System and method for evaluating safety of design structure of floating type offshore wind power blade
By designing a system that includes ultimate and fatigue strength safety assessment modules, the problem of structural safety assessment of floating offshore wind turbine blades in deep sea areas was solved, the safety assessment of blades under ultimate and fatigue loads was realized, and maintenance costs and risks were reduced.
Patent Information
- Application Number
- CN202510753981.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-06
- Publication Date
- 2025-09-05
AI Technical Summary
During the design phase of floating wind turbine blades in deep sea areas, existing technologies make it difficult to fully evaluate their structural safety under extreme loads and fatigue loads, resulting in difficult and risky maintenance.
A floating offshore wind turbine blade design structural safety assessment system is adopted, including an ultimate strength safety assessment module and a fatigue strength safety assessment module. Through multiple assessment modules, a comprehensive assessment of the safety of the blade under ultimate and fatigue loads is carried out to ensure that the structural design meets the standard requirements.
It provides a comprehensive blade structure safety assessment system that can identify potential problems during the design phase, guide optimization or improvement, ensure the safe and stable operation of blades in deep sea areas, and reduce maintenance costs and risks.
Smart Images
Figure CN120592818A_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the technical field of new energy wind power generation, and in particular relates to a system and method for evaluating the design structure safety of floating offshore wind turbine blades. Background Art
[0002] With the depletion of onshore and offshore wind resources, China's wind power development has shifted to deep-sea areas. Given the high construction costs and technical challenges of fixed wind turbines in water depths exceeding 60 meters, floating wind turbines have become the only viable option for deep-sea wind power development. The lower floating platform of a floating turbine is not anchored to the seabed; instead, it is controlled by a mooring system and seabed anchoring. The harsh wind and sea conditions in deep-sea areas, coupled with the combined loads of wind, waves, currents, and ice movement, place extremely high demands on the structural safety of floating offshore wind turbines.
[0003] Blades, as a key component of floating wind turbines, are the primary device for converting wind energy into electricity. Their safe and stable operation is crucial for the overall operation and power generation of the entire system. Considering the difficulty, high cost, and significant safety risks associated with repairing or upgrading blades in later stages of operation, it is essential to thoroughly assess the structural safety of floating offshore wind turbine blades during the design phase, utilizing the latest design standards and the most conservative design concepts, to prevent damage or breakage during operation. Summary of the Invention
[0004] The present invention provides a floating offshore wind turbine blade design structural safety assessment system and method, the purpose of which is to comprehensively and conservatively evaluate and calculate the structural safety factor of the blade under extreme loads and fatigue loads, to ensure that the blade can operate safely and stably in deep sea areas.
[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A floating offshore wind turbine blade design structure safety assessment system, including an ultimate strength safety assessment module and a fatigue strength safety assessment module; The ultimate strength safety assessment module is used to calculate and evaluate the safety of blades under extreme load conditions and verify whether the blade strength under extreme wind conditions within the designed operating life cycle meets the standard requirements; The fatigue strength safety assessment module is used to calculate and evaluate the safety of blades under fatigue load conditions within their 25-year operating life, and to verify whether the cumulative damage of the blades during the design operating cycle meets the standard requirements; Ultimate strength safety assessment and fatigue strength safety assessment are evaluation items used to determine whether the blade structure design meets the standard requirements. If the safety factors of both are not less than 1, it means that the structural design is reasonable. Otherwise, the structure should be optimized or improved.
[0006] A further improvement of the present invention is that the ultimate strength safety assessment module includes a structural stability assessment module, a fiber strength assessment module, an inter-fiber strength assessment module, a structural adhesive static strength assessment module, a local stability assessment module, and a sandwich material out-of-plane shear strength assessment module; The structural stability assessment module is used to assess the overall characteristic buckling value of the blade under extreme load conditions; The fiber strength assessment module is used to assess the transverse tensile and compressive safety factors of blade fiber materials under extreme load conditions; The inter-fiber strength assessment module is used to assess the longitudinal tensile and compressive safety factors of blade fiber materials under extreme characteristic load conditions; The structural adhesive static strength assessment module is used to assess the strength of the structural adhesive material used in the mold seams at the leading and trailing edges of the blade and the bonding between the web and the main beam, including the safety factor under the ultimate load and fatigue strength; The local stability assessment module is used to assess the safety factor of the blade core material's local anti-wrinkling capability under extreme load conditions; The sandwich material out-of-plane shear strength assessment module is used to assess the safety factor of the out-of-plane shear strength of the blade core material under extreme load conditions.
[0007] A further improvement of the present invention is that the blade fiber material includes glass fiber cloth, glass fiber pultruded board, carbon fiber cloth and carbon pultruded board.
[0008] A further improvement of the present invention is that the structural stability assessment module calculates the characteristic buckling value of the blade under the action of the ultimate load; the ultimate load is divided into a four-directional load condition or a multi-directional load condition; The fiber strength assessment module uses the maximum stress failure criterion to calculate the strength of the blade fiber material in the fiber direction under the action of the extreme load to assess whether the fiber will break; The inter-fiber strength assessment module uses the puck failure criterion to calculate the longitudinal inter-fiber strength of the blade fiber material under the action of the ultimate characteristic load to assess whether micro-cracks will occur between the fibers; the ultimate load represents the load without adding a safety factor; The structural adhesive static strength assessment module uses shear flow theory to calculate the bonding strength of the structural adhesive material used in the blade manufacturing process to assess whether structural adhesive cracking will occur. The strength includes static strength under ultimate load and fatigue strength under equivalent fatigue strength. The equivalent fatigue load includes loads in the swing direction when m=4 and in the flapping direction when m=14. Where m represents the slope of the blade stress-life curve. The local stability assessment module uses the sandwich wrinkling theory to calculate the strength of the blade core material under the action of the extreme load and assess whether the blade will have core wrinkling; The sandwich material out-of-plane shear strength assessment module is used to calculate the safety factor of the out-of-plane shear strength of the blade sandwich material under the extreme load condition.
[0009] A further improvement of the present invention is that the four-directional load conditions of the extreme load are maximum flapping, maximum swinging, minimum flapping and minimum swinging, and the multi-directional load conditions are twelve-directional loads and twenty-four-directional loads.
[0010] A further improvement of the present invention is that the structural adhesive material is used at the front and rear edge mold seams and at the bonding points between the web and the main beam.
[0011] A further improvement of the present invention is that the fatigue strength safety assessment module includes a structural adhesive fatigue strength assessment module, an equivalent fatigue strain assessment module and a fiber fatigue strength assessment module; The structural adhesive fatigue strength assessment module is used to assess the safety factor of the structural adhesive of the blade under equivalent fatigue load; The equivalent fatigue strain evaluation module is used to evaluate the strain level of the blade under the equivalent fatigue life load condition; The fiber fatigue strength assessment module is used to assess the safety factor of blade fiber materials under fatigue loads throughout their entire life cycle.
[0012] A further improvement of the present invention is that the structural adhesive fatigue strength assessment module calculates the fatigue safety strength of the structural adhesive under the equivalent fatigue load of the blade within 25 years, and the equivalent load adopts the load under the working conditions of m=4 and m=14; The equivalent fatigue strain assessment module is used to calculate the strain level of the blade under the equivalent fatigue load condition and evaluate its fatigue safety. The equivalent fatigue load is the load in both the flapping and shimmying directions when m=10. The fiber fatigue strength assessment module uses the cumulative damage theory to calculate the strength of the blade fiber material under the action of Markov fatigue load, and assesses whether the blade can operate safely and stably throughout its entire service life.
[0013] A further improvement of the present invention is that the Markov fatigue load includes a two-directional load matrix or a six-directional load matrix, and the two-directional load matrix is divided into flapping and shimmying directions.
[0014] A method for designing a structural safety assessment of a floating offshore wind turbine blade includes: The ultimate strength safety assessment module calculates and assesses the safety of blades under extreme load conditions, and verifies whether the blade strength under extreme wind conditions within the designed operating life cycle meets the standard requirements; The fatigue strength safety assessment module calculates and evaluates the safety of blades under fatigue load conditions within their 25-year operating life, and verifies whether the cumulative damage of the blades during the design operating cycle meets the standard requirements; The ultimate strength safety assessment and fatigue strength safety assessment are used to determine whether the blade structure design meets the standard requirements. If the safety factors of both are not less than 1, it means that the structure design is reasonable. Otherwise, the structure should be optimized or improved.
[0015] Compared with the prior art, the present invention has at least the following beneficial technical effects: This invention provides a floating offshore wind turbine blade design structural safety assessment system and method. Based on blade design standards, this system considers factors influencing design, manufacturing, and operation, resulting in a comprehensive assessment of the overall blade structural safety. The system comprehensively evaluates the structural strength of various blade material systems, including fiberglass cloth, core material, and structural adhesive, from both the ultimate and fatigue load perspectives. The system comprehensively displays the structural safety factors of various blade components and material types. For localized areas that fail to meet design standards, structural reinforcement or technical modifications can be directly implemented, providing guidance during the design phase of floating wind turbine blades. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0017] Figure 1 Schematic diagram of the structural safety assessment system designed for floating offshore wind turbine blades; Figure 2 Schematic diagram of ultimate strength safety assessment for floating offshore wind turbine blades; Figure 3 Schematic diagram of fatigue strength safety assessment of floating offshore wind turbine blades. DETAILED DESCRIPTION
[0018] Hereinafter, only certain exemplary embodiments are briefly described. As will be appreciated by those skilled in the art, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and description are to be considered as illustrative in nature and not restrictive.
[0019] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.
[0020] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.
[0021] In the present invention, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.
[0022] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is lower in level than the second feature.
[0023] It should also be understood that the terms used in the present specification are only for the purpose of describing particular embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms unless the context clearly indicates otherwise.
[0024] It should be further understood that the term "and / or" used in the present description and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.
[0025] The accompanying drawings illustrate various schematic diagrams of structures according to embodiments disclosed herein. These figures are not drawn to scale; for clarity, some details are exaggerated and some details may be omitted. The shapes of the various regions and layers shown in the figures, as well as their relative sizes and positional relationships, are merely exemplary and may deviate in practice due to manufacturing tolerances or technical limitations. Those skilled in the art may design regions / layers with different shapes, sizes, and relative positions as needed.
[0026] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.
[0027] Example 1 Reference Figure 1-3 The present invention provides a floating offshore wind turbine blade design structure safety assessment system, which includes a blade ultimate strength safety assessment and a blade fatigue strength safety assessment. The ultimate strength safety assessment includes a structural stability assessment module, a fiber strength assessment module, an inter-fiber strength assessment module, a structural adhesive static strength assessment module, a local stability assessment module, and a sandwich material out-of-plane shear strength assessment module; the fatigue strength safety assessment includes a structural adhesive fatigue strength assessment module, an equivalent fatigue strain assessment module, and a fiber fatigue strength assessment module.
[0028] In the following content, the ultimate load data adopts twelve directions (0º, 30º, 60º, 90º, 120º, 150º, 180º, 210º, 240º, 270º, 300º, 330º) and the fatigue load adopts two directions (flapping and shimmy).
[0029] 1. Input ultimate load data to assess the ultimate strength safety of floating offshore wind turbine blades The structural stability assessment module evaluates, based on design standards, whether the blades will experience bulging or breakage during operation. Finite element simulation software is used to verify the blade's characteristic buckling value and failure mode under extreme load conditions. The minimum effective characteristic buckling value is required to be no less than 1.98 under twelve directional load conditions.
[0030] The fiber strength assessment module assesses, based on design criteria, whether chordal cracks or fractures will occur during blade operation. Utilizing the maximum stress failure criterion theory, the fiber strength coefficient of the blade under extreme loads is verified, requiring a minimum of 2.059 under twelve directional load conditions.
[0031] The inter-fiber strength assessment module assesses, at the design level, whether blades will experience axial fiber cracking or axial splitting during operation. The Puck failure criterion is used to verify the inter-fiber strength coefficient of the blade under extreme characteristic loads, requiring a minimum inter-fiber strength coefficient of 1.597 under twelve directional load conditions.
[0032] The static strength assessment module for structural adhesives assesses, at the design level, whether cracking of the structural adhesive at the leading and trailing edges and at the web bond occurs during blade operation. Shear flow theory is used to verify the strength coefficient of the structural adhesive under extreme loads, requiring a minimum of 2.677 under twelve directional load conditions.
[0033] The local stability assessment module assesses, at the design level, whether blade core wrinkling will occur during operation. Using core wrinkling theory from the aircraft design manual, the core strength coefficient of blade core materials (balsa, PVC, and PET) under extreme loads is verified. The requirement is that the local stability of the blade core material should be no less than 1.782 under twelve directional load conditions.
[0034] The core material out-of-plane shear strength assessment module evaluates, at the design level, whether the blade will experience core cracking, bulging, or other issues caused by excessive shear stress during operation. The out-of-plane shear strength of the blade core material is required to be no less than 2.265 under twelve-axis load conditions.
[0035] 2. Input fatigue load data to evaluate the fatigue strength safety of the blade The structural adhesive fatigue strength assessment module evaluates, at the design level, whether fatigue-induced cracking of the structural adhesive at the leading and trailing edges and at the web bond during blade operation is likely to occur. Shear flow theory is used to verify the structural adhesive strength coefficient under equivalent fatigue loads (m=4 and m=14), requiring a minimum strength coefficient of 1 under load in both directions.
[0036] The equivalent fatigue strain assessment module assesses, at the design level, whether fatigue-induced localized high strain in the blade casing could cause blade damage during operation. Finite element simulation is used to verify blade strain levels under an equivalent fatigue load (m=10), with 2 million equivalent cycles in the shimmy direction and 1 million cycles in the flapping direction. Under loads in both directions, the leading edge strain must not exceed 2500, the trailing edge strain must not exceed 2200, the glass beam strain must not exceed 4500, and the carbon beam strain must not exceed 4800.
[0037] The fiber fatigue strength assessment module evaluates, at the design level, whether the blade will experience fatigue damage and fracture of the fiber material due to fatigue during operation. Using cumulative damage theory, the fiber fatigue strength coefficient of the blade under Markov loads is verified, requiring that the fiber fatigue strength coefficient of the blade must not be less than 1 under loads in both directions.
[0038] 3. Blade structure safety assessment The calculated structure under the above-mentioned blade extreme load and fatigue load conditions is analyzed and evaluated, and the structure stability, fiber strength, inter-fiber strength, static strength of structural adhesive, local stability, shear strength of sandwich material, fatigue strength of structural adhesive, equivalent fatigue strain and fiber fatigue strength are output and compared with the set values of each part. When all the evaluated values meet the set values (standard requirements), it indicates that the blade structure design is reasonable and the safety meets the requirements; if one item is lower than the set value (standard requirement), it indicates that the blade structure design is unreasonable and does not meet the requirements.
[0039] Example 2 Reference Figure 1 The present invention provides a method for evaluating the structural safety of a floating offshore wind turbine blade design, comprising: The ultimate strength safety assessment module calculates and assesses the safety of blades under extreme load conditions, and verifies whether the blade strength under extreme wind conditions within the designed operating life cycle meets the standard requirements; The fatigue strength safety assessment module calculates and evaluates the safety of blades under fatigue load conditions within their 25-year operating life, and verifies whether the cumulative damage of the blades during the design operating cycle meets the standard requirements; The ultimate strength safety assessment and fatigue strength safety assessment are used to determine whether the blade structure design meets the standard requirements. If the safety factors of both are not less than 1, it means that the structure design is reasonable. Otherwise, the structure should be optimized or improved.
[0040] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, from all points of view, the embodiments should be regarded as illustrative and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes that fall within the meaning and range of equivalents of the claims are included in the present invention. Any reference signs in the claims should not be construed as limiting the claim to which they relate.
[0041] In addition, it should be understood that although this specification describes the embodiments, not every embodiment contains only one independent technical solution. This description is for clarity only. Those skilled in the art should consider the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art. The above content is only for the purpose of illustrating the technical concept of the present invention and cannot be used to limit the scope of protection of the present invention. Any changes made based on the technical solution in accordance with the technical concept proposed by the present invention fall within the scope of protection of the claims of the present invention.
Claims
1. A floating offshore wind turbine blade design structure safety assessment system, characterized by: Including ultimate strength safety assessment module and fatigue strength safety assessment module; The ultimate strength safety assessment module is used to calculate and evaluate the safety of blades under extreme load conditions and verify whether the blade strength under extreme wind conditions within the designed operating life cycle meets the standard requirements; The fatigue strength safety assessment module is used to calculate and evaluate the safety of blades under fatigue load conditions within their 25-year operating life, and to verify whether the cumulative damage of the blades during the design operating cycle meets the standard requirements; Ultimate strength safety assessment and fatigue strength safety assessment are evaluation items used to determine whether the blade structure design meets the standard requirements. If the safety factors of both are not less than 1, it means that the structural design is reasonable. Otherwise, the structure should be optimized or improved.
2. A floating offshore wind turbine blade design structure safety assessment system according to claim 1, characterized in that: The ultimate strength safety assessment module includes a structural stability assessment module, a fiber strength assessment module, an inter-fiber strength assessment module, a structural adhesive static strength assessment module, a local stability assessment module, and a sandwich material out-of-plane shear strength assessment module; The structural stability assessment module is used to assess the overall characteristic buckling value of the blade under extreme load conditions; The fiber strength assessment module is used to assess the transverse tensile and compressive safety factors of blade fiber materials under extreme load conditions; The inter-fiber strength assessment module is used to assess the longitudinal tensile and compressive safety factors of blade fiber materials under extreme characteristic load conditions; The structural adhesive static strength assessment module is used to assess the strength of the structural adhesive material used in the mold seams at the leading and trailing edges of the blade and the bonding between the web and the main beam, including the safety factor under the ultimate load and fatigue strength; The local stability assessment module is used to assess the safety factor of the blade core material's local anti-wrinkling capability under extreme load conditions; The sandwich material out-of-plane shear strength assessment module is used to assess the safety factor of the out-of-plane shear strength of the blade core material under extreme load conditions.
3. A floating offshore wind turbine blade design structure safety assessment system according to claim 2, characterized in that: Blade fiber materials include glass fiber cloth, glass fiber pultruded board, carbon fiber cloth and carbon pultruded board.
4. A floating offshore wind turbine blade design structure safety assessment system according to claim 2, characterized in that: The structural stability assessment module calculates the characteristic buckling value of the blade under the action of the ultimate load; The ultimate load is divided into four-directional load conditions or multi-directional load conditions; The fiber strength assessment module uses the maximum stress failure criterion to calculate the strength of the blade fiber material in the fiber direction under the action of the extreme load to assess whether the fiber will break; The inter-fiber strength assessment module uses the puck failure criterion to calculate the longitudinal inter-fiber strength of the blade fiber material under the action of the ultimate characteristic load, and assesses whether micro-cracks will occur between the fibers. The ultimate characteristic load represents the load without adding a safety factor; The structural adhesive static strength assessment module uses shear flow theory to calculate the bonding strength of the structural adhesive material used in the blade manufacturing process to assess whether structural adhesive cracking will occur; Its strength includes static strength under ultimate load and fatigue strength under equivalent fatigue strength; The equivalent fatigue load includes loads in the swing direction when m=4 and in the flapping direction when m=14. m represents the slope of the blade stress-life curve. The local stability assessment module is to use the sandwich wrinkling theory to calculate the strength of the blade core material under the action of the extreme load, and to assess whether the blade will have core wrinkling; The sandwich material out-of-plane shear strength assessment module is used to calculate the safety factor of the out-of-plane shear strength of the blade sandwich material under the extreme load condition.
5. A floating offshore wind turbine blade design structure safety assessment system according to claim 4, characterized in that: The four-directional load conditions of the extreme load are maximum flapping, maximum swing, minimum flapping and minimum swing, and the multi-directional load conditions are twelve-directional load or twenty-four-directional load.
6. A floating offshore wind turbine blade design structure safety assessment system according to claim 4, characterized in that: Structural adhesive materials are used in the front and rear edge mold joints and the bonding points between the web and the main beam.
7. A floating offshore wind turbine blade design structure safety assessment system according to claim 1, characterized in that: The fatigue strength safety assessment module includes the structural adhesive fatigue strength assessment module, the equivalent fatigue strain assessment module, and the fiber fatigue strength assessment module; The structural adhesive fatigue strength assessment module is used to assess the safety factor of the structural adhesive of the blade under equivalent fatigue load; The equivalent fatigue strain evaluation module is used to evaluate the strain level of the blade under the equivalent fatigue life load condition; The fiber fatigue strength assessment module is used to assess the safety factor of blade fiber materials under fatigue loads throughout their entire life cycle.
8. A floating offshore wind turbine blade design structure safety assessment system according to claim 7, characterized in that: The structural adhesive fatigue strength assessment module calculates the fatigue safety strength of the structural adhesive under equivalent fatigue load conditions within 25 years. The equivalent loads are those under conditions of m=4 and m=14. The equivalent fatigue strain assessment module is used to calculate the strain level of the blade under the equivalent fatigue load condition and evaluate its fatigue safety. The equivalent fatigue load is the load in both the flapping and shimmying directions when m=10. The fiber fatigue strength assessment module uses the cumulative damage theory to calculate the strength of the blade fiber material under the action of Markov fatigue load, and assesses whether the blade can operate safely and stably throughout its entire service life.
9. A floating offshore wind turbine blade design structure safety assessment system according to claim 8, characterized in that: The Markov fatigue load includes a two-directional load matrix or a six-directional load matrix, and the two-directional load matrix is divided into flapping and shimmying directions.
10. A method for evaluating the design structure safety of floating offshore wind turbine blades, characterized in that: include: The ultimate strength safety assessment module calculates and assesses the safety of blades under extreme load conditions, and verifies whether the blade strength under extreme wind conditions within the designed operating life cycle meets the standard requirements; The fatigue strength safety assessment module calculates and evaluates the safety of blades under fatigue load conditions within their 25-year operating life, and verifies whether the cumulative damage of the blades during the design operating cycle meets the standard requirements; The ultimate strength safety assessment and fatigue strength safety assessment are used to determine whether the blade structure design meets the standard requirements. If the safety factors of both are not less than 1, it means that the structure design is reasonable. Otherwise, the structure should be optimized or improved.