Torsion test system and torsion test method for fan blades

Abstract

The present disclosure provides a torsional test system and a torsional test method for a wind turbine blade. The torsional test system includes: a test bench for fixing the root portion of the wind turbine blade; a clamping portion for clamping the tip portion of the wind turbine blade; a load applying portion connected to at least one side of the clamping portion for applying a load to the wind turbine blade through the clamping portion to cause the wind turbine blade to twist; a detection assembly for obtaining torsional deformation data at multiple positions of the wind turbine blade; and a controller for calculating the torsional moment applied by the load applying portion to the wind turbine blade based on the applied load, and determining the torsional stiffness of the wind turbine blade according to the torsional moment and the torsional deformation data. By calculating the torsional stiffness of the wind turbine blade, it is possible to avoid aeroelastic problems and blade operation vibration problems of the wind turbine blade, and is beneficial to the design and development of large-sized wind turbine blades.

Description

Technical Field

[0001] The present disclosure relates to the technical field of fan testing, and more particularly, to a torsional testing system and a torsional testing method for a fan blade. Background Art

[0002] With the continuous increase in the size of fan blades, the flexible characteristics of fan blades have become more obvious. Torsion, as an inherent property of fan blades, has an increasing impact on the comprehensive performance of the blades. For example, torsion can cause aeroelastic problems and blade operation vibration problems.

[0003] However, when measuring the strain state in torsional testing, the amount of data obtained is limited, making it difficult to comprehensively test the blade surface data. In addition, the torsional deformation is much smaller than the bending deformation, and the existing methods for measuring torsional deformation have low accuracy, resulting in poor convergence of multiple measurement results.

[0004] Currently, the torsional testing simulation and related data support are very weak. For theoretical calculations and the current situation of related software calculations, it is difficult to obtain reliable and comprehensive torsional testing data as the simulation data correction standard, so it is difficult to obtain the accurate torsional stiffness of fan blades. Summary of the Invention

[0005] Therefore, an object of the present disclosure is to provide a torsional testing system and a torsional testing method for a fan blade that can obtain the accurate torsional stiffness of the fan blade.

[0006] Another object of the present disclosure is to provide a torsional testing system and a torsional testing method for a fan blade that can improve the rationality and reliability of blade design and development.

[0007] According to one aspect of the present disclosure, there is provided a torsional testing system for a fan blade, the torsional testing system including: a test bench for fixing the root of the fan blade; a clamping portion for clamping the tip of the fan blade; a load loading portion connected to at least one side of the clamping portion for applying a load that causes the fan blade to twist through the clamping portion; a detection assembly for obtaining torsional deformation data at multiple positions of the fan blade; and a controller for calculating the torsional moment applied to the fan blade by the load loading portion based on the loaded load, and determining the torsional stiffness of the fan blade according to the torsional moment and the torsional deformation data.

[0008] Preferably, the torsional testing system may further include a protractor mounted on the clamping portion for measuring the angular change of the clamping portion during the loading of the load, and the controller may calculate the torsional moment applied to the fan blade by the load loading portion based on the loaded load and the angle measured by the protractor.

[0009] Preferably, the detection component may include a plurality of detection lines disposed on the surface of the wind turbine blade. The plurality of detection lines extend along the chord direction of the wind turbine blade and are spaced apart along the span direction of the wind turbine blade. The plurality of detection lines are used to detect the torsional deformation degree of multiple cross-sections of the wind turbine blade.

[0010] Preferably, the detection component may further include a thermal imaging device. The detection line may be a resistance wire and is connected to a power source, capable of generating heat during the loading of the load, and the thermal imaging device is capable of capturing the thermal image of the resistance wire during the loading of the load.

[0011] Preferably, the detection component may further include a piezoelectric signal catcher. The detection line may be formed of a piezoelectric material, and the piezoelectric signal catcher is capable of obtaining a piezoelectric signal from the detection line during the loading of the load.

[0012] Preferably, the detection component may include a camera, and a plurality of spots may be provided on the surface of the wind turbine blade. The camera is capable of capturing a picture of the wind turbine blade during the loading of the load, and the controller is capable of determining the torsional deformation data of the wind turbine blade based on the captured picture.

[0013] Preferably, the clamping portion may include a fixture body and a loading arm extending outward from the fixture body. The angle gauge is disposed on the loading arm.

[0014] Preferably, the clamping portion may include a first fixture and a second fixture disposed opposite to each other. The first fixture and the second fixture clamp the wind turbine blade on the pressure side and the suction side of the wind turbine blade, respectively.

[0015] Preferably, the clamping portion may further include a connecting rod and a support rod. Two ends of the connecting rod are respectively connected to the first fixture and the second fixture, and one end of the support rod is connected to the connecting rod and the other end of the support rod is fixed.

[0016] Preferably, a conforming block matching the shapes of the pressure side and the suction side of the wind turbine blade may be disposed inside each of the first fixture and the second fixture.

[0017] According to another aspect of the present disclosure, a torsional test method for a wind turbine blade is provided. The torsional test method includes the following steps: fixing the root portion of the wind turbine blade to a test bench and clamping the tip portion of the wind turbine blade with a clamping portion to keep the wind turbine blade in a horizontal state; arranging detection components at multiple positions on the surface of the wind turbine blade and connecting the detection components to a controller; connecting a load application portion to at least one side of the clamping portion, and applying a load that causes the wind turbine blade to twist to the wind turbine blade through the clamping portion; the controller obtains the torsional deformation data of the wind turbine blade from the detection components, calculates the torsional moment applied to the wind turbine blade by the load application portion based on the applied load, and determines the torsional stiffness of the wind turbine blade according to the torsional moment and the torsional deformation data.

[0018] Preferably, the step of arranging the detection components may include: installing an angle gauge on the clamping portion, where the angle gauge is used to measure the angle change of the clamping portion during the loading of the load. Wherein, the step of calculating the torsional moment may include: calculating the torsional moment based on the applied load and the angle measured by the angle gauge.

[0019] Preferably, the step of arranging the detection components may include: setting multiple detection lines on the surface of the wind turbine blade, the multiple detection lines extending along the chord direction of the wind turbine blade and spaced apart along the span direction of the wind turbine blade, and the multiple detection lines being used to detect the torsional deformation degree of multiple cross-sections of the wind turbine blade.

[0020] Alternatively, multiple spots are arranged on the wind turbine blade, the detection component includes a camera, the camera can capture pictures of the wind turbine blade during the loading of the load, and the controller can determine the torsional deformation data of the wind turbine blade based on the captured pictures.

[0021] By adopting the above torsional test system and torsional test method, the torsional stiffness of the wind turbine blade can be accurately calculated, avoiding aeroelastic problems and blade operation vibration problems caused by insufficient stiffness of the wind turbine blade, and being beneficial to the design and development of large-sized wind turbine blades. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] When described in detail below in conjunction with the drawings, the above and other objects, features and advantages of the present disclosure will be more clearly understood. In the drawings:

[0023] Figure 1 is a schematic plan view showing a torsional test system for a wind turbine blade according to an embodiment of the present disclosure;

[0024] Figure 2is a schematic plan view showing a torsional test system for a wind turbine blade according to another embodiment of the present disclosure;

[0025] Figure 3 is a cross-sectional view showing a torsional test system for a wind turbine blade according to a first embodiment of the present disclosure;

[0026] Figure 4 is a cross-sectional view showing a torsional test system for a wind turbine blade according to a second embodiment of the present disclosure;

[0027] Figure 5 is a cross-sectional view showing a torsional test system for a wind turbine blade according to a third embodiment of the present disclosure;

[0028] Figure 6 is a cross-sectional view showing a torsional test system for a wind turbine blade according to a fourth embodiment of the present disclosure. Detailed Description of the Embodiments

[0029] Embodiments according to the present disclosure will be described in detail with reference to the accompanying drawings, examples of which are shown in the drawings, wherein the same reference numerals always denote the same components.

[0030] Figure 1 and Figure 2 show schematic plan views of a torsional test system for a wind turbine blade according to two embodiments of the present disclosure, mainly showing detection lines and spots located on the surface of the wind turbine blade. Figures 3 to 6 show cross-sectional views of the torsional test system according to the first to fourth embodiments of the present disclosure, mainly showing the differences in the clamping part, the loading method, and the torsional test method. The following will refer to Figures 1 to 6 describe the specific structure and the torsional test method of the torsional test system for a wind turbine blade according to the present disclosure.

[0031] As Figures 1 to 6 shown, the torsional test system includes: a test bench 10 for fixing the root part of the wind turbine blade 20; a clamping part 30 for clamping the tip part of the wind turbine blade 20; a load loading part 40 connected to at least one side of the clamping part 30 for applying a load to the wind turbine blade 20 through the clamping part 30 to cause the wind turbine blade 20 to twist; a detection component for obtaining torsional deformation data at multiple positions of the wind turbine blade 20; a controller (not shown) for calculating the torsional moment applied by the load loading part 40 to the wind turbine blade 20 based on the loaded load, and determining the torsional stiffness of the wind turbine blade 20 according to the torsional moment and the torsional deformation data.

[0032] In the present disclosure, the load applied by the load application part 40 to the clamping part 30 can be transmitted to the wind turbine blade 20, causing the wind turbine blade 20 to twist. At the same time, the detection assembly can obtain the torsional deformation data at multiple positions of the wind turbine blade 20, and the controller calculates the torsional stiffness of the wind turbine blade 20 based on the torsional moment and the torsional deformation data of the wind turbine blade 20. By adopting the above torsional test system, the torsional stiffness of the wind turbine blade can be accurately calculated, so as to determine whether the comprehensive performance of the blade meets the design requirements of the wind turbine blade, avoid aeroelastic problems and blade operation vibration problems caused by insufficient stiffness of the wind turbine blade, and is beneficial to the design and development of large-sized wind turbine blades.

[0033] In one embodiment of the present disclosure, as Figure 1 shown, the detection assembly may include a plurality of detection lines 61 disposed on the surface of the wind turbine blade 20. The plurality of detection lines 61 extend along the chord direction of the wind turbine blade 20 and are spaced apart along the span direction of the wind turbine blade 20. The plurality of detection lines 61 are used to detect the torsional deformation degree of multiple cross-sections of the wind turbine blade 20. The controller determines the torsional deformation data (such as torsional angle and surface strain, etc.) of the wind turbine blade 20 based on the torsional deformation conditions of the multiple cross-sections detected by the detection lines 61. In the present disclosure, the setting interval of the detection lines 61 can be relatively small, so as to form dense detection lines 61 on the blade surface, so that the torsional deformation conditions of more cross-sections of the wind turbine blade 20 can be detected. The torsional deformation data can be calculated based on the deformation difference between two cross-sections (such as the cross-section before deformation and the cross-section after deformation, or two adjacent cross-sections) (which will be described in detail later). The blade characteristics are different at each cross-section. The closer the adjacent cross-sections are, the more representative the cross-section characteristics are, making the obtained blade characteristics more accurate and closer to the actual situation. The accuracy of the final evaluation result can be improved by increasing the density of the cross-section arrangement in the span direction.

[0034] By adopting a plurality of detection lines 61 to detect the torsional deformation degree of multiple cross-sections of the wind turbine blade 20, the blade surface data can be tested more comprehensively (more comprehensively and objectively reflecting the response of the wind turbine blade 20 under the action of the load), and the amount of the obtained torsional deformation data can be increased, thereby improving the accuracy of the torsional test simulation and the calculation of the torsional stiffness, and enhancing the rationality and reliability of the blade design and development. Compared with the detection method of dot distribution, since the detection lines 61 extend around the chord direction of the wind turbine blade 20 for one week, the measurement continuity of the detection lines 61 is better, the torsional deformation conditions of the entire cross-section of the wind turbine blade 20 can be measured, so the measurement accuracy of the detection lines 61 is higher, and the convergence of multiple measurement results is better.

[0035] Optionally, the above detection line 61 may be a resistance wire and is connected to a power source. During the loading of the load, the resistance wire generates heat due to the passage of current. The detection assembly may further include a thermal imaging device (not shown), and the thermal imaging device is capable of capturing a thermal image of the resistance wire during the loading of the load. The controller or computer can process the obtained thermal images of multiple cross-sections and obtain the torsional deformation data of the wind turbine blade through analysis and comparison.

[0036] Optionally, the above detection line 61 may be formed of a piezoelectric material. During the loading of the load, a piezoelectric signal is generated on the detection line 61. The detection assembly may further include a piezoelectric signal catcher (not shown), and the piezoelectric signal catcher is capable of obtaining the piezoelectric signal from the detection line 61 during the loading of the load. The controller or computer can process the obtained piezoelectric signals of multiple cross-sections and obtain the torsional deformation data of the wind turbine blade through analysis and comparison.

[0037] In another embodiment of the present disclosure, as Figure 2 shown, the detection assembly may include a camera (not shown), and a plurality of spots 62 may be provided on the surface of the wind turbine blade 20. For example, these spots 62 are arranged by spraying or sticking, and the density of these spots 62 is relatively high. The camera is capable of capturing pictures of the wind turbine blade 20 during the loading of the load, and the controller can determine the torsional deformation data (such as the torsional angle and surface strain, etc.) of the wind turbine blade 20 based on the captured pictures. For example, based on the DIC (Digital Image Correlation) measurement technique, by analyzing and comparing the captured pictures (which can be analyzed and compared based on the positions of the spots 62), the torsional deformation data of the wind turbine blade 20 can be obtained. For example, the image before deformation can be compared with the image after deformation, and the deformation difference between the two images can be obtained to calculate the torsional deformation data. Since a plurality of spots 62 are densely arranged on the surface of the wind turbine blade 20, the torsional deformation data of multiple positions on the blade surface can be obtained through the above method (the quantity of these data is much larger than the quantity collected by conventional methods), which makes the obtained torsional deformation data more accurate, so as to more comprehensively and objectively reflect the response of the wind turbine blade under the action of the load, thereby improving the accuracy of torsional test simulation and torsional stiffness calculation, and enhancing the rationality and reliability of blade design and development.

[0038] Next, the clamping portion 30, the angle gauge 50, and the load loading portion 40 of the torsional test system will be described with reference to Figures 3 to 6 As shown, the clamping portion 30 may include a first clamp 31 and a second clamp 32 which are oppositely arranged, and the first clamp 31 and the second clamp 32 respectively clamp the wind turbine blade 20 on the pressure side and the suction side of the wind turbine blade 20.

[0039] As Figures 3 to 6 shown, the clamping portion 30 may include a first clamp 31 and a second clamp 32 which are oppositely arranged, and the first clamp 31 and the second clamp 32 respectively clamp the wind turbine blade 20 on the pressure side and the suction side of the wind turbine blade 20.

[0040] The first fixture 31 and the second fixture 32 of the clamping portion 30 can be referred to as the fixture body, and the clamping portion 30 may further include a loading arm 33 extending outward from the fixture body. The torsional test system of the present disclosure may further include a protractor 50 (as Figure 3 and Figure 5 shown), and the protractor 50 is disposed on the loading arm 33. The protractor 50 is used to measure the angular change of the clamping portion 30 during the loading of the load. For example, it measures the angular change of the included angle between the load loading direction of the load loading portion 40 and the loading arm 33. The controller calculates the torsional moment applied by the load loading portion 40 to the wind turbine blade 20 based on the loaded load and the angle measured by the protractor 50. Since the torsional test system of the present disclosure considers the angular change of the clamping portion 30 during the calculation of the torsional moment, it can calculate more accurately the torsional moment applied by the load loading portion to the wind turbine blade, thereby improving the accuracy of the calculation of the torsional stiffness of the wind turbine blade.

[0041] However, the present disclosure is not limited thereto. The protractor can be installed at any position on the clamping portion as long as it can detect the angular change of the clamping portion. For example, the clamping portion may not include a loading arm, as Figure 6 shown, and the protractor can be installed at any position on the fixture body (e.g., the first fixture and / or the second fixture).

[0042] In addition, as Figure 3 and Figure 5 shown, the protractor 50 is installed on the loading arms 33 connected to each of the first fixture 31 and the second fixture 32. By measuring the angular changes of the included angles between the loading arms 33 connected to each of the first fixture 31 and the second fixture 32 and the load loading direction respectively by two protractors 50, the angular change of the clamping portion 30 can be determined more accurately. However, the present disclosure is not limited thereto. The protractor can be installed only on the loading arm connected to one of the first fixture and the second fixture as long as the protractor can measure the angular change of the clamping portion.

[0043] In Figures 3 to 5 the shown torsional test system, the load loading portion 40 applies a load to each of the first fixture 31 and the second fixture 32 through the loading arm 33, causing the wind turbine blade 20 to twist. However, the present disclosure is not limited thereto. The load loading portion can directly apply a load to each of the first fixture and the second fixture without passing through the loading arm. For example, in the case where the clamping portion does not include a loading arm, as Figure 6 shown, the load loading portion 40 can be directly connected to the fixture body.

[0044] In addition, in Figure 6 the shown embodiment, the load loading portion 40 can apply a load only to the second fixture 32 through a pulley 80, and no load is applied to the first fixture 31 by the load loading portion. In contrast, inFigures 3 to 5 In the illustrated embodiment, the load applying portion 40 applies a load to both the first clamp 31 and the second clamp 32. That is, the load applying portion 40 can perform bilateral loading on the clamping portion 30, or can perform unilateral loading on the clamping portion 30, and in both of these loading cases, the wind turbine blade 20 can be twisted. As Figures 3 to 6 shown, the load can be represented by a loading force F, and the arrow direction represents the loading direction of the load.

[0045] In addition, in Figures 3 to 6 the illustrated embodiment, a load sensor 70 can also be provided between the load applying portion 40 and the clamping portion 30 (for example, the loading arm 33 or the clamp body). The load sensor 70 can detect the magnitude of the load applied by the load applying portion 40 to the clamping portion 30 (more specifically, to the wind turbine blade 20). The controller can calculate the torsional moment applied by the load applying portion 40 to the wind turbine blade 20 based on the load detected by the load sensor 70. Two load sensors 70 are respectively installed on opposite sides of the clamping portion 30 (that is, the first clamp 31 side and the second clamp 32 side). By measuring the loads on both sides of the clamping portion 30 with the two load sensors 70, the magnitudes of the loads loaded on both sides of the clamping portion 30 can be determined, and whether the loads on both sides are consistent can be determined. If the loads on both sides are inconsistent, the clamping portion 30 will drive the wind turbine blade 20 to shake together, which affects the accuracy of the torsional test of the wind turbine blade 20. In addition, in the case where the loads on both sides of the clamping portion 30 are inconsistent, the load applied by the load applying portion 40 can be adjusted so that the loads on both sides of the clamping portion 30 are consistent.

[0046] In addition, as Figures 3 to 6 shown, the clamping portion 30 can further include a connecting rod 34, and both ends of the connecting rod 34 are respectively connected (for example, hinged) to the first clamp 31 and the second clamp 32. Specifically, two connecting rods 34 respectively connect the first clamp 31 and the second clamp 32 together on opposite sides of the first clamp 31 and the second clamp 32 (for example, Figures 3 to 5 the upper and lower sides shown in Figure 6 the left and right sides shown in). Therefore, during the torsional test, the first clamp 31 and the second clamp 32 can clamp the wind turbine blade 20 and prevent the first clamp 31 and the second clamp 32 from separating from each other. The presence of the connecting rod 34 does not affect the angular change of the first clamp 31 and the second clamp 32 (that is, does not affect the clamping portion 30 driving the wind turbine blade 20 to undergo torsional deformation).

[0047] In addition, the clamping portion 30 can further include an anti-translation component for preventing the clamping portion 30 from translating (or moving linearly) and not affecting the clamping portion 30 driving the wind turbine blade 20 to twist. For example, as Figure 3As shown, the anti-translational component can be the support rod 35. One end of the support rod 35 is connected to the connecting rod 34, and the other end is fixed (for example, fixed to the ground). Since the root of the fan blade 20 is fixed by the test bench 10, the translation of the clamping part 30 for clamping the tip of the blade will generate a bending moment on the fan blade 20. Here, "translation" refers to the translation of the fan blade 20 along the direction perpendicular to the span direction in addition to the torsional rotation around the span direction. This translation generates a bending moment on the fan blade 20 and causes the fan blade 20 to bend and deform.

[0048] However, the present disclosure is not limited thereto. The anti-translational component can also be any rigid component other than the support rod 35, as long as it can limit the translation of the clamping part 30 and thus prevent the generation of a bending moment on the fan blade 20.

[0049] In the present disclosure, the torsional test system can determine the torsional stiffness of the fan blade 20 through the pure torsional moment test method and the bending-torsion coupling test method. The difference between these two torsional test methods lies in whether the clamping part of the torsional test system undergoes translation. In addition, in the present disclosure, the torsional test system can not only calculate the torsional moment of the fan blade 20, but also analyze and process the data related to the bending moment of the fan blade 20. Figure 3 and Figure 4 shows an example of determining the torsional stiffness of the fan blade 20 through the pure torsional moment test method, and Figure 5 and Figure 6 shows an example of determining the torsional stiffness of the fan blade 20 through the bending-torsion coupling test method. The embodiments of the torsional test system for performing the above two torsional test methods will be described in detail below.

[0050] In Figure 3 the torsional test system for a fan blade according to the first embodiment of the present disclosure shown, the clamping part 30 can only rotate under the constraint of the support rod 35 and does not translate (the fan blade 20 can only be torsionally deformed and cannot be bent and deformed). That is to say, the support rod 35 restricts the translation of the fan blade 20 during the load application process, thereby preventing the generation of a bending moment on the fan blade 20. In this case, no bending moment is applied to the fan blade 20. Therefore, during the process of the controller calculating the torsional stiffness of the fan blade 20, only the data related to the torsional moment needs to be processed, and the data related to the bending moment does not need to be processed, so the data processing amount is less.

[0051] In Figure 4In the torsional test system for a wind turbine blade according to the second embodiment of the present disclosure shown, although there is no support rod to restrict the translation of the clamping portion 30, the loading arm 33 connected to the first fixture 31 is relatively fixed (for example, fixed to the ground). Therefore, during the load application process, the clamping portion 30 will not translate either, and can only rotate (the wind turbine blade 20 can only undergo torsional deformation and cannot undergo bending deformation). In this case, no bending moment is applied to the wind turbine blade 20. Therefore, during the process of the controller calculating the torsional stiffness of the wind turbine blade 20, only the data related to the torsional moment needs to be processed, and the data related to the bending moment does not need to be processed, so the amount of data processing is less.

[0052] In Figure 5 and Figure 6 In the torsional test systems for wind turbine blades according to the third and fourth embodiments of the present disclosure shown, there is no component to restrict the translation of the clamping portion 30. Therefore, during the load application process, the clamping portion 30 undergoes both rotation and translation (the wind turbine blade 20 undergoes torsional deformation and bending deformation). In Figure 6 In the shown torsional test system, the first fixture 31 is connected to the load sensor 70 through, for example, a rope, and then connected to the ground. Figure 5 and Figure 6 The difference between the torsional test systems in Figure 5 The torsional test system in Figure 6 is bilaterally loaded, while Figure 5 the torsional test system in Figure 6 is unilaterally loaded), and the direction in which the load application part 40 applies the load (

[0053] Although Figure 5 and Figure 6 the torsional test systems shown in

[0054] In addition, if the first fixture 31 of the clamping portion shown in Figure 6 is fixed to the ground through an anti-translation component (for example, using an anti-translation component (such as the support rod described above) to replace the rope connected between the first fixture 31 and the ground), then the obtained torsional test system makes the clamping portion unable to translate and can only rotate. Therefore, the wind turbine blade can only undergo torsional deformation and cannot undergo bending deformation. Thus, the obtained torsional test system can perform a pure torsional moment test.

[0055] In addition, as Figures 3 to 6 shown, within each of the first fixture 31 and the second fixture 32, there is a conformal block that matches the shape of the pressure side and the suction side of the fan blade 20. During the loading of the load, the conformal block can deform conforming to the shape of the pressure side and the suction side of the fan blade 20, so that the clamping portion 30 can stably clamp the fan blade 20. For example, within the first fixture 31, there is a first conformal block 311 that can conform to the shape of the pressure side of the fan blade 20. Within the second fixture 32, there is a second conformal block 321 that can conform to the shape of the suction side of the fan blade 20.

[0056] The torsional test method for a fan blade according to the present disclosure will be described in detail below. The torsional test method includes the following steps:

[0057] Fix the root of the fan blade 20 to the test bench 10, and clamp the tip of the fan blade 20 with the clamping portion 30 to keep the fan blade 20 in a horizontal state;

[0058] Arrange detection components at multiple positions on the surface of the fan blade 20 and connect the detection components to the controller;

[0059] Connect the load application portion 40 to at least one side of the clamping portion 30, and apply a load that causes the fan blade 20 to twist to the fan blade 20 through the clamping portion 30;

[0060] The controller obtains the torsional deformation data of the fan blade 20 from the detection components, calculates the torsional moment applied to the fan blade 20 by the load application portion 40 based on the applied load, and determines the torsional stiffness of the fan blade 20 according to the torsional moment and the torsional deformation data.

[0061] Optionally, the step of arranging the detection components may include: installing a protractor 50 on the clamping portion 30, and the protractor 50 is used to measure the angular change of the clamping portion 30 during the loading of the load. In addition, the step of calculating the torsional moment may include: calculating the torsional moment based on the applied load and the angle measured by the protractor 50.

[0062] Optionally, the step of arranging the detection components may include: arranging a plurality of detection lines 61 on the surface of the fan blade 20, the plurality of detection lines 61 extend along the chord direction of the fan blade 20 and are spaced apart along the span direction of the fan blade 20, and the plurality of detection lines 61 are used to detect the torsional deformation degree of multiple cross-sections of the fan blade 20. The torsional deformation data can be calculated based on the deformation difference between the cross-section before deformation and the cross-section after deformation of the fan blade 20 at the same detection line 60 and / or the deformation difference between two cross-sections of the fan blade 20 at two adjacent detection lines 61.

[0063] By collecting the torsional deformation data of multiple cross-sections, the torsional deformation of the blade surface of the entire wind turbine blade 20 can be determined. Specifically, the torsional deformation of the part of the blade surface between two adjacent cross-sections can be determined by difference analysis based on the torsional deformation of adjacent cross-sections, and by combining the torsional deformation of the multiple cross-sections collected and the torsional deformation determined by difference analysis, the torsional deformation of the blade surface of the entire wind turbine blade 20 can be determined.

[0064] Furthermore, the detection component may further include a thermal imaging device. The detection line 61 can be a resistance wire and is connected to a power supply, capable of generating heat during the loading of the load, and the thermal imaging device can capture the thermal image of the resistance wire during the loading of the load and send the thermal image to the controller. The controller can analyze the received thermal image to determine the torsional deformation of the blade surface.

[0065] Furthermore, the detection component may further include a piezoelectric signal catcher. The detection line 61 can be formed of a piezoelectric material. The piezoelectric signal catcher can obtain piezoelectric signals from the detection line 61 during the loading of the load and send the piezoelectric signals to the controller. The controller can analyze the piezoelectric signals to determine the torsional deformation of the blade surface.

[0066] Optionally, the step of arranging the detection component may include: arranging a plurality of spots 62 on the wind turbine blade 20. The detection component may include a camera. The camera can capture pictures of the wind turbine blade 20 during the loading of the load, and the controller can determine the torsional deformation data of the wind turbine blade 20 based on the captured pictures.

[0067] By adopting the above-mentioned torsional test system and torsional test method, the torsional stiffness of the wind turbine blade can be accurately calculated, so as to determine whether the comprehensive performance of the blade meets the design requirements of the wind turbine blade, avoid aeroelastic problems and blade operation vibration problems caused by insufficient stiffness of the wind turbine blade, and is beneficial to the design and development of large-sized wind turbine blades. In addition, by adopting the torsional test system of the present disclosure, the response of the wind turbine blade under the action of the load can be more comprehensively, objectively and accurately reflected, thereby improving the accuracy of torsional test simulation and torsional stiffness calculation, enhancing the rationality and reliability of blade design and development, and making the convergence of multiple measurement results better. When multiple detection lines are used to detect the torsional deformation degree of multiple cross-sections of the wind turbine blade, the measurement continuity is better, and the torsional deformation of the entire cross-section of the wind turbine blade can be obtained. Therefore, the measurement accuracy of the detection line is relatively high. When the torsional deformation degree of the wind turbine blade is detected by densely arranged spots, the torsional deformation data of multiple positions on the blade surface can be obtained. Therefore, the measurement accuracy of this method is relatively high.

[0068] Although some embodiments of the present disclosure have been shown and described, those skilled in the art should understand that these embodiments can be modified without departing from the principles and spirit of the present disclosure as defined by the claims and their equivalents.

Claims

1. A torsional test system for a wind turbine blade, characterized in that, The torsional test system includes: A test bench (10) for fixing the root of the fan blade (20); A clamping part (30) for clamping the tip of the fan blade (20); A load loading part (40) connected to at least one side of the clamping part (30) for applying a load to the fan blade (20) through the clamping part (30) to cause the fan blade (20) to twist; A detection component for obtaining torsional deformation data at multiple positions of the fan blade (20); An angle gauge (50) installed on the clamping part (30) for measuring the angle change of the clamping part (30) during the loading of the load; A controller calculates the torsional moment applied by the load loading part (40) to the fan blade (20) based on the loaded load and the angle measured by the angle gauge (50), and determines the torsional stiffness of the fan blade (20) according to the torsional moment and the torsional deformation data.

2. The torsional test system for a wind turbine blade according to claim 1, characterized in that, The detection component includes a plurality of detection lines (61) provided on the surface of the fan blade (20), the plurality of detection lines (61) extend along the chord direction of the fan blade (20) and are spaced apart along the span direction of the fan blade (20), and the plurality of detection lines (61) are used to detect the torsional deformation degree of multiple cross-sections of the fan blade (20).

3. The torsional test system for a wind turbine blade according to claim 2, characterized in that, The detection component further includes a thermal imaging device, the detection line (61) is a resistance wire and is connected to a power supply, can generate heat during the loading of the load, and the thermal imaging device can capture the thermal image of the resistance wire during the loading of the load.

4. The torsional test system for a wind turbine blade according to claim 2, characterized in that, The detection component further includes a piezoelectric signal catcher, the detection line (61) is formed of a piezoelectric material, and the piezoelectric signal catcher can obtain piezoelectric signals from the detection line (61) during the loading of the load.

5. The torsional test system for a wind turbine blade according to claim 1, characterized in that, The detection component includes a camera, and a plurality of spots (62) are provided on the surface of the fan blade (20), the camera can capture pictures of the fan blade (20) during the loading of the load, and the controller can determine the torsional deformation data of the fan blade (20) based on the captured pictures.

6. The torsional test system for a wind turbine blade according to claim 1, characterized in that, The clamping part (30) includes a fixture body and a loading arm (33) extending outward from the fixture body, and the angle gauge (50) is provided on the loading arm (33).

7. The torsional test system for a wind turbine blade according to claim 1, characterized in that, The clamping part (30) includes a first fixture (31) and a second fixture (32) arranged oppositely, and the first fixture (31) and the second fixture (32) clamp the fan blade (20) on the pressure side and the suction side of the fan blade (20) respectively.

8. The torsional test system for a wind turbine blade according to claim 7, characterized in that, The clamping part (30) further includes a connecting rod (34) and a support rod (35), two ends of the connecting rod (34) are respectively connected to the first fixture (31) and the second fixture (32), and one end of the support rod (35) is connected to the connecting rod (34) and the other end of the support rod (35) is fixed.

9. The torsional test system for a wind turbine blade according to claim 7, characterized in that, Inside each of the first fixture (31) and the second fixture (32), there is a conformal block that matches the shape of the pressure side and the suction side of the fan blade (20).

10. A torsional test system for a wind turbine blade, characterized in that, The torsional test system includes: A test bench (10) for fixing the root of the fan blade (20); A clamping part (30) for clamping the tip of the fan blade (20); A load loading part (40) connected to at least one side of the clamping part (30) for applying a load that causes the fan blade (20) to twist to the fan blade (20) through the clamping part (30); The detection component includes a plurality of detection lines (61) arranged on the surface of the fan blade (20), and the plurality of detection lines (61) extend along the chord direction of the fan blade (20) and are spaced apart along the span direction of the fan blade (20) for obtaining torsional deformation data at multiple positions of the fan blade (20); A controller calculates the torsional moment applied by the load loading part (40) to the fan blade (20) based on the loaded load, and determines the torsional stiffness of the fan blade (20) according to the torsional moment and the torsional deformation data.

11. The torsional test system for a wind turbine blade according to claim 10, characterized in that, The detection component further includes a thermal imaging device, the detection line (61) is a resistance wire and is connected to a power source, capable of generating heat during the loading process of the load, and the thermal imaging device can capture the thermal image of the resistance wire during the loading process of the load.

12. The torsional test system for a wind turbine blade according to claim 10, characterized in that, The detection component further includes a piezoelectric signal catcher, the detection line (61) is formed of a piezoelectric material, and the piezoelectric signal catcher can obtain piezoelectric signals from the detection line (61) during the loading process of the load.

13. A torsional test method for a wind turbine blade, characterized in that,The torsional test method includes the following steps: Fix the root of the fan blade (20) to the test bench (10), and clamp the tip of the fan blade (20) with the clamping part (30) to keep the fan blade (20) in a horizontal state; Arrange the detection component at multiple positions on the surface of the fan blade (20), and connect the detection component to the controller; Connect the load loading part (40) to at least one side of the clamping part (30), and apply a load that causes the fan blade (20) to twist to the fan blade (20) through the clamping part (30); The controller obtains the torsional deformation data of the fan blade (20) from the detection component, calculates the torsional moment applied by the load loading part (40) to the fan blade (20) based on the loaded load, and determines the torsional stiffness of the fan blade (20) according to the torsional moment and the torsional deformation data; The step of arranging the detection component includes: installing a protractor (50) on the clamping part (30), and the protractor (50) is used to measure the angle change of the clamping part (30) during the loading process of the load, Wherein, the step of calculating the torsional moment includes: calculating the torsional moment based on the loaded load and the angle measured by the protractor (50).

14. The torsional test method for a fan blade according to claim 13, wherein, The steps of arranging the detection component include: arranging a plurality of detection lines (61) on the surface of the wind turbine blade (20), the plurality of detection lines (61) extending along the chord direction of the wind turbine blade (20) and spaced apart along the span direction of the wind turbine blade (20), the plurality of detection lines (61) being used to detect the torsional deformation degree of a plurality of cross-sections of the wind turbine blade (20); Alternatively, arranging a plurality of spots (62) on the wind turbine blade (20), the detection component including a camera, the camera being capable of capturing pictures of the wind turbine blade (20) during the loading of the load, and the controller being capable of determining the torsional deformation data of the wind turbine blade (20) based on the captured pictures.

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