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Investigation and Analysis of Response Behavior of Tension Leg Platform under Impulse and Limit Loads (In order to Investigate the Phenomenon of Tendon Disconnection)

Belvasi, Navid | 2018

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 51162 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Tabeshpour, Mohammad Reza
  7. Abstract:
  8. Given the increasing development of exploitation of deepwater oil and gas resources, access to realistic solutions for analyzing and designing offshore platforms is a major factor in facilitating the exploitation of oil and gas resources in these areas. There is a huge amount of oil reservoirs in deep water beds, and Tension leg platform (TLP), as a compliant structure, are suitable for oil extraction in deep water.The advantage of using these platforms is the ability to rotate and move at a rate of rotational and transient freedom. Surge motion The TLP is a 120-second long period; In high-amplitude and low period waves, the platform faces a tendon rupture due to high waves forces and bad weather conditions. These conditions are heavier and more prevalent in the harsh seas, such as the Gulf of Mexico and the North Sea.In principle, due to the momentary instability of the structure and the sudden moments caused during the tendon rupture, it is very important for analysis because the lack of examination of these cases due to the long duration of the wave power leads to unsustainability and inefficiency of the platform in inappropriate marine conditions.This thesis first explores the irregular waves of the sea and provides a suitable method for modeling the artificial time history of the sea elevations, the relations and conditions necessary for modeling this random process, as well as creating a scientific and computational procedure for modeling the impact load equivalent to This history has been devoted to examining, in the end, the behavior of the pivotal platform under these impact loads, which have caused factors such as tandem failure resulting from the sudden surges or pitch movements caused by these shock loads. The entire process is developed in a coherent way. Finally, a comparison between these impulses has been made, and the most suitable impulse for use in this method is specified
  9. Keywords:
  10. Tension Leg Platform ; Tendonitis Injuries ; Impact Loads ; Sea Irregular Wave ; Artificial Time History ; Sea Equivalent Impulse Load

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