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Keywords = deckhouse height

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15 pages, 5230 KB  
Article
Numerical Investigations of Deckhouse Height to the Self-Righting Moment of the Patrol Boat
by Andi Trimulyono, Tuswan Tuswan, Haidar Farros Mawarizt Taqi, Parlindungan Manik, Good Rindo, Samuel Samuel, Ocid Mursid and Muhammad Iqbal
Designs 2024, 8(5), 86; https://doi.org/10.3390/designs8050086 - 27 Aug 2024
Cited by 1 | Viewed by 2012
Abstract
The design of patrol boats, especially in Indonesian waters with extreme sea conditions, requires good stability capabilities and self-righting moments. These conditions require patrol boats to have anti-capsized capabilities where, with these capabilities, the patrol boat can return to an upright position at [...] Read more.
The design of patrol boats, especially in Indonesian waters with extreme sea conditions, requires good stability capabilities and self-righting moments. These conditions require patrol boats to have anti-capsized capabilities where, with these capabilities, the patrol boat can return to an upright position at extreme heeling angles. This study investigates how changing the center of gravity (CoG) due to the deckhouse height factor improves self-righting moment capabilities. Four different deckhouse heights are examined to find the optimal self-righting roll moment, with a deckhouse height in the 2.01–2.31 m range. In addition, the presence of the self-righting roll moment is also validated by the computational fluid dynamics (CFD) method using three different mesh sizes. The height of the deckhouse can significantly influence the ship’s stability. The initial investigation shows ships with minimum deckhouse heights of 2.06 m have positive righting lever arms at 170° and are classified as anti-capsized ships. It has been discovered that buoyancy and the center of gravity are crucial variables in obtaining the self-righting moment. The deckhouse’s height increases the stability of the ship’s righting arm by enhancing the metacenter point. The findings demonstrate that more excellent stability is achieved with a larger deckhouse height. Full article
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16 pages, 7683 KB  
Article
Design of Anti-Capsize Ship for Patrol Vessel with the Self-Righting Moment
by Andi Trimulyono, Moh. Afroh Fuadi, Ahmad Fauzan Zakki, Ocid Mursid and Muhammad Iqbal
J. Mar. Sci. Eng. 2023, 11(1), 133; https://doi.org/10.3390/jmse11010133 - 6 Jan 2023
Cited by 8 | Viewed by 5108
Abstract
The patrol boat is one of the critical aspects for archipelago countries, such as Indonesia, to supervise and maintain the sea border. Due to rough sea conditions, the patrol boat could lose its stability due to the loss of a self-righting roll moment [...] Read more.
The patrol boat is one of the critical aspects for archipelago countries, such as Indonesia, to supervise and maintain the sea border. Due to rough sea conditions, the patrol boat could lose its stability due to the loss of a self-righting roll moment in severe waves. One of the most challenging aspects is to ensure the sufficient stability of the patrol boat during rough conditions. Another challenge is to design a boat that has a self-righting moment during rolling in extreme conditions. This paper examines the design of an anti-capsize ship by improving the self-righting moment with different deck houses height. The rough condition is described when the boat experiences a roll angle of 170°. The principal dimensions of the patrol boat, i.e., Lpp, B, H, T, are 13.0 m, 4.2 m, 2.19 m, and 1.15 m, respectively. Four different deck house heights are compared to obtain the best self-righting roll moment with a height increment of 0.1 m. The physical model is implemented with ship model 1:27.4. In addition, computational fluid dynamics (CFD) is also used to support the proof of the existence of the self-righting roll moment. It is revealed that the center of gravity and buoyancy are essential parameters to acquire the self-righting moment. The height of the deckhouse improves the center of the metacenter, which influences the righting arm of ship stability. The results show that our ship design has a self-righting moment during heel at 180°. Full article
(This article belongs to the Section Ocean Engineering)
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