Large-scale rotary equipment blade deformation measurement registration method based on fairing mark point reference

Abstract

The invention discloses a fairing mark point reference-based large-scale rotary equipment blade deformation measurement registration method, belongs to the technical field of engine blade measurement, and solves the problems that phase deviation is caused by alignment deviation of a trigger device or synchronous signal delay and the like in high-speed blade deformation field vision measurement in the prior art; and rigid body displacement is introduced in the matching process, so that the measurement accuracy of the displacement field is influenced. According to the method, a fairing with tiny deformation is selected as a reference, mark points are pasted, homogeneous coordinates of the fairing before and after deformation are obtained, a registration transformation matrix is solved, a detection point set acts on the blade after deformation to eliminate rigid body displacement, and registration is achieved. Through fairing mark point reference registration, rigid body displacement in blade deformation measurement is eliminated, the detection accuracy and reliability are improved, the efficiency is improved, and accurate support is provided for blade deformation monitoring, risk assessment and the like.

Description

Technical Field

[0001] The invention relates to the field of engine blade measurement, and in particular to a large-scale rotary equipment blade deformation measurement and registration method based on a fairing marker reference. Background Art

[0002] Aircraft engine blades are core components of mainstream aerospace propulsion systems, such as turbofan engines. They possess complex structures and primarily perform gas compression and thrust generation. They operate in extreme environments, subjecting them to high temperatures, high pressures, high-speed rotation, and complex alternating loads such as aerodynamic excitation, centrifugal forces, and thermal stresses, which can easily cause blade morphology to change. This deformation not only disrupts internal engine airflow and deviates from design operating conditions, thereby reducing system stability and thrust performance, but can also cause serious damage such as blade deformation and fracture, threatening flight safety. Therefore, blade strength and reliability are directly related to engine performance, safety, and lifespan. Real-time monitoring of blade surface deformation and strain, and understanding its deformation patterns under operating conditions, is crucial for assessing failure risks, optimizing thrust performance, and ensuring safe operation. The development of high-precision blade strain measurement technology is of great significance to the development of the aviation industry.

[0003] For the visual measurement of high-speed blade deformation field, the phase deviation in the image acquisition link causes the rigid body displacement introduced in the matching process. A large-scale rotating equipment blade deformation measurement registration method based on the fairing landmark reference is proposed to improve the accuracy of blade deformation detection. Summary of the Invention

[0004] The present invention proposes a blade deformation measurement and registration method for large-scale rotating equipment based on a fairing marker point benchmark. By selecting a fairing with a small deformation as the registration reference area, marker points are pasted on its surface, and multiple marker points are selected to obtain homogeneous coordinates before and after deformation. The registration transformation matrix is ​​solved and applied to the detection point set of the measurement area after the blade deformation to eliminate rigid body displacement. This solves the problem in the existing technology that in the visual measurement of high-speed blade deformation field, phase deviation is caused by trigger device alignment deviation or synchronization signal delay, and then rigid body displacement is introduced in the matching process, affecting the accuracy of displacement field measurement.

[0005] A large-scale rotating equipment blade deformation measurement and registration method based on a fairing landmark reference comprises the following steps: S1. Select a fairing with minimal deformation as the registration reference area; S2, affixing a plurality of marking points on the surface of the fairing, and selecting the centers of at least three of the marking points as detection points; S3. Obtaining a first homogeneous coordinate set of the detection points before the blade is deformed and a second homogeneous coordinate set after the blade is deformed; S4. Solve the registration transformation matrix based on the first homogeneous coordinate set and the second homogeneous coordinate set.T ; S5, the registration transformation matrix T The spatial point set of the detection points in the measurement area after the blade deformation is applied to eliminate the influence of rigid body displacement and realize the registration of the areas before and after the blade deformation.

[0006] Furthermore, in S2, the marking points are pasted at the leading edge, trailing edge or circumferential edge area of ​​the fairing, and the number of the marking points is 3-6.

[0007] Furthermore, S3 includes the following steps: 3.1 Use a binocular stereo vision measurement system to capture images of the blade before and after deformation; 3.2 Processing the image and identifying the center position of the marker point using a circle center positioning algorithm; 3.3 Convert the center positions of the marker points into homogeneous coordinates to form the first homogeneous coordinate set and the second homogeneous coordinate set respectively.

[0008] Furthermore, in S4, solving the registration transformation matrix T includes establishing an overdetermined equation, using the homogeneous coordinates of the detection points before and after deformation as input, and driving the registration areas before and after deformation to coincide; wherein the overdetermined equation is: Obtain the homogeneous coordinates of the detection point before the blade is deformed And the deformed homogeneous coordinates ; Solving the registration transformation matrix T The equation is:

[0009] in, N is the serial number of the registration reference point.

[0010] Furthermore, in S5, the registration transformation matrix is ​​completed T After solving the registration transformation matrix T The spatial point set of detection points in the measurement area after the blade deformation The registration, .

[0011] Furthermore, between S4 and S5, it also includes: S4.5. Use digital image correlation (DIC) to obtain a spatial point set of detection points in the measurement area after the blade is deformed.

[0012] Furthermore, after S5, it also includes: S61, performing three-dimensional reconstruction on the registered blade deformation area to obtain blade deformation field data; S62. Calculate the deformation amount, strain distribution or vibration characteristics of the blade based on the blade deformation field data.

[0013] A storage medium stores a computer program, which, when executed by a processor, implements the above-mentioned large-scale rotating equipment blade deformation measurement and registration method based on a fairing marker point benchmark.

[0014] A computer device comprises: a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the above-mentioned large-scale rotating equipment blade deformation measurement and registration method based on a fairing marker reference.

[0015] Beneficial effects of the present invention: The present invention provides a large-scale rotating equipment blade deformation measurement and registration method based on the fairing mark point benchmark, which uses the fairing with a small deformation as the benchmark area and uses its surface mark points to solve the registration transformation matrix to eliminate the rigid body displacement, effectively solving the problem of rigid body displacement introduced due to phase deviation in the visual measurement of high-speed blade deformation field, and significantly improving the accuracy and reliability of blade deformation detection; at the same time, the present invention realizes registration through mark point positioning and matrix operation, thereby improving the measurement efficiency of the blade deformation field, providing accurate and effective technical support for real-time monitoring of the blade surface deformation and mastering its deformation law under working conditions, and solving the problem in the prior art that the visual measurement of high-speed blade deformation field causes phase deviation due to trigger device alignment deviation or synchronization signal delay, thereby introducing rigid body displacement in the matching process, affecting the accuracy of displacement field measurement. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic diagram of rigid body displacement; Figure 2 This is a schematic diagram of the fairing marking area; Figure 3 Schematic diagram of the registration effect. DETAILED DESCRIPTION

[0016] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0017] Reference Figure 1-Figure 3 As shown, a large-scale rotating equipment blade deformation measurement and registration method based on a fairing marker reference comprises the following steps: S1. Select a fairing with minimal deformation as the registration reference area; S2, affixing a plurality of marking points on the surface of the fairing, and selecting the centers of at least three of the marking points as detection points; S3. Obtaining a first homogeneous coordinate set of the detection points before the blade is deformed and a second homogeneous coordinate set after the blade is deformed; S4. Solve the registration transformation matrix based on the first homogeneous coordinate set and the second homogeneous coordinate set. T ; S5, the registration transformation matrix T The spatial point set of the detection points in the measurement area after the blade deformation is applied to eliminate the influence of rigid body displacement and realize the registration of the areas before and after the blade deformation.

[0018] Specifically, the present invention selects a fairing with a small deformation as the alignment reference area, sticks multiple markers on its surface and selects at least three marker centers as detection points, obtains the homogeneous coordinate set of these detection points before and after the blade deformation, and then solves the alignment transformation matrix T. The matrix is ​​then applied to the spatial point set of the detection points in the measurement area after the blade deformation to eliminate the influence of rigid body displacement, thereby achieving alignment of the areas before and after the blade deformation. This method of the present invention effectively solves the problem in the prior art that the high-speed blade deformation field visual measurement causes phase deviation due to the alignment deviation of the trigger device or the delay of the synchronization signal, thereby introducing rigid body displacement in the matching process and affecting the accuracy of the displacement field measurement, and significantly improves the accuracy and reliability of blade deformation detection; at the same time, the alignment is achieved through marker point positioning and matrix operation, the operation process is clear, and the measurement efficiency of the blade deformation field is improved, providing accurate and effective technical support for real-time monitoring of the blade surface deformation and mastering its deformation law under working conditions, which is of great significance for assessing the risk of blade failure, optimizing engine performance and ensuring flight safety.

[0019] Furthermore, in S2, the marking points are pasted at the leading edge, trailing edge or circumferential edge area of ​​the fairing, and the number of the marking points is 3-6.

[0020] Specifically, the present invention sticks 3-6 marker points on the leading edge, trailing edge or circumferential edge area of ​​the fairing. The selection of these positions takes into account the characteristic of small deformation of the fairing, and ensures the rationality and representativeness of the distribution of the marker points. The setting of 3-6 marker points avoids the operational complexity and data redundancy caused by too many marker points while ensuring the alignment accuracy, making the selection of subsequent detection points more targeted, helping to improve the accuracy of obtaining the homogeneous coordinate set, laying the foundation for the accurate solution of the alignment transformation matrix, and thus better eliminating the influence of rigid body displacement, and improving the overall efficiency and reliability of blade deformation measurement alignment.

[0021] Furthermore, S3 includes the following steps: 3.1 Use a binocular stereo vision measurement system to capture images of the blade before and after deformation; 3.2 Processing the image and identifying the center position of the marker point using a circle center positioning algorithm; 3.3 Convert the center positions of the marker points into homogeneous coordinates to form the first homogeneous coordinate set and the second homogeneous coordinate set respectively.

[0022] Specifically, the present invention adopts a binocular stereo vision measurement system to capture the state of the blade before and after deformation to obtain images, processes the images through a circle center positioning algorithm and identifies the center positions of the marker points, and then converts these center positions into homogeneous coordinates to form a set of homogeneous coordinates before and after deformation. This method fully utilizes the accuracy of binocular stereo vision technology in three-dimensional measurement, ensuring the comprehensiveness and reliability of image acquisition, and the application of the circle center positioning algorithm can accurately identify the center of the marker point, providing accurate original data for the conversion of homogeneous coordinates, so that the subsequent solution of the registration transformation matrix has a solid data foundation, which helps to more accurately eliminate the influence of rigid body displacement and further improve the accuracy and effectiveness of blade deformation measurement registration.

[0023] Furthermore, in S4, the registration transformation matrix is ​​solved T This involves establishing an overdetermined equation, using the homogeneous coordinates of the detection point before and after deformation as input to drive the registration area to coincide before and after deformation; wherein the overdetermined equation is: Obtain the homogeneous coordinates of the detection point before the blade is deformed And the deformed homogeneous coordinates ; Solving the registration transformation matrix T The equation is:

[0024] in, N is the serial number of the registration reference point.

[0025] Specifically, the present invention solves the registration transformation matrix T By establishing an overdetermined equation and taking the homogeneous coordinates of the detection points before and after deformation as input, the registration areas before and after deformation are driven to coincide. This method makes full use of the coordinate information of multiple detection points, which can effectively reduce the impact of single data errors and make the solved registration transformation matrix T more in line with the actual rigid body transformation. This provides an accurate mathematical basis for the subsequent elimination of rigid body displacement in blade deformation measurement, helps to further improve the accuracy of registration, and ensures the reliability of blade deformation field measurement results.

[0026] Furthermore, in S5, the registration transformation matrix is ​​completed T After solving the registration transformation matrix TThe spatial point set of detection points in the measurement area after the blade deformation The registration, .

[0027] Specifically, after completing the registration transformation matrix T After the solution is obtained, it is applied to the spatial point set of the detection points in the measurement area after the blade deformation for registration. This process can accurately eliminate the rigid body displacement introduced by the phase deviation, so that the measurement areas before and after the blade deformation can be effectively overlapped, thereby more clearly reflecting the actual deformation of the blade, avoiding the interference of the rigid body displacement on the deformation measurement results, and further ensuring the accuracy of the blade deformation field measurement.

[0028] Furthermore, between S4 and S5, it also includes: S4.5. Use digital image correlation (DIC) to obtain a spatial point set of detection points in the measurement area after the blade is deformed.

[0029] Specifically, the present invention solves the registration transformation matrix T And between applying it to the spatial point set of detection points in the measurement area after the blade is deformed, the step of using digital image correlation method DIC to obtain the spatial point set of detection points in the measurement area after the blade is deformed is added. This process can accurately capture the subtle features of the blade after deformation, and provide accurate and comprehensive detection point data for the subsequent application of the registration transformation matrix, making the registration operation more targeted and reliable, which helps to further improve the accuracy of blade deformation measurement registration, ensure that the measurement results after eliminating the rigid body displacement can more realistically reflect the deformation state of the blade, and lay a more solid data foundation for accurately analyzing the deformation law of the blade.

[0030] Furthermore, after S5, it also includes: S61, performing three-dimensional reconstruction on the registered blade deformation area to obtain blade deformation field data; S62. Calculate the deformation amount, strain distribution or vibration characteristics of the blade based on the blade deformation field data.

[0031] Specifically, after completing the registration of the areas before and after blade deformation, the registered blade deformation area is further reconstructed in three dimensions to obtain blade deformation field data, and the deformation amount, strain distribution or vibration characteristics of the blade are calculated based on these data. This process can convert the registration results into specific and analyzable blade deformation parameters, which not only realizes the accurate measurement of blade deformation, but also can deeply explore the deformation law of blades under working conditions, providing a comprehensive and reliable basis for evaluating blade failure risks and optimizing engine performance, so that the entire measurement and registration method forms a complete closed loop from eliminating rigid body displacement to obtaining actual deformation data and then to analysis and application.

[0032] A storage medium stores a computer program, which, when executed by a processor, implements the above-mentioned large-scale rotating equipment blade deformation measurement and registration method based on a fairing marker point benchmark.

[0033] Specifically, the storage medium provided by the present invention stores a computer program, which, when executed by a processor, can implement a blade deformation measurement and registration method for large rotating equipment based on a fairing marker point benchmark. This allows the method to be stably stored and conveniently called in the form of a computer program, making it easy to implement on different computer devices, contributing to the promotion and popularization of the measurement and registration method, and allowing more relevant scenarios to achieve accurate measurement of blade deformation with the help of this method, providing a more flexible implementation method for blade deformation detection, and further leveraging the method's role in improving measurement accuracy and efficiency.

[0034] A computer device comprises: a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the above-mentioned large-scale rotating equipment blade deformation measurement and registration method based on a fairing marker reference.

[0035] Specifically, the computer device provided by the present invention includes a memory, a processor, and a computer program stored in the memory and runnable on the processor. When the processor executes the program, it can implement a large-scale rotating equipment blade deformation measurement and registration method based on the fairing mark point benchmark, so that the measurement and registration method can run stably on actual hardware equipment. Through the execution of the program by the processor, each step in the method is converted into specific calculation and processing operations, ensuring the efficient implementation of the entire process from reference area selection, mark point processing to registration transformation matrix solution and application, providing a reliable hardware carrier for blade deformation measurement and registration, facilitating blade deformation detection work in actual scenarios, and better leveraging the advantages of this method in improving measurement accuracy and efficiency, providing strong support for mastering the blade deformation law and ensuring the safe operation of equipment.

[0036] The following is a specific example of the present invention: Due to the alignment deviation of the trigger device or the delay of the synchronization signal, the phase of the collected blade image has a certain deviation relative to the original phase, which will introduce rigid body displacement during the measurement of the blade surface deformation field and affect the measurement of the displacement field.

[0037] In order to eliminate the influence of rigid body displacement on displacement field measurement, a coordinate registration method is proposed. Since the deformation of the fairing is generally considered to be small, the fairing is selected as the registration reference area, and markers are attached to the fairing surface. Select several (more than 3) landmark points in the registration area as detection points for tracking and positioning. Take 5 detection points as an example to obtain their homogeneous coordinates before and after deformation. as well as ,in i =1~5. Using these 5 points as the registration reference points, drive the registration area before and after deformation to coincide, and establish the following equation to solve the registration transformation matrix T .

[0038]

[0039] Complete the registration transformation matrix T After solving the problem, it is applied to the detection point space set in the measurement area after the blade deformation. of the registration.

[0040]

[0041] The present invention uses a fairing with a small deformation as a reference area and uses its surface landmark points to solve the registration transformation matrix to eliminate rigid body displacement, thereby effectively solving the problem of rigid body displacement introduced due to phase deviation in the visual measurement of high-speed blade deformation field, and significantly improving the accuracy and reliability of blade deformation detection; at the same time, the present invention realizes registration through landmark point positioning and matrix operation, thereby improving the measurement efficiency of the blade deformation field, providing accurate and effective technical support for real-time monitoring of blade surface deformation and mastering its deformation law under working conditions, and solving the problem in the prior art that the visual measurement of high-speed blade deformation field causes phase deviation due to trigger device alignment deviation or synchronization signal delay, thereby introducing rigid body displacement in the matching process, affecting the accuracy of displacement field measurement.

[0042] While the specific embodiments of the present invention have been described in detail above, these are intended to be exemplary only, and the present invention is not limited thereto. Any equivalent modifications or substitutions to the present invention that would be apparent to those skilled in the art are also within the scope of the present invention. Therefore, any equivalent modifications or substitutions made without departing from the spirit and scope of the present invention are intended to be encompassed within the scope of the present invention.

Claims

1. A large-scale rotating equipment blade deformation measurement and registration method based on fairing landmark reference, characterized in that: The following steps are involved: S1. Select a fairing with minimal deformation as the registration reference area; S2, affixing a plurality of marking points on the surface of the fairing, and selecting the centers of at least three of the marking points as detection points; S3. Obtaining a first homogeneous coordinate set of the detection points before the blade is deformed and a second homogeneous coordinate set after the blade is deformed; S4. Solve the registration transformation matrix based on the first homogeneous coordinate set and the second homogeneous coordinate set. T ; S5, the registration transformation matrix T The spatial point set of the detection points in the measurement area after the blade deformation is applied to eliminate the influence of rigid body displacement and realize the registration of the areas before and after the blade deformation.

2. The large-scale rotating equipment blade deformation measurement and registration method based on the fairing mark point benchmark according to claim 1 is characterized in that: In S2, the marking points are pasted at the leading edge, trailing edge or circumferential edge area of ​​the fairing, and the number of the marking points is 3-6.

3. The large-scale rotating equipment blade deformation measurement and registration method based on the fairing mark point benchmark according to claim 2 is characterized in that: S3 includes the following steps: 3.1 Use a binocular stereo vision measurement system to capture images of the blade before and after deformation; 3.2 Processing the image and identifying the center position of the marker point using a circle center positioning algorithm; 3.3 Convert the center positions of the marker points into homogeneous coordinates to form the first homogeneous coordinate set and the second homogeneous coordinate set respectively.

4. The large-scale rotating equipment blade deformation measurement and registration method based on the fairing mark point benchmark according to claim 3 is characterized in that: In S4, solving the registration transformation matrix T includes establishing an overdetermined equation, using the homogeneous coordinates of the detection points before and after deformation as input, and driving the registration areas before and after deformation to coincide; wherein the overdetermined equation is: Obtain the homogeneous coordinates of the detection point before the blade is deformed And the deformed homogeneous coordinates ; Solving the registration transformation matrix T The equation is: in, N is the serial number of the registration reference point.

5. The large-scale rotating equipment blade deformation measurement and registration method based on the fairing mark point benchmark according to claim 4 is characterized in that: In S5, complete the registration transformation matrix T After solving the registration transformation matrix T The spatial point set of detection points in the measurement area after the blade deformation The registration, 。 6. The large-scale rotating equipment blade deformation measurement and registration method based on the fairing mark point benchmark according to claim 5 is characterized in that: Between S4 and S5, it also includes: S4.

5. Use digital image correlation (DIC) to obtain a spatial point set of detection points in the measurement area after the blade is deformed.

7. The large-scale rotating equipment blade deformation measurement and registration method based on the fairing mark point benchmark according to claim 6 is characterized in that: After S5, it also includes: S61, performing three-dimensional reconstruction on the registered blade deformation area to obtain blade deformation field data; S62. Calculate the deformation amount, strain distribution or vibration characteristics of the blade based on the blade deformation field data.

8. A storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method for measuring and registering blade deformation of large rotating equipment based on a fairing marker reference as described in any one of claims 1 to 7 is implemented.

9. A computer device, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the large-scale rotating equipment blade deformation measurement and registration method based on a fairing marker reference as described in any one of claims 1 to 7.

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