Seakeeping Performance Analysis of A 5 GT Fishing Vessel After Hatch Modification and Main Engine Replacement (Case Study : KM. Nelayan 2017-572)
Abstract
Fishing vessels may experience operational damage, as occurred with a 5 GT fishing vessel in the Lombok Strait. The vessel sustained significant damage, requiring modification of the hatch and replacement of the main engine. This incident was triggered by an accident, but the lack of information regarding the vessel's performance was a contributing factor. Therefore, a seakeeping analysis is necessary to prevent similar accidents from reoccurring. The strip theory method was applied with four variations of sea state conditions: light sea state (Hs = 1 m, Tp = 4.82 s), moderate sea state (Hs = 2 m, Tp = 6.11 s), rough sea state (Hs = 3 m, Tp = 7.69 s), and very rough sea state (Hs = 5 m, Tp = 11.63 s), using the JONSWAP spectrum and five wave directions. A comparative analysis between condition X0 (pre-modification) and X1 (post-modification) revealed no significant differences in heave and pitch motions. While roll responses were nearly identical, the roll motion in X1 occurred at a lower encounter frequency than in X0. A more detailed seakeeping performance assessment of X1 indicated that the roll and pitch motions complied with seakeeping criteria only at wave heights of 1 to 1.5 meters. Beyond this range, the vessel failed to meet operability criteria. Based on lateral and vertical acceleration thresholds, the vessel demonstrated reasonably good performance. Consequently, the vessel is recommended to operate under slight sea state conditions (Hs = 1-1.5 m).
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