Abstract
One of the most important parts of a wind turbine is a tower. There are various designs of the wind turbine towers, and they are most often made of steel pipes, lattice towers or concrete towers. In order to increase energy density to meet the growing electricity needs, larger wind turbine projects have been developed. Larger wind turbine towers can generate more electricity, but such large sizes also create higher costs in terms of development and maintenance. This research sets up a model of a wind turbine tower, where the load to the tower is calculated by its relation to the wind velocity. Analytical approach coupled with a finite element method (FEM) is used to analyse the distribution of tower stresses under these loads. The fatigue analysis of the column is performed using the load from its own weight, the weight of the housing and the distribution of the wind velocity. The effects of different loads are also compared. The results show that the main loads of the tower are the wind force acting on the area of ??rotation of the wind turbine blades and the moment caused by the uneven wind velocity. Construction is modelled using SolidWorks modelling package, where the analysis was performed using FEM in ANSYS software. As a result of the analysis, the stress distribution in the support was determined and compared with analytical calculations.
Highlights
The results show that the main loads of the tower are the wind force acting on the area of rotation of the wind turbine blades and the moment caused by the uneven wind velocity
There are many more advantages of wind energy and they are more obvious than disadvantages, the greatest disadvantage is that the entire process of using wind energy depends on an unpredictable constant, a presence of wind in a selected area
Based on the data and research conducted, a wind rose given in Fig. 1 was used to analyse the wind turbine tower at Bjelašnica site
Summary
Wind turbines convert energy from wind into electricity by rotating propeller-like blades around a rotor. The optimal wind for energy utilization is wind up to medium strength, without large oscillations and with the highest possible frequency [1] Taking these guidelines into account, mountainous region with highest average wind velocities in Bosnia and Herzegovina, which is region of Bjelašnica mountain, was chosen in this analysis. Based on the data and research conducted, a wind rose given in Fig. 1 was used to analyse the wind turbine tower at Bjelašnica site This area was chosen because it has sufficient wind velocity throughout the year for maximum energy utilization. Non-alloy structural grade steel S355 J2+N, which is widely used in engineering and construction industries, was selected as the material for the tower mantle This steel has a density of s = 7,600 kg/m3 and a yield strength y = 240 MPa. The basic loads to which the mechanical resistance and stability of the wind turbine are proven are divided into:. In this analysis, such coordinate system will be used in which the x-axis is located in the direction of the longitudinal axis of the column, the z-axis in the wind direction, while the y-axis is placed perpendicular to the other two axes to form the right Cartesian coordinate system
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