CN112051331A - Ultrasonic guided wave transducer support capable of moving along axial direction of cylinder, support device and cylinder detection method - Google Patents
Ultrasonic guided wave transducer support capable of moving along axial direction of cylinder, support device and cylinder detection method Download PDFInfo
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- 238000005516 engineering process Methods 0.000 abstract description 4
- 238000006073 displacement reaction Methods 0.000 abstract description 2
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- 230000002238 attenuated effect Effects 0.000 description 1
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- 238000005260 corrosion Methods 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
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- 238000009659 non-destructive testing Methods 0.000 description 1
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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
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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
- G01N29/22—Details, e.g. general constructional or apparatus details
- G01N29/24—Probes
- G01N29/2462—Probes with waveguides, e.g. SAW devices
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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
- G01N29/22—Details, e.g. general constructional or apparatus details
- G01N29/26—Arrangements for orientation or scanning by relative movement of the head and the sensor
- G01N29/265—Arrangements for orientation or scanning by relative movement of the head and the sensor by moving the sensor relative to a stationary material
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- G—PHYSICS
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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
- G01N29/44—Processing the detected response signal, e.g. electronic circuits specially adapted therefor
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- G—PHYSICS
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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
- G01N29/44—Processing the detected response signal, e.g. electronic circuits specially adapted therefor
- G01N29/46—Processing the detected response signal, e.g. electronic circuits specially adapted therefor by spectral analysis, e.g. Fourier analysis or wavelet analysis
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- G—PHYSICS
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- G01N2291/028—Material parameters
- G01N2291/0289—Internal structure, e.g. defects, grain size, texture
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
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- G01N2291/044—Internal reflections (echoes), e.g. on walls or defects
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Abstract
An ultrasonic guided wave transducer support capable of moving along the axial direction of a cylinder, a supporting device and a cylinder detection method relate to the technical field of nondestructive detection. The invention aims to solve the problems of low detection precision and low resolution when an ultrasonic guided wave detection technology is used for detecting an ultra-long size component in the practical engineering application process. The utility model provides a can follow ultrasonic guided wave transducer support of cylinder axial displacement, its trunk portion terminal surface is ring fan-shaped, the coil groove that has both ends to link up is opened along its circumference in the middle part of the outer anchor ring of trunk portion, a recess has been opened respectively to the both sides of coil groove, two passageways have been opened along its circumference to the trunk portion, two passageways are located the outside of two recesses respectively, the interior anchor ring of trunk portion is equipped with two sets of roller trains, two sets of roller trains are located the outside of two passageways respectively, every roller train includes two at least gyro wheels.
Description
Technical Field
The invention belongs to the technical field of nondestructive testing, and particularly relates to an ultrasonic transducer.
Background
Ultrasonic guided waves are ultrasonic waves that can propagate within structural members having limited boundaries, such as sheets, pipes, rods, and the like. The ultrasonic guided wave can propagate over a long distance and a wide range in the above structure, compared to the ultrasonic bulk wave. When a minute defect or damage of the structure is encountered, wave scattering or reflection occurs at the defect in addition to a part that continues to propagate. Therefore, analyzing the characteristics of the various source waves can identify minute defects or damage to the structure. Further, the defects can be localized, quantified, or even imaged based on the analysis. The structure damage identification method based on the ultrasonic guided waves is sensitive to local tiny defects of the structure, can detect a wider range and a longer distance compared with the traditional ultrasonic nondestructive detection, and is one of the structural nondestructive detection methods which are widely concerned, researched and applied at present.
Although the guided wave detection technology can detect a wider range and a longer distance, in the practical engineering application process, the length of an engineering component generally far exceeds the length and other dimensions of a laboratory model test piece, and the guided wave is obviously attenuated in the long-distance propagation process, so that the signal-to-noise ratio of the guided wave signal received by the ultrasonic guided wave transducer is obviously reduced, the difficulty of extracting damage information of a long distance part from the guided wave signal is greatly increased, the structural defect identification and positioning accuracy is reduced, and even the damage cannot be identified. The problem greatly limits the application of the ultrasonic guided wave detection technology in the actual engineering super-long dimension component. Typical problems such as ultrasonic guided wave detection of long-distance pipelines are that small-size defects are difficult to detect when the size of the defects exceeds more than two hundred meters under ideal conditions; as long stay cables, the length often exceeds two hundred meters. At this time, under the influence of noise, the ultrasonic guided wave method has low detection accuracy and resolution for defects such as corrosion and wire breakage in the ultrasonic guided wave method. In order to improve the damage identification capability and the positioning accuracy based on the ultrasonic guided wave method, a great number of researchers have proposed various methods, including increasing the input energy of a transducer, using an ultrasonic guided wave phased array, various guided wave signal processing methods, and the like, but these similar methods are still obviously insufficient in solving the problem exceeding the physical limit.
Disclosure of Invention
The invention provides an ultrasonic guided wave transducer support capable of moving along the axial direction of a cylinder, a supporting device and a cylinder detection method, aiming at solving the problems of low detection precision and low resolution when an ultrasonic guided wave detection technology is used for detecting an ultra-long component in the practical engineering application process.
The utility model provides a can follow cylinder axial displacement's ultrasonic guided wave transducer support, its trunk portion is the bar body structure, the terminal surface of this bar body structure is the ring sector, open the coil groove that has both ends to link up along its circumference in the middle part of the outer anchor ring of trunk portion, open a recess respectively in the both sides of coil groove, the trunk portion is opened along its circumference has two passageways, two passageways are located the outside of two recesses respectively, the interior anchor ring of trunk portion is equipped with two sets of roller groups, two sets of roller groups are located the outside of two passageways respectively, every roller group includes two at least gyro wheels.
The roller comprises a shell and a one-way wheel, the shell is embedded in the inner ring surface of the trunk portion, the shell is provided with a rectangular opening, the one-way wheel is located inside the shell, and the circumferential surface of the one-way wheel protrudes out of the rectangular opening.
The housing is connected to the inner annular surface of the stem portion by a spring.
The supporting device with the ultrasonic guided wave transducer support comprises at least N ultrasonic guided wave transducer supports and 2M connecting strips, wherein N is an integer greater than or equal to 2, M is an integer greater than or equal to 1, and the connecting strips can penetrate through a channel of the ultrasonic guided wave transducer support and connect the N ultrasonic guided wave transducer supports in series, so that the N ultrasonic guided wave transducer supports and the connecting strips can surround to form a closed circle.
The supporting device further comprises a traction device, and the traction device is connected with the end face of any ultrasonic guided wave transducer support in the supporting device.
The traction device is a cable climbing robot.
The cylinder detection method based on the supporting device comprises the following steps:
selecting ultrasonic guided wave transducer supports with the same number as the ultrasonic guided wave transducers, uniformly arranging all the ultrasonic guided wave transducer supports along the circumferential direction of a cylinder to be detected, connecting the inner ring surface of each ultrasonic guided wave transducer support with the outer circumference of the cylinder to be detected in a butt joint mode, connecting all the ultrasonic guided wave transducer supports in series by using connecting strips, simultaneously winding coils on all the ultrasonic guided wave transducer supports, enabling the coils to be located in coil grooves of the ultrasonic guided wave transducer supports, and respectively inserting two ends of a bias magnet in each ultrasonic guided wave transducer into two grooves of the corresponding ultrasonic guided wave transducer support;
and step two, driving the supporting device to move axially along the measured cylinder, simultaneously starting the ultrasonic guided wave transducer to send guided wave signals, and collecting reflected guided wave signals at different positions of the measured cylinder to realize the detection of the cylinder.
The invention designs an ultrasonic guided wave transducer bracket capable of axially moving along a cylinder aiming at a magnetostrictive ultrasonic guided wave transducer commonly used in practical engineering and mainly aiming at cylindrical components such as pipelines, stay cables and the like. The transducer structure is combined with the existing transducer structure based on the magnetostrictive principle, and the transducer can move along the length direction of the member, so that the defect detection distance is expanded, and the signal-to-noise ratio of the received guided wave signal is substantially increased. Defects are further identified and determined by analysis of the defect signals. The influence of the ultrasonic guided wave on excitation and reception of ultrasonic guided wave signals is reduced as much as possible, and the defect identification capability is effectively improved by combining a signal analysis method.
Meanwhile, the existing magnetostrictive transducers for cylindrical components are all fixedly installed, and because a plurality of bias magnets are large in mass and strong in magnetism, time is consumed for installation every time. The ultrasonic guided wave transducer support is connected with a plurality of ultrasonic guided wave transducer supports to form a supporting device surrounding the outer circumference of a detected structure, and meanwhile, the ultrasonic guided wave transducer support is combined with a traction device, can gradually move along a detected member to approach a detected area, conveniently and quickly changes the position of the transducer, realizes approach detection of any position in a long distance range, and acquires a defect detection signal with high signal-to-noise ratio. The invention can effectively solve the problem of nondestructive detection of remote tiny defects in the existing component, and provides accurate and reliable internal defect information for safety assessment and maintenance reinforcement of an actual engineering structure.
Drawings
FIG. 1 is a front view of an ultrasonic guided wave transducer holder capable of moving along the axial direction of a cylinder according to the present invention;
FIG. 2 is a schematic end view of an ultrasonic guided wave transducer holder capable of moving along the axial direction of a cylinder according to the present invention;
FIG. 3 is a side view of an ultrasonic guided wave transducer holder of the present invention movable in the axial direction of a cylinder;
FIG. 4 is a schematic end view of the support device of the present invention mounted on a cylinder under test;
FIG. 5 is a schematic view of a biasing magnet;
FIG. 6 is a schematic end view of the support device with the offset magnet mounted thereon mounted on the cylinder under test;
FIG. 7 is a side view of the support device with the offset magnet mounted thereon mounted on the cylinder under test;
FIG. 8 is a schematic view of the support device in an operational state when connected to the towing device;
FIG. 9 is a graph of ultrasonic guided wave reflected signal curves of a triple motion ultrasonic transducer for a suspected same defect;
figure 10 is a graph of distance versus amplitude for an ultrasonic guided wave.
Detailed Description
The first embodiment is as follows: the present embodiment is specifically described with reference to fig. 1 to 3, and the trunk portion of the ultrasonic guided wave transducer holder capable of moving along the axial direction of the cylinder in the present embodiment is a strip-shaped body structure, and the end face of the strip-shaped body structure is in a ring sector shape. The middle part of the outer ring surface of the main part is provided with a coil slot 4 with two through ends along the circumferential direction, and two sides of the coil slot 4 are respectively provided with a groove 3. The trunk part is provided with two channels 2 along the circumferential direction, and the two channels 2 are respectively positioned at the outer sides of the two grooves 3. Two groups of roller sets are arranged on the inner ring surface of the main part, the two groups of roller sets are respectively positioned on the outer sides of the two channels 2, and each roller set comprises at least two rollers 1.
Further, gyro wheel 1 includes casing and one-way wheel, and the casing inlays in the interior anchor ring of trunk portion, and the casing is equipped with the rectangle opening, and one-way wheel is located the casing inside, and the periphery of one-way wheel salient in rectangle opening. The housing is connected to the inner annular surface of the stem portion by a spring 5.
The second embodiment is as follows: the present embodiment is specifically described with reference to fig. 4 to 8, and the present embodiment is a supporting device including the ultrasonic guided wave transducer holder which can move along the axial direction of the cylinder according to the present embodiment, the supporting device includes at least N ultrasonic guided wave transducer holders, 2M connecting strips 6 and a traction device 8, N is an integer greater than or equal to 2, and M is an integer greater than or equal to 1.
The connecting strip 6 can penetrate through the channel 2 of the ultrasonic guided wave transducer support and connect the N ultrasonic guided wave transducer supports in series, so that the N ultrasonic guided wave transducer supports and the connecting strip 6 can enclose a closed circle. The traction device 8 is connected with the end face of any ultrasonic guided wave transducer bracket in the supporting device. In particular, the traction device 8 may be a cable climbing robot.
The supporting device mentioned in the embodiment is composed of a plurality of separated ultrasonic guided wave transducer brackets which can move along the axial direction of the cylinder. The roller 1 with the spring 5 can support the whole ultrasonic guided wave transducer to move axially along the tested cylinder 11. The size of the roller 1 protruding beyond the inner ring surface determines the lift-off distance of the bias magnet 9 in the magnetostrictive transducer, which is not preferably too large. Theoretically, increasing the lift-off distance between the core components of the magnetostrictive ultrasonic transducer, namely the bias magnet and the coil, can reduce the energy conversion efficiency between magnetic sound and shorten the effective detection distance of ultrasonic guided waves. Research shows that the influence of the lifting distance of 1mm on the signal intensity is small, so that effective ultrasonic guided wave signals can be still excited and received inwards along the axial direction of the cylinder at a certain detection distance by increasing the lifting distance in a certain range along the radial direction of the cylinder.
The channel 2 is used to pass through a connecting strip 6 connecting a plurality of brackets. As shown in fig. 4, a screw hole may be formed at an end position of the connection bar 6, and adjacent two connection bars 6 are connected to each other through the screw hole by a screw 7. As shown in fig. 5, the bias magnet 9 has a single-sided middle bracket shape. The grooves 3 are used for embedding the bias magnet 9 in the magnetostrictive transducer, namely, two ends of the bias magnet 9 are respectively inserted into the two grooves 3 of one bracket, which is helpful for keeping the whole transducer stable. The area located on the inner annular surface of the coil slot 4 is close to the cylinder 11 to be measured. As shown in fig. 7, a coil 12 for generating an alternating current in the magnetostrictive transducer is wound in the coil slot 4. The thickness of the bottom of the coil slot 4 is smaller to reduce the distance between the coil 12 and the measured cylinder 11.
Since the cylinders 11 to be measured may have different diameters. Therefore, the movable support is firstly designed according to the radius of the cylinder, and the bending radius of the inner surface of the support is consistent with the radius of the measured structure to the greatest extent. When the difference between the bending radius of the inner surface of the bracket and the radius of the structure to be measured is not large, the distance between the inner annular surface of the bracket and the structure to be measured is adjusted through the spring 5. Namely, when the measured cylinder 11 is uneven, the outer circumferential surface of the one-way wheel of the bracket can always keep in contact with the surface of the measured structure under the action of the spring 5.
Further, in practical applications, as shown in fig. 8, the traction device 8 is connected to the end face of any one of the ultrasonic guided wave transducer holders in the supporting device, or the magnetostrictive ultrasonic transducer 10 is connected to the traction device 8. The traction device 8 is currently applied to actual engineering and is mainly used for a cable climbing robot and the like. The magnetostrictive ultrasonic transducer 10 and the supporting device are moved together along the length direction of the measured cylinder 11 through the traction device 8. The magnetostrictive ultrasonic guided wave transducer which can be integrally moved is obtained by the method. When the ultrasonic guided wave test device is applied, firstly, ultrasonic guided wave excitation and receiving are carried out at one end of a tested structure, and received ultrasonic guided wave signals are analyzed. And then, after moving for a certain distance along the length direction of the structure to be measured through the traction device, carrying out ultrasonic guided wave excitation and receiving, and analyzing the received ultrasonic guided wave signals. Until it moves to the end near the other end of the structure to be tested. In the detection process, if a suspected defect reflection signal is obtained, the position of the ultrasonic transducer is moved for multiple times, the multiple reflection signal is compared and checked through an amplitude-distance curve of ultrasonic guided waves, and the defect is finally determined.
In the two embodiments, each part carrying the magnetostrictive transducer moves along the axial direction of the cylinder to gradually approach the defect area, detection signals with high signal-to-noise ratio are obtained from different distances, and the accuracy and reliability of internal defect analysis are improved by comparing, analyzing, checking and determining the defect signals. The movable ultrasonic guided wave transducer bracket is mainly designed by considering the following aspects:
1) because the end part of the actual engineering structure is not a free end in general, the bracket can be installed at any position of the cylinder to be measured, namely, the bracket does not need to be installed from the end part;
2) ensuring the lifting distance of the transducer core component as small as possible;
3) can move in one direction along the axial direction through the rolling component;
4) the cylinder is uniformly distributed on the outer surface of the cylinder in a discrete mode;
5) can be connected with a traction device;
6) the method is suitable for the tested structures with different diameters;
7) the field installation and disassembly are convenient.
The third concrete implementation mode: this embodiment will be described in detail with reference to fig. 9 and 10, and is a cylindrical body detection method based on the supporting device according to the second embodiment, and the embodiment includes the following steps:
step one, selecting ultrasonic guided wave transducer brackets with the number consistent with that of the ultrasonic guided wave transducers,
all the ultrasonic guided wave transducer brackets are uniformly arranged along the circumferential direction of the cylinder 11 to be measured, the inner ring surface of each ultrasonic guided wave transducer bracket is connected with the outer circumference of the cylinder 11 to be measured in a butt joint mode, all the ultrasonic guided wave transducer brackets are connected in series by using the connecting strips 6,
the coil 12 is wound on all the ultrasonic guided wave transducer supports at the same time, the coil 12 is positioned in the coil groove 4 of the ultrasonic guided wave transducer supports,
two ends of a bias magnet 9 in the ultrasonic guided wave transducer are respectively inserted into two grooves 3 of corresponding ultrasonic guided wave transducer brackets;
and step two, driving the supporting device to move axially along the cylinder 11 to be detected, starting the ultrasonic guided wave transducer to send guided wave signals, and collecting reflected guided wave signals at different positions of the cylinder 11 to be detected, so as to realize the detection of the cylinder.
Figure 9 shows reflected guided wave signals for the same suspected defect at three different locations. In fig. 9, the highest part is the defect reflection signal measured at the farthest position, and the following two groups of guided wave signals are measured at positions gradually approaching the suspected defect. The amplitude of the three guided wave signals is extracted and compared with the amplitude-distance curve in fig. 10. The amplitude and distance data of the guided wave reflected signal excited by the ultrasonic transducer at three positions by the suspected same defect from far to near are plotted in the graph 10, if three amplitudes A1、A2And A3If the magnitude of the guided wave reflected signal is consistent with the curve relation in fig. 10, the guided wave reflected signals measured for multiple times are considered to correspond to the same defect; if the curve is not in a significant match, the measurement noise is considered. The same defect is checked through the above process.
Claims (7)
1. An ultrasonic guided wave transducer bracket capable of moving along the axial direction of a cylinder is characterized in that the trunk part of the ultrasonic guided wave transducer bracket is of a strip-shaped body structure, the end surface of the strip-shaped body structure is of a ring sector shape,
the middle part of the outer ring surface of the main part is provided with a coil groove (4) with two through ends along the circumferential direction, two sides of the coil groove (4) are respectively provided with a groove (3),
the main part is provided with two channels (2) along the circumferential direction, the two channels (2) are respectively positioned at the outer sides of the two grooves (3),
two groups of roller groups are arranged on the inner ring surface of the main part, the two groups of roller groups are respectively positioned on the outer sides of the two channels (2), and each roller group comprises at least two rollers (1).
2. The ultrasonic guided wave transducer support capable of moving along the axial direction of the cylinder is characterized in that the roller (1) comprises a shell and a one-way wheel, the shell is embedded in the inner annular surface of the trunk part,
the shell is provided with a rectangular opening, the one-way wheel is positioned in the shell, and the circumferential surface of the one-way wheel protrudes out of the rectangular opening.
3. The ultrasonic guided wave transducer holder capable of moving along the axial direction of the cylinder according to claim 2, wherein the housing is connected with the inner annular surface of the trunk part through a spring (5).
4. A support device containing the ultrasonic guided wave transducer holder of claim 1, 2 or 3, characterized by comprising at least N ultrasonic guided wave transducer holders and 2M connecting strips (6), N being an integer greater than or equal to 2, M being an integer greater than or equal to 1,
the connecting strip (6) can penetrate through the channel (2) of the ultrasonic guided wave transducer support and connect the N ultrasonic guided wave transducer supports in series, so that the N ultrasonic guided wave transducer supports and the connecting strip (6) can surround to form a closed circle.
5. A support device according to claim 4, further comprising a traction device (8), wherein the traction device (8) is connected with the end face of any one ultrasonic guided wave transducer bracket in the support device.
6. Support device according to claim 5, characterized in that the traction device (8) is a cable climbing robot.
7. The cylinder detection method based on the supporting device of claim 4, characterized by comprising the following steps:
step one, selecting ultrasonic guided wave transducer brackets with the number consistent with that of the ultrasonic guided wave transducers,
all the ultrasonic guided wave transducer brackets are uniformly arranged along the circumferential direction of the cylinder (11) to be measured, the inner ring surface of each ultrasonic guided wave transducer bracket is connected with the outer circumference of the cylinder (11) to be measured in a butt joint mode, all the ultrasonic guided wave transducer brackets are connected in series by using the connecting strips (6),
the coil (12) is wound on all the ultrasonic guided wave transducer supports at the same time, the coil (12) is positioned in the coil groove (4) of the ultrasonic guided wave transducer supports,
two ends of a bias magnet (9) in the ultrasonic guided wave transducer are respectively inserted into two grooves (3) of corresponding ultrasonic guided wave transducer brackets;
and step two, driving the supporting device to move axially along the measured cylinder (11), simultaneously starting the ultrasonic guided wave transducer to send guided wave signals, and collecting reflected guided wave signals at different positions of the measured cylinder (11) to realize the detection of the cylinder.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010961133.0A CN112051331A (en) | 2020-09-14 | 2020-09-14 | Ultrasonic guided wave transducer support capable of moving along axial direction of cylinder, support device and cylinder detection method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010961133.0A CN112051331A (en) | 2020-09-14 | 2020-09-14 | Ultrasonic guided wave transducer support capable of moving along axial direction of cylinder, support device and cylinder detection method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000041517A2 (en) * | 1999-01-11 | 2000-07-20 | Westinghouse Savannah River Company | Techniques and equipment for assessing the structural integrity of subterranean tower anchor rods |
| EP1811290A2 (en) * | 2006-01-20 | 2007-07-25 | University Of Virginia Patent Foundation | High mast inspection system, equipment and method |
| CN102590351A (en) * | 2012-01-18 | 2012-07-18 | 中国航空工业集团公司北京航空制造工程研究所 | Ultrasonic transducer clamp for detecting concave R region of composite material structure |
| CN106198718A (en) * | 2016-06-30 | 2016-12-07 | 重庆交通大学 | Drag-line corrosion sites based on metal magnetic memory detection device and method |
| CN108776178A (en) * | 2018-05-14 | 2018-11-09 | 南京航空航天大学 | A kind of electromagnet ultrasonic changer and its working method for exciting pipeline torsion guided wave |
-
2020
- 2020-09-14 CN CN202010961133.0A patent/CN112051331A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000041517A2 (en) * | 1999-01-11 | 2000-07-20 | Westinghouse Savannah River Company | Techniques and equipment for assessing the structural integrity of subterranean tower anchor rods |
| EP1811290A2 (en) * | 2006-01-20 | 2007-07-25 | University Of Virginia Patent Foundation | High mast inspection system, equipment and method |
| CN102590351A (en) * | 2012-01-18 | 2012-07-18 | 中国航空工业集团公司北京航空制造工程研究所 | Ultrasonic transducer clamp for detecting concave R region of composite material structure |
| CN106198718A (en) * | 2016-06-30 | 2016-12-07 | 重庆交通大学 | Drag-line corrosion sites based on metal magnetic memory detection device and method |
| CN108776178A (en) * | 2018-05-14 | 2018-11-09 | 南京航空航天大学 | A kind of electromagnet ultrasonic changer and its working method for exciting pipeline torsion guided wave |
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