Abstract
Considering the complexity of the aerodynamic interaction between a non-homogeneous, nonstationary wind field and a wind turbine, one can easily establish that the constructive elements of the turbine will be exposed to dynamic loads, which will eventually lead to forced motion and particularly to forced vibrations. One of the most significant elements of every wind turbine is the tower of the generator. The tower is subjected to forced vibrations and transmits all dynamic loads that appear in the wind turbine. That is why a dynamic analysis of the tower is worth executing. In this research such an analysis is made considering the tower of the generator as Euler-Bernoulli beam structure and considering it as a Love-Kirchhoff shell structure.
Highlights
The purpose of this study is to analyse the dynamic behaviour of a tower of a wind turbine generator of high power such as the NREL5MW wind turbine
Considering the aerodynamic interaction between the wind and the whole wind turbine, the station is subjected to dynamic loads
The dynamic analysis can give the natural characteristics of the tower, can provide more knowledge on the forced vibrations and show a relation between wind speed and generated stresses
Summary
The purpose of this study is to analyse the dynamic behaviour of a tower of a wind turbine generator of high power such as the NREL5MW wind turbine. Considering the aerodynamic interaction between the wind and the whole wind turbine, the station is subjected to dynamic loads. These loads are transmitted to the ground through the tower of the turbine. The dynamic analysis can give the natural characteristics of the tower, can provide more knowledge on the forced vibrations and show a relation between wind speed and generated stresses. In our previous studies [1] a modified BEM theory was used to obtain the aerodynamic forces acting on the turbine, using a non-homogenous, non-stationary wind field model.
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