CN108918668A - Composite material ellipse damage reason location detection method based on public circumcircle - Google Patents
Composite material ellipse damage reason location detection method based on public circumcircle Download PDFInfo
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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
- G01N29/04—Analysing solids
- G01N29/041—Analysing solids on the surface of the material, e.g. using Lamb, Rayleigh or shear waves
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
Composite material ellipse damage reason location detection method based on public circumcircle, the detection device that the detection method uses includes a square monitoring region being made of four piezoelectric transducers, and single piezoelectric transducer is set as excitation piezoelectric patches in center, remaining four piezoelectric transducer is detected as piezoelectric patches is received by the damage reason location detection method.The invention is using form square monitoring region and piezoelectric patches is motivated to combine, and it is combined using public circumcircle with ellipse positioning, according to damage intersecting point coordinate, public circumcircle fitting is carried out with least square method, it can determine damage position and degree of injury according to the central coordinate of circle of public circumscribed fitting circle and diameter information, compensating for conventional elliptical positioning mode can only be positioned merely, the shortcomings that can not carrying out degree of injury assessment, provides a kind of simple and fast method for the judgement of degree of injury.
Description
Technical field
The invention belongs to technical field of nondestructive testing, specifically more particularly to a kind of composite wood based on public circumcircle
Expect oval damage reason location detection method.
Background technique
Lamb wave is a kind of elastic guided wave transmitted in the solid panel or layer structure with free boundary, due to it
The propagation characteristic of body such as decays along propagation path small, and energy loss is small, and long transmission distance etc. becomes existing field of non destructive testing
The important means of research.Composite material exists at present since it has the characteristics that specific strength is high, specific stiffness is high, corrosion-resistant, antifatigue
The aircraft of aerospace field is largely used.But composite airplane component easily generates during manufacture and military service
The internal tiny flaw such as layering and crackle, in order to meet aircraft industry high quality product, high reliability, high-performance and long-life
It is required that, it is necessary to comprehensive detection is carried out to composite airplane component.For being manufactured by carbon fiber enhancement resin base composite material
Aerospace structure, Lamb wave application it is more universal.
Such as oval location technology of traditional damage detecting method mainly constitutes ellipse according to damage characteristic signal, and passes through song
The mode of line intersection point carries out the positioning of structural damage, and positioning accuracy is directly proportional to number of sensors and signal processing precision, and
And this method is simple positioning, the continuous improvement with Practical Project to technical requirements, to the qualitative assessment of degree of injury
It is imperative that technology study.
Summary of the invention
The purpose of the invention is to realize to carry out positioning and degree of injury assessment to damage of composite materials, positioning is improved
Precision proposes a kind of composite material ellipse position finding and detection method based on public circumcircle.
To achieve the goals above, technical solution provided by the invention is：
Composite material ellipse damage reason location detection method based on public circumcircle, the detection device which uses
Including a square monitoring region being made of four piezoelectric transducers, and in center, single piezoelectric type sensing is set
Device is as excitation piezoelectric patches, remaining four piezoelectric transducer is as reception piezoelectric patches；The damage reason location detection method include with
Lower step：
1) using the center of composite panel to be detected as origin, rectangular coordinate system is established, excitation piezoelectric patches is located at origin,
Four reception piezoelectric patches constitute monitoring region, and center is overlapped with origin, and the centre coordinate of each piezoelectric patches is recorded as (xi,yi),
Wherein i is the number of each piezoelectric patches, and the label of piezoelectric patches is motivated to be denoted as 0, and the label number for receiving piezoelectric patches is respectively 1,2,3,4；
2) when testing, signal excitation is applied to excitation piezoelectric patches, first under the lossless health status of composite panel, successively
The signal for acquiring and collecting each reception piezoelectric patches feedback, is recorded asThen under composite panel faulted condition, successively acquire
And the signal of each reception piezoelectric patches feedback is collected, it is recorded asAnd before and after composite material dash-board injury, other test conditions are constant,
Wherein, it is to the pumping signal u (t) of excitation piezoelectric patches application：
U (t)=A [H (t)-H (t-n/fc)](1-cos(2πfct/n))sin2πfct
Wherein, H (t) is Heaviside step function,
A is that the amplitude of signal is modulated,
fcFor signal center frequency,
N is signal wave crest number；
3) to the collected health signal of each reception piezoelectric patchesAnd damage signalCarry out difference signal analysis；
4) the damage characteristic signal and signal direct wave in difference signal are found out, according to signal envelope find out its it is corresponding when
Between, it is denoted as T respectivelyi(i=1,2,3,4), Tj(i=1,2,3,4) available signal is in two paths：Motivate piezoelectric patches → damage
Hurt position → reception piezoelectric patches, motivate the time difference Δ t=T propagated in piezoelectric patches → reception piezoelectric patchesi-Tj；
5) it with the coordinate of each piezoelectric transducer and the time difference parameter and signal velocity of combination step 4), substitutes into and calculates
Elliptical orbit is constructed in method formula, algorithmic formula is：
Wherein, υ is Lamb wave velocity of wave,
dmnIt is that signal arrives the flight time for receiving piezoelectric patches by damage reflection again,
(x, y) is damage coordinate, (xm,ym) it is excitation piezoelectric patches coordinate, (xn,yn) it is to receive piezoelectric patches coordinate；
6) four elliptical orbits are constructed according to four reception piezoelectric patches, finds out intersecting point coordinate, and with intersection point discreteness sieve
Select damage intersection point.
7) according to gained intersecting point coordinate data in step 6), circumcircle fitting, the fitting circle are carried out according to least square method
It is tangent with four ellipses of building；
8) central coordinate of circle information and diameter information are obtained according to public circumscribed fitting circle, determines damage position, and
Carry out the assessment of degree of injury.
The piezoelectric transducer uses circular piezoelectric ceramic piece, and each piezoelectric ceramic piece parameter is identical.
Composite material ellipse damage reason location detection method provided by the invention based on public circumcircle is supervised using square
The form surveyed region and piezoelectric patches is motivated to combine, and combined using public circumcircle with ellipse positioning, it is sat according to damage intersection point
Mark carries out public circumcircle fitting with least square method, according to the central coordinate of circle and diameter information of public circumscribed fitting circle
It can determine damage position and degree of injury, compensating for conventional elliptical positioning mode can only be positioned merely, can not be damaged
The shortcomings that scale evaluation, provides a kind of simple and fast method for the judgement of degree of injury.
Specific embodiment
Detailed description of the preferred embodiments below.It should be understood that described herein specific
Embodiment is merely illustrative and explains the present invention, is not intended to restrict the invention.
In the present invention, the composite material ellipse damage reason location detection method based on public circumcircle, the detection method is used
Detection device include being made of to be square damage monitoring region and by single piezoelectric sensing four reception piezoelectric transducers
The excitation piezoelectric patches that device is constituted, and motivate piezoelectric patches set on the center in square damage monitoring region, remaining four piezoelectricity
Formula sensor is as reception piezoelectric patches.The present invention uses that detection method includes the following steps：
1) using the center of composite panel to be detected as origin, rectangular coordinate system is established, excitation piezoelectric patches is located at origin,
Four reception piezoelectric patches constitute monitoring region, and center is overlapped with origin, and the centre coordinate of each piezoelectric patches is recorded as (xi,yi),
Wherein i is the number of each piezoelectric patches, and the label of piezoelectric patches is motivated to be denoted as 0, and the label number for receiving piezoelectric patches is respectively 1,2,3,4；
2) when testing, signal excitation is applied to excitation piezoelectric patches, first under the lossless health status of composite panel, successively
The signal for acquiring and collecting each reception piezoelectric patches feedback, is recorded asThen under composite panel faulted condition, successively acquire
And the signal of each reception piezoelectric patches feedback is collected, it is recorded asAnd before and after composite material dash-board injury, other test conditions are constant,
Wherein, it is to the pumping signal u (t) of excitation piezoelectric patches application：
U (t)=A [H (t)-H (t-n/fc)](1-cos(2πfct/n))sin2πfct
Wherein, H (t) is Heaviside step function, and A is that the amplitude of signal is modulated, fcFor signal center frequency, n is letter
Number wave crest number；
3) the collected health signal that each reception piezoelectric patches is receivedAnd damage signalCarry out difference signal analysis；
4) the damage characteristic signal and signal direct wave in difference signal are found out, according to signal envelope find out its it is corresponding when
Between, it is denoted as T respectivelyi(i=1,2,3,4), Tj(i=1,2,3,4) available signal is in two paths：That is damage characteristic signal
By excitation piezoelectric patches → damage position → reception piezoelectric patches, signal direct wave by propagating in excitation piezoelectric patches → reception piezoelectric patches
Time difference Δ t=Ti-Tj；
5) it with the coordinate of each piezoelectric transducer and the time difference parameter and signal velocity of combination step 4), substitutes into and calculates
Elliptical orbit is constructed in method formula, algorithmic formula is：
Wherein, v is Lamb wave velocity of wave, dmnIt is that signal reflects the flight time for arriving receiver piezoelectric patches again by damage, (x,
Y), (xm,ym), (xn,yn) it is divided into damage coordinate, piezoelectric patches coordinate is motivated, piezoelectric patches coordinate is received；
6) four elliptical orbits are constructed according to four reception piezoelectric patches, finds out intersecting point coordinate, and with intersection point discreteness sieve
Select damage intersection point；
7) according to gained intersecting point coordinate data in step 6), circumcircle fitting, the fitting circle are carried out according to least square method
It is tangent with four ellipses of building；
8) central coordinate of circle information and diameter information are obtained according to public circumscribed fitting circle, determines damage position, and
Carry out the assessment of degree of injury.
The invention discloses the composite material ellipse damage reason location detection methods based on public circumcircle, firstly, design pressure
Electric chip arrays, by the square composition damage monitoring region of piezoelectric transducer；Secondly, under health status, it is multiple to being bonded in
Excitation piezoelectric patches on condensation material plate applies excitation, and the response signal for receiving piezoelectric patches feedback to four is acquired respectively；Again
Secondary, under faulted condition, the response signal for receiving piezoelectric patches feedback to four is acquired, and respectively to health status and damage
The signal of state carries out difference signal processing, and finds out its damage characteristic signal and direct-path signal and its corresponding time, calculates
Its time difference out；Then, according to processing data, signal velocity, elliptical building is carried out according to oval positioning principle, and count
Calculate four elliptical damage intersecting point coordinates；Finally, it is quasi- to carry out public circumcircle with least square method according to damage intersecting point coordinate
It closes, damage position and degree of injury can determine according to the central coordinate of circle of public circumscribed fitting circle and diameter information.
Composite material ellipse damage reason location detection method provided by the invention based on public circumcircle is supervised using square
The form surveyed region and piezoelectric patches is motivated to combine, and combined using public circumcircle with ellipse positioning, compensate for conventional elliptical
The shortcomings that positioning mode can only be positioned merely, and degree of injury assessment can not be carried out, provides one kind for the judgement of degree of injury
Simple and fast method.
The above-described embodiments merely illustrate the principles and effects of the present invention, and is not intended to limit the present invention.It is any ripe
The personage for knowing this technology all without departing from the spirit and scope of the present invention, carries out modifications and changes to above-described embodiment.Cause
This, institute is complete without departing from the spirit and technical ideas disclosed in the present invention by those of ordinary skill in the art such as
At all equivalent modifications or change, should be covered by the claims of the present invention.
Claims (2)
1. the composite material ellipse damage reason location detection method based on public circumcircle, it is characterised in that：The detection method uses
Detection device include be made of four piezoelectric transducers one square monitoring region, and it is single in center setting
Piezoelectric transducer is as excitation piezoelectric patches, remaining four piezoelectric transducer is as reception piezoelectric patches；Damage reason location detection
Method includes the following steps：
1) using the center of composite panel to be detected as origin, rectangular coordinate system is established, excitation piezoelectric patches is located at origin, and four
It receives piezoelectric patches and constitutes monitoring region, center is overlapped with origin, and the centre coordinate of each piezoelectric patches is recorded as (xi,yi), wherein
I is the number of each piezoelectric patches, and the label of piezoelectric patches is motivated to be denoted as 0, and the label number for receiving piezoelectric patches is respectively 1,2,3,4；
2) when testing, signal excitation is applied to excitation piezoelectric patches, first under the lossless health status of composite panel, is successively acquired
And the signal of each reception piezoelectric patches feedback is collected, it is recorded asThen under composite panel faulted condition, successively acquires and receive
The signal for collecting each reception piezoelectric patches feedback, is recorded asAnd before and after composite material dash-board injury, other test conditions are constant, wherein
It is to the pumping signal u (t) for motivating piezoelectric patches to apply：
U (t)=A [H (t)-H (t-n/fc)](1-cos(2πfct/n))sin2πfct
Wherein, H (t) is Heaviside step function,
A is that the amplitude of signal is modulated,
fcFor signal center frequency,
N is signal wave crest number；
3) to the collected health signal of each reception piezoelectric patchesAnd damage signalCarry out difference signal analysis；
4) the damage characteristic signal and signal direct wave in difference signal are found out, its corresponding time is found out according to signal envelope, point
T is not denoted as iti(i=1,2,3,4), Tj(i=1,2,3,4) available signal is in two paths：Motivate piezoelectric patches → damage position
→ receive piezoelectric patches, motivate the time difference Δ t=T propagated in piezoelectric patches → reception piezoelectric patchesi-Tj；
5) with the coordinate of each piezoelectric transducer and the time difference parameter and signal velocity of combination step 4), it is public to substitute into algorithm
Elliptical orbit is constructed in formula, algorithmic formula is：
Wherein, v is Lamb wave velocity of wave,
dmnIt is that signal arrives the flight time for receiving piezoelectric patches by damage reflection again,
(x, y) is damage coordinate, (xm,ym) it is excitation piezoelectric patches coordinate, (xn,yn) it is to receive piezoelectric patches coordinate；
6) four elliptical orbits are constructed according to four reception piezoelectric patches, finds out intersecting point coordinate, and filter out with intersection point discreteness
Damage intersection point.
7) according to gained intersecting point coordinate data in step 6), circumcircle fitting, the fitting circle and structure are carried out according to least square method
Four ellipses built are tangent；
8) central coordinate of circle information and diameter information are obtained according to public circumscribed fitting circle, determines damage position, and carry out
The assessment of degree of injury.
2. according to the composite material ellipse damage reason location detection method described in claim 1 based on public circumcircle is utilized,
It is characterized in that：The piezoelectric transducer uses circular piezoelectric ceramic piece, and each piezoelectric ceramic piece parameter is identical.
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| CN201810467444.4A CN108918668B (en) | 2018-05-16 | 2018-05-16 | Composite material elliptical damage positioning detection method based on common circumscribed circle |
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| CN201810467444.4A CN108918668B (en) | 2018-05-16 | 2018-05-16 | Composite material elliptical damage positioning detection method based on common circumscribed circle |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110376282A (en) * | 2019-07-15 | 2019-10-25 | 北京航空航天大学 | A kind of Lamb wave damage reason location method based on oval probability and Bayesian Estimation |
| CN115797436A (en) * | 2023-01-31 | 2023-03-14 | 深圳市优品文创科技有限公司 | Jewelry production bead diameter identification system based on picture self-filling |
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| US8286492B2 (en) * | 2009-12-09 | 2012-10-16 | The Boeing Company | Mode decomposition of sound waves using amplitude matching |
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- 2018-05-16 CN CN201810467444.4A patent/CN108918668B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8286492B2 (en) * | 2009-12-09 | 2012-10-16 | The Boeing Company | Mode decomposition of sound waves using amplitude matching |
| CN104965025A (en) * | 2015-05-14 | 2015-10-07 | 南京航空航天大学 | Multi-zone damage detection method based on Lamb wave signal correlation coefficient |
Non-Patent Citations (2)
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| 刘钊等: "板内缺陷超声导波阵列检测技术 ", 《仪表技术与传感器》 * |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110376282A (en) * | 2019-07-15 | 2019-10-25 | 北京航空航天大学 | A kind of Lamb wave damage reason location method based on oval probability and Bayesian Estimation |
| CN110376282B (en) * | 2019-07-15 | 2021-06-08 | 北京航空航天大学 | Lamb wave damage positioning method based on ellipse probability and Bayesian estimation |
| CN115797436A (en) * | 2023-01-31 | 2023-03-14 | 深圳市优品文创科技有限公司 | Jewelry production bead diameter identification system based on picture self-filling |
| CN115797436B (en) * | 2023-01-31 | 2023-11-17 | 深圳市优品文创科技有限公司 | Pearl diameter recognition system of pearl machine for jewelry production based on picture self-filling |
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