Calculation method of load distribution of male mold system based on large wind power blades

A wind power generation blade and load distribution technology, which is applied in the direction of calculation, electrical digital data processing, special data processing applications, etc., can solve the problems of irregular load distribution of large wind power blade male mold system and irregular blade load distribution, etc. Achieve the effects of high precision, simple calculation, and guaranteed calculation accuracy

Inactive Publication Date: 2015-07-29
TONGJI UNIV
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AI-Extracted Technical Summary

Problems solved by technology

Due to the irregular shape of the blade model, it has been twisted and warped at the tail, resulting in irregular load dist...
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Abstract

The invention provides a load distribution calculation method of a male mould system based on a large wind power generation blade. On the basis that the male mould system is divided into three parts of a supporting steel frame, a section line cutting steel plate and a male mould surface glass bulb, the male mould surface glass bulb is divided into three layers of structures, namely, a glass bulb generation wood layer, a glass bulb glass steel layer and a glass bulb square steel layer. First, the supporting steel frame and the section line cutting steel plate are respectively conducted with load distribution solution seeking, and the three layers of structures of the male mould glass bulb are respectively conducted with load distribution calculation. Processing is conducted in the process of calculation through the methods that the male mould glass bulb is divided along the length direction of the blade in an equal interval mode, and then each small piece is conducted with discrete solution seeking and superposition calculation. The calculated discrete loads of the three layers of structures are conducted with superposition again. Curve fitting of discrete points is conducted through software matlab, and finally the load distribution function of the male mould system surface glass bulb and the distribution curve are obtained. The load distribution calculation method of the male mould system based on the large wind power generation blade has the advantages of being simple in calculation and high in precision.

Application Domain

Special data processing applications

Technology Topic

Steel platesTurbine blade +10

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  • Calculation method of load distribution of male mold system based on large wind power blades
  • Calculation method of load distribution of male mold system based on large wind power blades
  • Calculation method of load distribution of male mold system based on large wind power blades

Examples

  • Experimental program(1)

Example Embodiment

[0034] Example 1:
[0035] like Figure 1-Figure 5 As shown, the male mold system is composed of a glass bulb substitute wood layer 1, a glass bulb glass fiber reinforced plastic layer 2, a glass bulb square steel layer 3, a cross-section line-cutting steel plate 4 and a conformal support steel frame 5 to form a cross-section line-cutting steel plate, wherein: The conformal support steel frame 5 is placed on the ground, and the steel plate 4 is welded along the specified distance on the conformal support steel frame 5, and then the glass bulb square steel layer 3 and the glass bulb glass fiber reinforced plastic layer 2 are laid on the top of the section line cut steel plate 4 in turn. and glass bulb instead of wood layer 1; Figure 12 shown, the specific steps are as follows:
[0036] (1) Calculation of load distribution of supporting steel frame. Use APDL of ANSYS to build a random finite element model. After setting the gravity, the software itself calculates the load distribution (setting density 7800KG/m3, Poisson's ratio 2.1E11, element type BEAM188).
[0037] (2) Calculation of load distribution of section line cut steel plate. It is regarded as a point load at different sections, not a continuous load distribution. For the weight load calculation method of single-section wire-cut steel plate, use the AREA command in AUTO CAD to measure the area of ​​each section, and substitute the following formula to calculate the load of each selected section.
[0038]
[0039] (3) Calculation of the load distribution function of the glass bulb on the surface of the blade male mold. Since there are three layers of materials with different densities and thicknesses on the surface of the male mold glass bulb of the blade, the load distribution functions need to be calculated separately for them, and finally superimposed. like Figure 4 As shown in the figure, due to the irregular shape of the male mold glass bulb of the blade, this paper adopts the method of dividing the male mold glass bulb at equal intervals along the length of the blade, and then discretely solving each small block and superimposing the calculation method. The discrete loads of , are again superimposed, resulting in a series of discrete load values ​​at selected locations.
[0040] The specific calculation method adopts the following formula to calculate
[0041] , i=1,2,3.
[0042] in, Represents the load distribution function of the male mold glass bulb;
[0043] is the material density, is the acceleration of gravity;
[0044] respectively represent the load distribution function of each layer structure of the male mold glass bulb;
[0045] respectively represent the thickness of each layer structure of the male mold glass bulb;
[0046] Respectively represent the surface area of ​​each small block after the structure of each layer of the negative mold glass bulb is equally spaced.
[0047] The density and thickness of the given three-layer structure glass bulb substitute wood layer, 2 glass bulb glass fiber reinforced plastic layer, and 3 glass bulb square steel layer are: is 600KG/m3, is 1452 KG/m3, is 7800 KG/m3; Take 0.015m, Take 0.005m, Take 0.015m.
[0048] Measure and calculate the surface area of ​​each small piece to find out After a series of discrete values ​​of , use matlab's polyfit, polyval and other commands to perform 8th-degree polynomial fitting, and finally obtain the ideal load distribution function and distribution curve.
[0049] The load distribution functions and curves of the 9m (0.5MW), 44m (3MW), 62m (5MW), 75m (6MW) blade male mold systems (upper and lower molds) after superimposition are as follows Figure 6-11 shown.

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