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All Journal KAPAL Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Wave: Jurnal Ilmiah Teknologi Maritim Jurnal Penelitian Enjiniring Fakultas Teknik Unhas International Journal of Marine Engineering Innovation and Research Zona Laut : Jurnal Inovasi Sains dan Teknologi Kelautan Jurnal Techno Bahari Maritime Park: Journal Of Maritime Technology and Socienty Jurnal Riset & Teknologi Terapan Kemaritiman Indonesian Journal of Maritime Technology or abbreviated (ISMATECH)
wulandari, amalia ika
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Agriculture, Biological Sciences & Forestry Automotive Engineering 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

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Experimental Study on The Performance Characteristics of 4 Stroke CI Engine using Biodiesel Blend from Coconut Oil suardi, suardi; Paribang, Feston Sandi; Setiawan, Wira; Wulandari, Amalia Ika; Pawara, Muhammad Uswah; Nugraha Arifuddin, Andi Mursid; Alamsyah, Alamsyah
Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Vol. 13 No. 1 (2024): March 2024
Publisher : The University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtep-l.v13i1.188-196

Abstract

To address the challenges faced by the government in the realm of petroleum imports, a promising strategy was adopted in the utilization of biodegradable and renewable sources of biodiesel, such as coconut oil. This research employed two distinct methodologies: Transesterification for biodiesel synthesis and a comprehensive assessment of fuel properties. Subsequently, an experimental phase assessed biodiesel within an engine environment to analysis performance metrics. Results showed that B30 (30% coconut oil, 70% diesel oil) has density of 0.850 g/cm³, B50 (50% coconut oil) at 0.861 g/cm³, and B100 (Pure coconut oil) at 0.893 g/cm³. The values differed from regional standards. As per ASTM D6751, B30 has a viscosity of 2.31 cSt, B50 3.22 cSt, and B100 is 7.02 cSt. Engine performance revealed B50 with the highest torque at 11.787 Nm, while B0 (pure hydrocarbon diesel) has a thermal efficiency of 38%. B0’s lowest SFC (Specific Fuel Consumption) is 261.12 g/kWh at 2000 watts load and 1000 rpm. Biodiesel coconut oil provided comparable power and torque (0.3% difference from B0) but consumed more fuel (21.6 % higher usage than B0). Keywords:  Biodiesel, Coconut oil, Engine performance, Fuel properties, Transesterification.
Pengaruh Penambahan Elemen Stringer Pada Deck Barge Terhadap Nilai Tegangan Global Agusty, Cindy Lionita; Alamsyah; Wulandari, Amalia Ika; Saputra, Wahyu Dhono
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

Konstruksi utama kapal terbagi menjadi tiga jenis, yaitu konstruksi memanjang, konstruksi melintang, dan konstruksi campuran. Konstruksi memanjang kapal dikenai beban rangka bangunan dan digambarkan dalam sambungan melintang kapal yang kaku dengan bantuan balok memanjang. Senta sisi atau stringer adalah penyangga memanjang yang terbuat dari baja profil dan pelat muka, dipasang di kedua sisi bagian dalam lambung kapal. Ditemukan kasus tongkang patah lambung karena tidak memiliki senta sisi atau stringer. Penelitian ini bertujuan untuk mengetahui tegangan maksimum akibat penambahan senta sisi atau stringer terhadap tongkang, mengetahui persentase perbedaan tegangan maksimum yang terjadi pada tongkang dengan variasi jumlah stringer dan mengetahui safety factor yang terjadi pada tongkang. Metode yang digunakan adalah elemen hingga dengan bantuan software Ansys Mechanical Research. Pada penelitian ini didapatkan hasil tegangan maksimum yang terjadi pada tongkang 1 stringer sebesar 96.96 N/mm² (hogging) dan 62.20 N/mm² (sagging). Sedangkan pada tongkang 2 stringer sebesar 96.86 N/mm² (hogging) dan 62.71 N/mm² (sagging). Persentase penurunan tegangan setelah penambahan stringer ± 30% dengan factor safety dikisaran 1.55 ~ 2.41. Kata Kunci: Konstruksi, Metode Model, Stringer, Tegangan Maksimum, Tongkang
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 aluminium 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 aluminium 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.
Enhancing From Healthy Eating to Green Energy: A Dual Approach to Student Education on Nutrition and Biodiesel (Renewable Energy) Suardi, Suardi; Pawara, Muhammad Uswah; Alamsyah, Alamsyah; Nurcholik, Samsu Dlukha; Wulandari, Amalia Ika; Anggela, Anggela
Indonesian Journal of Maritime Technology Vol. 3 No. 2 (2025): Volume 3 Issue 2, December 2025
Publisher : Naval Architecture Department, Kalimantan Institut of Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35718/ismatech.v3i2.8481808

Abstract

Adolescence represents a critical stage of physical and cognitive development, requiring balanced nutrition to support growth, concentration, and academic performance. However, many students still lack awareness of healthy dietary practices and continue to consume nutrient-poor foods, leading to increased risks of metabolic and cognitive disorders. To address this issue, a dual-focus educational program was implemented at SMA Negeri 6 Penajam Paser Utara, combining balanced nutrition education with the introduction of simple renewable energy technology through biodiesel production from waste cooking oil. The program, conducted in collaboration with the Kalimantan Institute of Technology (ITK), employed interactive lectures, demonstrations, and hands-on sessions to enhance student understanding. A pre-test and post-test evaluation involving 40 students demonstrated a substantial improvement in knowledge, increasing from 45% to 96% after the intervention. Participants also expressed strong positive responses to the integration of nutritional awareness and eco-friendly technology, recognizing its relevance to daily life and environmental sustainability. The results show that this dual educational approach effectively strengthens students’ understanding of healthy eating habits while promoting environmental responsibility through waste-to-energy concepts. Overall, the program highlights the potential of combining nutrition education and renewable energy literacy as a strategic model for school-based community outreach aimed at fostering healthier, more environmentally conscious future generations.
Strategic Human Capital Development for Maritime Infrastructure through Enhanced CAD Competency in Vocational Education Pratama, Fernanda Wahyu; Wulandari, Amalia Ika; Syam, Muhammad Anjas; Wahidah, Jusma; Agusty, Cindy Lionita; Syahab , Husein
Indonesian Journal of Maritime Technology Vol. 3 No. 2 (2025): Volume 3 Issue 2, December 2025
Publisher : Naval Architecture Department, Kalimantan Institut of Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35718/ismatech.v3i2.8481886

Abstract

The Indonesian maritime industry faces a critical human capital paradox, where a surplus of vocational graduates exists alongside persistent difficulty among shipyards in recruiting personnel capable of executing modern Product-Oriented Work Breakdown Structure and digital drafting workflows. This study investigates this disconnect through the pilot implementation of an Applied CAD for Maritime Engineering curriculum at a partner vocational high school, SMKN 5. Using a Guided Replication methodology, the intervention bridged the gap between theoretical software knowledge and industrial application by emphasizing parametric modeling and design-for-production logic. The results show that student aptitude is high, as evidenced by the rapid acquisition of three-dimensional modeling skills, while the national vocational infrastructure remains critically unprepared. The study identified a significant technological readiness gap in which existing school hardware was unable to support industry-standard software, requiring external technical intervention. These findings indicate that closing the maritime skills gap requires more than curriculum reform alone, but also necessitates fundamental improvements in school computing infrastructure and a pedagogical shift from software-centric instruction toward production-centric learning. This research proposes a scalable framework for integrating industrial competencies into vocational education to support the long-term development of Indonesia’s maritime workforce.
Assessment of Wave Characteristics in National Water Borders for Tactical Vessel Analysis and Maritime Security Rahmat, Muhammad Farhan; Syahab, Husein; Wulandari, Amalia Ika; Kusuma, Cahya; Indiaryanto, Mahendra; Syam, Muhammad Anjas; Pratama, Fernanda Wahyu; Noor, Firman
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.
The Impact of Adding Stringer Elements to Barge Decks on Global Stress Values Agusty, Cindy Lionita; Alamsyah; Wulandari, Amalia Ika; Saputra, Wahyu Dhono
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 Wulandari, Amalia Ika; Syahab, Husein; Baidowi, Achmad; Adietya, Berlian Arswendo
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
Co-Authors ,, Alamsyah Achmad Baidowi, Achmad Agusty, Cindy Lionita Alamsyah Alamsyah - Anggela, Anggela Ariani, Vidya Rezeki Arifuddin, Mursid Nugraha As’ad, Miftachus Surur Berlian Arswendo Adietya Chris Jeremy Verian Sitorus Dianiswara, Anggoronadhi Firman Noor Hapsari, Dessy Purwita Hariyono, Hariyono Ikhwani, Rodlian Jamal Indiaryanto, Mahendra Kala, Charles Sambera Kustiwansa, Harlian Kusuma, Cahya Kusuma, I Putu Arya Luh Putri Adnyani M. Uswah Pawara Nugraha Arifuddin, Andi Mursid Nugroho, Muhammad Cahyo Nurmawati Nurmawati Paribang, Feston Sandi Pratama, Fernanda Wahyu Rahmasari, Nindy widia Devi Rahmat, Muhammad Farhan Renaldy, Muhammad Rafi Samsu Dlukha N Saputra, Wahyu Dhono Siswahyudianto Suardi Suardi Syahab , Husein Syahab, Husein Syam, Muhammad Anjas Wahidah, Jusma Wardina Suwedy Wira Setiawan