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COBEM 2021
26th International Congress of Mechanical Engineering
SIMULATION AND ANALYSIS OF A HORIZONTAL AXIS WIND TURBINE SUBJECT TO A TURBULENT WIND FIELD
Submission Author:
Layse Freitas Boere de Moraes , SP , Brazil
Co-Authors:
Layse Freitas Boere de Moraes, Milton Dias Junior
Presenter: Layse Freitas Boere de Moraes
doi://10.26678/ABCM.COBEM2021.COB2021-0120
Abstract
The most effective strategy for reducing the production cost of wind power is to upscale the wind turbines. Since the decade of 1980, the wind industry has been through a period of intense and fast transitions related to this upscale process, which is intrinsically associated with the feasibility of production cost. The unavoidable upscale of wind turbines generates serious vibrations problems which need to be studied not only to ensure the safety of operations under these conditions, but also to provide higher power generation efficiency at low costs. This work aims to analyze the low frequency vibrations behavior using a wind turbine elastic model with 13 DOF, exposed to a two-dimensional velocity field. The three blades are modeled by Bernoulli-Euller Beam theory, the system was modeled using modal approach and the technical specifications are provided by NREL offshore 5-MW Baseline Wind Turbine. The model periodic time-dependence was analyzed through impulse tests and application of the Multi-Blade Coordinate Transformation, this transformation was applied to filter the PSD periodic frequency and to solve the eigenvalue problem. The SANDIA Method was used to model the 2D turbulent wind velocity field, and the difference between the point of view in the spectra (space frame or rotational blade frame) is analyzed. Lastly, the forced vibration behavior, in which the aerodynamic force was provided by the 2D turbulent wind velocity field was simulated. The expressive coupling between the model degrees of freedom as well as its periodic time dependence are shown by the PSD results. All simulations performed in this work present a good agreement with the literature for simulated cases and for field measures as well.
Keywords
wind energy, horizontal axis wind turbine, modal approach, MBC-Transformation, low frequency vibratory behavior
