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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 Zona Laut : Jurnal Inovasi Sains dan Teknologi Kelautan Jurnal Techno Bahari Journal of Marine-Earth Science and Technology 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 Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Mechanical Engineering Transportation

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A Finite Element Analysis of Bottom Structure of LCT Converted from SPOB Pawara, Muhammad Uswah; Alamsyah, Alamsyah; Kusuma, I Putu Arya; Wulandari, Amalia Ika; Ikhwani, Rodlian Jamal; Arifuddin, Mursid Nugraha
Maritime Park: Journal of Maritime Technology and Society Volume 2, Issue 1, 2023
Publisher : Department of Ocean Engineering, Faculty of Engineering, Hasanuddin University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62012/mp.v2i1.25130

Abstract

SPOB (Self-Propelled Oil Barge) ship is useful for transporting oil. Due to certain requests, the owner and operator have converted SPOB into LCT. If before the conversion the ship transported oil, now the ship is transporting vehicles or heavy equipment on the deck. after the transfer of function from a SPOB ship to an LCT (Landing Craft Tank) ship, the cargo transported is different, the bottom is the part that is submerged in the water, so this part is vulnerable. Therefore, it is necessary to systematically predict the weight of the load that can be held by the ship at the bottom, this is so that there is no damage to the structure at the bottom of the ship which can harm the company from the ship owner. The purpose of this study is to find the maximum stress and strain that can be accepted by the ship and the value of the stress ratio (safety factor) in the bottom construction using the finite element method. The results obtained from the maximum stress and strain of the ship after and before conversion of 96.349Mpa, 272.56 Mpa, and 0.0013628 mm, 5.042 x 10-4 mm, safety factor according to BKI after and before conversion obtained 3.624 and 1.057, the safety factor according to the material criteria is 3.685 and 1.172, respectively, for the maximum deformation of the ship, the safety factor is 6.328 and 3.287 respectively
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 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
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.
Co-Authors ,, Alamsyah A, Alamsyah Agusty, Cindy Lionita Alamsyah Alamsyah - Anggela, Anggela Ariani, Vidya Rezeki Arifuddin, Andi Mursid Nugraha Arifuddin, Mursid Nugraha As’ad, Miftachus Surur Berlian Arswendo Adietya Dianiswara, Anggoronadhi Hapsari, Dessy Purwita Hariyono, Hariyono Ikhwani, Rodlian Jamal Kala, Charles Sambera Kustiwansa, Harlian Kusuma, I Putu Arya Luh Putri Adnyani M. Uswah Pawara Nugraha Arifuddin, Andi Mursid Nugroho, Muhammad Cahyo Nurmawati Nurmawati Paribang, Feston Sandi Rahmasari, Nindy widia Devi Renaldy, Muhammad Rafi Samsu Dlukha N Saputra, Wahyu Dhono Sitorus, Chris Jeremy Verian Suardi Suardi Suardi, Suardi Syahab, Husein Syam, Muhammad Anjas Wahidah, Jusma Wardina Suwedy Wira Setiawan