| Author | May Brany Aung |
| Call Number | AIT Thesis no.OTM-17-04 |
| Subject(s) | Deep-sea moorings
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| Note | A thesis submitted in partial fulfilment of the requirements for the degree of Master of Engineering in Offshore Technology and Management, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. OTM-17-04 |
| Abstract | The motions of a vessel when attached to mooring lines is analysed using a traditional method, the uncoupled analysis. In this method, the interaction between the vessel and the mooring lines are not incorporated where the mooring lines are modelled as added hydrostatic force of the vessel. Neglecting the dynamics of the mooring lines give s resu lts not as accurate as those from a coupled analysis. The coupled analysis is a modified form of uncoupled analysis in which the effect of the environmental loads on the mooring lines are included to an extent that allows reasonably complex analysis within the restraints of the time and computer resources for practical purposes. The aim of this study is to understand and identify the assumptions made in coupled and uncoupled analysis from the complete system of the vessel, mooring lines and the environment al forces. Also, the purposes of this study include comparing the results given from the uncoupled and coupled analysis, comparing the difference between the two analyses in different depths of water. Two models are developed for this study. The hull of an FPSO, internal turret - moored in water depths of 500 m and 1000 m is coupled with a different mooring system for each water depth. Uncoupled and coupled analysis are run for each case and the results compared. AQWA is used to solve the hydrodynamic problem . From the results, it is clear that the deviations of the results become more apparent in the model for 1000 m water depth compared to the model for 500 m. It can be conc luded that coupled effects are more prominent when the structures go into deeper water. It is recommended to study further as to decide when coupled analysis is necessary. |
| Year | 2017 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. OTM-17-04 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Offshore Technology and Management (OTM) |
| Chairperson(s) | Chui, Gregory L. F. |
| Examination Committee(s) | Bui V. Dao;Boswell, Laurence F. |
| Scholarship Donor(s) | GMSARN Scholarships |
| Degree | Thesis (M. Eng.) - Asian Institute of Technology, 2017 |