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All Journal KAPAL Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Journal of Marine-Earth Science and Technology
IKAP Utama
Institut Teknologi Sepuluh Nopember, Surabaya
Earth & Planetary Sciences Energy

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KAJIAN PENGEMBANGAN KAPAL WISATA BERBASIS ENERGI ALTERNATIF: KOMBINASI LAYAR DAN PANEL SURYA Purwanto, Dedi Budi; Utama, IKAP
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 12, No 1 (2015): Februari
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (416.681 KB) | DOI: 10.14710/kpl.v12i1.8177

Abstract

Potensi energi alternatif yaitu angin dan matahari dapat dimanfaatkan secara maksimal untuk membantu energi kapal wisata di Madura. Desain lambung yang digunakan adalah tipe monohull dan katamaran pada displasemen yang sama sebesar 6 ton, didapatkan besaran hambatan dengan menggunakan analisa numerik CFD yang diperlukan untuk menghitung kebutuhan daya terhadap kecepatan relatif  kapal. Penyelidikan secara numerik dimulai dengan Pre-processing yang meliputi pembuatan geometri benda, dan meshing. tahap pemilihan solver yang meliputi pemilihan boundary-condition, pemilihan model laminar maupun turbulensi aliran, pemilihan jenis fluida dan struktur, dan pemilihan solving-equation bertujuan untuk mendapatkan data gaya-gaya hidrodinamika dan efeknya terhadap lambung kapal maupun layar pada saat menerima aliran fluida. Gaya yang dihasilkan oleh layar dengan bentuk segitiga dengan ukuran lebar sebesar 3 meter dan tinggi sebesar  4 meter, sebesar  0.812 kN. Luasan panel surya yang tersedia untuk kapal monohull sebesar 24m2 mampu memberikan konstribusi power sebesar 3.42 kW, sedangkan untuk tipe katamaran sebesar 54m2 mampu memberikan konstribusi power sebesar 7.7 kW. Kapal monohull dengan L = 12 m, B = 2.4 m, T = 1 m, menggunakan layar dan panel surya memberikan konstribusi kecepatan kapal sebesar 6 knot, sedangkan untuk kapal katamaran dengan ukuran utama L = 12 m , B = 6 m, T = 0.55 m, menggunakan layar dan panel surya memberikan konstribusi kecepatan kapal sebesar 8 knot.
THE INFLUENCE OF SLOW STEAMING ON FUEL USAGE AND CARBON EMISSIONS OF CONTAINER SHIPS: A CASE STUDY OF THE SURABAYA-MAKASSAR ROUTE Meiliana, SW; Syahab, H; Wulandari, AI; Utama, IKAP
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.v5i3.1426

Abstract

The practice of slow steaming in maritime transport, initially introduced in the 1970s during the first oil crisis, has evolved into a strategy offering both cost reduction and environmental benefits. The overall combined costs for carriers and shippers experienced significant reductions with slow steaming, with extra slow steaming yielding even greater cost savings. While slow steaming is not the sole method to reduce fuel consumption and emissions, it proves to be the most efficient in terms of time and cost. Shipping operators globally recognize its advantages, as it aligns with environmental sustainability efforts by reducing greenhouse gas emissions. This study carried out a comprehensive exploration of the effects of slow steaming on container ships, focusing specifically on the Surabaya-Makassar route. The research aims to learn how much the impact of slow steaming on the ship operation. This study analyzes the impact of slow steaming on container ships in terms of fuel consumption and carbon emissions on the Surabaya-Makassar route. The lowest speed is 5 knots, and the highest speed is 11 knots. At a speed of 5 knots, fuel consumption decreases by 5% compared to the ship's speed at 11 knots. The same applies to the reduction in carbon emissions.
SENSITIVITY ANALYSIS OF HYDROSTATIC PARAMETERS WITH RESPECT TO DISPLACEMENT CHANGES ON THE MINI BORNEO BARGE Romadhoni, Romadhoni; Santoso, Budhi; Utama, IKAP
Journal of Marine-Earth Science and Technology Vol. 6 No. 1 (2025): April
Publisher : Marine & Earth Science and Technology Research Center, DRPM, ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

This study presents a systematic sensitivity analysis of key hydrostatic parameters, keel to buoyancy distance (KB), metacentric radius (BM), and metacentric height (GM), with respect to incremental changes in displacement for the Mini Borneo barge. Utilizing only the vessel’s official stability booklet data, natural cubic splines were fitted to the discrete hydrostatic tables to reconstruct continuous functions for each parameter over the displacement range of 256.6 t to 1641.0 t. First derivative functions were then derived analytically and cross-validated via centered finite difference, enabling high-resolution evaluation of ∂KB/∂Δ, ∂BM/∂Δ, and ∂GM/∂Δ at 0.01 t increments. Results indicate that KB sensitivity peaks at a moderate load of approximately 436.6 t (0.00045 m/t), whereas BM and GM sensitivities reach their maxima at full-load conditions near 1641.0 t (0.00086 m/t and 0.00092 m/t, respectively). Critical displacement intervals were identified around these peaks, highlighting narrow bands where small weight additions most profoundly affect stability. These findings inform the definition of safe-loading envelopes and ballast-management strategies, providing practical thresholds to maintain regulatory stability margins without the need for additional sea trials. The methodology is readily generalizable to other small craft equipped with hydrostatic booklets..
Co-Authors Budhi Santoso Dedi Budi Purwanto Meiliana, SW Romadhoni Romadhoni, Romadhoni Syahab, H Wulandari, AI