|Title :||COMPARATIVE ANALYSIS OF MOORING SYSTEMS OF FLOATING CYLINDRICAL STRUCTURE IN TIME DOMAIN|
|Author :||Vina, Widya Lestari|
|Date of defense :||2018|
|Advisor(s) :||Otto, Christoph
|Committee's member(s) :||Paschen, Mathias
|Number of pages :||97|
|Discipline(s) :||Engineering, computing & technology > Civil engineering|
|Target public :||Researchers|
Professionals of domain
|Institution(s) :||Université de Liège, Liège, Belgique|
|Degree:||Master de spécialisation en construction navale|
|Faculty:||Master thesis of the Faculté des Sciences appliquées|
[en] Mooring design has an essential influence on stability, seakeeping and fatigue loads on offshore structures. It has thus become state of the art to include detailed mooring analysis and optimisation as a crucial part of the design process of moored systems. In this context it is common to carry out large-scale time domain simulations for a number of well-defined loadcases, which are usually defined by classification societies such as e.g. DNV-GL. The analysis study will perform the comparison of different types of mooring for an exemplary partially submerged cylindrical floating structure. The goal of analysis is to compare resulting loads in time domain using a fully coupled dynamic analysis of the mooring and floater. The analysis is using and extending approaches recently developed at the chair of ocean engineering (OCN-SIM Flex Software, www.ocnacademy.org). In order to facilitate a comparison, an extended hydrodynamic loads equation of the floating structure is implemented and verified with mathematical model in OCN-SIM Flex using the Airy wave theory with single unidirectional, harmonic excitation. Dynamic tensioning or slackening by winches shall not be considered. Moreover, the dynamic behaviour of the structure can be characterized based on the results of the time-domain simulations. Thus, for instance transfer functions can be determined by performing a frequency analysis of the simulated time-domain response to harmonic wave excitation.
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