CN103760243A - Microcrack nondestructive detecting device and method - Google Patents

Microcrack nondestructive detecting device and method Download PDF

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Publication number
CN103760243A
CN103760243A CN201410065059.9A CN201410065059A CN103760243A CN 103760243 A CN103760243 A CN 103760243A CN 201410065059 A CN201410065059 A CN 201410065059A CN 103760243 A CN103760243 A CN 103760243A
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tested
acoustic emission
signal
micro
crack
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CN201410065059.9A
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Chinese (zh)
Inventor
王向红
向建军
尹东
胡宏伟
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长沙理工大学
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Priority to CN201410065059.9A priority Critical patent/CN103760243A/en
Publication of CN103760243A publication Critical patent/CN103760243A/en

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Abstract

The invention discloses a microcrack ultrasound-sound emission nondestructive detecting device and method, relating to technique that an ultrasound transmitter generates an excitation source and then a sound emission technique is adopted to detect the microcrack damage in a member, that is, the ultrasound transmitter generates the excitation source on the surface of the member, a sound emission acquisition processing system acquires, amplifies, processes and analyzes a signal to obtain a non-linear characteristic parameter of the signal, and then existence of the microcrack damage in the detected member and the damage degree are judged. The device comprises the ultrasound transmitter, a sound emission sensor, a pre-amplifier, and a sound emission acquisition analyzing system. According to the invention, the ultrasonic technology and the sound emission technique are combined to construct a nondestructive detecting system having the functions of detecting static defects and dynamic defects, the microcrack of the member is detected, the member is rapidly integrally evaluated, and the defects that an existing sound emission method cannot detect the static defects and the ultrasound detection method is low in detecting efficiency and has difficulties in capturing the microcrack are overcome.

Description

A kind of micro-crack the cannot-harm-detection device and method
Technical field
The present invention relates to technical field of nondestructive testing, particularly a kind of micro-crack the cannot-harm-detection device and method.
Background technology
High-end mechanized equipment parts in the important industry of national economy (as engineering machinery, boats and ships, nuclear power, Aero-Space etc.), also have very large value after it is once retired, and therefore it is manufactured and arouse great concern again.Manufacturing is take product life cycle theory as guidance again, with waste product performance, realize great-leap-forward and be promoted to target, take high-quality, efficient, energy-conservation, material-saving, environmental protection as criterion, take advanced technology and industrialization, produce as means, repair, transform a series of technical measures of waste product or the general name of engineering activity.Manufacture again the military service week after date that blank (waste and old part) lives through one or many, in its structure, there will be certain damage or defect, become the key element that affects its serviceable life.
Therefore stress state, the degree of injury of manufacturing blank being assessed again, is that it manufactures the key issue that will solve before processing again.To manufacturing again the testing process of blank, be artificial preliminary screening-cleaning-conventional Non-Destructive Testing at present, but there are a large amount of undetected phenomenons in artificial screening process, undetected member is first cleaned to the very labor intensive material resources of flow process of rear detection; Conventional Non-Destructive Testing mainly adopts supercritical ultrasonics technology, and the method is insensitive to the micro-crack existing in detected member.Because great majority are manufactured extremely complexity of member service condition again, and ought manufacture again component assembly runtime and cannot detect and be short of damage quantitative detection.Therefore in general, current detection method exists that cost is high, poor reliability, range of application are narrow, can not take into account shortcomings such as manufacturing again blank Dynamic Crack and two kinds of situations of static crackle simultaneously.
Summary of the invention
The object of the present invention is to provide that a kind of detection efficiency is high, applied range, can realize dynamically and micro-crack the cannot-harm-detection device and method that static manufacture parts again detects.
The present invention adopts following technical scheme: a kind of micro-crack the cannot-harm-detection device, comprise ultrasonic generator, ultrasonic probe, tested member, ultrasonic generator is connected with tested member by ultrasonic probe, also comprise an acoustic emission device, described acoustic emission device comprises acoustic emission acquisition processing system, the calibrate AE sensor being connected with described tested member, connect the prime amplifier of described acoustic emission acquisition processing system and described calibrate AE sensor, between described ultrasonic probe and described tested member, be filled with couplant, between described calibrate AE sensor and described tested member, be filled with couplant.
As a further improvement on the present invention:
The ultrasonic probe of described ultrasonic generator is unidirectional probe, and the parameter of ultrasonic probe number and ultrasonic generator is determined according to detected object;
The number of active lanes of described acoustic emission acquisition analysis system be one and more than;
Described acoustic emission acquisition analysis system comprises signal gathering unit, signal amplification unit and signal processing unit;
Described couplant and couplant are vaseline.
A kind of micro-crack lossless detection method, comprises the following steps:
(1) determining of member emphasis position to be detected: according to the emphasis position to be detected of definite members such as the experience accumulation in the structure of tested member and production practices, production technology personnel's observation and theoretical analysis;
(2) determining of acoustic emission acquisition analysis system: determine the number of active lanes of acoustic emission acquisition analysis system and the type of calibrate AE sensor according to factors such as the shape of tested member, material, accuracy of detection; Because the structure of different component, size, material etc. are all not quite similar, therefore the needed port number of each detected member is also different.In order to meet different detected members or the requirement of the detection of large-scale component, the overall channel number of acoustic emission detection instrument is generally no less than 16.According to the characteristic of the material at position to be checked, shape etc., determine the frequency range that sensor need to be monitored, according to this scope, select suitable calibrate AE sensor.Due to the signal collecting generally a little less than, therefore the signal collecting after amplifying, prime amplifier to be sent into signal handling equipment, the equipment such as prime amplifier rationally should be placed simultaneously, prevent from due to checkout equipment, existing the factors such as physical perturbation when detecting, affect the collection result of signal, thereby affected the effect detecting;
(3) determining of calibrate AE sensor arrangement: according to the arrangement of definite calibrate AE sensors such as the geometric configuration at the position to be detected of tested member, volume size; For realizing the good coupling of sensor and detected component surface, before placement sensor, should remove the rust protection paint of tested component surface or other with milling tools such as sand paper may affect the spot of signals collecting result; At sensor and member contact site, should add vaseline as couplant simultaneously; Sometimes for guaranteeing collection effect or when component surface very irregular, calibrate AE sensor is pressed abd fixed on to component surface with the special magnetic support of plastics trench structure, to prevent that sensor from slip occurring and have influence on the collection of data in component surface;
(4) determining of tested member state: judge that tested member is in static or dynamic; Static state is that the crackle in member remains static, and is dynamically that crackle in member is in active state;
(5) detection method when tested member is static state:
A. ultrasonic generator a certain suitable surface emitting ultrasonic exciting except calibrate AE sensor placement-face in tested member position to be detected, as the simulation signal generator of acoustic emission acquisition analysis system; Wherein ultrasonic probe is unidirectional probe, and the parameter of ultrasonic probe number and ultrasonic generator is set according to choose reasonable such as detected Components Shape size, complexity, material behavior and the collectable frequency ranges of calibrate AE sensor;
Ultrasonic signal excitation position should opposed flattened, and the rust protection paint at this place on member or other greasiness removals should be fallen to guarantee arousal effect;
B. calibrate AE sensor gathers this signal, after prime amplifier amplifies, is sent to acoustic emission acquisition processing system;
C. acoustic emission acquisition analysis system receives signal, and signal is carried out to analyzing and processing; Because the signal form collecting comprises acoustic emission parameters and waveform signal, thereby signal processing unit also comprises two parts.Acoustic emission parameters adopts kernel independent component analysis method, and treatment scheme is: data normalization processing, calculate nuclear matrix, calculate eigenwert and the proper vector of nuclear matrix, by eigenwert and proper vector calculated characteristics spatial PCA, also retained as required the major component of certain contribution rate, to major component, adopt independent component analysis method to separate, obtain nonlinear characteristic parameters; Waveform signal is converted by FFT or wavelet transformation etc. carries out information that frequency domain or time frequency analysis obtain higher hamonic wave composition as characteristic parameter to it, the nonlinear characteristic parameters of last composite sound emission parameter and waveform signal characteristic parameter composition nonlinear characteristic parameters vector;
The nonlinear characteristic parameters vector contrast obtaining when d. the nonlinear characteristic parameters obtaining is vectorial and member is intact, judges whether tested member exists the degree of micro-crack and micro-cracks damage;
(6) detection method when tested member is dynamic:
A. directly with calibrate AE sensor Real-time Collection because of the acoustic emission signal of tested component inside because existing micro-crack to inspire;
B. after amplifying, prime amplifier is sent to acoustic emission acquisition analysis system;
C. acoustic emission acquisition processing system receives signal, and signal is carried out to analyzing and processing; Because the signal form collecting comprises acoustic emission parameters and waveform signal, thereby signal processing unit also comprises two parts.Acoustic emission parameters adopts kernel independent component analysis method, and treatment scheme is: data normalization processing, calculate nuclear matrix, calculate eigenwert and the proper vector of nuclear matrix, by eigenwert and proper vector calculated characteristics spatial PCA, also retained as required the major component of certain contribution rate, to major component, adopt independent component analysis method to separate, obtain nonlinear characteristic parameters; Waveform signal is converted by FFT or wavelet transformation etc. carries out information that frequency domain or time frequency analysis obtain higher hamonic wave composition as characteristic parameter to it, the nonlinear characteristic parameters of last composite sound emission parameter and waveform signal characteristic parameter composition nonlinear characteristic parameters vector;
The nonlinear characteristic parameters contrast obtaining when d. the nonlinear characteristic parameters obtaining is vectorial and member is intact, judges whether tested member exists the degree of micro-crack and micro-cracks damage.
Compared with prior art, the invention has the advantages that:
1. this cannot-harm-detection device comprises ultrasonic transmission device and acoustic emission signal acquisition processing system, to the tested member in dynamic or static, can carry out Non-Destructive Testing, easy to use, applied range;
2. by Acoustic emission signal processing unit, obtain the nonlinear characteristic parameters vector of tested member micro-crack; By nonlinear characteristic parameters vector, derive tested member and whether have micro-crack and micro-cracks damage degree, detection efficiency is high;
3. tested member, when static state, is launched excitation by ultrasonic transmission device, as signal source, has avoided applying secondary injury that extraneous mechanical load may cause member and the impact of neighbourhood noise.
Accompanying drawing explanation
Fig. 1 is micro-crack the cannot-harm-detection device entire system schematic diagram of the present invention.
Fig. 2 is that ultrasonic probe of the present invention and calibrate AE sensor are at tested component surface arrangenent diagram.
Fig. 3 is micro-crack lossless detection method process flow diagram of the present invention.
Fig. 4 is acoustic emission analysis disposal system Component units schematic diagram of the present invention.
Fig. 5 is a kind of micro-crack the cannot-harm-detection device of the present invention and method signal processing flow figure.
Fig. 6 is that ultrasonic probe of the present invention and calibrate AE sensor are at hydraulic turbine surface arrangenent diagram.
Fig. 7 is that embodiment of the present invention rotary wheel of water turbine micro-crack detects concrete steps process flow diagram.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is further described.
Micro-crack the cannot-harm-detection device as Figure 1-3, comprise ultrasonic generator 1, ultrasonic probe 2, tested member 3, ultrasonic generator 1 is connected with tested member 3 by ultrasonic probe 2, also comprise an acoustic emission device, described acoustic emission device comprises acoustic emission acquisition processing system 6, the calibrate AE sensor 4 being connected with described tested member 3, connect the prime amplifier 5 of described acoustic emission acquisition processing system 6 and described calibrate AE sensor 4, between described ultrasonic probe 2 and described tested member 3, be filled with couplant 8, between described calibrate AE sensor 4 and described tested member 3, be filled with couplant 7.
Described ultrasonic probe 2 adopts unidirectional probe, the parameter of the number of ultrasonic probe 2 and ultrasonic generator 1 is determined according to detected object, in embodiment as shown in Figure 6, ultrasonic probe 2 is 4, the centre frequency of ultrasonic generator 1 is 500kHz, and the excitation range of transmitting is that 100kHz-1MHz, output voltage are 300V.
The number of active lanes of described acoustic emission acquisition processing system 6 be one and more than, in embodiment, port number is 13 as shown in Figure 6.
Described acoustic emission acquisition processing system 6 comprises signal gathering unit, signal amplification unit and signal processing unit.Because the signal form collecting comprises acoustic emission parameters and waveform signal, thereby signal processing unit also comprises two parts, and acoustic emission parameters adopts kernel independent component analysis method, and treatment scheme is: data normalization processing, calculate nuclear matrix, calculate eigenwert and the proper vector of nuclear matrix, by eigenwert and proper vector calculated characteristics spatial PCA, also retained as required the major component of certain contribution rate, to major component, adopt independent component analysis method to separate, obtain nonlinear characteristic parameters; Waveform signal is converted by FFT or wavelet transformation etc. carries out information that frequency domain or time frequency analysis obtain higher hamonic wave composition as characteristic parameter to it, the nonlinear characteristic parameters of last composite sound emission parameter and waveform signal characteristic parameter composition nonlinear characteristic parameters vector.
Described couplant 7 and couplant 8 are vaseline.
Below in conjunction with embodiment shown in Fig. 6, francis turbine runner elaborates to a kind of micro-crack lossless detection method, comprises the following steps:
(1) determining of member emphasis position to be detected: being illustrated in figure 6 francis turbine runner diameter is 8m, maximum gauge is 8.6m, be highly 5.19m, runner bucket number is in 13(Fig. 6, only to draw two blades), runner material is stainless steel, according to actual experience accumulation, the blade of rotary wheel of water turbine is the region that very easily produces micro-crack, is therefore implemented in example, turbine blade to be defined as to emphasis and to detect position;
(2) determining of acoustic emission acquisition processing system: during francis turbine runner micro-crack is detected, acoustic emission system adopts the PCI-2 of U.S. physical acoustics company (PAC) system, comprises 8 PCI-2 channel plates, 18 A/D converters, AE application software AEwin and the signal processing unit of developing on its secondary development software.Because rotary wheel of water turbine has 13 blades, sensor of a blade arrangement, is 13 passages so select acoustic emission port number.In described embodiment, calibrate AE sensor is selected WDI type, centre frequency 500kHz, and its collectable signal frequency range is: 100kHz-1MHz; Signal amplification unit is selected 2/4/6 type prime amplifier, and enlargement factor is selected 40dB;
(3) determining of calibrate AE sensor arrangement: as shown in Fig. 6 embodiment, francis turbine runner micro-crack is detected, the large and surfacing of the probability that micro-crack appears in blade, therefore WDI type calibrate AE sensor is arranged on the blade of rotary wheel of water turbine, and in order to reduce error, the position that on every a slice blade, WDI type calibrate AE sensor is arranged all should be consistent substantially.In order to allow the good coupling on WDI type calibrate AE sensor and turbine runner blade surface, before placement sensor, should remove the rust protection paint on turbine blade surface or other with milling tools such as sand paper may affect the spot of signals collecting result; At sensor and blade contact site, should add vaseline as couplant simultaneously; With the special magnetic support of plastics trench structure, WDI calibrate AE sensor is pressed abd fixed on to turbine runner blade surface, to prevent that sensor from having influence on the collection of data in blade surface generation slip simultaneously;
(4) determining of tested member state: the detection of turbine blade is carried out under static state described in Fig. 6 in embodiment, the hydraulic turbine while out of service does not need additional mechanical load yet.At lower ring 9 places of rotary wheel of water turbine, voltage of ultrasonic generator transmitting is set as the ultrasonic exciting of 300V, as acoustic emission simulation signal generator; The WDI type calibrate AE sensor being arranged on turbine blade gathers this signal, after amplifying, prime amplifier sends into acoustic emission acquisition processing system, and by flow process described in Fig. 5, signal is carried out to analyzing and processing, draw the nonlinear characteristic parameters vector of obtained acoustic emission signal, the standard nonlinear characteristic parameter vector obtaining when intact to the nonlinear characteristic parameters vector obtaining and member contrasts, thereby judges tested member and whether exist the degree of micro-crack and micro-cracks damage.Described Fig. 6 is due to lower ring 9 opposed flattened, elect ultrasonic exciting transmitting position as, because runner is symmetrical structure, four ultrasonic probes 2 are arranged in the end of two perpendicular diameter in lower ring 9 centre positions, and by under the hydraulic turbine, encircle that 9 surfaces and the rust protection paint of ultrasonic probe contact site and other greasiness removals fall to guarantee launching effect, under rotary wheel of water turbine, encircle simultaneously 9 with pop one's head between should fill vaseline as couplant;
(5) when unit under test 3 is dynamic, detected member is under running status or plus load state, the ultrasonic exciting of launching without ultrasonic transmission device is as signal source, but directly calibrate AE sensor 4 is arranged in to the correct position on member 3, can judge equally the degree that whether has micro-crack and micro-cracks damage in tested member 3.By the present invention, just can realize the Non-Destructive Testing to there is micro-crack under member static state or current intelligence, one-time detection just can provide a globality evaluation to detected member micro-cracks damage, has reduced workload, has improved detection efficiency.
Above embodiment only for illustrate that the present invention does for example, not limitation of the present invention, in the situation that not departing from guiding theory of the present invention and scope, also can make other changes in different forms.The scope that patent protection of the present invention is defined by the claims is determined. ?

Claims (7)

1. micro-crack the cannot-harm-detection device, comprise ultrasonic generator 1, ultrasonic probe 2, tested member 3, ultrasonic generator 1 is connected with tested member 3 by ultrasonic probe 2, it is characterized in that: also comprise an acoustic emission device, described acoustic emission device comprises acoustic emission acquisition analysis system 6, the calibrate AE sensor 4 being connected with described tested member 3, the prime amplifier 5 being connected with described calibrate AE sensor 4 with described acoustic emission acquisition analysis system 6, between described ultrasonic probe 2 and described tested member 3, be filled with couplant 8, between described calibrate AE sensor 4 and described tested member 3, be filled with couplant 7.
2. according to a kind of micro-crack the cannot-harm-detection device described in claim 1, it is characterized in that: described ultrasonic probe 2 is unidirectional probe; According to detected object 3, determine the quantity of ultrasonic probe 2 and the parameter of ultrasonic generator 1.
3. according to a kind of micro-crack the cannot-harm-detection device described in claim 2, it is characterized in that: the number of active lanes of described acoustic emission acquisition analysis system 6 be one and more than.
4. according to a kind of micro-crack the cannot-harm-detection device described in claim 3, it is characterized in that: described acoustic emission acquisition analysis system 6 comprises signal gathering unit, signal amplification unit and signal processing unit.
5. according to a kind of micro-crack the cannot-harm-detection device described in claim 4, it is characterized in that: described acoustic emission acquisition analysis system signal processing unit is mainly the processing of composite sound emission parameter and waveform signal, acoustic emission parameters adopts kernel independent component analysis method, and treatment scheme is: data normalization processing, calculate nuclear matrix, calculate nuclear matrix eigenwert and proper vector, by eigenwert and proper vector calculated characteristics spatial PCA, also retained as required the major component of certain contribution rate, to major component, adopt five steps such as independent component analysis method separates to obtain nonlinear characteristic parameters; The information of higher hamonic wave composition that obtains frequency domain through FFT conversion or wavelet transformation for waveform signal is as characteristic parameter, the last nonlinear characteristic parameters of composite sound emission parameter and the characteristic parameter of waveform signal composition nonlinear characteristic parameters vector.
6. according to a kind of micro-crack the cannot-harm-detection device described in claim 5, it is characterized in that: described couplant 7 and couplant 8 are vaseline.
7. a micro-crack lossless detection method, is characterized in that:
(1) determining of member emphasis position to be detected: according to the structure of tested member 3 and may occur that the information such as crack site determine the emphasis position to be detected of member;
(2) determining of acoustic emission acquisition analysis system 6: determine the number of active lanes of acoustic emission acquisition analysis system 6 and the type of calibrate AE sensor 4 according to factors such as the shape of tested member 3, material, accuracy of detection;
(3) determining of calibrate AE sensor 4 arrangements: according to the arrangement of definite calibrate AE sensors 4 such as the geometric configuration at the position to be detected of tested member 3, volume size;
(4) determining of tested member 3 states: judge that tested member 3 is in static or dynamic; Static state is that the crackle in member remains static, and is dynamically the cracks active state in member;
(5) detection method when tested member 3 is static: a. ultrasonic generator 1 is surface emitting ultrasonic exciting except calibrate AE sensor 4 placement-face in tested member 3 position to be detected, as the simulation signal generator of acoustic emission acquisition analysis system 6; Wherein ultrasonic probe is unidirectional probe, and the parameter of ultrasonic probe number and ultrasonic generator 1 is determined according to detected object;
B. calibrate AE sensor 4 gathers this signal, after prime amplifier 5 amplifies, is sent to acoustic emission acquisition processing system 6; C. acoustic emission acquisition processing system 6 receives signal and signal is carried out to analyzing and processing, obtains the nonlinear characteristic parameters vector of signal; The nonlinear characteristic parameters vector contrast obtaining when d. the nonlinear characteristic parameters obtaining is vectorial and member is intact, judges whether tested member 3 exists the degree of micro-crack and micro-cracks damage;
(6) detection method when tested member 3 is dynamic:
A. directly with calibrate AE sensor 4 Real-time Collections because of the acoustic emission signal of tested member 3 inside because existing micro-crack to inspire; B. after amplifying, prime amplifier 5 is sent to acoustic emission acquisition processing system 6;
C. acoustic emission acquisition processing system 6 receives signal analyzing and processing, obtains the nonlinear characteristic parameters vector of signal;
The nonlinear characteristic parameters vector contrast obtaining when d. the nonlinear characteristic parameters obtaining is vectorial and member is intact, judges whether tested member 3 exists the degree of micro-crack and micro-cracks damage.
CN201410065059.9A 2014-02-26 2014-02-26 Microcrack nondestructive detecting device and method CN103760243A (en)

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CN104485113A (en) * 2014-12-23 2015-04-01 长沙理工大学 Multi-fault-source acoustic emission signal separation method
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CN105181804A (en) * 2015-10-10 2015-12-23 北京工业大学 Dynamic wavelet fingerprint analysis method used for non-linear effect representation of ultrasonic waves
CN105424502A (en) * 2016-01-05 2016-03-23 天津大学 Circumferential weld bending tester for large-deformation pipeline and method thereof
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CN106198383A (en) * 2016-09-13 2016-12-07 上海海事大学 The nondestructive detection system of a kind of small size component top layer microfissure and method
CN106770675A (en) * 2016-12-06 2017-05-31 郑州轻工业学院 Diamond press top hammer crackle online test method based on acoustic emission signal
CN107462599A (en) * 2017-08-21 2017-12-12 长沙学院 A kind of microwave thermal sound detection monitoring system and method
CN107520257A (en) * 2016-06-22 2017-12-29 上海宝钢工业技术服务有限公司 Strip mechanical performance on-line detecting system
CN108226297A (en) * 2018-01-15 2018-06-29 国网江苏省电力公司检修分公司特高压交直流运检中心 A kind of vacuum tube bellows surface crack detecting method based on fiber grating
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CN109187066A (en) * 2018-09-14 2019-01-11 成都格瑞特高压容器有限责任公司 The monitoring method in fatigue test combination Acoustic Emission Evaluation gas cylinder service life
CN111426919A (en) * 2020-04-08 2020-07-17 国网山西省电力公司电力科学研究院 Basin-type insulator detection device based on laser-induced ultrasound

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CN104049038A (en) * 2014-06-19 2014-09-17 中航复合材料有限责任公司 Ultrasonic-acoustic emission detection method for composite material
CN104485113A (en) * 2014-12-23 2015-04-01 长沙理工大学 Multi-fault-source acoustic emission signal separation method
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CN105181804B (en) * 2015-10-10 2018-01-12 北京工业大学 A kind of dynamic small echo fingerprint analysis method characterized for ultrasonic wave nonlinear effect
CN105651863A (en) * 2015-12-29 2016-06-08 中国农业大学 Detection method of bore hole in corn seed
CN105424502A (en) * 2016-01-05 2016-03-23 天津大学 Circumferential weld bending tester for large-deformation pipeline and method thereof
CN105424502B (en) * 2016-01-05 2019-08-20 天津大学 Large deformation pipeline girth weld Apparatus for Bending at low-temp and its method
CN109073605A (en) * 2016-02-03 2018-12-21 奎斯特综合股份有限公司 Method and apparatus for checking pipeline
CN109073605B (en) * 2016-02-03 2021-03-05 奎斯特综合股份有限公司 Method and apparatus for inspecting a pipe
CN107520257A (en) * 2016-06-22 2017-12-29 上海宝钢工业技术服务有限公司 Strip mechanical performance on-line detecting system
CN107520257B (en) * 2016-06-22 2020-07-24 上海宝钢工业技术服务有限公司 On-line detection system for mechanical property of strip steel
CN106198383A (en) * 2016-09-13 2016-12-07 上海海事大学 The nondestructive detection system of a kind of small size component top layer microfissure and method
CN106770675A (en) * 2016-12-06 2017-05-31 郑州轻工业学院 Diamond press top hammer crackle online test method based on acoustic emission signal
CN106770675B (en) * 2016-12-06 2019-05-21 郑州轻工业学院 Diamond press top hammer crackle online test method based on acoustic emission signal
CN107462599A (en) * 2017-08-21 2017-12-12 长沙学院 A kind of microwave thermal sound detection monitoring system and method
CN108344860A (en) * 2017-12-19 2018-07-31 同济大学 The method for characterizing cement-based material surface crack self-healing effect based on healing bulk product
CN108226297A (en) * 2018-01-15 2018-06-29 国网江苏省电力公司检修分公司特高压交直流运检中心 A kind of vacuum tube bellows surface crack detecting method based on fiber grating
CN109187066A (en) * 2018-09-14 2019-01-11 成都格瑞特高压容器有限责任公司 The monitoring method in fatigue test combination Acoustic Emission Evaluation gas cylinder service life
CN111426919A (en) * 2020-04-08 2020-07-17 国网山西省电力公司电力科学研究院 Basin-type insulator detection device based on laser-induced ultrasound

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