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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 47403 (08)
- University: Sharif University of Technology
- Department: Mechanical Engineering
- Advisor(s): Tabeshpour, Mohammad Reza; Mehdigholi, Hamid
- Abstract:
- Tension leg platforms (TLPs) are well-known structures for oil exploitation in deep water. Tethers are one of the most important component of these structures. Nonlinear response of TLP tethers under the combined action of wave and current was investigated in the present issue. Both the quadratic damping due to fluid resistance and parametric excitation due to top tension variations are included in the mathematical model. Only the vortex-induced transverse oscillations under lock on conditions were examined. A fourth order runge-kutta method was used to solve the equations of motion of tendons. The effects of surge motion coupling on the heave motion, the effects of tendon's oscillation on dynamic response of surge motion and the effects of the drag and lift coefficients and the frequencies of the vortex shedding and parametric excitations have also been investigated. Stability analysis of the nonlinear system have been presented in a separate section.It is shown that the effect of surge motion coupling on the heave motion is very important in large displacement of surge motion. It is also found when the effect of tethers oscillation is considered, the angle of tethers with vertical line at the connection of tethers by hull becomes smaller
- Keywords:
- Tension Leg Platform ; Dynamic Stability ; Parametric Excitation ; Vortex-Induced Vibration (VIV) ; Vertical Harmonic Load ; Tendon ; Tendon Vibration
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