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Method for determining wind turbine blade structure based on finite difference method

A technology of wind turbine blades and finite difference method, which is applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as long design cycle and high requirements for design experience, so as to simplify design complexity and ensure Aerodynamic efficiency and structural strength, the effect of realizing lightweight design

Active Publication Date: 2011-04-06
CHINA ACAD OF AEROSPACE AERODYNAMICS
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  • Application Information

AI Technical Summary

Problems solved by technology

In the design of modern large-scale wind turbine blades, the blade is still simplified into a cantilever beam, and the structural design of the blade is completed through repeated iterations. This traditional design method not only requires a long design cycle, but also requires high design experience.

Method used

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  • Method for determining wind turbine blade structure based on finite difference method
  • Method for determining wind turbine blade structure based on finite difference method
  • Method for determining wind turbine blade structure based on finite difference method

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Experimental program
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Embodiment Construction

[0030] The present invention as figure 1 shown in the following steps:

[0031] 1. According to the given layering method of the wind turbine blade, the longitudinal elastic constant E of the wind turbine blade is obtained by using the blanket curve method.

[0032] The wind turbine blade is a composite material structure. First, determine a lay-up form during design. For example, compare the traditional 0° / 90° / ±45° with the [60 / 20 / 20] lay-up method, and calculate it according to the blanket curve method. The longitudinal elastic constant E of the laminate is obtained.

[0033] For the principle of the blanket curve method, see: Wang Yaoxian, "Composite Material Structure Design", Chemical Industry Press, September 2001.

[0034] 2. Divide the blade of the wind turbine into n equal parts according to the length, and obtain n cross-sections, each of which has a length of h.

[0035] For large megawatt wind turbine blades, in order to make the design more reasonable, n is gen...

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Abstract

The invention discloses a method for determining a wind turbine blade structure based on a finite difference method. The structure design by the finite difference method is coincident with the design process of the blade. Pneumatic profile of the blade is designed firstly and then the structural design is carried out on the premise of determining the pneumatic profile so as to ensure the pneumatic efficiency and structural strength of the blade. By using the finite difference method, three-dimensional design is changed into two-dimensional design so as to simplify the design complexity. Due to the adoption of a reverse finite difference method, the deformation control design of the blade is realized. By taking theoretical section flexural rigidity as a design target, the section area is restrained so as to realize the light-weight design of the blade.

Description

technical field [0001] The invention relates to a method for determining the structure of a wind turbine blade based on a finite difference method, belongs to the technical field of wind turbine blade structure design, and is used for the structural design of large wind turbine blades or large-span glass fiber / carbon fiber composite materials. Background technique [0002] With the rapid development of wind turbine blades' large-scale trend, it is necessary to establish a fast and reliable blade design method. At present, in the process of structural design, the blade is simplified as a multi-cavity cantilever beam with an airfoil section. The designer must consider the material thickness distribution of the blade, and at the same time ensure that the strength and stiffness requirements are met, which is difficult and often requires multiple iterations to complete. Structural design plans that meet the requirements. According to the characteristics of high strength of glass...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 康传明张卫民
Owner CHINA ACAD OF AEROSPACE AERODYNAMICS
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