SELECTION OF MOORING SPECIFICATION OF ELASTIC MOORING SYSTEM FOR VERY LARGE FLOATING STRUCTURES

Abstract

 The tension in elastic mooring lines is always present, which allows for stable positioning of a floating structure. But it has never been applied to VLFS over 500 m. In addition, there is no description of mooring design by elastic mooring line in technical standards and guidelines of mooring design.

 Therefore, in this study, a VLFS model moored by an elastic mooring system consisting of multiple elastic mooring lines was prepared, and the relationship between the restoring force characteristics of the elastic mooring system and the motion response characteristics of the VLFS was grasped. And, the length of the synthetic fiber rope that exhibits the most restoring performance as an elastic mooring system for each length of elastic mooring system was clarified by systematic calculation. The purpose of this study is to show a series of procedures that contribute to the design of elastic mooring systems that can select mooring system specifications from the applicable range of elongation rate of rubber rope, and number of rubber ropes that satisfies the allowable oscillation amplitude of VLFS.