CN102680580A - Acoustic emission testing device of metal sheet - Google Patents
Acoustic emission testing device of metal sheet Download PDFInfo
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- CN102680580A CN102680580A CN2012101747889A CN201210174788A CN102680580A CN 102680580 A CN102680580 A CN 102680580A CN 2012101747889 A CN2012101747889 A CN 2012101747889A CN 201210174788 A CN201210174788 A CN 201210174788A CN 102680580 A CN102680580 A CN 102680580A
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- acoustic emission
- defect
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- snakelike coil
- coil
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Abstract
The invention relates to an acoustic emission testing device of a metal sheet. The devoce comprises a signal generator, a power amplifying device, an impedance matcher, a snakelike coil and a snakelike-coil-type signal receiving probe, wherein the snakelike coil is used for being capable of exciting an acoustic emission signal at a defect position (the metal sheet made of ferromagnetic material is crack-type surface defect) so as to realize non-destructive detection and estimation on the defect; the snakelike coil is arranged above an important test area which needs to be tested repeatedly; voltage is stimulated through high-frequency high-amplitude pulse sine waves; a high-energy vortex is stimulated on a to-be-tested area through energy-focused simulating voltage; the defect is excited by a magnetostriction force and a lorentz force of the ferromagnetic material to emit the acoustic emission signal so as to realize the non-destructive detection and estimation on the defect; and the acoustic emission testing device can effectively improve the testing capacity of the acoustic emission technology for a movable defect, a local closed defect and microcrack and has good industrial application value.
Description
Technical field
The present invention is a kind of acoustic emission detection method, specifically is exactly that a kind of inflection coil that utilizes encourages acoustic emission signal to carry out the method for nondestructive examination in sheet metal.
Background technology
Development along with manufacturing technology; Require material under high temperature, high pressure, high-speed and high load capacity, good Performance And Reliability to be arranged; This makes that traditional flaw detection is difficult to satisfy detection speed and the detection sensitivity demand that nondestructive examination detects, and acoustic emission becomes effective detection technique of visual plant and main equipment with its high sensitivity and dynamic monitoring characteristic.
How Electromagnetic Testing Technology and acoustic emission are combined,,, become an important research direction to be suitable for actual commercial Application with difficulty and the complexity of handling at the prerequisite decline low signal that keeps the acoustic emission advantage.
Summary of the invention
Technical matters to be solved by this invention is to use the inflection coil to locate to excite acoustic emission signal in defective (the sheet metal crack type surface imperfection of ferromagnetic material), thereby realize the detection to mobile defect, local closed defective and microcrack.The exciting current of inflection coil is from 0 to maximum amplitude, distributes with the form of arithmetic progression, through analyzing acoustic emission signal and without the relation of exciting current defective being judged.
The technical scheme that the present invention adopts is: signal generator (2), power amplifier device (3), impedance matching box, inflection coil (4), inflection coil type probe receiver.
The signal circuit that the control loop that signal generator (2) is made up of a single-chip microcomputer and DDS chip are formed is formed, for the power amplifier device (3) of back provides frequency drive end high-frequency impulse input signal accurately.
Power amplifier device (3) is a D class full-bridge inverting power amplifier, and for transformer at the back provides the low alternating voltage that distorts, the alternating voltage that amplifies through transformer provides energy through impedance matching box for the inflection coil.
Inflection coil (4) is made the inflection coil for using printed-board technology on circuit board, use permanent magnet to improve the acoustic emission effect, on surface of contact, covers the wear-resisting compound substance of one deck.
Inflection coil type probe receiver adopts and the identical structure of inflection coil (4).
Description of drawings
Fig. 1 is an one-piece construction block diagram of the present invention;
Fig. 2 is the signal generator schematic diagram;
Fig. 3 is the power amplifier device after the optimal design;
Fig. 4 is the schematic diagram of inflection coil.
Embodiment
Below in conjunction with instance and accompanying drawing the acoustic emission detection method of inflection coil is made detailed description.
As shown in Figure 1; The alternating current of 220v is exported to power amplifier device (3) through the direct current of overcommutation realization 190v; Is alternating voltage through signal generator (2) power controlling multiplying arrangement (3) with its inversion, after transformer boosts, becomes the input voltage of impedance matching box.The inflection coil is the load of transformer after impedance matching box carries out impedance matching.Be loaded into the sinusoidal voltage that obtains in the resonant tank and on sheet metal, excite eddy current to produce acoustic emission signal through inflection coil (4), inflection coil type probe receiver acquired signal also outputs to prime amplifier, realizes eddy current excitation acoustic emission signal.
As shown in Figure 2, the control signal that after single-chip microcomputer receives, transfers the DDS chip to from the signal of keyboard or computer realizes that stable high-frequency controling signal exports driving power multiplying arrangement (3).
As shown in Figure 3; D class full-bridge inverting power amplifier device through Q1, Q2, Q3 and Q4 alternately to turn on and off the 190V dc inversion be alternating voltage; For transformer at the back provides the low alternating voltage that distorts, the alternating voltage that amplifies through transformer is that inflection coil type probe receiver provides energy through impedance matching box.
As shown in Figure 4, inflection coil type probe receiver is made the inflection coil for using printed-board technology on circuit board, use permanent magnet to improve the acoustic emission effect, on surface of contact, covers the wear-resisting compound substance of one deck.
Claims (4)
1. the acoustic emission detection system of a sheet metal is characterized in that being provided with: signal generator (2), power amplifier device (3), impedance matching box, snakelike coil (4), snakelike coil type probe receiver.
2. according to the acoustic emission detection system of claim 1 sheet metal; Its characteristic also is; The alternating current of 220v is exported to power amplifier device (3) through the direct current of overcommutation realization 190v; Is alternating voltage through signal generator (2) power controlling multiplying arrangement (3) with its inversion, after transformer boosts, becomes the input voltage of impedance matching box; Snakelike coil carries out being the load of transformer after the impedance matching; Be loaded into the sinusoidal voltage that obtains in the snakelike coil and on sheet metal, excite eddy current to produce acoustic emission signal, use snakelike coil acquired signal and output to prime amplifier, realize eddy current excitation acoustic emission signal through snakelike coil (4).
3. the acoustic emission detection system of a kind of sheet metal according to claim 1; Its characteristic also is; The exciting current of the acoustic emission detection method of snakelike coil from starting point to maximum amplitude; Form with arithmetic progression distributes, through analyzing acoustic emission signal and without the relation of exciting current defective being judged.
4. the acoustic emission detection system of a kind of sheet metal according to claim 1; Its characteristic also is; A D class full-bridge inverting power amplifier device is an alternating voltage through sharp the shutoff the 190V dc inversion of alternately opening of Q1, Q2, Q3 and Q4; For the transformer of back provides the alternating voltage of low distortion, the alternating voltage that amplifies through transformer is that the acoustic emission detection method of snakelike coil provides energy through impedance matching box.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101747889A CN102680580A (en) | 2012-05-30 | 2012-05-30 | Acoustic emission testing device of metal sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101747889A CN102680580A (en) | 2012-05-30 | 2012-05-30 | Acoustic emission testing device of metal sheet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102680580A true CN102680580A (en) | 2012-09-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012101747889A Pending CN102680580A (en) | 2012-05-30 | 2012-05-30 | Acoustic emission testing device of metal sheet |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102680580A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107607624A (en) * | 2017-09-12 | 2018-01-19 | 北京工业大学 | It is adapted to the acoustic emission detection system and method for high frequency motion surface of friction pair |
-
2012
- 2012-05-30 CN CN2012101747889A patent/CN102680580A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107607624A (en) * | 2017-09-12 | 2018-01-19 | 北京工业大学 | It is adapted to the acoustic emission detection system and method for high frequency motion surface of friction pair |
| WO2019051896A1 (en) * | 2017-09-12 | 2019-03-21 | 北京工业大学 | Acoustic emission testing device and method adapted to surface of friction pair moving at high frequency |
| US10859535B2 (en) | 2017-09-12 | 2020-12-08 | Beijing University Of Technology | Detecting device and method for acoustic emission on high-frequency motion rubbing pair surface |
| CN107607624B (en) * | 2017-09-12 | 2021-03-02 | 北京工业大学 | Acoustic emission detection device and method adaptive to surface of high-frequency motion friction pair |
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Legal Events
| Date | Code | Title | Description |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20120919 |