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Investigation of Performance and Aeroelastic Characteristics of Wind Turbine Blades Based on Flexible Multibody Dynamics Model

Sekandari, Mahmoud | 2015

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 47698 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Ebrahimi, Abbas
  7. Abstract:
  8. Aeroelasticity analysis and prediction of wind turbines sturcture deformations are fundamental parts in their design. Increasing the size of wind turbine blades and development of Mega-watt sized wind turbines have enhanced the importance of these studies. In this study, the aeroelasticity analysis of a wind turbine blade has been done based on flexible multibody dynamics method. For this purpose, the modal approach has been used for modeling blade structure which has been considered as a flexible beam with bending and torsion degrees of freedom. The unsteady vortex lattice method has been used to calculate aerodynamic loads in order to combine with wind turbine blade structure model. Using kinetic and potential energy relations of flexible blade and virtual work of external forces, the mass and stiffness matrices and vector of generalized external forces have been obtained. The lagrangian approach has been utilized in driving the governing dynamic equations and this nonlinear system of equations have been solved in time domain. After verification of structure and aerodynamic models by using standard samples, results have been compared with reported data of standard 5 MW NREL wind turbine for validation. At the end, this study has resulted in achievement of a useful tool to evaluate flexibility of horizontal-axis wind turbine blade at different aerodynamic states. Time response including elastic deformations of blade and rotor power are the most important results of this study. Investigation of wind turbine reaction to sudden change in wind speed and its direction is another part of the results. The results of this study show that the wind turbine control system failure can cause a lot of hurm to the turbine
  9. Keywords:
  10. Aerodynamics ; Vortex Lattice Method ; Aeroelasticity ; Wind Turbine ; Turbine Blades ; Flexible Multibody Dynamics

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