CN106706760A - Acoustic emission source positioning method of composite material plate of omnidirectional dual circular array - Google Patents
Acoustic emission source positioning method of composite material plate of omnidirectional dual circular array Download PDFInfo
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- CN106706760A CN106706760A CN201611187210.1A CN201611187210A CN106706760A CN 106706760 A CN106706760 A CN 106706760A CN 201611187210 A CN201611187210 A CN 201611187210A CN 106706760 A CN106706760 A CN 106706760A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/14—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object using acoustic emission techniques
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/023—Solids
- G01N2291/0231—Composite or layered materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/023—Solids
- G01N2291/0237—Thin materials, e.g. paper, membranes, thin films
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- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
Abstract
The invention discloses an acoustic emission source positioning method of a composite material plate of an omnidirectional dual circular array. The method comprises the following steps: adopting a dual acoustic emission sensor circular array and the radius of a known circular array, namely the distance between every two sensors, to solve a wave velocity by using a time difference of arrival of the two sensors; and performing verification on solved multiple groups of wave velocity arrays and an omnidirectional experimental result of a solved 360-degree wave velocity, selecting nearest velocities, matching the nearest velocities with corresponding directions, performing gradual deletion to reduce the range of a detection area, repeating the experiment, and finally achieving accurate regional positioning of an acoustic emission source of a structural damage of the composite material plate.
Description
Technical field
The invention belongs to sound emission technical field of nondestructive testing, more particularly to a kind of answering based on omni-directional Double Circle array
Condensation material plate acoustic emission source locating method.
Technical background
Hardened structure applies quite varied structure member, progress of its detection means also with science and technology in practice as engineering
Go deep into more and more diversified with people's research work.The method for carrying out Non-Destructive Testing for large panel construction mainly has vortex
Method, supersonic testing method, acoustic emission detection method, thermal imaging method, fiber laser arrays method, Computer tomography detection method, microwave detection
More than the 10 kinds of method such as method, osmosis, laser hologram detection method.Different detection methods has the advantages that different and limitation：Whirlpool
Stream detection method can realize non-contact detecting, but be only applicable to the conductive material of energy；Ultrasonic wave can not only be detected in tabular component
The detection of the aspects such as the position of defect and size, layering, fiber-wall-element model for composite panel also has certain effect, but needs
Point by point scanning is carried out to structure, detection efficiency is low；Sound-ultrasonic method is suitable to material integrity assessment, but to single, dispersion defect not
Sensitivity, signal is difficult with noise to be distinguished；But thermal imaging method can provide full field image require that test specimen top layer needs preferable heat
Absorptivity.And sound emission (Acoustic Emission, abbreviation AE) to be material or parts be deformed by external force effect, broken
Split or internal stress exceedes yield limit and enters irreversible plastic period, strain energy is discharged in Elastic wave form
Phenomenon.Acoustic emission is a kind of Dynamic Non-Destruction Measurement of passive measurement formula, the conventional lossless detection method phase with ultrasound etc.
Than with three big advantages：(1) acoustic emission signal comes from measurand in itself, therefore, it is possible to realize existing in real time to measurand
Line is monitored；(2) acoustic emission broad covered area, for large-scale component, it is not necessary to which movable sensor carries out scanning to structure, only needs
Arrange the monitoring that sufficient amount of sensor can just be realized to large-scale component；(3) wide application, almost all of material
Can be carried out acoustic emission detection.Using acoustic emission, acoustic emission source present in structure is studied, realized to hardened
The assessment of the health status of the Position Research of acoustic emission source and entirety in structure.
Acoustic emission source positioning is a highly important application in acoustic emission, and current time difference positioning method is sound emission
The main method of source positioning, mainly carries out the mathematical operation of complexity by parameters such as the time difference, velocity of wave and sensor spacing, so that
Determine the position of acoustic emission source, be a kind of more accurate but positioning method of complexity, be widely used in large-scale tabular component or big
The detection of type container.However, positioning using TDOA substantial amounts of low amplitude signal easy to lose, positioning precision is easily by velocity of wave, decay and waveform
Etc. the influence of many reference amounts, particularly in composite structure, due to the anisotropy of material, acoustic emission signal is in different directions
The speed of upper propagation is not quite similar, therefore often more difficult carries out the accurate of acoustic emission source to composite panel by time-of-arrival loaction
Positioning.
The content of the invention
The purpose of the present invention：The main method of current acoustic emission source positioning is time difference positioning method, in composite structure
In, due to the anisotropy of material, the speed that acoustic emission signal is propagated in different directions is not quite similar, therefore, using the time difference
Method carries out being accurately positioned for acoustic emission source to composite panel needs the ripple for solving to cause due to the anisotropy of composite to pass
The anisotropic problem broadcast.The present invention proposes a kind of composite wood of the omni-directional Double Circle array based on velocity of wave for this problem
Flitch acoustic emission source locating method.
To achieve the above object, the present invention is adopted the following technical scheme that：
A kind of composite panel acoustic emission source locating method of omni-directional Double Circle array is comprised the following steps：
Step one：Two acoustic emission sensor arrays of circle, the circle are arranged in composite panel to be measured
Row are one acoustic emission sensor of arrangement on the center of circle, are evenly arranged several voice sending sensors on circular arc counterclockwise
Device, two positions of circular sensor array can arbitrarily arrange that its array pitch is as far as possible；
Step 2：Acoustic emission sensor is connected by preamplifier with the acoustic emission detection instrument for being connected with computer
Connect；
Step 3：Switch on power, and parameter setting, Ran Hou are carried out to each passage on acoustic emission signal acquisition instrument
Disconnected lead experiment is carried out on composite panel to be measured, whether the waveform that each passage of observation shows is normal, and data are carried out if normal
Collection；
Step 4：Assuming that the constant airspeed of acoustic emission wave, calculates each sensor and sensor on the center of circle on circular arc respectively
Acoustic emission signal spread speed between the two, result of calculation is verified with 360 ° of omni-directional experimental results of velocity of wave, selected
The corresponding position of approximation is matching, the phase of the ripple arrival direction of the acoustic emission signal matched in two circular array
Region is handed over, as the first main region residing for acoustic emission source；
Step 5：According to the detection main region for reducing, multiple sensors are rearranged, repeat to test, further determine that sound
In the main region of emission source first second or the 3rd subregion so as to segment main region, delimit positioning region；
Step 6：The acoustic emission source regional location of determination is the sound of matching in last two sensor arrays for rearranging
The intersecting area of the arrival direction of the ripple of transmission signal.
Preferably, step 4 is specially：The distance between sensor on each sensor and the center of circle on circular arc is Δ
L, it is Δ t to be set to up to two reaching time-differences of the acoustic emission wave of sensor, then the speed that acoustic emission wave is propagated in the direction can
Calculated by following formula：
It is bent according to the omni-directional that the acoustic emission signal drawn is propagated in the composite panel in all directions in the range of 360 °
Line, by arranging multigroup sensor array, the relative angle in bonded composite plate between acoustic emission source and sensor array
Relation, and determine the position of the first main region of acoustic emission source.
The present invention proposes a kind of composite panel acoustic emission source locating method based on omni-directional Double Circle array, using vacation
If the thought of inspection, 360 ° of omniranges to acoustic emission signal velocity of wave are scanned.Assuming that velocity of wave is constant in composite panel
, the omni-directional experimental result of the 360 ° of velocities of wave obtained a result and obtain is tested checking, choose immediate speed and with
Corresponding direction matched, progressively delete to reduce the scope of detection zone, repeat to test, finally realize to composite
The accurate zone location of acoustic emission source of dash-board injury.
Brief description of the drawings
Fig. 1 is the manually disconnected lead experiment schematic diagram of composite panel acoustic emission source locating method of the present invention；
Fig. 2 is scan mode and sensing station schematic diagram in the range of 360 ° of acoustic emission sensor；
Fig. 3 is that omni-directional of the acoustic emission signal in the composite panel in the range of 360 ° in all directions with spread speed is bent
Line；
Fig. 4 is the intersecting area of the arrival direction of the ripple of the acoustic emission signal of matching in two circular array, i.e. sound emission
First main region in source；
Fig. 5 is the intersection of the arrival direction of the ripple of the acoustic emission signal of matching in last two sensor arrays arranged
The positioning region in domain, i.e. acoustic emission source；
Label is described as follows in figure：The position of 1- manual simulation's acoustic emission sources, 2- circle acoustic emission sensor arrays, before 3-
Put amplifier, 4- carbon fibre reinforced composite plates, 5- acoustic emission signal detectors, 6- computers, 7- manual simulation's sound emissions
The position in source, 360 ° of scan modes of 8- acoustic emission sensors, 9- acoustic emission sensors, the first main region of 10- acoustic emission sources,
The positioning region of the acoustic emission source that 11- finally determines, the acoustic emission sensor array that 12- finally resets.
Specific embodiment
With reference to following description, detailed exemplary implementation description will be carried out to the present invention.
The embodiment of the present invention provides a kind of composite panel acoustic emission source locating method based on omni-directional Double Circle array,
Mainly using the thought of hypothesis testing carries out the location matches of acoustic emission signal, the accurate zone location for determining acoustic emission source,
Belong to technical field of nondestructive testing.Its step is：
First, two acoustic emission sensor arrays of circle are arranged in composite panel to be measured, i.e., arranges one on the center of circle
Individual acoustic emission sensor, is evenly arranged several acoustic emission sensors, two circular sensor battle arrays counterclockwise on circular arc
The position of row can arbitrarily arrange that its array pitch is as far as possible；
2nd, acoustic emission sensor is connected by preamplifier with the acoustic emission detector for being connected with computer；
3rd, switch on power, each passage to acoustic emission signal Acquisition Instrument carries out parameter setting, be then combined in be measured
Disconnected lead experiment is carried out in plate of material, whether the waveform that each passage of observation shows is normal, and data acquisition is carried out if normal；
4th, assume the constant airspeed of acoustic emission wave, both sensors on each sensor and the center of circle are calculated on circular arc respectively
Between acoustic emission signal spread speed, result of calculation verified with 360 ° of omni-directional experimental results of velocity of wave, is selected approximate
The corresponding position of value is matching, the intersection of the ripple arrival direction of the acoustic emission signal matched in two circular array
Domain, as the first main region residing for sound source；
5th, according to the detection main region for reducing, multiple sensors are rearranged, repeats to test, further determine that the first master
In region second or the 3rd subregion so as to segment main region, delimit positioning region；
6th, the acoustic emission source regional location for determining is the sound emission of matching in last two sensor arrays for rearranging
The intersecting area of the ripple arrival direction of signal.
As shown in the disconnected lead experiment schematic diagrames of Fig. 1, the Orthotropic Composite plate with different ply sequences is as to be checked
Geodesic structure, totally 16 layers, a width of 1000mm × 1000mm of length, total thickness is 2.24mm, and sound emission is simulated by the way of artificial disconnected lead
Source.
Specific implementation step combination schematic diagram is described as follows：
First, as shown in Fig. 2 arranging that a sound emission is passed on arrangement two circular acoustic emission sensor array, the i.e. center of circle
Sensor, is evenly arranged eight acoustic emission sensors counterclockwise on circular arc, each circular array totally nine voice sending sensors
Device.Two positions of circular sensor array are along its length or width arranges that its array pitch is as far as possible；
Secondly, it is assumed that the constant airspeed of acoustic emission wave, both each sensor and center of circle sensor on circular arc are calculated respectively
Between acoustic emission signal spread speed, scan mode and sensor in the range of 360 ° of result of calculation and Fig. 2 acoustic emission sensors
Acoustic emission signal measured by position view is complete with spread speed in all directions in the range of 360 ° in the composite panel
Result shown in tropism curve map 3 verified, it is matching to select the corresponding position of approximation, two circular array
The intersecting area of the arrival direction of the ripple of the acoustic emission signal of middle matching, as the first main region residing for acoustic emission source, such as Fig. 4
It is shown；
It is specific as follows：The distance between sensor on each sensor and the center of circle on circular arc is Δ L, is set to up to two
The reaching time-difference of the acoustic emission wave of sensor is Δ t, then can be by formulaAcoustic emission wave is calculated to pass in the direction
The speed broadcast, it is bent according to the omni-directional that the acoustic emission signal drawn is propagated in the composite panel in all directions in the range of 360 °
Line, by arranging multigroup sensor array, the relative angle in bonded composite plate between acoustic emission source and sensor array
Relation, and determine the position of the first main region of acoustic emission source, as shown in Figure 4；
Finally, according to the detection main region for reducing, multiple sensors are rearranged, applies recommending arrangement seven in the present invention
Sensor carries out repeating experiment, further determine that in main region second or the 3rd subregion so as to segment main region, it is accurate to delimit
Positioning region, i.e., the intersection of the arrival direction of the ripple of the acoustic emission signal matched in two sensor arrays of last arrangement
Domain, as shown in Figure 5.
Claims (2)
1. a kind of composite panel acoustic emission source locating method of omni-directional Double Circle array, it is characterised in that including following step
Suddenly：
Step one：Two acoustic emission sensor arrays of circle are arranged in composite panel to be measured, the circular array is equal
To arrange an acoustic emission sensor on the center of circle, several acoustic emission sensors, two are evenly arranged on circular arc counterclockwise
The position of individual circular sensor array can arbitrarily arrange that its array pitch is as far as possible；
Step 2：Acoustic emission sensor is connected by preamplifier with the acoustic emission detection instrument for being connected with computer；
Step 3：Switch on power, and parameter setting is carried out to each passage on acoustic emission signal acquisition instrument, then to be measured
Composite panel on carry out disconnected lead experiment, whether normal, data acquisition is carried out if normally if observing the waveform that each passage show；
Step 4：Assuming that the constant airspeed of acoustic emission wave, both each sensor and sensor on the center of circle on circular arc are calculated respectively
Between acoustic emission signal spread speed, result of calculation verified with 360 ° of omni-directional experimental results of velocity of wave, is selected approximate
The corresponding position of value is matching, the intersection of the ripple arrival direction of the acoustic emission signal matched in two circular array
Domain, as the first main region residing for acoustic emission source；
Step 5：According to the detection main region for reducing, multiple sensors are rearranged, repeat to test, further determine that sound emission
In the main region of source first second or the 3rd subregion so as to segment main region, delimit positioning region；
Step 6：The acoustic emission source regional location of determination is the sound emission of matching in last two sensor arrays for rearranging
The intersecting area of the arrival direction of the ripple of signal.
2. the composite panel acoustic emission source locating method of omni-directional Double Circle array as claimed in claim 1, its feature exists
In step 4 is specially：The distance between sensor on each sensor and the center of circle on circular arc is Δ L, is set to up to two biographies
The reaching time-difference of the acoustic emission wave of sensor is Δ t, then the speed that acoustic emission wave is propagated in the direction can be calculated by following formula：
According to omnidirectional's linearity curve that the acoustic emission signal drawn is propagated in the composite panel in all directions in the range of 360 °, lead to
Cross and arrange multigroup sensor array, the relative angular relationship in bonded composite plate between acoustic emission source and sensor array,
And determine the position of the first main region of acoustic emission source.
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Cited By (8)
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| CN108072699A (en) * | 2017-12-06 | 2018-05-25 | 中国石油化工股份有限公司 | A kind of Acoustic Emission location detection method based on sound and vibration technology |
| CN108195940A (en) * | 2017-12-28 | 2018-06-22 | 中国特种设备检测研究院 | A kind of Optical Fibre Acoustic Emission Sensor array apparatus and mechanical crackle evolution monitoring technology |
| CN108519583A (en) * | 2018-04-11 | 2018-09-11 | 吉林大学 | Acoustic emission source locating method suitable for anisotropy two dimensional panel |
| CN109187763A (en) * | 2018-09-17 | 2019-01-11 | 山东建筑大学 | A method of acoustic emission source is positioned based on four sensor arrays |
| CN113533531A (en) * | 2021-07-12 | 2021-10-22 | 北京航空航天大学 | Material damage positioning device, positioning method and verification method |
| CN114136556A (en) * | 2021-11-30 | 2022-03-04 | 北京卫星环境工程研究所 | Spacecraft composite structure leakage positioning method based on wave velocity correction |
| CN114235971A (en) * | 2021-12-22 | 2022-03-25 | 大连海事大学 | Ultrasonic guided wave-based method for identifying damaged shape of woven composite material plate |
| CN114675233A (en) * | 2022-02-18 | 2022-06-28 | 西北工业大学太仓长三角研究院 | Acoustic emission source positioning method based on enhanced guided wave phased array technology |
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| CN108072699A (en) * | 2017-12-06 | 2018-05-25 | 中国石油化工股份有限公司 | A kind of Acoustic Emission location detection method based on sound and vibration technology |
| CN108195940A (en) * | 2017-12-28 | 2018-06-22 | 中国特种设备检测研究院 | A kind of Optical Fibre Acoustic Emission Sensor array apparatus and mechanical crackle evolution monitoring technology |
| CN108519583A (en) * | 2018-04-11 | 2018-09-11 | 吉林大学 | Acoustic emission source locating method suitable for anisotropy two dimensional panel |
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| CN109187763B (en) * | 2018-09-17 | 2021-04-09 | 山东建筑大学 | Method for positioning acoustic emission source based on four-sensor array |
| CN113533531A (en) * | 2021-07-12 | 2021-10-22 | 北京航空航天大学 | Material damage positioning device, positioning method and verification method |
| CN114136556A (en) * | 2021-11-30 | 2022-03-04 | 北京卫星环境工程研究所 | Spacecraft composite structure leakage positioning method based on wave velocity correction |
| CN114136556B (en) * | 2021-11-30 | 2024-03-08 | 北京卫星环境工程研究所 | Spacecraft composite structure leakage positioning method based on wave velocity correction |
| CN114235971A (en) * | 2021-12-22 | 2022-03-25 | 大连海事大学 | Ultrasonic guided wave-based method for identifying damaged shape of woven composite material plate |
| CN114235971B (en) * | 2021-12-22 | 2024-02-20 | 大连海事大学 | Ultrasonic guided wave-based braided composite material plate damage shape recognition method |
| CN114675233A (en) * | 2022-02-18 | 2022-06-28 | 西北工业大学太仓长三角研究院 | Acoustic emission source positioning method based on enhanced guided wave phased array technology |
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