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The Effectiveness of Vibration Absorber on the Behavior of TLP Floating Offshore Wind Turbine in the Situation of Tendon Failure

Bahaelou Horeh, Erfan | 2023

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 55929 (08)
  4. University: Sharif University of Technology
  5. Department: Chemistry
  6. Advisor(s):
  7. Abstract:
  8. For many years, humans have been able to use wind energy to meet some of their needs. By improving science and the discovery of electricity as the mother of energy that is very easy to use, mankind thought of converting wind energy into electricity, so wind turbines were invented. Despite the wide spread of onshore wind turbines, their visual, acoustic and environmental negative effects still cause dissatisfaction among the residents of the areas where these turbines are installed. Also, the high wind speed in the seas compared to the land ares has caused the interest to use offshore wind turbines to increase in the past years. For this reason, an attempt has been made in this thesis to provide a comprehensive and complete introduction about offshore wind turbines, their types and their components. However, like any other technologies, the challenges of using this system must be predicted and solutions to solve these challenges must be provided. Considering the importance of reducing the vibrations caused by the combination of wind and wave loads in the structure and body of the wind turbine, investigating the effectiveness of various vibration absorbing systems such as the tuned mass damper is one of the important engineering and research topics in this field. Also, one of the challenges facing floating offshore wind turbines in deep and semi-deep waters is the breaking of the tendon, which occurs due to adverse weather conditions or due to fatigue. The failure of one of the tendons can increase the static and dynamic stresses in the remaining tendon lines, and this issue can cause the failure of other tendons and ultimately the failure of the entire structure. Therefore, it is very important to analyze the behavior of the floating offshore wind turbine when one of the tendons breaks. As a result of breaking the tendon, vibrations are created in the structure, which can cause serious damage to the structure if not analyzed and considering ways to reduce these vibrations. In this thesis, in addition to investigating the effect of the TMD (tuned mass damper) system in reducing the movements of the offshore wind turbine structure, tendon failure is investigated in two cases with and without the damper.
  9. Keywords:
  10. Offshore Wind Turbine ; Offshore Wind Energy ; Renewable Energy Resources ; Tension Leg Platform ; Marine Renewable Energy ; Pretensioned Tendons System ; Tendon Failure

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