Improvement of ship hulls for comfort in passenger vessels

The objective of the work is to improve hulls from passenger vessels for comfort. The Overall Motion Sickness Index (OMSI), defined as the mean MSI value on the main deck, is used as the main parameter to be minimized, in order to obtain improved hulls for comfort. Two different passenger ships are submitted to various hull transformations in order to investigate their influence on passenger’s comfort. These are categorized into two groups: geometric and hull from transformations. The transformations are performed using MaxSurf Modeler developed by Bentley systems, based on the Lackenby Method. Each new hull is submitted to a seakeeping analysis that accounts for various heading angles and a specific operating scenario, described by the JONSWAP Spectrum. An in-house strip theory code CENTEC-SK, developed at CENTEC in Instituto Superior Tcnico, is used to predict heave, roll and pitch motions at various headings. This program is selected based on a comparison between a commercially available software and experimental results from S-175 containership, collected by ITTC. The improved hulls, selected based on the study of OMSI, are compared to their parent hulls regarding their RAOs plots. A similar comparison is performed regarding the absolute vertical accelerations, at strategic locations on the main deck. In order to assess the influence of comfort-oriented hull transformations, on other parameters of the seakeeping performance of a ship, the hull resistance is compared between each hull transformation. Finally, the improved hull forms are compared to their parent hulls regarding their operability index based on comfort criteria.

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