Exprimental and Numerical Analysis of Tlp Floating Offshore Wind Turbine with one Tendon Failure

Helalat, Zeynab | 2019

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 52476 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Tabeshpour, Mohammad Reza
  7. Abstract:
  8. Offshore wind energy is widely recognized as a renewable energy source that has the potential as a global energy source. Although the use of coastal wind turbines has been successful, it has been challenged in terms of visual, acoustic and environmental impacts. In addition, in terms of technology, it is difficult to achieve high levels of energy from coastal wind resources due to low annual average speed; Therefore, the wind energy industry is trying to make more use of the deep-water wind resources. However, before developing these types of deep-water turbines, economic challenges and technical problems must be resolved. Mooring failure is one of the major issues in the design of offshore structures. The mooring design life must be appropriate with the life of the structure. The loss of a mooring line can increase the static and dynamic forces in rest of the mooring lines. In mooring failure, the platform's capacity is reduced and the structure must be survived under extreme conditions. Offshore wind turbines are subjected to complex loading of hydrodynamic and aerodynamic forces that must be coupled. In this paper, the experimental and numerical study of the aero-hydro-servo-elastic is investigated for the mooring failure and its transient response on the TLP platform for a 5 MW wind turbine with fast code the results are presented. Experiments were performed in the National Iranian Marine Laboratory. A comparison of results from physical and numerical simulation show that, the numerical result from FAST were very close to the results obtained from the experiment in pitch motion case, but in surge motion cases the numerical model failed to accurately predict the platform response. In the region of the surge natural frequency the numerical predictions substantially overestimate the experimental values. In the vesion of FAST used for this study did not additional viscous hydrodynamic damping to be deployed in the solution of platform motions, and it is presumed that this lack of viscous effects leads to the overestimate of the surge response at the peak of RAO. As a result of failure, the amplitude of the pitch motion changed dramatically, and the interruption of the dominant frequency of the structure that must be considered in the design processes
  9. Keywords:
  10. Offshore Renewable Energy ; Shore-Based Mooring ; Renewable Energy Resources ; Offshore Wind Turbine ; Tendon Failure

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