Method for simulating geometric shape of bonding angle at front edge of wind power blade

Abstract

The invention provides a wind power blade front edge bonding angle geometric shape simulation method. The method comprises the steps that a plurality of sections parallel to the blade root end face are cut out in a blade three-dimensional shape at preset intervals; taking the front edge parting line as a starting point, cutting out a plurality of points on the section contours of the plurality of sections towards the rear edge direction, obtaining coordinates of the plurality of points to construct a front edge laying simulation mathematical model, and obtaining a front edge laying simulation model according to laying information of the blade front edge area and the size of the structural adhesive, offset is carried out on the contour coordinates of the multiple sections, and the contour coordinates after offset in the front edge bonding angle area are obtained; and on the basis of the shifted contour coordinates, fitting each section of the front edge bonding angle area into a spline curve, fitting according to all the spline curves to obtain a spline surface, and obtaining the shape of the front edge bonding angle mold. According to the invention, efficient and accurate simulation of the front edge bonding angle mold can be realized, the matching degree is high, and the production efficiency and the product performance are improved.

Description

Technical Field

[0001] The invention relates to the technical field of wind turbine blades, and in particular to a method for simulating the geometric shape of a leading edge bonding angle of a wind turbine blade. Background Art

[0002] When manufacturing wind turbine blades, the SS surface and PS surface need to be vacuum-infused separately, and then bonded together through mold closing. In the leading edge bonding area, the leading edge bonding angle needs to be used to bond the SS surface and PS surface. The adhesive can be applied to either the SS or PS surface. Therefore, the preparation of the leading edge bonding angle mold is crucial for wind turbine blades.

[0003] Currently, the main method is to respectively pour the bonding corner mold components on the PS surface and SS surface of the shell mold, and make the bonding corner mold by mold bonding. However, this method is time-consuming and labor-intensive and has poor matching degree with the actual wind turbine blade.

[0004] Therefore, there is an urgent need for a method for simulating the geometric shape of the leading edge bonding angle of a wind turbine blade that can achieve efficient and accurate simulation of the leading edge bonding angle mold to improve work efficiency and product performance. Summary of the invention

[0005] Based on this, it is necessary to provide a method for simulating the geometric shape of the bonding angle of the leading edge of a wind turbine blade in order to address the above technical issues.

[0006] A method for simulating the geometric shape of the leading edge bonding angle of a wind turbine blade comprises the following steps: based on the three-dimensional shape of the blade, a plurality of cross sections parallel to the blade root end face are intercepted in the three-dimensional shape of the blade at preset intervals; based on the plurality of cross sections, a plurality of points are intercepted on the cross-sectional contour of the plurality of cross sections in the direction of the trailing edge with the leading edge parting line as the starting point, and the arc length distance between two adjacent points in the plurality of points is equal, the coordinates of the plurality of points are obtained, and a leading edge ply simulation mathematical model is constructed according to the coordinates of the plurality of points; using the leading edge ply simulation mathematical model, the contour coordinates of the plurality of cross sections are offset according to the ply information and structural adhesive size of the leading edge region of the blade, and the offset contour coordinates in the leading edge bonding angle region are obtained; based on the offset contour coordinates, each cross section in the leading edge bonding angle region is fitted as a spline curve, and a spline surface is obtained according to all the spline curves, and the leading edge bonding angle mold shape is obtained according to the spline surface.

[0007] In one embodiment, the method of constructing a leading edge ply simulation mathematical model according to the coordinates of the plurality of points includes: selecting two points A on the cross-sectional profile. k (x k ,y k ), A k+1 (x k+1 ,y k+1 ), and establish the mathematical model for leading edge ply simulation as follows:

[0008]

[0009] In the formula, T is the single layer thickness of the wind turbine blade, and α is the angle between the line between the two points and the horizontal axis.

[0010] In one of the embodiments, the ply information includes all plies, ply positioning information, ply type and single layer thickness; the structural adhesive size includes structural adhesive width and structural adhesive thickness.

[0011] In one of the embodiments, based on the offset contour coordinates, each cross-section of the leading edge bonding angle area is fitted as a spline curve, and a spline surface is obtained based on all the spline curves, and the leading edge bonding angle mold shape is obtained based on the spline surface, including: using the least squares curve fitting method, based on the offset contour coordinates, each cross-section of the leading edge bonding angle area is fitted as a spline curve; combining all the spline curves obtained by fitting the leading edge bonding angle area to perform re-fitting to obtain a spline surface; and obtaining a simulated leading edge bonding angle mold shape based on the spline surface.

[0012] Compared with the prior art, the advantages and beneficial effects of the present invention are as follows: based on the three-dimensional shape of the blade designed for the wind turbine blade, a plurality of sections parallel to the blade root end face are intercepted on the three-dimensional shape of the blade at preset intervals; based on the plurality of sections, a plurality of points are intercepted on the cross-sectional contour of the plurality of sections in the direction of the trailing edge with the leading edge parting line as the starting point, and the arc length distance between two adjacent points in the plurality of points is equal, the coordinates of the plurality of points are obtained, and used to construct a leading edge ply simulation mathematical model; using the leading edge ply simulation mathematical model, the contour coordinates of the plurality of sections are offset according to the ply information and the structural adhesive size of the leading edge region of the blade, and the offset contour coordinates in the leading edge bonding angle region are obtained; based on the offset contour coordinates of the plurality of points, each section in the leading edge bonding angle region is fitted as a spline curve, and a spline surface is obtained according to all the spline curves, and the leading edge bonding angle mold shape is obtained according to the spline surface, so as to realize a fast and accurate three-dimensional simulation of the geometric shape of the leading edge bonding angle mold, which is helpful to improve the production efficiency of wind turbine blades, and the simulated shape is more in line with the actual situation of the wind turbine blades, and the overall performance of the wind turbine blades can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of a flow chart of a method for simulating the geometric shape of the bonding angle of the leading edge of a wind turbine blade in one embodiment;

[0014] Figure 2 A schematic diagram of a cross section and two selected points in a bonding angle area of ​​a leading edge of a wind turbine blade in one embodiment;

[0015] Figure 3is a schematic structural diagram of a leading edge ply simulation model in one embodiment;

[0016] Figure 4 Schematic diagram of the structure of the front edge bonding corner mold in one embodiment. DETAILED DESCRIPTION

[0017] Before describing the specific embodiments of the present invention, the overall concept of the present invention is described as follows:

[0018] The present invention is mainly developed based on the simulation process of the leading edge bonding angle of a wind turbine blade. Currently, the preparation process of the leading edge bonding angle mold of a wind turbine blade is time-consuming and labor-intensive, and the matching degree with the leading edge of the wind turbine blade is low, which affects the overall performance of the wind turbine blade.

[0019] Therefore, the present invention proposes a method for simulating the geometric shape of the leading edge bonding angle of a wind turbine blade. Based on the three-dimensional shape of the blade designed for the wind turbine blade, multiple sections parallel to the blade root end face are intercepted on the three-dimensional shape of the blade at preset intervals; based on the multiple sections, with the leading edge parting line as the starting point, multiple points are intercepted on the cross-sectional contours of the multiple sections toward the trailing edge, and the arc length distance between two adjacent points in the multiple points is equal, the coordinates of the multiple points are obtained, and used to construct a leading edge ply simulation mathematical model; using the leading edge ply simulation mathematical model, according to the ply information and structural adhesive size of the leading edge area of ​​the blade, the contour coordinates of the multiple sections are offset to obtain the offset contour coordinates in the leading edge bonding angle area; based on the offset contour coordinates of the multiple points, each section in the leading edge bonding angle area is fitted as a spline curve, and a spline surface is obtained according to all the spline curves, and the leading edge bonding angle mold shape is obtained according to the spline surface, so as to realize a fast and accurate three-dimensional simulation of the geometric shape of the leading edge bonding angle mold, which is helpful to improve the production efficiency of wind turbine blades, and the simulated shape is more in line with the actual situation of wind turbine blades, which can improve the overall performance of wind turbine blades.

[0020] After introducing the overall concept of the present invention, in order to make the purpose, technical solution and advantages of the present invention more clear, the present invention is further described in detail by specific implementation methods in combination with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0021] In one embodiment, Figure 1 As shown, a method for simulating the geometric shape of the bonding angle of the leading edge of a wind turbine blade is provided, comprising the following steps:

[0022] Step S101 : based on the three-dimensional shape of the blade, a plurality of cross sections parallel to the blade root end surface are cut out in the three-dimensional shape of the blade at preset intervals.

[0023] Specifically, after the leading edge ply design of the wind turbine blade is finalized, simulation software is used to simulate and generate the three-dimensional shape of the wind turbine blade. Based on the obtained three-dimensional shape of the blade, an automated secondary development program is used in the three-dimensional software to cut multiple cross sections parallel to the root end face at preset intervals on the three-dimensional shape of the blade.

[0024] Step S102, based on the multiple cross sections, taking the leading edge parting line as the starting point, intercepting multiple points on the cross-sectional contours of the multiple cross sections toward the trailing edge, and the arc length distance between two adjacent points in the multiple points is equal, obtaining the coordinates of the multiple points, and constructing a leading edge ply simulation mathematical model based on the coordinates of the multiple points.

[0025] Specifically, according to the multiple cross-sections obtained by interception, N points are intercepted on the cross-sectional contours of the multiple cross-sections from the leading edge parting line toward the trailing edge of the SS surface or the PS surface, and the arc length distance between two adjacent points in the multiple points is equal, and the arc length distance between two adjacent points is set to Y millimeters, and the coordinates of the multiple points are obtained.

[0026] After the wind turbine blades are manufactured, they need to be designed with plies on the surface to improve the overall performance of the blades. However, since the coordinates obtained at this time are the cross-sectional profile coordinates of the wind turbine blades without plies, after the plies are designed on the blade surface, a leading edge plies simulation mathematical model is constructed based on the coordinates of multiple existing points. The cross-sectional profile after the plies are simulated by the leading edge plies simulation mathematical model to achieve the offset of the cross-sectional profile coordinates, which helps to improve the matching degree between the simulated leading edge bonding angle mold and the actual wind turbine blade.

[0027] The steps of constructing the mathematical model of the leading edge ply simulation include: selecting two points A on the cross-sectional profile k (x k ,y k ), A k+1 (x k+1 ,y k+1 ), and establish the mathematical model for leading edge ply simulation as follows:

[0028]

[0029] In the formula, T is the single layer thickness of the wind turbine blade, and α is the angle between the line between the two points and the horizontal axis.

[0030] like Figure 2 As shown in the figure, taking a section of the bonding angle area of ​​the leading edge of a wind turbine blade as an example, the front edge of the SS front die seam is taken as the starting point, N points are intercepted on the section contour, and two points A on the SS surface are selected. k (x k ,y k ), A k+1 (x k+1 ,yk+1 ), establish Figure 3 The mathematical model for simulating the leading edge ply is shown, where T is the design thickness of a single layer of the wind turbine blade ply, and α is the angle between the line between the two points and the horizontal axis.

[0031] Step S103, using the leading edge ply simulation mathematical model, according to the ply information and structural adhesive size of the leading edge area of ​​the blade, the contour coordinates of multiple cross sections are offset to obtain the offset contour coordinates in the leading edge bonding angle area.

[0032] Specifically, there are many designs for the layup, including the material used for the layup, the designed thickness of the layup, and the size of the structural adhesive. Therefore, after constructing the mathematical model for the leading edge layup simulation, it is necessary to offset the contour coordinates of multiple sections based on the layup information and the size of the structural adhesive in the leading edge area of ​​the wind turbine blade, so as to obtain the contour coordinates of all sections after the offset in the leading edge bonding angle area.

[0033] The ply information includes all plies, ply positioning information, ply type and single layer thickness; the structural adhesive size includes structural adhesive width and structural adhesive thickness.

[0034] Specifically, based on the layup information in the wind turbine blade design, such as all the layups used, layup positioning information, layup type and single-layer thickness, and structural adhesive dimensions, such as structural adhesive width and structural adhesive thickness, the cross-section contour coordinates are offset to obtain position information that is more consistent with the actual wind turbine blade, ensuring the fit between the simulated leading edge bonding angle and the leading edge of the wind turbine blade.

[0035] Step S104, based on the offset contour coordinates, each cross section of the leading edge bonding angle region is fitted as a sample curve, and a spline surface is obtained by fitting all spline curves, and the leading edge bonding angle mold shape is obtained according to the spline surface.

[0036] Specifically, each cross section of the leading edge bonding angle region is fitted into a spline curve according to the contour coordinates after the multiple points are offset; and further, a spline surface is fitted according to all the spline curves obtained by fitting to form the leading edge bonding angle mold shape. The final leading edge bonding angle mold shape is as follows: Figure 4 As shown, it is used to assist the leading edge bonding of the wind turbine blade, realizes accurate and rapid geometric simulation of the leading edge bonding angle mold shape, improves the matching with the leading edge of the wind turbine blade, and helps to improve the performance of the wind turbine blade.

[0037] Among them, step S104 includes: using the least squares curve fitting method, based on the offset contour coordinates, fitting each cross-section of the leading edge bonding angle area into a spline curve; combining all the spline curves obtained by fitting the leading edge bonding angle area, fitting again to obtain a spline surface; and obtaining a simulated leading edge bonding angle mold shape based on the spline surface.

[0038] Specifically, the least squares curve fitting method is used to calculate the m linearly independent functions in a cross section. Function class composed of solving spline curves The formula is:

[0039]

[0040] When calculating, all the contour coordinates (x i ,y i ), (i=1,2,...n) into formula (2) for calculation, and according to Minimum as a condition a1,a2,...a in the function m Thus, we can solve As a spline curve.

[0041] All spline curves obtained by fitting the leading edge bonding angle area are fitted again to obtain a spline surface, and finally the leading edge bonding angle mold shape is formed according to the spline surface, thereby realizing rapid simulation of the leading edge bonding angle geometric shape, and the generated mold has a high degree of match with the actual leading edge of the wind turbine blade, which is helpful to improve the overall performance of the wind turbine blade.

[0042] In this embodiment, based on the three-dimensional shape of the blade designed for the wind turbine blade, multiple sections parallel to the blade root end face are intercepted on the three-dimensional shape of the blade at preset intervals; based on the multiple sections, with the leading edge parting line as the starting point, multiple points are intercepted on the cross-sectional contours of the multiple sections in the direction of the trailing edge, and the arc length distance between two adjacent points in the multiple points is equal, the coordinates of the multiple points are obtained, and used to construct a leading edge ply simulation mathematical model; using the leading edge ply simulation mathematical model, according to the ply information and structural adhesive size of the leading edge area of ​​the blade, the contour coordinates of the multiple sections are offset to obtain the offset coordinates in the leading edge bonding angle area; based on the offset contour coordinates, each section in the leading edge bonding angle area is fitted as a spline curve, and a spline surface is obtained according to all the spline curves, and the leading edge bonding angle mold shape is obtained according to the spline surface, so as to realize a fast and accurate three-dimensional simulation of the geometric shape of the leading edge bonding angle mold, which is helpful to improve the production efficiency of wind turbine blades, and the simulated shape is more in line with the actual situation of wind turbine blades, with a high degree of matching, which can effectively improve the overall performance of wind turbine blades.

[0043] A person skilled in the art can understand that all or part of the processes in the above-mentioned embodiments can be implemented by instructing the relevant hardware through a computer program, and the program can be stored in a computer-readable storage medium, and when the program is executed, it can include the processes of the embodiments of the above-mentioned methods. The storage medium can be a disk, an optical disk, a read-only memory (ROM) or a random access memory (RAM), etc.

[0044] Obviously, those skilled in the art should understand that the modules or steps of the present invention described above can be implemented by a general-purpose computing device, they can be concentrated on a single computing device, or distributed on a network composed of multiple computing devices, and optionally, they can be implemented by a program code executable by a computing device, so that they can be stored in a computer storage medium (ROM / RAM, magnetic disk, optical disk) and executed by the computing device, and in some cases, the steps shown or described can be executed in a different order than that here, or they can be made into individual integrated circuit modules, or multiple modules or steps therein can be made into a single integrated circuit module for implementation. Therefore, the present invention is not limited to any specific combination of hardware and software.

[0045] The above contents are further detailed descriptions of the present invention in combination with specific implementation methods, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the scope of protection of the present invention.

Claims

1. A method for simulating the geometric shape of the bonding angle of the leading edge of a wind turbine blade, characterized in that: The following steps are involved: Based on the three-dimensional shape of the blade, a plurality of cross sections parallel to the blade root end surface are cut out from the three-dimensional shape of the blade at preset intervals; According to the multiple cross sections, taking the leading edge parting line as the starting point, intercepting multiple points on the cross-sectional contours of the multiple cross sections in the direction of the trailing edge, and the arc lengths between two adjacent points in the multiple points are equal, obtaining the coordinates of the multiple points, and constructing a leading edge ply simulation mathematical model according to the coordinates of the multiple points; Using the leading edge ply simulation mathematical model, according to the ply information and structural adhesive size of the leading edge region of the blade, the contour coordinates of the plurality of cross sections are offset to obtain the offset contour coordinates in the leading edge bonding angle region; Based on the offset contour coordinates, each cross section of the leading edge bonding angle region is fitted as a spline curve, and a spline surface is obtained according to all the spline curves, and the leading edge bonding angle mold shape is obtained according to the spline surface.

2. The method for simulating the geometric shape of the leading edge bonding angle of a wind turbine blade according to claim 1, characterized in that: The method of constructing a leading edge ply simulation mathematical model according to the coordinates of the plurality of points comprises: Select two points A on the cross-section profile k (x k ,y k ), A k+1 (x k+1 ,y k+1 ), and establish the mathematical model for leading edge ply simulation as follows: In the formula, T is the single layer thickness of the wind turbine blade, and α is the angle between the line between the two points and the horizontal axis.

3. The method for simulating the geometric shape of the leading edge bonding angle of a wind turbine blade according to claim 1, characterized in that: The ply information includes all plies, ply positioning information, ply type and single layer thickness; the structural adhesive size includes structural adhesive width and structural adhesive thickness.

4. The method for simulating the geometric shape of the leading edge bonding angle of a wind turbine blade according to claim 1, characterized in that: The method of fitting each cross section of the leading edge bonding angle region into a spline curve based on the offset contour coordinates, obtaining a spline surface based on all the spline curves, and obtaining the leading edge bonding angle mold shape based on the spline surface includes: Using a least square curve fitting method, each cross section of the leading edge bonding angle region is fitted into a spline curve based on the offset contour coordinates; All spline curves obtained by fitting the front edge bonding angle area are combined and fitted again to obtain a spline surface; The front edge bonding angle mold shape is obtained by simulation based on the spline surface.

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