Method and device for detecting dry bushing, computer device and storage medium

Abstract

This application relates to a method, apparatus, computer equipment, storage medium, and computer program product for testing dry bushings. The method includes: performing ultrasonic scanning tests on multiple dry bushing samples to be tested, and determining a first scanning result; the first scanning result is used to indicate whether each of the multiple dry bushing samples to be tested has damage; based on the first scanning result, determining a target sample and its damaged area; the target sample is the sample with damage among the multiple dry bushing samples to be tested; performing X-ray scanning tests on the fracture surface of the damaged area to obtain a second scanning result; the second scanning result is used to indicate the damage status of the target sample. This solution combines the advantages of ultrasonic scanning, which can conveniently and quickly locate the damage location, and X-ray scanning, which can accurately reflect the degree of damage, thus achieving the technical effect of quickly locating the damage location and accurately measuring the internal damage status of the material.

Description

Technical Field

[0001] This application relates to the field of composite material testing technology, and in particular to a testing method, apparatus, computer equipment, storage medium, and computer program product for dry sleeves. Background Technology

[0002] The mechanical properties of dry bushing capacitor core materials have a significant impact on the service life and safety of the bushing during application. Currently, research on the mechanical property testing and internal damage characteristics of dry bushing core composite materials is relatively limited. Commonly used mechanical property tests, such as tensile and bending tests, can reflect macroscopic information such as failure load and stress-strain curves, but they cannot accurately reflect minute internal damage changes. Methods for detecting microscopic damage within materials can be divided into two types: destructive testing and non-destructive testing. Destructive testing, such as scanning electron microscopy, requires cutting and preparing samples from the material cross-section, which damages the material and is unsuitable for studying internal damage in dry bushing capacitor cores. Non-destructive testing can detect internal damage without destroying the material.

[0003] Ultrasonic testing is a common non-destructive testing method. However, although ultrasonic testing can quickly locate the damaged area, it cannot accurately determine the specific damage, resulting in low testing accuracy. Summary of the Invention

[0004] Therefore, it is necessary to provide a method, apparatus, computer equipment, computer-readable storage medium, and computer program product for detecting dry bushings that can improve detection accuracy, in order to address the above-mentioned technical problems.

[0005] In a first aspect, this application provides a method for testing dry casing. The method includes: performing ultrasonic scanning tests on multiple dry casing samples to be tested, and determining a first scanning result; the first scanning result is used to indicate whether each of the multiple dry casing samples to be tested has damage; based on the first scanning result, determining a target sample and a damaged area of ​​the target sample; the target sample is the sample with damage among the multiple dry casing samples to be tested; performing X-ray scanning tests on the tomographic area of ​​the damaged region to obtain a second scanning result; the second scanning result is used to indicate the damage status of the target sample.

[0006] In one embodiment, the above method may further include the following steps: performing graded load tests on the target sample, and performing acoustic emission tests on the target sample at each graded load test stage to obtain a first test result; and determining the damage level of the target sample based on the second scan result and the first test result.

[0007] In one embodiment, the first experimental results are represented by a curve showing the trend of cumulative energy over time; the slope of the curve is positively correlated with the damage level.

[0008] In one embodiment, the second scan result is a two-dimensional grayscale image; when determining the damage level of the target sample based on the second scan result and the first test result, the following steps may be included: performing three-dimensional reconstruction processing on the second scan result to obtain a three-dimensional image of the second scan result; determining the damage level based on the crack situation presented in the three-dimensional image of the second scan result and the first test result; the crack situation is positively correlated with the damage level.

[0009] In one embodiment, the curve of the cumulative energy changing over time is obtained by linearly fitting the cumulative energy and time using a piecewise low-order interpolation polynomial.

[0010] In one embodiment, when performing three-dimensional reconstruction processing on the second scan result to obtain a three-dimensional image of the second scan result, the following operations can be performed: preprocessing the two-dimensional grayscale image to obtain a processed two-dimensional grayscale image; performing three-dimensional reconstruction processing on the processed two-dimensional grayscale image to obtain a three-dimensional image.

[0011] In one embodiment, the load gradient of the graded load-holding test is obtained based on the maximum destructive load, which is obtained by performing a tensile test on any one of the non-target specimens among a plurality of dry casing specimens to be tested.

[0012] Secondly, this application also provides a detection device for dry bushings, which includes modules capable of implementing the method of the first aspect and any of its implementations.

[0013] In one embodiment, the device includes:

[0014] The first testing module is used to perform ultrasonic scanning tests on multiple dry sleeve samples to be tested and determine the first scanning result; the first scanning result is used to indicate whether each of the multiple dry sleeve samples to be tested has damage.

[0015] The processing module is used to determine the target sample and the damaged area of ​​the target sample based on the first scan result; the target sample is a sample with damage among multiple dry sleeve samples to be tested.

[0016] The second testing module is used to perform X-ray scanning tests on the fracture site of the damaged area to obtain the second scanning result; the second scanning result is used to indicate the damage status of the target dry casing.

[0017] Thirdly, this application also provides a computer device. The computer device includes a memory and a processor, the memory storing a computer program, and the processor, when executing the computer program, is capable of implementing the method of the first aspect and any of its implementations.

[0018] Fourthly, this application also provides a computer-readable storage medium. This computer-readable storage medium stores a computer program, which, when executed by a processor, can implement the method of the first aspect and any of its implementations.

[0019] Fifthly, this application also provides a computer program product. This computer program product includes a computer program that, when executed by a processor, can implement the method of the first aspect and any of its implementations.

[0020] The aforementioned dry bushing detection method, apparatus, computer equipment, storage medium, and computer program product utilize ultrasonic scanning to locate the damaged area and X-ray scanning to determine the specific damage condition. This combines the advantages of ultrasonic scanning, which can conveniently and quickly locate the damage location, and X-ray scanning, which can accurately reflect the degree of damage. Therefore, it can achieve the technical effect of quickly locating the damage location and accurately measuring the damage condition inside the material. Attached Figure Description

[0021] Figure 1 This is a schematic flowchart illustrating a method for detecting a dry bushing according to an embodiment of this application.

[0022] Figure 2 This is an exemplary physical image of the dry sleeve sample to be tested according to an embodiment of this application.

[0023] Figure 3 This is a schematic flowchart illustrating another method for detecting dry bushings according to an embodiment of this application.

[0024] Figure 4 This is a schematic diagram of the cumulative energy change over time according to an embodiment of this application.

[0025] Figure 5 This is a schematic structural diagram of a dry bushing detection device according to an embodiment of this application.

[0026] Figure 6 This is an internal structural diagram of a computer device according to an embodiment of this application. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0028] In one embodiment, such as Figure 1 As shown, a method for detecting dry bushings is provided. The method includes the following steps:

[0029] Step 101: Perform ultrasonic scanning tests on multiple dry sleeve samples to be tested and determine the first scan result.

[0030] The first scan result is used to indicate whether each of the multiple dry sleeve samples to be tested is damaged.

[0031] Ultrasonic scanning includes various scanning methods such as A-scan, B-scan, and C-scan. A-scan can be considered a point scan, processing the received ultrasound signals into a waveform image for display. The shape of the waveform reveals defects within the object being tested. B-scan can be considered a line scan, combining multiple parallel lines of grayscale-processed detection information into a two-dimensional image, reflecting the internal cross-sectional structure of the object being tested. Medical ultrasound uses the B-scan method. C-scan can be considered a planar scan, creating an image based on the waveform heights of multiple A-scans. C-scan images clearly and intuitively show the outline and severity of defects.

[0032] In this embodiment of the application, the ultrasound scan can be an ultrasound C-scan. In some implementations, step 101 can be performed using an ultrasound C-scan device.

[0033] Optionally, during step 101, zero load can be applied to the multiple dry sleeve samples to be tested. In other words, the execution of step 101 (i.e., the ultrasonic scanning process) is a static process, without applying any load to the test samples. This ensures the accuracy of the scanning results.

[0034] The execution of step 101 can scan and obtain the first scan result, which is a grayscale image. Through this grayscale image, it can be seen whether there is damage to each dry sleeve sample to be tested, and further the internal damage area of ​​each sample can be seen.

[0035] In other words, the purpose of step 101 is to distinguish between damaged and undamaged samples.

[0036] The composite material for dry bushing capacitor cores is made by alternately rolling aluminum foil and crepe paper around a central guide rod in multiple layers, followed by casting epoxy resin under vacuum. The aforementioned dry bushing specimens to be tested can be prepared according to the tensile test requirements in the national standard GB / T 2567-2008, for example, they can be prepared as follows: Figure 2 The dumbbell-shaped specimen shown.

[0037] In some implementations, the dry sleeve sample to be tested can be as shown in Table 1 below.

[0038] Table 1

[0039]

[0040] Step 102: Based on the first scan result, determine the target sample and the damage area of ​​the target sample.

[0041] The target sample is a damaged sample among multiple dry sleeve samples to be tested.

[0042] In other words, the purpose of step 102 is to screen out damaged samples and identify the specific damaged areas (the location of the damage).

[0043] Step 103: Perform X-ray scanning test on the fracture site of the damaged area to obtain the second scan result.

[0044] The second scan result is used to indicate the damage status of the target sample.

[0045] Step 103 can be performed using an X-ray computed tomography (CT) device. After turning on the X-ray computed tomography device, adjust the X-ray, the voltage and current values ​​of the X-ray tube, the pixel value of the ring detector, and the exposure time, etc. The internal damage image of the sample obtained by scanning (the second scan result) should be clearly visible.

[0046] In other words, step 103 aims to determine the specific damage condition (degree of damage) of the damaged area. This step leverages the advantage of X-rays in damage detection of composite materials, namely, their ability to accurately distinguish differences between damages. By performing step 103 based on steps 101 and 102, the disadvantage of X-rays in damage detection of composite materials—namely, their inability to quickly locate the damage—is also avoided.

[0047] In the above-mentioned dry sleeve detection method, ultrasonic scanning is used to locate the damaged area, and X-ray scanning is used to determine the specific damage. This method combines the advantages of ultrasonic scanning, which can quickly and easily locate the damage location, and X-ray scanning, which can accurately reflect the degree of damage. Therefore, it can achieve the technical effect of quickly locating the damage location and accurately measuring the damage inside the material.

[0048] In one embodiment, such as Figure 3 As shown, another method for testing dry bushings is provided. This method includes the following steps:

[0049] Step 301: Perform ultrasonic scanning tests on multiple dry sleeve samples to be tested and determine the first scan result.

[0050] Step 301 can be seen as an example of step 101.

[0051] In some implementations, water is used as the coupling agent during ultrasonic C-scanning. Using water as the coupling agent ensures scanning quality while being economical, convenient, and readily available. Furthermore, it avoids the sample's performance being affected by the coupling agent.

[0052] Step 302: Based on the first scan result, determine the target sample and the damage area of ​​the target sample.

[0053] Step 302 can be seen as an example of step 102.

[0054] In some implementations, damaged samples (target samples) and undamaged samples (non-target samples) can be distinguished based on the first scan result. For damaged samples, all damaged areas can be identified, or the largest damaged area can be determined. Identifying the largest damaged area and performing X-ray scanning on its cross-section in subsequent steps can effectively reduce the workload and improve detection efficiency. This is because determining the degree of damage based on the X-ray scan results of the largest damaged area is indeed faster and more accurate than determining it based on the X-ray scan results of all damaged areas.

[0055] Step 303: Perform X-ray scanning test on the fracture site of the damaged area to obtain the second scan result.

[0056] Step 303 can be seen as an example of step 103.

[0057] Step 304: Perform graded load tests on the target sample, and conduct acoustic emission tests on the target sample in each graded load test stage to obtain the first test result.

[0058] In one embodiment, the load gradient of the graded load-holding test is obtained based on the maximum failure load, which is determined by performing a tensile test on any one of the non-target specimens among a plurality of dry casing specimens to be tested. That is, the maximum failure load is determined by stretching an undamaged specimen to its maximum extent (i.e., stretching it until the specimen completely breaks), and then the load gradient of the graded load-holding test is set according to this maximum failure load.

[0059] In some implementations, the load is graded as a percentage of the maximum breaking load. During implementation, the load is increased to the graded node at a uniform tensile speed of X1, held constant for a duration of T1, and then increased to the next graded node at the same tensile speed. This process is repeated until tensile fracture occurs. In one example, X1 is 0.05 kN / s and T1 is 1 minute. In another example, X1 is 0.1 kN / s and T1 is 3 minutes. However, it should be understood that these are merely examples of X1 and T1, and specific values ​​can be chosen according to actual needs; there are no limitations.

[0060] In one example, multiple percentages of the maximum breaking load could be: 10%, 30%, 40%, 50%, 60%, 70%, 80%, and the force at complete fracture (i.e., 100% of the maximum breaking load). In another example, multiple percentages of the maximum breaking load could be: 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, and 100%. However, it should be understood that these are merely examples of possible multiple percentages, and different load gradients can be selected according to actual needs; there are no limitations.

[0061] In one embodiment, a universal testing machine can be used to tensile a non-target specimen to obtain the maximum breaking load. The universal testing machine can be selected with a range as needed, preferably a device with a sensor range of 100kN or 50kN, to ensure that the clamps can hold the specimen and that the applied load force does not exceed the range.

[0062] Optionally, when measuring the maximum breaking load using a universal testing machine, a suitable tensile rate can be selected, such as 10 mm / min. That is, the tensile rate can be set as low as possible at each stage of the graded load test to facilitate observation of tensile changes. When measuring the maximum breaking load, the tensile rate can be set slightly higher, but not too high, to avoid affecting the accuracy of the maximum breaking load measurement. Multiple tests can be conducted, and statistical analysis can be performed to determine the appropriate tensile rate.

[0063] Optionally, step 303 can be performed during step 304 to obtain the changes in the damage area at different load-bearing test stages.

[0064] Acoustic emission (AE) technology can detect dynamic real-time information on structural damage within materials, such as monitoring crack initiation and propagation. While there are studies using AE equipment to study the internal damage evolution of carbon fiber reinforced composites and glass fiber reinforced composites, its application to materials primarily composed of aluminum foil, epoxy resin, and crepe paper is limited. In this application, AE technology is used to detect the changing trends of the damaged areas in the sample.

[0065] In one embodiment, the first test result is represented by a curve showing the trend of cumulative energy over time, the slope of which is positively correlated with the damage level.

[0066] Based on the time variable, stress-strain curves, load and energy, and cumulative energy data can be correlated and analyzed. According to the load gradient, cumulative energy and time are linearly fitted within each time period of load increase (i.e., each tensile stage of the graded load holding test) to obtain the fitted curve.

[0067] In one embodiment, the curve showing the trend of cumulative energy over time is obtained by linearly fitting the cumulative energy and time using a piecewise low-order interpolation polynomial. This fitting method is a piecewise low-order interpolation linear fitting method, which can avoid the Runge phenomenon caused by high-order interpolation fitting, and has good applicability to data processing of graded load-holding tests, ensuring accuracy while the calculation process is relatively simple.

[0068] In some implementations, the time interval can be divided into N segments for piecewise low-order interpolation fitting at each tensile stage. For example, this could include performing low-order linear interpolation fitting on the cumulative energy and time in N segments at the force change stages of 10%–30% maximum failure load, 30%–40% maximum failure load, 40%–50% maximum failure load, 50%–60% maximum failure load, 60%–70% maximum failure load, 70%–80% maximum failure load, and 80%–100% maximum failure load. N is an integer greater than or equal to 2. It should be understood that the above percentage range of maximum failure load (corresponding to each stage of the graded load-holding test) is only an example; in actual operation, the values ​​can be selected as needed, and there is no limitation. For example, it can also include the force change stages at 10%–20% maximum failure load, 20%–30% maximum failure load, 30%–40% maximum failure load, 40%–50% maximum failure load, 50%–60% maximum failure load, 60%–70% maximum failure load, 70%–80% maximum failure load, and 80%–100% maximum failure load, and perform low-order linear interpolation fitting on the accumulated energy and time in 5 segments respectively.

[0069] The optimal value is N=5, which ensures the accuracy of the fitted curve while avoiding the problem of excessive computation caused by an excessively large N.

[0070] In some implementations, based on the load gradient, within each period of load increase, the cumulative energy and time are linearly fitted in five segments using piecewise low-order interpolation polynomials. The formula for the piecewise low-order interpolation polynomials is as follows:

[0071]

[0072] In equation (1), E is the cumulative energy of acoustic emission, in mV·us; t is time, in s, and the cumulative energy value at a specific moment can be measured by acoustic emission experiment.

[0073] The formula for fitting the cumulative energy and time is as follows:

[0074] E n (t)=k n t+E n-1 ,T n ≤t≤T n+1 (2)

[0075] In equation (2), k n E is a constant coefficient obtained by fitting the cumulative energy and time. n-1 T represents the initial energy at the start of the nth graded stretching stage, which is the energy at the end of the (n-1)th graded stretching stage; n T represents the moment when the nth stage of graded stretching begins; n+1 This is the moment when the nth stage of graded stretching ends.

[0076] In one embodiment, the curve showing the trend of accumulated energy changing over time is as follows: Figure 4 As shown. From Figure 4 It can be seen that the trend of energy change over time can be approximated as an exponential growth trend.

[0077] Step 305: Determine the damage level of the target specimen based on the second scan results and the first test results.

[0078] The damage level can be determined based on the crack pattern presented in the second scan results and the slope of the curve in the first test results.

[0079] In one embodiment, the second scan result is a two-dimensional grayscale image; when determining the damage level of the target sample based on the second scan result and the first test result, the following steps may be included: performing three-dimensional reconstruction processing on the second scan result to obtain a three-dimensional image of the second scan result; determining the damage level based on the crack condition presented in the three-dimensional image of the second scan result and the first test result. In one embodiment, the crack condition is positively correlated with the damage level.

[0080] In one embodiment, when performing three-dimensional reconstruction processing on the second scan result to obtain a three-dimensional image of the second scan result, the following operations can be performed: preprocessing the two-dimensional grayscale image to obtain a processed two-dimensional grayscale image; performing three-dimensional reconstruction processing on the processed two-dimensional grayscale image to obtain a three-dimensional image.

[0081] In some implementations, the preprocessing described above may include at least one of convolutional filtering, high-hat transform, low-hat transform, or binarization. The main purpose of this preprocessing is to enhance the cracked areas in the two-dimensional grayscale image.

[0082] For example, a two-dimensional grayscale image obtained from an X-ray tomography scan can first undergo convolution filtering to remove noise. Since different materials have different X-ray mass attenuation coefficients, they reflect different grayscale values. Then, high-hat and low-hat transformations are applied to the two-dimensional grayscale image based on these different grayscale values ​​to highlight and enhance the crack image. The processed image is then binarized. Finally, the processed two-dimensional image is reconstructed in three dimensions to obtain a three-dimensional image of the crack.

[0083] Table 2 shows the correspondence between damage conditions, the slope of the energy accumulation curve, crack conditions, and the load gradient during the graded load holding test stage.

[0084] Table 2

[0085]

[0086] The epoxy resin-based dry bushing capacitor core composite material (i.e., the dry bushing of the present application embodiment) exhibits the Kessel effect, and acoustic emission events rarely occur during the load holding process. The rate of change of accumulated energy during the load holding process can be approximated as 0, and the analysis focuses on the densely occurring part of acoustic emission events.

[0087] Simultaneously, based on the internal morphology analysis obtained from X-ray tomography, during the 0-10% load stage, there were virtually no acoustic emission events, the accumulated energy approached zero, and no cracks were observed in the 3D images. During the 10%-30% load stage, acoustic emission events were rare, energy accumulation was minimal, and fine cracks and burrs were visible in the 3D images, mostly caused by original internal defects. As the load increased, the matrix of the composite material gradually showed a slight cracking trend. During the 30%-50% load stage, acoustic emission events increased, the energy accumulation rate accelerated, and obvious cracks appeared in the 3D images. Matrix cracks and interface debonding coupling gradually began to show a delamination trend. During the 50%-80% load stage, acoustic emission events occurred in large numbers, energy accumulated rapidly, and the crack width in the 3D images expanded with obvious delamination, indicating significant material delamination and its rapid growth. During the 80%-100% load period, acoustic emission events increased dramatically, the energy accumulation rate accelerated sharply, fiber breakage increased rapidly, and the macroscopic deformation of the sample was significant, even leading to fracture, ultimately resulting in complete sample failure.

[0088] Therefore, the damage to the core material of dry bushing capacitors can be classified into five levels.

[0089] No damage: During the 0-10% load stage, there are basically no acoustic emission events, the accumulated energy approaches 0, the three-dimensional image shows no cracks, and it is in a no-damage state.

[0090] Minor damage: During the 10% to 30% load stage, the slope of the cumulative energy curve k1 is small, and there are fine cracks and burrs in the three-dimensional image. These are mostly caused by original defects inside the material. The composite material is relatively stable and has little impact on the load-bearing capacity of the material. It can be put into production and use.

[0091] Damage: During the 30%–50% load stage, the slopes k2 and k3 of the cumulative energy curve are relatively small, and there are obvious cracks in the three-dimensional image. The matrix cracks and interface debonding coupling gradually begin to show a delamination trend, and the damage to the composite material begins to intensify, affecting the load-bearing capacity of the material. It is necessary to check the functional status of the equipment used for the material in a timely manner, and replace it in time if the status is abnormal.

[0092] High damage: During the 50%–80% load stage, the slopes of the cumulative energy curves k4, k5, and k6 are large, and the crack width in the three-dimensional image is expanded and delamination is obvious, indicating that the composite material is significantly delaminated and internal damage will accumulate and intensify rapidly, which will seriously affect the load-bearing capacity of the material. It is not recommended to use it in production for a long time, and the equipment parts need to be replaced in time.

[0093] Severe damage: During the 80%–100% load stage, the slope of the cumulative energy curve k7 is extremely high, fiber breakage increases rapidly, the composite material is extremely unstable, damage accumulates and expands very quickly, and it cannot be put into production use.

[0094] The scheme in this application employs ultrasonic C-scan technology to quickly determine whether damage exists in the static state of the sample. X-ray tomography effectively obtains the internal damage morphology of the material, providing a more accurate basis for the study of damage development and evolution and damage classification. Acoustic emission-assisted tensile testing, sampling multiple acoustic emission signal parameters, effectively explores and analyzes the development and evolution of internal damage in the composite material. Analyzing the cumulative energy change rate during graded tensile loading improves the reliability and accuracy of the damage development and evolution analysis. A piecewise low-order interpolation linear fitting method is used to fit the cumulative energy versus time curve, which has good applicability to data processing in graded load-bearing tests, ensuring accuracy while maintaining a relatively simple calculation process.

[0095] It should be understood that although the steps in the flowcharts of the embodiments described above are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the embodiments described above may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages of other steps.

[0096] Based on the same inventive concept, this application also provides a dry casing detection device for implementing the dry casing detection method described above. The solution provided by this device is similar to the solution described in the above method. Therefore, the specific limitations of one or more dry casing detection device embodiments provided below can be found in the limitations of the dry casing detection method above, and will not be repeated here.

[0097] In one embodiment, such as Figure 5 As shown, a dry bushing testing device 1000 is provided, comprising: a first testing module 1001, a processing module 1002, and a second testing module 1003, wherein:

[0098] The first test module 1001 is used to perform ultrasonic scanning tests on multiple dry sleeve samples to be tested and determine the first scan result; the first scan result is used to indicate whether each of the multiple dry sleeve samples to be tested has damage.

[0099] The processing module 1002 is used to determine the target sample and the damaged area of ​​the target sample based on the first scan result; the target sample is a sample with damage among multiple dry sleeve samples to be tested.

[0100] The second test module 1003 is used to perform X-ray scanning tests on the fracture site of the damaged area to obtain a second scan result; the second scan result is used to indicate the damage status of the target dry casing.

[0101] In one embodiment, the device 1000 further includes a third testing module 1004, used to perform graded load tests on the target sample and to perform acoustic emission tests on the target sample in each graded load test stage to obtain a first test result. The processing module 1002 is further used to determine the damage level of the target sample based on the second scan result and the first test result.

[0102] In one embodiment, the first experimental results are represented by a curve showing the trend of cumulative energy over time; the slope of the curve is positively correlated with the damage level.

[0103] In one embodiment, the second scan result is a two-dimensional grayscale image; when the processing module 1002 determines the damage level of the target sample based on the second scan result and the first test result, it may perform the following steps: perform three-dimensional reconstruction processing on the second scan result to obtain a three-dimensional image of the second scan result; determine the damage level based on the crack situation presented in the three-dimensional image of the second scan result and the first test result; the crack situation is positively correlated with the damage level.

[0104] In one embodiment, the curve of the cumulative energy changing over time is obtained by linearly fitting the cumulative energy and time using a piecewise low-order interpolation polynomial.

[0105] In one embodiment, when the processing module 1002 performs three-dimensional reconstruction processing on the second scanning result to obtain a three-dimensional image of the second scanning result, it can perform the following operations: preprocess the two-dimensional grayscale image to obtain a processed two-dimensional grayscale image; perform three-dimensional reconstruction processing on the processed two-dimensional grayscale image to obtain a three-dimensional image.

[0106] In one embodiment, the load gradient of the graded load-holding test is obtained based on the maximum destructive load, which is obtained by performing a tensile test on any one of the non-target specimens among a plurality of dry casing specimens to be tested.

[0107] Each module in the aforementioned dry bushing detection device can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in or independent of the processor in a computer device, or stored in the computer device's memory as software, so that the processor can call and execute the corresponding operations of each module.

[0108] In one embodiment, a computer device is provided, which may be a server, and its internal structure diagram may be as follows: Figure 6As shown, this computer device includes a processor, memory, input / output (I / O) interfaces, and a communication interface. The processor, memory, and I / O interfaces are connected via a system bus, and the communication interface is also connected to the system bus via the I / O interfaces. The processor provides computational and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system, computer programs, and a database. The internal memory provides the environment for the operating system and computer programs in the non-volatile storage media to run. The database stores data such as first scan results and second scan results. The I / O interfaces are used for exchanging information between the processor and external devices. The communication interface is used for communication with external terminals via a network connection. When executed by the processor, the computer program implements a method for detecting dry bushings.

[0109] Those skilled in the art will understand that Figure 6 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the computer device to which the present application is applied. Specific computer devices may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0110] In one embodiment, a computer device is provided, including a memory and a processor. The memory stores a computer program, and the processor executes the computer program to perform the following steps: performing ultrasonic scanning tests on a plurality of dry sleeve samples to be tested to determine a first scan result; the first scan result is used to indicate whether each of the plurality of dry sleeve samples to be tested is damaged; based on the first scan result, determining a target sample and a damaged area of ​​the target sample; the target sample is the sample with damage among the plurality of dry sleeve samples to be tested; performing X-ray scanning tests on the tomographic area of ​​the damaged area to obtain a second scan result; the second scan result is used to indicate the damage status of the target sample.

[0111] In one embodiment, when the processor executes the computer program, it further performs the following steps: performing graded load tests on the target specimen, and performing acoustic emission tests on the target specimen in each graded load test stage to obtain a first test result; and determining the damage level of the target specimen based on the second scan result and the first test result.

[0112] In one embodiment, when the processor executes the computer program, it further performs the following steps: the second scan result is a two-dimensional grayscale image; the second scan result is subjected to three-dimensional reconstruction processing to obtain a three-dimensional image of the second scan result; the damage level is determined based on the crack condition presented in the three-dimensional image of the second scan result and the first test result; the crack condition is positively correlated with the damage level.

[0113] In one embodiment, when the processor executes the computer program, it further performs the following steps: preprocessing the two-dimensional grayscale image to obtain a processed two-dimensional grayscale image; and performing three-dimensional reconstruction processing on the processed two-dimensional grayscale image to obtain a three-dimensional image.

[0114] In one embodiment, a computer-readable storage medium is provided having a computer program stored thereon. When executed by a processor, the computer program performs the following steps: performing ultrasonic scanning tests on a plurality of dry sleeve samples to be tested to determine a first scan result; the first scan result is used to indicate whether each of the plurality of dry sleeve samples to be tested is damaged; based on the first scan result, determining a target sample and a damaged area of ​​the target sample; the target sample is the sample with damage among the plurality of dry sleeve samples to be tested; performing X-ray scanning tests on the tomographic area of ​​the damaged area to obtain a second scan result; the second scan result is used to indicate the damage status of the target sample.

[0115] In one embodiment, when the computer program is executed by the processor, it further performs the following steps: performing graded load tests on the target specimen, and performing acoustic emission tests on the target specimen at each graded load test stage to obtain a first test result; and determining the damage level of the target specimen based on the second scan result and the first test result.

[0116] In one embodiment, when the computer program is executed by the processor, it further performs the following steps: the second scan result is a two-dimensional grayscale image; the second scan result is subjected to three-dimensional reconstruction processing to obtain a three-dimensional image of the second scan result; the damage level is determined based on the crack condition presented in the three-dimensional image of the second scan result and the first test result; the crack condition is positively correlated with the damage level.

[0117] In one embodiment, when the computer program is executed by the processor, it further performs the following steps: preprocessing the two-dimensional grayscale image to obtain a processed two-dimensional grayscale image; and performing three-dimensional reconstruction processing on the processed two-dimensional grayscale image to obtain a three-dimensional image.

[0118] In one embodiment, a computer program product is provided, including a computer program that, when executed by a processor, performs the following steps: performing ultrasonic scanning tests on a plurality of dry sleeve samples to be tested, and determining a first scan result; the first scan result is used to indicate whether each of the plurality of dry sleeve samples to be tested is damaged; based on the first scan result, determining a target sample and a damaged area of ​​the target sample; the target sample is a sample among the plurality of dry sleeve samples to be tested that is damaged; performing X-ray scanning tests on the tomographic region of the damaged area to obtain a second scan result; the second scan result is used to indicate the damage status of the target sample.

[0119] In one embodiment, when the computer program is executed by the processor, it further performs the following steps: performing graded load tests on the target specimen, and performing acoustic emission tests on the target specimen at each graded load test stage to obtain a first test result; and determining the damage level of the target specimen based on the second scan result and the first test result.

[0120] In one embodiment, when the computer program is executed by the processor, it further performs the following steps: the second scan result is a two-dimensional grayscale image; the second scan result is subjected to three-dimensional reconstruction processing to obtain a three-dimensional image of the second scan result; the damage level is determined based on the crack condition presented in the three-dimensional image of the second scan result and the first test result; the crack condition is positively correlated with the damage level.

[0121] In one embodiment, when the computer program is executed by the processor, it further performs the following steps: preprocessing the two-dimensional grayscale image to obtain a processed two-dimensional grayscale image; and performing three-dimensional reconstruction processing on the processed two-dimensional grayscale image to obtain a three-dimensional image.

[0122] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM). The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, etc., and are not limited to these.

[0123] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0124] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A method for detecting dry bushings, characterized in that, The method includes: Multiple dry sleeve samples to be tested are subjected to ultrasonic scanning tests to determine the first scanning result; the first scanning result is used to indicate whether each of the multiple dry sleeve samples to be tested is damaged. Based on the first scan result, the target sample and the damaged area of ​​the target sample are determined; the target sample is the sample with damage among the plurality of dry sleeve samples to be tested; The target specimen is subjected to a graded load-holding test, wherein the load gradient of the graded load-holding test is obtained based on the maximum destructive load, which is obtained by performing a tensile test on any one of the non-target specimens among the plurality of dry sleeve specimens to be tested; acoustic emission tests are performed on the target specimen in each graded load-holding test stage, and in each graded load-holding test stage, the time interval is divided and piecewise low-order interpolation fitting is performed to obtain a first test result, which is represented by a curve showing the trend of cumulative energy change over time, and the slope of the curve is positively correlated with the damage level; and... In each stage of the graded load test, X-ray scanning tests are performed at the fault in the damaged area to obtain a second scanning result. The second scanning result is used to represent the damage condition of the target sample. The second scanning result is a two-dimensional grayscale image with cracks. The two-dimensional grayscale image is subjected to convolution filtering to obtain a noise-removed two-dimensional grayscale image. The noise-removed two-dimensional grayscale image is subjected to high-hat transform and low-hat transform, and then binarized to obtain a processed two-dimensional grayscale image. The processed two-dimensional grayscale image is subjected to three-dimensional reconstruction to obtain a three-dimensional image of the second scanning result. Based on the crack condition presented in the three-dimensional image of the second scan result and the first test result, the damage level of the target sample is determined, and the crack condition is positively correlated with the damage level.

2. The method according to claim 1, characterized in that, The ultrasonic scanning test can be performed using point scanning, line scanning, or area scanning.

3. The method according to claim 1, characterized in that, The first scan result is a grayscale image.

4. The method according to claim 1, characterized in that, Water is used as a coupling agent during ultrasonic scanning tests.

5. The method according to claim 1, characterized in that, The maximum breaking load is obtained by tensile testing the non-target specimen using a universal testing machine.

6. A detection device for dry bushings, characterized in that, The device includes: The first testing module is used to perform ultrasonic scanning tests on multiple dry sleeve samples to be tested and determine the first scanning result; the first scanning result is used to indicate whether each of the multiple dry sleeve samples to be tested is damaged. The processing module is used to determine the target sample and the damaged area of ​​the target sample based on the first scanning result; the target sample is the sample with damage among the plurality of dry sleeve samples to be tested. The second testing module is used to perform graded load-bearing tests on the target specimen. The load gradient of the graded load-bearing test is obtained based on the maximum destructive load, which is obtained by performing a tensile test on any non-target specimen among the plurality of dry casing specimens to be tested. Acoustic emission tests are performed on the target specimen in each graded load-bearing test stage. In each graded load-bearing test stage, the time interval is divided, and piecewise low-order interpolation fitting is performed to obtain a first test result. The first test result is represented by a curve showing the cumulative energy change over time, and the slope of the curve is positively correlated with the damage level. Furthermore, in each graded load-bearing test stage, the fault at the damaged area is subjected to... An X-ray scan test is performed to obtain a second scan result, which represents the damage condition of the target sample. The second scan result is a two-dimensional grayscale image with cracks. The two-dimensional grayscale image is subjected to convolution filtering to obtain a noise-removed two-dimensional grayscale image. The noise-removed two-dimensional grayscale image is then subjected to high-hat and low-hat transformations and binarized to obtain a processed two-dimensional grayscale image. The processed two-dimensional grayscale image is then subjected to three-dimensional reconstruction to obtain a three-dimensional image of the second scan result. Based on the crack condition presented in the three-dimensional image of the second scan result and the first test result, the damage level of the target sample is determined, and the crack condition is positively correlated with the damage level.

7. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the method according to any one of claims 1 to 5.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 5.

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