Blade Load Measurement Method, Its System, and Computer-Readable Storage Medium

Abstract

An embodiment of the present application provides a method and system for measuring blade load of a fan and a computer-readable storage medium. The fan includes a hub and blades, and the blades are connected to the hub through a plurality of bolts. The method for measuring blade load includes: obtaining the total axial force received by the bolts detected by sensors provided on the bolts; determining the bolt load received by the bolts based on the total axial force received by the bolts; and determining the blade load received by the blades connected to the bolts based on the bolt load. The method for measuring blade load in the present application is simple, fast and has high accuracy.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of wind turbines, and in particular, to a method and system for measuring blade loads and a computer-readable storage medium. Background Art

[0002] With the gradual depletion of energy sources such as coal and oil, humans have increasingly emphasized the utilization of renewable energy sources. As a clean renewable energy source, wind energy has received increasing attention from countries around the world. Along with the continuous development of wind power technology, the application of wind turbine generators in the power system has been increasing. A wind turbine generator is a large device that converts wind energy into electrical energy and is usually installed in areas with rich wind energy resources.

[0003] The monitoring of blade loads is crucial for the safe operation of wind turbines. Some methods for measuring blade loads, whether using sensors such as strain gauges or gratings, require arranging the sensors on the blades, and there are certain limitations in the accuracy of the measured load compared to the actual load. Summary of the Invention

[0004] The purpose of the embodiments of the present application is to provide a method and system for measuring blade loads and a computer-readable storage medium, which are simple and fast to calculate and have high accuracy.

[0005] One aspect of the embodiments of the present application provides a method for measuring blade loads, including:

[0006] Obtaining the total axial force received by the bolt detected by the sensor provided on the bolt;

[0007] Determining the bolt load received by the bolt according to the total axial force received by the bolt; and

[0008] Determining the blade load received by the blade connected to the bolt according to the bolt load.

[0009] Optionally, the determining the bolt load received by the bolt according to the total axial force received by the bolt includes:

[0010] Determining the difference between the total axial force minus the pre-tightening force of the bolt as the actual axial force received by the bolt;

[0011] Determining the bolt load according to the actual axial force.

[0012] Optionally, the determining the bolt load according to the actual axial force includes:

[0013] The actual axial force is corrected using a correction factor to obtain the corrected axial force received by the bolt, where the correction factor is the ratio of the actual axial force of the bolt connected to the blade to the theoretical bolt axial force that the bolt theoretically receives when the blade is only under the action of gravity; and

[0014] Determine the bolt load according to the corrected axial force.

[0015] Optionally, the determining the bolt load according to the actual axial force includes:[[]]

[0016] The actual axial force is corrected using a correction factor to obtain the corrected axial force received by the bolt, where the correction factor is the ratio of the actual axial force of the bolt to the theoretical bolt axial force when the blade is in a horizontal state; and

[0017] Determine the bolt load according to the corrected axial force.

[0018] Optionally, the determining the blade load received by the blade connected to the bolt according to the bolt load includes:[[]]

[0019] Obtain the blade load according to the bolt load and the transfer function of the blade load with respect to the bolt load; where the transfer function is obtained by the following method:[[]]

[0020] The transfer function is obtained by fitting using the bolt loads received by at least two bolts.

[0021] Optionally, the obtaining the transfer function by fitting using the bolt loads received by at least two bolts includes:[[]]

[0022] Substitute the bolt loads of at least two bolts into the expression of the transfer function to be fitted respectively, and fit the transfer function according to the equality of the values of the blade loads in the expressions of the transfer functions to be fitted of at least two bolts.

[0023] Optionally, at least two bolts are distributed on the circular ring surface at the blade root, and the determining the blade load received by the blade connected to the bolt according to the bolt load includes:[[]]

[0024] Determine the components of the bolt load, where the components of the bolt load are the X-axis load component of the bolt load on the X-axis and / or the Y-axis load component on the Y-axis, the X-axis and the Y-axis are on the circular ring surface, and the origin where the X-axis and the Y-axis intersect is the center of the circular ring surface;

[0025] Based on the components of the bolt load and the transfer function of the components of the blade load with respect to the components of the bolt load, the components of the blade load are obtained; wherein, the transfer function of the components of the bolt load is obtained by the following method:

[0026] Using the components of the bolt load received by at least two of the bolts, a transfer function of the components of the blade load with respect to the components of the bolt load is obtained by fitting;

[0027] Based on the components of the blade load, the blade load is obtained.

[0028] Optionally, the determining the components of the bolt load includes:

[0029] Based on the angle between the line connecting the reference bolt and the center of the circle and the X-axis or the Y-axis, and the angle between the line connecting at least two of the bolts and the center of the circle and the line connecting the reference bolt and the center of the circle, using trigonometric functions, the X-axis load component of the bolt load received by the at least two bolts is obtained;

[0030] Based on the angle between the line connecting the reference bolt and the center of the circle and the X-axis or the Y-axis, and the angle between the line connecting at least two of the bolts and the center of the circle and the line connecting the reference bolt and the center of the circle, using trigonometric functions, the Y-axis load component of the bolt load received by the at least two bolts is obtained;

[0031] The obtaining the components of the blade load based on the components of the bolt load and the transfer function of the components of the blade load with respect to the components of the bolt load includes:

[0032] Based on the X-axis load component of the bolt load and the transfer function of the X-axis component of the blade load with respect to the X-axis load component of the bolt load, the X-axis component of the blade load is obtained;

[0033] Based on the Y-axis load component of the bolt load and the transfer function of the Y-axis component of the blade load with respect to the Y-axis load component of the bolt load, the Y-axis component of the blade load is obtained;

[0034] The using the components of the bolt load received by at least two of the bolts to fit and obtain the transfer function of the components of the blade load with respect to the components of the bolt load includes:

[0035] Using the X-axis load components of the bolt load received by the at least two bolts, a transfer function of the X-axis component of the blade load with respect to the X-axis load components of the bolt load is obtained by fitting;

[0036] Using the Y-axis load component of the bolt loads received by the at least two bolts, a transfer function of the Y-axis component of the blade load with respect to the Y-axis load component of the bolt loads;

[0037] Obtaining the blade load according to the components of the blade load includes:

[0038] Obtaining the blade load according to the X-axis component and the Y-axis component of the blade load.

[0039] Optionally, using the components of the bolt loads received by the at least two bolts, fitting to obtain a transfer function of the components of the blade load with respect to the components of the bolt loads includes:

[0040] Substituting the components of the bolt loads of at least two bolts into the expression of the transfer function to be fitted respectively, and fitting to obtain the transfer function of the components of the bolt loads according to the equality of the values of the components of the blade load in the transfer function expressions to be fitted of at least two bolts.

[0041] Another aspect of the embodiments of the present application provides a blade load measurement system: including one or more processors for implementing the above-mentioned blade load measurement method.

[0042] Another aspect of the embodiments of the present application further provides a computer-readable storage medium. A program is stored on the computer-readable storage medium, and when the program is executed by a processor, the above-mentioned blade load measurement method is implemented.

[0043] The blade load measurement method of the present application measures the total axial force of the bolts. By using the principle that the total axial force of the bolts is indirectly related to the blade load, first obtains the bolt loads according to the total axial force of the bolts, and then calculates the blade load through the bolt loads. The calculated blade load is highly accurate and the calculation is simple. Description of the Drawings

[0044] Figure 1 Is a schematic diagram of a wind turbine;

[0045] Figure 2 Is a flowchart of the blade load measurement method according to an embodiment of the present application;

[0046] Figure 3 Is a schematic diagram of a bolt distribution;

[0047] Figure 4 Is Figure 1 The specific flowchart of step S3 of the shown embodiment;

[0048] Figure 5 Is a schematic block diagram of a blade load measurement system according to an embodiment of the present application. Detailed implementation manners

[0049] Exemplary embodiments will be described in detail herein, and examples thereof are shown in the accompanying drawings. When the following description refers to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Instead, they are merely examples of devices consistent with some aspects of the present application as detailed in the appended claims.

[0050] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. Unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should be the ordinary meanings understood by those of ordinary skill in the art to which the present application belongs. The terms "first", "second", and the like used in the specification and claims of the present application do not denote any order, quantity, or importance, but are only used to distinguish different components. Similarly, the terms such as "a" or "an" do not denote a quantity limitation, but mean that there is at least one. "Plurality" or "several" means two or more. Unless otherwise specified, the terms such as "front part", "rear part", "lower part", and / or "upper part" are only for convenience of description and are not limited to one position or a spatial orientation. The terms such as "comprising" or "including" mean that the elements or items appearing before "comprising" or "including" cover the elements or items listed after "comprising" or "including" and their equivalents, and do not exclude other elements or items. The terms such as "connected" or "coupled" are not limited to physical or mechanical connections, and may include electrical connections, whether direct or indirect. The singular forms "a", "the", and "said" used in the specification and claims of the present application are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term " / and" used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0051] The blade load monitoring of a wind turbine is crucial for the safety of the wind turbine. Figure 1 For a schematic diagram of a wind turbine, please refer to Figure 1 , the wind turbine 1 includes a hub 2 and blades 3, and the blades 3 are connected to the hub 2 through a plurality of bolts. Since the blades 3 are fixed to the hub 2 by a plurality of bolts, the blade load can be indirectly reflected on the axial force received by the bolts. Therefore, by measuring the bolt axial forces of the plurality of bolts, the indirect measurement of the blade load can be achieved. The present application provides a method for measuring the blade load of a wind turbine, including steps S1 - S3. Figure 2 It is a flowchart of the method for measuring the blade load according to an embodiment of the present application.

[0052] Please refer to Figure 2 , in step S1, obtain the total axial force on the bolt detected by the sensor provided on the bolt. In some embodiments, the total axial force on the bolt can be directly monitored by a force sensor. In some other embodiments, the elongation, deformation and other factors of the bolt can also be measured by a stress-strain sensor or a distance sensor, and the magnitude of the total axial force on the bolt can be indirectly calculated. This application does not limit this. In some embodiments, the bolt to be monitored can be any one of multiple bolts on the hub, and the blade load measurement method of this application is easy to use.

[0053] In step S2, determine the bolt load on the bolt according to the total axial force on the bolt. In some embodiments, the total axial force on the bolt is not only transmitted by the blade load, but also includes other factors, such as the tightening force of the bolt, etc. At the same time, there are certain errors in the structure of the wind turbine itself, and this error feedback to the bolt may cause a greater impact. In order to eliminate the influence brought by the tightening force of the bolt, this application determines the difference between the total axial force minus the pre-tightening force of the bolt as the actual axial force on the bolt, and then determines the bolt load according to the actual axial force. The formula is F A =(F S -F V ) / Φ, where F A is the bolt load, F S is the total axial force of the bolt, F V is the tightening force of the bolt, and Φ is the relative stiffness coefficient. In this way, the influence of the tightening force of the bolt on the blade load calculation can be eliminated, and the accuracy of the blade load measurement method of this application can be improved.

[0054] In some embodiments, to further improve the accuracy, the actual axial force can be corrected by using a correction coefficient to obtain the corrected axial force on the bolt, and then the bolt load is determined according to the corrected axial force. Among them, the correction coefficient is the ratio of the actual axial force of the bolt connected to the blade to the theoretical bolt axial force that the bolt theoretically receives when the blade is only under the action of gravity. In some embodiments, the formula for the actual axial force is F A =(F S -F V) / Φ, Φ is the relative stiffness coefficient. At this time, the correction coefficient can be used to correct the theoretical relative stiffness coefficient to obtain the corrected relative stiffness coefficient of the bolt, and then the corrected relative stiffness coefficient of the bolt is used to correct the actual axial force to obtain the corrected axial force on the bolt, wherein the correction coefficient is the ratio of the actual relative stiffness coefficient of the bolt connected to the blade to the theoretical relative stiffness coefficient of the bolt when the blade is only subjected to gravity, and then the bolt load is determined based on the corrected stiffness coefficient and the actual axial force of the bolt. In other embodiments, for the convenience of calculation, the above-mentioned blade can be further in a horizontal state when it is only subjected to gravity. At this time, the blade is only subjected to gravity, and the torque of the blade on the bolt is the product of the distance L from the center of gravity of the blade to the bolt and the weight of the blade mg.

[0055] Please continue to refer to Figure 1 When the blade is in a horizontal state, the blade is only subjected to gravity. The theoretical bolt load can be obtained by theoretical calculation through moment balance. The calculation formula of the theoretical bolt load is: M = m × g × L. In some embodiments, the correction coefficient is the ratio of the actual axial force of the bolt to the theoretical axial force of the bolt when the blade is in a horizontal state. In other embodiments, the correction coefficient is the ratio of the actual relative stiffness coefficient at this time to the theoretical relative stiffness coefficient of the bolt. At this time, the actual relative stiffness coefficient can be obtained according to the actual axial force of the bolt and the calculated theoretical axial force of the bolt. The calculation formula is Φ = (F Si -F Vi ) / F Ai ', where F Si is the actual axial force of a bolt, F Vi is the actual tightening force of a bolt. Since the correction factor is the ratio of the actual relative stiffness coefficient at this time to the theoretical relative stiffness coefficient of the bolt, the correction factor formula is η = Φ / Φ'. The bolt load formula is F A =(F S -F V ) / ηΦ'. The bolt load obtained in this way is only the load caused by the bolt being affected by the gravity of the blade, eliminating the influence of other errors on the blade load calculation, further improving the accuracy, and ensuring that the final blade load is as close to the actual blade load as possible. The blade load finally calculated by the blade load measurement method of the present application has high accuracy.

[0056] In some embodiments, the measurement of the tightening force of the bolts and the calculation of the correction coefficient can be achieved during the assembly process of the wind turbine, or it can be determined by converting the axial force monitoring data when the wind turbine is in a shutdown state and the blades are in different postures, such as at 12 o'clock and 6 o'clock. At this time, the blades are not affected by wind speed and direction, and the condition that the blades are only affected by gravity required for calculating the correction coefficient can be met.

[0057] In step S3, according to the bolt load, determine the blade load received by the blade connected to the bolt. After obtaining a relatively accurate bolt load, since the blade load is directly related to the bolt load, in some embodiments, the blade load can be obtained according to the bolt load and the transfer function of the blade load with respect to the bolt load. The transfer function is obtained by the following method: using the bolt loads received by at least two bolts, fitting to obtain the transfer function. Thus, by substituting the bolt load into the transfer function of the blade load with respect to the bolt load, a relatively accurate value of the blade load can be directly obtained.

[0058] The transfer function expresses the mathematical relationship between the blade load, the bolt load, and other known parameters. In some embodiments, other known loads include bolt material parameters, etc. Since when affected by the same blade load, the bolt loads received by different bolts are different, a transfer function to be fitted between the blade load and the bolt load can be set up for at least two bolts. Since it is the same blade load, the right sides of the equations of the transfer functions to be fitted are equal, and thus the transfer function can be fitted. In some embodiments, the implementation manner of this method is: respectively substitute the bolt loads of at least two bolts into the expression of the transfer function to be fitted, and according to the equality of the values of the blade loads in the expressions of the transfer functions to be fitted for at least two bolts, fit to obtain the transfer function. In some embodiments, the at least two bolts can be three bolts, four bolts up to all the bolts. When fitting the transfer function, the more the number of expressions of the transfer function to be fitted, the more accurate the obtained transfer function. The transfer function of the present application is obtained through rigorous mathematical calculations and has a high credibility, and thus the accuracy of the obtained blade load is high.

[0059] Figure 3 For a schematic diagram of a bolt distribution, please refer to Figure 3 , in some embodiments, at least two bolts are distributed on the toroidal surface of the blade root. At this time, the bolt load and the blade load can be in any direction. A coordinate system with the center of the circle of the torus as the origin can be established, and the blade load and the bolt load are decomposed and calculated along the coordinate axes. The first quadrant of the coordinate axes can be established based on the windward side of the blade. In this embodiment, step S3 can include steps S31 - S33 at this time. Figure 4 is Figure 1 a specific flowchart of step S3 of the embodiment shown.

[0060] In step S31, the components of the bolt load are determined. The components of the bolt load are the X-axis load component of the bolt load on the X-axis and / or the Y-axis load component on the Y-axis. The X-axis and the Y-axis are on the toroidal surface, and the origin where the X-axis and the Y-axis intersect is the center of the toroidal surface. In this way, the bolt load is decomposed into the X-axis load component on the X-axis and the Y-axis load component on the Y-axis, greatly reducing the amount of calculation, and it can be realized that no matter in which direction the blade load is, the value of the blade load can be simply calculated to monitor the safety of the wind turbine.

[0061] When establishing the coordinate system, any bolt can be recorded as the reference bolt, and the included angle between the connection line of the bolt and the center of the circle and the coordinate axis and the included angle between any two evenly distributed bolts are measured to decompose the bolt load into the X-axis load component on the X-axis and the Y-axis load component on the Y-axis. In some embodiments, according to the included angle between the connection line of the reference bolt and the center of the circle and the X-axis or the Y-axis and the included angle between the connection lines of at least two bolts and the center of the circle and the connection line of the reference bolt and the center of the circle, using trigonometric functions, the X-axis load components of the bolt loads received by at least two bolts are obtained; according to the included angle between the connection line of the reference bolt and the center of the circle and the X-axis or the Y-axis and the included angle between the connection lines of at least two bolts and the center of the circle and the connection line of the reference bolt and the center of the circle, using trigonometric functions, the Y-axis load components of the bolt loads received by at least two bolts are obtained. In this way, the calculation is simple, and there is no need to obtain the included angle between each bolt and the coordinate axis.

[0062] In step S32, according to the components of the bolt load and the transfer function of the components of the blade load with respect to the components of the bolt load, the components of the blade load are obtained. The implementation manner of this embodiment is: respectively substitute the components of the bolt loads of at least two bolts into the expression of the transfer function to be fitted, and according to the equality of the values of the components of the blade load in the transfer function expressions to be fitted of at least two bolts, the transfer function of the components of the bolt load is obtained by fitting. In this way, no matter in which direction the blade load points in the coordinate system, the value of the blade load obtained through the transfer function of the components can be used to monitor the safety of the wind turbine.

[0063] In some embodiments, according to the X-axis load component of the bolt load and the transfer function of the X-axis component of the blade load with respect to the X-axis load component of the bolt load, the X-axis component of the blade load is obtained; according to the Y-axis load component of the bolt load and the transfer function of the Y-axis component of the blade load with respect to the Y-axis load component of the bolt load, the Y-axis component of the blade load is obtained. At this time, the formula of the transfer function is:

[0064]

[0065]

[0066] In the formula, F AiThe bolt load for multiple bolts, M x The X-axis component of the blade load, M y The Y-axis component of the blade load, θ is the angle between the connecting lines of two bolts and the center of the circle, ω is the angle between the reference bolt and the Y-axis, and r is the radius of the bolt group pitch circle.

[0067] In some embodiments, the transfer function of the component of the bolt load is obtained by the following method: using the components of the bolt load received by at least two bolts, fitting to obtain the transfer function of the component of the blade load with respect to the component of the bolt load;

[0068] In some embodiments, using the X-axis load component of the bolt load received by at least two bolts, fitting to obtain the transfer function of the X-axis component of the blade load with respect to the X-axis load component of the bolt load; using the Y-axis load component of the bolt load received by at least two bolts, the transfer function of the Y-axis component of the blade load with respect to the Y-axis load component of the bolt load. The X-axis component transfer function and Y-axis component transfer function of the present application are obtained through rigorous mathematical calculations, with high credibility, and the blade load obtained therefrom has high accuracy.

[0069] Since the blade load is divided into different blade load components, in step S33, the blade load is obtained according to the components of the blade load. In some embodiments, the blade load is obtained according to the X-axis component and Y-axis component of the blade load. At this time, the formula for the blade load is M′ x 2 +M′ y 2 =M′ 2 . In this way, the calculation of the blade load of the blade load measurement method of the present application is simple, and the relatively accurate blade load can be obtained through the transfer function in any direction.

[0070] The blade load measurement method of the present application measures the total axial force of the bolts. Using the principle that the total axial force of the bolts is indirectly related to the blade load, first, the bolt load is obtained according to the total axial force of the bolts, and then the blade load is calculated by calculating the bolt load. The calculated blade load has high accuracy and simple calculation.

[0071] The embodiment of the present application also provides a blade load measurement system 200, which can be applied to a wind turbine. Figure 5 The schematic block diagram of the blade load measurement system 200 according to an embodiment of the present application. As Figure 5As shown, the blade load measurement system 200 may include one or more processors 201 for implementing the blade load measurement method of any of the above embodiments. In some embodiments, the blade load measurement system 200 may include a computer-readable storage medium 202, which may store a program that can be called by the processor 201 and may include a non-volatile storage medium. In some embodiments, the blade load measurement system 200 may include a memory 203 and an interface 204. In some embodiments, the blade load measurement system 200 of the embodiments of the present application may also include other hardware according to actual applications.

[0072] The blade load measurement system 200 of the embodiments of the present application has beneficial technical effects similar to those of the above blade load measurement method. Therefore, they will not be elaborated here.

[0073] The embodiments of the present application also provide a computer-readable storage medium. A program is stored on the computer-readable storage medium, and when the program is executed by a processor, the blade load measurement method of any of the above embodiments is implemented.

[0074] The embodiments of the present application may be in the form of a computer program product implemented on one or more storage media (including but not limited to disk memories, CD-ROMs, optical memories, etc.) containing program codes. The computer-readable storage medium includes permanent and non-permanent, removable and non-removable media, and information storage can be achieved by any method or technology. The information may be computer-readable instructions, data structures, program modules, or other data. Examples of computer-readable storage media include but are not limited to: new types of memories such as phase change memory / resistive random access memory / magnetic random access memory / ferroelectric random access memory (PRAM / RRAM / MRAM / FeRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassette tapes, magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device.

[0075] The above has introduced in detail the blade load measurement method, its system, and the computer-readable storage medium provided by the embodiments of the present application. Specific examples are used herein to elaborate on the blade load measurement method, its system, and the computer-readable storage medium of the embodiments of the present application. The description of the above embodiments is only used to help understand the core idea of the present application and is not intended to limit the present application. It should be noted that for those of ordinary skill in the art in the technical field, without departing from the spirit and principle of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications should also fall within the protection scope of the appended claims of the present application.

Claims

1. A method for measuring blade load of a fan, characterized in that, The fan includes a hub and blades, and the blades are connected to the hub by a plurality of bolts. The method for measuring the blade load includes: Obtaining the total axial force received by the bolts detected by sensors provided on the bolts; Determining the bolt load received by the bolts according to the total axial force received by the bolts, wherein the difference between the determined total axial force and the pre-tightening force of the bolt is the actual axial force received by the bolt; Determining the bolt load according to the actual axial force, wherein the actual axial force is corrected by a correction coefficient to obtain the corrected axial force received by the bolt, and the correction coefficient is the ratio of the actual axial force of the bolt connected to the blade to the theoretical bolt axial force that the bolt theoretically receives when the blade is only under the action of gravity; and, determining the bolt load according to the corrected axial force; and Determining the blade load received by the blade connected to the bolt according to the bolt load.

2. The blade load measurement method according to claim 1, wherein, The determining the bolt load according to the actual axial force includes: Correcting the actual axial force by a correction coefficient to obtain the corrected axial force received by the bolt, wherein the correction coefficient is the ratio of the actual axial force of the bolt to the theoretical bolt axial force when the blade is in a horizontal state; and Determining the bolt load according to the corrected axial force.

3. The blade load measurement method according to claim 1, characterized in that, The determining the blade load received by the blade connected to the bolt according to the bolt load includes: Obtaining the blade load according to the bolt load and the transfer function of the blade load with respect to the bolt load; wherein the transfer function is obtained by the following method: Fitting the transfer function by using the bolt loads received by at least two bolts.

4. The blade load measurement method according to claim 3, wherein The fitting the transfer function by using the bolt loads received by at least two bolts includes: Substituting the bolt loads of at least two bolts into the expression of the transfer function to be fitted respectively, and fitting the transfer function according to the equality of the values of the blade loads in the expressions of the transfer function to be fitted of at least two bolts.

5. The blade load measurement method according to claim 1, wherein, At least two bolts are distributed on the toroidal surface at the blade root. The determining the blade load received by the blade connected to the bolt according to the bolt load includes: Determining the components of the bolt load, wherein the components of the bolt load are the X-axis load component of the bolt load on the X-axis and / or the Y-axis load component on the Y-axis. The X-axis and the Y-axis are on the toroidal surface, and the origin where the X-axis and the Y-axis intersect is the center of the toroidal surface; Obtaining the components of the blade load according to the components of the bolt load and the transfer function of the components of the blade load with respect to the components of the bolt load; wherein the transfer function of the components of the bolt load is obtained by the following method: Fitting the transfer function of the components of the blade load with respect to the components of the bolt load by using the components of the bolt loads received by at least two bolts; Obtaining the blade load according to the components of the blade load.

6. The blade load measurement method according to claim 5, wherein The determining the components of the bolt load includes: Based on the angle between the line connecting the reference bolt and the center of the circle and the X-axis or the Y-axis, and the angles between the lines connecting the at least two bolts and the center of the circle and the line connecting the reference bolt and the center of the circle, using trigonometric functions, obtain the X-axis load component of the bolt load received by the at least two bolts; Based on the angle between the line connecting the reference bolt and the center of the circle and the X-axis or the Y-axis, and the angles between the lines connecting the at least two bolts and the center of the circle and the line connecting the reference bolt and the center of the circle, using trigonometric functions, obtain the Y-axis load component of the bolt load received by the at least two bolts; The obtaining of the component of the blade load according to the component of the bolt load and the transfer function of the component of the blade load with respect to the component of the bolt load includes: Based on the X-axis load component of the bolt load and the transfer function of the X-axis component of the blade load with respect to the X-axis load component of the bolt load, obtain the X-axis component of the blade load; Based on the Y-axis load component of the bolt load and the transfer function of the Y-axis component of the blade load with respect to the Y-axis load component of the bolt load, obtain the Y-axis component of the blade load; The fitting of the transfer function of the component of the blade load with respect to the component of the bolt load by using the components of the bolt load received by the at least two bolts includes: Using the X-axis load components of the bolt load received by the at least two bolts, fit to obtain the transfer function of the X-axis component of the blade load with respect to the X-axis load component of the bolt load; Using the Y-axis load components of the bolt load received by the at least two bolts, the transfer function of the Y-axis component of the blade load with respect to the Y-axis load component of the bolt load; The obtaining of the blade load according to the component of the blade load includes: Based on the X-axis component and the Y-axis component of the blade load, obtain the blade load.

7. The blade load measurement method according to claim 5, wherein, The fitting of the transfer function of the component of the blade load with respect to the component of the bolt load by using the components of the bolt load received by the at least two bolts includes: Respectively substitute the components of the bolt load of at least two bolts into the expression of the transfer function to be fitted. According to the equality of the values of the components of the blade load in the expression of the transfer function to be fitted of at least two bolts, fit to obtain the transfer function of the components of the bolt load.

8. A blade load measurement system, characterized in that: Comprising one or more processors for implementing the blade load measurement method according to any one of claims 1-7.

9. A computer-readable storage medium, characterized in that, Stored thereon is a program which, when executed by the processor, implements the blade load measurement method according to any one of claims 1-7.

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