Estimation of Effective Wave Slope Coefficient of Ships with Large Breadth and Draught Ratio

Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan

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Field Value
 
Title Estimation of Effective Wave Slope Coefficient of Ships with Large Breadth and Draught Ratio
 
Creator Paroka, Daeng
Muhammad, Andi Haris
Rahman, Sabaruddin
 
Subject
ship stability; weather criteria; wave slope coefficient; ro-ro ferry

 
Description One of parameters to estimate heel angle of a ship in beam seas is effective wave slope coefficient. In the weather criterion of IMO, the effective wave slope coefficient is determined as function of ratio between distance of center of gravity from the sea surface and the ship draught. The others methods could be used to estimate the effective wave slope coefficient are simplified strip theory and model experiment. A ship with shallow draught and large vertical center of gravity can have an effective wave slope coefficient larger than 1.0 if the coefficient is calculated by using the formulae of weather criterion. Therefore, an alternative method to estimate the coefficient is necessary when it is applied to ships with geometry characteristics different with those used to develop the formulae. This research conducts to estimate the effective wave slope coefficient using three different methods, namely the formulae of weather criterion, the simplified strip theory and model experiment. Results of the three methods may provide enough evidence about suitable method to estimate the effective wave slope coefficient of ships with breadth and draught ratio larger than 3.5 like the Indonesian ro-ro ferries. Results and discussion show that the effective wave slope coefficient obtained by using the formulae of weather criterion is larger compared to that obtained by using the simplified strip theory and the model experiment. Here, the result of simplified strip theory for wave frequency the same as the roll natural frequency of subject ship is similar with the result of model experiment. This results show that the simplified strip theory can be used as an alternative method to determine the effective wave slope of a ship with breadth and draught ratio larger than 3.5 if the result of model experiment does not available.
 
Publisher Department of Naval Architecture - Diponegoro University
 
Contributor
 
Date 2020-02-29
 
Type info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion


 
Format application/pdf
 
Identifier https://ejournal.undip.ac.id/index.php/kapal/article/view/28399
10.14710/kapal.v17i1.28399
 
Source Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan; Vol 17, No 1 (2020): February; 40-49
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan; Vol 17, No 1 (2020): February; 40-49
2301-9069
1829-8370
 
Language eng
 
Relation https://ejournal.undip.ac.id/index.php/kapal/article/view/28399/16705
 
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Rights Copyright (c) 2020 Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan
https://creativecommons.org/licenses/by-sa/4.0/
 

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