Abstract

In this study, the full coupled effect between a lifted object and vessel motions is considered in both time and frequency domains for a typical construction vessel, Lewek Constellation (LCO). Two numerical models with and without effect of the lifted weight are simulated using the Ultramarine-MOSES software, and the numerical results from these models are compared to evaluate the dynamic effect of the lifted object on the vessel motions. Parametric studies are also investigated, considering different headings, significant wave heights, lifted weights and lifting positions. Dynamic amplification factors (DAF) obtained from sling forces of the rigging system are compared with the recommended values in the DNV practice code. This study gives a better understanding of the coupled lifted object - vessel motion system and may be useful for marginal lifting cases.

Keywords:
peak period, gyration, time history, operation, interaction, time domain, construction vessel, vessel motion, beam sea condition, wave height
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2014. International Society of Offshore and Polar Engineers
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