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All Journal KAPAL Jurnal Ilmu Pengetahuan dan Teknologi Kelautan The Indonesian Journal of Naval Architecture Jurnal Transportasi Prosiding Forum Studi Transportasi Antar Perguruan Tinggi Makara Journal of Technology
Andi Haris Muhammad
Department of Naval Architects, Faculty of Engineering, Hasanuddin University, Makassar, Indonesia 990245)
Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Electrical & Electronics Engineering Engineering Materials Science & Nanotechnology Mechanical Engineering Transportation Other

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Journal : KAPAL Jurnal Ilmu Pengetahuan dan Teknologi Kelautan

 1 
Pengaruh Sudut Kemiringan dan Jarak antar Daun Kemudi Terhadap Kinerja Maneuvering KMP Bontoharu Muhammad, Andi Haris; Paroka, Daeng; Rahman, Sabaruddin; Firmansyah, Mohammad Rizal
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 16, No 3 (2019): Oktober
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1278.253 KB) | DOI: 10.14710/kapal.v16i3.24946

Abstract

Kapal ferry ro-ro sesuai fungsinya sebagai kapal penyeberangan penumpang dan kendaraan antar pulau memiliki karakteritik yang berbeda dibanding kapal niaga pada umumnya, khususnya pengunaan sistem kemudi ganda dengan rasio jarak antar daun kemudi yang relatip besar, hal ini sangat berdampak terhadap kemampuan olah gerak kapal.Penelitian ini bertujuan untuk menganalisiskemampuan maneuvering kapal ferry melalui pengaturan sudut kemiringan dan jarak antar daun kemudi. Program MATLAB-Simulink digunakan dalam simulasi turning circle dan zig-zag maneuvering. Program simulasi telah dikembangkan dengan konsep time domain simulation berdasarkan persamaan model matematika pergerakan kapal pada 3-DOF (Degres of Freedom) yang meliputi persamaan komponen lambung, propeler dan daun kemudi beserta koefisien hidrodinamaka didalamnya. Hasil penelitian menujukan bahwa seiring dengan bertambahnyasudut kemiringan daun kemudi dapat meningkatkan kemampuan turning circle kapal, namun sebaliknya pada gerak zig-zag maneuvering. Selanjutnya dengan bertambahnya jarak antar daun kemudi dapat meningkatkan kemampuan baik turning circle dan zig-zag maneuvering, namun dengan momen daun kemudi yang relative besar maka hal ini dapat membahayakan kapal.
Estimation of Effective Wave Slope Coefficient of Ships with Large Breadth and Draught Ratio Paroka, Daeng; Muhammad, Andi Haris; Rahman, Sabaruddin
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 17, No 1 (2020): February
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2729.505 KB) | DOI: 10.14710/kapal.v17i1.28399

Abstract

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.
Co-Authors Daeng Paroka Firmansyah, Mohammad Rizal Handayani - Kamil, Muhammad Fahmi Mansyur Hasbullah Muhammad Alham Djabbar Nidia Yuniarsih Sabaruddin Rahman Syamsul Asri