ANÁLISE DINÂMICA DE AEROGERADORES OFFSHORE COM FUNDAÇÃO DO TIPO MONOPILAR

Resumo

The offshore wind power generation has shown a considerable growth over the last few ye-
ars. The wind power potential of the Brazilian Exclusive Economic Zone (ZEE) is significant, with a

continental shelf of low depth and extremely favourable wind speed in the Northeast region. Offshore

wind power exploration appears as an alternative for the expansion of the national primary energy sour-
ces. The monopile type represents approximately 80% of the global foundation solutions for Offshore

Wind Turbines (OWT). In general, OWTs exhibit high flexibility and similar behaviour to an inverted
pendulum. They are constantly subjected to the dynamic actions of wind forces, which are combined

with other loads, such as waves, sea currents, earthquakes. This work presents procedures for the one-
way dynamic analysis of monopile OWTs, where aerodynamic loads are obtained by the Blade Element

Momentum (BEM) theory and the structural dynamic simulation is performed in a one-dimensional mo-
del according to the Finite Element Method (FEM). An integration between aerodynamic loading and

the structural module is performed with the aid of MATLAB. The soil-structure interaction is idealized
by means of four simplified models: fully fixed, distributed springs, apparent fixity length and coupled

springs. Several results are presented for the NREL 5MW reference turbine and validated by robust mo-
del solutions available in literature. The results indicate the efficiency of the developed routines on the

characterization of the transient wind action on the rotor and its possible use for the dynamic analysis of
wind turbines on sea for different environmental conditions.