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All Journal KAPAL Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse)
Firdaus, Nurman
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Aerospace Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Engineering Industrial & Manufacturing Engineering Mechanical Engineering

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Analisa Hidrodinamika Kapal Container Sarat Rendah Ali, Baharuddin; Firdaus, Nurman; Nurhadi, N
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 14, No 3 (2017): Oktober
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (895.825 KB) | DOI: 10.14710/kpl.v14i3.15594

Abstract

Kapal container sebagai sarana angkutan barang berpengaruh vital terhadap laju percepatan perekonomian nasional. Kondisi perairan Indonesia yang kedalaman dan fasilitas pendukung pelabuhan bervariasi serta efisiensi operasional kapal menjadi pertimbangan dalam mendesain kapal. Penggunaan kapal sarat rendah tipe barge bermesin sebagai pengangkut container, Self Propelled Container Barge (SPCB) saat ini banyak menjadi pilihan operator kapal dalam melayani pengiriman barang dengan container. Penelitian ini menyajikan analisis hidrodinamika kapal SPCB 100 TEUs dengan metode pengujian model meliputi seakeeping, turning dan zig-zag manuvering serta resistance test. Dari hasil uji seakeeping diketahui bahwa respon gerak kapal pada kondisi gelombang sea-state 4 masih dalam batas toleransi dengan memperhatikan kombinasi kecepatan dan arah heading kapal. Kinerja  manuvering turning dan zig-zag kapal dalam batas aman yang ditetapkan IMO. Dari hasil uji resistance didapatkan kecepatan maksimal yang optimum kapal adalah 12 knot. Selain besaran terukur, uji hidrodinamika dengan model memberikan gambaran fenomena saat kapal beroperasi di laut, sehingga menjadi informasi yang penting dalam desain dan operasional kapal.
The Wave Heights Distribution of Random Wave Based on Ocean Basin Firdaus, Nurman; Ali, Baharuddin; Nasir, Mochammad; Muryadin, M
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 17, No 3 (2020): October
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v17i3.31021

Abstract

The wave height parameter in ocean waves is one of the important information for a marine structure design. The present paper investigates the results of wave heights distribution from laboratory-generated for single sea state. Data of the random wave time series collected at the ocean basin are analyzed using the wave spectrum and compared with the theoretical spectrum in this study. The random wave data is varied with four sea states consisting of sea states 3, 4, 5 and 6 obtained from laboratory measurements. The parameter conditions of generated sea waves are represented by a value of significant wave height and wave peak period in the range of sea states. The individual wave heights data in each sea state are presented in the form of exceedance probability distribution and the predictions using a linear model. This study aims to estimate the wave heights distribution using the Rayleigh and Weibull distribution model. Furthermore, the accuracy of the wave heights distribution data's prediction results in each sea state has been compared and examined for both models. The applied linear models indicate similar and reasonable estimations on the observed data trends.
Hydrodynamic Analysis of Patrol Vessel Based On Seakeeping and Resistance Performance Firdaus, Nurman; Ali, Baharuddin
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 60 No 1 (2018): Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse)
Publisher : International Society of Ocean, Mechanical and Aerospace -scientists and engineers- (ISOMAse)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (711.611 KB) | DOI: 10.36842/jomase.v60i1.66

Abstract

The patrol vessel must have a good performance criteria for a sea worthiness.The hydrodynamic aspects analysis of a ship design is a main step conduct by designer. This study describes an analysis of motions and ship resistance. The seakeeping test conducted two variations of a ship loading condition. The ship's motion response to sea-state 4 waves with the heading of 180 and 135 deg. The ship resistance test with two draft conditions is calculated by model test and numerical simulation. The ship motion response is expressed in terms of the probability distribution. The values of ship resistance are presented as a non-dimensional graph with a Froude number. The ship loading conditions on a vertical center of gravity is higher resulting in a larger ship motion response than lower vertical center of gravity, as well as the heading of wave is very influential. The results of resistance test above Froude number 0.3, a resistance of ship increase and began to appear hump resistance around a hull.
Experimental Study of the Probability Distributions on the Seakeeping Performance of Monohull and Catamaran Design Ali, Baharuddin; Firdaus, Nurman
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 47 No 1 (2017): Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse)
Publisher : International Society of Ocean, Mechanical and Aerospace -scientists and engineers- (ISOMAse)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1297.325 KB) | DOI: 10.36842/jomase.v47i1.174

Abstract

A safety and a comfort criteria of ship, one of them which can be known from ability of the ship motion on sea wave. The development of maritime technology in particular shipbuilding, catamaran ship design is one of the considerations in modern ship design, in addition to monohull ship design. This research describes the analysis of seakeeping model test of monohull and catamaran ship. The seakeeping model test is performed on sea- state 4 with a heading of 45 deg, 90 deg, 135 deg and 180 deg. Ship motion responses in the form of heave, pitch and roll motion, are presented in the form of the probability distribution curves. From the results of seakeeping test, it can be seen that the catamaran ship provides motion response relatively smaller than the monohull ship.
Co-Authors Baharuddin Ali, Baharuddin Muryadin, M Nasir, Mochammad Nurhadi