Wind power blade three-dimensional deformation reconstruction method, device, equipment and medium

Abstract

The invention discloses a wind power blade three-dimensional deformation reconstruction method and device, equipment and a medium, and the method comprises the steps: obtaining a target three-dimensional model of a target wind power blade, and extracting an initial orthogonal curvature value of each preset measurement point on the target wind power blade; acquiring orthogonal curvature data of each preset measuring point for load testing; obtaining the orthogonal strain variation of each preset measuring point after the load test, and based on the orthogonal curvature data and the orthogonal strain variation, determining the neutral surface position information of the section where each preset measuring point is located through the preset relationship between the structural curvature and the strain; calculating an actual orthogonal curvature value of the preset measuring point according to the initial orthogonal curvature value, the actual strain value of the preset measuring point and the position information of the neutral surface where the preset measuring point is located; and through a curved surface infinitesimal method, performing real-time three-dimensional deformation reconstruction on the target wind power blade according to the actual orthogonal curvature value in the service process and the preset condition data for the target wind power blade.

Description

Technical Field

[0001] The present invention relates to the technical field of structural deformation monitoring, and in particular to a method, device, equipment and medium for reconstructing three-dimensional deformation of a wind turbine blade. Background Art

[0002] With the rapid development of the wind power industry, wind turbine blades are gradually developing towards large sizes of hundreds of meters and high power of megawatts. The longer the wind turbine blades, the greater the bending deformation of the blades. During long-term operation, especially in complex wind conditions or extreme weather conditions, the blades may have angle deviations due to uneven force. If the clearance between the blade tip and the wind turbine tower is less than the safe distance, it will not only directly affect the performance and benefits of the wind turbine generator set, but also easily cause safety accidents such as blades hitting the wind turbine tower, which may cause blade damage at the least and cause the entire unit to collapse and be scrapped at the worst, causing significant economic losses. In order to reduce the occurrence of wind power equipment accidents, it is urgent to monitor the health status of wind turbine blades in real time.

[0003] The existing methods are mainly used to monitor the bending deformation of flat-plate structures. However, most actual engineering structures are irregular structures with complex deformations. They not only have bending deformations, but also torsional deformations caused by complex loads. For example, wind turbine blades are typical complex variable-section curved shell structures. Under the influence of complex wind forces and wind directions, they will undergo a combination of bending and torsion deformations. In this case, the monitoring method for the bending deformation of flat-plate structures cannot guarantee the reconstruction of the complex curved surface three-dimensional deformation with high accuracy. Summary of the invention

[0004] Based on this, it is necessary to propose a method, device, equipment and medium for reconstructing the three-dimensional deformation of wind turbine blades to address the technical problem of low accuracy in the existing technology when reconstructing the three-dimensional deformation of irregular structures.

[0005] In a first aspect, a method for reconstructing three-dimensional deformation of a wind turbine blade is provided, the method comprising:

[0006] By scanning the three-dimensional structure of the target wind turbine blade, a target three-dimensional model of the target wind turbine blade is obtained, and initial orthogonal curvature values ​​of each preset measuring point on the target wind turbine blade are extracted according to the target three-dimensional model;

[0007] Performing a load test on the target wind turbine blade, scanning and acquiring surface data of each preset measuring point on the target wind turbine blade under different test conditions, thereby acquiring orthogonal curvature data at each preset measuring point;

[0008] The orthogonal strain variation of each preset measuring point on the target wind turbine blade after the load test is obtained by an orthogonal fiber grating array sensor network laid on the surface of the target wind turbine blade, and the neutral plane position information of the cross section where each preset measuring point is located is determined based on the orthogonal curvature data and the orthogonal strain variation through the preset relationship between the structural curvature and the strain;

[0009] Calculate the actual orthogonal curvature value of the preset measuring point according to the initial orthogonal curvature value, the actual strain value of the preset measuring point during the service of the target wind turbine blade, and the neutral plane position information of the preset measuring point;

[0010] By using the surface infinitesimal method, the target wind turbine blade is reconstructed in real time based on the actual orthogonal curvature value during the service process and the preset condition data for the target wind turbine blade, thereby achieving real-time monitoring of the three-dimensional shape of the blade.

[0011] Optionally, before the step of obtaining the orthogonal strain variation of each preset measuring point on the target wind turbine blade after the load test through an orthogonal fiber grating array sensor network laid on the surface of the target wind turbine blade, the step further includes:

[0012] Acquiring three-dimensional structural data of the target wind turbine blade, and constructing a finite element model of the target wind turbine blade according to the three-dimensional structural data;

[0013] Determine the strain distribution characteristic data on the surface of the target wind turbine blade during the deformation process of the target wind turbine blade by performing mechanical analysis on the blade using the finite element model;

[0014] Determining layout data of the orthogonal grating array sensor network based on the strain distribution characteristic data;

[0015] The orthogonal grating array sensor network is arranged according to the layout data to obtain an orthogonal grating array sensor network arranged on a target wind turbine blade.

[0016] Optionally, the step of obtaining the orthogonal strain variation of each preset measuring point on the target wind turbine blade after the load test through an orthogonal fiber grating array sensor network laid on the surface of the target wind turbine blade comprises:

[0017] Using the fiber grating array sensor corresponding to the preset measuring point on the orthogonal grating array sensor network as a target sensor;

[0018] Obtaining a central wavelength offset of the target sensor after a load test;

[0019] The orthogonal strain variation of the preset measuring point is calculated according to the central wavelength offset.

[0020] Optionally, the step of reconstructing the target wind turbine blade in real time three-dimensional deformation according to the actual orthogonal curvature value in the service process and preset condition data for the target wind turbine blade by using a surface infinitesimal method comprises:

[0021] By using a surface infinitesimal method, the target wind turbine blade is segmented into different surface slices according to preset segmentation data in the preset condition data for the target wind turbine blade;

[0022] Fitting the surface patch according to the orthogonal curvature values ​​of the corner points on the surface patch using a quadratic surface equation to obtain a first fitting equation;

[0023] Constructing a first preset equation for the surface patch according to surface theory;

[0024] Combining the first fitting equation, the first preset equation, the preset constraint condition in the preset condition data, and the preset boundary condition in the preset condition data to obtain a first target equation group;

[0025] The preset constraint conditions include: the tangent directions of adjacent surface patch nodes are orthogonal to each other, and the first-order derivatives of adjacent surface patch nodes along the orthogonal directions are continuous;

[0026] The preset boundary conditions include: the relative spatial coordinates of the initial edges of the curved surface patches at the blade root remain unchanged, and the arc lengths of the shared edges of adjacent curved surface patches must remain the same;

[0027] The first target equation group is solved to obtain a first curved surface infinitesimal equation of the curved surface patch, and the three-dimensional deformation reconstruction of the target wind turbine blade is performed according to the first curved surface infinitesimal equation.

[0028] Optionally, the step of reconstructing the target wind turbine blade in real time three-dimensional deformation according to the actual orthogonal curvature value in the service process and preset condition data for the target wind turbine blade by using a surface infinitesimal method comprises:

[0029] When the surface patch corresponding to the first surface infinitesimal equation is not the last surface of the target wind turbine blade, taking the next surface patch of the surface patch as the target surface patch;

[0030] By using a quadratic surface equation, fitting the target surface patch according to the orthogonal curvature values ​​of the corner points on the target surface patch, obtaining a second fitting equation;

[0031] Constructing a second preset equation for the target surface patch according to surface theory;

[0032] Using the edge data of the surface patch as the target boundary condition, and using the arc length data of the surface patch in the preset condition data as the initial condition;

[0033] The second fitting equation, the second preset equation, the target boundary condition, the preset constraint condition and the initial condition are combined to obtain a second target equation group;

[0034] The second target equation group is solved to obtain a second surface infinitesimal equation of the target surface patch, and the target wind turbine blade is three-dimensionally reconstructed according to the first surface infinitesimal equation and the second surface infinitesimal equation.

[0035] Optionally, the step of reconstructing the target wind turbine blade in real time three-dimensional deformation according to the actual orthogonal curvature value in the service process and preset condition data for the target wind turbine blade by using the surface infinitesimal method further includes:

[0036] Obtaining arc length data of the surface patch;

[0037] Update the preset segmentation data in the preset condition data according to the arc length data to obtain updated segmentation data;

[0038] By using a surface infinitesimal method, segmenting the target wind turbine blade into different optimized surface slices according to the updated segmentation data;

[0039] By using a quadratic surface equation, fitting the optimized surface patch according to the orthogonal curvature values ​​of the corner points on the optimized surface patch, a third fitting equation is obtained;

[0040] Constructing a third preset equation for the optimized surface patch according to surface theory;

[0041] The third fitting equation, the third preset equation, the preset constraint conditions in the preset condition data and the preset boundary conditions in the preset condition data are combined to obtain a third target equation group;

[0042] The third target equation group is solved to obtain the third surface infinitesimal equation of the optimized surface patch, and the target wind turbine blade is reconstructed in three-dimensional deformation according to the third surface infinitesimal equation.

[0043] Optionally, the method further includes:

[0044] The strain field data and the deformation field data of the target wind turbine blade are determined based on the three-dimensional curved surface, and the strain field data and the deformation field data are visualized so that the strain field data and the deformation field data are displayed on the same interface.

[0045] In a second aspect, the present application provides a three-dimensional deformation reconstruction device for a wind turbine blade, the device comprising:

[0046] A data acquisition module, configured to obtain a target three-dimensional model of the target wind turbine blade by scanning the three-dimensional structure of the target wind turbine blade, and extract the initial orthogonal curvature value of each preset measuring point on the target wind turbine blade according to the target three-dimensional model;

[0047] A scanning module, used to perform a load test on the target wind turbine blade, scan and obtain surface data of each preset measuring point on the target wind turbine blade under different test conditions, thereby obtaining orthogonal curvature data at each preset measuring point;

[0048] A first calculation module is used to obtain the orthogonal strain variation of each preset measuring point on the target wind turbine blade after the load test through an orthogonal fiber grating array sensor network laid on the surface of the target wind turbine blade, and determine the neutral plane position information of the cross section where each preset measuring point is located through a preset relationship between structural curvature and strain based on the orthogonal curvature data and the orthogonal strain variation;

[0049] A second calculation module is used to calculate the actual orthogonal curvature value of the preset measuring point according to the initial orthogonal curvature value, the actual strain value of the preset measuring point during the service of the target wind turbine blade, and the neutral plane position information of the preset measuring point;

[0050] The reconstruction module is used to reconstruct the real-time three-dimensional deformation of the target wind turbine blade according to the actual orthogonal curvature value in the service process and the preset condition data for the target wind turbine blade through the surface infinitesimal method, so as to realize real-time monitoring of the three-dimensional shape of the blade.

[0051] In a fourth aspect, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the above-mentioned method for reconstructing three-dimensional deformation of a wind turbine blade are implemented.

[0052] The present application obtains a target three-dimensional model of the target wind turbine blade by scanning the three-dimensional structure of the target wind turbine blade, and extracts the initial orthogonal curvature value of each preset measuring point on the target wind turbine blade according to the target three-dimensional model; performs a load test on the target wind turbine blade, scans and obtains the surface data of each preset measuring point on the target wind turbine blade under different test conditions, thereby obtaining the orthogonal curvature data at each preset measuring point; obtains the orthogonal strain change at each preset measuring point on the target wind turbine blade after the load test through an orthogonal fiber grating array sensor network laid on the surface of the target wind turbine blade, Based on the orthogonal curvature data and the orthogonal strain variation, the neutral plane position information of the cross section at each preset measuring point is determined through the preset relationship between the structural curvature and the strain; the actual orthogonal curvature value of the preset measuring point is calculated according to the initial orthogonal curvature value, the actual strain value of the preset measuring point during the service process of the target wind turbine blade, and the neutral plane position information of the preset measuring point; through the surface infinitesimal method, the target wind turbine blade is reconstructed in real time in three-dimensional deformation according to the actual orthogonal curvature value during the service process and the preset condition data for the target wind turbine blade, so as to achieve real-time monitoring of the three-dimensional shape of the blade. The neutral plane of the blade structure is accurately calibrated by combining load testing with three-dimensional scanning to obtain the neutral plane data, ensuring the accurate calculation of the curvature value (orthogonal curvature value) of each node, thereby ensuring the accuracy of reconstruction when facing the reconstruction of the three-dimensional deformation of irregular structures, that is, making full use of the change of orthogonal curvature to achieve high-precision monitoring of the three-dimensional deformation (including bending deformation and torsional deformation) of the structure with known surface shape. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0054] in:

[0055] Figure 1 is a flow chart of a method for reconstructing three-dimensional deformation of a wind turbine blade in one embodiment;

[0056] Figure 2 A diagram showing the effect of setting up a fiber Bragg grating sensor network in one embodiment;

[0057] Figure 3 A schematic diagram of the structure of an orthogonal curvature surface microelement in one embodiment;

[0058] Figure 4This is the flow chart of surface reconstruction using the orthogonal curvature surface infinitesimal method in the three-dimensional deformation reconstruction method of wind turbine blades;

[0059] Figure 5 is a structural block diagram of a three-dimensional deformation reconstruction device for a wind turbine blade in one embodiment;

[0060] Figure 6 is a structural block diagram of a computer device in one embodiment;

[0061] Figure 7 It is a structural block diagram of a computer device in another embodiment. DETAILED DESCRIPTION

[0062] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0063] The present invention is described in detail below through specific embodiments.

[0064] See also Figure 1 As shown, Figure 1 A schematic flow chart of a method for reconstructing three-dimensional deformation of a wind turbine blade provided by an embodiment of the present invention includes the following steps:

[0065] S101, obtaining a target three-dimensional model of the target wind turbine blade by scanning the three-dimensional structure of the target wind turbine blade, and extracting initial orthogonal curvature values ​​of each preset measuring point on the target wind turbine blade according to the target three-dimensional model;

[0066] Exemplarily, the three-dimensional structure of the target wind turbine blade is scanned by a scanner to obtain the point position information of each point on the target wind turbine blade within the same coordinate system, and then the target three-dimensional model of the target wind turbine blade is obtained according to the point position information, preset measuring points are calibrated on the target three-dimensional model, and the initial orthogonal curvature value of each preset measuring point on the target wind turbine blade is determined.

[0067] S102, performing a load test on the target wind turbine blade, scanning and acquiring surface data of each preset measuring point on the target wind turbine blade under different test conditions, thereby acquiring orthogonal curvature data at each preset measuring point;

[0068] Exemplarily, scanning data of each preset measuring point on the target wind turbine blade after the load test is obtained through three-dimensional scanning technology. For example, a three-dimensional scanner is used to scan the target wind turbine blade after the load test to obtain scanning data of the target wind turbine blade after the load test, wherein the scanning data is point cloud data of a grating array orthogonal sensor in a grating array orthogonal sensing network laid on the target wind turbine blade. Since the grating array orthogonal sensors in the grating array orthogonal sensing network correspond to the preset measuring points, the curvature data along the normal of the cross-section where each preset measuring point is located is determined according to the point cloud data.

[0069] S103, obtaining the orthogonal strain variation of each preset measuring point on the target wind turbine blade after the load test through an orthogonal fiber grating array sensor network laid on the surface of the target wind turbine blade, and determining the neutral plane position information of the cross section where each preset measuring point is located through a preset relationship between structural curvature and strain based on the orthogonal curvature data and the orthogonal strain variation;

[0070] In a possible implementation manner, before the step of obtaining the orthogonal strain variation of each preset measuring point on the target wind turbine blade after the load test through the orthogonal fiber grating array sensor network laid on the surface of the target wind turbine blade, the step further includes:

[0071] Acquiring structural data of the target wind turbine blade, and constructing a finite element model of the target wind turbine blade according to the structural data;

[0072] Determining strain distribution characteristic data on the surface of the target wind turbine blade during the deformation of the target wind turbine blade by using the finite element model;

[0073] Determining layout data of the grating array orthogonal sensing network based on the strain distribution characteristic data;

[0074] The grating array orthogonal sensing network is arranged according to the layout data to obtain a grating array orthogonal sensing network arranged on a target wind turbine blade.

[0075] For example, Figure 2 As shown, the grating array orthogonal sensing network is composed of at least four grating array orthogonal sensors, wherein, after the grating array orthogonal sensing network is laid on the target wind turbine blade, the points on the target wind turbine blade corresponding to the grating array orthogonal sensors in the grating array orthogonal sensing network are used as preset measuring points, and the measurement data of the grating array orthogonal sensors when the target wind turbine blade is not deformed (when no load test is performed) are read, thereby determining the initial orthogonal curvature values ​​of the points on the target wind turbine blade corresponding to the grating array orthogonal sensors.

[0076] In a possible implementation, the step of obtaining the orthogonal strain variation of each preset measuring point on the target wind turbine blade after the load test by means of an orthogonal fiber grating array sensor network laid on the surface of the target wind turbine blade includes:

[0077] Using the fiber grating array sensor corresponding to the preset measuring point on the grating array orthogonal sensing network as a target sensor;

[0078] Obtaining a central wavelength offset of the target sensor after a load test;

[0079] The orthogonal strain variation of the preset measuring point is calculated according to the central wavelength offset.

[0080] Exemplarily, based on the relationship between grating wavelength drift and strain, the orthogonal strain change of the preset measuring point is calculated by the center wavelength offset. For example, when the relationship between grating wavelength drift and strain is characterized by a functional relationship, the offset value in the center wavelength offset is substituted into the relationship between the grating wavelength drift and strain to obtain the orthogonal strain change value of the preset measuring point after the load test, and the direction of the offset value in the center wavelength offset is used as the direction of the orthogonal strain change value to obtain the orthogonal strain change of the preset measuring point.

[0081] Exemplarily, the preset relationship between the structural curvature and strain is: k=1 / ρ=2ε / h, wherein k represents the curvature data, ρ is the arc radius of the arc where the preset measuring point is located, ε is the strain, and h is the surface thickness of the neutral plane where the preset measuring point is located.

[0082] Specifically, the surface thickness (neutral surface data) of the preset measuring point is calculated by combining the experimental parameters (strain parameters) of the load test, the curvature data of the normal direction of the cross section where the preset measuring point is located, and the preset relationship between the structural curvature and the strain.

[0083] S104, calculating the actual orthogonal curvature value of the preset measuring point according to the initial orthogonal curvature value, the actual strain value of the preset measuring point during the service of the target wind turbine blade, and the neutral plane position information of the preset measuring point;

[0084] Exemplarily, the initial orthogonal curvature value is the orthogonal curvature value of each preset measuring point obtained before the target wind turbine blade is subjected to a load test. Specifically, the grating array orthogonal sensor network on the target wind turbine blade is connected to a demodulator to obtain initial wavelength data of the grating array orthogonal sensor network, and the initial orthogonal curvature value is calculated based on the wavelength data.

[0085] S105 , performing real-time three-dimensional deformation reconstruction of the target wind turbine blade according to the actual orthogonal curvature value in the service process and preset condition data for the target wind turbine blade by using a surface infinitesimal method, thereby achieving real-time monitoring of the three-dimensional shape of the blade.

[0086] For example, Figure 3 As shown, when the surface infinitesimal method performs three-dimensional deformation reconstruction on the target wind turbine blade, the target wind turbine blade is decomposed into numerous tiny "element processes (surface patches)", and the rules followed by each "element process (surface patch)" are the same, that is, after the three-dimensional deformation reconstruction is performed on each surface patch, the surface patches after the three-dimensional deformation reconstruction are associated according to the structure of the target wind turbine blade to obtain the three-dimensional surface of the target wind turbine blade.

[0087] The initial orthogonal curvature value of each preset measuring point on the target wind turbine blade is obtained by a grating array orthogonal sensing network arranged on the target wind turbine blade; scanning data of each preset measuring point on the target wind turbine blade under different test conditions is obtained, and curvature data along each preset measuring point is determined according to the scanning data; the orthogonal strain change amount of each preset measuring point on the target wind turbine blade after the load test is obtained by the grating array orthogonal sensing network, and the neutral plane position information of each preset measuring point is determined based on the curvature data and the orthogonal strain change amount through the preset relationship between the structural curvature and the strain; the orthogonal curvature value of the preset measuring point is calculated according to the initial orthogonal curvature value, the actual strain value of the preset measuring point during the service process, and the neutral plane position information of the preset measuring point; the three-dimensional deformation of the target wind turbine blade is reconstructed in real time according to the orthogonal curvature value and the preset condition data for the target wind turbine blade through the surface infinitesimal method, so as to obtain the three-dimensional surface of the target wind turbine blade during the service process. By combining load testing with three-dimensional scanning, the neutral plane of the blade structure is accurately calibrated to obtain the neutral plane data, ensuring the accurate calculation of the curvature value (orthogonal curvature value) of each node, thereby ensuring the accuracy of reconstruction when facing the three-dimensional deformation of irregular structures, that is, making full use of the changes in orthogonal curvature to achieve high-precision monitoring of the three-dimensional deformation (including bending deformation and torsional deformation) of structures with known surface morphology.

[0088] In a possible implementation, the step of reconstructing the target wind turbine blade in real time three-dimensional deformation according to the actual orthogonal curvature value in the service process and preset condition data for the target wind turbine blade by using the surface infinitesimal method includes:

[0089] By using a surface infinitesimal method, the target wind turbine blade is segmented into different surface slices according to preset segmentation data in the preset condition data for the target wind turbine blade;

[0090] Fitting the surface patch according to the orthogonal curvature values ​​of the corner points on the surface patch using a quadratic surface equation to obtain a first fitting equation;

[0091] Constructing a first preset equation for the surface patch according to surface theory;

[0092] Combining the first fitting equation, the first preset equation, the preset constraint condition in the preset condition data, and the preset boundary condition in the preset condition data to obtain a first target equation group;

[0093] The first target equation group is solved to obtain a first curved surface infinitesimal equation of the curved surface patch, and the three-dimensional deformation reconstruction of the target wind turbine blade is performed according to the first curved surface infinitesimal equation.

[0094] For example, Figure 3 and Figure 4 As shown in the figure, since the wind turbine blade is a complex variable cross-section curved shell structure, its surface equation is difficult to describe with a standard surface equation. Therefore, the surface infinitesimal method is used to divide the blade into several surface slices according to the characteristics of the blade surface structure (the preset segmentation data in the preset condition data). For the deformation problem of the wind turbine blade, the quadratic surface equation is used to fit the deformed surface of the blade. The surface equation of each surface slice (the first fitting equation) is set as:

[0095] z(x,y)=a+bx+cy+dxy+ex 2 +fy 2

[0096] Among them, a, b, c, d, e, and f are unknown parameters. As long as these 6 unknown parameters are found, the three-dimensional surface of the blade can be fitted. x and y are the formal parameters of the standard surface equation.

[0097] Specifically, according to surface theory, the first-class basic quantity and the second-class basic quantity of the surface patch have the following relationship:

[0098] E=1+(b+dy+2ex) 2

[0099] F=(b+dy+2ex)(c+dx+2fy)

[0100] G=1+(c+dx+2fy) 2

[0101]

[0102] in:

[0103]

[0104] Get the first preset equation:

[0105]

[0106] represents the orthogonal normal curvature of a point on the surface element, Represents the angle between the normal curvature and the principal curvature direction, k 1(i,j) and k 2(i,j) Represents the orthogonal curvature of a point on the surface element, (i, j) represents the preset measuring point, n1 and n2 represent the direction. From the Euler formula, we can know that the relationship between the normal curvature and the principal curvature of a point on the surface element is:

[0107]

[0108] Adding Euler's formula gives:

[0109]

[0110] From the mean curvature H i,j The definition formula is:

[0111]

[0112] In the above formula, the mean curvature H i,j It can be determined by the first and second basic quantities of the surface:

[0113]

[0114] In the formula, E, F, G are the first type of basic quantities, L, M, N are the second type of basic quantities, and we can get:

[0115]

[0116] Finally, combined with the constraints and boundary conditions of the initial surface patch near the blade root, the above equations are solved to solve the deformed surface patch (surface element P i,j ) equation.

[0117] In a possible implementation, the step of reconstructing the target wind turbine blade in real time three-dimensional deformation according to the actual orthogonal curvature value in the service process and preset condition data for the target wind turbine blade by using the surface infinitesimal method includes:

[0118] When the surface patch corresponding to the first surface infinitesimal equation is not the last surface of the target wind turbine blade, taking the next surface patch of the surface patch as the target surface patch;

[0119] By using a quadratic surface equation, fitting the target surface patch according to the orthogonal curvature values ​​of the corner points on the target surface patch, obtaining a second fitting equation;

[0120] Constructing a second preset equation for the target surface patch according to surface theory;

[0121] Using the edge data of the surface patch as the target boundary condition, and using the arc length data of the surface patch in the preset condition data as the initial condition;

[0122] The second fitting equation, the second preset equation, the target boundary condition, the preset constraint condition and the initial condition are combined to obtain a second target equation group;

[0123] The second target equation group is solved to obtain a second surface infinitesimal equation of the target surface patch, and the target wind turbine blade is three-dimensionally reconstructed according to the first surface infinitesimal equation and the second surface infinitesimal equation.

[0124] Exemplarily, when the surface patch corresponding to the first surface infinitesimal equation is not the last surface of the target wind turbine blade, the end position of the surface patch corresponding to the first surface infinitesimal equation and the arc length data of the initially divided surface patch are used as the initial condition and boundary condition of the next surface patch of the surface patch, and combined with the measured orthogonal curvature data of the four corner points of the target surface patch, the surface infinitesimal solution process is looped until the reconstruction process of the entire deformed target wind turbine blade surface is completed.

[0125] In a possible implementation manner, the step of reconstructing the target wind turbine blade in real time three-dimensional deformation according to the actual orthogonal curvature value during the service process and preset condition data for the target wind turbine blade by using the surface infinitesimal method further includes:

[0126] Obtaining arc length data of the surface patch;

[0127] Update the preset segmentation data in the preset condition data according to the arc length data to obtain updated segmentation data;

[0128] By using a surface infinitesimal method, segmenting the target wind turbine blade into different optimized surface slices according to the updated segmentation data;

[0129] By using a quadratic surface equation, fitting the optimized surface patch according to the orthogonal curvature values ​​of the corner points on the optimized surface patch, a third fitting equation is obtained;

[0130] Constructing a third preset equation for the optimized surface patch according to surface theory;

[0131] The third fitting equation, the third preset equation, the preset constraint conditions in the preset condition data and the preset boundary conditions in the preset condition data are combined to obtain a third target equation group;

[0132] The third target equation group is solved to obtain the third surface infinitesimal equation of the optimized surface patch, and the target wind turbine blade is reconstructed in three-dimensional deformation according to the third surface infinitesimal equation.

[0133] For example, when the target wind turbine blade is deformed, the arc length of the neutral surface remains unchanged, but the upper and lower surfaces of the target wind turbine blade must be stretched or compressed, which causes the arc length of each surface microelement obtained by the sensor network division to change. Therefore, in order to more accurately calculate the upper and lower surface shapes after deformation, the arc length data of the surface piece is obtained; the preset segmentation data in the preset condition data is updated according to the arc length data to obtain the updated segmentation data, that is, the four arc lengths of the surface are updated to ensure the accuracy of the calculation of the position of each preset measuring point, thereby ensuring the high accuracy of the surface reconstruction.

[0134] In a possible implementation, the method further includes:

[0135] The strain field data and the deformation field data of the target wind turbine blade are determined based on the three-dimensional curved surface, and the strain field data and the deformation field data are visualized so that the strain field data and the deformation field data are displayed on the same interface.

[0136] Exemplarily, by determining the strain field data and deformation field data of the target wind turbine blade, and displaying the strain field data and the deformation field data on the same interface, the strain field data and the deformation field data can be displayed to the user in comparison, making it convenient for the user to intuitively understand the real-time data of the target wind turbine blade.

[0137] In a possible implementation, Figure 5 As shown, a three-dimensional deformation reconstruction device for a wind turbine blade is provided, the device comprising:

[0138] The data acquisition module 201 is used to obtain a target three-dimensional model of the target wind turbine blade by scanning the three-dimensional structure of the target wind turbine blade, and extract the initial orthogonal curvature value of each preset measuring point on the target wind turbine blade according to the target three-dimensional model;

[0139] The scanning module 202 is used to perform a load test on the target wind turbine blade, scan and obtain surface data of each preset measuring point on the target wind turbine blade under different test conditions, so as to obtain orthogonal curvature data at each preset measuring point;

[0140] The first calculation module 203 is used to obtain the orthogonal strain variation of each preset measuring point on the target wind turbine blade after the load test through an orthogonal fiber grating array sensor network laid on the surface of the target wind turbine blade, and determine the neutral plane position information of the cross section where each preset measuring point is located through a preset relationship between structural curvature and strain based on the orthogonal curvature data and the orthogonal strain variation;

[0141] A second calculation module 204 is used to calculate the actual orthogonal curvature value of the preset measuring point according to the initial orthogonal curvature value, the actual strain value of the preset measuring point during the service of the target wind turbine blade, and the neutral plane position information of the preset measuring point;

[0142] The reconstruction module 205 is used to reconstruct the real-time three-dimensional deformation of the target wind turbine blade according to the actual orthogonal curvature value in the service process and the preset condition data for the target wind turbine blade by using the surface infinitesimal method, so as to realize real-time monitoring of the three-dimensional shape of the blade.

[0143] The target three-dimensional model of the target wind turbine blade is obtained by scanning the three-dimensional structure of the target wind turbine blade, and the initial orthogonal curvature value of each preset measuring point on the target wind turbine blade is extracted according to the target three-dimensional model; the target wind turbine blade is subjected to load test, and the surface data of each preset measuring point on the target wind turbine blade under different test conditions is obtained by scanning, so as to obtain the orthogonal curvature data at each preset measuring point; the orthogonal strain change amount of each preset measuring point on the target wind turbine blade after the load test is obtained by an orthogonal fiber grating array sensor network laid on the surface of the target wind turbine blade, and based on The orthogonal curvature data and the orthogonal strain variation are used to determine the neutral plane position information of the cross section at each preset measuring point through the preset relationship between the structural curvature and the strain; the actual orthogonal curvature value of the preset measuring point is calculated according to the initial orthogonal curvature value, the actual strain value of the preset measuring point during the service process of the target wind turbine blade, and the neutral plane position information of the preset measuring point; the target wind turbine blade is reconstructed in real time in three-dimensional deformation according to the actual orthogonal curvature value during the service process and the preset condition data for the target wind turbine blade through the surface infinitesimal method, so as to realize real-time monitoring of the three-dimensional shape of the blade. The neutral plane of the blade structure is accurately calibrated by combining the load test with the three-dimensional scanning method to obtain the neutral plane data, so as to ensure the accurate calculation of the curvature value (orthogonal curvature value) of each node, and then ensure the accuracy of the reconstruction when facing the reconstruction of the three-dimensional deformation of the irregular structure, that is, to make full use of the change of the orthogonal curvature to realize the high-precision monitoring of the three-dimensional deformation (including bending deformation and torsional deformation) of the structure with a known surface shape.

[0144] In one embodiment, a computer device is provided. The computer device may be a server, and its internal structure diagram may be as follows: Figure 6 As shown. The computer device includes a processor, a memory, a network interface and a database connected via a system bus. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile and / or volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The network interface of the computer device is used to communicate with an external client via a network connection. When the computer program is executed by the processor, it realizes the functions or steps of a service-side method for reconstructing three-dimensional deformation of a wind turbine blade.

[0145] In one embodiment, a computer device is provided. The computer device may be a client, and its internal structure diagram may be as follows: Figure 7 As shown. The computer device includes a processor, a memory, a network interface, a display screen and an input device connected via a system bus. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The network interface of the computer device is used to communicate with an external server via a network connection. When the computer program is executed by the processor, the functions or steps on the client side of a method for reconstructing three-dimensional deformation of a wind turbine blade are implemented.

[0146] In one embodiment, a computer device is provided, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the following steps when executing the computer program: obtaining a target three-dimensional model of the target wind turbine blade by scanning the three-dimensional structure of the target wind turbine blade, and extracting initial orthogonal curvature values ​​of each preset measuring point on the target wind turbine blade according to the target three-dimensional model; performing a load test on the target wind turbine blade, scanning and obtaining surface data of each preset measuring point on the target wind turbine blade under different test conditions, thereby obtaining orthogonal curvature data at each preset measuring point; and obtaining orthogonal curvature data at each preset measuring point by laying an orthogonal fiber grating array on the surface of the target wind turbine blade. A series sensing network is used to obtain the orthogonal strain variation of each preset measuring point on the target wind turbine blade after the load test, and based on the orthogonal curvature data and the orthogonal strain variation, the neutral plane position information of the cross section at each preset measuring point is determined through the preset relationship between the structural curvature and the strain; the actual orthogonal curvature value of the preset measuring point is calculated according to the initial orthogonal curvature value, the actual strain value of the preset measuring point during the service of the target wind turbine blade, and the neutral plane position information of the preset measuring point; and the target wind turbine blade is reconstructed in real time in three-dimensional deformation according to the actual orthogonal curvature value during the service and the preset condition data for the target wind turbine blade through the surface infinitesimal method, so as to realize real-time monitoring of the three-dimensional shape of the blade.

[0147] By combining load testing with three-dimensional scanning, the neutral plane of the blade structure is accurately calibrated to obtain the neutral plane data, ensuring the accurate calculation of the curvature value (orthogonal curvature value) of each node, thereby ensuring the accuracy of reconstruction when facing the three-dimensional deformation of irregular structures, that is, making full use of the changes in orthogonal curvature to achieve high-precision monitoring of the three-dimensional deformation (including bending deformation and torsional deformation) of structures with known surface morphology.

[0148] In one embodiment, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the following steps are implemented: a target three-dimensional model of the target wind turbine blade is obtained by scanning the three-dimensional structure of the target wind turbine blade, and initial orthogonal curvature values ​​of each preset measuring point on the target wind turbine blade are extracted according to the target three-dimensional model; a load test is performed on the target wind turbine blade, and surface data of each preset measuring point on the target wind turbine blade under different test conditions is scanned to obtain orthogonal curvature data at each preset measuring point; and the orthogonal fiber grating array sensor network laid on the surface of the target wind turbine blade is used to obtain the orthogonal curvature data of the preset measuring points. The orthogonal strain variation of each preset measuring point on the target wind turbine blade after the load test is determined, based on the orthogonal curvature data and the orthogonal strain variation, by using the preset relationship between the structural curvature and the strain to determine the neutral plane position information of the cross section where each preset measuring point is located; the actual orthogonal curvature value of the preset measuring point is calculated according to the initial orthogonal curvature value, the actual strain value of the preset measuring point during the service of the target wind turbine blade and the neutral plane position information of the preset measuring point; and the target wind turbine blade is reconstructed in real time in three-dimensional deformation according to the actual orthogonal curvature value during the service and the preset condition data for the target wind turbine blade by using the surface infinitesimal method, so as to realize real-time monitoring of the three-dimensional shape of the blade.

[0149] By combining load testing with three-dimensional scanning, the neutral plane of the blade structure is accurately calibrated to obtain the neutral plane data, ensuring the accurate calculation of the curvature value (orthogonal curvature value) of each node, thereby ensuring the accuracy of reconstruction when facing the three-dimensional deformation of irregular structures, that is, making full use of the changes in orthogonal curvature to achieve high-precision monitoring of the three-dimensional deformation (including bending deformation and torsional deformation) of structures with known surface morphology.

[0150] It should be noted that the above functions or steps that can be implemented by the computer-readable storage medium or computer device can refer to the relevant descriptions on the server side and the client side in the aforementioned method embodiment. To avoid repetition, they will not be described one by one here.

[0151] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0152] Those skilled in the art can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example. In actual applications, the above-mentioned functions can be distributed and completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above.

[0153] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A three-dimensional deformation reconstruction method for a wind turbine blade, characterized in that: The method comprises: By scanning the three-dimensional structure of the target wind turbine blade, a target three-dimensional model of the target wind turbine blade is obtained, and initial orthogonal curvature values ​​of each preset measuring point on the target wind turbine blade are extracted according to the target three-dimensional model; Performing a load test on the target wind turbine blade, scanning and acquiring surface data of each preset measuring point on the target wind turbine blade under different test conditions, thereby acquiring orthogonal curvature data at each preset measuring point; The orthogonal strain variation of each preset measuring point on the target wind turbine blade after the load test is obtained by an orthogonal fiber grating array sensor network laid on the surface of the target wind turbine blade, and the neutral plane position information of the cross section where each preset measuring point is located is determined based on the orthogonal curvature data and the orthogonal strain variation through the preset relationship between the structural curvature and the strain; Calculate the actual orthogonal curvature value of the preset measuring point according to the initial orthogonal curvature value, the actual strain value of the preset measuring point during the service of the target wind turbine blade, and the neutral plane position information of the preset measuring point; By using the surface infinitesimal method, the target wind turbine blade is reconstructed in real time based on the actual orthogonal curvature value during the service process and the preset condition data for the target wind turbine blade, thereby achieving real-time monitoring of the three-dimensional shape of the blade.

2. The three-dimensional deformation reconstruction method of a wind turbine blade according to claim 1, characterized in that: Before the step of obtaining the orthogonal strain variation of each preset measuring point on the target wind turbine blade after the load test through the orthogonal fiber grating array sensor network laid on the surface of the target wind turbine blade, the step further includes: Acquiring three-dimensional structural data of the target wind turbine blade, and constructing a finite element model of the target wind turbine blade according to the three-dimensional structural data; Determine the strain distribution characteristic data on the surface of the target wind turbine blade during the deformation process of the target wind turbine blade by performing mechanical analysis on the blade using the finite element model; Determining layout data of the orthogonal grating array sensor network based on the strain distribution characteristic data; The orthogonal grating array sensor network is arranged according to the layout data to obtain an orthogonal grating array sensor network arranged on a target wind turbine blade.

3. The three-dimensional deformation reconstruction method of a wind turbine blade according to claim 1, characterized in that: The step of obtaining the orthogonal strain variation of each preset measuring point on the target wind turbine blade after the load test through an orthogonal fiber grating array sensor network laid on the surface of the target wind turbine blade comprises: Using the fiber grating array sensor corresponding to the preset measuring point on the orthogonal grating array sensor network as a target sensor; Obtaining a central wavelength offset of the target sensor after a load test; The orthogonal strain variation of the preset measuring point is calculated according to the central wavelength offset.

4. The three-dimensional deformation reconstruction method of a wind turbine blade according to claim 1, characterized in that: The step of reconstructing the target wind turbine blade in real time three-dimensional deformation according to the actual orthogonal curvature value in the service process and the preset condition data for the target wind turbine blade by using the surface infinitesimal method comprises: By using a surface infinitesimal method, the target wind turbine blade is segmented into different surface slices according to preset segmentation data in the preset condition data for the target wind turbine blade; Fitting the surface patch according to the orthogonal curvature values ​​of the corner points on the surface patch using a quadratic surface equation to obtain a first fitting equation; Constructing a first preset equation for the surface patch according to surface theory; The first fitting equation, the first preset equation, the preset constraint condition in the preset condition data and the preset boundary condition in the preset condition data are combined to obtain a first target equation group; The preset constraint conditions include: the tangent directions of adjacent surface patch nodes are orthogonal to each other, and the first-order derivatives of adjacent surface patch nodes along the orthogonal directions are continuous; The preset boundary conditions include: the relative spatial coordinates of the initial edges of the curved surface patches at the blade root remain unchanged, and the arc lengths of the shared edges of adjacent curved surface patches must remain the same; The first target equation group is solved to obtain a first curved surface infinitesimal equation of the curved surface patch, and the three-dimensional deformation reconstruction of the target wind turbine blade is performed according to the first curved surface infinitesimal equation.

5. The three-dimensional deformation reconstruction method of a wind turbine blade according to claim 4, characterized in that: The step of reconstructing the target wind turbine blade in real time three-dimensional deformation according to the actual orthogonal curvature value in the service process and the preset condition data for the target wind turbine blade by using the surface infinitesimal method comprises: When the surface patch corresponding to the first surface infinitesimal equation is not the last surface of the target wind turbine blade, taking the next surface patch of the surface patch as the target surface patch; By using a quadratic surface equation, fitting the target surface patch according to the orthogonal curvature values ​​of the corner points on the target surface patch, a second fitting equation is obtained; Constructing a second preset equation for the target surface patch according to surface theory; Using the edge data of the curved surface patch as the target boundary condition, and using the arc length data of the curved surface patch in the preset condition data as the initial condition; The second fitting equation, the second preset equation, the target boundary condition, the preset constraint condition and the initial condition are combined to obtain a second target equation group; The second target equation group is solved to obtain a second surface infinitesimal equation of the target surface patch, and the target wind turbine blade is three-dimensionally reconstructed according to the first surface infinitesimal equation and the second surface infinitesimal equation.

6. The three-dimensional deformation reconstruction method of a wind turbine blade according to claim 4, characterized in that: The step of reconstructing the target wind turbine blade in real time three-dimensional deformation according to the actual orthogonal curvature value in the service process and the preset condition data for the target wind turbine blade by using the surface infinitesimal method also includes: Obtaining arc length data of the surface patch; Update the preset segmentation data in the preset condition data according to the arc length data to obtain updated segmentation data; By using a surface infinitesimal method, segmenting the target wind turbine blade into different optimized surface slices according to the updated segmentation data; By using a quadratic surface equation, fitting the optimized surface patch according to the orthogonal curvature values ​​of the corner points on the optimized surface patch, a third fitting equation is obtained; Constructing a third preset equation for the optimized surface patch according to surface theory; The third fitting equation, the third preset equation, the preset constraint conditions in the preset condition data and the preset boundary conditions in the preset condition data are combined to obtain a third target equation group; The third target equation group is solved to obtain the third surface infinitesimal equation of the optimized surface patch, and the target wind turbine blade is reconstructed in three-dimensional deformation according to the third surface infinitesimal equation.

7. The three-dimensional deformation reconstruction method of a wind turbine blade according to claim 1, characterized in that: The method further comprises: The strain field data and the deformation field data of the target wind turbine blade are determined based on the three-dimensional curved surface, and the strain field data and the deformation field data are visualized so that the strain field data and the deformation field data are displayed on the same interface.

8. A three-dimensional deformation reconstruction device for a wind turbine blade, characterized in that: The device comprises: A data acquisition module, configured to obtain a target three-dimensional model of the target wind turbine blade by scanning the three-dimensional structure of the target wind turbine blade, and extract the initial orthogonal curvature value of each preset measuring point on the target wind turbine blade according to the target three-dimensional model; A scanning module, used to perform a load test on the target wind turbine blade, scan and obtain surface data of each preset measuring point on the target wind turbine blade under different test conditions, thereby obtaining orthogonal curvature data at each preset measuring point; A first calculation module is used to obtain the orthogonal strain variation of each preset measuring point on the target wind turbine blade after the load test through an orthogonal fiber grating array sensor network laid on the surface of the target wind turbine blade, and determine the neutral plane position information of the cross section where each preset measuring point is located through a preset relationship between structural curvature and strain based on the orthogonal curvature data and the orthogonal strain variation; A second calculation module is used to calculate the actual orthogonal curvature value of the preset measuring point according to the initial orthogonal curvature value, the actual strain value of the preset measuring point during the service of the target wind turbine blade, and the neutral plane position information of the preset measuring point; The reconstruction module is used to reconstruct the real-time three-dimensional deformation of the target wind turbine blade according to the actual orthogonal curvature value in the service process and the preset condition data for the target wind turbine blade through the surface infinitesimal method, so as to realize real-time monitoring of the three-dimensional shape of the blade.

9. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the three-dimensional deformation reconstruction method of a wind turbine blade are implemented as described in any one of claims 1 to 7.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the three-dimensional deformation reconstruction method of a wind turbine blade are implemented as claimed in any one of claims 1 to 7.

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