Method for monitoring global strain field on line through high-speed rotation of turbine disc

Abstract

The invention provides a method for monitoring a global strain field on line through high-speed rotation of a turbine disc. The method comprises the steps that a reference image and a target image of the turbine disc are acquired; speckles are sprayed on the turbine disc in advance, the reference image is an image collected before the turbine disc executes a rotation test, and the target image is an image collected when the turbine disc executes the rotation test; determining a surface displacement field of the turbine disc according to the speckle pixels in the reference image and the speckle pixels in the target image; and obtaining a global strain field of the turbine disc according to the surface displacement field of the turbine disc. By applying the method provided by the embodiment of the invention, the precise and comprehensive global strain field of the turbine disc can be obtained.

Description

Technical Field

[0001] The present application relates to the field of information technology, and in particular to a method for online monitoring of the global strain field of a turbine disk during high-speed rotation. Background Art

[0002] As the heart of an aircraft, the performance and reliability of an aircraft engine are directly related to the safety and efficiency of the aircraft. Among them, the turbine disk, as a key component in an aircraft engine, is subjected to huge centrifugal force and tangential stress during high-speed rotation. These forces act on different parts of the turbine disk, resulting in a complex strain field distribution. According to the theory of elastic-plastic mechanics, the strain of the turbine disk during rotation is not only related to the magnitude of the stress it is subjected to, but also closely related to factors such as its position, material properties, and rotation speed. Therefore, accurately understanding and mastering the actual strain field of each part of the turbine disk during high-speed rotation is of vital importance for evaluating its structural strength, predicting fatigue life, optimizing design solutions, and ensuring safe service.

[0003] At present, the main method for testing the strain field of turbine disks during high-speed rotation is the strain gauge method, which monitors the strain condition of a local single point in a certain direction by sticking a strain gauge on the surface of the turbine disk. However, since the strain gauge can only cover a limited area and can only measure strain in a single direction, it is impossible to test the strain field of the entire turbine disk. In addition, the installation process of the strain gauge is complicated, and the measurement circuit is easily affected by electromagnetic interference and temperature effects, resulting in a decrease in measurement accuracy. Summary of the invention

[0004] The technical problem to be solved by this application is to provide a method for online monitoring of the global strain field of a turbine disk during high-speed rotation, which can obtain an accurate and comprehensive global strain field of the turbine disk. The specific solution is as follows:

[0005] A method for online monitoring of global strain field of a turbine disk rotating at high speed, comprising:

[0006] Acquire a reference image and a target image of a turbine disk; the turbine disk is pre-sprayed with speckles, the reference image is an image captured before the turbine disk performs a rotation test, and the target image is an image captured when the turbine disk performs a rotation test;

[0007] determining a surface displacement field of the turbine disk according to speckle pixels in the reference image and speckle pixels in the target image;

[0008] According to the surface displacement field of the turbine disk, the global strain field of the turbine disk is obtained.

[0009] The above method, optionally, obtains a target image of a turbine disk, including:

[0010] During the process of performing the rotation test on the turbine disk, detecting the test state of the turbine disk;

[0011] When it is detected that the test state of the turbine disk meets the preset acquisition condition, an image of the turbine disk is acquired to obtain a target image of the turbine disk.

[0012] In the above method, optionally, the process of detecting that the test state of the turbine disk meets the preset acquisition condition includes:

[0013] When it is detected that the test time of the turbine disk reaches the preset target time, it is determined that the test state of the turbine disk meets the preset collection condition.

[0014] In the above method, optionally, the process of detecting that the test state of the turbine disk meets the preset acquisition condition includes:

[0015] When it is detected that the test rotation speed of the turbine disk reaches a preset target test rotation speed, it is determined that the test state of the turbine disk meets a preset acquisition condition.

[0016] In the above method, optionally, determining the surface displacement field of the turbine disk according to the speckle pixels in the reference image and the speckle pixels in the target image comprises:

[0017] Determining relevant pixel information between the reference image and the target image; the relevant pixel information includes a first speckle pixel in the reference image and a second speckle pixel in the target image corresponding to the first speckle pixel;

[0018] Determining a displacement vector of a surface point of the turbine disk according to relevant pixel information between the reference image and the target image;

[0019] A surface displacement field of the turbine disk is determined based on displacement vectors of surface points of the turbine disk.

[0020] In the above method, optionally, obtaining the global strain field of the turbine disk according to the surface displacement field of the turbine disk comprises:

[0021] Obtaining a displacement gradient of the turbine disk according to a surface displacement field of the turbine disk;

[0022] The global strain field of the turbine disk is determined according to the displacement gradient of the turbine disk.

[0023] In the above method, optionally, obtaining the displacement gradient of the turbine disk according to the surface displacement field of the turbine disk comprises:

[0024] constructing a displacement gradient matrix according to the turbine disk surface displacement field;

[0025] The displacement gradient matrix is ​​subjected to differential processing to obtain the displacement gradient of the turbine disk.

[0026] In the above method, optionally, determining the global strain field of the turbine disk according to the displacement gradient of the turbine disk comprises:

[0027] According to the displacement gradient of the turbine disk, a circumferential strain test result and a radial strain test result of the turbine disk are obtained;

[0028] The circumferential strain test results and the radial strain test results of the turbine disk are combined to form the global strain field of the turbine disk.

[0029] The above method, optionally, after obtaining the global strain field of the turbine disk, further comprises:

[0030] Obtaining elastic-plastic theoretical calculation results of the turbine disk;

[0031] Comparing the global strain field of the turbine disk with the calculation result of the elastic-plastic theory to obtain a comparison result;

[0032] The comparison result is outputted.

[0033] The above method, optionally, after obtaining the global strain field of the turbine disk, further comprises:

[0034] The global strain field is displayed on a preset display interface.

[0035] Based on the above-mentioned implementation of this application, a method, device, storage medium and electronic device for online monitoring of the global strain field of a turbine disk rotating at high speed are provided, the method comprising: obtaining a reference image and a target image of the turbine disk; the turbine disk is pre-sprayed with speckles, the reference image is an image collected before the turbine disk performs a rotation test, and the target image is an image collected when the turbine disk performs a rotation test; the surface displacement field of the turbine disk is determined based on the speckle pixels in the reference image and the speckle pixels in the target image; the global strain field of the turbine disk is obtained based on the surface displacement field of the turbine disk. Applying the method provided in the embodiment of this application, an accurate and comprehensive global strain field of the turbine disk can be obtained. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0037] Figure 1 A method flow chart of a method for online monitoring of global strain field of a turbine disk with high-speed rotation provided in the present application;

[0038] Figure 2 A flowchart of a process for acquiring a target image of a turbine disk provided in the present application;

[0039] Figure 3 A flow chart of a process for determining a surface displacement field of a turbine disk provided in the present application;

[0040] Figure 4 A flowchart of a process for obtaining a global strain field of a turbine disk provided in the present application;

[0041] Figure 5 An example of a turbine disk surface with speckles drawn provided in this application;

[0042] Figure 6 A schematic diagram of the circumferential strain of a turbine disk provided in this application;

[0043] Figure 7 A schematic diagram of radial strain of a turbine disk provided in this application;

[0044] Figure 8 A schematic diagram of the structure of a device for online monitoring of the global strain field of a turbine disk with high-speed rotation provided in the present application;

[0045] Fig. 9 A schematic diagram of the structure of an electronic device provided in this application. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0047] In this application, the terms "comprises", "comprising" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0048] At present, the main method for testing the strain field of turbine disks during high-speed rotation is the strain gauge method, which monitors the strain condition of a local single point in a certain direction by sticking a strain gauge on the surface of the turbine disk. However, since the strain gauge can only cover a limited area and can only measure strain in a single direction, it is impossible to test the strain field of the entire turbine disk. In addition, the installation process of the strain gauge is complicated, and the measurement circuit is easily affected by electromagnetic interference and temperature effects, resulting in a decrease in measurement accuracy.

[0049] In some feasible ways, laser testing and numerical simulation methods are also used to obtain the strain information of the turbine disk. Among them, laser testing technology uses a laser beam to illuminate the surface of the turbine disk, and infers the strain of the surface by measuring the changes in reflected light or scattered light. Although this method has high measurement accuracy and flexibility, it also has the problem of only being able to monitor local areas, and the equipment is expensive and complicated to operate, which is not suitable for long-term continuous monitoring under extreme working conditions. The numerical simulation method is based on the theory of elastic-plastic mechanics and the finite element analysis method, and uses a computer to simulate the stress and strain distribution of the turbine disk during rotation. Although this method can predict the strain field conditions of different parts of the turbine disk, its results are often affected by factors such as model simplification, material parameter selection, and calculation accuracy, and there are certain differences from the actual situation.

[0050] Based on this, an embodiment of the present application provides a method for online monitoring of the global strain field of a turbine disk during high-speed rotation. The method can be applied to electronic equipment in a strain testing system. The strain testing system also includes a rotation tester and an image acquisition device. The rotation tester is used to control the rotation of the turbine disk, and the image acquisition device is used to acquire images of the turbine disk. The electronic device can be a personal computer, a server computer, a smart phone, a tablet or a smart wearable device, etc. The method flow chart of the method is as follows Figure 1 As shown, specifically including:

[0051] S101: Acquire a reference image and a target image of a turbine disk; the turbine disk is pre-sprayed with speckles, the reference image is an image captured before the turbine disk performs a rotation test, and the target image is an image captured when the turbine disk performs a rotation test.

[0052] In this embodiment, before the turbine disk sprayed with speckles is subjected to a rotation test, an image acquisition device is used to acquire an image of the turbine disk to obtain a reference image.

[0053] Optionally, in the process of rotating the turbine disk sprayed with speckles by using a rotary tester, an image of the turbine disk is captured by an imaging device to obtain a target image.

[0054] S102: Determine a surface displacement field of the turbine disk according to speckle pixels in the reference image and speckle pixels in the target image.

[0055] In this embodiment, the corresponding speckle pixels between the reference image and the target image can be determined first, and then the corresponding speckle pixels between the reference image and the target image can be measured to obtain the displacement information of the corresponding speckle pixels between the reference image and the target image, and the surface displacement field of the turbine disk can be determined according to the displacement information.

[0056] S103: Obtaining the global strain field of the turbine disk according to the surface displacement field of the turbine disk.

[0057] In this embodiment, the gradient of the turbine disk surface displacement can be calculated based on the surface displacement field of the turbine disk, and then the global strain field of the turbine disk can be obtained based on the gradient of the turbine disk surface displacement.

[0058] In the method provided in the embodiment of the present application, a reference image and a target image of a turbine disk can be first obtained; then, the surface displacement field of the turbine disk can be determined based on the speckle pixels in the reference image and the speckle pixels in the target image; finally, the global strain field of the turbine disk can be obtained based on the surface displacement field of the turbine disk. An accurate and comprehensive global strain field of the turbine disk can be obtained.

[0059] In an embodiment provided in the present application, based on the above implementation process, optionally, a process of acquiring a target image of a turbine disk is as follows: Figure 2 As shown, including:

[0060] S201: During the process of performing a rotation test on the turbine disk, detecting a test state of the turbine disk.

[0061] In this embodiment, the test state of the turbine disk may include the rotation speed, accumulated rotation time, rotation time at different rotation speeds, etc. of the turbine disk.

[0062] S202: When it is detected that the test state of the turbine disk meets a preset acquisition condition, an image of the turbine disk is acquired to obtain a target image of the turbine disk.

[0063] In this embodiment, the acquisition condition may be that the rotation speed of the turbine disk is at the target test speed or the test time of the turbine disk reaches the preset target time, etc.; the test time may be the accumulated rotation time, the rotation time at a specific rotation speed, etc.

[0064] In an embodiment provided in the present application, based on the above implementation process, optionally, the process of detecting that the test state of the turbine disk meets the preset collection condition includes:

[0065] When it is detected that the test time of the turbine disk reaches a preset target time, or the test speed of the turbine disk reaches a preset target test speed, it is determined that the test state of the turbine disk meets the preset collection condition.

[0066] In an embodiment provided in the present application, based on the above implementation process, optionally, the process of determining the surface displacement field of the turbine disk according to the speckle pixels in the reference image and the speckle pixels in the target image is as follows: Figure 3 As shown, including:

[0067] S301: Determine relevant pixel information between the reference image and the target image; the relevant pixel information includes a first speckle pixel in the reference image and a second speckle pixel in the target image corresponding to the first speckle pixel.

[0068] In this embodiment, the image correlation method DIC may be used to determine the relevant pixel information between the reference image and the target image.

[0069] Optionally, the number of the first speckle pixels in the relevant pixel information is multiple, and each first speckle pixel has a corresponding second speckle pixel.

[0070] S302: Determine a displacement vector of a surface point of the turbine disk according to relevant pixel information between the reference image and the target image.

[0071] In this embodiment, the displacement vector of the surface point may represent the distance from a first speckle pixel to its corresponding second speckle pixel.

[0072] Optionally, there are multiple surface points, and the surface points may be points where the first speckle pixels are located.

[0073] S303: Determine the surface displacement field of the turbine disk according to the displacement vectors of the surface points of the turbine disk.

[0074] In this embodiment, the displacement vectors of various surface points may be combined to construct a displacement field on the turbine disk surface.

[0075] In an embodiment provided in the present application, based on the above implementation process, optionally, the process of obtaining the global strain field of the turbine disk according to the surface displacement field of the turbine disk is as follows: Figure 4 As shown, including:

[0076] S401: Obtaining a displacement gradient of the turbine disk according to a surface displacement field of the turbine disk.

[0077] In some embodiments, a displacement gradient matrix may be constructed according to the surface displacement field, and then the displacement gradient matrix may be subjected to differential processing to obtain the displacement gradient of the turbine disk.

[0078] S402: Determine the global strain field of the turbine disk according to the displacement gradient of the turbine disk.

[0079] Optionally, the global strain field may include circumferential strain test results and radial strain test results.

[0080] In this embodiment, the global strain field of the turbine disk is determined according to the displacement gradient of the turbine disk, including: obtaining a circumferential strain test result and a radial strain test result of the turbine disk according to the displacement gradient of the turbine disk; and combining the circumferential strain test result and the radial strain test result of the turbine disk to form the global strain field of the turbine disk.

[0081] In an embodiment provided in the present application, based on the above solution, optionally, after obtaining the global strain field of the turbine disk, the method further includes:

[0082] Obtaining elastic-plastic theoretical calculation results of the turbine disk;

[0083] Comparing the global strain field of the turbine disk with the calculation result of the elastic-plastic theory to obtain a comparison result;

[0084] The comparison result is outputted.

[0085] In this embodiment, the comparison result can be output and displayed on a preset display interface, or sent to a preset terminal device, so that the user can determine the test effect of the global strain field of the turbine disk according to the comparison result.

[0086] Optionally, the calculation results of the elastic-plastic theory are calculated as follows:

[0087]

[0088] Where σr and σθ are the circumferential stress and radial stress at the disk radius r, respectively, r is the radius from the disk to the disk center, ρ is the disk material density, μ is the material Poisson's ratio, W is the turbine disk speed, a is the outer diameter of the turbine disk, and b is the inner diameter of the turbine disk.

[0089] Maximum radial force at Department:

[0090]

[0091] The maximum tangential stress is at the inner edge r = a:

[0092]

[0093] In this embodiment, after obtaining the global strain field of the turbine disk, the method further includes: displaying the global strain field on a preset display interface.

[0094] Optionally, the global strain field of the turbine disk can also be sent to a preset terminal.

[0095] In order to explain the principle of this solution more clearly, the following example illustrates the test process of the turbine disc:

[0096] The first step: Process the turbine disk blank into a disk flange shape, spray the speckle on the flat end of the turbine disk, and the surface of the turbine disk after spraying speckle is as follows: Figure 5 shown.

[0097] Step 2: Connect the adapter section to the turbine disk flange by bolts, and then connect the adapter section connected to the turbine disk to the rotation tester by bolts.

[0098] Step 3: Close the door of the rotating tester and adjust the light source in the bottom window of the rotating tester to ensure that the entire area of ​​the turbine disk is clearly visible.

[0099] Step 4: Use special tooling to fix the high-speed camera and place it at the observation window at the bottom of the rotating tester. Adjust the distance between the high-speed camera and the turbine disk to ensure that the shooting range can cover the entire area of ​​the turbine disk and is clear.

[0100] Step 5: Connect the computer to the high-speed camera and use a large-capacity storage card to store a large number of images.

[0101] Step 6: Turn on the high-speed rotation tester, set the target rotation speed, open the computer analysis software, and collect speckle images at different times or rotation speeds.

[0102] Step 7: Use analysis software to analyze the speckle images at different speeds to obtain the global strain field of the turbine disk during rotation. The circumferential strains at the center of the turbine disk P0, the spoke plate P1, and the rim P2 vary with rotation time as shown in the figure below: Figure 6 As shown in the figure, it can be seen that with the increase of the speed, the circumferential strain at different positions of the turbine disk increases, and the circumferential strain at the center of the turbine disk P0 is the largest after it reaches the target speed, the circumferential strain at the spoke plate P1 is relatively small, and the circumferential strain at the rim P2 is the smallest.

[0103] The radial strains at the turbine disk center P0, the spoke plate P1 and the rim P2 vary with rotation time as shown in Figure 7 As shown in the figure, it can be seen that with the increase of the speed, the radial strain at different positions of the turbine disk increases, and the radial strain at the turbine disk spoke P1 is the largest after it reaches the target speed, the radial strain at the disk center P1 is relatively small, and the radial strain at the rim P2 is the smallest.

[0104] and Figure 1 Corresponding to the method described above, the embodiment of the present application also provides a device for online monitoring of the global strain field of a turbine disk at high speed rotation, for Figure 1 The specific implementation of the method in the embodiment of the present invention is shown in the structural diagram of the device. Figure 8 As shown, including:

[0105] An acquisition unit 801 is used to acquire a reference image and a target image of a turbine disk; the turbine disk is pre-sprayed with speckles, the reference image is an image acquired before the turbine disk performs a rotation test, and the target image is an image acquired when the turbine disk performs a rotation test;

[0106] A determination unit 802, configured to determine a surface displacement field of the turbine disk according to the speckle pixels in the reference image and the speckle pixels in the target image;

[0107] The execution unit 803 is used to obtain the global strain field of the turbine disk according to the surface displacement field of the turbine disk.

[0108] In an embodiment provided in the present application, based on the above solution, optionally, the acquisition unit 801 includes:

[0109] a detection subunit, used for detecting a test state of the turbine disk during a rotation test of the turbine disk;

[0110] The acquisition subunit is used to acquire an image of the turbine disk when it is detected that the test state of the turbine disk meets a preset acquisition condition, so as to obtain a target image of the turbine disk.

[0111] In an embodiment provided in the present application, based on the above solution, optionally, the acquisition subunit includes:

[0112] The determination module is used to determine whether the test state of the turbine disk meets the preset collection condition when it is detected that the test time of the turbine disk reaches the preset target time or the test speed of the turbine disk reaches the preset target test speed.

[0113] In an embodiment provided in the present application, based on the above solution, optionally, the determining unit 802 includes:

[0114] a first determining subunit, configured to determine relevant pixel information between the reference image and the target image; the relevant pixel information comprising a first speckle pixel in the reference image and a second speckle pixel in the target image corresponding to the first speckle pixel;

[0115] A second determination subunit, configured to determine a displacement vector of a surface point of the turbine disk according to relevant pixel information between the reference image and the target image;

[0116] The third determining subunit is configured to determine the surface displacement field of the turbine disk according to the displacement vector of the surface point of the turbine disk.

[0117] In an embodiment provided in the present application, based on the above solution, optionally, the execution unit 803 includes:

[0118] an execution subunit, configured to obtain a displacement gradient of the turbine disk according to a surface displacement field of the turbine disk;

[0119] a fourth determining subunit, configured to determine a strain distribution of the turbine disk according to a displacement gradient of the turbine disk;

[0120] The fifth determining subunit is used to determine the strain distribution as the global strain field of the turbine disk.

[0121] The specific principles and execution processes of each unit and module in the device for online monitoring of the global strain field of high-speed rotation of the turbine disk disclosed in the above-mentioned embodiment of the present application are the same as the method for online monitoring of the global strain field of high-speed rotation of the turbine disk disclosed in the above-mentioned embodiment of the present application. Please refer to the corresponding parts of the method for online monitoring of the global strain field of high-speed rotation of the turbine disk provided in the above-mentioned embodiment of the present application, and no further details will be given here.

[0122] An embodiment of the present application further provides a storage medium, which includes stored instructions, wherein when the instructions are executed, the device where the storage medium is located is controlled to execute the above-mentioned method for online monitoring of the global strain field during high-speed rotation of the turbine disk.

[0123] The present application also provides an electronic device, whose structural diagram is as follows: Fig. 9 As shown, it specifically includes a memory 901 and one or more instructions 902, wherein the one or more instructions 902 are stored in the memory 901 and are configured to be executed by one or more processors 903 to perform the following operations:

[0124] Acquire a reference image and a target image of a turbine disk; the turbine disk is pre-sprayed with speckles, the reference image is an image captured before the turbine disk performs a rotation test, and the target image is an image captured when the turbine disk performs a rotation test;

[0125] determining a surface displacement field of the turbine disk according to speckle pixels in the reference image and speckle pixels in the target image;

[0126] According to the surface displacement field of the turbine disk, the global strain field of the turbine disk is obtained.

[0127] It should be noted that each embodiment in this specification is described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other. For the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0128] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations.

[0129] For the convenience of description, the above device is described in various units according to their functions. Of course, when implementing the present application, the functions of each unit can be implemented in the same or multiple software and / or hardware.

[0130] It can be known from the description of the above implementation methods that those skilled in the art can clearly understand that the present application can be implemented by means of software plus a necessary general hardware platform. Based on such an understanding, the technical solution of the present application can be essentially or partly contributed to the prior art in the form of a software product, which can be stored in a storage medium such as ROM / RAM, a magnetic disk, an optical disk, etc., and includes several instructions for enabling a computer device (which can be a personal computer, a server, etc.) to execute the methods described in the various embodiments of the present application or certain parts of the embodiments.

[0131] The above is a detailed introduction to a method for online monitoring of the global strain field of a turbine disk at high speed rotation provided by the present application. This article uses specific examples to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea; at the same time, for general technical personnel in this field, based on the ideas of the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A method for online monitoring of global strain field of a turbine disk rotating at high speed, characterized in that: include: Acquire a reference image and a target image of a turbine disk; the turbine disk is pre-sprayed with speckles, the reference image is an image captured before the turbine disk performs a rotation test, and the target image is an image captured when the turbine disk performs a rotation test; determining a surface displacement field of the turbine disk according to speckle pixels in the reference image and speckle pixels in the target image; According to the surface displacement field of the turbine disk, the global strain field of the turbine disk is obtained.

2. The method according to claim 1, characterized in that Acquire targeted images of turbine disks, including: During the process of performing the rotation test on the turbine disk, detecting the test state of the turbine disk; When it is detected that the test state of the turbine disk meets the preset acquisition condition, an image of the turbine disk is acquired to obtain a target image of the turbine disk.

3. The method according to claim 2, characterized in that The process of detecting that the test state of the turbine disk meets the preset acquisition condition includes: When it is detected that the test time of the turbine disk reaches the preset target time, it is determined that the test state of the turbine disk meets the preset collection condition.

4. The method according to claim 2, characterized in that: The process of detecting that the test state of the turbine disk meets the preset acquisition condition includes: When it is detected that the test rotation speed of the turbine disk reaches a preset target test rotation speed, it is determined that the test state of the turbine disk meets a preset acquisition condition.

5. The method according to claim 1, characterized in that The step of determining the surface displacement field of the turbine disk according to the speckle pixels in the reference image and the speckle pixels in the target image comprises: Determining relevant pixel information between the reference image and the target image; the relevant pixel information includes a first speckle pixel in the reference image and a second speckle pixel in the target image corresponding to the first speckle pixel; Determining a displacement vector of a surface point of the turbine disk according to relevant pixel information between the reference image and the target image; A surface displacement field of the turbine disk is determined based on displacement vectors of surface points of the turbine disk.

6. The method according to claim 1, characterized in that The step of obtaining the global strain field of the turbine disk according to the surface displacement field of the turbine disk comprises: Obtaining a displacement gradient of the turbine disk according to a surface displacement field of the turbine disk; The global strain field of the turbine disk is determined according to the displacement gradient of the turbine disk.

7. The method according to claim 6, characterized in that The step of obtaining the displacement gradient of the turbine disk according to the surface displacement field of the turbine disk comprises: constructing a displacement gradient matrix according to the turbine disk surface displacement field; The displacement gradient matrix is ​​subjected to differential processing to obtain the displacement gradient of the turbine disk.

8. The method according to claim 6, characterized in that Determining the global strain field of the turbine disk according to the displacement gradient of the turbine disk comprises: According to the displacement gradient of the turbine disk, a circumferential strain test result and a radial strain test result of the turbine disk are obtained; The circumferential strain test results and the radial strain test results of the turbine disk are combined to form the global strain field of the turbine disk.

9. The method according to claim 1, characterized in that: After obtaining the global strain field of the turbine disk, the method further includes: Obtaining elastic-plastic theoretical calculation results of the turbine disk; Comparing the global strain field of the turbine disk with the calculation result of the elastic-plastic theory to obtain a comparison result; The comparison result is outputted.

10. The method according to claim 1, characterized in that After obtaining the global strain field of the turbine disk, the method further includes: The global strain field is displayed on a preset display interface.

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