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A blade high-rigidity design method based on random isogeometric analysis

An isogeometric analysis and design method technology, applied in the field of ocean current energy power generation, can solve the problems that affect the accurate collection of random response information of blades, affect the accuracy of experimental results, and be unfeasible, achieve high stiffness design, and eliminate approximation errors. , Improve the effect of blade stiffness

Active Publication Date: 2019-05-17
ZHEJIANG UNIV
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The experimental method requires a large number of experiments to simulate uncertainties such as random loads. When collecting random response information such as displacement, it is impossible to arrange sensors on the entire surface of the blade, which affects the accurate collection of random response information of the blade and ultimately affects the accuracy of the experimental results.
In addition, in the optimization design process, the changing blade size makes the experimental method need to manufacture a large number of blades of different sizes, which is costly and unfeasible

Method used

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  • A blade high-rigidity design method based on random isogeometric analysis
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  • A blade high-rigidity design method based on random isogeometric analysis

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Embodiment Construction

[0047] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0048] figure 1 The flow chart is designed for the high stiffness of the blade, and the figure shows the flow chart of the stochastic isogeometric analysis method of the blade. The high stiffness design method of the blade is as follows:

[0049] 1) Airfoil parameterization, the initial airfoil of the blade, design variables and their value ranges are determined according to the airfoil design rules.

[0050] The NACA65421 airfoil was selected as the initial airfoil, which showed excellent hydrodynamic performance in the actual sea test. The airfoil curve of NACA 65421 is divided into four end-to-end curves, and the starting and ending points of the four curves are shown in Table 1.

[0051] Table 1

[0052] curve

starting point

end

1

trailing edge

suction surface apex

2

suction surface apex

lead...

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Abstract

The invention discloses a blade high-rigidity design method based on random isogeometric analysis. According to the method, firstly, a random field model of the material attribute and the external load is established according to the manufacturing condition and the service environment of the blade, on the basis, an optimal design model is established according to the high-rigidity design requirement and the lift-drag ratio constraint condition of the blade, and the model is solved. During the solving process, a random isogeometric analysis method is adopted for calculating the random displacement of the blade under the influence of the material attribute and the external load randomness, meanwhile, the maximum lift-drag ratio of the blade wing section is calculated, then the fitness of theindividual of the current population is calculated, and therefore high-rigidity design of the blade on the premise that the lift-drag ratio is guaranteed is achieved. According to the blade high-rigidity design method, the randomness of blade material attributes and external loads is comprehensively considered, a random isogeometric analysis method based on a random Krylov subspace base vector discrete scheme is adopted for calculating the random displacement of the blade, and the high-precision blade random displacement can be efficiently obtained.

Description

technical field [0001] The invention relates to the field of ocean current power generation, in particular to a blade high stiffness design method based on stochastic isogeometric analysis. Background technique [0002] A hot issue in the field of ocean current power generation is the high stiffness design of blades. In bad weather or astronomical high tides, etc., the blades are prone to deformation and damage. In order to increase the stiffness of the blade without increasing the weight and cost of the blade, the airfoil curve must be optimized to increase the stiffness of the blade while ensuring the hydrodynamic performance of the blade. Therefore, this is a blade stiffness maximization design problem under the constraints of hydrodynamic performance. [0003] The blades of the horizontal axis current energy generator are mostly made of composite materials, and their material properties have obvious randomness. The service environment of the horizontal axis current en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50G06N3/12
CPCG06N3/12G06F17/00Y02E10/30Y02P70/50G06F2111/08G06F30/17G06F30/28G06F2119/06G06F2111/06
Inventor 程锦杨明龙刘振宇谭建荣
Owner ZHEJIANG UNIV
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