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Muhammad Akbar Asis
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International Journal of Metacentre
Published by Universitas Hasanuddin
ISSN : -     EISSN : 28098307     DOI : -
Core Subject : Engineering,
Engineering Transportation
The International Journal of Metacentre (IJM) is addressed to scientists and professionals to share their experience, expert knowledge and research results, concerning all aspects of maritime application, technology, engineering, science, and transportation. Focus and Scope Articles that can be published in this journal are the results of research, scientific studies/results of thought, and analysis/problem-solving in the field of naval architecture in particular and maritime and marine technology in general. Scientific articles can be in the form of research results, original research articles, reviews, scientific studies. Based on the focus and scope of the journal, the articles that can be loaded in this Journal cover 10 things (including other fields that are still in relation to marine & maritime technology), namely: Ship Hydrodynamics Ship Design and Production Ship Structure Naval and Marine System Marine Engineering Ship Material Marine Transport Engineering Ocean Renewable Energy Ocean and Offshore Engineering Coastal & Port Management
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 14 Documents
 1   2 
Application of Tensile Testing on Ulin Wood And Bungur Wood as Main Materials for 20 GT Traditional Fishing Vessel Hull Arifuddin, Andi Mursid Nugraha; Alamsyah; Burliyanto, Decky; Suardi
International Journal of Metacentre Vol. 3 No. 1 (2023): June 2023
Publisher : Naval Architecture Departement, Hasanuddin University

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Abstract

Fishing boats in North Penajam Paser are made by combining 2 types of wood in the hull. This combination of wood types is carried out to save the material procurement budget. Bungur wood is the alternative choice for shipyards for hull material combined with Ulin wood. For this reason, this paper shows the differences in the tensile strength performance of these 2 types of traditional wooden ship hull materials. The experimental method of destructive testing of the type of Tensile test was applied in this study. Where the experimental results show that the tensile strength of the crepe is 22% lower than the tensile strength of ulin wood. Meanwhile, in terms of stiffness, crepe wood is superior to ulin wood, where the difference reaches 22.22%. Bungur wood still has the potential to be used for wooden ships with an LoA (length over all) value of <15 meters or for ships that have a lower hydrostatic load than that which can be accepted by Bungur wood.
Experimental Study on Bow Slamming of a Ship Andi Dian Eka Anggriani; Baso, Suandar; Bochary, Lukman; Rosmani; Asis, Muhammad Akbar; Mubarak, Muh Miftach Aqsa; La Ode Gaffar
International Journal of Metacentre Vol. 3 No. 1 (2023): June 2023
Publisher : Naval Architecture Departement, Hasanuddin University

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Abstract

This study discusses about the critical issue of slamming phenomena in ship design, emphasizing its impact on ship safety, environmental concerns, and fuel consumption. The drop tests has been used to investigate bow slamming pressures and internal strain at various drop angle. The results indicated peak pressures at different sensors, with higher drop angles resulting in increased impact pressures and internal strains due to augmented velocity, angular momentum, surface area contact, hydrodynamic effects, and gravitational forces.
Study of Ship Resistance due to Trim using Computational Fluid Dynamics Muhammad Anjas Syam; Baso, Suandar; Ardianti, Andi
International Journal of Metacentre Vol. 3 No. 2 (2023): December 2023
Publisher : Naval Architecture Departement, Hasanuddin University

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Abstract

When a ship experiences trim, the geometric parameters of the underwater ship change compared with even keel condition, such as the ship's draft, length of waterline, and wetted surface area. All these factors affect the ship resistance. The purpose of this research is to understand the influence of trim on ship resistance, and to explain the comparison of ship resistance in even keel, trim by bow, and trim by stern conditions based on Computational Fluid Dynamics analysis.. The method for calculating resistance in this research applies software Autodesk CFD. The type of ship in this study is a container ship. In this study, the hydrodynamic analysis of the ship has been successfully conducted, dynamic parameters such as velocity magnitude, static pressure distribution and resistance have been obtained. The ship model's resistance trim by bow and trim by stern conditions shows a similar tendency, increasing with the trim value. However, when comparing the ship model resistance from each trim condition with the resistance in the even keel condition, there is a difference. The trim by bow condition experiences an increase with an average percentage value of 3.32%. Meanwhile, the trim by stern condition experiences a decrease with an average percentage value of 0.06%. Then, overall, trim by bow condition of -1.441 m shows the highest resistance at 6.044 N and trim by stern condition at 0.5 m has the smallest resistance, which is 5.674 N.
Clustering of Ferry Trajectory Distance Based on Port Class and Ship Technical Specification Asri, Syamsul; Sitepu, Ganding; Idrus, Misliah; Chairunnisa, Andi Sitti; Baso, Suandar; Ardianti, Andi
International Journal of Metacentre Vol. 4 No. 2 (2024): December 2024
Publisher : Naval Architecture Departement, Hasanuddin University

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Abstract

A ferry route connects two ports, between a port and a terminal, and between two terminals at a certain distance. A certain distance is the distance of the ferry trajectory that allows for round-trip ferry services. Ships departing from the port of origin to the port of destination can return to the port of origin on the same day. The trajectory distance (DFT (nautical miles) was once grouped into 8 (eight) distance groups, each connected to the gross tonnage cluster of the ship, namely: the shortest (Group 1): DFT ≤ 1.0 nautical miles; and the farthest (group 8): DFT > 120 nautical miles. The Indonesian Government implemented these distance groups in the period 2003 - 2019. Ferry trajectory distance groups are needed to calculate transportation rates and place ships on a ferry route. This study is intended to evaluate and determine the distance group by the characteristics of ferry transportation services, namely shuttle services. The grouping is based on the class of ferry ports and the technical specifications of ferry ships. The results of this study indicate that one of the eight ferry trajectory distance groups implemented, group 2.4, does not match the characteristics of ferry transportation services (shuttle services). In the distance group, 40.1 ≤ FTD (nautical miles) ≤ 80.0, ferrying or frequency of ship operations is only 1 trip/day. The distance group 2.4 must be changed to 40.9 ≤ DFT (nautical miles) ≤ 70.9 to achieve a ferrying frequency of 2 trips/day. Through this study, eight groups of clustering of ferry trajectory distance are proposed to be implemented by the Indonesian Government. The shortest and longest distance groups, are the first distance group (group of 3.1): DFT (nautical miles) ≤ 2.3; and the eighth distance group (group of 1.2): 101.9 ≤ DFT (nautical miles) ≤ 165.2. Research on passenger perceptions of safety and comfort in relation to the duration of the voyage and the dimensions of the ship needs to be carried out to ensure the grouping of ferry trajectory distances orientation are towards service quality.

Page 2 of 2 | Total Record : 14

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