A nondestructive testing method for building a digital twin model based on multi-source data

Abstract

The present application relates to a kind of based on multi-source data construction digital twin model nondestructive testing method, including the following process steps: 1), in the surface of composite material board with copper wire is marked in warp and weft yarn two directions respectively, establish coordinate;2), from the marked composite material board, by CT scanning detection device carries out CT scanning, obtains high-resolution image;3), image analysis: find out the repeated fiber structure in warp and weft yarn direction, i.e. cell;4), the sample marked carries out phased array ultrasonic scanning, the data information obtained is 3D processing, compared with CT scanning model, judges the type and position of damage detection.The present application combines CT scanning detection technology and phased array ultrasonic detection image 3D method, can efficiently and accurately realize the type judgment and positioning of internal damage of composite material component.

Description

Technical field

[0001] The present invention relates to a method for detecting internal damage of a material, and in particular to a nondestructive testing method for constructing a digital twin model based on multi-source data, belonging to the technical field of nondestructive testing. [Background Technology]

[0002] Ultrasonic nondestructive testing (NDT) is widely used in the nondestructive testing of composite materials to better detect internal damage types and precisely locate damage. However, NDT still has certain limitations, including low accuracy in locating damage in large components and the influence of laminar anisotropy.

[0003] Therefore, in order to solve the above problems, it is necessary to provide an innovative non-destructive testing method based on multi-source data to build a digital twin model, which can accurately locate the internal damage of the component and determine the type of damage, timely discover and take corresponding measures to repair the damage, and avoid catastrophic consequences. [Summary of the invention]

[0004] The purpose of the present invention is to provide a nondestructive testing method for constructing a digital twin model based on multi-source data. It combines CT scanning detection technology and phased array ultrasonic detection image 3Dization method to efficiently and accurately determine and locate the internal damage type of composite components.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is: a non-destructive testing method for constructing a digital twin model based on multi-source data, which includes the following process steps:

[0006] 1) Use copper wire to mark the surface of the composite material in both the warp and weft directions to establish coordinates;

[0007] 2) Take a unit from the marked composite material plate and perform CT scanning using a CT scanning detection device to obtain a high-resolution image;

[0008] 3) Image analysis: Find the fiber structure that repeats in the warp and weft directions, which is the cell;

[0009] 4) The marked specimens are scanned with phased array ultrasound, and the obtained data information is processed into 3D and compared with the CT scan model to determine the type and location of the damage.

[0010] The nondestructive testing method of the present invention for constructing a digital twin model based on multi-source data is further as follows: in the step 1), the copper wire is marked in both the warp and weft directions with the same step length.

[0011] The nondestructive testing method of the present invention for constructing a digital twin model based on multi-source data is further as follows: in the step 2), the CT scanning detection device includes a radiation source, an operating table and a flat-panel detector arranged in sequence; the removed unit is fixed tightly on the operating table, and the X-ray scanning of the radiation source is performed, and the flat-panel detector obtains detailed information inside the sample, and finally uses computer information processing and image reconstruction to display it in the form of an image.

[0012] The nondestructive testing method of the present invention for constructing a digital twin model based on multi-source data is further as follows: the operating table is a rotating operating table, which can drive the marked sample to rotate to achieve CT scanning at various angles.

[0013] The nondestructive testing method of the present invention for constructing a digital twin model based on multi-source data is further as follows: Step 3) is specifically: first observe the internal fiber structure distribution of the composite material plate unit in the warp direction; then observe the internal fiber structure distribution of the composite material plate unit in the weft direction, and find the repeated fiber structures in the warp direction and the weft direction respectively as the cells of the internal structure of the entire sample.

[0014] The nondestructive testing method of the present invention for constructing a digital twin model based on multi-source data is further as follows: Step 4) specifically comprises: placing a phased array probe close to the surface of the marked sample, connecting the two using a fluid coupling agent, and scanning along a single direction until the entire surface of the scanning area is completely covered; the phased array probe transmits and receives ultrasonic signals, and the encoder converts the ultrasonic signals into electrical signals and transmits them to the flaw detector, and finally the collected data information is processed into 3D.

[0015] The nondestructive testing method of the present invention for constructing a digital twin model based on multi-source data further comprises: the 3D processing of the ultrasonic data is specifically as follows:

[0016] 4-1), calculate the actual physical position x, y, z of the sampling point in the ultrasound data, and the calculation formula is as follows: x = Δl·s; z = 7.2 (m-1) + 0.3 c; where Δl represents the step size of the scanning path, s represents the position index, u represents the speed of sound, n represents the number of sampling points, f represents the sampling frequency, m represents the position index of a point along the z direction, and c represents the number of channels;

[0017] 4-2), the volume is represented by a three-dimensional scalar matrix, which is equivalent to a three-dimensional Cartesian grid indexed by i, j, and k; the index is calculated as follows:

[0018]

[0019]

[0020]

[0021] Where T i 、T j 、T k Represents the resolution of the grid in the x, y, and z directions respectively;

[0022] The above two steps map each sampling point in the original ultrasonic data into a three-dimensional matrix, and use the 6dB drop method to quantify the damage size, thereby achieving direct damage identification and location.

[0023] The nondestructive testing method of the present invention for constructing a digital twin model based on multi-source data can also be: in the step 4), the specific method of comparative verification is: coordinate alignment of the 3D-processed image of the ultrasonic scan and the image of the CT scan. In the image, if the same position in the sample is only considered as damaged in the 3D-processed image or only as damaged in the CT scan image, or is considered as damaged in both images, it can be determined that the position of the area of ​​the sample is damaged.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. The nondestructive testing method of the present invention for constructing a digital twin model based on multi-source data utilizes CT scanning detection technology, which has enhanced defect detection and positioning capabilities, and a method for determining the type and location of damage by using a phased array ultrasonic detection image 3D method, thereby enabling efficient and accurate judgment and positioning of internal damage types in composite components.

[0026] 2. The nondestructive testing method of the present invention, which builds a digital twin model based on multi-source data, can reveal the precise geometric structure of woven composite materials, including the fabric structure and initial manufacturing defects. Therefore, it is easy to predict the type of any defect inside a large composite sample and accurately determine the location of the defect, so as to promptly discover and take corresponding measures to repair the damage and avoid catastrophic consequences.

[0027] 3. The nondestructive testing method of the present invention for constructing a digital twin model based on multi-source data can conveniently specify the material direction for anisotropic materials so as to be used for studying the mechanical properties of composite materials.

Brief Description of the Drawings

[0028] Figure 1 It is an overall flow chart of the nondestructive testing method of the present invention for building a digital twin model based on multi-source data.

[0029] Figure 2 Schematic diagram of copper wire marking sample in step 1) of the present invention.

[0030] Figure 3 Schematic diagram of the CT scanning detection device in step 2) of the present invention.

[0031] Figure 4 It is a schematic diagram of the internal fiber structure in the warp and weft directions in step 3) of the present invention.

[0032] Figure 5 Schematic diagram of the phased array ultrasonic detection device in step 4) of the present invention. [Specific implementation method]

[0033] Please refer to the instruction manual Figure 1 To the attached Figure 5 As shown, the present invention is a non-destructive testing method for constructing a digital twin model based on multi-source data, which includes the following process steps:

[0034] 1) Copper wires 2 are used to mark the surface of the composite material board 1 in both the warp and weft directions to establish coordinates. In this embodiment, the copper wires 2 are used to mark the surface of the composite material board 1 in both the warp and weft directions with the same step length.

[0035] 2) Take a unit 6 from the marked composite material plate 1 and perform CT scanning using a CT scanning detection device to obtain a high-resolution image.

[0036] Specifically, the CT scanning device consists of a sequentially arranged radiation source 3, an operating table 4, and a flat-panel detector 5. The operating table 4 is a rotary table that drives the marked specimen 6 to rotate, enabling CT scanning at various angles. The flat-panel detector 5 is responsible for collecting scan data. The CT scanning device can be equipped with shielding to prevent radiation leakage and ensure the safety of the scanning process.

[0037] The removed unit 6 is fixed tightly on the operating table 4. After X-ray scanning by the radiation source 3, the flat panel detector 5 obtains detailed information inside the sample, which is finally displayed in the form of an image through computer information processing and image reconstruction.

[0038] 3) Image analysis: Find the repeated fiber structures in the warp and weft directions as cells. That is, first observe the internal fiber structure distribution in the warp direction of the composite material plate unit 6; then observe the internal fiber structure distribution in the weft direction of the composite material plate unit, and find the repeated fiber structures in the warp and weft directions respectively as the cells of the entire internal structure of the sample. The entire internal structure of the sample is composed of these cells expanded in two directions.

[0039] 4) The marked specimens are scanned with phased array ultrasound, and the obtained data information is processed into 3D and compared with the CT scan model to determine the type and location of the damage.

[0040] The method of the phased array ultrasonic scanning is as follows: the phased array probe 9 is tightly attached to the surface of the marked sample 6, and the fluid coupling agent is used to connect between the two contacts, and the scanning path is in a single direction to completely cover the surface of the entire scanning area. The fluid coupling agent is an ultrasonic detection permanent coupling agent. The phased array probe 9 transmits and receives ultrasonic signals, the encoder 10 converts the ultrasonic signals into electrical signals and transmits them to the flaw detector 11, and finally the collected data information is processed into 3D.

[0041] The specific process of the ultrasonic data 3D processing is as follows:

[0042] 4-1), the actual physical positions x, y, z of the sampling points in the ultrasonic data are calculated, and the calculation formula is as follows: x = Δl·s; z = 7.2·(m-1) + 0.3·c; wherein Δl represents the step length of the scanning path, s represents the position index, u represents the sound velocity, n represents the sampling point number, f represents the sampling frequency, m represents the position index of a point along the z direction, and c represents the channel number;

[0043] 4-2), a three-dimensional scalar matrix is used to represent the volume, and the matrix is equivalent to a three-dimensional Cartesian grid indexed by i, j, and k; the index index calculation formula is as follows:

[0044]

[0045]

[0046]

[0047] T i , T j , and T k respectively represent the resolution of the grid in the x, y, and z directions.

[0048] The above two steps map each sampling point in the original ultrasonic data to a three-dimensional matrix, and the damage size is quantified by using the 6db drop method, so as to realize direct damage identification and positioning.

[0049] The specific method of the comparison verification is as follows: the images of the ultrasonic scanning 3D processing and the CT scanning are aligned in coordinates, and in the images, for the same position in the sample, if it is considered as damage only in the 3D processing image or only in the CT scanning image or is considered as damage in both images, it can be determined that the damage of the sample in the region position.

[0050] In summary, the nondestructive testing method of the present invention for constructing a digital twin model based on multi-source data utilizes CT scanning detection technology to enhance defect detection and positioning capabilities; and utilizes a phased array ultrasonic detection image 3Dization method to determine the damage type and location, thereby enabling efficient and accurate judgment and positioning of the internal damage type of composite material components, and timely discovery and adoption of corresponding measures to repair the damage, thereby avoiding catastrophic consequences.

[0051] The above specific implementation methods are only preferred embodiments of this creation and are not intended to limit this creation. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this creation should be included in the scope of protection of this creation.

Claims

1. A nondestructive testing method for constructing a digital twin model based on multi-source data, characterized by: The process steps include: 1) Use copper wire to mark the warp and weft yarns on the surface of the composite material board to establish coordinates; the copper wire is marked in the warp and weft yarns with the same step length; 2) Remove a unit from the marked composite material plate and perform a CT scan using a CT scanning device to obtain a high-resolution image; the CT scanning device includes a radioactive source, an operating table, and a flat-panel detector arranged in sequence; the removed unit is fixed tightly to the operating table, and the radioactive source scans the X-rays, and the flat-panel detector obtains detailed information about the interior of the sample. Finally, computer information processing and image reconstruction are used to display the information in the form of an image; the operating table is a rotating operating table that can drive the marked sample to rotate to achieve CT scanning at various angles; 3) Image analysis: Find the repeated fiber structures in the warp and weft directions as cells; that is, first observe the distribution of the fiber structure in the warp direction of the composite material plate unit; then observe the distribution of the fiber structure in the weft direction of the composite material plate unit, and find the repeated fiber structures in the warp and weft directions as the cells of the entire sample's internal structure. The entire sample's internal structure is composed of these cells expanded in two directions; 4) Perform phased array ultrasonic scanning on the marked specimens, convert the acquired data into 3D data, and compare it with the CT scan model to determine the type and location of the damage. Specifically, the phased array probe is placed against the surface of the marked sample, with a fluid coupling agent used to connect the two. The scanning path is along a single direction until the entire surface of the scanning area is completely covered. The phased array probe transmits and receives ultrasonic signals, and the encoder converts the ultrasonic signals into electrical signals and transmits them to the flaw detector. Finally, the collected data information is processed into 3D. The 3D processing of ultrasound data is specifically as follows: 4-1), calculate the actual physical position x, y, z of the sampling point in the ultrasonic data, and the calculation formula is as follows: ; ; ;in represents the step size of the scanning path, s represents the position index, u represents the speed of sound, n represents the number of sampling points, f represents the sampling frequency, m represents the position index of a point along the z direction, and c represents the number of channels; 4-2), the volume is represented by a three-dimensional scalar matrix, which is equivalent to a three-dimensional Cartesian grid indexed by i, j, and k; the index calculation formula is as follows: ； in 、 、 Represents the resolution of the grid in the x, y, and z directions respectively; The above two steps map each sampling point in the original ultrasound data into a three-dimensional matrix and use the 6dB drop method to quantify the damage size, thereby achieving direct damage identification and location; The specific method of the comparative verification is: aligning the coordinates of the 3D-processed ultrasound scan image and the CT scan image. In the image, if the same position in the sample is only considered as damaged in the 3D-processed image, or only as damaged in the CT scan image, or is considered as damaged in both images, it can be determined that the position of the area of ​​the sample is damaged.

Images