Department of Naval Architects, Faculty of Engineering, Hasanuddin University, Makassar, Indonesia 990245)

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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

#### 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.
DESAIN FREEBOARD MINIMUM TERHADAP KESELAMATAN DAN PENGURANGAN BIAYA OPERASIONAL KAPAL PERIKANAN 30 GT DI PERAIRAN SULAWESI (STUDI KASUS KM INKA MINA 759) Muhammad, Andi Haris; Baharuddin, .; Hasan, Hasnawiya
Jurnal Ilmu dan Teknologi Kelautan Tropis Vol. 10 No. 2 (2018): Jurnal Ilmu dan Teknologi Kelautan Tropis
Publisher : Department of Marine Science and Technology, Faculty of Fisheries and Marine Science, IPB University

#### Abstract

Kapal perikanan umumnya dirancang dengan misi khusus untuk menemukan, menangkap, dan mengawetkan ikan, sementara itu kapal harus memiliki tingkat keselamatan yang baik, biaya operasional yang rendah serta ramah lingkungan. Penelitian ini bertujuan untuk meningkatkan tingkat keselamatan dan pengurangan biaya operasional kapal perikanan 30 GT melalui desain freeboard minimum. Paket program Maxsurf telah digunakan dalam pemodelan dimensi, desain bentuk kasko, prediksi stabilitas dan resistensi pada 4 (empat) model kasko yang dianalisis (K1, K2, K3 dan K4). Hasil penelitian menunjukkan bahwa bentuk kasko K2 dengan rasio dimensi utama lebih lebar (L/B=4,98; B/D=3,26; B/T=4,80; D/T=1,47) memiliki tingkat stabilitas yang lebih baik dibandingkan 3 (tiga) model kasko lainnya (K1, K3 dan K4), sementara pengurangan nilai resistensi tertinggi ditunjukkan oleh model bentuk kasko K3 dengan rasio dimensi utama lebih ramping (L/B=6,43; B/D=2,78; B/T=4,09; D/T=1,47). Secara umum, keempat model bentuk kasko yang dianalisis layak dioperasikan sesuai dengan kriteria IMO.
TINGKAT KELAYAKAN OPERASIONAL KAPAL PERIKANAN 30 GT PADA PERAIRAN SULAWESI (STUDI KASUS KM INKA MINA 957) THE OPERATIONAL FEASIBILITY LEVEL OF 30 GT FISHING VESSEL IN SULAWESI WATERS (CASE STUDY OF KM INKA MINA 957) Muhammad, Andi Haris; Paroka, Daeng; Rahman, Sabaruddin; Syarifuddin, `
Marine Fisheries : Journal of Marine Fisheries Technology and Management Vol. 9 No. 1 (2018): Marine Fisheries - Jurnal Teknologi dan Manajemen Perikanan Laut
Publisher : Bogor Agricultural University

#### Abstract

The ability of a vessel to obtain catches is known as fishing vessel productivity. This greatly influences the feasibility level of the fishing operation. The objctive of the study is to evaluate the operational feasiblity level of 30 GT fishing vessel that operates in Sulawesi waters (case study INKA MINA 957). The use of  Net Present Value (NPV) and Internal Rate of Return (IRR) methods showed that the catch should be of more than minimum 116 ton per year or the NPV value at  Rp. 124.797.638,- with 10% interest rate assumption within 10 years. Furthermore, based on the internal rate of return (IRR) the interest obtained was approximately 12.2% which was higher than the market interest rate assumptions at about 2.2%. Keywords: fishing vessel, operational feasibility, NPV and IRRABSTRAKProduktivitas kapal perikanan adalah kemampuan kapal untuk memperoleh hasil tangkapan ikan. Produktivitas ini sangat mempengaruhi tingkat kelayakan operasional. Penelitian ini bertujuan untuk mengukur tingkat kelayakan operasional kapal perikanan 30 GT yang beroperasi di perairan Sulawesi (studi kasus KM INKA MINA 957). Metode Net Present Value (NPV) dan Internal Rate of Return (IRR) telah digunakan untuk mengukur tingkat kelayakan operasional. Hasil analisis menunjukkan bahwa kapal perikanan layak dioperasikan dengan prediksi hasil tangkapan minimal sebesar 116 ton pertahun atau nilai NPV sebesar Rp.124.797.638,- dengan asumsi suku bunga 10% selama 10 tahun. Selanjutnya berdasarkan Metode IRR diperoleh suku bunga 12,2%, hasil ini lebih besar 2,2% sebagaimana asumsi suku bunga dipasaran.Kata kunci: kapal perikanan, kelayakan operasional, NPV dan IRR
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

#### 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.
LOKASI KRITIS JALUR EVAKUASI PENUMPANG KAPAL PENYEBERANGAN ANTARPULAU DENGAN METODE PERGERAKAN SIMULTAN Muhammad, Andi Haris; Paroka, Daeng
Jurnal Transportasi Vol 15, No 2 (2015)
Publisher : Jurnal Transportasi

#### Abstract

MANEUVERING PERFORMANCE OF A FERRY AFFECTED BY RUDDER AREA AND SPEED Muhammad, Andi Haris; Djabbar, Muhammad Alham; Yuniarsih, Nidia
The Indonesian Journal of Naval Architecture Vol 1, No 1 (2013): Indonesian Journal of Naval Architecture
Publisher : Diponegoro University

#### Abstract

The aim of the study is to determine the effect of rudder area and speed on a ferry ship maneuvering performance, especially during the turning circle and zigzag maneuver.  MATLAB-simulink was used to simulate turning circle and zigzag maneuver. The simulation utilized model based on the concept of Mathematical Modelling Group (MMG) includes testing/separating components of the hull equations, propeller and rudder as well as the interaction among them (hull, propeller and rudder). The result of simulation indicated that rudder  dimension and ship speed  affect both turning circle and zigzag maneuver of the ferry reasonably.
Maneuverability of Ships with small Draught in Steady Wind Paroka, Daeng; Muhammad, Andi Haris; Asri, Syamsul
Makara Journal of Technology Vol 20, No 1 (2016)
Publisher : Directorate of Research and Community Services, Universitas Indonesia

#### Abstract

Wind force and moment may force a ship to drastically decrease its speed and use a large drift angle as well as a large rudder angle in order to maintain its course. Shipswith a small draught might have more risk in maneuvering to its&nbsp;point of view compared with a ship with a larger draught. This paper discusses maneuverability of a ship with a small&nbsp;draught in steady wind. The effect of wind on ship speed, drift angle, and rudder angle are investigated in a steady state condition. Five different ratios of wind velocity to ship speed from 1.0 to 20.0 are used in the simulation. The variation in wind direction is examined from 0Â°to 180Â°. Results of the numerical simulation show that thewind has a significant effect on the reduction in ship speed with a wind direction less than 100Â°. The drift angle increases due to increasing wind velocity in the same wind direction. Wind direction also has a significant effect on the drift angle especially when the wind direction is less than 140Â°. The same phenomenon was found for the rudder angle. The necessary rudder angle is greater than the maximum rudder angle of the ship when the wind direction is 60Â°with a wind velocity to ship speed ratio of 20 or more.
ANALISIS LOKASI KRITIS JALUR EVAKUASI PENUMPANG KAPAL PENYEBERANGAN ANTAR PULAU DENGAN METODE PERGERAKAN SIMULTAN Muhammad, Andi Haris; Paroka, Daeng
Prosiding Forum Studi Transportasi Antar Perguruan Tinggi The 17th FSTPT of International Symposium
Publisher : FSTPT Indonesia

#### Abstract

One of important factor to avoid accident fatalities of passanger vessel evacuation is the evacuation route design of safety. A number of critical locations can slow down the evacuation process such as doors, stairs and corridors essential for analysis. This paper discusses a number of critical locations, potential to evacuation failure, especially on ships crossing inter-islands. The method used to identify the critical location or locations where the concentration of passengers during the evacuation process is the Simultaneous Movement Method. The simulation results show that the total time required evacuation of passengers, especially on economy class of KMP Jatra II, since leaving the passenger compartment until all passengers are on the vehicle deck emergency exit is 870 seconds or 14.50 minutes, smaller than required by IMO ( 60 menit). Potential of passenger density or the critical path, starting at the 1st door where in the path traversed by all economy class passengers before entering the 1st and 2nd corridors. Maximum number of passengers that accumulates at these sites is 72 people on 300 seconds. Subsequently passengerâs concentration occurs at the meeting movement toward the passenger emergency exit vehicle deck that is derived from the 3rd and 4th corridors, at the location of a concentration of passengers up to 76 people on 490 second. This study suggests that the potential of location or critical point of the passenger evacuation path occurs at a meeting between two or more evacuation routes, especially in locations such as the transition to the doors, stairs or passenger traffic bottlenecks due to the larger capacity. The results of this analysis can also be used as a basis for determining an alternative evacuation route or routes change if the conditions are experienced during vessel operation.
LOKASI KRITIS JALUR EVAKUASI PENUMPANG KAPAL PENYEBERANGAN ANTARPULAU DENGAN METODE PERGERAKAN SIMULTAN Muhammad, Andi Haris; Paroka, Daeng
Jurnal Transportasi Vol 15, No 2 (2015)
Publisher : Jurnal Transportasi