3D Finite Volume model for free and forced vibrations computation in on-shore wind turbines

The paper presents an original approach combining both testing and numerical modeling to analyze the dynamic behavior of on-shore wind turbines under vibration stress. In the first section, experimental tests are performed to examine the structural response of the three main components of the turbine (blades, tower, and nacelle). Afterward, a robust 3-D Finite Volume model is developed using ANSYS for free and forced constraints calculation. The purpose of the developed tool is to model and interpret reliably the transient and static operational modes. The model is then validated using the Experimental Modal Analysis Method (EMAM). Thus, after setting the boundary conditions and the mesh elements size, the modal parameters were optimized to adjust the model. An excellent correlation between «calculations» and «measures» is obtained. The analysis is developed by the help of a powerful computer capable to execute many modes and present the distribution of equivalent stress for each mode. Hence, the vibrational comportments of the blades, the nacelle and the tower are analyzed.