Measurement methods, systems, equipment, and media for blade installation angle after stationary rotor assembly.

Abstract

This invention discloses a method, system, equipment, and medium for measuring the blade installation angle after the stator and rotor are assembled. This method only requires acquiring the measurement curves of the leading and trailing edges of the blade, eliminating the need to scan the complete blade profile and solving the problem of poor accessibility in the measurement process. Furthermore, by acquiring the theoretical airfoil and calculating the theoretical common tangent, and using an infinite approximation algorithm based on the theoretical common tangent and the measurement curves of the leading and trailing edges, the actual common tangent is obtained. Finally, the blade installation angle is calculated based on the actual common tangent. This invention employs a custom-developed infinite approximation algorithm to solve for the actual common tangent, abandoning the traditional method of using a small circular arc to fit a large circle to solve for the common tangent. This fundamentally eliminates measurement deviations, greatly improving the accuracy and stability of the measurement results. It can accurately measure the attack angle of the blade after installation, providing important theoretical basis for understanding the impact of the quality and installation angle of aero-engine rotor and stator blade installation on engine efficiency.

Description

Technical Field

[0001] This invention relates to the field of blade installation angle measurement technology, and in particular to a method and system for measuring the blade installation angle after a stationary rotor assembly, an electronic device, and a computer-readable storage medium. Background Technology

[0002] In the assembly process of aero-engines, the installation angle (i.e., the blade's angle of attack) of integral blade disk components such as guide vanes and stationary rotor assemblies is a critical parameter affecting engine performance. Each blade requires precise measurement and real-time adjustment to meet design requirements. Currently, methods for measuring blade installation angles include:

[0003] 1) such as Figure 1 As shown, the entire cross-sectional profile of the blade is measured, and the blade installation angle α is calculated using blade parameter analysis software. This method is the most basic means of measuring and evaluating the blade installation angle, but it requires measuring the complete blade cross-sectional profile.

[0004] 2) Scan the two arc segments at the leading and trailing edges of the blade profile, then fit the measuring points of the two arc segments into two circles, and find the common tangent of the two circles to calculate the blade installation angle. This method only collects the leading and trailing edges of the blade cross-section profile, but not the blade base and blade back, resulting in an incomplete profile. Therefore, it is impossible to use blade parameter analysis software to calculate the blade installation angle.

[0005] While the first traditional method conforms to the definition of blade installation angle and guarantees accuracy, its most significant drawback lies in the extreme difficulty of actual measurement and poor accessibility. This is because the internal space of the casing is limited after the multi-stage rotor and stator assembly, leaving extremely limited room for the probe to move. Furthermore, the stator blades are often obstructed in the middle, making it impossible for the probe to extract the entire blade cross-sectional profile in most cases, thus preventing the measurement of the blade installation angle.

[0006] The second traditional method avoids the problem of measurement accessibility, but it also introduces new issues. First, the method of fitting a circle using measured leading and trailing edge curves inherently contains significant errors. As is well known, the accuracy of fitting a circle using a segment of an arc is affected by several factors. The first important factor is the proportion of the arc length to the entire circle; the larger the proportion, the closer it is to the entire circle, and the more stable the fitted result. The second important factor is the shape deviation of the arc itself; the more ideal the shape of the arc used for fitting, the smaller its shape deviation from the theoretical circle, and the more stable the fitted result. However, in reality, the leading and trailing edge arcs of the blade cross-section are less than semicircles. Furthermore, in actual measurements, to avoid the tangent transition area between the leading and trailing edges and the blade base / back, the arc length is further artificially reduced, resulting in a relatively short collected arc segment. This is because extending the scanning area to obtain a longer arc segment will incorporate some of the blade base / back curve, making the fitted circle inaccurate, causing a significant deviation in the constructed common tangent line between the leading and trailing edges, and resulting in poor measurement accuracy of the blade installation angle. Furthermore, the leading and trailing edges of the blade exhibit significant curvature variations. Within a 1mm arc, the normal direction nearly reverses by 180°. Additionally, the machining of the leading and trailing edges often results in uneven arc formation, leading to substantial shape deviations in the arc itself and consequently, significant deviations in the fitted circle. Considering these two main factors, the method of fitting a circle using the leading and trailing edges of the blade profile introduces considerable uncertainty and bias, resulting in poor measurement accuracy. Summary of the Invention

[0007] This invention provides a method and system for measuring the blade mounting angle after a stationary rotor assembly, as well as an electronic device and a computer-readable storage medium, to solve the technical problems of poor measurement accessibility and poor measurement accuracy in existing blade mounting angle measurement methods.

[0008] According to one aspect of the present invention, a method for measuring the blade mounting angle after a stationary rotor assembly is provided, comprising the following:

[0009] Obtain the measurement curves of the leading and trailing edges of the blade;

[0010] Obtain the theoretical leaf shape and calculate the theoretical common tangent;

[0011] The actual common tangent is obtained by using an infinite approximation algorithm based on the theoretical common tangent and the measured curves of the leading and trailing edges.

[0012] The blade installation angle is calculated based on the actual common tangent.

[0013] Furthermore, the process of obtaining the actual common tangent line using an infinite approximation algorithm based on the measured curves of the theoretical common tangent line and the leading and trailing edges includes the following:

[0014] Construct an initial planar coordinate system with the theoretical common tangent as the X-axis and its perpendicular as the Y-axis;

[0015] In the initial planar coordinate system, the extreme points of the front and tail edge measurement curves in the Y-axis direction are selected respectively;

[0016] Based on the two extreme points, a line is drawn connecting the two extreme points. The line connecting the two extreme points is used as the new X-axis and the perpendicular line of the line connecting the two extreme points as the new Y-axis. The initial plane coordinate system is updated, and the new extreme points of the front and tail edge measurement curves in the Y-axis direction are re-selected based on the updated plane coordinate system.

[0017] The extreme points of the plane coordinate system and the front and tail edge measurement curves are continuously updated iteratively until all other points on the front and tail edge measurement curves are located on the same side of the connecting line. Then the connecting line is the actual common tangent line.

[0018] Furthermore, during the iterative update process, the first distance value between the two extreme points of the leading edge measurement curve before and after the update and the second distance value between the two extreme points of the trailing edge measurement curve before and after the update are calculated respectively. When both the first distance value and the second distance value are less than or equal to the preset threshold, the iteration ends. When either the first distance value or the second distance value is greater than the preset threshold, the iterative update continues.

[0019] Furthermore, the leading and trailing edges of the blade are scanned using a five-axis linkage coordinate measuring machine to obtain measurement curves.

[0020] In addition, the present invention also provides a system for measuring the blade mounting angle after the stationary rotor assembly, comprising:

[0021] The measurement data acquisition module is used to acquire the measurement curves of the leading and trailing edges of the blade;

[0022] The theoretical common tangent calculation module is used to obtain the theoretical blade profile and calculate the theoretical common tangent.

[0023] The actual common tangent calculation module is used to calculate the actual common tangent based on the theoretical common tangent and the measured curves of the leading and trailing edges using an infinite approximation algorithm.

[0024] The blade installation angle calculation module is used to calculate the blade installation angle based on the actual common tangent.

[0025] Furthermore, the actual common tangent calculation module includes:

[0026] The coordinate system construction unit is used to construct an initial planar coordinate system with the theoretical common tangent as the X-axis and its perpendicular as the Y-axis.

[0027] The extreme point filtering unit is used to filter out the extreme points of the front and tail edge measurement curves in the Y-axis direction in the initial plane coordinate system.

[0028] The iterative update unit is used to draw a line connecting two extreme points, using the connecting line as the new X-axis and its perpendicular line as the new Y-axis to update the initial plane coordinate system. Based on the updated plane coordinate system, new extreme points of the front and tail edge measurement curves in the Y-axis direction are re-selected. The plane coordinate system and the extreme points of the front and tail edge measurement curves are iteratively updated until all other points on the front and tail edge measurement curves are located on the same side of the connecting line. Then the connecting line is the actual common tangent.

[0029] Furthermore, the actual common tangent calculation module also includes:

[0030] The iteration termination unit is used to calculate the first distance value between the two extreme points of the leading edge measurement curve before and after the update, and the second distance value between the two extreme points of the trailing edge measurement curve before and after the update, respectively, during the iterative update process. When both the first distance value and the second distance value are less than or equal to a preset threshold, the iteration ends. When either the first distance value or the second distance value is greater than the preset threshold, the iterative update continues.

[0031] In addition, the present invention also provides an electronic device, including a processor and a memory, wherein the memory stores a computer program, and the processor executes the steps of the method described above by calling the computer program stored in the memory.

[0032] In addition, the present invention also provides a computer-readable storage medium for storing a computer program for measuring the blade installation angle after static rotation assembly, characterized in that the computer program executes the steps of the method described above when running on a computer.

[0033] The present invention has the following effects:

[0034] The method for measuring the blade installation angle after the stator-rotor assembly of this invention only requires acquiring the measurement curves of the leading and trailing edges of the blade, without needing to scan the entire blade profile. This solves the problem of poor accessibility in the measurement process, ensures interference-free measurement, and improves measurement efficiency. Furthermore, by acquiring the theoretical airfoil and calculating the theoretical common tangent, and using an infinite approximation algorithm based on the theoretical common tangent and the measurement curves of the leading and trailing edges, the actual common tangent is obtained. Finally, the blade installation angle is calculated based on the actual common tangent. This invention employs a custom-developed infinite approximation algorithm to solve for the actual common tangent, abandoning the traditional method of using a small circular arc to fit a large circle to solve for the common tangent. This fundamentally eliminates measurement deviations, greatly improving the accuracy and stability of the measurement results. It can accurately measure the attack angle of the blade after installation, providing important theoretical basis for the quality of aero-engine rotor and stator blade installation and the impact of installation angle on engine efficiency.

[0035] In addition, the measurement system for the blade mounting angle after the static rotor assembly of the present invention also has the above-mentioned advantages.

[0036] In addition to the objectives, features, and advantages described above, the present invention has other objectives, features, and advantages. The invention will now be described in further detail with reference to the figures. Attached Figure Description

[0037] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0038] Figure 1 This is a schematic diagram of the existing complete blade cross-sectional profile.

[0039] Figure 2 This is a flowchart illustrating the method for measuring the blade mounting angle after the static rotor assembly according to a preferred embodiment of the present invention.

[0040] Figure 3 yes Figure 2 A schematic diagram of the sub-process of step S3.

[0041] Figure 4 This is a schematic diagram illustrating the principle of using an infinite approximation algorithm to solve for the common tangent in a preferred embodiment of the present invention.

[0042] Figure 5 This is a schematic diagram of the complete blade profile used for theoretical verification in a preferred embodiment of the present invention.

[0043] Figure 6 This is a schematic diagram of the measurement results using traditional methods during theoretical verification in a preferred embodiment of the present invention.

[0044] Figure 7 This is a schematic diagram of the leading and trailing edge curve segments cut from the complete blade profile during theoretical verification in a preferred embodiment of the present invention.

[0045] Figure 8 This is a schematic diagram of the measurement results obtained by using the measurement method of the present invention during theoretical verification in a preferred embodiment of the present invention.

[0046] Figure 9 This is a schematic diagram of the module structure of a measurement system for the blade mounting angle after the static rotor assembly, according to another embodiment of the present invention. Detailed Implementation

[0047] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0048] like Figure 2As shown, a preferred embodiment of the present invention provides a method for measuring the blade installation angle after the stator and rotor are combined, which is used to measure the blade installation angle after multi-stage rotor and stator assembly, and includes the following:

[0049] Step S1: Obtain the measurement curves of the leading and trailing edges of the blade;

[0050] Step S2: Obtain the theoretical leaf shape and calculate the theoretical common tangent;

[0051] Step S3: Based on the theoretical common tangent and the measured curves of the leading and trailing edges, the actual common tangent is obtained using an infinite approximation algorithm;

[0052] Step S4: Calculate the blade installation angle based on the actual common tangent.

[0053] It is understood that the method for measuring the blade installation angle after the stator-rotor assembly in this embodiment only requires obtaining the measurement curves of the leading and trailing edges of the blade, without needing to scan the complete blade profile. This solves the problem of poor accessibility in the measurement process, ensures interference-free measurement, and improves measurement efficiency. Furthermore, by obtaining the theoretical airfoil and calculating the theoretical common tangent, and using an infinite approximation algorithm based on the theoretical common tangent and the measurement curves of the leading and trailing edges, the actual common tangent is obtained. Finally, the blade installation angle is calculated based on the actual common tangent. This invention employs a custom-developed infinite approximation algorithm to solve for the actual common tangent, abandoning the traditional method of using a small circular arc to fit a large circle to solve for the common tangent. This eliminates measurement deviation in principle, greatly improving the accuracy and stability of the measurement results. It can accurately measure the attack angle after blade installation, providing important theoretical basis for the quality of aero-engine rotor and stator blade installation and the impact of installation angle on engine efficiency.

[0054] It is understood that in step S1, the leading and trailing edges of the blade are scanned using a five-axis coordinate measuring machine to obtain the measurement curves. Using a five-axis coordinate measuring machine as the digital detection and acquisition device for the blade's installation angle features offers significant advantages over traditional measurement methods, including high flexibility, high speed, accurate results, and adaptability. Preferably, the five-axis coordinate measuring machine is the German Wenzer five-axis coordinate measuring machine, which is equipped with a five-axis continuously variable indexing probe system. The probe carries an L-shaped stylus to scan the leading and trailing edge curves of the blade, enabling measurements at any angle. Furthermore, only the leading and trailing edge curves of the blade need to be scanned. Even if the leaf base and leaf back areas are scanned, since a fitted circle method is not used, the additional leaf base and leaf back data do not affect the determination of the common tangent of the blade shape, thus improving the operability in actual measurements.

[0055] It is understood that in step S2, the theoretical blade shape data is obtained and the theoretical common tangent is calculated.

[0056] Understandable, such as Figure 3 As shown, in step S3, the process of obtaining the actual common tangent line using an infinite approximation algorithm based on the measured curves of the theoretical common tangent line and the leading and trailing edges includes the following:

[0057] Step S31: Construct an initial planar coordinate system with the theoretical common tangent as the X-axis and its perpendicular as the Y-axis;

[0058] Step S32: Select the extreme points of the front and tail edge measurement curves in the Y-axis direction in the initial plane coordinate system;

[0059] Step S33: Connect the two extreme points, use the connecting line as the new X-axis and its perpendicular line as the new Y-axis to update the initial plane coordinate system, and re-select the new extreme points of the front and tail edge measurement curves in the Y-axis direction based on the updated plane coordinate system.

[0060] Step S34: Iteratively update the extreme points of the planar coordinate system and the front and tail edge measurement curves until all other points on the front and tail edge measurement curves are located on the same side of the connecting line. Then the connecting line is the actual common tangent.

[0061] For example, such as Figure 4 As shown, an initial planar coordinate system is constructed with the theoretical common tangent as the X-axis and its perpendicular as the Y-axis. The positive X-axis points from the leading edge to the trailing edge, and the positive Y-axis points from the leaf dorsal side to the leaf base side. Then, extreme points P2 and P1 on the positive Y-axis direction of the leading and trailing edge measurement curves are selected. A line is then drawn connecting P1 and P2, and this line is used as the new X-axis, with its perpendicular as the new Y-axis, to update the initial planar coordinate system, resulting in the updated coordinate system X'Y'. Based on this new coordinate system X'Y', two new extreme points P2' and P1' on the leading and trailing edge measurement curves are selected again. This process iteratively updates the planar coordinate system and extreme points until all points on the leading and trailing edge measurement curves, except for the extreme points, are located on the same side of the connecting line. This final connecting line is then considered the actual common tangent. It can be understood that when the positive Y-axis direction points from the leaf base side to the leaf dorsal side, extreme points on the negative Y-axis direction are selected.

[0062] It is understood that the infinite approximation algorithm for the common tangent of the airfoil used in this invention skips the step of fitting a circle with an arc, and directly uses the measured arc to solve for the common tangent of the airfoil, thus eliminating measurement deviation in principle and greatly improving the accuracy and stability of the measurement results.

[0063] Furthermore, since this invention employs an iterative and infinite approximation algorithm, determining the appropriate number of iterations becomes a crucial technical challenge. During the iterative update process, this invention calculates a first distance between the leading edge measurement curve and two extreme points before and after the update (e.g., the distance from extreme point P2 to extreme point P2'), and a second distance between the trailing edge measurement curve and two extreme points before and after the update (e.g., the distance from extreme point P1 to extreme point P1'). The iteration ends when both the first and second distances are less than or equal to a preset threshold; otherwise, iterative updates continue. Specifically, the preset threshold is set to 0.001 mm. When both the first and second distances are less than or equal to 0.001 mm, the common tangents obtained in the two iterations are considered to almost completely overlap. This 0.001 mm convergence condition fully considers the accuracy and stability of the measurement results, balances the precision requirements of the measured part, and also takes into account the measurement capabilities of the measuring equipment.

[0064] It is understood that this invention uses an infinite approximation algorithm to solve for the actual common tangent. It can accurately solve for the common tangent even when the measured curves of the leading and trailing edges of the blade are composed of a large number of discrete points, the lines connecting the points are not smooth, and the position of the tangent point cannot be accurately known. This is something that current general blade measurement software cannot achieve.

[0065] It can be understood that in step S4, the blade installation angle refers to the angle between the axis of the aero-engine and the common tangent of the blade. Therefore, the blade installation angle can be calculated after the actual common tangent of the blade is determined.

[0066] It is understood that, in order to verify the accuracy and reliability of the measurement method of the present invention, the inventors of this application also conducted comparative experiments.

[0067] First, theoretical verification is performed, such as... Figure 5 As shown, a complete set of blade profile data was used. Existing general blade measurement software was used to calculate the common tangent and tangential angle (i.e., blade installation angle) of the blade profile. The calculated tangential angle is 1.047°. The measurement results are as follows: Figure 6 As shown. Then, cut out the leading and trailing edge curve segments from the complete blade profile, as shown. Figure 7 As shown, the infinite approximation algorithm of this invention was then used for measurement, and the measured chord-tangent angle was also 1.047°. The measurement results of the measurement software developed based on this invention are as follows. Figure 8 As shown. Then, actual measurement verification was performed. After measuring the complete profile using the first conventional method in the background art, the blade installation angle was calculated using general blade measurement software. Simultaneously, the blade installation angle was calculated using the measurement method of this invention. Furthermore, multiple sets of comparative experiments were conducted for theoretical verification and actual measurement verification, and the experimental results are shown in Table 1.

[0068] Table 1. Theoretical verification results and actual measurement verification results of the measurement method of the present invention.

[0069]

[0070]

[0071] As can be seen from the table above, the theoretical verification results of the measurement method of this invention fully meet the requirements. In actual measurement verification, due to factors such as actual measurement error and repeatability error, although there is a deviation between the two results, the deviation value is extremely small, accounting for less than 1% of the tolerance zone of the measured element (installation angle). In the field of measurement, it is generally considered that if the deviation between the new scheme and the traditional scheme does not exceed 1 / 10 (one order of magnitude) of the tolerance zone of the measured element, the new scheme is acceptable. However, in the verification results of this invention, the actual deviation between the new scheme and the traditional scheme is two orders of magnitude higher than the tolerance zone, and the effect far exceeds expectations, making it fully applicable to actual measurement.

[0072] In addition, the inventors of this application conducted a statistical comparative analysis on the efficiency and accuracy of two traditional measurement methods in the background art and two new measurement methods using the infinite approximation algorithm of this invention, and the results are shown in Table 2.

[0073] Table 2. Comparative Analysis of Measurement Efficiency and Accuracy of Various Measurement Methods

[0074]

[0075]

[0076] As can be seen from the table above, the measurement method of the present invention not only ensures the accuracy of the measurement results, but also improves the measurement efficiency.

[0077] In addition, such as Figure 9 As shown, another embodiment of the present invention also provides a measurement system for the blade mounting angle after the stationary rotor is assembled, preferably employing the measurement method described above. The measurement system includes:

[0078] The measurement data acquisition module is used to acquire the measurement curves of the leading and trailing edges of the blade;

[0079] The theoretical common tangent calculation module is used to obtain the theoretical blade profile and calculate the theoretical common tangent.

[0080] The actual common tangent calculation module is used to calculate the actual common tangent based on the theoretical common tangent and the measured curves of the leading and trailing edges using an infinite approximation algorithm.

[0081] The blade installation angle calculation module is used to calculate the blade installation angle based on the actual common tangent.

[0082] It is understood that the measurement system for the blade installation angle after the stator-rotor assembly in this embodiment only needs to acquire the measurement curves of the leading and trailing edges of the blade, without needing to scan the complete blade profile. This solves the problem of poor accessibility in the measurement process, ensures interference-free measurement, and improves measurement efficiency. Furthermore, by acquiring the theoretical airfoil and calculating the theoretical common tangent, and using an infinite approximation algorithm based on the theoretical common tangent and the measurement curves of the leading and trailing edges, the actual common tangent is obtained. Finally, the blade installation angle is calculated based on the actual common tangent. This invention employs a custom-developed infinite approximation algorithm to solve for the actual common tangent, abandoning the traditional method of using a small circular arc to fit a large circle to solve for the common tangent. This eliminates measurement deviation in principle, greatly improving the accuracy and stability of the measurement results. It can accurately measure the attack angle of the blade after installation, providing important theoretical basis for the quality of the rotor and stator blade installation and the impact of the installation angle on engine efficiency.

[0083] It is understood that the actual common tangent calculation module includes:

[0084] The coordinate system construction unit is used to construct an initial planar coordinate system with the theoretical common tangent as the X-axis and its perpendicular as the Y-axis.

[0085] The extreme point filtering unit is used to filter out the extreme points of the front and tail edge measurement curves in the Y-axis direction in the initial plane coordinate system.

[0086] The iterative update unit is used to draw a line connecting two extreme points, using the connecting line as the new X-axis and its perpendicular line as the new Y-axis to update the initial plane coordinate system. Based on the updated plane coordinate system, new extreme points of the front and tail edge measurement curves in the Y-axis direction are re-selected. The plane coordinate system and the extreme points of the front and tail edge measurement curves are iteratively updated until all other points on the front and tail edge measurement curves are located on the same side of the connecting line. Then the connecting line is the actual common tangent.

[0087] In addition, the actual common tangent calculation module also includes:

[0088] The iteration termination unit is used to calculate the first distance value between the two extreme points of the leading edge measurement curve before and after the update, and the second distance value between the two extreme points of the trailing edge measurement curve before and after the update, respectively, during the iterative update process. When both the first distance value and the second distance value are less than or equal to a preset threshold, the iteration ends. When either the first distance value or the second distance value is greater than the preset threshold, the iterative update continues.

[0089] In addition, another embodiment of the present invention provides an electronic device including a processor and a memory, wherein the memory stores a computer program, and the processor executes the steps of the method described above by calling the computer program stored in the memory.

[0090] In addition, another embodiment of the present invention provides a computer-readable storage medium for storing a computer program for measuring the blade mounting angle after static rotation assembly, wherein the computer program executes the steps of the method described above when running on a computer.

[0091] Common computer-readable storage media include: floppy disks, flexible disks, hard disks, magnetic tapes, any other magnetic media, CD-ROMs, any other optical media, punch cards, paper tape, any other physical media with perforated patterns, random access memory (RAM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), flash erasable programmable read-only memory (FLASH-EPROM), any other memory chips or cartridges, or any other media readable by a computer. Instructions may further be transmitted or received by a transmission medium. The term transmission medium can include any tangible or intangible medium used to store, encode, or carry instructions for machine execution, and includes digital or analog communication signals or intangible media that facilitate communication of such instructions. Transmission media include coaxial cables, copper wires, and optical fibers, which contain conductors for transmitting a bus of computer data signals.

[0092] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

[0093] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code. The solutions in the embodiments of this application can be implemented in various computer languages, such as the object-oriented programming language Java and the interpreted scripting language JavaScript.

[0094] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0095] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0096] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0097] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0098] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A method for measuring the blade installation angle after a stationary rotor assembly, characterized in that, Includes the following: Obtain the measurement curves of the leading and trailing edges of the blade; Obtain the theoretical leaf shape and calculate the theoretical common tangent; The actual common tangent is obtained by using an infinite approximation algorithm based on the theoretical common tangent and the measured curves of the leading and trailing edges. The blade installation angle is calculated based on the actual common tangent. The process of obtaining the actual common tangent line using an infinite approximation algorithm based on the measured curves of the theoretical common tangent line and the leading and trailing edges includes the following: Construct an initial planar coordinate system with the theoretical common tangent as the X-axis and its perpendicular as the Y-axis; In the initial planar coordinate system, the extreme points of the front and tail edge measurement curves in the Y-axis direction are selected respectively; Based on the two extreme points, a line is drawn connecting the two extreme points. The line connecting the two extreme points is used as the new X-axis and the perpendicular line of the line connecting the two extreme points as the new Y-axis. The initial plane coordinate system is updated, and the new extreme points of the front and tail edge measurement curves in the Y-axis direction are re-selected based on the updated plane coordinate system. The extreme points of the plane coordinate system and the front and tail edge measurement curves are continuously updated iteratively until all other points on the front and tail edge measurement curves are located on the same side of the connecting line. Then the connecting line is the actual common tangent line.

2. The method for measuring the blade installation angle after the static rotor assembly as described in claim 1, characterized in that, During the iterative update process, the first distance value between the two extreme points of the leading edge measurement curve before and after the update and the second distance value between the two extreme points of the trailing edge measurement curve before and after the update are calculated respectively. When both the first distance value and the second distance value are less than or equal to the preset threshold, the iteration ends. When either the first distance value or the second distance value is greater than the preset threshold, the iterative update continues.

3. The method for measuring the blade installation angle after the static rotor assembly as described in claim 1, characterized in that, The leading and trailing edges of the blade are scanned using a five-axis coordinate measuring machine to obtain measurement curves.

4. A system for measuring the blade installation angle after a stationary rotor assembly, characterized in that, include: The measurement data acquisition module is used to acquire the measurement curves of the leading and trailing edges of the blade; The theoretical common tangent calculation module is used to obtain the theoretical blade profile and calculate the theoretical common tangent. The actual common tangent calculation module is used to calculate the actual common tangent based on the theoretical common tangent and the measured curves of the leading and trailing edges using an infinite approximation algorithm. The blade installation angle calculation module is used to calculate the blade installation angle based on the actual common tangent. The actual common tangent calculation module includes: The coordinate system construction unit is used to construct an initial planar coordinate system with the theoretical common tangent as the X-axis and its perpendicular as the Y-axis. The extreme point filtering unit is used to filter out the extreme points of the front and tail edge measurement curves in the Y-axis direction in the initial plane coordinate system. The iterative update unit is used to draw a line connecting two extreme points, using the connecting line as the new X-axis and its perpendicular line as the new Y-axis to update the initial plane coordinate system. Based on the updated plane coordinate system, new extreme points of the front and tail edge measurement curves in the Y-axis direction are re-selected. The plane coordinate system and the extreme points of the front and tail edge measurement curves are iteratively updated until all other points on the front and tail edge measurement curves are located on the same side of the connecting line. Then the connecting line is the actual common tangent.

5. The system for measuring the blade mounting angle after the static rotor assembly as described in claim 4, characterized in that, The actual common tangent calculation module also includes: The iteration termination unit is used to calculate the first distance value between the two extreme points of the leading edge measurement curve before and after the update, and the second distance value between the two extreme points of the trailing edge measurement curve before and after the update, respectively, during the iterative update process. When both the first distance value and the second distance value are less than or equal to a preset threshold, the iteration ends. When either the first distance value or the second distance value is greater than the preset threshold, the iterative update continues.

6. An electronic device, characterized in that, The method includes a processor and a memory, wherein the memory stores a computer program, and the processor executes the steps of the method as described in any one of claims 1 to 3 by calling the computer program stored in the memory.

7. A computer-readable storage medium for storing a computer program for measuring the blade installation angle after static rotation assembly, characterized in that, The computer program, when run on a computer, performs the steps of the method as described in any one of claims 1 to 3.

Images