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All Journal Marine Fisheries: Jurnal Teknologi dan Manajemen Perikanan Laut KAPAL Jurnal Ilmu Pengetahuan dan Teknologi Kelautan
Muryadin, Muryadin
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Earth & Planetary Sciences Environmental Science

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Numerical Analysis of The Effects of Propeller High Thrust Distribution on Propulsion System Performance Sandjaja, Irfan Eko; Ariana, I Made; Erwandi, Erwandi; Indiaryanto, Mahendra; Muryadin, Muryadin; Adietya, Berlian Arswendo
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 20, No 3 (2023): October
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v20i3.54715

Abstract

High ship propulsion performance is the main goal of designers, propeller is one component of the propulsion system that also affects the performance of the propulsion. In propeller planning, it is necessary to pay attention to the efficiency of the propeller, in addition to reducing ship operating costs and reducing CO2 gas emissions which is one of the requirements for ships built above 2013, the rules have been made into the Energy Efficiency Design Index (EEDI) standard. At this time the propeller that is widely used is the B Series propeller including the propeller design used on mini LNG ships, namely the B6.40 propeller, the B Series propeller has a pitch character from the Wageningen Propeller Series study. Innovations are made to get better propeller efficiency by varying the pitch distribution. The B6.40 propeller of the standard constant pitch type was modified to B6.40 variable pitch (high thrust). Propellers with high thrust have better efficiency especially for non-fast boats. This study was conducted to obtain the best propeller efficiency of a constant pitch propeller and three high thrust propeller units using Numeca's Computational Fluid Dynamics (CFD) numerical self-propulsion test. For validation of the simulation program by comparing the results of the open water test B6.40 Wageningen while resistance validation by comparing the ship resistance model test. The results of the self-propulsion test using Disc Actuator show that the propulsion coefficient (PC) of Modified-2 and Modified-3 high thrust propellers is better when compared to constant pitch. The magnitude of the increase in PC value reaches ± 4% higher than the constant pitch type on the Modified-3 propeller.
Risk Analysis of Ship Collision and Modelling of Oil Spill Trajectory Study Case : Dumai Port Noor, Fariz Maulana; Handani, Dhimas Widhi; Muryadin, Muryadin; Sari, Dian Purnama; Wijaya, Rio Dwi Sakti; Prasetyo, Dimas Fajar; Setiyobudi, Nanang; Putra, Arfis Maydino Firmansyah; Malakani, Arga Iman; Afandi, Mohamad Imam
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 22, No 1 (2025): February
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v22i1.67794

Abstract

Dumai Port is a significant natural port in Sumatra, characterized by deep waters sheltered from waves and calm currents due to surrounding islands. It plays a crucial role in the export of Crude Palm Oil (CPO) and the operations of Pertamina's RU II, which are expected to increase, leading to a rise in ship traffic. In response to this growing vessel traffic, this paper analyzes ship collision frequency and models the dispersion of oil spills as a potential consequence. The ship collision analysis utilizes the Integrated Waterway Risk Assessment Program (IWRAP), combining vessel traffic data over a year with the port's bathymetric data. The analysis revealed a total collision frequency of 0.589766 across various scenarios, including head-on, overtaking, crossing, bending, and merging, which is considered acceptable as it falls below the threshold of one collision per year. Additionally, oil spill trajectory modeling was conducted using two types of oil and two wave heights. In the 2000 m³ oil spill modeling at a height of 0.5 m, the crude oil model showed 68.4% still floating, while the product oil model had 41.7% floating. In the 1.5 m modeling, the crude oil model had 29% floating, and the product oil model had 16.2% floating. Based on these results, the chosen cleanup methods include oil booms, skimming, and dispersants. Effective oil spill cleanup requires collaboration among various stakeholders to ensure the process is carried out efficiently and accurately.
ECONOMIC STUDY OF BLUE SWIMMING CRAB FISHING ACTIVITIES IN JAVA SEA USING ELECTRIC AND SAILING BOAT DESIGN Setiyobudi, Nanang; Santoso, Agoes; Purnamasari, Dian; Muttaqie, Teguh; Muryadin, Muryadin; Noor, Fariz; Setiawan, Ari; Wijaya Kusuma Rahadi, Cakra; Baidowi, Achmad; Rezvani, Rifki; Zarochman, Zarochman
Marine Fisheries : Journal of Marine Fisheries Technology and Management Vol. 15 No. 2 (2024): Marine Fisheries: Journal of Marine Fisheries Technology and Management
Publisher : Bogor Agricultural University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jmf.v15i2.54018

Abstract

The United Nations has proclaimed the world's commitment to reducing greenhouse gas emissions in the Paris Agreement, and Indonesia has a net zero emissions target by 2060. One of the efforts to support this commitment is by applying environmentally friendly fishing vessel technology using sail and electric propulsion. However, to convince the application, it is necessary to consider several aspects, especially the economic aspect of business investment. This study aims to calculate the estimated cost of boatbuilding and fishing operations for 10 days in the Java Sea using the development of electric sailboat design. The payback period of a feasible investment is then calculated by comparing the revenue from Blue Swimming Crab (BSC) fishing activities. Based on the result, recognizing that with an investment value of nearly 400 thousand USD to purchase the boat, it is reasonable to set a minimum goal of capturing at least 1,2 Ton of crabs per trip, and a minimum of 20 trips annually, thus the payback period takes 10 years. Keywords: Blue swimming crab, Fishing vessel, Java Sea, Net zero emission, Payback period.
Co-Authors Achmad Baidowi, Achmad Afandi, Mohamad Imam Agoes Santoso Ari Setiawan Berlian Arswendo Adietya Dian Purnamasari Erwandi Erwandi Handani, Dhimas Widhi I Made Ariana Indiaryanto, Mahendra Malakani, Arga Iman Muttaqie, Teguh Noor, Fariz Noor, Fariz Maulana Prasetyo, Dimas Fajar Putra, Arfis Maydino Firmansyah Rezvani, Rifki Sandjaja, Irfan Eko Setiyobudi, Nanang Wijaya Kusuma Rahadi, Cakra Wijaya, Rio Dwi Sakti Zarochman, Zarochman