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Vibration Control of Tension Leg Platfoem under Dynamic Loads

Malayjerdi, Ebrahim | 2015

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 47484 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Tabeshpour, Mohammad Reza
  7. Abstract:
  8. TLP is membership of compliant structures. In these platforms buoyancy is more than the weight and pretension compensates extra buoyancy. TLP is consisting of pontoons, columns and a deck. TLP is vertically moored with tendons and tendons extend from under the columns to sea bed. Marine structures vibrate due to applying environmental loads such as wind, waves, currents, earthquakes. Therefore vibration control of TLP is very important problem not only from motion aspect but also from design and fatigue point of view. In this thesis, passive vibration control of TLP with different TMDs are investigated. In first part, introduction of tension leg platforms, types of control mechanisms and previous studies about time domain and frequency domain, design aspects, fatigue, damage tendons, reliability and vibration control of marine structures have been studied. In second part analysis of waves in time and frequency domains and spectral analysis of wave force for marine structures is conducted. In third part, dynamic equations of TLP in regular waves are derived by BEM method. Diagram of RAO for motions of TLP is obtained. Conceptual discussion on the RAO of TLP by mathematical and graphical is studied. Practical analysis of TLP in frequency domain by RAO is done. Portion of pitch motion in heave response of TLP in corner of deck have been investigated. Conceptual discussion on the heave components in coupling heave with surge is studied. In fourth part, Passive control of heave motion of TLP with single verticaal TMD and Pendulum TMD with and without viscose damper have been studied. Then deals with the simultaneous passive control of the heave and pitch motions by adding two vertical tuned mass dampers in the corners of the platform. Passive control of surge motion is investigated using one and double horizontal TMD as well
  9. Keywords:
  10. Tension Leg Platform ; Spectral Analysis ; Passive Control ; Response Amplitude Operator (RAO) ; Tuned Mass Damper (TMD) ; Vibration Control ; Dynamic Loads ; Motions Coupling

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