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Nonlinear Vibration Analysis of Non-Uniform Beam in two Lateral Directions by Multiple Scales Method: Application in Wind Turbine

Karimi, Behnam | 2018

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 50644 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Moradi, Hamed
  7. Abstract:
  8. Environmental issues and energy crisis have led the world attention to the renewable energies; especially wind power, since they have low cost and high reliability. One of the most challenging areas of studying for wind power is to increase the capacity of wind turbines. As a result, over the years, wind turbines have got progressively larger. Vibration is one of the problems that reduces the life and efficiency of wind turbines; and the growing size of the blades has worsen this problem due to the importance of nonlinear effects in large scale wind turbines. Researchers have been constantly working on this issue in order to make the wind turbines more efficient. In this research, a nonlinear dynamic model of a wind turbine blade is developed using Hamilton’s principle. This model is then simplified to three modal equations, two in flapwise direction and one in edgewise direction. These equations are then solved analytically using one of the perturbation methods, in free and forced vibration conditions. In free vibration, the internal resonance is investigated and the transfer of energy between the modes is shown. In forced vibration, the effects of different structural and aerodynamic parameters on the frequency response of the blade are studied. Moreover, different nonlinear phenomena such as multivaluedness and jump are investigated in this study
  9. Keywords:
  10. Wind Turbine ; Dynamic Response ; Perturbation Method ; Nonlinear Vibration ; Multiscale Method ; Nonlinear Phenomenas

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