محسن مهرمطلق

Wind energy is one of the most hopeful renewable energy sources that is also growing. The wind turbine tower supports the complete wind turbine system, and its damage may cause catastrophic failure of the wind turbine. However, the background to the study of the health monitoring of the wind turbine tower against its mechanical installations is insignificant. Besides, no comprehensive research has been conducted on the health monitoring of the tower with soil-structure interaction included. In this article, the extensive analysis of the multilevel 2D wavelet decomposition approach using orthogonal wavelets and soil-structure interaction is performed numerically. The established finite element model is calibrated and verified with the NREL 5-MW reference onshore wind turbine. Then, while defining several damage scenarios, the 3-dimensional modes of the finite element model of the damaged structure were investigated using the proposed method. The findings imply that the quality of the damage detection in the soil-structure interaction models has increased, generally.

Wind has been one of the cleanest sources of energy. The tendency to use wind turbines has been a growing trend in the world in recent decades. The size and capacity of wind turbines are increasing rapidly in order to obtain more wind energy. Statistics show that more giant turbines are more broken down and require more maintenance. The goal of wind farm owners is to monitor work to reduce downtime and increase the efficiency of each wind turbine. The wind turbine tower carries the entire wind turbine and is the second-largest cost of the wind turbine. Damage to the tower can endanger the entire wind turbine and cause extensive damage. However, the background to the study of the health monitoring of the wind turbine tower against its mechanical installations is insignificant. Besides, no comprehensive research has been conducted on the health monitoring of the tower with soil-structure interaction included. In this study, biorthogonal wavelets were used to process the mode shape of the damaged tower. The foundation is a square concrete foundation 20 m × 20 m and 1 m in depth. Two different soils, a normally consolidated clay and dense sand, are considered. Eighteen failure scenarios were defined. The results of this study indicate that the use of side-to-side mode shapes of the tower has a tangible advantage over its fore-aft mode shapes for detecting the failure. Considering the desirable effect of soil-structure interaction on damage detection, it is necessary to examine this effect in the analysis.