CN107917957A - A kind of damage detecting method of slab structure - Google Patents
A kind of damage detecting method of slab structure Download PDFInfo
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- CN107917957A CN107917957A CN201711056773.1A CN201711056773A CN107917957A CN 107917957 A CN107917957 A CN 107917957A CN 201711056773 A CN201711056773 A CN 201711056773A CN 107917957 A CN107917957 A CN 107917957A
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G—PHYSICS
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Abstract
The present invention relates to a kind of damage detecting method of slab structure, this method comprises the following steps：S1：Piezoelectric transducer array is arranged in slab structure；S2：Establish benchmark database；S3：Gather the current demand signal and Current Temperatures of slab structure to be measured；S4：Calculate difference signal, in difference signal=benchmark database with current baseline signal current demand signal；S5：Damage index is calculated according to difference signal and with current baseline signal, if damage index exceeds predetermined threshold value, judges that slab structure to be measured is damaged, if damage index judges that slab structure to be measured is not damaged without departing from predetermined threshold value.The damage detecting method is by the way of temperature-compensating, during by PZT (piezoelectric transducer) to the damage check of slab structure, weaken due to temperature change it is larger caused by influence, improve accuracy of detection, avoid that there are security risk.
Description
Technical field
The present invention relates to structure detection technical field, and in particular to a kind of damage check side of rail vehicle slab structure
Method.
Background technology
At present, the one kind of piezoelectric intelligent detection technique as structural health detection technique, can carry out region detection, be easy to
With structure fusion, it is widely used in composite material and Metal Structure Damage detection.In the prior art, PZT (piezoelectric transducer) pair is passed through
In the method that structural damage is detected, since detection environment is more in interior, environmental condition is stablized relatively, therefore does not account for
Influence to temperature to testing result, but the change of temperature can cause structure the phenomenon expanded with heat and contract with cold occur, and influence knot to be detected
The propagation of ripple in structure, and then influence the precision of structural damage detection.
And for such as Motor train unit body key position carry out damage check when, due to ambient temperature change or
In running order transformer temperature during such as train operation and the transformer temperature difference under halted state are larger, position
Also raised accordingly in the temperature of surrounding key structure, if damage check is carried out to these key structures at this time, using pressure
Electric transducer detects but without considering the factor of temperature, its accuracy of detection is impacted, and there are larger security risk.
The content of the invention
The object of the present invention is to provide a kind of damage detecting method of slab structure, by the way of temperature-compensating, logical
During PZT (piezoelectric transducer) is crossed to the damage check of slab structure, weaken due to the larger caused influence of temperature change, improve
Accuracy of detection, avoids that there are security risk.
In order to solve the above technical problems, the present invention provides a kind of damage detecting method of slab structure, this method is included such as
Lower step：
S1：Piezoelectric transducer array is arranged in slab structure；
S2：Establish benchmark database：
(1) PZT (piezoelectric transducer) excites undamaged slab structure with specific incentives frequency, to produce Lamb wave；
(2) multigroup background signal and corresponding temperature are gathered, each background signal is the first of the Lamb wave
A characteristic value for reaching ripple；
(3) background signal described in each group and corresponding temperature are stored in the benchmark database；
S3：The current demand signal and Current Temperatures of slab structure to be measured are gathered in the method identical with (1), (2) in S2；
S4：Difference signal is calculated, the difference signal=current baseline signal-current demand signal, the current baseline signal is institute
State background signal corresponding with the Current Temperatures in benchmark database；
S5：Damage index is calculated according to difference signal and with the current baseline signal, if the damage index is beyond default
Threshold value, then judge that the slab structure to be measured is damaged, if the damage index judges institute without departing from the predetermined threshold value
Slab structure to be measured is stated not damage.
The detection scheme of the present invention is using PZT (piezoelectric transducer) as driver, is believed voltage drive using its inverse piezoelectric effect
Number it is changed into the stress Lamb wave (Lamb wave) propagated in slab structure, Lamb wave travels to the PZT (piezoelectric transducer) as sensor
Near, mechanical oscillation signal is changed into voltage signal output using its piezoelectric effect.Due to voltage excitation signals be it is certain,
By the voltage signal under comparative analysis voltage signal to be measured and slab structure good working condition, i.e., the plate is judged using base-line method
Whether shape structure is damaged.Wherein, slab structure is not limited to slab construction, it is possibility to have corresponding curved-surface structure, its
Size on thickness direction is less than the size in the size and width on its length direction so that PZT (piezoelectric transducer) is with spy
After determining driving frequency excitation, Lamb wave rather than R wave can be produced.
Piezoelectric transducer array is arranged in slab structure, can be according to the concrete condition of slab structure to PZT (piezoelectric transducer)
Array is designed, its particular number is not limited, and therefore, for the larger slab structure of volume, increases piezoelectric energy-conversion
The quantity of device, suitable for the damage check of the slab structure in big region.
Benchmark database is established, slab structure is under good working condition, that is, not damaged state, gathers multigroup slab structure
Background signal and temperature, and the background signal collected and temperature are stored in benchmark database as judging structural damage
Benchmark.Wherein, the collection for background signal includes：(1) PZT (piezoelectric transducer) excites undamaged plate shape with specific incentives frequency
Structure, to produce Lamb wave；(2) multigroup background signal and corresponding temperature are gathered, each background signal is the of Lamb wave
The characteristic value of one arrival ripple；(3) each group background signal collected and corresponding temperature are stored in benchmark database
It is interior.At this time, there are certain correspondence with temperature for the base-line data in benchmark database.
Slab structure is in during use, may be damaged inside it, and during detection, which is board under test shape
Structure.To the slab structure collection current demand signal s_c and Current Temperatures t to be measured, wherein, in the collection and S2 of current demand signal
Collection to background signal is identical：(1) PZT (piezoelectric transducer) excites slab structure to be measured with specific incentives frequency, to produce blue nurse
Ripple；(2) current demand signal and Current Temperatures are gathered, wherein, current demand signal is the characteristic value of first arrival ripple of Lamb wave.
According to background signal in baseline database and the correspondence of temperature, determine to believe with current basic line with reference to Current Temperatures
Number s_b, calculates difference signal s_s, s_s=s_b-s_c.
Damage index DI is finally calculated according to difference signal s_s and current baseline signal s_b, if damage index DI exceeds
Predetermined threshold value, then judge that the slab structure to be measured is damaged, if damage index DI judges that this is treated without departing from predetermined threshold value
Slab structure is surveyed not damage.Wherein, predetermined threshold value is carried out according to the installation site of the slab structure and intensity requirement etc.
Setting, be not specifically limited herein, when damage index exceedes the predetermined threshold value, illustrate needs the slab structure is studied for a second time courses one has flunked or
Replace, to avoid danger, and when damage index is without departing from the predetermined threshold value, which does not have defect or the defect smaller
In controlled range, danger is had no, can be continuing with.
That is, the present invention calculates base during difference signal in the damage process using base-line method detection slab structure
Line signal is to consider temperature-compensating when calculating difference signal with Current Temperatures corresponding background signal in benchmark database,
Effectively weaken and change since temperature change is larger for influence of the PZT (piezoelectric transducer) to damage check, even environment temperature
Become, the accuracy of testing result will not be influenced, improve damage check precision, avoid that there are security risk.
Alternatively, the energy of the energy of the damage index=difference signal/and the current baseline signal, wherein, signal
Energy calculated according to equation below：
Wherein te、tsThe beginning and ending time in the section of first arrival ripple of respectively described Lamb wave, s (t) is the piezoelectricity
The voltage signal that transducer detects.
Alternatively, in S2, if the energy of the background signal meets particular Gaussian distribution occasion, the base is included
In quasi- database, if the energy of the background signal does not meet the particular Gaussian distribution occasion, the Lamb wave is detected
The beginning and ending time in section of first arrival ripple or the arrangement of piezoelectric transducer array in S1.
Alternatively, in S5, if the damage index, without departing from the predetermined threshold value, and the energy of the current demand signal meets
The particular Gaussian distribution occasion of the energy of background signal in the benchmark database, then by the current demand signal and the current temperature
Degree is included in the benchmark database.
Alternatively, the particular Gaussian distribution occasion is in the frequency range of Gaussian Profile 5%~95%.
Alternatively, during gathering the background signal and the collection current demand signal, signal is filtered and
Reconstruct.
Alternatively, it is filtered using band logical mode.
Alternatively, the beginning and ending time in the section of first arrival ripple of the signal of reconstruct is determined using wavelet transformation.
Alternatively, the current baseline signal, is to use in benchmark database described in least square fitting each first
Reach the characteristic value of ripple and the relation of temperature, and the background signal determined with reference to the Current Temperatures in S3.
Brief description of the drawings
Fig. 1 is the dispersion curve figure of aluminum alloy plate materials；
Fig. 2 is the FB(flow block) of the damage detecting method of the slab structure of the embodiment of the present invention.
Embodiment
It is below in conjunction with the accompanying drawings and specific real in order to make those skilled in the art more fully understand technical scheme
Applying example, the present invention is described in further detail.
An embodiment of the present invention provides a kind of damage detecting method of slab structure, this method comprises the following steps：
S1：Piezoelectric transducer array is arranged in slab structure；
S2：Establish benchmark database：
(1) PZT (piezoelectric transducer) excites undamaged slab structure with specific incentives frequency, to produce Lamb wave；
(2) multigroup background signal and corresponding temperature are gathered, each background signal is first arrival ripple of Lamb wave
Characteristic value；
(3) each group background signal and corresponding temperature are stored in benchmark database；
S3：The current demand signal and Current Temperatures of slab structure to be measured are gathered in the method identical with (1), (2) in S2；
S4：Difference signal=current baseline signal-current demand signal is calculated, database is interior with working as on the basis of the current baseline signal
The corresponding background signal of preceding temperature；
S5：Damage index is calculated according to difference signal and with current baseline signal, if damage index exceeds predetermined threshold value, is sentenced
Slab structure to be measured of breaking is damaged, if damage index judges that slab structure to be measured is not damaged without departing from predetermined threshold value.
The detection scheme of the embodiment of the present invention is using PZT (piezoelectric transducer) as driver, using its inverse piezoelectric effect by voltage
Pumping signal is changed into the stress Lamb wave (Lamb wave) propagated in slab structure, and Lamb wave travels to the piezoelectricity as sensor
Near transducer, mechanical oscillation signal is changed into voltage signal output using its piezoelectric effect.Since voltage excitation signals are
It is certain, by the voltage signal under comparative analysis voltage signal to be measured and slab structure good working condition, i.e., using base-line method come
Judge whether the slab structure is damaged.Wherein, slab structure is not limited to slab construction, it is possibility to have corresponding curved surface knot
Structure, its size in a thickness direction are less than the size in the size and width on its length direction so that piezoelectricity changes
After energy device is excited with specific incentives frequency, Lamb wave rather than R wave can be produced.
Above-mentioned specific incentives frequency need to be determined according to the Dispersion of structure, and by taking aluminium alloy slab structure as an example, Fig. 1 is aluminium
The dispersion curve of sheet alloy, transverse axis are the thick product (fd) of frequency, and the longitudinal axis is group velocity, between group velocity, that is, PZT (piezoelectric transducer) away from
From divided by first arrival ripple arrival time, driving frequency (such as 250kHz) is chosen in the chosen area usually in figure, this
Obtained first of sample reaches ripple and only includes S0 patterns or A0 patterns, and signal is relatively easy, is easy to extract and analyzes, while can
Avoid mixing boundary echo.
Piezoelectric transducer array is arranged in slab structure, can be according to the concrete condition of slab structure to PZT (piezoelectric transducer)
Array is designed, its particular number is not limited, and therefore, for the larger slab structure of volume, increases piezoelectric energy-conversion
The quantity of device, suitable for the damage check of the slab structure in big region.
Benchmark database is established, slab structure is under good working condition, that is, not damaged state, gathers multigroup slab structure
Background signal and temperature, and the background signal collected and temperature are stored in benchmark database as judging structural damage
Benchmark, correspondence therebetween is determined according to background signal and temperature.Wherein, the collection for background signal includes：(1)
PZT (piezoelectric transducer) excites undamaged slab structure with specific incentives frequency, to produce Lamb wave；(2) multigroup background signal is gathered
And corresponding temperature, each background signal are the characteristic value of first arrival ripple of Lamb wave；(3) each group base that will be collected
Line signal and corresponding temperature are stored in benchmark database.
Slab structure is in during use, may be damaged inside it, and during detection, which is board under test shape
Structure.To the slab structure collection current demand signal s_c and Current Temperatures t to be measured, wherein, in the collection and S2 of current demand signal
Collection to background signal is identical：(1) PZT (piezoelectric transducer) excites slab structure to be measured with specific incentives frequency, to produce blue nurse
Ripple；(2) current demand signal and Current Temperatures are gathered, wherein, current demand signal is the characteristic value of first arrival ripple of Lamb wave.
According to background signal in baseline database and the correspondence of temperature, determine to believe with current basic line with reference to Current Temperatures
Number, calculate difference signal s_s=current baseline signal s_b- current demand signals s_c.
Damage index DI is finally calculated according to difference signal s_s and current baseline signal s_b, if damage index DI exceeds
Predetermined threshold value, then judge that the slab structure to be measured is damaged, if damage index DI judges that this is treated without departing from predetermined threshold value
Slab structure is surveyed not damage.Wherein, predetermined threshold value is carried out according to the installation site of the slab structure and intensity requirement etc.
Setting, be not specifically limited herein, when damage index exceedes the predetermined threshold value, illustrate needs the slab structure is studied for a second time courses one has flunked or
Replace, to avoid danger, and when damage index is without departing from the predetermined threshold value, which does not have defect or the defect smaller
In controlled range, danger is had no, can be continuing with.
That is, the present embodiment using base-line method detection slab structure damage process in, calculate difference signal when
Background signal is that temperature benefit is considered when calculating difference signal with Current Temperatures corresponding background signal in benchmark database
Repay, effectively weaken and sent out since temperature change is larger for influence of the PZT (piezoelectric transducer) to damage check, even environment temperature
It is raw to change, the accuracy of testing result will not be influenced, improves damage check precision, avoids that there are security risk.
In the above-described embodiments, damage index DI is the ENERGY E _ s and current baseline signal s_b according to difference signal s_s
What the ratio of ENERGY E _ b was calculated, i.e. DI=E_s/E_b.The energy of signal is counted according to following energy balane formula
Calculate：
Wherein, te、tsRespectively the beginning and ending time in the section of first arrival ripple of Lamb wave, s (t) is PZT (piezoelectric transducer)
The energy of the voltage signal detected, i.e. signal is respectively t for beginning and ending time of the voltage signal in sectione、tsIntegration.Certainly,
In the present embodiment, damage index DI can also be voltage signal according to difference signal s_s and the electricity of current baseline signal s_b
The ratio of pressure signal is calculated, and sets corresponding predetermined threshold value to judge the degree of impairment of the slab structure.But
During by the energy value of signal to calculate damage index DI, this can be intuitively reflected from the curve map corresponding to the damage index
The specific degree of impairment of slab structure, size, depth such as crackle, in order to be prevented the damage or further grasped
Make.
In the present embodiment, to ensure the accuracy of testing result, benchmark database needs the background signal by sufficient amount
Correspondence therebetween is determined with corresponding temperature.In step s 2, during the foundation of benchmark database, adopt
When collecting background signal, slab structure is complete at this time, undamaged, and the energy of the background signal gathered should meet specific height
This distribution occasion, if not meeting, needs to check that piezoelectricity changes in the beginning and ending time in the section of first arrival ripple of Lamb wave or S1
Whether the arrangement of energy device array is suitable.That is, while benchmark database is established, also to first arrival of Lamb wave
The beginning and ending time in the section of ripple and the arrangement of piezoelectric transducer array are adjusted, wherein, to the piezoelectric transducer array
The adjusting of arrangement includes the adjusting of the specific location of each PZT (piezoelectric transducer), spacing, quantity etc., is further ensured that to the plate shape knot
The accuracy of result during structure progress damage check.
Such as when the region-of-interest to rail vehicle slab structure carries out damage check, the region-of-interest is generally according to rack
Experiment, simulation analysis, railroad embankment experience and design requirement etc., need to set the arrangement of piezoelectric transducer array in detail
Meter, on the one hand meets the needs of detecting region-of-interest, and on the other hand, the distance between PZT (piezoelectric transducer) should not be too short, avoids the
One reaches ripple and is fallen into oblivion by system interference, also unsuitable long, avoids first from reaching ripple and includes excessive circuit noise.
In step s 5, if the damage index of testing result is without departing from predetermined threshold value, and the energy of current demand signal meets
In benchmark database during the particular Gaussian distribution occasion of the energy of background signal, it meets in benchmark database to background signal
It is required that the current demand signal and Current Temperatures can be included in benchmark database, that is to say, that in detection process, constantly expand
Background signal amount in database, and the background signal amount in benchmark database is bigger, the correspondence of itself and temperature is also more
Accurately, so ensure testing result accuracy.
The calculating of energy for background signal and the calculating for the energy of current demand signal in the above-described embodiments is
Calculated according to above-mentioned energy balane formula.
Wherein, particular Gaussian distribution occasion is in the frequency range of Gaussian Profile 5%~95%, that is to say, that when being adopted
The energy of the background signal of collection is included in benchmark database in the frequency range of energy Gaussian Profile 5%~95%, if
Do not meet, then check whether the beginning and ending time in the section of first arrival ripple of Lamb wave or the array arrangement of PZT (piezoelectric transducer) close
It is suitable, so that the beginning and ending time in the section of first arrival ripple to Lamb wave and the array arrangement of PZT (piezoelectric transducer) are adjusted.
If the damage index of current demand signal is without departing from predetermined threshold value, and its energy is in the frequency range of energy Gaussian Profile 5%~95%
It is interior, then the current demand signal and Current Temperatures are included in benchmark database, if not meeting, do not included benchmark database
It is interior, to avoid by some signals with latent defect, letter the defects of degree of injury as corresponding to not up to predetermined threshold value
Number include in benchmark database, in order to avoid influence the accuracy of testing result.
In the above-described embodiments, during being acquired to background signal and current demand signal, signal is filtered
Involve reconstruct, disturbed to avoid gathering during signal be subject to clutter.Exemplified by carrying out damage check to the slab structure of train, by
The ambient noises such as vibratory impulse, electromagnetic interference in be subject to train travelling process are influenced, when gathering signal to signal into
Row filtering and reconstruct can will become apparent from first arrival ripple, easy to divide testing result to avoid the interference of clutter
Analyse and improve the accuracy of testing result.
In the present embodiment, signal energy is concentrated on by narrow-band by bandpass filtering, such as 250 (specific incentives frequencies) ±
50kHz filters other band noises, to ensure the accuracy of testing result, certainly, in the present embodiment, can also pass through low pass
Signal is filtered in filtering or high-pass filtering, can specifically be made choice according to the situation of ripple and the situation of clutter.
In addition, to reconstruction signal firstly the need of determine first arrival ripple section beginning and ending time, in the present embodiment,
The beginning and ending time that Wavelet Transform determines the section of first arrival ripple is employed, other methods such as Xi Er can also be used certainly
Bert method of changing etc. determines.
In the present embodiment, above-mentioned current baseline signal, is to use each baseline number in least square fitting benchmark database
According to the relation with temperature, and combine the Current Temperatures gathered in S3 and determine.That is, internal system can use least square
The correspondence of each background signal and temperature in method fitting benchmark database, with reference to the Current Temperatures gathered, determines and is somebody's turn to do
The corresponding background signal of Current Temperatures.In detection process, the amount of the base-line data in benchmark database can change, benchmark
In database each background signal and the correspondence of temperature can also occur it is corresponding change, when data volume reaches it is a certain amount of after, two
Relation between person is stablized relatively.
Specifically, the damage check flow of the slab structure of the embodiment of the present invention is as shown in Fig. 2, wherein FAW refers to first
The characteristic value of first arrival ripple of a Lamb wave.After piezoelectric transducer array is arranged in slab structure, the collection to signal
Including two kinds, one kind is that background signal is gathered in the case where slab structure is in good working condition to establish benchmark database, and one kind is inspection
Gather current demand signal during survey, equal collecting temperature data while two kinds of signal acquisitions, and gather the method all same of signal
Including：Version type structure is excited with specific incentives frequency, the signal of collection is filtered and reconstructed to go the interference of noise wave removing.Really
The beginning and ending time in the section of the FAW of the fixed reconstruction signal, to calculate the energy of signal.
If establishing benchmark database, slab structure is in good working condition, while gathers background signal and temperature, calculates
The energy of the background signal, if the specific Gaussian Profile of energy that the energy of the background signal meets signal in benchmark database will
Ask, then include the background signal and temperature in benchmark database, if the energy of the background signal is not met in benchmark database
The specific Gaussian Profile requirement of the energy of signal, then to beginning and ending time in the section of the FAW of the energy that calculates the background signal into
Row checks, is adjusted accordingly if design is improper, if the beginning and ending time in the section of FAW is designed without problem, to the pressure in S1
The arrangement of electric transducer array is checked, is adjusted if design is improper, if the collection of the no problem background signal may
There are reasons such as other maloperations, given up.
After enough temperature datas are included in benchmark database, during being detected to slab structure, collection is worked as
Front signal s_c and Current Temperatures, and closed by the way that the background signal in least square fitting benchmark database is corresponding with temperature
System, determines background signal corresponding with Current Temperatures, that is, current baseline signal s_b, and calculates difference signal s_s=s_b-s_c.Meter
ENERGY E _ s of difference signal s_s and ENERGY E _ b, the damage index DI=E_s/E_b of current baseline signal are calculated, is preset if DI exceedes
Threshold value, then the slab structure damage, if DI not less than predetermined threshold value, and the ENERGY E of current demand signal _ c load base values
According to the particular Gaussian distribution occasion of signal energy in storehouse, then the current demand signal and Current Temperatures are included in benchmark database, with
Expand the temperature data in benchmark database.
It the above is only the preferred embodiment of the present invention, it is noted that come for those skilled in the art
Say, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications also should be regarded as
Protection scope of the present invention.
Claims (9)
1. a kind of damage detecting method of slab structure, it is characterised in that include the following steps：
S1：Piezoelectric transducer array is arranged in slab structure；
S2：Establish benchmark database：
(1) PZT (piezoelectric transducer) excites undamaged slab structure with specific incentives frequency, to produce Lamb wave；
(2) multigroup background signal and corresponding temperature are gathered, each background signal is first of the Lamb wave and arrives
Up to the characteristic value of ripple；
(3) background signal described in each group and corresponding temperature are stored in the benchmark database；
S3：The current demand signal and Current Temperatures of slab structure to be measured are gathered in the method identical with (1), (2) in S2；
S4：Difference signal is calculated, the difference signal=current baseline signal-current demand signal, the current baseline signal is the base
Background signal corresponding with the Current Temperatures in quasi- database；
S5：Damage index is calculated according to difference signal and with the current baseline signal, if the damage index exceeds predetermined threshold value,
Then judge that the slab structure to be measured is damaged, if the damage index without departing from the predetermined threshold value, judge described in treat
Slab structure is surveyed not damage.
2. damage detecting method according to claim 1, it is characterised in that the energy of the damage index=difference signal/
The energy of current baseline signal, wherein, the energy of signal is calculated according to equation below：
<mrow>
<mi>E</mi>
<mo>=</mo>
<msubsup>
<mo>&Integral;</mo>
<msub>
<mi>t</mi>
<mi>s</mi>
</msub>
<msub>
<mi>t</mi>
<mi>e</mi>
</msub>
</msubsup>
<msup>
<mi>s</mi>
<mn>2</mn>
</msup>
<mrow>
<mo>(</mo>
<mi>t</mi>
<mo>)</mo>
</mrow>
<mi>d</mi>
<mi>t</mi>
</mrow>
Wherein te、tsThe beginning and ending time in the section of first arrival ripple of respectively described Lamb wave, s (t) is the piezoelectric energy-conversion
The voltage signal that device detects.
3. damage detecting method according to claim 2, it is characterised in that in S2, if the energy symbol of the background signal
Close particular Gaussian distribution occasion, then included in the benchmark database, if the energy of the background signal do not meet it is described
Particular Gaussian distribution occasion, then detect the section of first of Lamb wave arrival ripple beginning and ending time or S1 in piezoelectric energy-conversion
The arrangement of device array.
4. damage detecting method according to claim 2, it is characterised in that in S5, if the damage index is without departing from institute
Predetermined threshold value is stated, and the energy of the current demand signal meets the particular Gaussian point of the energy of background signal in the benchmark database
Cloth condition, then include the current demand signal and the Current Temperatures in the benchmark database.
5. the damage detecting method according to claim 3 or 4, it is characterised in that the particular Gaussian distribution occasion is height
In the frequency range of this distribution 5%~95%.
6. according to claim 1-4 any one of them damage detecting methods, it is characterised in that gather the background signal and adopt
During collecting the current demand signal, signal is filtered and is reconstructed.
7. damage detecting method according to claim 6, it is characterised in that be filtered using band logical mode.
8. damage detecting method according to claim 6, it is characterised in that the letter of reconstruct is determined using wavelet transformation
Number first arrival ripple section beginning and ending time.
9. according to claim 1-4 any one of them damage detecting methods, it is characterised in that the current baseline signal, is
Using the relation of each background signal and temperature in benchmark database described in least square fitting, and with reference to described current in S3
The background signal that temperature determines.
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| CN108732210A (en) * | 2018-05-28 | 2018-11-02 | 西安交通大学 | A kind of piezoelectric device fault of construction detection method based on impedance spectrum |
| CN110031552A (en) * | 2019-05-27 | 2019-07-19 | 嘉兴博感科技有限公司 | A kind of monitoring structural health conditions damage characteristic value calculating method |
| CN111208206A (en) * | 2020-02-20 | 2020-05-29 | 北京博感科技有限公司 | Composite material ultrasonic guided wave structure health monitoring method in temperature change environment |
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