Abstract
Throughout their operating life, offshore wind turbine blades are subjected to considerable wind forces. In order to ensure their durability and strength the intrados and extrados are bounded around spars, which are the skeleton that provide the necessary rigidity to the blade. Wind turbine blades are complex structures given the various scientific fields involved in their study, from aerodynamic to composite fatigue and failure analysis. Wind turbine blade is under coupled process of forces, so when we have the same natural frequency for the blade and exciting forces, the resonance is occurred. Which make the modal analysis of the blade of great importance, hence the scope of the present work, which deal with determining, the natural modes shapes and frequencies of three spars forms during free vibration, as well as for a 5 MW horizontal axis floating wind turbine blade, to prevent and avoid resonance effect, using ABAQUS Finite element analysis software. The results show that the resonance effect does not occur for the blade and the proposed layup model provide enough resistance to the structure.
Highlights
We noticed over the last decade an exponential growth in the demand for electrical energy in the world, due to the increase of the population and the need of modern comfort
The experimental modal analysis (EMA) involve mechanical exciting to the structure using strikes with instrumented hammers depending on the system (Small -> lighter / Industrial -> heavier), and the vibration are measured using an accelerometer, or by acoustic / fluid systems [14,15,16]
We aim to investigate the structural modal analysis of a 5 MW horizontal axis floating wind turbine blade and the effect of spars shape by defining the natural frequencies
Summary
We noticed over the last decade an exponential growth in the demand for electrical energy in the world, due to the increase of the population and the need of modern comfort. Wind turbine blades are complex structures made of 3D surfaces resulting from the assembly of airfoil sections with various chord lengths, different twist angles, and pitch axis locations They are usually constructed from several composites parts ‘‘generally glass-fiber/epoxy” and glued together, and they have special requirements, like being light and as rigid as possible [4,5] The increase in blade size engenders an increase in rotor and blade mass, which makes the requirements more severe for the main shaft, the tower and foundations that have to support the whole machine [6]. Act on spar cap layup parameters as a variable to achieve the objective and respect the constraints Authors of these papers [10,11] believe that by acting on spar caps one can reduce the blade mass and increase the edgewise stiffness. The experimental modal analysis (EMA) involve mechanical exciting to the structure using strikes with instrumented hammers depending on the system (Small -> lighter / Industrial -> heavier), and the vibration are measured using an accelerometer, or by acoustic / fluid systems [14,15,16]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
