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The author proposed "vertically movable tension leg mooring system" in the previous paper for the purpose that an offshore floating body subject to comparatively large static horizontal loads for its scale is moored so that the occupied plane area of the mooring system may become as small as possible. And its static mooring characteristics were discussed with model calculations to demonstrate the advantages compared with the conventional tension leg mooring or the catenary mooring. In this paper, the response of the floating body and the mooring system to waves is studied to investigate the dynamic effect of the massive template hung from the floating body in the proposed system. As a result, it is demonstrated that the dynamic effect of the mooring system on the wave exciting motions of the floating body is quite small when the system is properly designed. And it is found that the tension fluctuation could generate the slack and taut repetition in the windward side mooring chain which connects the sea floor anchor and the template hung from the floating body. Finally, some guidelines to reduce such phenomenon are shown based on the parametric case study.

Dynamic Response of Vertically Movable Tension Leg Mooring System to Waves in Frequency Domain