Blade damage analysis method, system, control device and storage medium

Abstract

The present application relates to the technical field of wind turbine blades, and specifically provides a blade damage analysis method, system, control device and storage medium, aiming to solve the technical problem of poor blade damage analysis effect in the prior art. To this end, the blade damage analysis method of the present application includes: obtaining external load information and attribute information of the blade to be analyzed; determining the first state parameter of the blade as a whole based on a preset beam unit finite element model, external load information and attribute information; determining the second state parameter of the cross section of the blade based on a preset beam section model and the first state parameter; determining the third state parameter of the microscopic unit of the blade based on a preset microscopic representative volume unit model and the second state parameter; and performing damage analysis on the blade based on the first state parameter, the second state parameter and the third state parameter. Through the present application, a comprehensive damage analysis of the blade can be performed from the dimensions of the blade as a whole, the blade cross section and the microscopic units inside the blade.

Description

Technical Field

[0001] The present application relates to the technical field of wind turbine blades, and specifically provides a blade damage analysis method, system, control device and storage medium. Background Art

[0002] Blades are the most critical components of wind turbines. Blade damage affects the safe operation of wind turbines, poses a great challenge to the economy and safety of the units, and can lead to huge economic losses in severe cases.

[0003] At present, the assessment of blade damage mainly relies on imaging technology, which is used to analyze damage after taking photos of the damaged parts of the blade. This method can only qualitatively observe and detect defects on the blade surface, or replace the damaged blades and then conduct detailed positioning, classification and quantitative assessment of the damage. This problem of untimely and incomplete analysis of blade damage brings great difficulties to the operation and maintenance of wind turbine blades.

[0004] Accordingly, the art needs a new blade damage analysis method, system, control device and storage medium solution to solve the above problems. Summary of the invention

[0005] In order to overcome the above-mentioned defects, the present application is proposed to provide a blade damage analysis method, system, control device and storage medium that solve or at least partially solve the technical problem of poor blade damage analysis effect in the prior art.

[0006] In a first aspect, the present application provides a blade damage analysis method, the method comprising:

[0007] Obtain external load information and property information of the blade to be analyzed;

[0008] Determine the first state parameter of the whole blade based on the preset beam unit finite element model, the external load information and the attribute information;

[0009] Determining a second state parameter of a cross section of the blade based on a preset beam cross section model and the first state parameter;

[0010] Determining a third state parameter of the microscopic unit of the blade based on a preset microscopic representative volume unit model and the second state parameter;

[0011] A damage analysis is performed on the blade based on the first state parameter, the second state parameter, and the third state parameter.

[0012] In a technical solution of the above blade damage analysis method, the external load information includes at least the load amount under the external load condition, the attribute information includes at least the geometric attribute of the blade, and the determining of the overall first state parameter of the blade based on the preset beam unit finite element model, the external load information and the attribute information includes:

[0013] Based on the preset beam unit finite element model, the load and the geometric properties, the overall stress, strain, displacement and deformation of the blade are determined, and the first state parameter at least includes the stress, strain, displacement and deformation.

[0014] In a technical solution of the above blade damage analysis method, determining the second state parameter of the cross section of the blade based on the preset beam cross section model and the first state parameter includes:

[0015] For any cross-section of the blade, based on the preset control equation, the first state parameter and the preset beam cross-section model, the macro stress of any preset first reference point on the cross-section is determined, and the second state parameter at least includes the macro stress of all the preset first reference points.

[0016] In a technical solution of the above blade damage analysis method, the micro unit includes at least one preset first reference point and the included first reference point is recorded as the second reference point, and the third state parameter of the micro unit of the blade is determined based on the preset micro representative volume unit model and the second state parameter, including:

[0017] Based on the preset microscopic representative volume unit model and the stress of each second reference point, the mesoscopic stress of the reference point is determined, and the third state parameter at least includes the mesoscopic stresses of all the second reference points.

[0018] In a technical solution of the above blade damage analysis method, after determining the third state parameter of the microscopic unit of the blade, the method further includes:

[0019] Determining whether there is a third reference point among all the second reference points, wherein the mesoscopic stress of the third reference point satisfies a preset first condition;

[0020] If not, new external load information is obtained, and based on the attribute information and the new external load information, the steps of determining the first state parameter, determining the second state parameter, and determining the third state parameter are re-executed until the third reference point exists.

[0021] In a technical solution of the above blade damage analysis method, the attribute information further includes at least material attributes, the preset microscopic representative volume unit model corresponds to the material attributes, and if the third reference point exists, the method further includes:

[0022] Based on preset rules, the material properties corresponding to the micro-units are degraded and adjusted to obtain degraded material properties;

[0023] Based on the degraded material properties, updating the preset microscopic representative volume unit model;

[0024] For the micro-unit, applying the load corresponding to the micro-unit again;

[0025] Determining the mesoscopic stress of the third reference point based on the load corresponding to the microscopic unit and the updated preset microscopic representative volume unit model;

[0026] Determine whether the microscopic stress of the third reference point meets the preset second condition. If so, determine that the load corresponding to the microscopic unit is the maximum load, and perform damage analysis on the blade based on the maximum load, the first state parameter, the second state parameter and the third state parameter.

[0027] In a technical solution of the above-mentioned blade damage analysis method, if it is determined that the mesoscopic stress of the third reference point does not satisfy the preset second condition, new external load information is obtained, and the step of determining the mesoscopic stress of the third reference point is re-executed until the mesoscopic stress of the third reference point satisfies the preset second condition.

[0028] In a second aspect, the present application provides a blade damage analysis system, the system comprising:

[0029] An acquisition module, wherein the acquisition module is configured to acquire external load information and property information of the blade to be analyzed;

[0030] A processing module, wherein the processing module is configured to: determine a first state parameter of the entire blade based on a preset beam unit finite element model, the external load information, and the attribute information; determine a second state parameter of a cross section of the blade based on a preset beam section model and the first state parameter; determine a third state parameter of a microscopic unit of the blade based on a preset microscopic representative volume unit model and the second state parameter;

[0031] An analysis module is configured to perform damage analysis on the blade based on the first state parameter, the second state parameter, and the third state parameter.

[0032] In a third aspect, a control device is provided, which includes a processor and a storage device, wherein the storage device is suitable for storing multiple program codes, and the program codes are suitable for being loaded and run by the processor to execute the blade damage analysis method described in any one of the technical solutions of the above-mentioned blade damage analysis method.

[0033] In a fourth aspect, a computer-readable storage medium is provided, wherein a plurality of program codes are stored therein, wherein the program codes are suitable for being loaded and run by a processor to execute the blade damage analysis method described in any one of the technical solutions of the above-mentioned blade damage analysis method.

[0034] One or more of the above technical solutions of the present application have at least the following beneficial effects:

[0035] In the technical solution of the present application, the first state parameter of the whole blade to be analyzed, the second state parameter of the cross section of the blade to be analyzed, and the third state parameter of the microscopic unit of the blade to be analyzed are first determined in sequence, and then the damage analysis of the blade is performed based on the determined first state parameter, second state parameter, and third state parameter. Through the present application, the damage analysis of the blade can be performed from the dimensions of the whole blade, the cross section of the blade, and the microscopic unit inside the blade before the actual damage occurs to the blade, thereby achieving the technical effect of comprehensive analysis and prediction in advance.

[0036] Furthermore, in the technical solution of the present application, among the second reference points contained in all microscopic units, it is determined whether there is a third reference point whose microscopic stress satisfies the preset first condition, that is, relatively vulnerable microscopic units are screened out among all microscopic units. If there is no third reference point, new external load information is obtained, that is, a new external load is reapplied to highlight the vulnerable microscopic units. Through the present application, vulnerable microscopic units can be screened out, so that the vulnerable microscopic units can be analyzed in a targeted manner to determine more representative third state parameters, thereby improving the accuracy of blade damage analysis. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The disclosure of the present application will become more easily understood with reference to the accompanying drawings. It is easy for those skilled in the art to understand that these drawings are only for illustrative purposes and are not intended to limit the scope of protection of the present application. In addition, similar numbers in the drawings are used to represent similar components, among which:

[0038] Figure 1 is a schematic flow chart of the main steps of a blade damage analysis method according to an embodiment of the present application;

[0039] Figure 2 It is a schematic flow chart of the main steps of determining the maximum load of a micro unit according to an embodiment of the present application;

[0040] Figure 3 is a schematic diagram of a program flow of a blade damage analysis method according to an embodiment of the present application;

[0041] Figure 4 It is a schematic diagram of the main structural block diagram of a blade damage analysis system according to an embodiment of the present application.

[0042] Reference numerals list :

[0043] 11: Acquisition module; 12: Processing module; 13: Analysis module. DETAILED DESCRIPTION

[0044] Some embodiments of the present application are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present application and are not intended to limit the protection scope of the present application.

[0045] In the description of the present application, "module" and "processor" may include hardware, software or a combination of the two. A module may include hardware circuits, various suitable sensors, communication ports, memory, and may also include software parts, such as program code, or a combination of software and hardware. The processor may be a central processing unit, a microprocessor, an image processor, a digital signal processor or any other suitable processor. The processor has data and / or signal processing functions. The processor may be implemented in software, hardware or a combination of the two. Non-temporary computer-readable storage media include any suitable medium that can store program code, such as a disk, a hard disk, an optical disk, a flash memory, a read-only memory, a random access memory, etc. The term "A and / or B" means all possible combinations of A and B, such as only A, only B or A and B. The term "at least one A or B" or "at least one of A and B" has a similar meaning to "A and / or B" and may include only A, only B or A and B. The singular terms "one" and "the" may also include plural forms.

[0046] Please see attached Figure 1 and attached Figure 3 , Figure 1 is a schematic flow chart of the main steps of a blade damage analysis method according to an embodiment of the present application. Figure 3 FIG. 1 is a flowchart of a blade damage analysis method according to an embodiment of the present application. Figure 1 As shown, the blade damage analysis method in the embodiment of the present application mainly includes the following steps S1 to S5.

[0047] Step S1: obtaining external load information and property information of the blade to be analyzed;

[0048] In this embodiment, the external load information is the load information from the outside applied to the blade to be analyzed; the attribute information refers to the inherent attributes of the blade itself, such as geometric parameters, material parameters, performance parameters, etc.

[0049] Step S2: determining the first state parameter of the entire blade based on a preset beam unit finite element model, external load information and attribute information;

[0050] In this embodiment, the preset beam unit priority element model is a pre-generated one-dimensional beam model. For the construction of the one-dimensional finite element numerical model, according to the Timoshenko beam theory, the geometric model of the selected beam unit is constructed and the coordinate system is established. It is assumed that the cross section is not perpendicular to the elastic axis after bending deformation. Through the constitutive relationship and equilibrium equation of the Timoshenko beam, the shape function, stiffness matrix, mass matrix and dynamic toughening matrix of the Timoshenko beam unit are derived, and the finite element numerical model of the one-dimensional beam can be established. The overall first state parameter of the blade refers to the relevant parameters of the blade such as stress strain, displacement, deformation, etc. in the overall dimension of the blade.

[0051] In one embodiment, the external load information includes at least the load under the external load condition, and the attribute information includes at least the geometric attributes of the blade. Based on the preset beam unit finite element model, the load and the geometric attributes, the overall stress, strain, displacement and deformation of the blade are determined, wherein the first state parameter includes at least the above stress, strain, displacement and deformation.

[0052] Step S3: determining a second state parameter of the cross section of the blade based on the preset beam cross section model and the first state parameter;

[0053] In this embodiment, the preset beam section model mainly adopts the BECAS control equation. The second state parameter of the blade section at least includes stresses in various directions corresponding to a specified point on the blade section.

[0054] In one embodiment, for any cross section of the blade, based on the preset control equation, the first state parameter and the preset beam cross section model, the macro stress of any preset first reference point on the cross section is determined, and the second state parameter at least includes the macro stress of all preset first reference points. Specifically, the displacement of a point on the cross section of the blade is decomposed into rigid body rotation and bending displacement, and the control equation can be assumed to be a linear homogeneous differential equation. Using the finite element formula, the relationship between the node bending displacement U, the strain Φ and the external six degrees of freedom θ can be expressed by the equation:

[0055]

[0056] The key variables X and Y are displacement and strain under unit stress, respectively, which can be obtained by solving the control equation:

[0057]

[0058]

[0059] The obtained variables can be used to calculate the adaptability matrix F of the beam section model: s and the stiffness matrix K s ,

[0060]

[0061]

[0062] The stiffness matrix of the anisotropic cross-section model can be constructed using the above equation:

[0063]

[0064]

[0065]

[0066]

[0067]

[0068]

[0069]

[0070]

[0071] Z e(3×6) =[I3 n e ]

[0072]

[0073]

[0074]

[0075] Step S4: determining a third state parameter of the microscopic unit of the blade based on a preset microscopic representative volume unit model and a second state parameter;

[0076] In this embodiment, the preset microscopic representative volume unit model simulates the microscopic characteristics of the material by constructing a sufficiently small representative volume unit, thereby analyzing the mechanical properties and damage behavior of the material. The third state parameter includes at least the microscopic stress of a certain point in the microscopic unit.

[0077] In one embodiment, the micro unit includes at least one preset first reference point, and the first reference point included in the micro unit is recorded as the second reference point, then the step of determining the third state parameter at least includes: based on the preset micro representative volume unit model and the stress of each second reference point, determining the micro stress of the reference point, and the third state parameter at least includes the micro stress of all second reference points. Specifically: For the cross-scale method using the representative volume element (RVE) model, the cross-scale failure criterion takes into account the anisotropy caused by the difference in fiber and matrix performance, analyzes the stress state of the fiber and matrix at the microscopic unit cell level, and defines the failure behavior of the fiber and matrix respectively. Compared with the traditional failure analysis method, the cross-scale failure method has the advantages of component (fiber, matrix) level failure, real reaction fiber and matrix material properties, and simple and effective performance reduction of each component performance. The stress obtained from the mechanical test at the laminate level is the macroscopic average stress of the fiber and matrix on the cross section, and does not reflect the stress distribution at the microscopic level. Assuming that the fibers and matrix are arranged according to certain rules, the macroscopic stress applied on the single layer can be considered to be equivalent to the stress applied on the RVE. By applying each stress component representing the macroscopic stress on the RVE boundary respectively, the stress state of the fiber and matrix can be obtained.

[0078] The conversion from macroscopic stress to microscopic stress is achieved through the stress amplification factor:

[0079]

[0080] Where (6×1) is the micro stress and macro stress vector respectively; M (6×6) is the mechanical stress amplification factor matrix caused by the difference in mechanical properties between fiber and matrix; A (6×1) is the thermal stress amplification factor matrix caused by the difference in thermal expansion coefficients between fiber and matrix. The MMF (Micro-Mechanics of Failure) theory is selected as the cross-scale failure criterion for related research, and the micro stress is used to define the damage of fiber and matrix, and the failure criterion of the fiber part is:

[0081] -C f ≤σ 11 ≤T f

[0082] The failure criterion of the base part is:

[0083]

[0084] The independent mesoscopic strength parameters T f and C f are the tensile and compressive strengths of the fiber, T m , C mand S m are the tensile, compressive and shear strengths of the matrix, respectively.

[0085] In another embodiment, after determining the third state parameter, it can also be determined whether there is a third reference point among all the second reference points, wherein the microscopic stress of the third reference point satisfies the preset first condition; if not, new external load information is obtained, and based on the attribute information and the new external load information, the steps of determining the first state parameter, determining the second state parameter, and determining the third state parameter are re-executed until there is a third reference point. In this embodiment, the preset first condition is a preset reference point failure criterion. If there is no third reference point among all the second reference points, the external load information is re-acquired, i.e., the external load is re-applied, and the steps of determining the first state parameter, the second state parameter, and the third state parameter are re-executed. In general, the re-applied external load will be greater than the external load applied last time, so that the third reference point appears among the second reference points. If there is a third reference point, please refer to the attached Figure 2 , Figure 2 FIG. 1 is a flow chart of the main steps of determining the maximum load of a micro-unit according to an embodiment of the present application. Figure 2 As shown, determining the maximum load of the micro unit mainly includes steps S41 to S45.

[0086] Step S41: Based on preset rules, the material properties corresponding to the micro-units are degraded and adjusted to obtain the degraded material properties;

[0087] Step S42: updating a preset microscopic representative volume unit model based on the degraded material properties;

[0088] Step S43: applying the load corresponding to the micro-unit again to the micro-unit;

[0089] Step S44: determining the mesoscopic stress of the third reference point based on the load corresponding to the microscopic unit and the updated preset microscopic representative volume unit model;

[0090] Step S45: Determine whether the microscopic stress at the third reference point meets the preset second condition. If so, determine that the load corresponding to the microscopic unit is the maximum load, and perform damage analysis on the blade based on the maximum load, the first state parameter, the second state parameter and the third state parameter.

[0091] exist Figure 2In the embodiment shown, the preset rule may be to degrade the material properties of the fiber / matrix part in the unit according to the corresponding reduction coefficient. For the micro unit with the third reference point, the external load is applied again to determine the micro stress of the third reference point, so as to determine whether there is a sudden drop in the load at the third reference point, that is, to determine whether the third reference point meets the preset second condition. If the preset second condition is met, the applied external load is recorded as the maximum load as one of the reference data for estimating the maximum bearing capacity of the micro unit.

[0092] In one embodiment, if the microscopic stress of the third reference point does not meet the preset second-day condition after the external load is applied, the external load information is reacquired, that is, the external load is reapplied, and the step of determining the microscopic stress of the third reference point is re-executed (also including re-executing the steps of determining the first state parameter, the second state parameter, the third state parameter, and determining whether there is a third reference point).

[0093] Step S5: performing damage analysis on the blade based on the first state parameter, the second state parameter and the third state parameter;

[0094] Through this embodiment, damage analysis of the blade can be performed from the dimensions of the blade as a whole, the blade cross section, and the microscopic units inside the blade. In one embodiment, damage analysis of the blade can also be performed based on the maximum load obtained in step S45 to determine the maximum bearing capacity of the microscopic units.

[0095] Based on the above steps S1 to S5, first determine the first state parameter of the entire blade to be analyzed, the second state parameter of the cross section of the blade to be analyzed, and the third state parameter of the microscopic unit of the blade to be analyzed, and then perform damage analysis on the blade based on the determined first state parameter, second state parameter, and third state parameter. Through the present application, damage analysis of the blade can be performed from the dimensions of the entire blade, the cross section of the blade, and the microscopic unit inside the blade before the blade is actually damaged, thereby achieving the technical effect of comprehensive analysis and prediction in advance.

[0096] So far, the blade damage analysis method provided by the present application has been fully described. It should be pointed out that although the various steps in the above embodiments are described in a specific order, those skilled in the art can understand that in order to achieve the effect of the present application, different steps do not have to be performed in such an order. They can be performed simultaneously (in parallel) or in other orders. These changes are within the scope of protection of the present application.

[0097] Furthermore, the present application also provides a blade damage analysis system.

[0098] Refer to the attached figure, Figure 4FIG. 1 is a main structural block diagram of a blade damage analysis system according to an embodiment of the present application. Figure 4 As shown, the blade damage analysis system in the embodiment of the present application mainly includes an acquisition module 11, a processing module 12 and an analysis module 13. In some embodiments, one or more of the acquisition module 11, the processing module 12 and the analysis module 13 can be combined into one module. In some embodiments, the acquisition module 11 can be configured to acquire external load information and attribute information of the blade to be analyzed. The processing module 12 can be configured to determine the first state parameter of the entire blade based on a preset beam unit finite element model, the external load information and the attribute information; determine the second state parameter of the cross section of the blade based on a preset beam section model and the first state parameter; determine the third state parameter of the microscopic unit of the blade based on a preset microscopic representative volume unit model and the second state parameter. The analysis module 13 can be configured to perform damage analysis on the blade based on the first state parameter, the second state parameter and the third state parameter.

[0099] The blade damage analysis system is used to perform Figure 1 The blade damage analysis system method embodiment shown in the figure has similar technical principles, technical problems solved and technical effects produced. Technicians in this technical field can clearly understand that for the convenience and conciseness of description, the specific working process and related instructions of the blade damage analysis system can refer to the contents described in the embodiment of the blade damage analysis system method, which will not be repeated here.

[0100] It is understood by those skilled in the art that all or part of the processes in the method for implementing the above-mentioned embodiment of the present application can also be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a computer-readable storage medium. When the computer program is executed by the processor, the steps of each of the above-mentioned method embodiments can be implemented. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable storage medium may include: any entity or device, medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory, random access memory, electric carrier signal, telecommunication signal and software distribution medium that can carry the computer program code. It should be noted that the content contained in the computer-readable storage medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable storage media do not include electric carrier signals and telecommunication signals.

[0101] Furthermore, the present application also provides a control device. In a control device embodiment according to the present application, the control device includes a processor and a storage device, the storage device can be configured to store a program for executing the blade damage analysis method of the above method embodiment, and the processor can be configured to execute the program in the storage device, which includes but is not limited to the program for executing the blade damage analysis method of the above method embodiment. For ease of explanation, only the parts related to the embodiment of the present application are shown. For specific technical details not disclosed, please refer to the method part of the embodiment of the present application. The control device can be a control device device formed by various electronic devices.

[0102] Furthermore, the present application also provides a computer-readable storage medium. In a computer-readable storage medium embodiment according to the present application, the computer-readable storage medium can be configured to store a program for executing the blade damage analysis method of the above-mentioned method embodiment, and the program can be loaded and run by the processor to implement the above-mentioned blade damage analysis method. For ease of explanation, only the parts related to the embodiment of the present application are shown. For specific technical details not disclosed, please refer to the method part of the embodiment of the present application. The computer-readable storage medium can be a storage device formed by various electronic devices. Optionally, the computer-readable storage medium in the embodiment of the present application is a non-temporary computer-readable storage medium.

[0103] Further, it should be understood that since the setting of each module is only for illustrating the functional units of the device of the present application, the physical devices corresponding to these modules may be the processor itself, or a part of the software in the processor, a part of the hardware, or a part of the combination of software and hardware. Therefore, the number of each module in the figure is only schematic.

[0104] It is understood by those skilled in the art that each module in the device can be adaptively split or merged. Such splitting or merging of specific modules will not cause the technical solution to deviate from the principle of the present application, and therefore, the technical solutions after splitting or merging will fall within the protection scope of the present application.

[0105] So far, the technical solutions of the present application have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present application is obviously not limited to these specific embodiments. Without departing from the principles of the present application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present application.

Claims

1. A blade damage analysis method, characterized in that: The method comprises: Obtain external load information and property information of the blade to be analyzed; Based on a preset beam unit finite element model, the external load information and the attribute information, determining the first state parameter of the entire blade; the external load information at least includes the load under the external load condition, and the attribute information at least includes the geometric attribute of the blade; the determining the first state parameter of the entire blade based on the preset beam unit finite element model, the external load information and the attribute information includes: determining the overall stress strain, displacement and deformation of the blade based on the preset beam unit finite element model, the load and the geometric attribute, and the first state parameter at least includes the stress strain, the displacement and the deformation; Based on a preset beam section model and the first state parameter, determining a second state parameter of the cross section of the blade; the determining the second state parameter of the cross section of the blade based on the preset beam section model and the first state parameter comprises: for any cross section of the blade, based on a preset control equation, the first state parameter and the preset beam section model, determining the macro stress of any preset first reference point on the cross section, the second state parameter at least including the macro stress of all the preset first reference points; Based on a preset microscopic representative volume unit model and the second state parameter, a third state parameter of the microscopic unit of the blade is determined; the microscopic unit includes at least one preset first reference point and the included first reference point is recorded as the second reference point, and the third state parameter of the microscopic unit of the blade is determined based on the preset microscopic representative volume unit model and the second state parameter, including: based on the preset microscopic representative volume unit model and the stress of each second reference point, the mesoscopic stress of the reference point is determined, and the third state parameter includes at least the mesoscopic stresses of all the second reference points; A damage analysis is performed on the blade based on the first state parameter, the second state parameter, and the third state parameter.

2. The blade damage analysis method according to claim 1, characterized in that: After determining the third state parameter of the microscopic unit of the blade, the method further comprises: Determining whether there is a third reference point among all the second reference points, wherein the mesoscopic stress of the third reference point satisfies a preset first condition; If not, new external load information is obtained, and based on the attribute information and the new external load information, the steps of determining the first state parameter, determining the second state parameter, and determining the third state parameter are re-executed until the third reference point exists.

3. The blade damage analysis method according to claim 2, characterized in that: The attribute information further includes at least material attributes, and the preset microscopic representative volume unit model corresponds to the material attributes. If the third reference point exists, the method further includes: Based on preset rules, the material properties corresponding to the micro-units are degraded and adjusted to obtain degraded material properties; Based on the degraded material properties, updating the preset microscopic representative volume unit model; For the micro-unit, applying the load corresponding to the micro-unit again; Determining the mesoscopic stress of the third reference point based on the load corresponding to the microscopic unit and the updated preset microscopic representative volume unit model; Determine whether the microscopic stress of the third reference point meets the preset second condition. If so, determine that the load corresponding to the microscopic unit is the maximum load, and perform damage analysis on the blade based on the maximum load, the first state parameter, the second state parameter and the third state parameter.

4. The blade damage analysis method according to claim 3, characterized in that: If it is determined that the mesoscopic stress of the third reference point does not satisfy the preset second condition, new external load information is obtained, and the step of determining the mesoscopic stress of the third reference point is re-executed until the mesoscopic stress of the third reference point satisfies the preset second condition.

5. A blade damage analysis system, characterized in that: The system comprises: An acquisition module, wherein the acquisition module is configured to acquire external load information and property information of the blade to be analyzed; A processing module, wherein the processing module is configured to: determine the first state parameter of the entire blade based on a preset beam unit finite element model, the external load information and the attribute information; determine the second state parameter of the cross section of the blade based on a preset beam section model and the first state parameter; determine the third state parameter of the microscopic unit of the blade based on a preset microscopic representative volume unit model and the second state parameter; the external load information at least includes the load under the external load condition, and the attribute information at least includes the geometric properties of the blade, and the determination of the first state parameter of the entire blade based on the preset beam unit finite element model, the external load information and the attribute information includes: determining the overall stress strain, displacement and deformation of the blade based on the preset beam unit finite element model, the load and the geometric properties, and the first state parameter at least includes the stress force strain, the displacement and the deformation; the second state parameter of the cross section of the blade determined based on the preset beam cross section model and the first state parameter includes: for any cross section of the blade, based on the preset control equation, the first state parameter and the preset beam cross section model, determining the macro stress of any preset first reference point on the cross section, the second state parameter at least includes the macro stress of all the preset first reference points; the micro unit includes at least one preset first reference point and the included first reference point is recorded as the second reference point, the third state parameter of the micro unit of the blade determined based on the preset micro representative volume unit model and the second state parameter includes: based on the preset micro representative volume unit model and the stress of each second reference point, determining the micro stress of the reference point, the third state parameter at least includes the micro stress of all the second reference points; An analysis module is configured to perform damage analysis on the blade based on the first state parameter, the second state parameter, and the third state parameter.

6. A control device, comprising a processor and a storage device, wherein the storage device is suitable for storing a plurality of program codes, characterized in that: The program code is suitable for being loaded and run by the processor to execute the blade damage analysis method according to any one of claims 1 to 4.

7. A computer-readable storage medium storing a plurality of program codes, characterized in that: The program code is suitable for being loaded and run by a processor to execute the blade damage analysis method according to any one of claims 1 to 4.

Images