CN112432998A - Ultrasonic nondestructive testing method for rubber plate bonding defects with acoustic cavity structure - Google Patents
Ultrasonic nondestructive testing method for rubber plate bonding defects with acoustic cavity structure Download PDFInfo
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Abstract
The invention provides an ultrasonic nondestructive testing method for bonding defects of a rubber plate with an acoustic cavity structure. The method is based on a single-channel/multi-channel acoustic detection system, the relation between the bonding state and the sound field characteristic quantity is established through the bonding structural part based on the principle of ultrasonic detection, the signal is processed and imaged and analyzed, the nondestructive detection of the bonding quality of the rubber plate with the acoustic cavity structure is realized, and the acoustic quality control capability of the bonded rubber plate with the acoustic cavity structure is improved; the continuity of the bonding of the rubber plate with the vocal cavity structure is ensured, and the integral acoustic function of the material is improved; the method provides the test of the whole-area bonding quality of the rubber plate with the vocal cavity structure, and improves the detection accuracy; the position, the area and the depth of the defect are accurately judged by adopting special detection image analysis and A/B/C scanning, and the early judgment of the bonding defect of the rubber plate with the acoustic cavity structure and the measurement and calculation of the effective bonding area are met. The ultrasonic nondestructive testing method is suitable for being applied as a rubber plate bonding defect ultrasonic nondestructive testing method with a sound cavity structure.
Description
Technical Field
The invention relates to the technical field of rubber plate bonding quality detection, in particular to an ultrasonic nondestructive detection method for bonding defects of a rubber plate with an acoustic cavity structure.
Background
The rubber plate with the sound cavity structure is an important means for realizing vibration and noise reduction of a ship structure, a mechanical part and the like, and if the bonding surface of the rubber plate has the defects of glue shortage, air gaps and bubbles after bonding, the firmness and the noise elimination performance of the rubber plate can be reduced, and even the rubber plate falls off.
At present, the bonding quality of a rubber plate with a sound cavity structure is subjected to sampling inspection by a cork pulling method, and the bonding condition of the rubber plate and a substrate is judged by a tensile strength value. This method has the following problems: construction is difficult, and detection efficiency is low; the rubber plate needs to be drilled by pulling out the plug, so that the rubber plate body is damaged, and the vibration reduction and noise reduction performance is adversely affected; the detection area and the sampling quantity are limited, and the whole bonding condition cannot be reflected.
Disclosure of Invention
In order to complete the detection of avoiding the damage of the rubber plate body and reflecting the bonding quality of the rubber plate on the whole, the invention provides an ultrasonic nondestructive detection method for the bonding defect of the rubber plate with an acoustic cavity structure. The method is a nondestructive testing method for the rubber plate bonding defect with the vocal cavity structure, which is formed by establishing the relation between the bonding state and the sound field characteristic quantity through a bonding structural member, processing and imaging analyzing signals, realizing nondestructive prediction of the bonding quality of the rubber plate and acoustic quality control capability, quantifying the effective bonding area of the rubber plate and solving the technical problem of ultrasonic nondestructive testing of the bonding defect of the rubber plate by applying the physical principle of ultrasonic testing and based on a single-channel/multi-channel acoustic testing system.
The technical scheme adopted by the invention comprises the following steps:
(1) in order to meet the simulation calculation of an ultrasonic sound field, the acoustic physical parameters influencing the rubber plate material with the sound cavity structure are measured, and the measurement mainly comprises theoretical sound velocity, attenuation coefficient, ultrasonic attenuation coefficient measurement of a detection center, material average density of the rubber plate, geometric dimension of the cavity and the like.
(2) Simulating and calculating an ultrasonic sound field under the bonding state of complete bonding and different bonding states of debonding, establishing a relation between the bonding state and the sound field characteristics, and obtaining a theoretical value of an ultrasonic detection key parameter;
(3) accumulating ultrasonic typical signal processing through a detection test, and forming a debonding curve recognition algorithm through signal image characteristic rule analysis;
(4) manufacturing test pieces with different bonding defect sizes, and accumulating ultrasonic echo signals and images in different bonding states through different manual bonding test pieces to form an effective method for identifying debonding defects;
(5) and (4) evaluating the detection capability of the defect detection rate and the false alarm rate according to the detection results of the manually bonded test pieces with different materials, different thicknesses and different depths.
(6) Setting a detection path of the rubber plate, performing detection by stepping by 50mm in a two-dimensional scanning mode according to the diameter of 50mm of the probe, and performing water spray coupling in the detection process;
(7) determining the position, area and depth of the defect through ultrasonic A scanning/ultrasonic B scanning/ultrasonic C scanning; and (4) counting the effective bonding area of the rubber plate and determining a test criterion.
The ultrasonic nondestructive testing process of the rubber plate with the vocal cavity structure comprises the following steps:
the detection method comprises the following steps: determination of a detection method → measurement of physical parameters of a detection object → establishment of a simulation model → parameter setting → simulation calculation of an ultrasonic sound field → analysis of signal characteristics → satisfaction of a requirement → (no → repeated parameter setting → simulation calculation of an ultrasonic sound field → analysis of signal characteristics → satisfaction of a requirement) is → determination of a detection method;
after the parameters are set, a comprehensive detection system meeting the detection object is formed, and the detection system mainly comprises a signal processing system, an ultrasonic system control system, an imaging algorithm, a scanning path and mechanical control system, and a data processing and analyzing system.
Wherein, the detection method is determined → the physical parameter measurement of the detected object → the establishment of the simulation model → the parameter setting → the comprehensive detection system → the design of the artificial bonding defect → the artificial processing test piece → the test piece inspection → the identification method of the debonding defect (ultrasonic A scanning/ultrasonic B scanning/ultrasonic C scanning) → (not meeting the requirement → the design of the artificial bonding defect → the artificial processing test piece → the test piece inspection → the identification method of the debonding defect) → meeting the requirement;
when the test piece meets the requirements → detection of bonding defects of different materials and different thicknesses → defect detection capability evaluation → data statistical analysis → determination of detection size → detection capability evaluation;
after the device detection capability is evaluated → the bonding quality is detected → the detection path is set → the defect position, area and depth → the effective bonding area is judged.
The nondestructive testing method for the bonding defects of the rubber plate with the vocal cavity structure, provided by the invention, avoids the damage to the rubber plate body with the vocal cavity structure by the traditional cork pulling testing method, ensures the bonding continuity of the rubber plate with the vocal cavity structure and improves the integral acoustic function of the material; according to the invention, the detection accuracy is improved through the whole-area bonding quality inspection of the rubber plate with the vocal cavity structure; automatic scanning of a certain area is realized through two-dimensional automatic scanning; the position, the area and the depth of the defect are accurately judged by special detection image analysis and ultrasonic A scanning/ultrasonic B scanning/ultrasonic C scanning, and the early judgment of the bonding defect of the rubber plate with the acoustic cavity structure and the measurement and calculation of the effective bonding area are realized. The method is suitable for being used as a nondestructive testing method of the rubber plate.
Drawings
FIG. 1 is a schematic view of the ultrasonic nondestructive testing process of a rubber plate with a vocal cavity structure;
FIG. 2 is a schematic diagram of a rubber plate acoustic cavity structure with an acoustic cavity structure;
FIG. 3 is a schematic diagram of the theory of sound wave propagation in a layered medium;
FIG. 4 is a schematic diagram of the simulation effect of the echo signal of the perfect bonding and debonding model;
FIG. 5 is a frequency domain characteristic analysis diagram of echo signal detection of a perfect bonding and debonding model;
FIG. 6 is a schematic view of an ultrasonic three-dimensional scan;
FIG. 7 is a front view of an artificial defect test piece;
FIG. 8 is a schematic view of a defect specimen;
FIG. 9 is a schematic diagram of ultrasound A scan/ultrasound B scan/ultrasound C scan imaging;
fig. 10 is a schematic diagram of a two-dimensional scanning path of a rubber plate with a vocal cavity structure.
In the figure: 1. an acoustic cavity structure; 2. ultrasonic A scanning; 3. b, ultrasonic scanning; 4. ultrasonic C scanning; 5. a manual bonding piece; 6. artificial defects of different diameters; 7. a scanning path.
Detailed Description
The following detailed description of the embodiments of the invention is provided in connection with the accompanying drawings.
1. Measuring the acoustics physical parameters of the rubber plate material with the vocal cavity structure:
a. theoretical sound velocity measurement:
the rubber plate material of the vocal cavity structure 1, which is not attached to the steel plate in a certain area, is taken as a detection sample, different positions of five points are uniformly selected for measurement, ultrasonic measurement is carried out by adopting one-shot and one-shot reception, two transducers are arranged on two sides of the detection sample, and the time t of a first received pulse signal is recorded. The thickness of the rubber plate with the vocal cavity structure is T, and the theoretical sound velocity V of the rubber plate with the vocal cavity structure is obtained as follows:
V=T/t.
the five position measurement sound speed values are averaged.
b. And (3) measuring the attenuation coefficient and the ultrasonic attenuation coefficient of the detection center:
the attenuation coefficient is related to the central frequency of the detection ultrasound, the frequency range of the detection ultrasound is determined before measurement, two rubber plate materials with different thicknesses and vocal cavity structures of 50mm/80mm are selected as detection samples, five points and different positions are uniformly selected for measurement, the arrangement principle of a transducer is the same as the method for measuring the ultrasonic sound velocity in the rubber plate materials with the vocal cavity structures, and the amplitude of a first received pulse signal is recorded. The thickness of the first sample is measured to be T1, and the transmission amplitude is A1; the second sample had a thickness of T2 and a transmission amplitude of A2. Calculating to obtain the attenuation coefficient of the rubber plate with the vocal cavity structure as alpha:
α=20lg(∣A1-A2∣/max(A1,A2)/(∣T1-T2∣)
and averaging the attenuation coefficient values measured at the five positions, wherein the average value is used as the actual attenuation coefficient of the rubber plate of the vocal cavity structure which is the detection object.
c. The average density of the material of the rubber plate with the sound cavity structure and the geometric dimension of the sound cavity structure 1 can be directly input, and the apparent density is 1.1Kg/m3。
2. Inputting sound field parameters of a simulation model:
and establishing a simulation model of the ultrasonic sound field of the rubber plate with the sound cavity structure by using a sound field theoretical analysis and numerical calculation method. The effect of the acoustic cavity structure on the detected acoustic waves was analyzed by comsol numerical simulation, as shown in fig. 2. And (3) the detection signal is equivalent to a signal from a non-cavity domain structure and a cavity domain bonding structure by adopting an equivalent model decomposition method, and the sound wave propagation rule of the rubber plate multilayer medium with the sound cavity structure is analyzed by utilizing the layered medium propagation theory.
As shown in FIG. 3, the rubber plate with the acoustic cavity structure is an n-layer structural material, all media in the material are assumed to be isotropic media, wherein the density, the thickness and the longitudinal sound velocity of the n-th layer of media are respectively expressed by rhon、dnAnd cnIndicating that the (n + 1) th layer of media and the 0 th layer are both semi-infinite media. And the incident sound wave Pin vertically enters from the interface between the nth layer medium and the (n + 1) th layer medium to obtain the reflected wave Pout of the whole multilayer system. According to the Buchhofschz theory, the expression of the reflection coefficient of the n-layer structure system is deduced:
wherein r isn=(ZNDL-Zn+1)/(Zn+Zn+1) Is the reflection coefficient of the interface of the (n + 1) th layer medium, RNDL-1(f) The reflection coefficient of the whole system is obtained by the vertical incidence of the sound wave from the interface of the nth layer medium and the NDL-1 layer. R0=r0=（Z0-Z1）/( Z0+Z1)， Zn=ρncnRepresenting the specific acoustic impedance of the nth layer of medium; t is tn=dn/cnWhen acoustic, it represents the time for an acoustic wave to travel in a single pass through the medium; equivalent attenuation factor alphan=βncn/2 π f, representing the complex wave number Kn=Kn ’+j Kn ’’Ratio of imaginary real parts of Kn ’’/ Kn ’。
3. The method for identifying the debonding curve comprises the following steps:
using a Gaussian signal as the incident sound wave XInThe simulation signal of (2):
wherein f is0In order to detect the acoustic wave center frequency, B is the bandwidth coefficient, ψ is the initial phase, and t is time, the detection output signal obtained from equations (1) (2) is:
y(t)=IFFT(FFT(Xin（t）)R(w))
by utilizing the conditions, the state of a bonding interface is changed, the influence of gap thickness changes such as good bonding, debonding and the like is analyzed, and the sound wave propagation rule under the conditions of good bonding and different debonding is obtained. A method for discriminating the air-debonding harmonic ratio is proposed, as shown in fig. 4 and 5. The echo signal simulation effect and the frequency domain characteristics detected by the complete bonding and debonding model.
Through sound field simulation calculation, the propagation and scattering conditions of ultrasonic waves in a rubber plate with a sound cavity structure are simulated, and simulation results such as the influence of material attenuation on detection sensitivity, the influence of a complex structure on signal characteristics, the influence of fitting matching and parameter setting on detection results and the like are obtained.
4. Aiming at the characteristics of high attenuation and complex structure of the rubber plate with the vocal cavity structure, the special ultrasonic automatic detection system for detecting the bonding defect of the rubber plate with the vocal cavity structure is designed to form an ultrasonic image as three-dimensional data, namely ultrasonic A scanning 2, ultrasonic B scanning 3 and ultrasonic C scanning 4 detection imaging, as shown in figure 6. Where a-scan imaging is a one-dimensional display reflecting the amplitude of the acoustic wave as a function of time, i.e., a waveform map, representing the location of the defect. The B scanning image reflects the imaging of the object section parallel to the sound beam propagation direction, and is the superposition of a series of A displays, one axis is used for expressing the sound wave propagation distance, the other axis is used for expressing the distance scanned by the probe along the surface of the workpiece, the image color or gray scale reflects the sound wave signal amplitude, and the areas with different colors or gray scales are debonding areas and express the depth of the defect. The C scanning image reflects the imaging of the section of the object vertical to the propagation direction of the sound beam, and the A scanning waveform can comprehensively reflect the propagation characteristics of the sound wave inside each scanning point. The C scanning image shows the cross section of the workpiece, the scanning view of the probe corresponds to X, Y coordinates on the image, the color or gray of the image reflects the characteristics of the sound wave signals in a certain depth range of the workpiece, and the areas with different colors or gray levels are debonding areas and represent the areas of defects.
Manufacturing an artificial bonding piece 5, and setting artificial defects 6 with different diameters from phi 30-50 mm as shown in figures 7 and 8. Ultrasonic echo signals and images in different bonding states are accumulated to form an effective identification method of bonding defects. Test pieces with different bonding defect sizes are manufactured, ultrasonic echo signals and images in different bonding states are accumulated through different manual bonding pieces 5, and an effective method for identifying debonding defects is formed, and is shown in fig. 9.
5. And (4) evaluating the detection capability of the defect detection rate and the false alarm rate according to the detection results of the manually bonded test pieces with different materials, different thicknesses and different depths.
Rubber plates with 50mm thick and 80mm thick vocal cavity structures are manufactured respectively to bond artificial samples, the defects meet the requirement of minimum identification of the area with phi of 30mm, the defect detection rate is greater than 85%, and the defect false alarm rate is less than 10%.
6. Setting a detection path of the rubber plate with the vocal cavity structure, detecting by stepping by 50mm in a two-dimensional scanning mode according to the diameter phi of a probe by 50mm, and spraying water for coupling in the detection process;
the adsorption type automatic water spraying coupling scanning device is vacuum-adsorbed on the rubber plate, can realize two-dimensional automatic scanning of a single rubber plate, is accurate in positioning and is convenient to scan. The scanning speed is 10 mm/s-100 mm/s, and the scanning interval is 1 mm-20 mm.
During detection, the scanning device is adsorbed around the single rubber plate, the array probe scans along the X axis and the Y axis respectively through the stepping motor, and the scanning path is shown as a line segment in fig. 10.
In the X-axis scanning process, if an array probe is adopted, the rapid scanning of probe coverage is completed through electronic scanning, an arrow in the figure 10, such as twenty array probes of wafers, is numbered as 1, 2/3, … and 20 from left to right in sequence, the number 1 to 10 of wafers are excited for the first time to work, then the number 2 to 11, the number 3 to 12, the number … and the number 11 to 20 are excited, through the electronic scanning, the single-channel ten-time reciprocating scanning can be completed rapidly, so that the y-axis scanning interval is greatly improved, and the detection efficiency is improved.
7. Determining the position, area and depth of the defect through ultrasonic A scanning/ultrasonic B scanning/ultrasonic C scanning; under the existing bonding process conditions, the effective bonding area of the rubber plate with the sound cavity structure is counted, and effective verification is carried out by methods such as plug pulling, destructive inspection and the like.
The rubber plate with the sound cavity structure is an important means for realizing vibration and noise reduction of a ship structure, a mechanical part and the like, and if the bonding surface of the rubber plate has the defects of glue shortage, air gaps and bubbles after bonding, the firmness and the noise elimination performance of the rubber plate are reduced, and even the rubber plate falls off; therefore, the accurate and faultless inspection of the bonding quality of the rubber plate with the vocal cavity structure is the only means for detecting the defects and taking remedial measures.
Through the traditional cork pulling force detection method, the defects of low detection efficiency, small detection coverage area, random sampling detection and the like exist, and meanwhile, the rubber plate body with the acoustic cavity structure is damaged, so that the comprehensive performance of vibration reduction and noise reduction is influenced.
The invention discloses an ultrasonic nondestructive testing method for rubber plate bonding defects with a sound cavity structure, which is characterized in that the physical principle of ultrasonic testing is applied, the relation between the bonding state and the sound field characteristic quantity is established through a bonding structural member based on a single-channel/multi-channel sound testing system, and the signal processing and imaging analysis are carried out, so that the nondestructive testing of the bonding quality of the rubber plate with the sound cavity structure is realized, and the control capability of the acoustic quality after the rubber plate with the sound cavity structure is bonded is improved; the continuity of the bonding of the rubber plate with the vocal cavity structure is ensured, and the integral acoustic function of the material is improved; the method provides the test of the whole-area bonding quality of the rubber plate with the vocal cavity structure, and improves the detection accuracy; the position, the area and the depth of the defect are accurately judged by adopting special detection image analysis and ultrasonic A scanning, ultrasonic B scanning and ultrasonic C scanning, and the early judgment of the bonding defect of the rubber plate with the acoustic cavity structure and the measurement and calculation of the effective bonding area are met.
Claims (1)
1. A rubber plate bonding defect ultrasonic nondestructive testing method with an acoustic cavity structure is characterized in that:
the method is characterized in that the physical principle of ultrasonic detection is applied, based on a single-channel/multi-channel sound detection system, the relation between the bonding state and the sound field characteristic quantity is established through a bonding structural member, the signal is processed and imaged and analyzed, the nondestructive detection method for the bonding defect of the rubber plate with the sound cavity structure is formed, the nondestructive prediction and the acoustic quality control capability of the bonding quality of the rubber plate are realized, and the effective bonding area of the rubber plate is quantified;
1) in order to meet the simulation calculation of an ultrasonic sound field, measuring the acoustics physical parameters influencing the rubber plate material with a sound cavity structure, wherein the measurement mainly comprises the measurement of theoretical sound velocity, attenuation coefficient, ultrasonic attenuation coefficient of a detection center, the average density of the material of the rubber plate and the geometric dimension of the cavity;
2) simulating and calculating an ultrasonic sound field under the bonding state of complete bonding and different bonding states of debonding, establishing a relation between the bonding state and the sound field characteristics, and obtaining a theoretical value of an ultrasonic detection key parameter;
3) accumulating ultrasonic typical signal processing through a detection test, and forming a debonding curve recognition algorithm through signal image characteristic rule analysis;
4) manufacturing test pieces with different bonding defect sizes, and accumulating ultrasonic echo signals and images in different bonding states through different manual bonding test pieces to form an effective method for identifying debonding defects;
5) the detection results of the manually bonded test pieces of different materials, different thicknesses and different depths are evaluated, and the detection capability of the defect detection rate and the false alarm rate is evaluated;
6) setting a detection path of the rubber plate, performing detection by stepping by 50mm in a two-dimensional scanning mode according to the diameter of 50mm of the probe, and performing water spray coupling in the detection process;
7) determining the position, area and depth of the defect through ultrasonic A scanning/ultrasonic B scanning/ultrasonic C scanning; counting the effective bonding area of the rubber plate, and determining a test criterion;
the specific implementation mode comprises the following steps:
1) measuring the acoustics physical parameters of the rubber plate material with the vocal cavity structure:
a) and (3) sound velocity value measurement:
evenly select five different positions of the rubber sheet material of vocal cavity structure (1), place the both sides of sample in with two transducers, adopt the method of sending out one and receiving to carry out the ultrasonic measurement of the rubber sheet material of vocal cavity structure, the theoretical sound velocity v of obtaining the rubber sheet of vocal cavity structure is:
v = T/T, wherein T is the thickness of a rubber plate with a vocal cavity structure, and T is the time T of a first received pulse signal;
averaging the five positions to obtain a sound velocity value;
V=∑V1,V2…V5/5；
b) ultrasonic attenuation coefficient measurement:
choose the rubber slab material 50mm 80mm of two different thickness vocal cavity structures (1) for detecting the sample, evenly select five different positions, place the both sides of sample in with two transducers, adopt one to send one to receive and carry out the attenuation coefficient measurement of the rubber slab material of vocal cavity structure, the rubber slab attenuation coefficient that obtains vocal cavity structure is alpha:
α =20lg (| a1-a2 |/max (a1, a 2)/(| T1-T2 |), wherein the first specimen thickness is T1 and the transmission amplitude is a1, and the second specimen thickness is T2 and the transmission amplitude is a 2;
α=∑α1,α2…α5/5；
c) the average density of the material of the rubber plate with the acoustic cavity structure and the geometric dimension of the acoustic cavity structure (1) can be directly input; apparent density 1.1Kg/m3；
2) Simulation model sound field parameter input
Analyzing the sound wave propagation rule of the multilayer medium of the rubber plate with the sound cavity structure by utilizing the layered medium propagation theory; assuming that the rubber plate with the acoustic cavity structure is of a multilayer structure, all media in the material are isotropic media, and deducing an acoustic wave reflection coefficient expression (formula (1)) of an n-layer structure system:
wherein r isn=(ZNDL-Zn+1)/(Zn+Zn+1) Is the reflection coefficient of the interface of the (n + 1) th layer medium, RNDL-1(f) The reflection coefficient obtained by the normal incidence of the sound wave on the whole system from the interface of the nth layer medium and the NDL-1 layer, R0=r0=（Z0-Z1）/( Z0+Z1)， Zn=ρncnRepresenting the specific acoustic impedance of the nth layer of medium; t is tn=dn/cnWhen acoustic, it represents the time for an acoustic wave to travel in a single pass through the medium; equivalent attenuation factor alphan=βncn/2 π f, representing the complex wave number Kn=Kn ’+j Kn ’’Ratio of imaginary real parts of Kn ’’/ Kn ’；
3) Identification of a debonding curve
Using a Gaussian signal as the incident sound wave XInThe simulation signal (equation 2):
wherein f is0In order to detect the acoustic wave center frequency, B is the bandwidth coefficient, ψ is the initial phase, and t is time, the detection output signal obtained from equations (1) (2) is:
y(t)=IFFT(FFT(Xin（t）)R(w))
changing the state of a bonding interface, and providing judgment of air debonding harmonic ratio to obtain the sound wave propagation rule under different bonding conditions (good bonding and debonding);
4) the detection imaging of the ultrasonic A scanning (2), the ultrasonic B scanning (3) and the ultrasonic C scanning (4) meets the accurate scanning of the position, the depth and the area of the defect;
manufacturing an artificial bonding piece (5), arranging artificial defects (6) with different diameters from phi 30-50 mm at an interface combined with a steel plate, accumulating ultrasonic echo signals and images in different bonding states, and forming an effective method for identifying debonding defects;
5) the detection results of the manually bonded test pieces of different materials, different thicknesses and different depths are evaluated, and the detection capability of the defect detection rate and the false alarm rate is evaluated;
manufacturing a rubber plate with 50mm thickness and 80mm thickness and having a vocal cavity structure to bond an artificial sample, wherein the defect meets the requirement of minimum identification of an area with phi of 30mm, the defect detection rate is more than 85%, and the defect false alarm rate is less than 10%;
6) setting a detection path of the rubber plate with the vocal cavity structure (1), stepping by 50mm in a two-dimensional scanning mode according to the phi 50mm of a probe, and scanning the probe along scanning paths (7) of an X axis and a Y axis respectively through a stepping motor; in the X-axis scanning process, if an array probe is adopted, the rapid scanning of probe coverage is completed through electronic scanning, for example, the array probes of twenty wafers are numbered as 1, 2/3, … and 20 from left to right, the number 1 to 10 wafers are excited for the first time to work, then the number 2 to 11, the number 3 to 12, the number … and the number 11 to 20 are excited, and through the electronic scanning, the single-channel ten-time reciprocating scanning can be completed rapidly;
7) determining the position, area and depth of the defect through ultrasonic A scanning/ultrasonic B scanning/ultrasonic C scanning; under the existing bonding process conditions, the effective bonding area of the rubber plate with the vocal cavity structure is counted, and effective verification is carried out by methods such as plug pulling, destructive inspection and the like.
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