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

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...

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

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