Size Optimization of Foil-shaped Center Bulb on Catamaran Hull Form to Reduce Resistance

Eko Hadi, Muhammad Iqbal, Gana Pranamya

2019

Abstract

The interference of resistance between the two catamaran hulls is a very popular topic to discuss. Errors in designing hull form and determining the distance between the hull will result in a large amount of interference that causes the resistance of the catamaran increased. Some researchers try to reduce the resistance of catamaran due to interference such as changing the shape of the demihull, giving a bulbous bow, and adding a center bulb. The idea to use center bulb on catamarans is still relatively new and still requires a lot of studies. Therefore, in this study the elliptical center bulb will be replaced with a foil-shaped center bulb. The purpose of this study was to obtain the optimal length (X1) and diameter (X2) foil-shaped centrebulb on the NPL hull catamaran scale model with Fr 0.7 using Response Surface Method (RSM). The optimal size of foil-shaped center bulb is determined by the size that the most makes of ship wave resistance (Rw) to a minimum. The results of the regression equation in Order 1 are Rw= -0.168¬X1+0.378X2+14.862 and the results of the regression equation in Order 2 are Rw= -0.020239X1+0.061318X2+〖0.201557(X1)〗^2+〖0.261325(X2)〗^2+0.015(X1X2)+13.34806. Optimal center bulb size is obtained at a length of 103.78 mm and a diameter of 26.30 mm with a wave resistance value of 13.23 N. The center bulb size can reduce wave resistance by 11.74% from the initial center bulb model and reduce 4.72% compared to not using a center bulb.

Paper Citation

in Harvard Style

Hadi E., Iqbal M. and Pranamya G. (2019). Size Optimization of Foil-shaped Center Bulb on Catamaran Hull Form to Reduce Resistance. In Proceedings of the 7th International Seminar on Ocean and Coastal Engineering, Environmental and Natural Disaster Management - Volume 1: ISOCEEN, ISBN 978-989-758-516-6, pages 67-75. DOI: 10.5220/0010055600670075

in Bibtex Style

@conference{isoceen19,
author={Eko Hadi and Muhammad Iqbal and Gana Pranamya},
title={Size Optimization of Foil-shaped Center Bulb on Catamaran Hull Form to Reduce Resistance},
booktitle={Proceedings of the 7th International Seminar on Ocean and Coastal Engineering, Environmental and Natural Disaster Management - Volume 1: ISOCEEN,},
year={2019},
pages={67-75},
publisher={SciTePress},
organization={INSTICC},
doi={10.5220/0010055600670075},
isbn={978-989-758-516-6},
}

in EndNote Style

TY - CONF

JO - Proceedings of the 7th International Seminar on Ocean and Coastal Engineering, Environmental and Natural Disaster Management - Volume 1: ISOCEEN,
TI - Size Optimization of Foil-shaped Center Bulb on Catamaran Hull Form to Reduce Resistance
SN - 978-989-758-516-6
AU - Hadi E.
AU - Iqbal M.
AU - Pranamya G.
PY - 2019
SP - 67
EP - 75
DO - 10.5220/0010055600670075