CN107462635A - A kind of effect of vibration stress relief online rating system and method based on more acoustic emission sensor information fusions - Google Patents
A kind of effect of vibration stress relief online rating system and method based on more acoustic emission sensor information fusions Download PDFInfo
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Abstract
Card, analog line driver, vibrator, acoustic emission sensor group, preamplifier, main amplifier, data collecting card, support meanss are occurred based on the effect of vibration stress relief online rating system of more acoustic emission sensor information fusions, including master system, random waveform；Vibrator is fixed on the surface of workpiece, and workpiece is supported using flexible support meanss.Effect of vibration stress relief on-line evaluation method based on more acoustic emission sensor information fusions carries out data fusion to the acoustic emission signal collected using the data Layer blending algorithm based on variance contribution ratio in data Layer first, and then the acoustic emission signal after fusion is analyzed using wavelet analysis method.The present invention has the advantages of can online, reliably evaluating effect of vibration stress relief.
Description
Technical field
The present invention relates to vibration aging technology field, when refering in particular to a kind of vibration based on more acoustic emission sensor information fusions
Imitate effect online rating system and method.
Technical background
The effect assessment of vibration aging technology is one of the key issue in vibration aging technology field.Oscillating aging skill at present
The effect evaluation method of art mainly includes：Parameter curve rating method, residual stress measurement method, precision stability detection method and dynamic
Stress criterion method.
(1) parameter curve rating method
Parameter curve rating method be according to parameter during oscillating aging occur regular variation phenomenon sum up come,
Qualitative evaluation can be carried out to the effect of oscillating aging, interpretational criteria used mainly includes：During oscillating aging during amplitude
Flattening after rising occurs in half interval contour, rise after decline and be then leveled off；The resonance peak ratio of frequency sweep curve shakes after vibration stress relief treatment
Raised before dynamic Ageing Treatment；The resonant frequency of frequency sweep curve before vibration stress relief treatment than reducing after vibration stress relief treatment；During vibration
Narrow after effect processing before the bandwidth ratio vibration stress relief treatment of frequency sweep curve.Parameter curve rating method be although it is a kind of online, directly perceived,
Quickly and easily method, but during use parameter curve rating method evaluation effect of vibration stress relief, single add only is arranged on workpiece
Velocity sensor, because the acceleration signal that acceleration transducer collection is returned easily is disturbed by extraneous factor, and work as
When acceleration transducer breaks down, it not is the real acceleration signal of workpiece that can cause the signal that collection is returned, and these
The appearance of situation all can cause parameter curve rating method can not accurately and reliably evaluate effect of vibration stress relief.
(2) residual stress measurement method
In order to accurately evaluate the effect of oscillating aging regulation and control residual stress, it is necessary to assess Workpiece vibration timeliness exactly
Front and rear residual stress, but the residual stress distribution situation of workpiece surface, particularly some complex part surface residual stresses
Distribution, be difficult to adopt theoretical calculation method carry out analysis and solution, so using experiment measurement method assess workpiece
The size of surface residual stress has important practical significance.The experimental measurement method of residual stress mainly includes at present：Damage
Mechanical measurement method and lossless physical measurement method, can quantify assess Workpiece vibration Ageing Treatment before and after residual stress.
Mechanical measurement method mainly includes orifice method, slitting method etc.；Physical measurement method mainly includes x-ray method, supercritical ultrasonics technology etc..Remnants should
Power mensuration belongs to offline evaluation method, timeliness effect can only be evaluated after oscillating aging process terminates, and residual
Residue stress mensuration is costly, and time-consuming, is not easy to apply in the fast production scene of rhythm.
(3) precision stability detection method
Precision stability detection method is to evaluate vibration aging technology by detecting the precision after Workpiece vibration Ageing Treatment
Effect, qualitative evaluation can be carried out to the effect of vibration aging technology, mainly including long-term placement precision method plus dynamic loading after
Precision method etc..Long-term placement precision method is by the long-term placement of workpiece after vibration stress relief treatment and periodic detection workpiece
Dimensional stability, concrete operations flow are detected for the first time when placing 15 days, later detection every 30 days once, total placement
Time should be more than half a year；Precision method is to detect the workpiece after vibration stress relief treatment in dynamic load effect after adding dynamic loading
The variable quantity of dimensional accuracy afterwards.Precision stability detection method falls within qualitatively evaluation method, its medium-term and long-term placement precision method
Time-consuming for test process, there is significant limitation.Although add precision method after dynamic loading quick, to measuring apparatus required precision
High, operating difficulties, it is difficult to popularize.
(4) dynamic stress criterion method
The Chen Ligong professors team of Shanghai Communications University proposes dynamic stress criterion method, because dynamic stress is as oscillating aging
During most important parameter, it is inevitable certain correlation to be present with effect of vibration stress relief.They, which study, finds dynamic stress and remnants
Quantitative non-linear dependencies between stress release effect be present, and by mathematical regression analysis and curve matching obtain them it
Between approximate function DP-CH equations, can during oscillating aging on-line checking dynamic stress, real-time quantitative judge vibration
The effect of timeliness.But dynamic stress criterion method is approximate with timeliness effect relation to dynamic stress according to field application experience, is commented
Valency precision is low, and dynamic stress measurement is difficult with assessing, and vibration aging technology national standard not yet provides to it, influences in addition
The factor of dynamic stress criterion is a lot, such as Fine Texture of Material, external condition.Therefore, dynamic stress criterion method and imperfection, also need into
Row is substantial amounts of to be tested to establish dynamic stress criterion form.
When material is deformed in loading process, the phenomenon of strain energy, referred to as sound emission are discharged in the form of elastic wave.
Using acoustic emission signal is detected, the technology of Dynamic Non-Destruction Measurement, referred to as acoustic emission are carried out to material.In oscillating aging process
The dislocation of middle material internal can produce microscopic motion, so as to cause material to produce plastic deformation.In summary, sound can be used to send out
Penetrate technology and Dynamic Non-Destruction Measurement is carried out to the workpiece during oscillating aging, and the acoustic emission signal to detecting is analyzed,
With this evaluate oscillating aging whether generate eliminate residual stress effect.
For insufficient existing for existing effect of vibration stress relief evaluation method, the present invention proposes that one kind is based on more voice sending sensors
The effect of vibration stress relief online rating system and method for device information fusion, that is, establish based on more acoustic emission sensor information fusions
Effect of vibration stress relief online rating system, for carrying out online, reliable evaluation to effect of vibration stress relief.
The content of the invention
For insufficient existing for existing effect of vibration stress relief evaluation method, the present invention proposes that one kind is based on more voice sending sensors
The effect of vibration stress relief online rating system and method for device information fusion, that is, establish based on more acoustic emission sensor information fusions
Effect of vibration stress relief online rating system, for carrying out online, reliable evaluation to effect of vibration stress relief.
Based on the effect of vibration stress relief online rating system of more acoustic emission sensor information fusions, including master system,
Card, analog line driver, vibrator, acoustic emission sensor group, preamplifier, main amplifier, data acquisition occur for random waveform
Card, support meanss；Vibrator is fixed on the surface of workpiece, and workpiece is supported using flexible support meanss；
Card output amplitude and the sinusoidal excitation of frequency independence and continuously adjustabe occur for master system control random waveform
Signal；The sinusoidal excitation signal that card output occurs for random waveform is input to vibrator, driving vibrator production via analog line driver
Raw vibration；
Acoustic emission sensor in acoustic emission sensor group is arranged on workpiece, and the sound emission in acoustic emission sensor group passes
The output end of sensor and the input of preamplifier connect, and the output end of preamplifier and the input of main amplifier connect
Connect, the output end of main amplifier and the input of data collecting card connect, and output end and the master system of data collecting card connect
Connect；
Master system includes the acoustic emission signal acquisition module for obtaining the acoustic emission signal that data collecting card collects, base
Module, acoustic emission signal Fusion Module are write in the data Layer blending algorithm of variance contribution ratio, the acoustic emission signal after fusion is deposited
Store up module, the Analysis of Acoustic Emission Signal module after the fusion based on wavelet analysis method, the Analysis of Acoustic Emission Signal result after fusion
Memory module, the Analysis of Acoustic Emission Signal result display module after fusion.
Further, support meanss are flexible member.
Further, the acoustic emission sensor number S included in acoustic emission sensor group is positive integer, and S >=3.
The sensor that the present invention uses is acoustic emission sensor, is same type sensor, therefore acoustic emission signal only needs
To be merged in data Layer, the present invention is using the data Layer blending algorithm based on variance contribution ratio.
If certain acoustic emission sensor collects an acoustic emission signal of workpiece with a certain sample frequency in sampling time t
Data sequence M (k), its discrete k are respectively m according to value1,m2,…,mk.Define data value miTo what is gathered in time t
The variance contribution ratio of data sequence is
In formula：Respectively discrete signal M (k) average and variance.
When having S similar acoustic emission sensors in certain time length while when gathering k sound emission data, if sound emission
Q-th of data of sensor s collections are msq, according to equation (1), its variance contribution ratio can be expressed as
In formula：μs、The respectively desired value and variance for the k discrete signal that s acoustic emission sensors collect.
According to the variance contribution ratio of different measuring points acoustic emission signal time data, q-th of acoustic emission sensor s collections
Data msqThe fusion coefficients λ of distributionsqFor
Then the value of q points is after data fusion
Data Layer Fusion Model based on variance contribution ratio is carried out to S acoustic emission sensor in q-th of data point first
Fusion, obtains Mq, then q=1,2 ..., k are traveled through, you can with the time-history curves of signal after being merged.
Effect of vibration stress relief on-line evaluation method based on more acoustic emission sensor information fusions comprises the following steps：
(1), workpiece is fixedly connected with vibrator；Workpiece is supported by flexible support meanss, so as to
Vibrator carries out exciting to workpiece；Acoustic emission sensor in acoustic emission sensor group is arranged on workpiece；Connect host computer
System and random waveform block between signal link；The signal that random waveform occurs between card and analog line driver is connected to connect
Line；The signal link connected between analog line driver and vibrator；The letter connected between acoustic emission sensor and preamplifier
Number line；The signal link connected between preamplifier and main amplifier；Connect between main amplifier and data collecting card
Signal link；The signal link connected between data collecting card and master system；Connect master system, random waveform occurs
Card, analog line driver, vibrator, preamplifier, the power supply of main amplifier and data collecting card；
(2), master system control random waveform occurs to block carries out frequency sweep vibration to workpiece, so that it is determined that oscillating aging
Driving frequency；
(3), slowly the gain knob of regulation analog line driver makes analog line driver export constant electric current, drives vibrator
Vibration stress relief treatment is carried out to workpiece；
(4), the acoustic emission signal acquisition module in master system obtains the acoustic emission signal that data collecting card collects；
The data Layer blending algorithm based on variance contribution ratio in master system, which is write in module, to be write based on variance contribution ratio
Data Layer blending algorithm program；The sound emission collected in acoustic emission signal Fusion Module to storage acoustic emission sensor group is believed
The acoustic emission signal stored in number memory module carries out data fusion；By the sound after the acoustic emission signal storage to fusion after fusion
Transmission signal memory module；Analysis of Acoustic Emission Signal module after fusion based on wavelet analysis method is believed the sound emission after fusion
Number carry out wavelet analysis, and by after fusion Analysis of Acoustic Emission Signal result storage to fusion after Analysis of Acoustic Emission Signal result
Memory module；Analysis of Acoustic Emission Signal result display module after fusion shows to the Analysis of Acoustic Emission Signal result after fusion
Show；
(5) effect of vibration stress relief is evaluated using the characteristic frequency after the acoustic emission signal wavelet analysis after fusion,
When the acoustic emission signal after fusion has certain sound emission frequency range after wavelet analysis, show workpiece by vibration
Effect is generated after Ageing Treatment.
The present invention technical concept be：Card, analog line driver, vibrator, sound hair are occurred by master system, random waveform
Sensor group, preamplifier, main amplifier, data collecting card and support meanss composition is penetrated based on more acoustic emission sensors to believe
Cease the effect of vibration stress relief online rating system of fusion；Using data Layer blending algorithm based on variance contribution ratio to collecting
Acoustic emission signal carries out data fusion in data Layer, and then the acoustic emission signal after fusion is divided using wavelet analysis method
Analysis, when the acoustic emission signal after fusion has certain sound emission frequency range after wavelet analysis, show that workpiece passes through
Effect is generated after vibration stress relief treatment.
Beneficial effects of the present invention are as follows：
1st, during parameter curve rating method evaluation effect of vibration stress relief, single acceleration transducer is only arranged on workpiece, by
Easily disturbed in the acceleration signal that acceleration transducer collection is returned by extraneous factor, and when acceleration transducer goes out
During existing failure, it not is the real acceleration signal of workpiece that can cause the signal that collection is returned, and the appearance of these situations all can
Parameter curve rating method is caused can not accurately and reliably to evaluate effect of vibration stress relief, and the present invention is with multi-sensor technology and information
Based on integration technology, build the effect of vibration stress relief online rating system based on more acoustic emission sensor information fusions can gram
Existing deficiency when taking traditional parameters curve rating method evaluation effect of vibration stress relief, is carried out so as to realize to effect of vibration stress relief
Line, reliable evaluation.
2nd, it is proposed by the present invention compared to residual stress measurement method, precision stability detection method and dynamic stress criterion method
Method, which can be realized, carries out online, reliable evaluation to effect of vibration stress relief.
3rd, effect of vibration stress relief online rating system proposed by the present invention based on more acoustic emission sensor information fusions and
Method will not produce damage when evaluating effect of vibration stress relief to workpiece, belong to lossless evaluation method.
4th, the effect of vibration stress relief online rating system pair proposed by the present invention based on more acoustic emission sensor information fusions
When effect of vibration stress relief carries out on-line evaluation, it is controlled by master system, without manually operated, reduces work
Amount, improves operating efficiency.
5th, effect of vibration stress relief online rating system proposed by the present invention based on more acoustic emission sensor information fusions and
Method, which can be realized, carries out online, reliable evaluation to effect of vibration stress relief, is provided to study the evaluation method of effect of vibration stress relief
New thinking.
Brief description of the drawings
Effect of vibration stress relief online rating system schematic diagrames of the Fig. 1 based on more acoustic emission sensor information fusions.
Data Layer Fusion Model schematic diagrames of the Fig. 2 based on variance contribution ratio.
Embodiment
Referring to the drawings, the present invention is further illustrated：
Based on the effect of vibration stress relief online rating system of more acoustic emission sensor information fusions, including master system,
Card, analog line driver, vibrator, acoustic emission sensor group, preamplifier, main amplifier, data acquisition occur for random waveform
Card, support meanss；Vibrator is fixed on the surface of workpiece, and workpiece is supported using flexible support meanss；
Card output amplitude and the sinusoidal excitation of frequency independence and continuously adjustabe occur for master system control random waveform
Signal；The sinusoidal excitation signal that card output occurs for random waveform is input to vibrator, driving vibrator production via analog line driver
Raw vibration；
Acoustic emission sensor in acoustic emission sensor group is arranged on workpiece, and the sound emission in acoustic emission sensor group passes
The output end of sensor and the input of preamplifier connect, and the output end of preamplifier and the input of main amplifier connect
Connect, the output end of main amplifier and the input of data collecting card connect, and output end and the master system of data collecting card connect
Connect；
Master system includes the acoustic emission signal acquisition module for obtaining the acoustic emission signal that data collecting card collects, base
Module, acoustic emission signal Fusion Module are write in the data Layer blending algorithm of variance contribution ratio, the acoustic emission signal after fusion is deposited
Store up module, the Analysis of Acoustic Emission Signal module after the fusion based on wavelet analysis method, the Analysis of Acoustic Emission Signal result after fusion
Memory module, the Analysis of Acoustic Emission Signal result display module after fusion.
Further, support meanss are flexible member.
Further, the acoustic emission sensor number S included in acoustic emission sensor group is positive integer, and S >=3.
The sensor that the present invention uses is acoustic emission sensor, is same type sensor, therefore acoustic emission signal only needs
To be merged in data Layer, the present invention is using the data Layer blending algorithm based on variance contribution ratio.
If certain acoustic emission sensor collects an acoustic emission signal of workpiece with a certain sample frequency in sampling time t
Data sequence M (k), its discrete k are respectively m according to value1,m2,…,mk.Define data value miTo what is gathered in time t
The variance contribution ratio of data sequence is
In formula：Respectively discrete signal M (k) average and variance.
When having S similar acoustic emission sensors in certain time length while when gathering k sound emission data, if sound emission
Q-th of data of sensor s collections are msq, according to equation (1), its variance contribution ratio can be expressed as
In formula：μs、The respectively desired value and variance for the k discrete signal that s acoustic emission sensors collect.
According to the variance contribution ratio of different measuring points acoustic emission signal time data, q-th of acoustic emission sensor s collections
Data msqThe fusion coefficients λ of distributionsqFor
Then the value of q points is after data fusion
Data Layer Fusion Model based on variance contribution ratio is carried out to S acoustic emission sensor in q-th of data point first
Fusion, obtains Mq, then q=1,2 ..., k are traveled through, you can with the time-history curves of signal after being merged.
Effect of vibration stress relief on-line evaluation method based on more acoustic emission sensor information fusions comprises the following steps：
(1), workpiece is fixedly connected with vibrator；Workpiece is supported by flexible support meanss, so as to
Vibrator carries out exciting to workpiece；Acoustic emission sensor in acoustic emission sensor group is arranged on workpiece；Connect host computer
System and random waveform block between signal link；The signal that random waveform occurs between card and analog line driver is connected to connect
Line；The signal link connected between analog line driver and vibrator；The letter connected between acoustic emission sensor and preamplifier
Number line；The signal link connected between preamplifier and main amplifier；Connect between main amplifier and data collecting card
Signal link；The signal link connected between data collecting card and master system；Connect master system, random waveform occurs
Card, analog line driver, vibrator, preamplifier, the power supply of main amplifier and data collecting card；
(2), master system control random waveform occurs to block carries out frequency sweep vibration to workpiece, so that it is determined that oscillating aging
Driving frequency；
(3), slowly the gain knob of regulation analog line driver makes analog line driver export constant electric current, drives vibrator
Vibration stress relief treatment is carried out to workpiece；
(4), the acoustic emission signal acquisition module in master system obtains the acoustic emission signal that data collecting card collects；
The data Layer blending algorithm based on variance contribution ratio in master system, which is write in module, to be write based on variance contribution ratio
Data Layer blending algorithm program；The sound emission collected in acoustic emission signal Fusion Module to storage acoustic emission sensor group is believed
The acoustic emission signal stored in number memory module carries out data fusion；By the sound after the acoustic emission signal storage to fusion after fusion
Transmission signal memory module；Analysis of Acoustic Emission Signal module after fusion based on wavelet analysis method is believed the sound emission after fusion
Number carry out wavelet analysis, and by after fusion Analysis of Acoustic Emission Signal result storage to fusion after Analysis of Acoustic Emission Signal result
Memory module；Analysis of Acoustic Emission Signal result display module after fusion shows to the Analysis of Acoustic Emission Signal result after fusion
Show；
(5) effect of vibration stress relief is evaluated using the characteristic frequency after the acoustic emission signal wavelet analysis after fusion,
When the acoustic emission signal after fusion has certain sound emission frequency range after wavelet analysis, show workpiece by vibration
Effect is generated after Ageing Treatment.
Content described in this specification embodiment is only enumerating to the way of realization of inventive concept, protection of the invention
Scope is not construed as being only limitted to the concrete form that embodiment is stated, protection scope of the present invention is also and in art technology
Personnel according to present inventive concept it is conceivable that equivalent technologies mean.
Claims (4)
1. based on the effect of vibration stress relief online rating system of more acoustic emission sensor information fusions, including master system, appoint
Anticipate waveform occur card, analog line driver, vibrator, acoustic emission sensor group, preamplifier, main amplifier, data collecting card,
Support meanss；Vibrator is fixed on the surface of workpiece, and workpiece is supported using flexible support meanss；
Card output amplitude and the sinusoidal excitation signal of frequency independence and continuously adjustabe occur for master system control random waveform；
The sinusoidal excitation signal that card output occurs for random waveform is input to vibrator via analog line driver, and driving vibrator, which produces, to shake
It is dynamic；
Acoustic emission sensor in acoustic emission sensor group is arranged on workpiece, the acoustic emission sensor in acoustic emission sensor group
Output end and the input of preamplifier connect, the input of the output end of preamplifier and main amplifier connects, main
The output end of amplifier and the input of data collecting card are connected, and the output end of data collecting card is connected with master system；
Master system includes the acoustic emission signal acquisition module for obtaining the acoustic emission signal that data collecting card collects, based on side
The data Layer blending algorithm of poor contribution rate writes module, acoustic emission signal Fusion Module, the acoustic emission signal storage mould after fusion
Block, the Analysis of Acoustic Emission Signal module after the fusion based on wavelet analysis method, the Analysis of Acoustic Emission Signal result storage after fusion
Module, the Analysis of Acoustic Emission Signal result display module after fusion.
2. the effect of vibration stress relief online rating system as claimed in claim 1 based on more acoustic emission sensor information fusions,
It is characterized in that：Support meanss are flexible member.
3. the effect of vibration stress relief online rating system as claimed in claim 1 based on more acoustic emission sensor information fusions,
It is characterized in that：The acoustic emission sensor number S included in acoustic emission sensor group is positive integer, and S >=3.
4. use the effect of vibration stress relief on-line evaluation based on more acoustic emission sensor information fusions as described in claim 1-3
System, the method that on-line evaluation is carried out to effect of vibration stress relief comprise the following steps：
(1), workpiece is fixedly connected with vibrator；Workpiece is supported by flexible support meanss, so as to exciting
Device carries out exciting to workpiece；Acoustic emission sensor in acoustic emission sensor group is arranged on workpiece；Connect master system
Signal link between blocking with random waveform；Random waveform is connected to occur to block the signal link between analog line driver；
The signal link connected between analog line driver and vibrator；The signal connected between acoustic emission sensor and preamplifier connects
Line；The signal link connected between preamplifier and main amplifier；The signal connected between main amplifier and data collecting card
Line；The signal link connected between data collecting card and master system；Connect master system, random waveform occur card,
Analog line driver, vibrator, preamplifier, the power supply of main amplifier and data collecting card；
(2), card occurs for master system control random waveform to workpiece progress frequency sweep vibration, so that it is determined that the excitation of oscillating aging
Frequency；
(3), slowly the gain knob of regulation analog line driver makes analog line driver export constant electric current, and driving vibrator is to work
Part carries out vibration stress relief treatment；
(4), the acoustic emission signal acquisition module in master system obtains the acoustic emission signal that data collecting card collects；Upper
The data Layer blending algorithm based on variance contribution ratio in the machine system of position, which is write, writes the data based on variance contribution ratio in module
Layer blending algorithm program；The acoustic emission signal collected in acoustic emission signal Fusion Module to storage acoustic emission sensor group is deposited
The acoustic emission signal stored in storage module carries out data fusion；By the sound emission after the acoustic emission signal storage to fusion after fusion
Signal memory module；Analysis of Acoustic Emission Signal module after fusion based on wavelet analysis method is entered to the acoustic emission signal after fusion
Row wavelet analysis, and the Analysis of Acoustic Emission Signal result after the Analysis of Acoustic Emission Signal result storage to fusion after fusion is stored
Module；Analysis of Acoustic Emission Signal result display module after fusion is shown to the Analysis of Acoustic Emission Signal result after fusion；
(5) effect of vibration stress relief is evaluated using the characteristic frequency after the acoustic emission signal wavelet analysis after fusion, when melting
When acoustic emission signal after conjunction has certain sound emission frequency range after wavelet analysis, show that workpiece passes through oscillating aging
Effect is generated after processing.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109613001A (en) * | 2018-11-07 | 2019-04-12 | 常州信息职业技术学院 | A kind of signal receiving and processing device that view-based access control model is conveyed |
| CN113390963A (en) * | 2021-05-11 | 2021-09-14 | 西安交通大学 | Laser shock peening quality on-line monitoring method based on time window energy attenuation coefficient |
| CN113984392A (en) * | 2021-10-29 | 2022-01-28 | 深圳技术大学 | Online testing and evaluating method for vibration quality of electric drive assembly system |
| CN117647587A (en) * | 2024-01-30 | 2024-03-05 | 浙江大学海南研究院 | Acoustic emission signal classification method, computer equipment and medium |
-
2017
- 2017-09-13 CN CN201710819768.5A patent/CN107462635A/en not_active Withdrawn
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109613001A (en) * | 2018-11-07 | 2019-04-12 | 常州信息职业技术学院 | A kind of signal receiving and processing device that view-based access control model is conveyed |
| CN113390963A (en) * | 2021-05-11 | 2021-09-14 | 西安交通大学 | Laser shock peening quality on-line monitoring method based on time window energy attenuation coefficient |
| CN113984392A (en) * | 2021-10-29 | 2022-01-28 | 深圳技术大学 | Online testing and evaluating method for vibration quality of electric drive assembly system |
| CN117647587A (en) * | 2024-01-30 | 2024-03-05 | 浙江大学海南研究院 | Acoustic emission signal classification method, computer equipment and medium |
| CN117647587B (en) * | 2024-01-30 | 2024-04-09 | 浙江大学海南研究院 | Acoustic emission signal classification method, computer equipment and medium |
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Application publication date: 20171212 |