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All Journal KAPAL Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Construction and Material Journal Jurnal Techno Bahari Journal of Marine-Earth Science and Technology Indonesian Journal of Maritime Technology or abbreviated (ISMATECH)
Syahab, Husein
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Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Earth & Planetary Sciences Electrical & Electronics Engineering Energy Industrial & Manufacturing Engineering Mechanical Engineering Transportation

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Numerical Simulation of Sloshing in Different Tank shape with Vertical and Horizontal Baffle Using Smoothed Particle Hydrodynamics Trimulyono, Andi; Adietya, Berlian Arswendo; Alvianto, Jodhy Irsyad; Chrismianto, Deddy; Syahab, Husein
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 21, No 2 (2024): June
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v21i2.64288

Abstract

Computational Fluid Dynamics (CFD) is a numerical analysis used to solve problems related to free surface flows. Two major methods have been developed in the CFD, mesh-based and meshless CFD, in this paper. The meshless CFD approach, Smoothed Particle Hydrodynamics (SPH), is employed. SPH is a meshless method where each fluid is represented by a point or particle. In this study, a 3D simulation was carried out for the phenomenon of sloshing with roll motion in prismatic, square, cylindrical and spherical tanks with a duration of sloshing of 28 seconds. The filling ratio was 25% for all tanks used in this study. Vertical and horizontal baffles were also used to suppress the sloshing. The ratio height of the vertical baffle is 0.9, and the horizontal baffle is 0.2. The results of this study show a successful comparison of dynamic pressure, free surface heights, forces, and moments in various tank variations. The installation of baffles in the tank influences the sloshing phenomenon, especially in the use of vertical baffles, where the vertical baffle is the most effective baffle used in all tanks.
Comparative Analysis of Installed and Actual Pump Power in Bilge and Ballast Systems: Study Case on 60 m Buoy Laying Vessel Rodlian Jamal Ikhwani; Nurcholik, Samsu Dlukha; Saputra, Muhammad Rizky; Hidayat, Taufik; Syahab, Husein
Indonesian Journal of Maritime Technology Vol. 2 No. 1 (2024): Volume 2 Issue 1, June 2024
Publisher : Naval Architecture Department, Kalimantan Institut of Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35718/ismatech.v2i1.1198

Abstract

The piping system of a ship is an essential system that is crucial for the ship's operation. An example of tasks related to the ship's piping system is the design of the system itself. When designing a piping system, certain assumptions are made in calculating the pump power. As a result, the installed pump power is often greater than the actual pump power needed. In this thesis, the actual pump power in the bilge and ballast piping system of a 60 m buoy laying vessel needs to be analyzed. To achieve this, comprehensive and detailed data collection of the piping system is required. Then, the piping system must be drawn in full detail using 3D software to match the actual installation of the piping system. After that, the actual pump power for the piping system can be calculated. The calculated pump power is 5.79 kW, with the pump specifications being an centrifugal pump model with an output of 7.5 kW, chosen due to selecting a pump power approximately 16% lesser than the existing power.
ANALISA KEKUATAN KONSTRUSKI DOUBLE BOTTOM KAPAL AKIBAT PERUBAHAN UKURAN MANHOLE SEBAGAI UPAYA UNTUK MENINGKATKAN KESELAMATAN PELAYARAN DI ALKI II Jamal Ikhwani, Rodlian; Hariyono, Hariyono; Mujib Syadzali, Abdul; Alamsyah, Alamsyah; Syahab, Husein
Construction and Material Journal Vol. 7 No. 2 (2025): Construction and Material Journal Vol. 7 No. 2 Oktober 2025
Publisher : Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/cmj.v7i2.7858

Abstract

This study analyzes the strength of the ship's double bottom construction due to changes in manhole size to improve shipping safety in Indonesian Archipelagic Sea Lane II (ALKI II). The study was conducted at Taboneo Anchorage, South Kalimantan, which is a busy shipping route. The initial stage includes measuring the ship's structure and tidal data, as well as collecting secondary data in the form of construction drawings and material specifications for General Cargo type ships. Next, structural modeling was carried out using the Finite Element Method (FEM) approach with reference to Indonesian Classification Bureau (BKI) Rules 2025. The cargo load and bottom load were calculated and input into the model. Three variations of manhole sizes were tested: 350 x 450 mm, 400 x 600 mm, and 400 x 800 mm. The simulation results show that at 350 x 450 mm, the maximum stress is 111.23 N/mm² and the displacement is 4.9 mm, still safely below the BKI permit limit (150 N/mm²). At a size of 400 x 600 mm, the stress increases to 124.68 N/mm² with a displacement of 5.32 mm, which remains safe and recommended. However, the size of 400 x 800 mm produces a stress of 283.23 N/mm² and a displacement of 9.79 mm, exceeding the allowable limit and thus risking structural failure. The maximum recommended manhole size is 400 x 600 mm to maintain construction strength and navigation safety in ALKI II.
MATERIAL RELIABILITY STUDY OF HIGH-SPEED SMALL CRAFT UNDER WAVE LOAD Wulandari, Amalia Ika; A, Alamsyah; S, Suardi; Setiawan, Wira; Pawara, Muhammad Uswah; Arifuddin, Andi Mursid Nugraha; Syahab, Husein
Journal of Marine-Earth Science and Technology Vol. 5 No. 3 (2024): December
Publisher : Marine & Earth Science and Technology Research Center, DRPM, ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j27745449.v5i3.3921

Abstract

This study focuses on analyzing the structural characteristics of a small craft constructed using aluminum alloy compared with sandwich material structure. High speed vessels are designed to address key performance challenges such as vessel motion, engine efficiency, fuel consumption, and cargo capacity. However, to endure extreme wave induced loads, enhancement of vessel’s the structural strength is essential, especially in critical areas like the midship section. Analytical models and probabilistic methods are employed to predict structural performance under both constant and random wave loading conditions. Aluminum alloys are commonly chosen for fast boat construction due to their high strength to weight ratio and corrosion resistance. To evaluate structural behavior, simulations are carried out under varying wave heights and directions, providing insight into how the vessel performs in challenging marine environments. Load analysis is conducted using diffraction theory and the JONSWAP spectrum equation to determine the maximum bending moments experienced by the hull. The results show that both aluminum and sandwich structures exhibit similar reliability thresholds under wave-induced loading, but the sandwich structure consistently performs slightly better, with approximately 0.10% higher reliability. This suggests that sandwich materials offer improved structural integrity, making them the more suitable choice for high-speed small craft operating in wave conditions up to 2 meters. This analysis contributes to a deeper understanding of the reliability and performance of these materials, offering valuable guidance for designing and constructing high Small Crafts that perform efficiently and safely in demanding maritime operations.
Analisis Dinamika Kapal Ikan Berlambung Katamaran terhadap Fenomena Bottom Slamming dan Deck Wetness Sitorus, Chris Jeremy Verian; Alamsyah; Setiawan, Wira; Anjas Syam, Muhammad; Lionita Agusty, Cindy; Wahidah, Jusma; hariyono; Kustiwansa, Harlian; Syahab, Husein; Wahyu Pratama, Fernanda; Bahri, Irham
Techno Bahari Vol 12 No 1 (2025): Maret
Publisher : Politeknik Negeri Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52234/tb.v12i1.346

Abstract

Kurangnya perhatian terhadap aspek keselamatan dalam desain kapal ikan, di mana pembuat kapal lebih berfokus pada hasil tangkapan. Analisis bottom slamming dan deck wetness diperlukan untuk menghindari kondisi berbahaya saat menghadapi cuaca buruk. Nilai RAO(Response Amplitude Operator) kapal ikan katamaran perlu untuk diketahu dengan variasi sudut gelombang 0°, 90°, 135°, dan 180° serta menghitung probabilitas deck wetness dan bottom slamming. Perhitungan RAO dilakukan menggunakan metode optimasi dengan perangkat lunak Maxsurf pada variasi muatan 25% DWT ,50% DWT, dan 100% DWT. Hasil penelitian menunjukkan bahwa amplitudo heave tertinggi terjadi pada kondisi 100% DWT, kecepatan 6,45 knot, dan sudut gelombang 0°, sebesar 0,131 meter. Amplitudo pitch tertinggi adalah 2,02 derajat pada kondisi yang sama, sedangkan amplitudo roll tertinggi terjadi pada 50% DWT, kecepatan 6,45 knot, dan sudut gelombang 90°, sebesar 3,43 derajat. Probabilitas deck wetness sebesar 0,24% dan bottom slamming sebesar 0.0000000014996%, keduanya telah memenuhi standar NORDFORSK 1987. Kata Kunci: Bottom Slamming ; Deck Wetness; DWT ; Probabilitas; RAO
Slamming Probability and Impact to Speedboats Hull Based on Seakeeping Motion wulandari, amalia ika; Syahab, Husein; Adietya, Berlian Arswendo
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 22, No 3 (2025): October
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v22i3.77940

Abstract

Slamming is a critical dynamic load for small, high-speed craft because repeated hull–wave impacts can generate intense stresses and deformations that threaten structural integrity. This study investigates the probabilistic risk of slamming and the resulting structural response of an aluminum speedboat by integrating seakeeping motion analysis with structural evaluation. First, vessel motions and wave-induced pressures were computed using the Boundary Element Method (BEM) under regular wave conditions with significant heights of 0.125 m, 0.25 m, and 0.50 m. Heave and pitch motions were quantified through Response Amplitude Operators, and their statistics were used to estimate the probability of bottom slamming. The probability associated with pitch increased from 54 % at 0.125 m to 86 % at 0.50 m, showing that pitch is the dominant trigger for slamming. The calculated hydrodynamic pressures were then applied to a detailed Finite Element Method (FEM) model of the aluminum hull to evaluate structural stresses and deformations. As wave height increased from 0.125 m to 0.50 m, the maximum slamming load rose from 2.28 × 10⁻³ MPa to 9.10 × 10⁻³ MPa, causing peak structural stresses to climb from 4.77 MPa to 19.06 MPa and maximum deformations from 0.19 mm to 0.76 mm. Stress concentrations were consistently located on unsupported bottom plating near the bow, while areas reinforced by transverse frames experienced much lower response. These findings demonstrate that both sea-state severity and hull reinforcement layout govern slamming vulnerability, providing practical guidance for strengthening small craft against impulsive wave impacts
Co-Authors A, Alamsyah Abdul Mujib Syadzali Alamsyah Alamsyah - Alvianto, Jodhy Irsyad Andi Trimulyono Anjas Syam, Muhammad Arifuddin, Andi Mursid Nugraha Bahri, Irham Berlian Arswendo Adietya Deddy Chrismianto Hariyono Hariyono, Hariyono Jamal Ikhwani, Rodlian Kustiwansa, Harlian Lionita Agusty, Cindy M. Uswah Pawara Rodlian Jamal Ikhwani Samsu Dlukha N Saputra, Muhammad Rizky Sitorus, Chris Jeremy Verian Suardi Suardi Taufik Hidayat Wahidah, Jusma Wahyu Pratama, Fernanda Wira Setiawan wulandari, amalia ika