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Stability and Dynamic Response of Tension Leg Platform in Damaged Condition (Tendon Removed)

Mahmoodi, Mohammad Reza | 2017

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 49603 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Tabeshpour, Mohammad Reza
  7. Abstract:
  8. The tension leg platform is one of the compliant structures which are generally utilized for deep water oil explorations. With respect to the horizontal degrees of freedom, it behaves like a floating structure moored by vertical tethers which are pretension due to the excess buoyancy of the platform, whereas with respect to vertical degrees of freedom it is stiff and resembles a fixed structure and is not allowed to float freely. A sudden disconnection of a tendon causes a change of stiffness and unbalance of forces and moments of the total system. The objective of this study is experimental and numerical investigation on behavior of ISSC TLP. Experiments were performed in the National Iranian Marine Laboratory. Surge and heave response amplitude operators were obtained from experiments and it is seen that the results from numerical study have good agreements with those of model tests. It is found that the mean heave position moved to a permanent higher level after losing one tendon. It is also seen that the tension of the neighboring columns can be increased while the tension on the diagonal column tendons decreased. The effects of different incident wave angles on response amplitude operators were discussed. Eventually, transient effects of tendon disconnection due to extreme wave according to API RP 2T were analyzed
  9. Keywords:
  10. Dynamic Response ; Numerical Study ; Model Test ; Response Amplitude Operator (RAO) ; Tension Leg Platform ; Tendon Disconnection

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