Abstract
The floating platform consisting of three interconnected semi-submersible modules deployed in shallow water with severe environmental conditions will be subject to very high environmental loads during storms and its position keeping will become a huge challenge. Therefore, it is important to investigate the hydrodynamic characteristics of the platform and design a robust mooring system to meet different demands during the service period of the platform. In this study, the hydrodynamic and motion analyses of the three-module semi-submersible platform were conducted by using both numerical simulation and experimental tests. In addition, a distinctive X-shaped mooring system was designed, which is characterized by relatively low stiffness in the direction of beam sea in which the environmental loads are the highest, and better load sharing among different mooring lines so that the extreme tension is curbed. Model tests were performed in a wave basin to acquire the platform motions and mooring tensions, and comparisons were made between the measurements and numerical predictions. The results of the study verify the feasibility of the three-module connected platform and its mooring system.
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