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Muhammad Akbar Asis
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akbar.a@eng.unhas.ac.id
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+6282333278030
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ijm-nasp@unhas.ac.id
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Jl. Poros Malino KM.6, Gedung Perkapalan A, Fakultas Teknik, Kampus Gowa Unhas
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INDONESIA
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 5 Documents
 1 
Search results for , issue "Vol. 2 No. 2 (2022): December 2022" : 5 Documents clear
Characteristics of SPOB Ship Hull Block Design Based on the Plate Supply Requirements Mustafa, Wahyuddin; Asri, Syamsul; Fachruddin, Farianto; Rizal Firmansyah, Mohammad; Rizki Clausthaldi, Fadhil; Rijal, Ahmad; Jafar, Jasman; Mega Putra, Adzan
International Journal of Metacentre Vol. 2 No. 2 (2022): December 2022
Publisher : Naval Architecture Departement, Hasanuddin University

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Abstract

The main process of shipbuilding consists of several stages of work, including design, fabrication (cutting, shaping or forming), block assembly, outfitting, painting, erection, and work on the pier. The block assembly system is very efficient to be used in a ship production process in modern shipyards. In this system, the assembly's efficiency and productivity depend on the design of the block division; hence, it requires an appropriate design. Generally, the feasibility of the block division design still relies heavily on the expertise of experienced designers who has extensive knowledge of shipbuilding. This study uses 2 (two) block division designs which are based on a plate length of 20 feet (6069 mm) and 30 feet (9144 mm). Based on the division, the characteristics of the blocks' weight, number, dimensions and the number of supply plate material requirements can be obtained. The results show that the characteristics of the weight, number and dimensions of blocks for each plate reference length are different. The total material needed for each design is 773,028 kg and 907,212 kg. The effectiveness of supply material requirements for the design with 20 feet plate is better than the design for 30 ft plate, which is 0.31 compared to 0.41.
A Concept Design of Training Ship in Indonesia Waterway: Toward A Type of Passenger-Container Vessel Rusi, Rusnaedi; Fitriah, Rifkah; Pettarani, Amrin; Rusi, Sudarman; AM, Andi Rachmianty; Baso, Suandar; Asis, Muhammad Akbar
International Journal of Metacentre Vol. 2 No. 2 (2022): December 2022
Publisher : Naval Architecture Departement, Hasanuddin University

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Abstract

In the future, the seafaring profession will face some tough challenges. In order to address the challenges, the Maritime Vocational Education (MVE) is required to produce graduates with appropriate competencies related to the perspective of international trade in the shipping sector based on the Standards of Training, Certification and Watchkeeping for Seafarers (STCW). In order to improve the skills of students, a training ship is needed by maritime vocational education as a real practice for students. This study describes the concept of training ship design for maritime vocational education with consideration of Indonesian waters. The design concept starts with selecting the type of training ship, determining the capacity of the training ship, determining the main dimensions of the training ship design. Making line plans, making General Plan Drawings, calculating ship resistance taking into account Indonesian waters and determining the driving force of the main engine of the training ship as well as calculating the stability of the training ship. This design was applied to the AMI Makassar Maritime Polytechnic as a case study. The results showed that the type of Passenger-Container Vessel. The capacity of the training ship is around 150 students with a container load capacity of 8 TEUs. The main dimensions of the training ship design are the length between perpendicular (Lbp), width (B), height (H), and draft (T) respectively 69.23 m, 12.00 m, 5.50 m, and 2.54 m with Gross Tonage and ship engine power of 1.404,84 GT and 1090,7 Kwatts. The main dimensions of the training ship design are also corrected with the main dimension ratio parameters, geometric shape coefficients, weight and initial static stability.The seafaring profession will face some tough challenges today and in the future. Accordingly, Standards of Training, Certification and Watchkeeping for Seafarers (STCW)
Experimental Test of Tensile Strength of Barge Deck Plate Welded Joints Alamsyah; Indah Sari, Fitria; Arifuddin, Andi Mursid Nugraha; Pawara, Muhammad Uswah; Mubarak, Azhar Aras; Hijriah
International Journal of Metacentre Vol. 2 No. 2 (2022): December 2022
Publisher : Naval Architecture Departement, Hasanuddin University

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Abstract

American Standard Testing and Material (ASTM) A36 is a low carbon steel, and commonly used as material of shipbuilding. Joining of steel can cause decreasing of its strength. The purpose of this study was to determine the tensile strength of joints of ASTM A36, consisting of square butt, single bevel butt, and single vee butt joints. The  research methode is experimental.  The specimens are made of steel for the ship's decks, which are connected using three types of joints. Each type of connection involves as many as three specimens, so there are a total of nine specimens. Before the tensile test is carried out, the specimen is subjected to a penetrant test to detect weld defects. It was detected that the specimen had broken off at the weld joint. The experiment result shows that the strongest joint from tensile strength point of view is single vee butt joint (198.80 MPa), followed by single bevel butt joint (182.19 MPa) and, square butt joint (168.51 MPa).
Analysis of Operational Performance of Fishery Port Tanru Sampe Jeneponto, South Sulawesi Idrus, Misliah; Chairunnisa, Andi Sitti; Djafar, Wihdat; Djalante, Abdul Haris; Fitriah, Rifkah; Sabir, Sabnur
International Journal of Metacentre Vol. 2 No. 2 (2022): December 2022
Publisher : Naval Architecture Departement, Hasanuddin University

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Abstract

The fishing port combines fishing activities at sea and distribution activities to consumer areas. The fishing port must guarantee the needs of ships that dock and land and ensure that the landed catch remains of good quality. The Tanru Sampe Fishing Port in Jeneponto Regency, South Sulawesi Province, is a type D Fish Landing Base (PPI) with a pier length of 45 m, a pool depth of around 0.5-4 m, an operating vessel capacity of 19-24 GT, and loading and unloading time of around 4 -5 hours. The condition of limited depth and long loading and unloading time causes the frequency of fishing to be less optimal. The research aims to analyze the port's performance using parameters based on the standards of the Director General of Capture Fisheries Number 20/KEP-DJPT/2015. The results of the study show that the performance of the port is generally of moderate value, with assessment parameters: 1) Administration and information of three variables, only one good variable, namely the availability of human resources, 2) Port facilities of six variables, only four variables have good value, namely the length of the pier, the depth of the pool, the completeness of marketing and distribution facilities, and the availability of portland. 3) Four out of nine variables for general services are good: mooring services, fishery production, frequency of ship visits, and ice distribution. n In investment and industry, there are three good variables: port land use and employment.
Analysis the Influence of Sling Direction on Pad Eye Strength Ardianti, Andi; Hamzah; Sitepu, Ganding; Mahendra Amir, Ihza
International Journal of Metacentre Vol. 2 No. 2 (2022): December 2022
Publisher : Naval Architecture Departement, Hasanuddin University

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Abstract

One of the stages of ship production using the grand block system is the erection process, where in this process the blocks weighing up to million Tons will be lifted. This study aims to see whether the sling angle used in the block lifting process will produce different stresses, strains, and deformations in the pad eye. Sling angle variations used in this study are 45°, 60°, 75° and 90° with a tensile load of 55 tons or 539365.75 N. This research was conducted using the finite element method and assisted by ANSYS software. Based on the results of the analysis, the maximum X-axis normal stress is 57.85 MPa which occurs at a sling angle of 45°, the maximum Y-axis normal stress is 143.32 MPa which occurs at a 90° sling angle, the maximum XY shear stress is 51.712 MPa which occurs at a sling angle of 45° and a Von-Mises stress of 151.47 MPa which occurs at a sling angle of 90°. As for the shear strain XY, the maximum strain that occurs at an angle of 45° is 6.4 x and for the maximum Von-Mises strain occurs at an angle of 90° by7.4 x . And the maximum total deformation value is obtained by7,286 x mm that occurs at a sling angle of 45°.For each variation of the sling angle used, the strength of the pad eye still meets the classification requirements because the resulting value is still below the permissible value. The difference in the results obtained after using variations in the angle of the sling shows that the difference in the direction of the pull of the sling has a different effect on the strength of the Pad eye.

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