostic sample output layer information O '
ID, sJointly as welded structure fatigue damage identifying information W=(O '
ID, s, m (B
i)) output to alarm unit 5 and display screen 2A.
Embodiment 1:Welding position to 40t (ton) locomotive crane carries out acoustic emission detection.
The welding position cantilever is degree of stretching effectively: 5000mm, detect length 3000mm.
Welding position 16Mn composition of steel used is as shown in table 1.
The 16Mn composition of steel that table 1 welding position is used
| Composition | C | Mn | Si | P | S | Ca |
| Mass percentage content (%) | 0.16 | 1.42 | 0.31 | 0.022 | 0.033 | 0.10 |
[0067]Detection has with equipment: (A) two narrow frequency acoustic emission transducers of R15 (CZ series of PAC company, response frequency is 100kHz～400kHz, centre frequency 150kHz) (the WD series of PAC company, response frequency are 20kHz～1MHz) for and two wideband transducers.
(B) 2/4/6 type prime amplifier of four PAC companies.
(C) Acoustic radiating instrument is U.S. PAC company full digital 16 passage DiSP acoustic emission systems.Threshold value 40dB when Acoustic radiating instrument detects, acoustic emission peak value definition time PDT is 300 μ s, and it is 600 μ s that limiting time HDT is clashed in acoustic emission, and it is 1000 μ s that blocking time HLT is clashed in acoustic emission.
In the injury tolerance sign model of 16Mn steel, the diagnostic result of part acoustic emission neural network is as shown in table 2.
Table 2 part 16Mn steel welding position fatigue damage identifying information
| E′ ID，tq，s | A′ ID，tq，s | C′ ID，tq，s | K′ ID，tq，s | V′ ID，tq，s | D′ ID，tq，s | A′ ID，tp，s | V′ ID，tp，s | dK′ ID，tp，s | m(B i) |
| 1228 | 6513 | 21015 | 3.6 | 22 | 62563 | 5.7633 | 0.001261 | 36.28 | m(B 2) |
| 1235 | 6832 | 22010 | 3.6 | 25 | 61644 | 5.9213 | 0.001823 | 36.58 | m(B 2) |
| 1248 | 7216 | 24035 | 3.7 | 34 | 63352 | 6.0881 | 0.002109 | 37.31 | m(B 2) |
| 1251 | 7408 | 24103 | 3.35 | 27 | 78586 | 6.7325 | 0.002712 | 37.23 | m(B 2) |
| 1266 | 7512 | 25606 | 4.01 | 41 | 82231 | 8.2733 | 0.003128 | 39.12 | m(B 2) |
| 1288 | 8233 | 27731 | 6.46 | 26 | 84258 | 8.5879 | 0.003301 | 39.42 | m(B 2) |
Diagnostic result shows that this weld assembly is in fatigue crack and stablizes extended mode, therefore has certain danger, and corresponding fatigue state data is arranged as a reference, and the detection of its recognition result and actual components is substantially identical.This shows, the present invention can be to the faulted condition m (B in 16Mn steel welding position During Fatigue Damage Process
i) identify and diagnose.
The present invention adopts SNF strategy and DSD strategy, based on acoustic emission neural network and data fusion model, 16Mn steel fatigue damage parameter is predicted, set up 16Mn steel Fatigue Damage States identifying and diagnosing system: at first adopt the SNF strategy to carry out multi-C filtering to the information that the multi-Channel Acoustic transmitting transducer collects, and adopt Artificial Neural Network that filtered signal is trained and predicted, obtain the fatigue damage parameter of 16Mn steel welding position; Then adopt the DSD strategy that the neural network Output rusults is judged, determine the Fatigue Damage States of measured piece.Utilize this model, can identify, diagnose the faulted condition in 16Mn steel welding position fatigue process, and then provide foundation to its reliability service.
Claims (3)
1. 16Mn steel welding position Fatigue Damage States recognition system based on SNF strategy and DSD strategy, this system includes a plurality of acoustic emission transducers (4), multichannel prime amplifier (3), an Acoustic radiating instrument (2), it is characterized in that: also include a 16Mn steel fatigue damage Non-Destructive Testing unit, welding position (1); Fatigue damage Non-Destructive Testing unit, 16Mn steel welding position (1) is embedded in the storer of Acoustic radiating instrument (2);
Fatigue damage Non-Destructive Testing unit, 16Mn steel welding position (1) includes SNF filtering module (11), sampling module (12), neural network prediction module (13) and DSD fatigue damage identification module (14); SNF filtering module (11) includes SNF energy filter processing module (11A), SNF amplitude filtering processing module (11B) and SNF waveform filtering processing module (11C);
Acoustic emission transducer (4) and prime amplifier (3) are for supporting the use, the output terminal that is each acoustic emission transducer (4) is connected with the input end of a prime amplifier (3), the output terminal of each prime amplifier (3) is connected on the input information interface of Acoustic radiating instrument (2), and this input information interface is used for receiving multichannel demblee form amplification message f
S
Acoustic emission transducer (4) is used for gathering the demblee form information S on in-service 16Mn steel welding position
n
Prime amplifier (3) is used for the demblee form information S to receiving
nBecome demblee form amplification message f after amplifying 40dB
S
Acoustic radiating instrument (2) is used for the demblee form amplification message f to receiving on the one hand
SBecome digital demblee form information f after the A/D conversion
S1=(e
S, A
S, C
S, D
S, V
S, K
S) export to 16Mn steel fatigue damage Non-Destructive Testing unit, welding position (1); On the other hand the fatigue damage identifying information D that receives being exported to display screen (2A) shows in real time;
Described digital demblee form information f
S1=(e
S, A
S, C
S, D
S, V
S, K
S) middle e
SExpression energy, A
SExpression measuring amplitude, C
SExpression Ring-down count, V
SExpression Ring-down count rate, K
SExpression waveform kurtosis, D
SThe expression duration;
The SNF filtering module (11) of fatigue damage Non-Destructive Testing unit, 16Mn steel welding position (1) adopts the digital demblee form information f of SNF strategy to receiving
S1=(e
S, A
S, C
S, D
S, V
S, K
S) carry out filtering, obtain acoustic emission fatigue damage information f
S2=(e, A, C, D, V, K);
The sampling module (12) of fatigue damage Non-Destructive Testing unit, 16Mn steel welding position (1) is from acoustic emission fatigue damage information f
S2Choose training sample input layer information I in=(e, A, C, D, V, K)
ID, s=[e
ID, tp, sA
ID, tp, sC
ID, tp, sD
ID, tp, sV
ID, tp, sK
ID, tp, s] and sample input layer information I ' to be diagnosed
ID, s=[e '
ID, tq, sA′
ID, tq, sC′
ID, tq, sD′
ID, tq, sV′
ID, tq, sK′
ID, tq, s], and it is inputed in neural network prediction module (13);
Described training sample input layer information I
ID, s=[e
ID, tp, sA
ID, tp, sC
ID, tp, sD
ID, tp, sV
ID, tp, sK
ID, tp, s] middle e
ID, tp, sExpression training cumlative energy, A
ID, tp, sExpression measuring amplitude, C
ID, tp, sExpression training accumulation Ring-down count, D
ID, tp, sExpression training cumulative duration, K
ID, tp, sExpression waveform kurtosis, V
ID, tp, sExpression Ring-down count rate, ID represent the code of acoustic emission transducer, the access time that tp represents training sample, the type that s represents acoustic emission transducer;
Sample input layer information I ' described to be diagnosed
ID, s=[e '
ID, tq, sA′
ID, tq, sC′
ID, tq, sD′
ID, tq, sV′
ID, tq, sK′
ID, tq, s] middle e '
ID, tq, sExpression diagnosis cumlative energy, A '
ID, tq, sExpression diagnosis cumulative measurement amplitude, C '
ID, tq, sExpression diagnosis accumulation Ring-down count, D '
ID, tq, sExpression diagnosis cumulative duration, K '
ID, tq, sExpression waveform kurtosis, V '
ID, tq, sExpression Ring-down count rate, ID represent the code of acoustic emission transducer, the access time that tq represents sample to be diagnosed, the type that s represents acoustic emission transducer;
The neural network prediction module (13) of fatigue damage Non-Destructive Testing unit, 16Mn steel welding position (1) is to I
ID, s=[e
ID, tp, sA
ID, tp, sC
ID, tp, sD
ID, tp, sV
ID, tp, sK
ID, tp, s] and ID
ID, s=[D '
ID, tq, sA′
ID, tq, sC′
ID, tq, sD′
ID, tq, sV′
ID, tq, sK′
ID, tq, s] train and obtain training sample output layer information O
ID, s=[dK
ID, tp, sdA
ID, tp, sdV
ID, tp, sB
ID, tp, s];
Described training sample output layer information O
ID, s=[dK
ID, tp, sdA
ID, tp, sdV
ID, tp, sB
ID, tp, s] middle dK
ID, tp, sThe actual stress intensity factor width that records of expression training sample, dA
ID, tp, sThe actual fatigue crack length that records of expression training sample, dV
ID, tp, sThe actual fatigue crack growth rate that records of expression training sample, B
ID, tp, sThe expression residing fatigue damage stage of training sample;
The DSD fatigue damage identification module (14) of fatigue damage Non-Destructive Testing unit, 16Mn steel welding position (1) is to O
ID, s=[dK
ID, tp, sdA
ID, tp, sdV
ID, tp, sB
ID, tp, s] carry out output welded structure fatigue damage identifying information W=after analysis judgment (O '
ID, s, m (B
i)), O '
ID, sRepresent sample output layer information to be diagnosed, m (B
i) expression identifying and diagnosing result, this W=(O '
ID, s, m (B
i)) feed back to Acoustic radiating instrument (2) on the one hand, export on the other hand alarm unit (5) and show;
As sample output layer information O ' to be diagnosed
ID, s=[dK '
ID, tp, sDA '
ID, tp, sDV '
ID, tp, sB′
ID, tp, s] in
And dA '
ID, tp, s＜5.5mm and dV '
ID, tp, s＜5 * 10
-4During mm/cycle, namely the welding position is in fatigue crack initiation state m (B
1); DK '
ID, tp, sThe sample stress intensity factor width to be diagnosed that the expression match obtains, dA '
ID, tp, sThe sample fatigue crack length to be diagnosed that the expression match obtains, dV '
ID, tp, sThe sample fatigue crack growth rate to be diagnosed that the expression match obtains, B '
ID, tp, sThe expression residing fatigue damage stage of training sample;
As sample output layer information O ' to be diagnosed
ID, s=[dK '
ID, tp, sDA '
ID, tp, sDV '
ID, tp, sB′
ID, tp, s] in
And 5.5mm＜dA '
ID, tp, s＜11mm and 5 * 10
-4Mm/cycle＜dV '
ID, tp, s＜5 * 10
-3During mm/cycle, namely the welding position is in fatigue crack and stablizes extended mode m (B
2);
As sample output layer information O ' to be diagnosed
ID, s=[dK '
ID, tp, sDA '
ID, tp, sDV '
ID, tp, sB′
ID, tp, s] in
And dA '
ID, tp, s＞11mm and dV '
ID, tp, s＞5 * 10
-3During mm/cycle, namely the welding position is in fatigue crack unstable propagation state m (B
3);
The welding position is in fatigue crack initiation state m (B
1), the welding position is in fatigue crack and stablizes extended mode m (B
2) and the welding position be in fatigue crack unstable propagation state m (B
3) be called identifying and diagnosing m (B as a result
i), identifying and diagnosing is m (B as a result
i) and sample output layer information O ' to be diagnosed
ID, sJointly as welded structure fatigue damage identifying information W=(O '
ID, s, m (B
i)) output to alarm unit (5) and display screen (2A).
2. the 16Mn steel welding position Fatigue Damage States recognition system based on SNF strategy and DSD strategy according to claim 1, it is characterized in that: the sampling module (12) of 16Mn steel fatigue damage Non-Destructive Testing unit, welding position (1), from acoustic emission fatigue damage information f
S2Choosing suitable sample set in=(e, A, C, D, V, K) trains and diagnose: concrete sampling step is:
The first step: in chronological sequence order is first with acoustic emission fatigue damage information f
S2N sample in=(e, A, C, D, V, K) is numbered, and has first sample number to be designated as F
1=(e
1, A
1, C
1, D
1, V
1, K
1), second sample number is designated as F
2=(e
2, A
2, C
2, D
2, V
2, K
2), N sample number is designated as F by that analogy
N=(e
N, A
N, C
N, D
N, V
N, K
N);
Second step: set section gap X, wherein
To described F
1=(e
1, A
1, C
1, D
1, V
1, K
1), F
2=(e
2, A
2, C
2, D
2, V
2, K
2) ..., F
N=(e
N, A
N, C
N, D
N, V
N, K
N) number and carry out segmentation, first paragraph [F is arranged
1, F
2, F
3... F
X], second segment [F
X+1, F
X+2, F
X+3... F
2X], and be extrapolated to final stage [F
N-X+1, F
N-X+2, F
N-X+3... F
N];
The 3rd step: (A) at first paragraph [F
1, F
2, F
3... F
X] in randomly draw body one by one with arbitrary sampling method;
(B) with interval X at second segment [F
X+1, F
X+2, F
X+3... F
2X] in extract body one by one;
(C) by that analogy, with interval X one section [F in the end
N-X+1, F
N-X+2, F
N-X+3... F
N] in extract body one by one;
Obtain training sample input layer information I by the sampling step
ID, s=[e
ID, tp, sA
ID, tp, sC
ID, tp, sD
ID, tp, sV
ID, tp, sK
ID, tp, s]; Then obtain sample input layer information I ' to be diagnosed by above-mentioned methods of sampling sampling again after removing training sample input layer information
ID, s=[e '
ID, tq, sA′
ID, tq, sC′
ID, tq, sD′
ID, tq, sV′
ID, tq, sK′
ID, tq, s].
3. the 16Mn steel welding position Fatigue Damage States recognition system based on SNF strategy and DSD strategy according to claim 1, it is characterized in that: in order to obtain the injury tolerance sign model of in-service 16Mn steel welding position, neural network prediction module (13) has adopted the BP Learning Algorithm to carry out model training; Its training step is as follows:
Training step one is stored all acoustic emission fatigue damage information in acquisition time T that Acoustic radiating instrument (2) receives, and namely that storage is f
S2=(e, A, C, D, V, K) information, or be called primary data information (pdi);
Training step two, the acoustic emission fatigue damage information of choosing in the training sample set is carried out accumulated process, obtains training cumlative energy e
ID, tp, s, measuring amplitude A
ID, tp, s, training accumulation Ring-down count C
ID, tp, s, training cumulative duration D
ID, tp, s, waveform kurtosis K
ID, tp, sWith Ring-down count rate V
ID, tp, sThis e
ID, tp, s, A
ID, tp, s, C
ID, tp, s, D
ID, tp, s, V
ID, tp, sAnd K
ID, tp, sAs the training sample input layer information in the BP Learning Algorithm, it is I that this training sample input layer information adopts the set formal representation
ID, s=[e
ID, tp, sA
ID, tp, sC
ID, tp, sD
ID, tp, sV
ID, tp, sK
ID, tp, s]; Training sample input layer information I
ID, sIn 6 elements be 6 nodes;
Training step three, the training sample input layer information I that training step two is obtained
ID, s=[e
ID, tp, sA
ID, tp, sC
ID, tp, sD
ID, tp, sV
ID, tp, sK
ID, tp, s] and training sample hidden layer M
ID, s, training sample output layer information O
ID, s=[dK
ID, tp, sdA
ID, tp, sdV
ID, tp, sB
ID, tp, s] constructing the injury tolerance sign model for in-service 16Mn steel welding position, this injury tolerance sign model tormulation form is D
g={ I
ID, s, M
ID, s, O
ID, s;
Training sample hidden layer M in training step three
ID, s=2 * 6+1=13, i.e. training sample hidden layer M
ID, sThe node number be I
ID, sThe node number two extraordinarily one;
Training sample output layer information O in training step three
ID, s=[dK
ID, tp, sdA
ID, tp, sdV
ID, tp, sBI
D, tp, s], comprise the parameter with the closest 4 torture tests of fatigue of materials degree of injury relation, dK
ID, tp, sThe actual stress intensity factor width that records of expression training sample, dA
ID, tp, sThe actual fatigue crack length that records of expression training sample, dVI
D, tp, sThe actual fatigue crack growth rate that records of expression training sample, B
ID, tp, sIn the expression residing fatigue damage stage of training sample, be 4 nodes;
Training step four, the acoustic emission fatigue damage information of choosing in sample set to be diagnosed is carried out accumulated process, obtains diagnosing cumlative energy e '
ID, tq, s, diagnosis cumulative measurement amplitude A '
ID, tq, s, diagnosis accumulation Ring-down count C '
ID, tq, s, diagnosis cumulative duration D '
ID, tq, s, waveform kurtosis K '
ID, tq, sWith Ring-down count rate V '
ID, tq, sThis e '
ID, tq, s, A '
ID, tq, s, C '
ID, tq, s, D '
ID, tq, s, V '
ID, tq, sAnd K '
ID, tq, sAs the sample input layer information to be diagnosed in the BP Learning Algorithm, it is I ' that this sample input layer information to be diagnosed adopts the set formal representation
ID, s=[e '
ID, tq, sA′
ID, tq, sC′
ID, tq, sD′
ID, tq, sV′
ID, tq, sK′
ID, tq, s];
Training step five, the sample input layer information I ' to be diagnosed that training step four is obtained
ID, s=[e '
ID, tq, sA′
ID, tq, sC′
ID, tq, sD′
ID, tq, sV′
ID, tq, sK′
ID, tq, s] the injury tolerance sign model D that obtains of substitution training step three
g={ I
ID, s, M
ID, s, O
ID, sIn, use the BP Learning Algorithm and obtain sample output layer information O ' to be diagnosed
ID, s=[dK '
ID, tp, sDA '
ID, tp, sDV '
ID, tp, sB′
ID, tp, s].
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