Wind power blade biaxial fatigue loading system
Patent Information
- Application Number
- CN202421939476.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-09
- Publication Date
- 2025-06-27
- Estimated Expiration
- 2034-08-09
AI Technical Summary
The existing wind power blade fatigue testing technology is difficult to meet the load and reliability testing requirements of high-power blades. The single-axis loading method has a long test cycle and low accuracy, and the dual-axis motor resonance loading system has load distribution influence and limitations.
A biaxial fatigue loading system for wind power blades is designed. By setting the first and second loading modules outside the blade to be tested, and applying fatigue loads in the waving direction and the swing vibration direction respectively, biaxial loading is achieved and testing accuracy is improved.
This system achieves efficient biaxial fatigue loading without affecting the blade load distribution, significantly improving the fatigue testing accuracy and efficiency of wind power blades.
Smart Images
Figure CN223037653U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of wind power equipment testing, and particularly relates to a biaxial fatigue loading system for wind turbine blades. Background Art
[0002] As a key component in a wind turbine that converts wind energy into mechanical energy, the performance of a wind turbine blade directly affects the operation reliability and power generation efficiency of the wind turbine. However, due to the harsh working environment, the blade is easily subjected to the coupled action of random wind loads and inertial loads for a long time and is prone to fatigue failure. Blade fracture caused by fatigue has become the main form of wind turbine blade failure. To ensure the structural reliability of the blade, the wind turbine blade must be subjected to full-scale structural fatigue testing in accordance with relevant standards before being put on the market to check whether the blade meets the fatigue life specified in the design.
[0003] Currently, blade fatigue testing mainly uses a uniaxial loading method to conduct full-scale structural fatigue testing on wind turbine blades. The blade is excited by the inertial force generated by driving an eccentric mass to rotate with a motor, so that the blade enters the resonance state and vibrates reciprocally in the flap direction or the pitch direction to generate a test load. However, with the continuous increase in the power of wind turbines, the corresponding loads and sizes of wind turbine blades also increase synchronously. The inertial force load generated by driving an eccentric mass to rotate with a motor can no longer meet the test requirements for blade verification loads and reliability, which is mainly reflected in the following aspects:
[0004] First, with the increase in the blade test load in the motor eccentric excitation method, the corresponding requirements for the motor power and the eccentric excitation mass increase, which causes the counterweight at the loading point to exceed the standard, bringing great difficulties to the design of the test plan; in addition, higher requirements are put forward for the centrifugal load of the motor, and it is difficult to ensure the stable and reliable operation of the motor.
[0005] Second, the uniaxial fatigue loading test only applies fatigue loads to the blade in one direction each time for testing, and the test cycle is too long. Especially for large blades over 100 meters, due to their low first-order frequency, the fatigue test cycle is basically more than half a year or even longer.
[0006] Third, the uniaxial fatigue loading test cannot effectively characterize the alternating loads received by the blade under actual operating conditions, and thus cannot comprehensively evaluate the actual fatigue condition of the blade, and the fatigue test accuracy is relatively low.
[0007] Currently, there is also a method of fatigue testing wind turbine blades through a biaxial motor resonance loading system. The biaxial motor resonance loading system uses eccentric mass rotation resonance excitation on the blade loading section. However, this method requires fixing the eccentric motor system on the wind turbine blade for testing, which causes a certain impact on the load distribution of the blade due to the additional mass load of the eccentric motor system. As the excitation load required for large blades increases and the power of the motor system becomes higher, the additional mass load of the motor system has exceeded the bearing requirements of the blade, resulting in great limitations. Summary of the Invention
[0008] The embodiment of the present application provides a biaxial fatigue loading system for wind turbine blades. A first loading module and a second loading module are arranged outside the specified test positions corresponding to the wind turbine blades to be tested. The first loading module and the second loading module respectively apply fatigue loads to the wind turbine blades to be tested in different directions, so as to improve the fatigue test accuracy of the wind turbine blades to be tested.
[0009] The biaxial fatigue loading system for wind turbine blades includes: a test bench for fixing the wind turbine blade to be tested at the specified test position; a first loading module arranged outside the specified test position for connecting the wind turbine blade to be tested and applying a first fatigue load to the wind turbine blade to be tested in a first direction when the wind turbine blade to be tested is fixed on the test bench; a second loading module arranged outside the specified test position for connecting the wind turbine blade to be tested and applying a second fatigue load to the wind turbine blade to be tested in a second direction when the wind turbine blade to be tested is fixed on the test bench, and the second direction is different from the first direction.
[0010] In some embodiments, one of the first direction and the second direction is the flapping direction of the wind turbine blade to be tested, and the other is the pitching direction of the wind turbine blade to be tested. The flapping direction is perpendicular to the rotation plane corresponding to the wind turbine blade to be tested, and the pitching direction is located within the rotation plane.
[0011] In some embodiments, the first loading module includes a first traction sub-module and a first traction rope; the first loading module connects the wind turbine blade to be tested through one end of the first traction rope, and the other end of the first traction rope is connected to the first traction sub-module; the first traction sub-module is fixed on the first anchor point for applying the first fatigue load to the wind turbine blade to be tested through the first traction rope.
[0012] In some embodiments, the first anchoring point is disposed directly below the wind turbine blade to be tested. The first loading module further includes a track, and the first traction sub-module is slidably connected to the track. When the first traction rope is connected to different positions of the wind turbine blade to be tested, the first traction sub-module is at different positions in the track and fixed to different first anchoring points.
[0013] In some embodiments, the first loading module further includes a first fixture, which is disposed on the wind turbine blade to be tested. The first loading module is connected to the first fixture through one end of the first traction rope to connect the wind turbine blade to be tested.
[0014] In some embodiments, the second loading module includes a second traction sub-module and a second traction rope; the second loading module is connected to the wind turbine blade to be tested through one end of the second traction rope, and the other end of the second traction rope is connected to the second traction sub-module; the second traction sub-module is fixed to the second anchoring point and is used to apply the second fatigue load to the wind turbine blade to be tested through the second traction rope.
[0015] In some embodiments, the second anchoring point is disposed obliquely below the wind turbine blade to be tested. The second loading module further includes a bracket, which is used to provide a fulcrum for the second traction rope, so that the second traction rope is connected to the wind turbine blade from one side and then turns to be vertically downward to connect the second traction sub-module.
[0016] In some embodiments, the second loading module further includes a second fixture, which is disposed on the wind turbine blade to be tested. The second loading module is connected to the second fixture through one end of the second traction rope to connect the wind turbine blade to be tested.
[0017] In some embodiments, it further includes: a control module, connected to the first loading module and the second loading module, and used to control the first fatigue load and the second fatigue load.
[0018] In some embodiments, the test bench includes an adapter flange, and the test bench fixes the wind turbine blade to be tested at the specified test position through the adapter flange.
[0019] By applying the above technical solution, the biaxial fatigue loading system for wind turbine blades includes: a test bench for fixing the wind turbine blade to be tested at a specified test position; a first loading module arranged outside the specified test position for connecting the wind turbine blade to be tested and applying a first fatigue load to the wind turbine blade to be tested in a first direction when the wind turbine blade to be tested is fixed to the test bench; and a second loading module arranged outside the specified test position for connecting the wind turbine blade to be tested and applying a second fatigue load to the wind turbine blade to be tested in a second direction when the wind turbine blade to be tested is fixed to the test bench, the second direction being different from the first direction. Thus, on the basis of not affecting the load distribution of the wind turbine blade to be tested, efficient biaxial fatigue loading of the wind turbine blade to be tested is achieved, and the fatigue test accuracy of the wind turbine blade to be tested is improved. Description of the Drawings
[0020] In order to more clearly illustrate the technical solutions of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments recorded in the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.
[0021] Figure 1 Structural schematic of the biaxial fatigue loading system for wind turbine blades according to the embodiment of the present application Figure 1 ;
[0022] Figure 2 Structural schematic of the biaxial fatigue loading system for wind turbine blades according to the embodiment of the present application Figure 2 。
[0023] Figure 1 and Figure 2 In FIGS. and, 1, test bench; 11, adapter flange; 2, first loading module; 21, first traction sub-module; 22, first traction rope; 23, track; 24, first fixture; 3, second loading module; 31, second traction sub-module; 32, second traction rope; 33, bracket; 34, second fixture; 4, wind turbine blade to be tested; 5, control module. Detailed Embodiments
[0024] Reference is made herein to the various solutions and features of the present application with reference to the drawings.
[0025] It should be understood that various modifications can be made to the embodiments applied herein. Therefore, the above specification should not be regarded as a limitation, but only as an example of the embodiments. Those skilled in the art will think of other modifications within the scope and spirit of the present application.
[0026] The accompanying drawings, which are included in and form a part of this specification, illustrate embodiments of the present application and, together with the general description of the present application given above and the detailed description of the embodiments given below, serve to explain the principles of the present application.
[0027] These and other features of the present application will become apparent from the following description of the preferred forms of the embodiments given by way of non-limiting example with reference to the accompanying drawings.
[0028] It should also be understood that although the present application has been described with reference to some specific examples, those skilled in the art can surely implement many other equivalent forms of the present application.
[0029] The above and other aspects, features, and advantages of the present application will become more apparent in view of the following detailed description when taken in conjunction with the accompanying drawings.
[0030] Specific embodiments of the present application will be described hereinafter with reference to the accompanying drawings; however, it should be understood that the embodiments claimed are merely examples of the present application and can be implemented in various ways. Well-known and / or repetitive functions and structures are not described in detail to avoid obscuring the present application with unnecessary or redundant details. Therefore, the specific structural and functional details claimed herein are not intended to be limiting, but rather are merely a basis and representative basis for the claims to teach those skilled in the art to use the present application in substantially any suitable detailed structure in a variety of ways.
[0031] This specification may use the phrases "in one embodiment", "in another embodiment", "in yet another embodiment", or "in other embodiments", each of which may refer to one or more of the same or different embodiments according to the present application.
[0032] A biaxial fatigue loading system for a wind turbine blade according to an embodiment of the present application is provided with a first loading module and a second loading module outside a specified test position corresponding to the wind turbine blade to be tested. The first loading module and the second loading module respectively apply fatigue loads to the wind turbine blade to be tested in different directions, so as to achieve efficient biaxial fatigue loading of the wind turbine blade to be tested without affecting the load distribution of the wind turbine blade to be tested, and improve the fatigue test accuracy of the wind turbine blade to be tested.
[0033] As Figure 1 shown, the system includes:
[0034] A test bench 1 for fixing the wind turbine blade 4 to be tested at a specified test position;
[0035] A first loading module 2, arranged outside the specified test position, for connecting the wind turbine blade 4 to be tested and applying a first fatigue load to the wind turbine blade 4 to be tested in a first direction when the wind turbine blade 4 to be tested is fixed on the test bench 1;
[0036] The second loading module 3 is arranged outside the specified test position and is used to connect the wind power blade 4 to be tested and apply a second fatigue load to the wind power blade 4 to be tested in a second direction different from the first direction when the wind power blade 4 to be tested is fixed to the test bench 1.
[0037] In this embodiment, the biaxial fatigue loading means applying fatigue loading to the wind power blade 4 to be tested in two different directions. The test bench 1 fixes one end of the wind power blade 4 to be tested, so that the wind power blade 4 to be tested is fixed at the specified test position. When testing the wind power blade 4 to be tested, first fix the wind power blade 4 to be tested on the test bench 1, then connect the first loading module 2 and the second loading module 3 to the wind power blade 4 to be tested, and then apply a first fatigue load to the wind power blade 4 to be tested in the first direction through the first loading module 2, and apply a second fatigue load to the wind power blade 4 to be tested in a second direction different from the first direction through the second loading module 3. Under the action of the first fatigue load and the second fatigue load, the wind power blade 4 to be tested generates excitation corresponding to the first direction and the second direction. Finally, by collecting the strain parameters on the wind power blade 4 to be tested, the biaxial fatigue loading of the wind power blade 4 to be tested is completed.
[0038] Among them, the first fatigue load and the second fatigue are synchronously loaded onto the wind power blade 4 to be tested in a specified form. The specified form can, for example, change according to a sine curve, etc. In some embodiments of the present application, by applying the first fatigue load and the second fatigue to the wind power blade 4 to be tested, the wind power blade 4 to be tested reciprocates at its natural frequency in the flap direction, and at the same time, the wind power blade 4 to be tested reciprocates at its natural frequency in the lead-lag direction.
[0039] Optionally, according to different test requirements, the first loading module 2 and the second loading module 3 can be connected to different positions of the wind power blade 4 to be tested, or both can be connected to the same position on the wind power blade 4 to be tested.
[0040] In some embodiments of the present application, one of the first direction and the second direction is the flap direction of the wind power blade 4 to be tested, and the other is the lead-lag direction of the wind power blade 4 to be tested. The flap direction is perpendicular to the corresponding rotation plane of the wind power blade 4 to be tested, and the lead-lag direction is located within the rotation plane.
[0041] In this embodiment, the fatigue test of the wind power blade 4 to be tested is carried out through the flap direction and the lead-lag direction of the wind power blade 4 to be tested. When fixing the wind power blade 4 to be tested on the test bench 1, the wind power blade 4 to be tested can be fixed in a horizontal cross-section or a vertical cross-section. Among them, the horizontal cross-section corresponds to making the rotation plane of the wind power blade 4 to be tested parallel to the ground, and the vertical cross-section corresponds to making the rotation plane of the wind power blade 4 to be tested perpendicular to the ground.
[0042] If the wind power blade 4 to be tested is horizontally fixed to the test bench 1 according to the cross-section, as Figure 2 shown, the first direction is the flapping direction, the second direction is the pitching direction, the first loading module 2 is used to apply a first fatigue load to the wind power blade 4 to be tested in the flapping direction, and the second loading module 3 is used to apply a second fatigue load to the wind power blade 4 to be tested in the pitching direction.
[0043] If the wind power blade 4 to be tested is vertically fixed to the test bench 1 according to the cross-section, the first direction is the pitching direction, the second direction is the flapping direction, the first loading module 2 is used to apply a first fatigue load to the wind power blade 4 to be tested in the pitching direction, and the second loading module 3 is used to apply a second fatigue load to the wind power blade 4 to be tested in the flapping direction.
[0044] In some embodiments of the present application, the first loading module 2 includes a first traction sub-module 21 and a first traction rope 22;
[0045] One end of the first traction rope 22 of the first loading module 2 is connected to the wind power blade 4 to be tested, and the other end of the first traction rope 22 is connected to the first traction sub-module 21;
[0046] The first traction sub-module 21 is fixed to the first anchor point and is used to apply a first fatigue load to the wind power blade 4 to be tested through the first traction rope 22.
[0047] In this embodiment, the first traction sub-module 21 is fixed to the first anchor point. The first anchor point can be set on the ground. The first traction sub-module 21 applies a first fatigue load to the wind power blade 4 to be tested by pulling the first traction rope 22, thereby realizing reliable loading of the first fatigue load.
[0048] Optionally, the first traction sub-module 21 can be a device that can generate traction force such as a DC motor or an AC motor, and the first traction rope 22 can be made of any one of synthetic fibers, steel wires, high molecular polyethylene fibers, etc.
[0049] In some embodiments of the present application, the first anchor point is set directly below the wind power blade 4 to be tested. The first loading module 2 further includes a track 23. The first traction sub-module 21 is slidably connected to the track 23. When the first traction rope 22 is connected to different positions of the wind power blade 4 to be tested, the first traction sub-module 21 is in different positions in the track 23 and is fixed to different first anchor points.
[0050] In this embodiment, the first anchoring point is arranged directly below the wind turbine blade 4 to be measured, so that the first traction sub-module 21 can vertically downwardly traction the first traction rope 22, thereby applying a first fatigue load to the wind turbine blade 4 to be measured without affecting the load distribution of the wind turbine blade 4 to be measured. A plurality of first anchoring points can be arranged along the blade to be measured, and a track 23 is arranged. When it is necessary to change the connection position with the wind turbine blade 4 to be measured, the first traction sub-module 21 is moved along the track 23 to the corresponding position and re-fixed at the corresponding first anchoring point, so that the first traction sub-module 21 can more efficiently apply the first fatigue load to different positions of the wind turbine blade 4 to be measured.
[0051] In some embodiments of the present application, the first loading module 2 further includes a first fixture 24. The first fixture 24 is arranged on the wind turbine blade 4 to be measured. The first loading module 2 is connected to the first fixture 24 through one end of the first traction rope 22 to realize the connection with the wind turbine blade 4 to be measured.
[0052] In this embodiment, by setting the first fixture 24, the first loading module 2 can be reliably connected to the wind turbine blade 4 to be measured, thereby improving the fatigue test accuracy.
[0053] In some embodiments of the present application, the second loading module 3 includes a second traction sub-module 31 and a second traction rope 32;
[0054] One end of the second traction rope 32 of the second loading module 3 is connected to the wind turbine blade 4 to be measured, and the other end of the second traction rope 32 is connected to the second traction sub-module 31;
[0055] The second traction sub-module 31 is fixed on the second anchoring point and is used to apply a second fatigue load to the wind turbine blade 4 to be measured through the second traction rope 32.
[0056] In this embodiment, the second traction sub-module 31 is fixed on the second anchoring point. The second anchoring point can be arranged on the ground. The second traction sub-module 31 applies a second fatigue load to the wind turbine blade 4 to be measured by traction the second traction rope 32, thereby realizing reliable loading of the second fatigue load.
[0057] Optionally, the second traction sub-module 31 can be a device that can generate traction force such as a DC motor or an AC motor, and the second traction rope 32 can be made of any one of materials such as synthetic fiber, steel wire, and high molecular polyethylene fiber.
[0058] In some embodiments of the present application, the second anchoring point is arranged at the lower side of the wind turbine blade 4 to be measured. The second loading module 3 further includes a bracket 33. The bracket 33 is used to provide a fulcrum for the second traction rope 32, so that the second traction rope 32 is connected to the wind turbine blade 4 to be measured from one side and then turns to be vertically downwardly connected to the second traction sub-module 31.
[0059] In this embodiment, the second anchoring point is arranged below the side of the wind turbine blade 4 to be tested. Through the second anchoring point, the second traction sub-module 31 can be fixed below the side of the wind turbine blade 4 to be tested. The bracket 33 can provide a fulcrum for the second traction rope 32, so that the second traction rope 32 is connected to the wind turbine blade 4 to be tested from one side and then turns to be vertically downward to connect the second traction sub-module 31. When the second traction sub-module 31 vertically pulls the second traction rope 32 downward, a second fatigue load is applied to the wind turbine blade 4 to be tested, so that on the basis of not affecting the load distribution of the wind turbine blade 4 to be tested, the second fatigue load can be more reliably applied to the wind turbine blade 4 to be tested.
[0060] It should be noted that the area below the side of the wind turbine blade 4 to be tested means that when facing the non-fixed end of the wind turbine blade 4 to be tested, it is the area below the left side or the area below the right side of the wind turbine blade 4 to be tested.
[0061] In some embodiments of the present application, the second loading module 3 further includes a second fixture 34. The second fixture 34 is arranged on the wind turbine blade 4 to be tested. The second loading module 3 is connected to the second fixture 34 through one end of the second traction rope 32 to realize the connection to the wind turbine blade 4 to be tested.
[0062] In this embodiment, by setting the second fixture 34, the second loading module 3 can be reliably connected to the wind turbine blade 4 to be tested, thereby improving the fatigue test accuracy.
[0063] In some embodiments of the present application, the system further includes:
[0064] A control module 5, connected to the first loading module 2 and the second loading module 3, for controlling the first fatigue load and the second fatigue load.
[0065] In this embodiment, the control module 5 may include a main control module, a first sub-control module and a second sub-control module. The first sub-control module is used to control the first fatigue load by controlling the first loading module 2. The second sub-control module is used to control the second fatigue load by controlling the second loading module 3. The main control module is used to determine the target first fatigue load and the target second fatigue load in a suitable proportion according to the strain parameters of the wind turbine blade 4 to be tested, and send them to the first sub-control module and the second sub-control module respectively. Therefore, the automatic loading of the fatigue load can be realized through the control module 5, which improves the test efficiency and accuracy. At the same time, it can also avoid the situation that the load in a certain direction is too small or overloaded, which may seriously damage the blade.
[0066] In some embodiments of the present application, the system further includes:
[0067] A signal preprocessing module, connected to the control module 5, for collecting the strain parameters of the wind turbine blade 4 to be tested, preprocessing the strain parameters according to a specified preprocessing process, and then sending them to the control module 5. The strain parameters are generated after the wind turbine blade 4 to be tested is applied with the first fatigue load and the second fatigue load.
[0068] In this embodiment, the preprocessing process may include preprocessing such as filtering and signal amplification. By setting up a signal preprocessing module, the control module 5 can obtain more accurate strain parameters of the wind turbine blade 4 to be measured, thereby improving the fatigue test accuracy.
[0069] In some embodiments of the present application, the test bench 1 includes an adapter flange 11. The test bench 1 fixes the wind turbine blade 4 to be measured at a specified test position through the adapter flange 11.
[0070] In addition, although exemplary embodiments have been described herein, the scope includes any and all embodiments based on the present disclosure having equivalent elements, modifications, omissions, combinations (e.g., schemes that cross various embodiments), adaptations, or alterations. The elements in the claims will be broadly interpreted based on the language employed in the claims and are not limited to the examples described in this specification or during the implementation of the present application, and the examples will be interpreted as non-exclusive. Thus, this specification and the examples are intended to be considered only as examples, and the true scope and spirit are indicated by the full scope of the following claims and their equivalents.
[0071] The above description is intended to be illustrative rather than restrictive. For example, the above examples (or one or more of them) can be used in combination with each other. For example, those of ordinary skill in the art can use other embodiments when reading the above description. Additionally, in the above detailed description, various features can be grouped together to simplify the present disclosure. This should not be construed as an intention that a disclosed feature not claimed is necessary for any claim. On the contrary, the subject matter of the present disclosure may be less than all the features of a particular disclosed embodiment. Thus, the following claims are hereby incorporated into the detailed description as examples or embodiments, where each claim stands alone as a separate embodiment, and considering these embodiments, they can be combined with each other in various combinations or permutations. The scope of the present disclosure should be determined with reference to the appended claims and the full scope of the equivalents to which these claims are entitled.
[0072] The above has described multiple embodiments of the present disclosure in detail, but the present disclosure is not limited to these specific embodiments. Those skilled in the art can make various variations and modifications to the embodiments based on the concept of the present disclosure, and these variations and modifications should all fall within the scope required to be protected by the present disclosure.
Claims
1. A wind turbine blade biaxial fatigue loading system, characterized in that: include: The test bench is used to fix the wind turbine blade to be tested at a designated test position; A first loading module is arranged outside the designated test position, and is used to connect the wind turbine blade to be tested and apply a first fatigue load to the wind turbine blade to be tested in a first direction when the wind turbine blade to be tested is fixed to the test bench; The second loading module is arranged outside the designated test position, and is used to connect the wind turbine blade to be tested and apply a second fatigue load to the wind turbine blade to be tested in a second direction when the wind turbine blade to be tested is fixed on the test bench, and the second direction is different from the first direction.
2. The wind turbine blade biaxial fatigue loading system according to claim 1, characterized in that: One of the first direction and the second direction is a flapping direction of the wind turbine blade to be tested, and the other is a swinging direction of the wind turbine blade to be tested. The flapping direction is perpendicular to a rotation plane corresponding to the wind turbine blade to be tested, and the swinging direction is located in the rotation plane.
3. The wind turbine blade biaxial fatigue loading system according to claim 2, characterized in that: The first loading module includes a first traction submodule and a first traction rope; The first loading module is connected to the wind turbine blade to be tested via one end of the first traction rope, and the other end of the first traction rope is connected to the first traction submodule; The first traction submodule is fixed on a first anchor point, and is used to apply the first fatigue load to the wind turbine blade to be tested through the first traction rope.
4. The wind turbine blade biaxial fatigue loading system according to claim 3, characterized in that: The first anchoring point is arranged directly below the wind turbine blade to be tested, the first loading module also includes a track, the first traction submodule is slidably connected to the track, and when the first traction rope is connected to different positions of the wind turbine blade to be tested, the first traction submodule is at different positions in the track and is fixed at different first anchoring points.
5. The wind turbine blade biaxial fatigue loading system according to claim 3, characterized in that: The first loading module further includes a first clamp, which is disposed on the wind turbine blade to be tested. The first loading module is connected to the first clamp via one end of the first traction rope to achieve connection with the wind turbine blade to be tested.
6. The wind turbine blade biaxial fatigue loading system according to claim 2, characterized in that: The second loading module includes a second traction submodule and a second traction rope; The second loading module is connected to the wind turbine blade to be tested via one end of the second traction rope, and the other end of the second traction rope is connected to the second traction submodule; The second traction submodule is fixed on a second anchor point, and is used to apply the second fatigue load to the wind turbine blade to be tested through the second traction rope.
7. The wind turbine blade biaxial fatigue loading system according to claim 6, characterized in that: The second anchor point is arranged at the lower side of the wind turbine blade to be tested, and the second loading module also includes a bracket, which is used to provide a fulcrum for the second traction rope, so that the second traction rope is connected to the wind turbine blade to be tested from one side and then turns to connect vertically downward to the second traction sub-module.
8. The wind turbine blade biaxial fatigue loading system according to claim 6, characterized in that: The second loading module further includes a second clamp, which is disposed on the wind turbine blade to be tested. The second loading module is connected to the second clamp via one end of the second traction rope to achieve connection with the wind turbine blade to be tested.
9. The wind turbine blade biaxial fatigue loading system according to claim 1, characterized in that: Also includes: A control module is connected to the first loading module and the second loading module, and is used to control the first fatigue load and the second fatigue load.
10. The wind turbine blade biaxial fatigue loading system according to claim 1, characterized in that: The test bench comprises an adapter flange, and the test bench fixes the wind turbine blade to be tested at the designated test position via the adapter flange.