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

Abstract

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%.

Coupled Dynamic Characteristics of a Spar-Type Offshore Floating Two-Bladed Wind Turbine with a Flexible Hub Connection

“…With the growing severity of environmental and energy issues, humans have become increasingly aware of the crucial significance of developing clean energy [1][2][3][4]. Drawing upon the statistical information provided by the International Energy Agency (IEA), it is evident that the renewable energy market share is experiencing a consistent rise, with wind power contributing significantly, accounting for 36% of the overall increase [5][6][7][8][9][10][11].…”

A Novel Semi-Spar Floating Wind Turbine Platform Applied for Intermediate Water Depth

“…Furthermore, a higher demand is placed on the design of mooring lines in intermediate water depths, as the layout of catenary mooring lines needs to be expanded to compensate for the loss of restoring forces due to the shortened vertical length. In addition, issues concerning vibration and the structural control of wind turbines also deserve much attention [8][9][10]. Despite its importance and complexity, only a few studies have suggested a conceptual design of a floating foundation applicable for intermediate water depths.…”

Optimization of Small Horizontal Axis Wind Turbines Based on Aerodynamic, Steady-State, and Dynamic Analyses

“…Altmimi et al [16] optimized the blade of the small wind turbines and studied the aero-structural design. Tüfekci et al [17] investigated the core and multiple layers of composite materials of DTU-10MW-RWT wind turbine blades. The modal and structural problems were studied by applying the Finite Element Method.…”