Tese: A deterministic and stochastic analysis of wind turbines
Aluno(a) : João Antonio Pires AlvesOrientador(a): Rubens Sampaio
Área de Concentração: Mecânica Aplicada
Data: 23/03/2016
Link para tese/dissertação: http://doi.org/10.17771/PUCRio.acad.29870
Resumo: This thesis presents a dynamic analysis of a three-blade wind turbine with tubular cross section under deterministic and stochastic concentrated and distributed loads, including those caused by wind and by sea currents. Variations in the soil conditions are allowed, being modeled as linear axial and torsional springs installed at the base of the tower. The random loading is due to the action of the wind on the turbine blades. The symmetries involved allow the tower to be modeled as having four separated and superimposed structural behaviors: a beaming spatial (lateral) motion, a shaft (torsional) motion and a bar (axial) motion. Finite elements are used for approximating the dynamic and then a reduced model is constructed using a basis of finite dimension of the structure eigenvectors. The other turbine components, namely, the nacelle, the shaft and the blades are modeled as rigid bodies whose links are imposed by constraint functions. An algorithm based on Newmark method was developed to integrate the system of equations in time. Velocities, accelerations, forces, and torques, as well as the resulting stresses are obtained for several configurations.