A High Stiffness Design Method for Blades Based on Stochastic Isogeometric Analysis

Abstract

The invention discloses a blade high rigidity design method based on stochastic isogeometric analysis. This method first establishes the random field model of its material properties and external loads according to the manufacturing situation and service environment of the blade. Solve. During the solution process, the stochastic isogeometric analysis method is used to calculate the random displacement of the blade under the influence of material properties and external load randomness, and at the same time calculate the maximum lift-drag ratio of the blade airfoil, and then calculate the fitness of the current population individual, thus realizing The high stiffness design of the blade under the premise of ensuring the lift-to-drag ratio. The blade high stiffness design method proposed by the present invention comprehensively considers the randomness of the blade material properties and external loads, and uses the random isogeometric analysis method based on the random Krylov subspace basis vector discrete scheme to calculate the random displacement of the blade, which can efficiently obtain high precision random displacement of the leaves.

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...

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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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