CN102636559A - Electromagnetic acoustic emission non-destructive detection method and device of metal material - Google Patents

Electromagnetic acoustic emission non-destructive detection method and device of metal material Download PDF

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CN102636559A
CN102636559A CN2012101121451A CN201210112145A CN102636559A CN 102636559 A CN102636559 A CN 102636559A CN 2012101121451 A CN2012101121451 A CN 2012101121451A CN 201210112145 A CN201210112145 A CN 201210112145A CN 102636559 A CN102636559 A CN 102636559A
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metal material
acoustic emission
piezoelectric transducer
detected
detection method
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张闯
刘素贞
金亮
杨庆新
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Hebei University of Technology
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Hebei University of Technology
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Abstract

The invention discloses an electromagnetic acoustic emission non-destructive detection method and device of a metal material, and relates to metal material testing by utilizing an acoustic wave emission technology. The detection method comprises the following steps of: loading pulse high current generated by a pulse high-current generator to a metal material to be detected, and exciting to generate acoustic emission signals if the metal material to be detected has cracks; detecting the acoustic emission signals by four piezoelectric sensors, inputting the acoustic emission signals into a preposed amplifier through a signal line, amplifying the acoustic emission signals by the preposed amplifier, and inputting into to a PC (personal computer) machine; and carrying out two-dimensional time difference positioning by the PC machine according to the collected acoustic emission signals, and positioning and detecting the cracking defect of the metal material to be detected. The device comprises the pulse high-current generator, four piezoelectric transducers, the preposed amplifier and the PC machine. According to the invention, the defect that the prior art in the metal material detection can lead to secondary destruction of the structure of the metal material to be detected is overcome, the application range of the acoustic emission technology is expanded, the recognition efficiency of the acoustic emission technology is improved, and the electromagnetic acoustic emission non-destructive detection method and device of the metal material are suitable for industrial application.

Description

The electromagnetic sound emission lossless detection method and the device thereof of metal material
Technical field
Technical scheme of the present invention relates to utilizes sound wave emissions technical testing metal material, specifically the electromagnetic sound of metal material emission lossless detection method and device thereof.
Background technology
Along with developing rapidly of modern equipment manufacture, constantly improve the bearing stress level of hardware and equipment, the fracture failure accident of hardware and equipment then often takes place.For essential industry fields such as space flight, electric power, chemical industry, navigation and nuclear energy, the fracture failure accident of hardware and equipment tends to bring immeasurable serious consequence.The traditional device maintaining method need be done regular stop production to overhaul to hardware and equipment, has blindness, brings a lot of inconvenience to production.Generation for the fracture failure accident of preventing hardware and equipment; Require to find as early as possible the dangerous crackle in hardware and the equipment, acoustic emission becomes the important detection method of the dangerous crackle in hardware and the equipment with its high sensitivity and dynamic monitoring characteristic.
CN2270974 discloses acoustic emission detector, is based on acoustic emission the damage of metal material under the moving load condition is detected; CN200610021636.X has disclosed and has utilized acoustic emission that the dynamic defect of load bearing equipment is detected; CN101458158 reported based on the steam turbine plain bearing failure diagnosis method of acoustic emission detection and device thereof, is used for the steam turbine plain bearing fault is detected and diagnoses.Though above-mentioned acoustic emission detection method can realize the dynamic damage of metal material is detected; But its shortcoming mainly contains two: at first, testing conditions is harsh, must apply whole mechanical load to tested metal; Just can inspire acoustic emission phenomenon when defective is in active state, and then realize detecting; Secondly, under the effect that adds mechanical load, extra additional injury appears in metal material easily, makes testing process to being caused secondary damage by geodesic structure.These method and apparatus have greatly limited the range of application of acoustic emission testing technology, are inappropriate for actual commercial Application.
Under the prerequisite that keeps acoustic emission detection method advantage, how to enlarge its range of application and improve its recognition efficiency, to be suitable for actual commercial Application, become important development direction of acoustic emission.
Summary of the invention
Technical matters to be solved by this invention is: electromagnetic sound emission lossless detection method and device thereof that metal material is provided; Be based on the mode that pulse high current directly loads; Realize the nondestructive examination of metal material crack-type defect; Overcome prior art and in the metal material testing process, understood the shortcoming that cause secondary damage to metal structure to be detected, enlarged the acoustic emission range of application and improved its recognition efficiency, and be suitable for actual commercial Application.
The present invention solves this technical problem the technical scheme that is adopted: the electromagnetic sound emission lossless detection method of metal material; Be based on the mode that pulse high current directly loads; The steps include: to draw lead is fixed in metal material to be detected respectively with the plastics clamper two ends, again with four piezoelectric transducer S from two electrodes of the high-voltage capacitance of pulse high current generator 1, S 2, S 3And S 4Four vertex positions by rhombus are placed on this metal material to be detected, and each piezoelectric transducer is connected to prime amplifier through signal wire respectively, and prime amplifier is wired to PC again; The pulse high current generator is connected the alternating current of 220v and produced pulse high current; This pulse high current is loaded on the metal material to be detected; If there is crack-type defect in metal material to be detected, can be inspired acoustic emission signal, this acoustic emission signal is by four piezoelectric sensor S 1, S 2, S 3And S 4Detection is also passed through signal wire input prime amplifier; Amplify acoustic emission signal and import PC by this prime amplifier; This PC carries out two dimension time difference location according to the acoustic emission signal that is collected, thereby detection and localization goes out the crack-type defect that this metal material to be detected exists.
The electromagnetic sound emission lossless detection method of above-mentioned metal material, the peak point current of used pulse high current is at 800～3000 amperes, and pulse width is 150～300 microseconds.
The electromagnetic sound emission lossless detection method of above-mentioned metal material; Said PC carries out two dimension time difference location according to the acoustic emission signal that is collected; Its calculation procedure is: PC is according to the velocity of wave V of the acoustic emission sound wave that sends of metal material to be detected of input, again according to four piezoelectric transducer S 1, S 2, S 3And S 4Coordinate, calculate piezoelectric transducer S 1Probe and piezoelectric transducer S 2Probe spacing be a, piezoelectric transducer S 3Probe and piezoelectric transducer S 4The spacing of probe be b, again according to four piezoelectric sensor S 1, S 2, S 3And S 4The acoustic emission signal sequencing that collects is confirmed piezoelectric transducer S 1With piezoelectric transducer S 3Between collect the time difference Δ t of acoustic emission signal 1, and piezoelectric transducer S 2With piezoelectric transducer S 4Between collect the time difference Δ t of acoustic emission signal 2, and then obtain acoustic emission source, i.e. the coordinate of crack tip position according to following time difference location Calculation formula (1) and (2):
x = Δt 1 V 2 a [ Δt 1 V + 2 ( x - a / 2 ) 2 + y 2 ] - - - ( 1 ) y = Δt 2 V 2 b [ Δt 2 V + 2 ( y - b / 2 ) 2 + x 2 ] - - - ( 2 ) .
The electromagnetic sound of above-mentioned metal material emission lossless detection method, the flow process that said PC carries out the program of two dimension time difference location according to the acoustic emission signal that is collected is: velocity of wave V and four piezoelectric transducer S of importing the acoustic emission sound wave that metal material to be detected sends respectively 1, S 2, S 3And S 4Coordinate → PC according to four piezoelectric transducer S 1, S 2, S 3And S 4Coordinate, calculate piezoelectric transducer S 1Probe and piezoelectric transducer S 3Probe between apart from a, calculate piezoelectric transducer S 2Probe and piezoelectric transducer S 4Probe between distance b → PC arrive the sequencing of piezoelectric sensor according to the acoustic emission signal that collects, confirm piezoelectric transducer S 1With piezoelectric transducer S 3Between gather the time difference Δ t of acoustic emission signal 1, and piezoelectric transducer S 2With piezoelectric transducer S 4Between gather the time difference Δ t of acoustic emission signal 2→ PC calculates the acoustic emission source coordinate according to time difference ranging formula, realizes the location to metal material crack-type defect to be detected.
The used device of electromagnetic sound emission lossless detection method of above-mentioned metal material comprises pulse high current generator, four piezoelectric transducer S 1, S 2, S 3, S 4, prime amplifier and PC, said pulse high current generator is by AC voltage adjusting module K 1, rectifier bridge K 2, have a relay K of a normally closed and normally opened contact 3, high-voltage capacitance C, filter capacitor C 1, sustained diode, metal material self-resistance R to be detected, current-limiting resistance R 1, detect resistance R SWith adjustable potentiometer R 2Connect and compose by following circuit: AC voltage adjusting module K 1Respectively with potentiometer R 2, rectifier bridge K 2Input be connected rectifier bridge K 2Output is via filter capacitor C 1Afterwards, through relay K 3Normally closed contact link to each other relay K with high-voltage capacitance C 3Normally opened contact and sustained diode output terminal and detect resistance R SConnect metal material self-resistance R to be detected and detection resistance R SBe in series, the other end of metal material self-resistance R to be detected connects high-voltage capacitance C; Two electrodes of the high-voltage capacitance C of pulse high current generator are drawn lead is fixed in metal material to be detected respectively with the plastics clamper two ends, again with four piezoelectric transducer S 1, S 2, S 3And S 4Four vertex positions by rhombus are placed on this metal material to be detected four piezoelectric transducer S respectively 1, S 2, S 3And S 4Be connected to prime amplifier through signal wire respectively, prime amplifier is wired to PC.
The used device of the electromagnetic sound of above-mentioned metal material emission lossless detection method, used AC voltage adjusting module K in the said pulse high current generator 1Model be full single phase ac regulation module DTY-H220D15, the rectifier bridge K of isolating 2Model be KBPC5010, have the relay K of a normally closed and normally opened contact 3Be conversion hysteria electromagnetic relay JQX-13F, the rated voltage of high-voltage capacitance C is that 500V and capacity are 2200uF, filter capacitor C 1Rated voltage be that 450V and capacity are 470uF, the model of sustained diode is DSEK2006, the resistance value of metal material self-resistance R to be detected is approximately zero, current-limiting resistance R 1Resistance value be 100 ohm, detect resistance R SResistance value is 3.75 milliohms, adjustable potentiometer R 2Maximum resistance is 5000 ohm.
It is 1.5 square millimeters copper conductor that the used device of the electromagnetic sound of above-mentioned metal material emission lossless detection method, two electrodes of said high-voltage capacitance C are drawn lead.
The used device of electromagnetic sound emission lossless detection method of above-mentioned metal material, said four piezoelectric transducer S 1, S 2, S 3And S 4Be purchased, model is all R15a.
The used device of electromagnetic sound emission lossless detection method of above-mentioned metal material, said prime amplifier is purchased, and is produced by U.S. PAC company, and model is 2/4/6.
The invention has the beneficial effects as follows: the electromagnetic sound emission lossless detection method of metal material of the present invention and the outstanding substantive distinguishing features of device thereof are; Pulse high current is loaded on the metal material to be detected; Receive the influence of the crackle on the metal material to be detected; Electric current forms tangible concentration effect at the crack tip place, causes splitting near the current density of point and sharply increases.Under the effect in magnetic field, the crack tip place produces Lorentz force, and the direction of Lorentz force makes the outwards expansion respectively of crackle both sides, and then inspires acoustic emission phenomenon.Utilize piezoelectric sensor to detect acoustic emission signal and carry out signal Processing and can obtain crack information on the metal material, thereby realize Non-Destructive Testing the metal material crack-type defect with PC.
The marked improvement of the electromagnetic sound of metal material of the present invention emission lossless detection method and device thereof is, 1. the static state at metal material to be detected does not detect with having under the effect that adds mechanical load, and the structure of metal material to be detected is not caused secondary damage; 2. enlarge the range of application of acoustic emission detection method, do not received the restriction of the type and the shape of metal material to be detected; 3. the electromagnetic sound of metal material of the present invention emission lossless detection method is simple to operate, and the building block of its device is simple in structure and cheap.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the present invention is further specified.
Fig. 1 is the operating process schematic block diagram of the electromagnetic sound emission lossless detection method of metal material of the present invention.
Fig. 2 is the formation schematic block diagram of the used device of the electromagnetic sound emission lossless detection method of metal material of the present invention.
Fig. 3 is the circuit theory diagrams of the pulse high current generator in the used device of the electromagnetic sound emission lossless detection method of metal material of the present invention.
Fig. 4 carries out the synoptic diagram of two dimension time difference plane positioning step according to the acoustic emission signal that collects for the PC in the used device of the electromagnetic sound emission lossless detection method of metal material of the present invention.
Fig. 5 carries out the process flow diagram of the program of two dimension time difference location for PC in the used device of the electromagnetic sound emission lossless detection method of metal material of the present invention according to the acoustic emission signal that collects.
Embodiment
Embodiment illustrated in fig. 1 showing, the operating process of the electromagnetic sound emission lossless detection method of metal material of the present invention is: pulse high current is loaded on the metal material to be detected, if there is crack-type defect in metal material to be detected; Can be inspired acoustic emission signal; Detect this acoustic emission signal, transmit acoustic emission signal, detected acoustic emission signal is amplified; Carry amplifying signal, carry out data acquisition and processing and obtain a result.
Embodiment illustrated in fig. 2 showing, the used device of electromagnetic sound emission lossless detection method of metal material of the present invention is made up of pulse high current generator, four piezoelectric transducers, prime amplifier and PCs.
Embodiment illustrated in fig. 3 showing, the electromagnetic sound of metal material of the present invention is launched the circuit of the pulse high current generator in the used device of lossless detection method by AC voltage adjusting module K 1, rectifier bridge K 2, have a relay K of a normally closed and normally opened contact 3, high-voltage capacitance C, filter capacitor C 1, sustained diode, metal material self-resistance R to be detected, current-limiting resistance R 1, detect resistance R SWith adjustable potentiometer R 2Connect and compose by following circuit: AC voltage adjusting module K 1Respectively with potentiometer R 2, rectifier bridge K 2Input be connected rectifier bridge K 2Output is via filter capacitor C 1Afterwards, through relay K 3Normally closed contact link to each other relay K with high-voltage capacitance C 3Normally opened contact and sustained diode output terminal and detect resistance R SConnect metal material self-resistance R to be detected and detection resistance R SBe in series, the other end of metal material self-resistance R to be detected connects high-voltage capacitance C.
This pulse high current generator adopts the final discharge current amplitude of the mode control capacitance of AC voltage adjusting, and the switching of capacitor charge and discharge process is by the conversion hysteria relay K 3Realize, by model be the 12V direct current control that provides of the 12V direct supply of J-1812-A its be in charged state simultaneously, or be in discharge condition simultaneously.High-voltage capacitance C rated voltage is 500V, and capacity is 2200uF, and sustained diode not only can be protected discharging capacitor not receive back-pressure and damage, and also can play the effect of regulating discharge current waveform simultaneously.Resistance R SFor detecting resistance, can draw discharge current through measuring its voltage.K 3For having the relay of a normally closed and normally opened contact, after capacitance voltage reaches predetermined value, K 3Normally closed contact break off K 3Normally opened contact closed, high-voltage capacitance C begins to form a pulse high current to metal material discharge to be detected.Discharge finishes, K 3Normally opened contact break off K 3Normally closed contact closed, high-voltage capacitance C charging is in order to discharge test next time.
PC carries out two dimension time difference location according to the acoustic emission signal that is collected, promptly two-dimentional time difference plane positioning, and its step is as shown in Figure 4: PC is according to four piezoelectric transducer S 1, S 2, S 3And S 4Coordinate, calculate piezoelectric transducer S 1Probe and piezoelectric transducer S 2Probe spacing be a, piezoelectric transducer S 3Probe and piezoelectric transducer S 4The spacing of probe be b, again according to four piezoelectric sensor S 1, S 2, S 3And S 4The acoustic emission signal sequencing that collects is confirmed piezoelectric transducer S 1With piezoelectric transducer S 3Between collect the time difference Δ t of acoustic emission signal 1, and piezoelectric transducer S 2With piezoelectric transducer S 4Between collect the time difference Δ t of acoustic emission signal 2, by piezoelectric transducer S 1With piezoelectric transducer S 3Gather the time difference Δ t of acoustic emission signal 1Obtain hyperbolic curve 1, by piezoelectric transducer S 2With piezoelectric transducer S 4Gather the time difference Δ t of acoustic emission signal 2Obtain hyperbolic curve 2, add the velocity of wave V of PC, draw Coordinate Calculation formula (1) and (2) according to the acoustic emission sound wave that sends of metal material to be detected of input, definite thus acoustic emission source be the crack tip position be located in two hyp intersection point Q (x, y) on.
Embodiment illustrated in fig. 5 showing, the flow process that PC carries out the program of two dimension time difference location according to the acoustic emission signal that collects in the used device of the electromagnetic sound of metal material of the present invention emission lossless detection method is: velocity of wave V and four piezoelectric transducer S of importing the acoustic emission sound wave that metal material to be detected sends respectively 1, S 2, S 3And S 4Coordinate.→ PC is according to four piezoelectric transducer S 1, S 2, S 3And S 4Coordinate, calculate piezoelectric transducer S 1Probe and piezoelectric transducer S 3Probe between apart from a, calculate piezoelectric transducer S 2Probe and piezoelectric transducer S 4Probe between distance b.→ PC is confirmed piezoelectric transducer S according to the sequencing of the acoustic emission signal arrival piezoelectric sensor that collects 1With piezoelectric transducer S 3Between gather the time difference Δ t of acoustic emission signal 1, and piezoelectric transducer S 2With piezoelectric transducer S 4Between gather the time difference Δ t of acoustic emission signal 2→ PC calculates the acoustic emission source coordinate according to time difference ranging formula, realizes the location to metal material crack-type defect to be detected.
The used device of the electromagnetic sound of the metal material among following all embodiment emission lossless detection method be with such as above-mentioned Fig. 2 and described parts of Fig. 3 and components and parts formation, used AC voltage adjusting module K in the wherein said pulse high current generator 1Model be full single phase ac regulation module DTY-H220D15, the rectifier bridge K of isolating 2Model be KBPC5010, have the relay K of a normally closed and normally opened contact 3Be conversion hysteria electromagnetic relay JQX-13F, the rated voltage of high-voltage capacitance C is that 500V and capacity are 2200uF, filter capacitor C 1Rated voltage be that 450V and capacity are 470uF, the model of sustained diode is DSEK2006, the resistance value of metal material self-resistance R to be detected is approximately zero, current-limiting resistance R 1Resistance value be 100 ohm, detect resistance R SResistance value is 3.75 milliohms, adjustable potentiometer R 2Maximum resistance is 5000 ohm.It is 1.5 square millimeters copper conductor that two electrodes of said high-voltage capacitance C are drawn lead.Said four piezoelectric transducer S 1, S 2, S 3And S 4Be purchased, model is all R15a.Said prime amplifier is purchased, and is produced by U.S. PAC company, and model is 2/4/6.The arrangement and the method for attachment of this device are: two electrodes of the high-voltage capacitance C of pulse high current generator are drawn lead is fixed in metal material to be detected respectively with the plastics clamper two ends, again with four piezoelectric transducer S 1, S 2, S 3And S 4Four vertex positions by rhombus are placed on this metal material to be detected four piezoelectric transducer S respectively 1, S 2, S 3And S 4Be connected to prime amplifier through signal wire respectively, this prime amplifier is wired to PC.
Embodiment 1
When beginning to detect; The pulse high current generator is connected the alternating current of 220v; When high-voltage capacitance C charging voltage reached 50V, its maximum discharge current can reach 800A, and pulse width is 220 microseconds; The copper conductor input of this pulse high current through 1.5 square millimeters is loaded on the aluminum metallic material to be detected that is of a size of 500mm * 115mm * 15mm; This aluminum metallic material to be detected is inspired acoustic emission signal, and the piezoelectric sensor that this signal is pressed four the R15a models of position of sound production on this aluminum metallic material to be detected of rhombus detects, and is 2/4/6 prime amplifier through signal wire input U.S. PAC company model; Amplify acoustic emission signal and import PC by this prime amplifier; This PC carries out two dimension time difference location according to the acoustic emission signal that is collected, and its calculation procedure is: the velocity of wave V of the acoustic emission sound wave that PC sends according to the aluminum metallic material to be detected of input, and again according to four piezoelectric transducer S 1, S 2, S 3And S 4Coordinate, calculate piezoelectric transducer S 1Probe and piezoelectric transducer S 2Probe spacing be a, piezoelectric transducer S 3Probe and piezoelectric transducer S 4The spacing of probe be b, again according to four piezoelectric sensor S 1, S 2, S 3And S 4The acoustic emission signal sequencing that collects is confirmed piezoelectric transducer S 1With piezoelectric transducer S 3Between collect the time difference Δ t of acoustic emission signal 1, and piezoelectric transducer S 2With piezoelectric transducer S 4Between collect the time difference Δ t of acoustic emission signal 2, and then obtain acoustic emission source, i.e. the coordinate of crack tip position according to following time difference location Calculation formula (1) and (2):
x = Δt 1 V 2 a [ Δt 1 V + 2 ( x - a / 2 ) 2 + y 2 ] - - - ( 1 ) y = Δt 2 V 2 b [ Δt 2 V + 2 ( y - b / 2 ) 2 + x 2 ] - - - ( 2 ) .
The program circuit that above-mentioned PC carries out two dimension time difference location according to the acoustic emission signal that is collected is: velocity of wave V and four piezoelectric transducer S of importing the acoustic emission sound wave that aluminum metallic material to be detected sends respectively 1, S 2, S 3And S 4Coordinate.→ PC is according to four piezoelectric transducer S 1, S 2, S 3And S 4Coordinate, calculate piezoelectric transducer S 1Probe and piezoelectric transducer S 3Probe between apart from a, calculate piezoelectric transducer S 2Probe and piezoelectric transducer S 4Probe between distance b.→ PC is confirmed piezoelectric transducer S according to the sequencing of the acoustic emission signal arrival piezoelectric sensor that collects 1With piezoelectric transducer S 3Between gather the time difference Δ t of acoustic emission signal 1, and piezoelectric transducer S 2With piezoelectric transducer S 4Between gather the time difference Δ t of acoustic emission signal 2→ PC calculates the acoustic emission source coordinate according to time difference ranging formula, realizes the location to aluminum metallic material crack-type defect to be detected.
Final detection and localization goes out the crack-type defect position that this aluminum metallic material to be detected exists, and positioning error is 2mm.
Embodiment 2
Remove when beginning to detect; The pulse high current generator is connected the alternating current of 220v; When high-voltage capacitance C charging voltage reached 50V, its maximum discharge current can reach 1860A, and pulse width is 250 microseconds; Metal material to be detected is for to be of a size of outside the alloy steel metal material of 500mm * 115mm * 15mm, and other are all with embodiment 1.
Final detection and localization goes out the crack-type defect position that this alloy steel metal material to be detected exists, and positioning error is 1mm.
Embodiment 3
Remove when beginning to detect; The pulse high current generator is connected the alternating current of 220v; When high-voltage capacitance C charging voltage reached 50V, its maximum discharge current can reach 3000A, and pulse width is 300 microseconds; Metal material to be detected is for to be of a size of outside the alloy steel metal material of 500mm * 115mm * 15mm, and other are all with embodiment 1.
Final detection and localization goes out the crack-type defect position that this alloy steel metal material to be detected exists, and positioning error is 1mm.

Claims (7)

1. the electromagnetic sound of metal material is launched lossless detection method; It is characterized in that step is: the electromagnetic sound emission lossless detection method of metal material; The steps include: to draw two leads are fixed in metal material to be detected respectively with the plastics clamper two ends, again with four piezoelectric transducer S from the electrode of the high-voltage capacitance of pulse high current generator 1, S 2, S 3And S 4Four vertex positions by rhombus are placed on this metal material to be detected, and each piezoelectric transducer is connected to prime amplifier through signal wire respectively, and prime amplifier is wired to PC again; The pulse high current generator is connected the alternating current of 220v and produced pulse high current; This pulse high current is loaded on the metal material to be detected; If there is crack-type defect in metal material to be detected, can be inspired acoustic emission signal, this acoustic emission signal is by four piezoelectric sensor S 1, S 2, S 3And S 4Detection is also passed through signal wire input prime amplifier; Amplify acoustic emission signal and import PC by this prime amplifier; This PC carries out two dimension time difference location according to the acoustic emission signal that is collected, thereby detection and localization goes out the crack-type defect that this metal material to be detected exists.
2. according to the electromagnetic sound emission lossless detection method of the said metal material of claim 1, it is characterized in that: the peak point current of used pulse high current is at 800～3000 amperes, and pulse width is 150～300 microseconds.
3. launch lossless detection method according to the electromagnetic sound of the said metal material of claim 1; It is characterized in that: said PC carries out two dimension time difference location according to the acoustic emission signal that is collected; Its calculation procedure is: PC is according to the velocity of wave V of the acoustic emission sound wave that sends of metal material to be detected of input, again according to four piezoelectric transducer S 1, S 2, S 3And S 4Coordinate, calculate piezoelectric transducer S 1Probe and piezoelectric transducer S 2Probe spacing be a, piezoelectric transducer S 3Probe and piezoelectric transducer S 4The spacing of probe be b, again according to four piezoelectric sensor S 1, S 2, S 3And S 4The acoustic emission signal sequencing that collects is confirmed piezoelectric transducer S 1With piezoelectric transducer S 3Between collect the time difference Δ t of acoustic emission signal 1, and piezoelectric transducer S 2With piezoelectric transducer S 4Between collect the time difference Δ t of acoustic emission signal 2, and then obtain acoustic emission source, i.e. the coordinate of crack tip position according to following time difference location Calculation formula (1) and (2):
x = Δt 1 V 2 a [ Δt 1 V + 2 ( x - a / 2 ) 2 + y 2 ] - - - ( 1 ) y = Δt 2 V 2 b [ Δt 2 V + 2 ( y - b / 2 ) 2 + x 2 ] - - - ( 2 ) .
4. according to the electromagnetic sound of the said metal material of claim 1 emission lossless detection method, it is characterized in that: the flow process that said PC carries out the program of two dimension time difference location according to the acoustic emission signal that is collected is: velocity of wave V and four piezoelectric transducer S of importing the acoustic emission sound wave that metal material to be detected sends respectively 1, S 2, S 3And S 4Coordinate → PC according to four piezoelectric transducer S 1, S 2, S 3And S 4Coordinate, calculate piezoelectric transducer S 1Probe and piezoelectric transducer S 3Probe between apart from a, calculate piezoelectric transducer S 2Probe and piezoelectric transducer S 4Probe between distance b → PC arrive the sequencing of piezoelectric sensor according to the acoustic emission signal that collects, confirm piezoelectric transducer S 1With piezoelectric transducer S 3Between gather the time difference Δ t of acoustic emission signal 1, and piezoelectric transducer S 2With piezoelectric transducer S 4Between gather the time difference Δ t of acoustic emission signal 2→ PC calculates the acoustic emission source coordinate according to time difference ranging formula, realizes the location to metal material crack-type defect to be detected.
5. the used device of the electromagnetic sound of the said metal material of claim 1 emission lossless detection method is characterized in that: comprise pulse high current generator, four piezoelectric transducer S 1, S 2, S 3, S 4, prime amplifier and PC.Said pulse high current generator is by AC voltage adjusting module K 1, rectifier bridge K 2, have a relay K of a normally closed and normally opened contact 3, high-voltage capacitance C, filter capacitor C 1, sustained diode, metal material self-resistance R to be detected, current-limiting resistance R 1, detect resistance R SWith adjustable potentiometer R 2Connect and compose by following circuit: AC voltage adjusting module K 1Respectively with potentiometer R 2, rectifier bridge K 2Input be connected rectifier bridge K 2Output is via filter capacitor C 1Afterwards, through relay K 3Normally closed contact link to each other relay K with high-voltage capacitance C 3Normally opened contact and sustained diode output terminal and detect resistance R SConnect metal material self-resistance R to be detected and detection resistance R SBe in series, the other end of metal material self-resistance R to be detected connects high-voltage capacitance C; Draw two leads are fixed in metal material to be detected respectively with the plastics clamper two ends from the electrode of the high-voltage capacitance C of pulse high current generator, again with four piezoelectric transducer S 1, S 2, S 3And S 4Four vertex positions by rhombus are placed on this metal material to be detected four piezoelectric transducer S respectively 1, S 2, S 3And S 4Be connected to prime amplifier through signal wire respectively, prime amplifier is wired to PC.
6. according to the used device of the electromagnetic sound of the said metal material of claim 5 emission lossless detection method, it is characterized in that: used AC voltage adjusting module K in the said pulse high current generator 1Model be full single phase ac regulation module DTY-H220D15, the rectifier bridge K of isolating 2Model be KBPC5010, have the relay K of a normally closed and normally opened contact 3Be conversion hysteria electromagnetic relay JQX-13F, the rated voltage of high-voltage capacitance C is that 500V and capacity are 2200uF, filter capacitor C 1Rated voltage be that 450V and capacity are 470uF, the model of sustained diode is DSEK2006, the resistance value of metal material self-resistance R to be detected is approximately zero, current-limiting resistance R 1Resistance value be 100 ohm, detect resistance R SResistance value is 3.75 milliohms, adjustable potentiometer R 2Maximum resistance is 5000 ohm.
7. according to the used device of the electromagnetic sound of the said metal material of claim 5 emission lossless detection method, it is characterized in that: it is copper conductors of 1.5 square millimeters that the electrode of said high-voltage capacitance C is drawn two leads.
CN2012101121451A 2012-04-17 2012-04-17 Electromagnetic acoustic emission non-destructive detection method and device of metal material Pending CN102636559A (en)

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CN118397721A (en) * 2024-06-27 2024-07-26 长春工程学院 Computer practical training class roll call system based on sound source positioning

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US11656200B2 (en) 2020-06-22 2023-05-23 Jiangyin Tianrun Information Technology Co., Ltd Electromagnetic non-destructive quality testing method, and testing circuit and system therefor
CN118397721A (en) * 2024-06-27 2024-07-26 长春工程学院 Computer practical training class roll call system based on sound source positioning

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Application publication date: 20120815