Numerical modal analysis of a 850 KW wind turbine steel tower

Abstract

The study deals with the numerical analysis aspects that are necessary for identifying of modal parameters of the tower structure as the most important part of the horizontal axis wind turbine, which are basic for the dynamic response analysis. In the present study, the modal behavior of an actual 55-m-high steel tower of 850 KW wind turbine (GAMESA G52/850 model) is investigated by using three-dimensional (3D) Finite Element (FE) method. The model was used to identify natural frequencies, their corresponding mode shapes and mass participation ratios, and the suggestions to avoid resonance for tower structure under the action wind. The results indicate that there is a very good agreement with the fundamental vibration theory of Euler-Bernoulli beam with lamped masse in bending vibration modes. When the rotor of the wind turbine runs at the speed of less than or equal to 25.9 rpm it will not have resonant problems (stiff–stiff tower design). Furthermore, in case the rotor runs at the speed of between 25.9 and 30.8 rpm, the adequate controller is necessary in order to avoid the corresponding resonant susceptible area of the tower structure (soft–stiff tower design).

Modal Analysis of the Wind Turbine Planned to be Built in Mamurdağı Ground Conditions Using Finite Element Method

“…Researchers have conducted many study on new methods [15,12, 7, 14, 6] The author also refers to these studies about the wind towers structures made. Looking at the literature studies, the researchers carried out a different number of studies using the finite element method [20,1,16,4,8). Today, some authors have conducted various studies using FEM analysis of the structural response of tubular steel wind türbine with various design configurations.…”

“…Today, some authors have conducted various studies using FEM analysis of the structural response of tubular steel wind türbine with various design configurations. [8,26,19,13,4] 1…”