Technical Paper
Development of Freeboard Formula for Open Top Vessels in Indonesian Waterways
Tahun 2019
in this study, a minimum freeboard formula
was developed based on seakeeping performance for opentop
vessels. The open-top container vessel was selected as a
subject ship. To obtain a simplified formula of minimum
freeboard, the subject vessel is transformed to be 16 model
series which were constrained by displacement and block
coefficient. Seakeeping analysis was conducted to obtain
the motion responses for the transformed models. Based on
the results, the probability of green water (Ps) due to
coupled heave and pitch motions and probability of capsize (Pc) due to roll motion can be predicted. ITTC spectrum was
used as wave spectrum based on the Indonesian waters. It
was observed that the values of Pc in various wave height
were small and it confirmed that the situation of ship
capsizes did not occur. The value of Ps up to wave height
Hw = 7 m were small and the highest Ps in long-term
statistics occurred at Hw = 3.5 m. From those probabilities,
a formula of minimum freeboard was derived.
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