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Conceptual study on dynamic response of semi-submersible

Tabeshpour, M. R ; Sharif University of Technology | 2021

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  1. Type of Document: Article
  2. DOI: 10.1680/jmaen.2020.4
  3. Publisher: ICE Publishing , 2021
  4. Abstract:
  5. Hydrodynamic analysis of semi-submersible offshore structures has been the topic of many researches performed numerically and experimentally in the past. In this paper, the effect of structure alignment and mooring lines on dynamic behaviour of semi-submersible platforms has been taken into account. The contribution of pitch and roll in heave motion of side points is also investigated. Mooring lines are connected to semi-submersible at sides and therefore total displacement of side points is related to total displacement of mooring lines and total tension as well. A three dimensional boundary element model of Amirkabir platform in Caspian Sea is implemented using boundary element method (BEM) and the resulting RAOs are obtained. A conceptual study on RAOs (Response Amplitude Operators) is conducted showing that structure alignment with respect to wave direction becomes highly important in a range of wave periods. Also, in surge and sway, the effect of mooring lines becomes significant in particular ranges of wave period. Contributions of roll and pitch on side points of semi-submersible are also considerable in a range of periods. © 2021 ICE Publishing: All rights reserved
  6. Keywords:
  7. Boundary element method ; Dynamic response ; Mooring ; Mooring cables ; Offshore oil well production ; Sailing vessels ; Submersibles ; Conceptual study ; Dynamic behaviors ; Heave motion ; Heave-pitch coupling ; Hydrodynamic analysis ; Mooring line ; ON dynamics ; Response amplitude operator ; Structure alignment ; Wave period ; Semisubmersibles
  8. Source: Proceedings of the Institution of Civil Engineers: Maritime Engineering ; 2021 ; 17417597 (ISSN)
  9. URL: https://www.icevirtuallibrary.com/doi/abs/10.1680/jmaen.2020.4