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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 
Design of Shipping Lanes at Tanjung Ringgit Port Palopo City
International Journal of Metacentre Vol. 2 No. 1 (2022): June 2022
Publisher : Naval Architecture Departement, Hasanuddin University

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Abstract

One of the things that should not be left behind in the port development process is the availability of shipping lanes. The shipping lane is used to direct ships that will leave/enter the harbor pool. The shipping lane must have sufficient depth and width or in accordance with the draft of the ship so that it can be passed by ships that will use the port. This study aims to determine the characteristics of the shipping lanes in accordance with the needs of the ship and determine the location of the appropriate and efficient shipping lanes at Tanjung Ringgit Port, Palopo City. The method used to design the shipping lanes of Tanjung Ringgit Port, Palopo City, is by observation/survey, interview, and document study. The results of this study indicate that there is a navigational hazard, namely seaweed ponds for local residents, therefore the addition of Sailing Navigation Assistance Facilities in the form of 3 units of Red Flare Buoys. The depth at the entrance of the Tanjung Ringgit Port, Palopo City, starts from 9 meters – 23 meters with a channel length of 6,074 meters and a channel width of 300 meters so that a route system for the inlet and exit routes is made with a 2-way route system. Based on these results, the size of the ship with a DWT of 8000 tons, a maximum draft of 8.1 meters with an LOA of 100 meters that can enter and leave the shipping lane. The depth of the waters in front of the pier of Tanjung Ringgit Port, Palopo City is 7 meters. There is a water area for the activities of the main facilities for port services, namely, Swivel Pool, Ship to Ship Area, and Freight Ship Anchoring Area. And there are water areas for port service supporting facilities activities, namely, Dead Ship Area, Sea Trial Area, Emergency Area, Reserve Area. Keywords: Area; Shipping Line
The Optimal Capacity of the Handling Facilities in Bitung Container Terminal
International Journal of Metacentre Vol. 2 No. 1 (2022): June 2022
Publisher : Naval Architecture Departement, Hasanuddin University

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Abstract

The Bitung container terminal as the international hub port experienced an increase in the growth of container flow and ship call from 2014 to 2019, wherein the average increase was 8% and 4%, respectively. In 2018, the increase of ship calls was significantly high about 25% compared with the ship call in 2017. One of the important port facilities, to support the loading and unloading activities for the container, is the container handling types of equipment that are used for container handling from ship to port, port to the container terminal, and in the container terminal itself. The aims of this study are to analyze the productivity performance of the container handling equipment in the Bitung container terminal by considering the growth of container flow and to determine the optimal capacity of the container handling capacity for the expected year in 2035. The container handling equipment that was investigated is a container crane (CC), rubber-tired gantry (RTG), and head track (HT). The combination of the qualitative and quantitative methods is used for analyzing the productivity, and the regression method is used for predicting the growth of the container. Also, the optimization method is used for determining the optimal capacity of the container handling equipment. The research results revealed the productivity of CC, RTG, and HT were 25 boxes/hour, 27 TEUS/hour, and 24 TEUS/hour, respectively. In addition, the optimal capacity of CC is one unit for the short term (2025) and mid-term (2035). The optimal capacity of RTG is two units for the short-term (2025) and mid-term (2035). For the HT, the optimal capacity is two units for the short-term (2025) and mid-term (2035).
The Design of Digital of information System For Shipbuilding Proccess : Current Condition of Medium Shipyard
International Journal of Metacentre Vol. 2 No. 1 (2022): June 2022
Publisher : Naval Architecture Departement, Hasanuddin University

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Abstract

In the era of the industrial revolution 4.0, information technology is developing very rapidly so that it is now easier to design an information system that can facilitate aspects of work. The ship production process in a shipyard involves complex information. It's the necessary information to keep the shipbuilding project progress with the Plan. Unclear information at least one of the stages in the ship production process will delay project completion and affect costs. Manually distributing important information about the shipbuilding process to related departments takes time. Therefore, it directly affects the duration of the project. A digital information system for the shipbuilding process is needed to overcome these problems. Therefore, it is necessary to develop an integrated information system that functions to facilitate the flow of information between divisions related to the ship production process in the form of digitization. Based on this, there has been no digitalization of information system integration related to production materials in the design division (Engineering), purchasing division, material warehouse division and production division. Therefore, before the digital information system can be developed further, it is necessary to identify and formulate the flow of information between departments. Therefore, this study aims to identify and formulate information and flows to the four divisions in the ship production process .
An Experimental Study on Stern Slamming of a Ship with Steel Model
International Journal of Metacentre Vol. 2 No. 1 (2022): June 2022
Publisher : Naval Architecture Departement, Hasanuddin University

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Abstract

This study discusses the phenomenon of experimental-based slamming carried out on a towing tank using a piezo sensor placed on a 0.15 L plane measured from the AP. This research measures the pressure on the ship's hull and internal strain with a steel model. This study aims to determine the amount of pressure and distribution on the ship's hull and the internal strain that occurs. This study's results indicate that the value of internal stresses and strains increases with each increase in the aft angle given in the drop test. The greatest pressure occurs at sensor 2 in the bottom area, which first touches the water surface with an average increase in pressure of 23.89% and internal strain occurs at sensor 6 in the ivory construction at the stern of the ship with an average increase of 24.49% so that These areas need special attention in Typical frame section location for stren slamming and structure of the ship to minimize the damaging effects of the slamming phenomenon.
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.
Study of the Impact of Biofouling on Ship Resistance Using Autodesk CFD Rosmani, Rosmani; Baso, Suandar; Saputra, Heri; Asis, Muhammad Akbar; Bochary, Lukman; Chalil, Sopyan
International Journal of Metacentre Vol. 3 No. 1 (2023): June 2023
Publisher : Naval Architecture Departement, Hasanuddin University

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Abstract

Biofouling, the accumulation of marine organisms on ship hulls, poses a substantial challenge in the maritime industry. Over time, organisms like algae and molluscs adhere to hull surfaces, creating a biofouling layer that disrupts water flow and increases ship resistance. This study investigates the effects of biofouling on ship resistance and fluid flow patterns along the hull. Data collection involved measuring key ship dimensions, analyzing ship lines plan drawings, and measuring biofouling thickness. Autodesk Computational Fluid Dynamics (CFD) software was used to calculate ship resistance and analyze fluid flow along the hull. Two conditions were compared: a hull without biofouling and a biofouled hull. At a speed of 1.220 m/s, the biofouled ship model exhibited a resistance of 3,739 N, while the clean hull had a resistance of 3,280 N, indicating a 13.642% resistance increase due to biofouling. Fluid flow analysis revealed complex flow patterns along the biofouled hull, potentially reducing operational efficiency. These findings underscore the importance of biofouling prevention and control measures in minimizing resistance and maintaining operational efficiency. A deeper understanding of fluid flow characteristics related to biofouling allows ship operators and companies to make informed decisions about vessel maintenance, reducing environmental impacts and operational costs. This research contributes to addressing biofouling challenges in the maritime industry.

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