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All Journal KAPAL Jurnal Ilmu Pengetahuan dan Teknologi Kelautan JTT (Jurnal Teknologi Terpadu) Turbo : Jurnal Program Studi Teknik Mesin INOVTEK POLBENG IJOCE (International Journal of Offshore and Coastal Engineering) Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Wave: Jurnal Ilmiah Teknologi Maritim Specta Journal of Technology International Journal of Marine Engineering Innovation and Research Jurnal Techno Bahari JMES: The International Journal of Mechanical Engineering and Sciences Journal of Marine-Earth Science and Technology PIKAT Indonesian Journal of Maritime Technology or abbreviated (ISMATECH) WAVE: Jurnal Ilmiah Teknologi Maritim
Amalia Ika Wulandari
AProgram Studi Teknik Perkapalan, Institut Teknologi Kalimantan, Jl. Soekarno Hatta Km.15, Balikpapan, 76127, Indonesia
Agriculture, Biological Sciences & Forestry Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics Transportation Other

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Patrol Ship Design to Guard the Natuna Seas Suardi Huda; Amalia Ika Wulandari; Muhammad Uswah Pawara; Alamsyah; Taufik Hidayat
International Journal of Marine Engineering Innovation and Research Vol. 7 No. 3 (2022)
Publisher : Department of Marine Engineering, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v7i3.5610

Abstract

Natuna is one of the regencies in the Riau Archipelago Province, the area of Natuna Regency is 224,684.59 km2 with a land area of 2,000.85 km2 and an ocean area of 222,683.74 km2. According to the Ministry of Maritime Affairs and Fisheries, Natuna occupies the first position for the purpose of exporting fishery products from the SKPT location (Integrated Marine and Fishery Centers in Small Islands and Border Areas), namely marine fisheries resources reaching more than 1 million tons per year. The extent of Natuna waters and the large potential of existing capture fisheries resources cause the Natuna waters to be included in the Fisheries Management Area (WPP 711) which is prone to illegal fishing activities. It has been proven recently that in the waters of North Natuna there are coast guard ships from foreign countries escorting fishing vessels belonging to their countries that are carrying out illegal, unreported, and unregulated fishing activities. The purpose of this research is to design a patrol ship to carry out security missions around the Natuna waters. The method used in this design is the Parent Design Approach method. This method is known in designing ships, namely by taking a comparison ship that has the same characteristics as the ship to be designed. The main dimensions of the ship obtained in this final project are Lwl = 50.2 m, B = 9.32 m, H = 4.45 m, T = 3.5 m, Vs (max) = 25 Knots, Crew = 40 Indonesian navy. Armaments used on this ship are Oto-Melara 76/62SR 76 mm, Oerlikon Millennium 35 mm, RWS Machine Gun, and SS1-V1 Kal hand rifle. 5.56 mm.
MATERIAL RELIABILITY STUDY OF HIGH-SPEED SMALL CRAFT UNDER WAVE LOAD Amalia Ika Wulandari; Alamsyah A; Suardi S; Wira Setiawan; Muhammad Uswah Pawara; Andi Mursid Nugraha Arifuddin; Husein Syahab
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.
Respon struktur akibat perubahan jarak stiffener pada car deck Kapal Ferry Ro-Ro Alamsyah Alamsyah; Septiany Tri Pangestu; Amalia Ika Wulandari
TURBO [Tulisan Riset Berbasis Online] Vol 10 No 2 (2021): TURBO: Jurnal Program Studi Teknik Mesin
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/trb.v10i2.1705

Abstract

Ro-Ro type trans ships have a Car Deck which is useful for accommodating cargo in the form of vehicles. The construction of the deck must be strong enough so that it does not suffer structural damage when working with a certain load. In this case the stress strain becomes very important as an element of deck strength. As for what affects the strength of the deck construction, one of which is the stiffener distance. This purpose of research to determine the response of the car deck structure with variations in stiffener distance to the stress-strain value. The method used is the Finite Element Method. The results of detected the maximum stress value at a stiffener distance of 550 mm 325.471 N/mm2 with a maximum strain of 3.33 x 10-2 mm, for a stiffener distance of 650 mm the maximum stress was 407.521 N/mm2 and a maximum strain of 3.35 x 10-2 mm, a stiffener distance of 750 mm the maximum stress generated is 444.129 N/mm2 with a maximum strain of 3.36 x 10-3 mm, a stiffener distance of 850 mm, the maximum stress generated is 448.469 N/mm2 with a maximum strain of 3.43 x 10-3 mm. For a stiffener distance of 950 mm, the maximum stress is 452.567 N/mm2 with a maximum strain of 3.53 x 10-3 mm.
Analisis kekuatan struktur ramp door haluan pada kapal Ferry Ro-Ro 1500 GT dengan variasi beban menggunakan Finite Element Method Alamsyah Alamsyah; Amalia Ika Wulandari; Muhammad Uswah Pawara; Muhammad Yusuf Al-Hafidz
TURBO [Tulisan Riset Berbasis Online] Vol 11 No 2 (2022): TURBO : Jurnal Program Studi Teknik Mesin
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/trb.v11i2.2161

Abstract

Ramp Door is a door to put a vehicle into a Ro-Ro ship or any other type of ship that transports vehicles. The use of Ramp Door is needed to facilitate the process of unloading and loading vehicles from the crossing dock to the ship and vice versa. This study aims to analyze the strength of Ramp Door structure with load variations from various types of vehicles in order to compress the maximum stress results and safety factors. The method used is the FEM method with the help of an element-based application up to. The results of the study obtained the maximum stress value of Ramp Door Bow with MPV vehicle type at an even load is 43.26 MPa. In this type of SUV vehicle, the maximum stress with an even load is 50.37 MPa. In sedan vehicle type the maximum stress with an even load is 37.61 MPa. in commerial vehicle type the maximum stress with an even load is 45.70 MPa. In this type of small truck vehicle, the maximum stress with an even load is 81.53 MPa. In large truck vehicles the maximum stress with an even load is 302.48 MPa. In this type of vehicle, the maximum stress bus with an even load is 178.08 MPa. For the largest safety factor value is a type of Commercial vehicle with a value of 8.91. While the smallest safety factor value is the type of Big Truck vehicle with a safety factor value of 1.01.
The Impact of Adding Stringer Elements to Barge Decks on Global Stress Values Cindy Lionita Agusty; Alamsyah; Amalia Ika Wulandari; Wahyu Dhono Saputra
Techno Bahari Vol. 12 No. 2 (2025): Oktober
Publisher : Politeknik Negeri Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52234/tb.v12i2.352

Abstract

Ship construction includes three main types of construction, namely longitudinal construction, transverse construction, and mixed construction. The longitudinal construction of the ship is subjected to truss loads and is depicted in the rigid transverse joints of the ship with the aid of longitudinal beams. Senta side or stringer is a longitudinal support made of profile steel and faceplate, mounted on both sides of the inside of the ship's hull. There was a case of a barge with a broken hull because it did not have a side beam or stringer. This study aims to determine the maximum stress due to the addition of a side beam or stringer to the barge. The method used is finite element with the help of Ansys Mechanical Research software. In this study, the maximum stress that occurred on the 1 stringer barge was 96.96 N/mm² (hogging) and 62. 20 N/mm² (sagging). While on the 2 stringer barge it is 96.86 N/mm² (hogging) and 62.71 N/mm² (sagging). The percentage of voltage drop after the addition of a stringer is ± 30% with a safety factor in the range of 1.55 ~ 2.41.
Structural Response Analysis During Slamming Events on Speedboats Using Aluminum Material Amalia Ika Wulandari; Husein Syahab; Achmad Baidowi; Berlian Arswendo Adietya
International Journal of Marine Engineering Innovation and Research Vol. 10 No. 3 (2025)
Publisher : Department of Marine Engineering, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v10i3

Abstract

The structural response analysis of an aluminum speedboat during slam-ming due to regular waves was conducted using the one-way fluid-structure interaction method. This method involves generating waves through hydrody-namic diffraction to obtain loads, which are then applied to the ship's struc-ture and analyzed using finite element analysis. It is known that the greater the force generated from slamming , the stress and deformation at the critical load point will increase. In addition to being influenced by the critical point, the maximum stress is also influenced by the ship's construction design. It has been found that the highest stress and deformation occur on the surface of the plate that is not supported by the transverse construction. Therefore, it can be concluded that the construction design can influence the magnitude of the structural response to the slamming event . Efforts that can be made by ship designers and manufacturers are to convert ships by using materials that are better at absorbing loads, such as the use of sandwich materials
Assessment of Wave Characteristics in National Water Borders for Tactical Vessel Analysis and Maritime Security Muhammad Farhan Rahmat; Husein Syahab; Amalia Ika Wulandari; Cahya Kusuma; Mahendra Indiaryanto; Muhammad Anjas Syam; Fernanda Wahyu Pratama; Firman Noor
Indonesian Journal of Maritime Technology Vol. 4 No. 1 (2026): Volume 4 Issue 1, June 2026
Publisher : Naval Architecture Department, Kalimantan Institut of Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35718/ismatech.v4i1.8481963

Abstract

This study addresses the challenge of accurately representing wave conditions in Indonesian waters for ship design, where conventional standards based on North Atlantic extremes may lead to over-conservative designs. The objective is to evaluate seasonal wave characteristics in four representative regions—North Natuna Sea, Ambalat Block, Timor Sea, and Arafura Sea—and assess their implications for ship operational reliability. Hourly wind and wave data for 2025 were obtained from ERA5 reanalysis, while bathymetric information was sourced from BATNAS. Analyses included directional distribution (wind and wave rose), temporal variability of significant wave height (Hsig) and peak period (Tp), wave energy estimation using linear wave theory, and comparison between empirical data and analytical probability models via a Weibull distribution. Results show that the North Natuna Sea experiences the highest wave loading (Hsig up to 4.450 m; energy 13.316 kW/m) due to long fetch and bathymetric shoaling. Ambalat Block exhibits minimal wave energy (0.850 kW/m) despite deep waters, indicating fetch-limited growth. Timor Sea presents moderate Hsig (1.5–2.3 m) with long wave periods (>20 s) driven by swell, while Arafura Sea shows high Hsig (2.663 m) and energy (5.526 kW/m), though shallow-water effects limit wave growth and increase wave steepness. These findings demonstrate that wave loading is controlled not only by height, but also by period and bathymetric transformation. Incorporating site-specific and seasonal wave characteristics is essential for realistic and efficient ship design and operational assessment.
Comparative Analysis of Turbulence Models for Gawn Series Propeller using CFD Method Adhyve Priambodo Bhaskara; I Ketut Suastika; Mahendra Indiaryanto; Taufiq Arif Setyanto; Amalia Ika Wulandari; Dimas Fajar Prasetyo
Indonesian Journal of Maritime Technology Vol. 4 No. 1 (2026): Volume 4 Issue 1, June 2026
Publisher : Naval Architecture Department, Kalimantan Institut of Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35718/ismatech.v4i1.8481984

Abstract

The rapid advancement of computational technology has positioned Computational Fluid Dynamics (CFD) as an effective tool for predicting marine propeller hydrodynamic performance. This study applies a CFD-based numerical method using Reynolds-Averaged Navier–Stokes (RANS) equations to evaluate and compare the accuracy of three turbulence models, namely k–ε, k–ω, and k–ω SST for a Gawn Series marine propeller. CFD simulations were conducted by varying the advance coefficient (J). Verification of the results for each turbulence model was carried out through Grid Independence Study and Grid Convergence Index analysis. The CFD simulation results were then compared with experimental test data using the Root Mean Square Error (RMSE) method, with KT, 10KQ, and efficiency as evaluation parameters. The results demonstrate that the k–ω SST model provides the most consistent and accurate predictions across the entire operating range, with RMSE values of 1.24% for KT, 1.98% for 10KQ, and 1.88% for efficiency. Pressure‑contour visualization from the k–ω SST model shows the smoothest pressure distribution on the blade surface, while pathline visualization reveals the clearest, most consistent, and well‑balanced vortex structures downstream of the propeller, thereby providing a robust and reliable basis for selecting the most suitable turbulence model to improve the accuracy of CFD based marine propeller performance prediction.
Resistance Analysis for the Application of Flowbow on DTMB 5415 Ship Arga Setya Andreardani; I Ketut Suastika; Baharuddin Ali; Taufiq Arif Setyanto; Mahendra Indiaryanto; Amalia Ika Wulandari; Anson Novendra Pradana
Indonesian Journal of Maritime Technology Vol. 4 No. 1 (2026): Volume 4 Issue 1, June 2026
Publisher : Naval Architecture Department, Kalimantan Institut of Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35718/ismatech.v4i1.8481997

Abstract

Flowbow is an innovation designed by Rasmussen to increase fuel efficiency by reducing wave making resistance of ship. It is claimed that Flowbow can reduce the resistance of displacement and semi-displacement hull type at Froude number (Fr) over 0.25 to 0.28. On a warship, resistance reduction can increase the patrolling endurance by reducing energy used to moving. This research comparing the hull of DTMB 5415 model, which is already using bulbous bow and the modified DTMB 5415 hull with the addition of Flowbow using CFD which is validated by EFD. The results show that the addition of a Flowbow reduces ship resistance at Fr greater than 0.249 and the resistance reduction increases as the ship speed increases. At the highest tested speed (Fr = 0.352), the total resistance reduction reaches 8.57%.
Structural Response and Optimization of a Tugboat Midship Section Under Varied Transverse Frame Spacing Using Finite Element Analysis Amalia Ika Wulandari; Alamsyah Alamsyah; Hariyono; Ryan Raruk; Husein Syahab; Muhammad Anjas Syam; Suardi Suardi; Dimas Fajar Prasetyo
Indonesian Journal of Maritime Technology Vol. 4 No. 1 (2026): Volume 4 Issue 1, June 2026
Publisher : Naval Architecture Department, Kalimantan Institut of Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35718/ismatech.v4i1.8482002

Abstract

Transverse framing systems serve as a critical structural backbone for marine vessels, governing localized stiffness and cross-sectional hull strength. This study investigates the structural response of a tugboat’s midship section under various transverse frame spacing configurations using the Finite Element Method (FEM) to optimize lightweight tonnage (LWT) while maintaining seaworthiness. Utilizing structural data from a under-30-meter service tugboat, five distinct frame spacing variations 500 mm (baseline actual design), 550 mm, 575 mm, 600 mm, and 625 mm were modeled using four-node shell elements (SHELL181) within ANSYS software. A constant uniform static deck pressure load of 0.0122 MPa was applied to evaluate localized stress distributions and elastic displacement fields under rigid boundary conditions. Numerical simulations reveal a progressive, linear increase in both equivalent stresses and vertical deflections as the unsupported span of the deck plating expands. The maximum von Mises equivalent stress escalated from 31.4237 MPa at the 500 mm baseline configuration to 34.1552 MPa (550 mm), 35.4687 MPa (575 mm), 36.8590 MPa (600 mm), and peaked at 40.6607 MPa under the widest 625 mm spacing. Concurrently, the total displacement vector sum rose from 0.56047 mm at the baseline to a peak of 0.86030 mm at 625 mm spacing due to the reduction of localized flexural rigidity. Crucially, despite the elevated structural responses, all configurations safely satisfy the strict structural limits enforced by the Indonesian Classification Bureau (BKI 2022) rules, as the maximum peak stress (40.6607 MPa) remains substantially below the nominal upper yield strength of ordinary hull structural steel (ReH = 235 N/mm2). These findings demonstrate that extending the transverse frame spacing up to 625 mm is structurally viable, offering a verified mechanism for weight optimization without compromising structural safety margins.
Co-Authors Achmad Baidowi Adhyve Priambodo Bhaskara Aknul Ciptiandi Alamsyah Alamsyah A Alamsyah Alam Alamsyah Alamsyah Alamsyah Alamsyah Alamsyah Alamsyah Alamsyah, Alamsyah Andi Mursid Nugraha Arifuddin Anggit Dwi Putra Anggoronadhi Dianiswara Anggoronadhi Dianiswara Anson Novendra Pradana Arga Setya Andreardani Arman Fauzi Ayuna Noor aini Baharuddin Ali Berlian Arswendo Adietya Bimo Harseno Ramadhan Cahya Kusuma Cindy Lionita Agusty Cindy Lionita Agusty Cindy Lionita Agusty Desinta Larasati Ashar Dimas Fajar Prasetyo Dimas Fajar Prasetyo Dimas Putra Wahid Rusparyansyah Dimas Putra Wahid Rusparyansyah Erskine Simei Tonda Fernanda Wahyu Pratama Feston Sandi Paribang Firman Noor Guskarim Rompon Hariyono Hijriah Hijriah Husein Syahab Husein Syahab Husein Syahab I Ketut Suastika I Ketut Suastika Ivan Fadilah Ivan Fadilah Lista Putri Adinda Rahmi M. Uswah Pawara Mahendra Indiaryanto Mahendra Indiaryanto Mahendra Indiaryanto Merlistyo Driantama Arwan Mohammad Ardha Wiku Wicaksono Muhammad Anjas Syam Muhammad Anjas Syam Muhammad Farhan Rahmat Muhammad Yusuf Al-Hafidz Muhdar Tasrief Nurmawati Nurmawati Nurmawati Nurmawati Nurul Huda Raditya, Muhammad Yogi Rifai, Muhammad Rizky Risaldo Rodlian Jamal Ikhwani Ryan Raruk Ryanda Bayu Laksana Samsu Dlukha N Septiany Tri Pangestu Setiawan, Wira Suardi Huda Suardi S Suardi Suardi Suardi Suardi Taufik Hidayat Taufik Hidayat Taufiq Arif Setyanto Taufiq Arif Setyanto Wahyu Dhono Saputra Wira Setiawan Wira Setiawan Wira Setiawan Wira Setiawan