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Dynamic Analysis of Floating Offshore Wind Turbines

Imani, Hassan | 2015

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 47249 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Abbaspour Tehrani Fard, Madjid
  7. Abstract:
  8. Use of wind energy is always one of the aims of man during the times. He used this energy for wheat grinding and sometimes for marine transportations. During recent decades, technology development forced human to harness this energy and use that for electricity production by employing onshore wind turbines. However, the modern engineering employed different arms of engineering such as marine engineering, civil engineering, mechanical engineering and electrical engineering for designing and installation of offshore wind turbines. But, huge water depths in offshore regions make the fixed leg turbines to be unacceptable solution. So, the floating wind turbines with mooring lines which attach them to the sea bed are placed in the center of attention since recent decade. Vast and broad seas of Iran especially a huge potential of wind in Oman Gulf’s water have this sufficiency to be surveyed for design and installation of offshore wind turbines. For this reason, at the firs stage of this research, an offshore wind resource capability survey in Oman Gulf is done by SWAN wave model which is included the sea environmental loads such as wave, wind. In this step, due to lack of the measured wave parameters, a series of ECMWF wind data from Chahbahar region during 10 years (2001-2010) is imported to a SWAN model to access the wave characteristics. In addition, TurbSim code which is a stochastic, full-field, turbulent-wind simulator, has been used. TurbSim generates a rectangular grid which holds the wind data. The grid has to cover the entire rotor diameter to provide sufficient wind data to the airfoil. Then, three concepts for stabilizing the floating wind turbines are introduced. Afterward, a comprehensive analysis with three different turbulent intensity was performed for each model using FAST model (Fatigue, Aerodynamic, Structures and Turbulance) with Aerodyn and Hydrodyn module. For, FAST model provides unique capabilities in simulating floating platform wind turbines design, incorporating sophisticated hydrodynamic and mooring system module in a full coupled integrated simulation environment. In addition, by comparing the behaviour of structures subjected to environmental loads, a rational conclusion about concept selection for installation in a specific region at sea are done. Finally, according to this selection an offshore wind farm is designed by WindPro based on environmental condition of Chabahar Bay
  9. Keywords:
  10. Dynamic Response ; Offshore Wind Turbine ; Wind Energy ; Offshore Wind Energy ; Floating Offshore Wind Turbine ; Chabahar Bay ; Wave Loading

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