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All Journal Journal TEPAT: Teknologi Terapan untuk Pengabdian Masyarakat International Journal of Metacentre Jurnal Riset & Teknologi Terapan Kemaritiman
Ardianti, Andi
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Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Energy Engineering Mechanical Engineering Public Health Transportation

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Journal : International Journal of Metacentre

 1 
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 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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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.
Co-Authors ., Misliah Akbar Azis, Muhammad Asis, Muhammad Akbar Chairunnisa, A. Sitti Chairunnisa, Andi Sitti Clausthaldi, Fadhil Rizki Clauthaldi, F. R. Djafar, Wihdat Djalante, A. H. Djalante, Abd. Haris Fachruddin, Farianto Firmansyah, M. Risal Firmansyah, Muhammad Rizal Fitrah, Rifkah Ganding Sitepu Hamzah Haris Djalante, Abdul Lukman Bochary Mahendra Amir, Ihza Matemmu, Jeferi Misliah Idrus Muhammad Anjas Syam Mustafa, Wahyuddin Riski Clausthaldi, Fadhil Rosmani St. Chaerunnisa, Andi Suandar Baso Syamsul Asri Wahyuddin Wahyuddin