Wind power blade modeling method, device and equipment and storage medium

Abstract

The invention provides a wind power blade modeling method and device, equipment and a storage medium. The method comprises the steps that modeling parameter information of a wind power blade is acquired; constructing a finite element model of the wind power blade based on the modeling parameter information; and constructing a circular ring between each embedded bolt sleeve and the blade root flange in the finite element model, and generating a blade model of the wind power blade. According to the method, one circular ring is arranged between each embedded bolt sleeve and the blade root flange to simulate the planeness of the embedded bolt sleeve, so that the generated blade model considers the influence caused by the planeness of the embedded bolt sleeve, the blade root bolt limit and fatigue calculation can be more accurate, and the safety and reliability of a wind turbine generator are ensured.

Description

Technical Field

[0001] The present application relates to the field of modeling technology, and in particular to a method, device, equipment and storage medium for modeling a wind turbine blade. Background Art

[0002] In recent years, with the continuous development and utilization of wind energy, in order to improve power generation efficiency and capture more wind energy, wind turbine blades are developing in the direction of large-scale. During the operation of wind turbine blades, the mechanical energy is transmitted to the generator rotor through their own swinging, and then converted into electrical energy. In wind turbine blades, the root bolts are the main connecting parts between wind turbine blades and wind turbine hubs. All loads on wind turbine blades must be transmitted to the wind turbine hub through the root bolts. Therefore, the performance of the root bolts directly affects the power generation efficiency of wind turbines and the safe operation of wind turbines.

[0003] To ensure the safe operation of wind turbines, it is necessary to conduct an in-depth analysis of the root bolt connection problem. With the large-scale development of the whole machine, the insufficient strength of the blade root bolts is often one of the bottlenecks in the design and development of the unit, and it is impossible to accurately calculate the limit and fatigue of the blade root bolts. Summary of the invention

[0004] In view of this, the purpose of this application is to provide a wind turbine blade modeling method, device, equipment and storage medium, which can make the blade root bolt limit and fatigue calculation more accurate. The specific technical solution is as follows:

[0005] In a first aspect, the present application provides a wind turbine blade modeling method, the method comprising:

[0006] Acquiring modeling parameter information of the wind turbine blade;

[0007] Constructing a finite element model of the wind turbine blade based on the modeling parameter information;

[0008] A circular ring is constructed between each embedded bolt sleeve and the blade root flange in the finite element model to generate a blade model of the wind turbine blade.

[0009] In a possible implementation, the elongations of the circular rings corresponding to the embedded bolt sleeves are consistent.

[0010] In a possible implementation, the elongations of the circular rings corresponding to the embedded bolt sleeves are randomly distributed.

[0011] In a possible implementation, constructing a ring between each embedded bolt sleeve and the blade root flange in the finite element model includes:

[0012] generating a group of circular rings based on a random function, wherein the elongation of each circular ring in the group of circular rings is randomly distributed;

[0013] The circular ring is arranged between the embedded bolt sleeve and the blade root flange, and one embedded bolt sleeve corresponds to one circular ring.

[0014] In a possible implementation manner, the elongation of the circular ring corresponding to each embedded bolt sleeve presents a periodic distribution.

[0015] In a possible implementation manner, the contact form between the circular ring and the embedded bolt sleeve is binding contact.

[0016] In a possible implementation manner, the contact form between the circular ring and the blade root flange is friction contact.

[0017] In a second aspect, the present application further provides a wind turbine blade modeling device, the device comprising:

[0018] An acquisition module, used to acquire modeling parameter information of the wind turbine blade;

[0019] A construction module, used to construct a finite element model of the wind turbine blade based on the modeling parameter information;

[0020] A generating module is used to construct a circular ring between each embedded bolt sleeve and the blade root flange in the finite element model to generate a blade model of the wind turbine blade.

[0021] In a third aspect, the present application further provides a computer device, including: a memory and a processor;

[0022] Wherein, the memory is used to store computer programs;

[0023] The processor is used to execute the computer program in the memory to implement the method described in the first aspect or any one of the first aspects.

[0024] In a fourth aspect, the present application further provides a computer-readable storage medium storing instructions, which, when executed on a computer, enables the computer to execute the method described in the first aspect or any one of the first aspects.

[0025] In this application, the modeling parameter information of the wind turbine blade is obtained; the finite element model of the wind turbine blade is constructed based on the modeling parameter information; a circular ring is constructed between each embedded bolt sleeve and the blade root flange in the finite element model to generate a blade model of the wind turbine blade. This application simulates the flatness of the embedded bolt sleeve by setting a circular ring between each embedded bolt sleeve and the blade root flange, so that the generated blade model takes into account the influence of the flatness of the embedded bolt sleeve, which can make the blade root bolt limit and fatigue calculation more accurate, thereby ensuring the safety and reliability of the wind turbine. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 A schematic diagram of an existing blade-root connection model provided in an embodiment of the present application is shown;

[0028] Figure 2 A flow chart of an embodiment of a wind turbine blade modeling method provided in an embodiment of the present application is shown;

[0029] Figure 3 A schematic diagram of the structure of a finite element model provided in an embodiment of the present application is shown;

[0030] Figure 4 A schematic diagram of the structure of a blade root bolt and a hub bolt provided in an embodiment of the present application is shown;

[0031] Figure 5 A structural schematic diagram of flatness modeling of a pre-embedded bolt sleeve provided in an embodiment of the present application is shown;

[0032] Figure 6 A schematic diagram showing a distribution law of annular elongation provided in an embodiment of the present application is shown;

[0033] Figure 7 A schematic structural diagram of a wind turbine blade modeling device provided in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0035] The root connection strength of wind turbine blades needs to be given enough attention. Once the root connection fails, it will bring huge safety hazards and economic losses. To ensure the safe operation of wind turbines, it is necessary to conduct an in-depth analysis of the root bolt connection problem. With the large-scale development of the whole machine, the insufficient strength of the root bolts is often one of the bottlenecks in the design and development of the unit. At present, there are many studies on the engineering algorithms and finite element algorithms of the root bolts, but none of them consider the impact of the flatness of the embedded bolt sleeves of the root bolts. In other words, even if the design of the existing units is passed, the safety margin is often insufficient. With the development of large-scale development, the flatness of the embedded bolt sleeves of the root bolts of the root bolts is bound to affect the safety of the wind turbine. Therefore, it is imperative to evaluate the risks brought by the flatness of the embedded bolt sleeves of the root bolts of the root bolts, which is also a difficult point in analysis.

[0036] The blade root connection model of the embedded bolt sleeve is relatively complex. The existing technology does not consider the influence of the hub, etc., and mostly adopts a simplified modeling method, divides the modeling into several parts, and applies frictionless constraints on both sides of the model. Figure 1 This is the existing blade root connection model. It can be seen that the existing technology not only fails to consider the rigidity of the structure around the blade root bolt, but also fails to consider the impact caused by the flatness problem of the embedded bolt sleeve.

[0037] The embodiment of the present application provides a wind turbine blade modeling method that takes into account the flatness of the embedded bolt sleeve, and can realize parametric modeling, improve work efficiency, and make the blade root bolt connection calculation more accurate, thereby ensuring the safety and reliability of the entire wind turbine generator, which is of great significance to the effectiveness of the wind turbine blade connection and the safe and stable operation of the wind turbine set.

[0038] See also Figure 2 , shows a flow chart of a wind turbine blade modeling method provided in an embodiment of the present application, and the embodiment of the present application at least includes the following steps:

[0039] S11, obtaining modeling parameter information of wind turbine blades.

[0040] In order to correctly simulate the force, peripheral stiffness and load transfer path of the blade root bolts, the finite element model established in the embodiment of the present application may include a blade prosthesis, an embedded bolt sleeve, a blade root flange, a pitch bearing, a hub, a main shaft, a blade root bolt and a hub bolt. The blade root bolts are specifically blade root-pitch bearing bolts, and the hub bolts are specifically hub-pitch bearing bolts. The overall finite element model is as follows: Figure 3 shown.

[0041] Modeling parameter information may include the number, size, material properties, contact pairs, fixed boundaries, load constraints, and other information of each component.

[0042] S12, constructing a finite element model of the wind turbine blade based on the modeling parameter information.

[0043] The modeling of the hub and the spindle is relatively complex, and the hub and the spindle can be modeled in the modeling software to obtain the hub model and the spindle model. If the hub model and the spindle model are properly processed, it will help the meshing of the hub model and the spindle model, and can also greatly reduce the calculation time of the computer, thereby improving the calculation efficiency. Therefore, the embodiment of the present application can simplify the non-critical areas of the hub model and the spindle model, for example, removing features such as chamfers, bosses and small holes. After simplifying the hub model and the spindle model, the mesh generation tools of other software can be used to mesh the hub model and the spindle model.

[0044] Components with relatively regular shapes, such as pitch bearings, embedded bolt sleeves, blade root flanges and blade prostheses, can be completed through modeling software by performing operations such as rotation, rotation, stretching, array grid, node merging, and rigid area on regular geometric pieces.

[0045] The blade root bolts and hub bolts can be simulated using beam188 units, and the threads of the blade root bolts and hub bolts can be simulated using beam4 load parachute, where the blade root bolts are studs with variable diameters. Figure 4 The blade root bolts and hub bolts are shown. Figure 4 The left side shows the beam element diagram of the blade root bolt and hub bolt. Figure 4 The right side shows a schematic diagram of the beam element with the cross-section shape display turned on for the blade root bolt and hub bolt.

[0046] The rollers of the pitch bearing can be simulated using Link10 or combine39 units. The pitch bearing is a pressure-bearing part, so the simulation unit needs to be set to a pressure-only state.

[0047] The embedded bolt sleeve and the blade root prosthesis can be connected by node merging, which can ensure the firmness and stability of the connection and simplify the embedded bolt sleeve and its surrounding structure into a simpler model, which helps to reduce the complexity of the model and improve the analysis efficiency.

[0048] The geometric models established above are merged, contacts are established and contact pairs are set based on the modeling parameter information, fixed boundaries and load constraints are applied, etc., and the finite element model of the wind turbine blade is now created.

[0049] The embodiment of the present application uses relevant programming software to input modeling parameter information, generate modeling text, and realize parametric modeling. The blade root connection model of the embedded bolt sleeve is relatively complex, and the blade root connection design stage requires multiple iterations. The parametric modeling method helps to improve work efficiency and shorten the development cycle.

[0050] S13, constructing a circular ring between each embedded bolt sleeve and the blade root flange in the finite element model to generate a blade model of the wind turbine blade.

[0051] The flatness of the embedded bolt sleeve refers to the flatness of the surface of the embedded bolt sleeve, that is, the deviation of each point on the surface of the embedded bolt sleeve relative to a certain reference plane. The flatness of the embedded bolt sleeve directly affects the tightness of the bolt connection, the force distribution, and the overall performance and reliability of the connection system. The embodiment of the present application simulates the flatness of the embedded bolt sleeve by setting a ring between each embedded bolt sleeve and the blade root flange. Flatness modeling is as follows Figure 5 As shown, Figure 5 The upper right corner is a detailed picture of the flatness simulation. Figure 5 The lower right corner shows the overall distribution of the rings in the leaves.

[0052] One implementation of constructing the circular rings may be to construct a group of circular rings with the same elongation, that is, the elongation of the circular rings corresponding to the embedded bolt sleeves is the same. The number of the circular rings in the group is the same as the number of the embedded bolt sleeves. The specific elongation can be set according to actual conditions. For example, the elongation of the embodiment of the present application may be 1.5 millimeters (mm).

[0053] Another implementation method of constructing the circular rings is to construct a group of circular rings whose elongations are randomly distributed, that is, the elongations of the circular rings corresponding to the embedded bolt sleeves are randomly distributed.

[0054] Specifically, the embodiment of the present application can generate a group of circular rings based on a random function, the elongation of each circular ring in the group of circular rings is randomly distributed, and the circular rings are set between the embedded bolt sleeve and the blade root flange.

[0055] A random function refers to a function that can generate random numbers. The random numbers generated by the random function are used as the elongation of the ring to generate a group of rings. The specific random function can be set according to actual conditions. For example, the rand function can be used in the embodiment of the present application.

[0056] Another implementation of constructing the circular rings is to construct a group of circular rings whose elongations present a periodic distribution, that is, the elongations of the circular rings corresponding to the embedded bolt sleeves present a periodic distribution.

[0057] Specifically, the embodiment of the present application can generate a group of circular rings based on a function with periodic distribution characteristics, the elongation of each circular ring in the group of circular rings presents a periodic distribution, and the circular rings are arranged between the embedded bolt sleeve and the blade root flange.

[0058] The elongation of a group of rings is obtained by a function with periodic distribution characteristics, so that the elongation of each ring in the group of rings presents a periodic distribution. The function with periodic distribution characteristics is such as a cosine function, a sine function, etc. The specific function can be set according to actual conditions.

[0059] The distribution law of the elongation of the ring in the embodiment of the present application is as follows Figure 6 The embodiment of the present application may also set a range of elongation, and the range of elongation may be set according to actual conditions. For example, the range of elongation in the embodiment of the present application may be 1mm-1.5mm.

[0060] The ring is arranged between the embedded bolt sleeve and the blade root flange, and the contact type between the ring, the embedded bolt sleeve and the blade root flange can be set. In the embodiment of the present application, the ring and the embedded bolt sleeve can be set to be in binding contact, and the ring and the blade root flange can be set to be in friction contact.

[0061] The embodiment of the present application studies the distribution of the flatness of the embedded bolt sleeve, and compares and analyzes various situations such as overall no flatness, embedded bolt sleeve no flatness (consistent elongation), random distribution of embedded bolt sleeve flatness (2 groups of random numbers), and periodic distribution of embedded bolt sleeve flatness (2 periods and 2 phases). By summarizing the limit and fatigue data of the blade root bolts, compiling the corresponding nonlinear relationship of the bolt stress, etc., the study found that the size of the contact surface between the embedded bolt sleeve and the blade root flange has a significant impact on the blade root bolts, and the flatness of the embedded bolt sleeve will increase the limit and fatigue damage of the blade root bolts. Therefore, the influence of the flatness of the embedded bolt sleeve needs to be considered in the limit and fatigue calculation of the blade root bolts to reduce the risk of the blade root bolts in application.

[0062] In the embodiment of the present application, the modeling parameter information of the wind turbine blade is obtained; the finite element model of the wind turbine blade is constructed based on the modeling parameter information; a circular ring is constructed between each embedded bolt sleeve and the blade root flange in the finite element model to generate a blade model of the wind turbine blade. The embodiment of the present application simulates the flatness of the embedded bolt sleeve by setting a circular ring between each embedded bolt sleeve and the blade root flange, so that the generated blade model takes into account the influence of the flatness of the embedded bolt sleeve, which can make the blade root bolt limit and fatigue calculation more accurate, thereby ensuring the safety and reliability of the wind turbine.

[0063] Next, a wind turbine blade modeling device provided in an embodiment of the present application is introduced. The wind turbine blade modeling device introduced below and the wind turbine blade modeling method introduced above can refer to each other.

[0064] See also Figure 7 , shows a schematic structural diagram of a wind turbine blade modeling device provided in an embodiment of the present application, the device comprising:

[0065] An acquisition module 701 is used to acquire modeling parameter information of the wind turbine blade;

[0066] A construction module 702 is used to construct a finite element model of the wind turbine blade based on the modeling parameter information;

[0067] The generating module 703 is used to construct a circular ring between each embedded bolt sleeve and the blade root flange in the finite element model to generate a blade model of the wind turbine blade.

[0068] In the embodiment of the present application, the elongation of the circular ring corresponding to each of the embedded bolt sleeves is consistent.

[0069] In the embodiment of the present application, the elongation of the circular ring corresponding to each of the embedded bolt sleeves is randomly distributed.

[0070] In the embodiment of the present application, when the generating module 703 constructs a ring between each embedded bolt sleeve and the blade root flange in the finite element model, it is specifically used to:

[0071] generating a group of circular rings based on a random function, wherein the elongation of each circular ring in the group of circular rings is randomly distributed;

[0072] The circular ring is arranged between the embedded bolt sleeve and the blade root flange, and one embedded bolt sleeve corresponds to one circular ring.

[0073] In the embodiment of the present application, the elongation of the circular ring corresponding to each of the embedded bolt sleeves presents a periodic distribution.

[0074] In the embodiment of the present application, the contact form between the circular ring and the embedded bolt sleeve is binding contact.

[0075] In the embodiment of the present application, the contact form between the circular ring and the blade root flange is friction contact.

[0076] The embodiment of the present application also provides a computer device, including: a memory and a processor;

[0077] Wherein, the memory is used to store computer programs;

[0078] The processor is used to execute the computer program in the memory to implement the method described in the above method embodiment.

[0079] The embodiment of the present application also provides a computer-readable storage medium storing instructions, which, when executed on a computer, enables the computer to execute the method described in the above method embodiment.

[0080] In the embodiment of the present application, the acquisition module acquires the modeling parameter information of the wind turbine blade; the construction module constructs the finite element model of the wind turbine blade based on the modeling parameter information; the generation module constructs a circular ring between each embedded bolt sleeve and the blade root flange in the finite element model to generate a blade model of the wind turbine blade. The embodiment of the present application simulates the flatness of the embedded bolt sleeve by setting a circular ring between each embedded bolt sleeve and the blade root flange, so that the generated blade model takes into account the influence of the flatness of the embedded bolt sleeve, which can make the blade root bolt limit and fatigue calculation more accurate, thereby ensuring the safety and reliability of the wind turbine set.

[0081] It should be noted that the same or similar parts between the various embodiments can be referred to each other. As for the device embodiment and the system embodiment, since they are basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0082] For the above-mentioned embodiments, for the sake of simplicity, they are all described as a series of action combinations, but those skilled in the art should know that the present application is not limited by the order of the actions described, because according to the present application, some steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present application.

[0083] Finally, it should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0084] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

[0085] The above is only a preferred implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A wind turbine blade modeling method, characterized in that: The method comprises: Acquiring modeling parameter information of the wind turbine blade; Constructing a finite element model of the wind turbine blade based on the modeling parameter information; A circular ring is constructed between each embedded bolt sleeve and the blade root flange in the finite element model to generate a blade model of the wind turbine blade.

2. The method according to claim 1, characterized in that The elongation of the circular rings corresponding to the embedded bolt sleeves is consistent.

3. The method according to claim 1, characterized in that The elongation of the circular ring corresponding to each embedded bolt sleeve is randomly distributed.

4. The method according to claim 3, characterized in that The method of constructing a circular ring between each embedded bolt sleeve and the blade root flange in the finite element model comprises: generating a group of circular rings based on a random function, wherein the elongation of each circular ring in the group of circular rings is randomly distributed; The circular ring is arranged between the embedded bolt sleeve and the blade root flange, and one embedded bolt sleeve corresponds to one circular ring.

5. The method according to claim 1, characterized in that The elongation of the circular ring corresponding to each of the embedded bolt sleeves presents a periodic distribution.

6. The method according to any one of claims 1 to 5, characterized in that: The contact form between the circular ring and the embedded bolt sleeve is binding contact.

7. The method according to any one of claims 1 to 5, characterized in that: The contact form between the circular ring and the blade root flange is friction contact.

8. A wind turbine blade modeling device, characterized in that: The device comprises: An acquisition module, used to acquire modeling parameter information of the wind turbine blade; A construction module, used to construct a finite element model of the wind turbine blade based on the modeling parameter information; A generating module is used to construct a circular ring between each embedded bolt sleeve and the blade root flange in the finite element model to generate a blade model of the wind turbine blade.

9. A computer device, characterized in that: include: Memory and processor; The memory is used to store computer programs; The processor is configured to execute the computer program in the memory to implement the method according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that: The device stores instructions which, when executed on a computer, cause the computer to execute the method according to any one of claims 1 to 7.

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