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Dynamic Analysis of Composite Wind Turbine Blades as Beams: An Analytical and Numerical Study

机译：复合风力涡轮机叶片作为光束的动态分析：分析与数值研究

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This study focuses on the dynamic modelling and analysis of the wind turbine blades made of multiple layers of fibre reinforced composites and core materials. For this purpose, a novel three-dimensional analytical straight beam model for blades is formulated. This model assumes that the beam is made of functionally graded material (FGM) and has a variable and asymmetrical cross section. In this model, the blades are assumed to be thin, slender and long with a relatively straight axis. They have two main parts, namely the core and the shell. The so-called core consists of a lightweight isotropic foam material, which also adds significant damping to the system. The core material is covered by the shell, which is modelled using homogenous and orthotropic material assumptions as the structure is reinforced with continuous fibres. Therefore, the blades are modelled under a straight beam with varying cross-section assumptions, in which the effective elastic properties are acquired by homogenizing the cross section. The beam formulation for modelling the system is performed both analytically and numerically with the finite element method. The results of both methods are in well agreement. The maximum deviation between the results is found below 4%.
机译：本研究专注于由多层纤维增强复合材料和芯材料制成的风力涡轮机叶片的动态建模和分析。为此目的，配制了一种用于叶片的新型三维分析直束模型。该模型假设光束由功能渐变的材料（FGM）制成并且具有可变和不对称的横截面。在该模型中，假设刀片薄，细长和长的轴线。它们有两个主要部分，即核心和壳。所谓的核心由轻质各向同性泡沫材料组成，这也增加了对系统的显着阻尼。壳体覆盖壳，其使用均匀且正交材料假设建模，因为该结构用连续纤维增强。因此，叶片在具有变化的横截面假设的直梁下进行建模，其中通过使横截面均匀化获取有效的弹性特性。用于建模系统的光束配方在分析和数值上进行分析和数值。两种方法的结果都在一致。结果之间的最大偏差在低于4％以下。

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