Method, device and system for determining bending rigidity of section of wind power blade

Abstract

The invention relates to a method, device and system for determining the bending rigidity of the section of a wind power blade. The method comprises the following steps: carrying out one-way static force loading on a position corresponding to a blade tip section in a finite element model of a target wind power blade according to a preset force output value; determining respective strain values of a plurality of nodes in a target blade section in the finite element model; the strain value is a strain value perpendicular to the section direction of the blade; determining a neutral axis based on the respective strain values of the plurality of nodes; determining a first distance between each node in the plurality of nodes and the neutral axis; determining a bending moment of the target section based on a preset output value; for each node, the bending rigidity of the node is determined based on the bending moment, the first distance corresponding to the node and the strain value corresponding to the node; and determining the section bending stiffness of the target blade section based on the bending stiffness of each node. According to the scheme, the accuracy of wind turbine blade section homeotropic calculation is improved.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of wind power generation, and particularly relates to a method, device and system for determining the bending stiffness of a wind turbine blade cross section. BACKGROUND

[0002] In the related art, the bending stiffness of a blade cross section is usually calculated by simplifying a complex composite material cross section into a regular geometric shape (such as a rectangle or an I-shaped section) and using a standard formula in material mechanics. However, a wind turbine blade cross section is a complex profiled thin-walled structure and is made of anisotropic composite material plies, and simplification can cause a large error. SUMMARY

[0003] To overcome the problems in the related art, the present disclosure provides a method, device and system for determining the bending stiffness of a wind turbine blade cross section.

[0004] According to a first aspect of an embodiment of the present disclosure, a method for determining the bending stiffness of a wind turbine blade cross section is provided, comprising:

[0005] unidirectional static loading is performed on a position corresponding to a tip cross section in a finite element model of a target wind turbine blade according to a preset output value;

[0006] determining respective strain values of a plurality of nodes in a target blade cross section in the finite element model; the strain values are strain values perpendicular to a direction of the blade cross section; the target blade cross section is any cross section in the finite element model except the tip cross section;

[0007] determining a neutral axis based on the respective strain values of the plurality of nodes;

[0008] determining a first distance between each node of the plurality of nodes and the neutral axis;

[0009] determining a bending moment of the target cross section based on the preset output value;

[0010] for each node, determining the bending stiffness of the node based on the bending moment, the first distance corresponding to the node and the strain value corresponding to the node;

[0011] determining the cross-sectional bending stiffness of the target blade cross section based on the bending stiffness of each node.

[0012] According to a second aspect of an embodiment of the present disclosure, a device for determining the bending stiffness of a wind turbine blade cross section is provided, comprising:

[0013] a loading unit configured to perform unidirectional static loading on a position corresponding to a tip cross section in a finite element model of a target wind turbine blade according to a preset output value;

[0014] The first determining unit is configured to determine a strain value of each node in a target blade section in the finite element model; the strain value is a strain value in a direction perpendicular to the blade section; and the target blade section is any section in the finite element model except the blade tip section.

[0015] The second determining unit is configured to determine a neutral axis based on the strain value of each node.

[0016] The third determining unit is configured to determine a first distance between each node and the neutral axis.

[0017] The fourth determining unit is configured to determine a bending moment of the target section based on the preset output value.

[0018] The fifth determining unit is configured to determine, for each node, a bending stiffness of the node based on the bending moment, the first distance corresponding to the node, and the strain value corresponding to the node.

[0019] The sixth determining unit is configured to determine a section bending stiffness of the target blade section based on the bending stiffness of each node.

[0020] According to a third aspect of embodiments of the present disclosure, an electronic device includes a memory, a processor, and a computer program stored on the memory and executable on the processor, and the processor implements the method according to any one of the first aspect when executing the computer program.

[0021] According to a fourth aspect of embodiments of the present disclosure, a computer readable storage medium is provided, and the computer readable storage medium stores a computer program, and the computer program is executable on a processor to implement the method according to any one of the first aspect.

[0022] According to a fifth aspect of embodiments of the present disclosure, a computer program product is provided, and the computer program product includes a computer program, and the computer program is executable on a processor to implement the method according to any one of the first aspect.

[0023] The technical scheme provided by the embodiment of the present disclosure can have the following beneficial effects: the position corresponding to the tip section of the finite element model of the target wind turbine blade is loaded in one direction according to the preset output value; the strain values of the nodes in the target blade section of the finite element model are determined; the strain values are strain values perpendicular to the blade section direction; the neutral axis is determined based on the strain values of the nodes; the first distance between each node in the nodes and the neutral axis is determined; the bending moment of the target section is determined based on the preset output value; for each node, the bending stiffness of the node is determined based on the bending moment, the first distance corresponding to the node, and the strain value corresponding to the node; and the section bending stiffness of the target blade section is determined based on the bending stiffness of each node. The neutral axis is determined by the strain values of different nodes obtained by loading the finite element model of the target wind turbine blade in one direction, and then the section bending stiffness is inversely calculated based on the distance between different nodes on the target blade section and the neutral axis. Since the position of the neutral axis is obtained by accurately simulating the stress process of the wind turbine blade by using the finite element model, the section bending stiffness can be accurately calculated based on the neutral axis, and the accuracy of the calculation of the wind turbine blade section is effectively improved.

[0024] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory, and are not limiting to the present disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0025] The accompanying drawings, which are incorporated into and form a part of the specification, illustrate an embodiment consistent with the present disclosure and, together with the description, serve to explain the principles of the disclosure.

[0026] Figure 1 FIG. 1 is a flowchart of a method for determining the bending stiffness of a wind turbine blade section according to an exemplary embodiment.

[0027] Figure 2 FIG. 2 is a schematic diagram of a finite element model of a target wind turbine blade according to an exemplary embodiment.

[0028] Figure 3 FIG. 3 is a block diagram of a device for determining the bending stiffness of a wind turbine blade section according to an exemplary embodiment.

[0029] Figure 4 FIG. 4 is a block diagram of a device for determining the bending stiffness of a wind turbine blade section according to an exemplary embodiment.

[0030] Reference signs

[0031] 1- finite element model of a target wind turbine blade; 2- target blade section; 3- tip section. DETAILED DESCRIPTION

[0032] The exemplary embodiments will be described in detail herein with reference to the attached drawings. The description of the exemplary embodiments is only to illustrate and not to limit the scope of the present disclosure. The following description refers to the accompanying drawings in which the same numbers in different drawings represent the same or similar elements unless otherwise represented. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present disclosure. Instead, they are merely examples of apparatuses and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0033] The terminology used in the present disclosure is merely for the purpose of describing particular embodiments and is not intended to limit the present disclosure. As used in the present disclosure and the appended claims, singular forms such as "a", "an" and "the" are intended to include plural forms as well, unless the context clearly indicates otherwise.

[0034] It should be understood that, although the terms first, second, third, etc. can be employed in describing various information, these information should not be limited to these terms. These terms are only used to distinguish one piece of information from another piece of information of the same type. For example, a first information can also be referred to as a second information, and similarly, a second information can also be referred to as a first information, without departing from the scope of the present disclosure. Depending on the context, the words "if' and "when' as used herein can be interpreted to mean "upon" or "in response to determining".

[0035] In addition, the steps can be reordered, added or deleted using various forms of flow shown in the present disclosure. For example, the steps described in the present disclosure can be executed in parallel, sequentially or in different order, as long as the desired results of the technical solutions disclosed in the present disclosure can be achieved, which is not limited herein.

[0036] Figure 1 is a flowchart of a method for determining the bending stiffness of a wind turbine blade section according to an exemplary embodiment, as shown in Figure 1 It should be noted that the method for determining the bending stiffness of a wind turbine blade section in the present disclosure is applied to a device for determining the bending stiffness of a wind turbine blade section. As shown in Figure 1 The method can include the following steps:

[0037] In step 101, the position corresponding to the tip section of the finite element model of the target wind turbine blade is unidirectionally statically loaded according to a preset output value.

[0038] In one embodiment, a three-dimensional layer finite element shell model (i.e. the above-mentioned finite element model) of the target wind turbine blade can be established in advance based on the three-dimensional layer and structure of the target wind turbine blade by using a finite element software.

[0039] The three-dimensional layup refers to a design and implementation process of orientation, stacking and arrangement of composite material layers in a three-dimensional space according to geometric shapes and mechanical performance requirements of a structure. It is one of key technologies for realizing high-performance composite material structures such as wind turbine blades.

[0040] It should be noted that static force loading can be simultaneously performed on multiple nodes of the tip section, and the sum of the assistance values of the multiple nodes is the preset output value.

[0041] In the embodiments of the present application, the cross-sectional size, layup thickness and material of the blade continuously change from the root to the tip. The root of the blade is the thickest and hardest, and the tip is the thinnest and softest. The tip region is the most flexible part with the smallest stiffness in the entire blade. In order to ensure that all cross sections of the blade that need to be solved can withstand a certain load and thus occur strain, thereby preparing for the final cross-sectional stiffness solving, the position corresponding to the tip section is selected for unidirectional static force loading.

[0042] The finite element model 1 of the target wind turbine blade is shown in Figure 2 The position corresponding to the tip section 3 can refer to a position close to the tip section.

[0043] Step 102, determining the strain value of each node in the target blade section in the finite element model.

[0044] The strain value is the strain value perpendicular to the direction of the blade section. As shown in Figure 2 The target blade section 2 is any section in the finite element model except the tip section.

[0045] In one embodiment, the strain value of each node in the target blade section can be obtained from the finite element software running the above finite element model.

[0046] It should be noted that determining the corresponding strain value after static force loading on the finite element model is prior art, which will not be described here.

[0047] In one embodiment, steps 102-107 can be performed on each blade section in the above finite element model except the tip section to obtain the bending stiffness of the blade section.

[0048] Step 103, determining the neutral axis based on the strain value of each node.

[0049] It should be noted that the neutral axis is a line in the cross section of the blade whose length neither elongates nor shortens when the blade is subjected to pure bending deformation. More directly, it is the connecting line of points with zero normal strain.

[0050] Therefore, the neutral axis of the target wind turbine blade can be determined according to the strain value of each node.

[0051] In some embodiments of the present application, step 103 can specifically include the following steps:

[0052] selecting a node with a strain value of 0 from the plurality of nodes to obtain at least one target node;

[0053] connecting the at least one target node to obtain a neutral axis.

[0054] In one embodiment, after the respective strain values of the plurality of nodes in the target blade section are accurately calculated by using the finite element model, a node with a strain value of 0 is selected from the plurality of nodes to obtain at least one target node, and all the target nodes are connected to obtain the neutral axis.

[0055] In the embodiments of the present application, the position of the neutral axis is no longer determined based on theoretical assumptions, but is "drawn" based on the real strain field calculated by the finite element method. Therefore, for a wind turbine blade made of composite materials and having an asymmetric cross section, the accuracy is much higher than that of theoretical estimation.

[0056] Step 104: determining a first distance between each node in the plurality of nodes and the neutral axis.

[0057] In one embodiment, the node positions of the plurality of nodes can be pre-set according to actual requirements.

[0058] Step 105: determining a bending moment of the target section based on the preset output value.

[0059] In some embodiments of the present application, step 105 can specifically include the following steps:

[0060] calculating a second distance between the preset output value and the target blade section, and calculating a product of the second distance and the preset output value to obtain the bending moment.

[0061] In one embodiment, the second distance is the force arm, and the bending moment can be calculated by the following formula:

[0062] M = F x L

[0063] wherein M is the bending moment, F is the preset output value, and L is the second distance.

[0064] Step 106: for each node, determining a bending stiffness of the node based on the bending moment, the first distance corresponding to the node, and the strain value corresponding to the node.

[0065] In some embodiments of the present application, step 106 can specifically include the following steps:

[0066] calculating a product of the bending moment and the first distance to obtain an intermediate parameter;

[0067] The proportion of the intermediate parameter in the strain value is calculated to obtain the bending stiffness of the node.

[0068] In one embodiment, the bending stiffness of each node can be calculated by the following formula:

[0069] EI i = Mh i / ε i

[0070] wherein, EI i is the bending stiffness of the i th node, M is the bending moment, h i is the first distance between the i th node and the neutral axis, ε i is the strain value of the i th node.

[0071] Step 107, determining the sectional bending stiffness of the target blade section based on the bending stiffness of each node.

[0072] In some embodiments of the present application, step 107 can specifically include the following steps:

[0073] The bending stiffnesses of the plurality of nodes are averaged to obtain the sectional bending stiffness of the target blade section.

[0074] In the embodiments of the present application, by averaging the bending stiffnesses of the plurality of nodes, the sectional bending stiffness of the target blade section is obtained, which can smooth out the possible small errors in the strain readings of individual nodes. In addition, since the strain values of the plurality of nodes on the target blade section are utilized in the process of calculating the sectional bending stiffness of the target blade section, the comprehensive performance of the entire blade section is fully reflected, and the accuracy of determining the sectional bending stiffness is improved.

[0075] According to the method for determining the bending stiffness of a wind turbine blade cross section provided by the embodiment of the present disclosure, a unidirectional static load is applied to a position corresponding to a tip cross section of a finite element model of a target wind turbine blade according to a preset output value; the strain values of each of a plurality of nodes in a target blade cross section in the finite element model are determined; the strain values are strain values perpendicular to the direction of the blade cross section; a neutral axis is determined based on the strain values of each of the plurality of nodes; the first distance between each of the plurality of nodes and the neutral axis is determined; the bending moment of the target cross section is determined based on the preset output value; for each node, the bending stiffness of the node is determined based on the bending moment, the first distance corresponding to the node, and the strain value corresponding to the node; and the cross section bending stiffness of the target blade cross section is determined based on the bending stiffness of each node. The neutral axis is determined by the strain values of different nodes obtained by applying a unidirectional static load to the finite element model of the target wind turbine blade, and then the cross section bending stiffness is inversely calculated based on the distance between different nodes on the target blade cross section and the neutral axis. Since the position of the neutral axis is obtained by accurately simulating the stress process of the wind turbine blade by using the finite element model, the cross section bending stiffness can be accurately calculated based on the neutral axis, thereby effectively improving the accuracy of the calculation of the wind turbine blade cross section.

[0076] Figure 3 is a device block diagram for determining the bending stiffness of a wind turbine blade cross section according to an exemplary embodiment. Referring to Figure 3 The device includes a loading unit 301, a first determination unit 302, a second determination unit 303, a third determination unit 304, a fourth determination unit 305, a fifth determination unit 306, and a sixth determination unit 307.

[0077] The loading unit 301 is configured to apply a unidirectional static load to a position corresponding to a tip cross section of a finite element model of a target wind turbine blade according to a preset output value.

[0078] The first determination unit 302 is configured to determine the strain values of each of a plurality of nodes in a target blade cross section in the finite element model; the strain values are strain values perpendicular to the direction of the blade cross section; and the target blade cross section is any cross section in the finite element model except the tip cross section.

[0079] The second determination unit 303 is configured to determine a neutral axis based on the strain values of each of the plurality of nodes.

[0080] The third determination unit 304 is configured to determine the first distance between each of the plurality of nodes and the neutral axis.

[0081] The fourth determination unit 305 is configured to determine the bending moment of the target cross section based on the preset output value.

[0082] The fifth determination unit 306 is configured to determine, for each node, a bending stiffness of the node based on the bending moment, a first distance corresponding to the node, and a strain value corresponding to the node.

[0083] The sixth determination unit 307 is configured to determine a section bending stiffness of the target blade section based on the bending stiffness of each node.

[0084] In some embodiments of the present application, the second determination unit 303 can be specifically configured to:

[0085] select a node with a strain value of 0 from the plurality of nodes to obtain at least one target node;

[0086] connect the at least one target node to obtain the neutral axis.

[0087] In some embodiments of the present application, the fourth determination unit 305 can be specifically configured to: calculate a second distance between the preset output value and the target blade section, and calculate a product of the second distance and the preset output value to obtain the bending moment.

[0088] In some embodiments of the present application, the fifth determination unit 306 can be configured to:

[0089] calculate a product of the bending moment and the first distance to obtain an intermediate parameter;

[0090] calculate a proportion of the intermediate parameter in the strain value to obtain the bending stiffness of the node.

[0091] In some embodiments of the present application, the sixth determination unit 307 can be specifically configured to: average the bending stiffness of the plurality of nodes to obtain the section bending stiffness of the target blade section.

[0092] As to the apparatus in the above-mentioned embodiments, the specific manners in which various modules perform operations have been described in details in the embodiments of the method, and will not be described in details here.

[0093] According to the determination device for the bending stiffness of the wind turbine blade section provided by the embodiment of the present disclosure, the position corresponding to the tip section of the target wind turbine blade in the finite element model is loaded in one direction according to the preset output value; the strain values of each node in the target blade section in the finite element model are determined; the strain value is the strain value perpendicular to the blade section direction; the neutral axis is determined based on the strain values of each node; the first distance between each node in the plurality of nodes and the neutral axis is determined; the bending moment of the target section is determined based on the preset output value; for each node, the bending stiffness of the node is determined based on the bending moment, the first distance corresponding to the node and the strain value corresponding to the node; and the section bending stiffness of the target blade section is determined based on the bending stiffness of each node. The strain values of different nodes obtained by loading the finite element model of the target wind turbine blade in one direction are used to determine the neutral axis, and then the bending stiffness of the section is inversely calculated based on the distance between different nodes on the target blade section and the neutral axis. Since the position of the neutral axis is obtained by accurately simulating the stress process of the wind turbine blade by using the finite element model, the bending stiffness of the section can be accurately calculated based on the neutral axis, and the accuracy of the calculation of the wind turbine blade section is effectively improved.

[0094] Figure 4 is a block diagram of a device for a method for determining the bending stiffness of a wind turbine blade section according to an example embodiment. For example, the device 400 can be an electronic device, such as a mobile phone, a computer, a digital broadcast terminal, a messaging device, a game console, a tablet device, a medical device, a fitness device, a personal digital assistant, and the like.

[0095] Referring to Figure 4 , the device 400 can include one or more of the following components: a processing component 402, a memory 404, a power supply 406, a multimedia component 408, an audio component 410, an input / output (I / O) interface 412, a sensor component 414, and a communication component 416.

[0096] The processing component 402 usually controls the overall operation of the device 400, such as operations associated with displaying, making phone calls, data communications, camera operations and recording operations. The processing component 402 can include one or more processors 420 to execute instructions to complete all or part of the steps of the methods described above. In addition, the processing component 402 can include one or more modules to facilitate interaction between the processing component 402 and other components. For example, the processing component 402 can include a multimedia module to facilitate the interaction between the multimedia component 408 and the processing component 402.

[0097] The memory 404 is configured to store various types of data to support the operation of the device 400. Examples of such data include instructions for any application or method operating on the device 400, contact data, phonebook data, messages, pictures, videos, and the like. The memory 404 can be implemented by any type of volatile or nonvolatile storage devices or a combination thereof such as static random access memory (SRAM), electrically erasable programmable read only memory (EEPROM), erasable programmable read only memory (EPROM), programmable read only memory (PROM), read only memory (ROM), magnetic memory, flash memory, magnetic disk or optical disk.

[0098] The power component 406 provides power to the various components of the device 400. The power component 406 can include a power management system, one or more power supplies, and other components associated with generating, managing, and distributing power for the device 400.

[0099] The multimedia component 408 includes a screen providing an output interface between the device 400 and a user. In some embodiments, the screen can include a liquid crystal display (LCD) and a touch panel (TP). If the screen includes a touch panel, the screen can be implemented as a touch screen to receive input signals from a user. The touch panel includes one or more touch sensors to sense touch, swiping, and gestures on the touch panel. The touch sensors can not only sense a boundary of a touching or swiping action, but also detect duration and pressure related to the touching or swiping action. In some embodiments, the multimedia component 408 includes a front camera and / or a rear camera. The front and / or rear camera can receive external multimedia data when the device 400 is in an operation mode, such as a shooting mode or a video mode. Each of the front and rear camera can be a fixed optical lens system or have a focal length and optical zoom capability.

[0100] The audio component 410 is configured to output and / or input audio signals. For example, the audio component 410 includes a microphone (MIC) configured to receive external audio signals when the device 400 is in an operation mode, such as a call mode, a recording mode, and a voice recognition mode. The received audio signals can be further stored in the memory 404 or transmitted via the communication component 416. In some embodiments, the audio component 410 also includes a speaker for outputting audio signals.

[0101] The I / O interface 412 provides an interface between the processing component 402 and peripheral interface modules, which can be a keyboard, a click wheel, a button, and the like. The buttons can include, but are not limited to, a home button, a volume button, a start button, and a lock button.

[0102] The sensor component 414 includes one or more sensors for providing status assessments for various aspects of the device 400. For example, the sensor component 414 can detect an open / closed position of the device 400, relative positioning of components, such as a display and keypad of the device 400, a change in position of the device 400 or a component of the device 400, presence or absence of user contact with the device 400, orientation or acceleration / deceleration of the device 400, and temperature changes of the device 400. The sensor component 414 can include proximity sensor(s) configured to detect presence of nearby objects without any physical contact. The sensor component 414 can also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, the sensor component 414 can also include an acceleration sensor, a gyroscope sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.

[0103] The communication component 416 is configured to facilitate wired or wireless communication between the device 400 and another device. The device 400 can access a wireless network based on a communication standard, such as WiFi, 2G, or 3G, or a combination thereof. In an exemplary embodiment, the communication component 416 receives a broadcast signal or broadcast related information from an external broadcast management system via a broadcast channel. In an exemplary embodiment, the communication component 416 further includes a Near Field Communication (NFC) module to facilitate short-range communication. For example, the NFC module can be implemented based on Radio Frequency Identification (RFID) technology, infrared data association (IrDA) technology, ultra-wideband (UWB) technology, Bluetooth (BT) technology and other technology.

[0104] In an exemplary embodiment, the device 400 can be implemented using one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), controllers, micro-controllers, microprocessors, or other electronic modules to perform the above-described methods.

[0105] In an exemplary embodiment, a non-transitory computer-readable storage medium, such as the memory 404 including instructions stored therein, is also provided. The instructions may, for example, be executable by the processor 420 of the device 400 to perform the above-described methods. The non-transitory computer-readable storage medium may, for example, be a ROM, a random access memory (RAM), a CD-ROM, a magnetic tape, a floppy disc, and an optical data storage device, and the like.

[0106] In an exemplary embodiment, a computer program product including a computer program is also provided. The computer program may, for example, be executed by the processor 420 of the device 400 to implement the above-described methods.

[0107] Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. It is intended that the specification and examples be considered as exemplary only, with the true scope and spirit of the application being indicated by the following claims.

[0108] It is to be understood that the application is not limited to the precise construction hereinafter described and as shown in the attached drawings, and that various modifications and changes can be made by those skilled in the art without departing from the scope of the application. The scope of the application is limited only by the claims that follow.

Claims

1. A method for determining the bending stiffness of a wind turbine blade cross section, characterized in that, include: A unidirectional static load is applied to the position corresponding to the blade tip section in the finite element model of the target wind turbine blade according to the preset output force value; Determine the strain values ​​of each node in the target blade section of the finite element model; The strain value is the strain value perpendicular to the direction of the blade cross section; The target blade cross section is any cross section in the finite element model other than the blade tip cross section; The neutral axis is determined based on the strain values ​​of each of the multiple nodes; Determine a first distance between each of the plurality of nodes and the neutral axis; The bending moment of the target section is determined based on the preset output value; For each node, the bending stiffness of the node is determined based on the bending moment, the first distance corresponding to the node, and the strain value corresponding to the node. The cross-sectional bending stiffness of the target blade section is determined based on the bending stiffness of each node.

2. The method for determining the bending stiffness of a wind turbine blade section according to claim 1, characterized in that, The determination of the neutral axis based on the strain values ​​of the plurality of nodes includes: Select a node with a strain value of 0 from the plurality of nodes to obtain at least one target node; The neutral axis is obtained by connecting the at least one target node.

3. The method for determining the bending stiffness of a wind turbine blade section according to claim 1, characterized in that, The step of determining the bending moment of the target section based on the preset output value includes: Calculate the second distance between the preset output value and the target blade cross section, and calculate the product of the second distance and the preset output value to obtain the bending moment.

4. The method for determining the bending stiffness of a wind turbine blade section according to claim 1, characterized in that, Determining the bending stiffness of the node based on the bending moment, the first distance corresponding to the node, and the strain value corresponding to the node includes: Calculate the product of the bending moment and the first distance to obtain intermediate parameters; The bending stiffness of the node is obtained by calculating the proportion of the intermediate parameter in the strain value.

5. The method for determining the bending stiffness of a wind turbine blade section according to claim 1, characterized in that, The determination of the section bending stiffness of the target blade cross section based on the bending stiffness of each node includes: The bending stiffness of the target blade section is obtained by averaging the bending stiffness of the multiple nodes.

6. A device for determining the bending stiffness of a wind turbine blade cross section, characterized in that, include: The loading unit is used to apply unidirectional static load to the position corresponding to the tip section in the finite element model of the target wind turbine blade according to the preset output force value; The first determining unit is used to determine the strain values ​​of multiple nodes in the target blade section of the finite element model. The strain value is the strain value perpendicular to the direction of the blade cross section; The target blade cross section is any cross section in the finite element model other than the blade tip cross section; The second determining unit is used to determine the neutral axis based on the strain values ​​of the plurality of nodes; The third determining unit is used to determine a first distance between each of the plurality of nodes and the neutral axis; The fourth determining unit is used to determine the bending moment of the target section based on the preset output force value; The fifth determining unit is used to determine the bending stiffness of each node based on the bending moment, the first distance corresponding to the node, and the strain value corresponding to the node. The sixth determining unit is used to determine the cross-sectional bending stiffness of the target blade section based on the bending stiffness of each node.

7. The device for determining the bending stiffness of a wind turbine blade section according to claim 6, characterized in that, The second determining unit is specifically used for: Select a node with a strain value of 0 from the plurality of nodes to obtain at least one target node; The neutral axis is obtained by connecting the at least one target node.

8. An electronic device, characterized in that, include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor, when executing the computer program, implements the method as described in any one of claims 1 to 5.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the method as described in any one of claims 1 to 5.

10. A computer program product, comprising a computer program, characterized in that, The computer program, when executed by a processor, implements the method as described in any one of claims 1 to 5.

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