CN107255674B - A kind of the ultrasound detection scanned imagery device and its application method of cylindrical shell inside coating boundary defect - Google Patents
A kind of the ultrasound detection scanned imagery device and its application method of cylindrical shell inside coating boundary defect Download PDFInfo
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- CN107255674B CN107255674B CN201710472888.2A CN201710472888A CN107255674B CN 107255674 B CN107255674 B CN 107255674B CN 201710472888 A CN201710472888 A CN 201710472888A CN 107255674 B CN107255674 B CN 107255674B
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- 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
- G01N29/06—Visualisation of the interior, e.g. acoustic microscopy
- G01N29/0654—Imaging
- G01N29/069—Defect imaging, localisation and sizing using, e.g. time of flight diffraction [TOFD], synthetic aperture focusing technique [SAFT], Amplituden-Laufzeit-Ortskurven [ALOK] technique
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Abstract
The present invention a kind of the ultrasound detection scanned imagery device and its application method of cylindrical shell inside coating boundary defect respectively drive the rotation of cylindrical shell part using two stepper motors and ultrasonic transducer translate, reach the perfect imaging of inside coating interface cohesion situation.Low frequency pump wave constantly adds vibration to cylindrical shell part during the scanning process, and the purpose for adding vibration is to make the continuous opening and closing of coating interface fine crack, generates nonlinear effect；Meanwhile high-frequency transducer constantly emit/receive ultrasonic signal, non-linear ultrasonic phenomenon occurs under the influence of low frequency pumps wave for the ultrasonic wave received, detects shape and the position of coating interface tiny flaw by extracting non-linear ultrasonic characteristic parameter.The present apparatus has that detection speed is fast, test data is accurate, equipment operation is simple, practical advantage, therefore has broad application prospects.
Description
Technical field
The invention belongs to field of non destructive testing, and what is involved is a kind of scannings of the ultrasound detection of cylindrical shell inside coating boundary defect
Imaging device and its application method.
Background technique
Inside coating is widely used in cylindrical shell important component, for example, power plants generating electricity boiler blasting, automobile engine
The important components such as inboard wall of cylinder block, aero-engine hot end portion thermal insulation layer (thermal barrier coating).Since these key components and parts are located for a long time
In high temperature, wear, wash away, run under the operating conditions such as thermal shock, frequently result in coating shedding, serious wear, oxidation corrosion phenomena such as.It crosses
Early components failure brings security risk, causes huge personal injury and economic loss.So grasping inside coating interface
Quality is just particularly important critical component safety.
Coating interface quality evaluation is always the emphasis of relevant industries concern.Current detection method mainly includes two kinds,
Damage detection and non-destructive testing.Damaging detection method has tension test, scanning electron microscope and x-ray diffraction analysis etc., these are to painting
The test method of bed boundary quality is complicated, and detection cycle is longer.And coating material destroy and could be measured.Non-destructive testing
Method is that the test of certain performances is carried out under the premise of not damaging the service performance of checked object, and measurement accuracy is high, detection
Rapidly, cost is relatively low, has great application potential in modified layer quality evaluation on the surface of the material.Wherein, Ultrasonic Nondestructive
It is to be widely used in one of the methods of testing and evaluating of coating quality at present, but be limited only to the test of coating physical property,
For boundary defect detection also in the qualitative research stage, and be the characterization of coating subrange internal characteristic, can not be complete
Face scanning.In addition, the restriction also by conditions such as internal coating thickness thin, boundary defect is tiny, circumferential curvatures, gives ultrasound detection
Bring that detection process is cumbersome, the low difficulty of defect detection rate.
Summary of the invention
To solve the above-mentioned problems, the present invention provides a kind of quick, comprehensive, lossless cylindrical shell inside coating boundary defect
Ultrasonic scanning image device.
To solve above-mentioned technical problem the technical solution of the present invention is as follows:
A kind of ultrasound detection scanned imagery device of cylindrical shell inside coating boundary defect, including mechanical transmission component, drive
Dynamic component, detection part, electric controling part, it is characterised in that: the mechanical transmission component by ball-screw, linear guide,
Translating bracket, column, cross bar, position adjusting rod, energy converter fixed frame, mounting groove, fishbolt, thrust bearing, clamp handwheel,
Taper pinch wheels one, taper pinch wheels two, bearing one, bearing two, bearing block one, bearing block two, jackshaft, between centers connector,
Tail end axis, bearing three, bearing four form, and the driving part is by rotating stepper motor, translation stepper motor, one group of stepping belt
At, the detection part by low frequency add vibration energy converter, tested cylindrical shell part, high-frequency transducer, signal line group at；It is described
Electric controling part is received card and is formed by host computer, serial communication module, drive control module, transmitting；
The tested cylindrical shell part left end is provided with taper pinch wheels one, and right end is provided with taper pinch wheels two, top
The high-frequency transducer being provided in energy converter fixed frame；One tail end of taper pinch wheels passes through stepping belt one
It is connected with rotating stepper motor, bearing one, bearing two is provided on the outside of middle part, is provided with bearing on the bearing one, bearing two
Seat one；
Two tail portion of taper pinch wheels is connected with thrust bearing, and the thrust bearing tail portion is connected with low frequency and adds vibration transducing
Device, the low frequency add vibration energy converter tail portion to be connected with one end of jackshaft, the other end and between centers connector of the jackshaft
One end be connected, the other end of the between centers connector is connected with one end of tail end axis, the other end of the tail end axis and clamping
Handwheel is connected, and outside is provided with bearing three, bearing four, the bearing three in the middle part of the jackshaft, between centers connector and tail end axis
With bearing block two is provided on bearing four；
Energy converter fixed frame lower end is provided with mounting groove and fishbolt, and upper end is provided with position adjusting rod, described
Position adjusting rod is movably fixed to translating bracket one end, and the translating bracket other end is fixed on the top of column, the column
Bottom is movably fixed on ball-screw, and lower part is fixedly connected with one end of cross bar, and the other end of the cross bar is movably fixed to
In linear guide；One end of the ball-screw is provided with translation stepper motor by stepping belt two；Inside the mounting groove
It is fixed with high-frequency transducer, outside, which is provided with, receives the signal wire that card is connected with transmitting；The transmitting receive card with it is upper
Machine is connected, and the host computer is connected by serial communication module with drive control module.
The drive control module includes single-chip microcontroller, power amplifier, driver one, the composition of driver two, the monolithic
Machine one end is connected by serial communication module with host computer, and the other end passes through power amplifier and driver one and driver two-phase
Even, the driver one is connected with translation stepper motor, and the driver two is connected with rotating stepper motor.
The application method of above-mentioned ultrasound detection scanned imagery device, it is characterised in that: the ultrasonic scanning image device
Detecting step it is as follows:
Step 1: host computer receives card by transmitting and transmits pulsed ultrasonic wave to high-frequency transducer, works as high frequency ultrasound
The pulsed ultrasonic wave of energy converter transmitting is to the coating interface for being tested cylindrical shell inside parts, while low frequency adds vibration energy converter to start work
Make, the tiny flaw in coating is made to generate nonlinear response state under the action of low frequency signal, the letter of high frequency ultrasound detection at this time
Number with low frequency add vibration signal be coupled；
Step 2: rotating stepper motor drives tested one step of the every rotation of cylindrical shell part, high-frequency transducer's transmitting
High-frequency signal is to tested cylindrical shell accessory inner surface, the mixed recharge for adding vibration signal to generate with low frequency after interface is reflected, then by height
Frequency ultrasonic transducer receives, and then computer is arrived in the emitted last storage of reception card, saves detection data, completes a step-length
Detection work；Rotation stops after rotating stepper motor drives tested cylindrical shell part to rotate a circle, and passes through translation step electricity
Machine driving high-frequency transducer moves horizontally at the top of tested cylindrical shell part, is tested cylinder after a mobile step distance
Shell part continues to rotate, and completes detection work until being entirely tested cylindrical shell part；
Step 3: processing in real time is carried out to the signal that high-frequency transducer receives using non-linear ultrasonic theory and is extracted
Nonlinear factor, position and size using coefficient imaging coating interface defect.
The detecting step of the ultrasonic scanning image device is as follows:
Step 1: host computer receives card by transmitting and transmits pulsed ultrasonic wave to high-frequency transducer, works as high frequency ultrasound
The pulsed ultrasonic wave of energy converter transmitting is to the coating interface for being tested cylindrical shell inside parts, while low frequency adds vibration energy converter to start work
Make, the tiny flaw in coating is made to generate nonlinear response state under the action of low frequency signal, the letter of high frequency ultrasound detection at this time
Number with low frequency add vibration signal be coupled；
Step 2: rotating stepper motor drives tested one step of the every rotation of cylindrical shell part, high-frequency transducer's transmitting
High-frequency signal is to tested cylindrical shell accessory inner surface, the mixed recharge for adding vibration signal to generate with low frequency after interface is reflected, then by height
Frequency ultrasonic transducer receives, and then computer is arrived in the emitted last storage of reception card, saves detection data, completes a step-length
Detection work；Rotation stops after rotating stepper motor drives tested cylindrical shell part to rotate a circle, and passes through translation step electricity
Machine driving high-frequency transducer moves horizontally at the top of tested cylindrical shell part, is tested cylinder after a mobile step distance
Shell part continues to rotate, and completes detection work until being entirely tested cylindrical shell part；
Step 3: processing in real time is carried out to the signal that high-frequency transducer receives using non-linear ultrasonic theory and is extracted
Nonlinear factor, position and size using coefficient imaging coating interface defect.
Acoustic theory according to the present invention is as follows:
Compound voice field excitation coefficient under non-linear parameter:
For coating material, the principal mode of defect between matrix and interface between bonding defect.Bonding defect from its
Two aspects can be divided into physical meaning: first is that unsticking class defect, including complete air debonding defect and mechanical fitting defect,
It is often the part of small area, incoherent；Second is that intensity class defect, it be often large area, link up it is sheet of.It is non-
Linear ultrasonic detection is then when being propagated in the material using ultrasonic wave, and medium or tiny flaw interact therewith the non-thread of generation
Property response signal, carries out the assessment of material property and the detection of tiny flaw, what is substantially reflected is that tiny flaw is non-to material
Linear influence.Ultrasound non-linear response signal contains the useful information of reflection defect and material properties.Since defect is drawn
The medium risen discontinuously and unevenly will show very strong nonlinear effect, non-linear ultrasonic under the action of significantly ultrasonic
Non-destructive testing can obtain useful ultrasound non-linear response signal by corresponding measurement method, therefrom obtain reflection defect
Information.The extracting mode of nonlinear acoustics parameter is as follows:
For one-dimensional stress strain stress relationσ=Eε-Fε 2,β=2F/E.Therefore one-dimensional Non-linear elastic wave equation can be rewritten
Are as follows:
(1)
The lower one-dimensional Non-linear elastic longitudinal wave non trivial solution of surface analysis.To put it more simply, aftermentioned part is by longitudinal wave velocityc LWrite a Chinese character in simplified form
Forc。
According to perturbation theory, it is assumed that the solution of nonlinear wave equations (1) are as follows:
(2)
In formulau (1)It represents due to the displacement caused by non-linear.It is further assumed that the nonlinear displacement and wave propagate away from
From directly proportional, that is, have:
(3)
In formulaτ=t-x/c, andh(τ) it is unknowm coefficient undetermined.Formula (2) is updated in formula (1), following equation can be obtained:
(4)
Above formula is arranged and omittedβHigh-order term after, have:
(5)
Above formula can regard two formula compositions as, and one does not includeβ, linear elasticity wave equation:
(6)
Another formula includesβ, i.e.,
(7)
Work as nonlinear factorβWhen being zero, formula (5) becomes linear elasticity wave equation.
When ultrasonic wave is propagated in nonlinear dielectric, the distortion of wave can be generated, typical phenomenon is under single harmonic excitation
Generate higher hamonic wave.And when existing simultaneously the oscillator field of two different frequency sound waves formation in medium, medium is non-linear can be with
Another mode shows, i.e. non-linear modulation between different frequency wave.u (0)(x,t)=f 1(t-x/c) andu (0)(x,t)=f 2(t-x/c) be equation (6) solution, according to linear superposition theorem,u (0)(x,t)=f 1(t-x/c)+ f 2(t-x/c) be also
The solution of equation (6).By taking two different frequency cosine acoustic wave excitations as an example, acoustic attenuation and initial phase difference are not considered, if
(8)
In formulaA 1Withω 1The respectively frequency and amplitude of ultrasound detection pumping signal；A 2Withω 2Respectively pump wave adds vibration to believe
Number frequency and amplitude, therefore,ω 1>ω 2。
(9)
In formula,xFor propagation distance；βFor ultrasound non-linear coefficient；k 1,k 2Respectively ultrasound detection detection signal and pump wave adds
The wave number of vibration signal；Becausek =ω/c 0,c 0For the velocity of sound, so, when the frequency of single harmonic is fixed,k 1,k 2It is considered as not
The amount of change.From the point of view of frequency content, in above formula in addition toω 1,ω 2Fundametal compoment other than, also create 2ω 1, 2ω 2It is secondary
Harmonic wave, andω 1+ω 2,ω 1-ω 2Modulation mixing wave component.Therefore it is bred with the higher hamonic wave under single harmonic excitation existing
As similar, modulation phenomenon can be regarded as the non-linear another performance shape at two and under more than two vibration field actions of medium
Formula.
If the amplitude of each order frequency component can be extracted from measuring signal, nonlinear factor can calculate as follows
(10)
From the above equation, we can see that only it is to be understood thatω 1,ω 2, 2ω 1, 2ω 2,ω 1+ω 2,ω 1-ω 2The amplitude of each frequency, Yi Jichuan
Broadcast distancexCan calculate nonlinear factor (k 1,k 2For datum).Wherein the second harmonic amplitude of formula (10a) is with incoming wave
Intensity and frequency quadratic power it is directly proportional, while the directly proportional relationship at a distance from wave propagation.The intensity of incoming wave is bigger,
Frequency is higher, and the second harmonic amplitude is also just more obvious.But the limited extent of incoming wave, it is necessary to using higher input frequency at
For the conventional means for detecting the second harmonic.It is required that ultrasound detection tranmission/reception apparatus power with higher, increases inspection in this way
The cost of measurement equipment.It needs fundamental wave and low frequency to pump wave if solving nonlinear factor using formula (10b) and formula (10c) to enter jointly
The amplitude of the mixed recharge of generation is penetrated, but the cost of detection device can be substantially reduced.The purpose that the present invention is pumped plus shaken using low frequency
Exactly increase fundamental wave and low frequency pump wave generates the amplitude of mixed recharge.It is secondary humorous that pump wave adds vibration to make than large amplitude and high frequency wave incidence
The increase of wave amplitude is more effective, higher to the resolution ratio of defect.Nonlinear factor formula is as follows:
(11)
Wherein, A (ω 1+ω 2) it is fundamental wave and the frequency amplitude for pumping wave mixed recharge；A(ω 1) it is that the frequency of fundamental wave answers amplitude；A
(ω 2) it is the frequency amplitude for pumping wave；βIt is nonlinear factor；X isPropagation distance.
Nonlinear system number calculating method based on wavelet reconstruction
Wavelet function is a finite energy vibration equation centered on 1/2, its reconstruction signal of wavelet transform can
To be expressed as:
(12)
Herec j,k For wavelet coefficient,ψ j,k (t) it is by small echoψ(t) chest expanding, extension and translation small wave system.
Assuming that small wave systemψ j,k (t), k∈ZBeW j One group of orthogonal basis in space.Φ(t) it is wavelet functionψ(t)
Scaling function, and small wave systemΦ j,k (t), k∈Z(Φ j,k (t) it is to pass throughΦ (t) extension and translation obtain) beV j Space
One group of orthogonal basis.According to scale and small wave equation, a low-pass filter and a high-pass filter can produce, they
Effect equationh(k)、g(k) it is respectively defined as:
(13)
(14)
Then spaceV j-1A sub-spaces can be decomposed intoV j An and high-frequency information spaceW j Sum,W j It is then spaceV j-1The subspace andV j It is orthogonal.And haveV j ∈V j-1, then have:
(15)
Then, a certain signal is in spaceV j-1On quadrature component can be considered asW j WithV j Sum.HereW j WithV j It can
To pass throughV j It is obtained with low pass or the convolution of high-pass filter.Wherein, low pass wavelet coefficientc j,k And high pass wavelet coefficientd j,k It is indicated respectively with following formula:
(16)
(17)
h(m-2k) andg(m-2k) it is by coefficienth(k) andg(k) be inserted into respectivelyj- 10 reconstruct equation.
DefinitionC j s(t) andD j s(t) be respectivelyjThe low frequency and high-frequency decomposition amount of scale.Then they can be indicated are as follows:
(18)
(19)
In this way, for some signals(t) 1 Scale Decomposition can be expressed as:
(20)
s(t) 2 Scale Decompositions can be expressed as:
(21)
s(t) 3 Scale Decompositions can be expressed as
(22)
s(t)JScale Decomposition,
(23)
Combination type (20)-formula (23),JAfter Scale Decomposition,s(t) it is expressed as:
(24)
Discussed above is the method for Wavelet decomposing and recomposing, whereinC、DSubscript represents decomposition scale, superscript generation
Table frequency from low to high where position.It can thus be appreciated that: small echo can be used as a bandpass filter, remove useless frequency
Section, leaves useful frequency band.Extracting ultrasonic wave and generating the premise of nonlinear factor in coating communication process is to solve base
The mixing wave amplitude of wave and low frequency pump waveA(ω 1+ω 2) and fundamental wave amplitudeA(ω 1).Assuming that the range of fundamental frequency existsJScale
UndermIn frequency range, it is as follows to extract signal method:
(25)
To signalr(t) Fourier transformation is done, fundamental wave can be solved and pump the mixing wave amplitude of waveA(ω 1+ω 2) and base
Wave amplitudeA(ω 1).Then its amplitude is calculated using frequency spectrum to acquisition low frequency pump wave signalA(ω 2).Finally, known toA(ω 1
+ω 2),A(ω 1),A(ω 2) substitute into formula (11) nonlinear factor can be calculated.
The present invention respectively drives the rotation of cylindrical shell part using two stepper motors and ultrasonic transducer translates, and reaches interior
The perfect imaging of wall coating interface combination situation.Low frequency pump wave constantly adds vibration to cylindrical shell part during the scanning process, adds vibration
Purpose is to make the continuous opening and closing of coating interface fine crack, generates nonlinear effect；Meanwhile high-frequency transducer is constantly sent out
Penetrate/ultrasonic signal is received, non-linear ultrasonic phenomenon occurs under the influence of low frequency pumps wave for the ultrasonic wave received, non-by extracting
Linear ultrasonic characteristic parameter detects shape and the position of coating interface tiny flaw.The present apparatus has that detection speed is fast, test
Data are accurate, equipment operation is simple, practical advantage, therefore have broad application prospects.
Detailed description of the invention
Fig. 1 is the general frame of ultrasonic scanning image device scan imaging method；
Fig. 2 is the working principle block diagram of ultrasonic scanning image device drive control module；
Fig. 3 is the structure chart of ultrasonic scanning image device；
Fig. 4 is the side view of Fig. 3 ultrasonic scanning image device；
Fig. 5 is cylindrical shell inside coating boundary defect distribution imaging after detection.
Specific embodiment
1-5 and specific embodiment are made the structure of ultrasonic scanning image device of the present invention further detailed with reference to the accompanying drawing
Thin explanation:
A kind of ultrasonic scanning image device of cylindrical shell inside coating boundary defect, including mechanical transmission component, driving portion
Part, detection part, electric controling part, it is characterised in that: the mechanical transmission component by ball-screw 19, linear guide 21,
Translating bracket 17, column 18, cross bar 20, position adjusting rod 16, energy converter fixed frame 4, mounting groove 14, fishbolt 15, thrust
Bearing 10 clamps handwheel 13, taper pinch wheels 1, taper pinch wheels 23, bearing 1, bearing 28, bearing block 1, bearing
Seat 2 12, jackshaft 25, between centers connector 26, tail end axis 27, bearing 3 29, bearing 4 28 form, and the driving part is by revolving
Turn stepper motor 6, translation stepper motor 22, stepping belt 1 to form, the detection part adds vibration energy converter 11, quilt by low frequency
Survey cylindrical shell part 1, high-frequency transducer 23, the composition of signal wire 24；The electric controling part is by host computer, serial communication
Module, drive control module, transmitting receive card composition；
Tested 1 left end of cylindrical shell part is fastened with taper pinch wheels 1, and right end is fastened with taper pinch wheels 23, top
Portion is fixed with energy converter fixed frame 4；Rotation has been bolted by stepping belt 1 in one 2 tail end of taper pinch wheels
Stepper motor 6, middle part outside are connected with bearing 1, bearing 28, have been bolted axis on the bearing 1, bearing 28
Hold seat 1；
Thrust bearing 10 has been bolted in 23 tail portion of taper pinch wheels, and 10 tail portion of thrust bearing passes through
It has been bolted low frequency and has added vibration energy converter 11, the low frequency adds one end phase of vibration 11 tail portion of energy converter by bolt and jackshaft 25
Even, the other end of the jackshaft 25 is connected by bolt with one end of between centers connector 26, the between centers connector 26
The other end is connected by bolt with one end of tail end axis 27, and the other end of the tail end axis 27 passes through bolt and clamping 13 phase of handwheel
Even, the jackshaft 25, between centers connector 26 and 27 middle part outside of tail end axis are connected with bearing 3 29, bearing 4 28, the axis
It holds and has been bolted bearing block 2 12 on 3 29 and bearing 4 28；
4 lower end of energy converter fixed frame is fixed with mounting groove 14 and fishbolt 15 by screw, and upper end passes through bolt
It is fixed with position adjusting rod 16, the position adjusting rod 16 is movably fixed to 17 one end of translating bracket, the translation by bolt
17 other end of bracket is bolted on the top of column 18, and 18 bottom of column is movably fixed to ball wire by bolt
On thick stick 19, lower part and one end of cross bar 20 are bolted to connection, and the other end of the cross bar 20 is fixed by bolt activity
In linear guide 21；One end of the ball-screw 19 has been fixed by bolts translation stepper motor by stepping belt 2 30
22；It is connected with high-frequency transducer 23 inside the mounting groove 14, is externally connected to and receives the signal wire that card is connected with transmitting
24；The transmitting receives card and is connected by signal wire with host computer, and the host computer passes through signal wire and serial communication module phase
Even, the serial communication module is connected by signal wire with drive control module.
The drive control module includes single-chip microcontroller, power amplifier, driver one, the composition of driver two, the monolithic
Machine one end is connected by signal wire with serial communication module, and the other end is connected by signal wire with power amplifier, the power
Amplifier is connected by signal wire with driver one and driver two, and the driver one passes through signal wire and translation stepper motor
22 are connected, and the driver two is connected by signal wire with rotating stepper motor 6.
Now with further being illustrated to nonlinear factor of the present invention of detection example:
Tested 1 matrix of cylindrical shell part is 45 steel；Appearance facing to outer diameter 59mm, internal diameter 45mm, length 150mm,
Inner-wall material is Al2O3+TiO2Plasma sprayed coating coating, coating layer thickness are about 450um.
When starting detection, the axial position of high-frequency transducer 23 and tested cylindrical shell part 1 is adjusted first, makes transducing
The axial distance of device center and tested part coating interface is 40mm.Supersonic detection device is non-the connecing of Japanese probe company production
The transmitting of touch ultrasound detection receives card, model JPR-10CN；Low frequency is selected to add vibration energy converter 11 as pump wave launcher, center
Frequency is 0.2MHz；Focused broad-band non-contact ultrasonic energy converter 23 is selected, bandwidth 0.5MHz-1MHz, focal length 40mm are needed
What is said is formula (11) propagation distancexAs focal length 40mm；It is as follows to detect emission parameter: frequency 550kHz, sample frequency
For 25MHz, sampling length 2k, power 500W.Tested 1 inner wall interface circumference 143mm of cylindrical shell part, rotating stepper motor
6 step angle is 1.5 °, one week 240 subpulse of transmitting of every work, can complete tested cylindrical shell part measurement in 1 one weeks；
Tested 1 length of cylindrical shell part is 150mm, and 22 stepping length of translation stepper motor are 0.6mm, amounts to 250 arteries and veins of transmitting
Punching can complete the measurement on tested 1 length direction of cylindrical shell part.
Need to do seven layers of small wavelength-division by the ultrasonic signal of the received device of high-frequency transducer 23 storage to computer
Solution, signal frequency are divided into 128 frequency bands, and frequency range is from 0 to 12.5MHz, about 100 kHz of band separation, are equal to low frequency and pump
Wave adds vibration frequency half.It sets low frequency and pumps wave frequency rateω 2For 200kHz, fundamental frequencyω 1When for 550kHz, fundamental wave and low frequency are pumped
The mixed recharge of waveω 1+ω 2For 750 kHz, chooseω 2,ω 1,ω 1+ω 2 Three band limits signals, frequency range are respectively
100kHz-300kHz, 500kHz-600kHz and 700kHz-800kHz.Selected low frequency is recycled to pump wave frequency rateω 2, fundamental wave frequency
Rateω 1, the mixing wave frequency rate of fundamental wave and low frequency pump waveω 1+ω 2Place frequency range is reconstructed, and calculates the frequency of reconstruction signal
Spectrum can obtain low frequency pump wave amplitudeA(ω 2), fundamental voltage amplitudeA(ω 1) and fundamental wave and low frequency pump wave mixing wave amplitudeA(ω 1+ω 2).Finally willA(ω 2),A(ω 1),A(ω 1+ω 2), propagation distancexParameter is updated to the solution formula of nonlinear factor
(11), nonlinear factor is calculated.The point of each scanning of Fig. 5 represents a nonlinear system numerical value, gives cylindrical shell inner wall
The imaging of coating interface defect distribution, the figure are the two-dimensional development form of tested cylinder shell mould coating interface, length 150mm, width
143mm, it is 240 × 250 that the points of scanning, which are enclosed,.The position of coating interface defect is shown in Fig. 5, color is deeper to represent intact area
Domain, on the contrary represent defect area.
The above, the preferable specific embodiment of type only of the present invention, but type protection scope of the present invention is not limited to
This, the technical solution of type and its inventive concept are subject to equivalent substitution or change according to the present invention, should all cover in type of the present invention
Within protection scope.
Claims (3)
1. a kind of ultrasound detection scanned imagery device of cylindrical shell inside coating boundary defect, including mechanical transmission component, driving
Component, detection part, electric controling part, it is characterised in that: the mechanical transmission component is by ball-screw (19), linear guide
(21), translating bracket (17), column (18), cross bar (20), position adjusting rod (16), energy converter fixed frame (4), mounting groove
(14), fishbolt (15), thrust bearing (10), clamp handwheel (13), taper pinch wheels one (2), taper pinch wheels two (3),
Bearing one (7), bearing two (8), bearing block one (9), bearing block two (12), jackshaft (25), between centers connector (26), tail end axis
(27), bearing three (29), bearing four (28) composition, the driving part is by rotating stepper motor (6), translation stepper motor
(22), stepping belt one (5) forms, and the detection part adds vibration energy converter (11), tested cylindrical shell part (1), height by low frequency
Frequency ultrasonic transducer (23), signal wire (24) composition；The electric controling part is controlled by host computer, serial communication module, driving
Molding block, transmitting receive card composition；
Tested cylindrical shell part (1) left end is provided with taper pinch wheels one (2), and right end is provided with taper pinch wheels two (3),
Top is provided with the inner high-frequency transducer (23) of energy converter fixed frame (4)；Taper pinch wheels one (2) tail end
It is connected with rotating stepper motor (6) by stepping belt one (5), is provided with bearing one (7), bearing two (8) on the outside of middle part, it is described
Bearing block one (9) is provided on bearing one (7), bearing two (8)；
Taper pinch wheels two (3) tail portion is connected with thrust bearing (10), and thrust bearing (10) tail portion is connected with low frequency
Add vibration energy converter (11), the low frequency adds vibration energy converter (11) tail portion to be connected with one end of jackshaft (25), the jackshaft
(25) the other end is connected with the one end of between centers connector (26), the other end of the between centers connector (26) and tail end axis (27)
One end be connected, the other end of the tail end axis (27) is connected with clamping handwheel (13), the jackshaft (25), between centers connector
(26) and in the middle part of tail end axis (27) outside is provided with bearing three (29), bearing four (28), the bearing three (29) and bearing four
(28) bearing block two (12) is provided on；
Energy converter fixed frame (4) lower end is provided with mounting groove (14) and fishbolt (15), and upper end is provided with position adjusting
Bar (16), the position adjusting rod (16) are movably fixed to translating bracket (17) one end, and translating bracket (17) other end is solid
It is scheduled on the top of column (18), column (18) bottom is movably fixed on ball-screw (19), lower part and cross bar (20)
One end is fixedly connected, and the other end of the cross bar (20) is movably fixed on linear guide (21)；The ball-screw (19)
One end is provided with translation stepper motor (22) by stepping belt two (30)；High frequency ultrasound is fixed with inside the mounting groove (14)
Energy converter (23), outside, which is provided with, receives the signal wire (24) that card is connected with transmitting；The transmitting receives card and is connected with host computer,
The host computer is connected by serial communication module with drive control module.
2. ultrasound detection scanned imagery device according to claim 1, it is characterised in that: the drive control module includes
Single-chip microcontroller, power amplifier, driver one, driver two form, described single-chip microcontroller one end by serial communication module with it is upper
Machine is connected, and the other end is connected by power amplifier with driver one and driver two, the driver one and translation step electricity
Machine (22) is connected, and the driver two is connected with rotating stepper motor (6).
3. the application method of ultrasound detection scanned imagery device according to claim 1, it is characterised in that: the ultrasound inspection
The detecting step for surveying scanned imagery device is as follows:
Step 1: host computer receives card by transmitting and transmits pulsed ultrasonic wave to high-frequency transducer (23), works as high frequency ultrasound
The pulsed ultrasonic wave of energy converter (22) the transmitting coating interface internal to tested cylindrical shell part (1), while low frequency adds vibration transducing
Device (11) is started to work, and the tiny flaw in coating is made to generate nonlinear response state under the action of low frequency signal, high at this time
Frequency ultrasound detection signal adds vibration signal to be coupled with low frequency；
Step 2: rotating stepper motor (6) drives tested one step of cylindrical shell part (1) every rotation, high-frequency transducer (23)
The high-frequency signal of transmitting adds the mixing of vibration signal generation to tested cylindrical shell part (1) inner surface after interface is reflected with low frequency
Wave, then received by high-frequency transducer (23), then computer is arrived in the emitted last storage of reception card, detection data is saved,
Complete the detection work an of step-length；It is rotated after rotating stepper motor (6) drive tested cylindrical shell part (1) to rotate a circle
Stop, being made at the top of tested cylindrical shell part (1) by translation stepper motor (22) driving high-frequency transducer (23) horizontal
It is mobile, cylindrical shell part (1), which is tested, after a mobile step distance continues to rotate, it is complete until being entirely tested cylindrical shell part (1)
At detection work；
Step 3: processing in real time is carried out to the signal that high-frequency transducer (23) receives using non-linear ultrasonic theory and is extracted
Nonlinear factor, position and size using coefficient imaging coating interface defect.
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