Preliminary Study on Stability Parameters of Semi-Displacement Ships

Abstract:

Semi-displacement passenger ships operate at the speed range of 19 to 23 knots or Froude number Fn of 0.50 to 0.75. Those ships need higher engine power to maintain their speeds. The efforts should be made to minimize their higher engine powers. Most experts worked to minimize the engine power for most merchant ships. In their works, the initial metacentric (GM_O) at departure condition was taken as constraint to represent stability parameters. However, this is not a general case for semi-displacement passenger ships. In this study, a parent semi-displacement passenger was designed and modified. Stability parameters were computed and evaluated as required by the rules IMO-HSC. In addition, one existing high speed passenger ship was evaluated for stability evaluation as reference also. It was found that the stability parameters at large angles of inclination such as: weather criterion, angle of GZ_max and others are more critical compared to GM₀. Also, the stability parameters when ship is at arrival condition are more critical compared to those at departure condition. The study resumed that the application of criterion GM₀ ≥ 0.15 m at optimization process of semi-displacement passenger ships should be considered again for the future.

• Periodical: Applied Mechanics and Materials (Volume 874)
• Pages: 105-113
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.874.105
• Online since: January 2018
• Authors: Wolter R. Hetharia*
• Keywords: Semi-Displacement Ships, Stability Parameters

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