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INDONESIA
KAPAL Jurnal Ilmu Pengetahuan dan Teknologi Kelautan
Published by Universitas Diponegoro
ISSN : 18298370     EISSN : 23019069     DOI : 10.14710/kapal.
Core Subject : Science,
Earth & Planetary Sciences
Jurnal ini merupakan Jurnal Ilmiah untuk mengembangkan ilmu dibidang Ilmu Pengetahuan & Teknologi Kelautan. Jurnal ini diterbitkan oleh Teknik Perkapalan Universitas Diponegoro 3 (tiga) kali dalam 1 tahun pada bulan Februari, Juni dan Oktober.
Arjuna Subject : -
Articles 408 Documents
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The Prediction of Hydrodynamic Performance of Pinisi Ship Muhammad Akbar Asis; A Dian Eka Anggriani; Fadhil Rahmat Ramadhan
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 20, No 2 (2023): June
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v20i2.49749

Abstract

Pinisi ships are famous for their toughness across the ocean. The uniqueness of Pinisi is shipbuilding methods that are different without design engineering. The conditions present pinisi for tourist ships, problems have arisen recently, namely the number of Pinisi ship accidents. The main cause is bad water and technical factors. To improve safety and comfort, the aspect that needs to be studied hydrodynamic characteristics. The subject ship uses three samples of Pinisi ships produced by the Tanah Beru traditional shipyard. The hydrodynamic performance to be analyzed is hydrostatics, stability, resistance and ship motion, with several methods according to the respective standard to be analyzed. The shape of the pinisi hull is a rounded hull small coefficient block, and the largest change in hydrostatic parameters occurs at a draft of 0 meters to 0.25 meters. The resistance at a speed of 0-7 knots is relatively the same at every speed increase, but at speeds > 7 knots there is a change. RAO analysis for roll motion at a wave frequency of 1.5 – 1.75 rad/s for heading 90 degrees and for 45 degrees 3.65-3.80 rad/s. Heave motion occurs at a frequency of 4.25 rad/s – 4.4 rad/s with a wave direction of 0 degrees and a heading of 90 degrees smaller than the direction of the wave of 0 degrees. Evaluation of the stability arm, for variation KG critical, failed in 5/4H dan 1H in with B/T 3.43 to B/ T 5.00, while for the initial metacentric height parameter, all conditions still passed the criteria. 
Selection Of The Best Ship Route For Container Shipping Optimization Models Using Heuristic Algorithms Jon Mangatas Budiarto Sirait; Gunawan Gunawan; Allessandro Setyo Anggito Utomo
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 20, No 2 (2023): June
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v20i2.51642

Abstract

The role of ships is very important for the world economy as a means of transporting goods both between countries and between islands. The selection of ship routes is very crucial in efforts to optimize fuel costs. Application of optimization, Genetic Algorithm and Ant Colony to solve the Asymetric Traveling Salesman Problem (ATSP) model with the minimum fuel cost objective function. This study aims to determine shipping routes for initial/final destinations with lower fuel costs. The results of research on the best route for container ships develop a Traveling Salesman Problem model for decision making for the design of maritime logistics networks with optimum operational costs. The Ant Colony algorithm provides 8 routes with lower fuel costs than the genetic algorithm and the genetic algorithm provides 2 routes with lower costs than the Ant Colony algorithm. This proves that the Ant Colony algorithm is more effective in determining ship routes with the lowest fuel costs.
Study of Towing Lug Strength in 300 feet Barge at Docking Process Andi Mursid Nugraha Arifuddin; Amalia Ika Wulandari; Mohammad Ardha Wiku Wicaksono
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 20, No 2 (2023): June
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v20i2.52624

Abstract

Currently, the docking of ships or barges has been dominated by the airbag system by relying on the pull of the winch. For the Kalimantan area, the barge is generally pulled using a winch during docking. The structures that play a role when pulling the barge are towing brackets, slings, pulleys, and winches. In this paper, the towing lug will be the object of special discussion regarding its structural strength performance. The towing Lug model used when towing is in the form of an asymmetrical lobe. Two towing brackets are placed on the left and right sides of the bow barge. This towing lug sometimes damaged during towing, so it is necessary to simulate the strength of the towing lug using the finite element method (FEM). A 300 feet Barge is simulated with a total weight (W) of 1200 Tons. The towing lug design structure is made with 3 kinds of models with a varying number of layers and plate thickness. The towing lug design sample used in the existing shipyard is called model 1. While the other modifications to the 2 towing lug structures are called model 2 and model 3. Towing brackets are simulated using a computer with the help of Ansys software. The towing bracket's tensile angle is also varied to obtain a more attractive strength value. The variations of the pull angles used in this simulation are 80°, 83°, 85°, 87° and 90°. From the simulation results, it is obtained that the deformation values in each model show an insignificant level of change. In general, the simulation results also show stress values for each variation that tend to be safe and can be applied when the barge is towed to the dry dock. All equivalent stress values in each condition are still below the material yield stress. However, among the various simulations there are 2 types of conditions that experience stress values that exceed the class allowable stress
Experimental Investigation on the Characteristics of Pitch Motion for a Novel SPAR–type FOWT in Regular Waves Fuad Mahfud Assidiq; Daeng Paroka; Habibi Palippui; Hidayatullah Hidayatullah; Muhammad Fajar Fitra Ramadan
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 20, No 2 (2023): June
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v20i2.52191

Abstract

Pitching mode is more crucial than heaving mode in assessing floating offshore wind turbine (FOWT) motion characteristics, especially the operation of the SPAR substructure. The aim of this paper is to develop an experimental method for improving the SPAR substructure to minimize unnecessary pitch motion. Toward this end, three vertical plate configurations based on the novel SPAR are being developed, known as the 3VP, 4VP, and 5VP models. In consideration of 0⁰, 30⁰, 60⁰, 90⁰-incidence, the pitch response characteristics of the proposed novel SPAR models are comprehensively evaluated in terms of submerged volume ratio, wave-induced motion, non-dimensional damping coefficient, and percentage of motion reduction. The model test results indicate that the 4VP model outperforms the other novel models with respect to dynamic response, particularly the incidence of 0⁰ and 90⁰. This study implies that the novel SPAR development is both feasible and effective in the modification of SPAR-type FOWT substructures.
The Design Concept of an Electric Amphibious Bus as an Alternative Mass Transportation on Rivers and Roads to Overcome Congestion in the Jabodetabek Ardan Nagra Coutsar; Sovian Aritonang; Sjafrie Sjamsoeddin; Ade Bagdja
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 20, No 2 (2023): June
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v20i2.52229

Abstract

Due to the high growth of vehicles in Jakarta that is not balanced by the growth of roads, the congestion level in Jakarta has been increasing yearly. To overcome the congestion, innovation is needed to utilize the rivers as a means of public transportation. The design uses the spiral design method with a parent design approach. The calculations carried out include the calculation of resistance, calculation of motor power requirements, calculation of longitudinal strength, calculation of construction, calculation of weight, hydrostatic calculation, stability calculation and seakeeping calculation on water vehicles. As for road vehicles, the calculations carried out include wind drag calculation, rolling resistance calculation, incline force calculation, total resistance calculation, torque calculation and electric power calculation. As a result of the calculations and iterations carried out, the technical specifications of the amphibious bus are obtained, including a length of 12.0 m, breadth of 3.0 m, depth of 3.0 and draught of 0.8 m. This bus is equipped with three movers of waterjet propulsion connected to electric motors with a power of 710 kW each. This bus can carry 51 people with one driver. This bus has good stability when in the water under empty and full load conditions with a level of comfort that meets ISO standards. In addition, this bus can operate up to 359 km for water distances and 501 km for land distances at 40 km/h for water and 60 km/h for land for one battery charging. This bus can also run with a maximum angle of up to 30 degrees.
Prioritization of Research Vessel Lubricating Oil System Equipment for Maintenance Purpose Using Failure Mode Effect and Criticality Analysis (FMECA) Method. Study Case: RV. Baruna Jaya Tris Handoyo; Dhimas Widhi Handani; Agus Sudaryanto; Dimas Fajar Prasetyo
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 20, No 2 (2023): June
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v20i2.52700

Abstract

Alongside the program, which requires research vessel operation, RV Baruna Jaya is needed to fill that requirement fully. RV Baruna Jaya reported many failures during the previous mission. Some failures need emergency maintenance. One of them is the problem with the lubricating oil system. The lubrication system of an engine supplies of lubricating oil to the various moving parts of the engine. Its main function is to form an oil film between moving parts, which reduces friction and wear. The lubricating oil is also used as a cleaner and, in some engines, as a coolant. During the survey Ina-TEWS in 2021, RV Baruna Jaya was ordered due high temperature of The Lubricating Oil System. The temperature exceeded the normal value, and due to safety considerations, the ME needed to be shut down. Because of this problem, the survey carried out by RV Baruna Jaya was delayed. So, it is important to maintain a lubricating oil system. In this analysis, to maintain the function and performance of the lubricating oil system, the FMECA is carried out. By prioritizing the lubricating oil system equipment using FMEA and Criticality Analysis, 6 pieces of equipment with 24 failure modes should be maintained. These equipment are lubricating oil cooler, lubricating oil pump, engine service oil tank, engine reserve oil tank, Engine lubricating oil standby pump, and lubricating oil transfer pump. The maintenance task is proposed to minimize the occurrence of failure mode, which could possibly happen in the equipment.
Combining Optimum Propeller Design on Roro Ship Re-engine I Made Arina; Adhi Iswantoro; Salsabilla Aulia Fitri
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 20, No 2 (2023): June
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v20i2.52979

Abstract

Passenger ships serve several areas in Indonesia, one of which is KMP (Kapal Motor Penumpang) Dharma Rucitra 3. In 2020 this ship had an accident and almost sank, then causing the main engine to submerge. With this problem, it is necessary to repower with the engine provided by the company, by replacing the old engine with a new engine. The new engine namely Yanmar 6N21A SV with a power of 1200 HP at 850 RPM. Initially the ship's speed was 12 knots with the data of Makita GNLH 630M engine with a power of 1300 HP at 375 RPM with a B4-50 propeller. To achieve the desired speed, it is necessary to have an optimal propeller to improve engine performance. In this research, an algorithm has been specially developed to find the optimum propeller design of B-series propellers for KMP Dharma Rucitra 3 by defining the overall parameters of a propeller like diameter, pitch-ratio, blade area ratio and the number of blades. The optimum propeller design is performed as multi-objective function to constraints imposed by propeller parameters. The computer program has been developed to select the optimum propeller by considering the boundary condition of system, hull-propeller interactions, and engine-propeller matching (EPM). This research also carried out open water and self-propulsion simulations using computational fluid dynamics (CFD). Then it can be concluded that the development of an algorithm to optimize the selection of propellers on KMP Dharma Rucitra 3 obtained propellers with B4-49.6 type with a diameter of 1,995 m so that it can reach a speed of 14,2 knots at 85% maximum continuous rating of engine power. 
Hydrodynamic Analysis of High-Speed Vessels in Shallow and Deep Water Using CFD Budi Utomo; S Samuel; Parlindungan Manik; Chiquita Azaria; Syaiful Tambah Putra Ahmad; Zhang Yongxing
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 20, No 2 (2023): June
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v20i2.52141

Abstract

Differences in the depth of the water surface affect the hydrodynamics of the ship so there is a possibility that the ship will behave differently in deep water and shallow water. The surface flow generated by the hull varies radically due to the speed of the ship and the effects of water depth. At a certain speed, the ship experiences a critical speed condition, which will affect the total resistance of the ship. This study examines the Fridsma ship's resistance to differences in water depth at several speeds. Numerical computation is used in this study to simulate the characteristics of a planing hull form. The Finite Volume Method (FMV) is used to observe fluid flow due to differences in water level with the RANS (Reynolds-Averaged Navier - Stokes) equation in predicting ship resistance. K-ε was modeled as a turbulent and volume of fluid (VOF) model to represent the air and water phases. This study uses a morphing grid mesh to analyze the shape of the hull in numerical simulations. The total resistance of Fridsma in shallow waters increased at each speed when compared to the total resistance in deep waters. On average in deep waters, it can reduce the total resistance by around 22.34% compared to shallow waters. This is caused by the squat phenomenon that occurs in the hull.
Performance Analysis of Terminal II of The New Makassar Container Port in Supporting Logistics Distribution in South Sulawesi Riska Damayanti; Andi Sitti Chairunnisa; Esther Sanda Manapa; Eliyah A.M Sampetoding; Toong Khuan Chan; Misliah Idrus
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 20, No 2 (2023): June
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v20i2.53548

Abstract

The New Makassar Container Port serves as logistics hub that impacts local economic growth and facilitates the distribution of goods between regions. To optimise port operations, it is crucial to establish connections with the hinterland area. Terminal II is designed to handle the flow of containers. According to the current stage of development, the existing capacity and facilities should be able to handle a larger volume of containers. This study aims to evaluate the performance of the logistics system through time and service performance indicators. The research method involves both qualitative and quantitative approaches, with freight forwarders and shipping companies as the sample population. The analysis involves a descriptive analysis of the logistics system and an Importance Performance Analysis (IPA) to assess performance and satisfaction of service users. The Potential Gain in Customer Value (PGCV) method was used to determine priority areas for improvement. The results show that Terminal II of the New Makassar Container Port performs well and meets the standards set by the Director General of Sea Transportation. However, international shipping services have not been fully utilized, contributing to low container flow and underutilization of the installed capacity. Additionally, export activities remain heavily reliant on commodities instead of industrial goods. The IPA and PGCV analyses revealed that the priority areas of improvement include sustainable and customer-oriented operating processes, with a conformity rate of 79% and the highest PGCV value of 6.22. Regular evaluations of both the physical and human aspects of port operations are necessary.
Developed Methodology for Ship Retrofitting (Case Study: RV Baruna Jaya I) Dwitya Harits Waskito; Ahmad Muhtadi; Tris Handoyo; Rio Dwi Sakti Wijaya; Prastya Rizky Ramadhan
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 20, No 2 (2023): June
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v20i2.52957

Abstract

Ship retrofitting is one alternative solution to extend a ship’s life. Several component replacements were performed in the retrofitting process, remodelings to the ship’s main dimension, and state-of-the-art equipment and technology were added. As one of the ships that require regular renewal, especially in research equipment, retrofit processes are often carried out on research vessels. The current problem in the retrofit process for research vessels, especially in Indonesia, is that retrofits are not carried out with established methodology and planning. Thus, some retrofit projects are limited to major repairs and do not extend the ship’s life or performance. To solve that problem, a developed methodology for ship retrofitting was proposed, which consists of selecting the ship and the type of retrofit and its components, determining retrofit requirements, and designing the ship based on the retrofit project. In the design process, a modified spiral design is explicitly used for the retrofit process with some alterations compared with the conventional one, which is focused on analyzing the suitability and availability of space, consumable and tank requirements, analysis of power requirements, risk analysis, and project execution plan. A case study of this developed methodology has been undertaken in the concept design phase of RV Baruna Jaya 1’s retrofit, and the results show that the methodology is considered helpful as an approach for ship retrofitting. Moreover, several considerations were also obtained from the concept design stage and had to be analyzed at the following design stage to meet the retrofit design requirements.

Page 35 of 41 | Total Record : 408

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