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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 359 Documents
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The Selection of Propeller and Primary Engine Matching Level of a 30 GT Fishing Vessel with Analytic Hierarchy Process (Case Study KM Inka Mina 759) Andi Haris Muhammad; Alfin Thariq; Zulkifli Yusuf; Hartono Yudo; M. Yasir
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 19, No 2 (2022): June
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v19i2.46070

Abstract

Reducing fuel consumption and carbon emissions in the development of ship propulsion systems following the required Energy Efficiency Design Index (EEDI) has become a concern for the fishing industry, as determined by the International Maritime Organization (IMO). This study aims to analyze the level of suitability of the use of a 30 GT fishing boat propeller and engine propulsion for optimum propulsion efficiency. The analysis focuses on developing a propulsion system selection model, studying the characteristics of the ship resistance, loading propellers, and selecting the appropriate engine. The engine-propeller matching procedure is used to predict the optimum speed power. Furthermore, the Analytic Hierarchy Process (AHP) method determines the suitability level for the propeller and diesel engine. The results showed the highest level of suitability for the Yanmar 6CH-HHTEC engine versus the A.30X34 type propeller (SP23), with 31.7%. Then the Deutz BF06M1013MC engine versus the B.30X28 propeller type (SP32), the Yuchai YC6A170C engine versus the B30X28 propeller type (SP12), and the Volvo D7ATA engine versus the B30X28 propeller type (SP42) with percentages of 26.6%, 26.4%, and 15.3%, respectively. The high level of SP23 selection is due to the propulsion system having minimal noise levels, dimensions, and engine weight but having maximum power.
Cover V. 19, No. 1 Andi Trimulyono
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 19, No 1 (2022): February
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Numerical Analysis on Added Resistance of a Crew Boat with Variation of Wave Period Dita Adhelia Putri; Muhammad Hafiz Nurwahyu Aliffrananda; Sugeng Riyadi; Sutiyo Sutiyo; I Ketut Aria Pria Utama
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 20, No 1 (2023): February
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v20i1.48615

Abstract

Crew boat is a type of vessels used for the mobility of offshore workers and logistical supply needed for the offshore platform. Crew boat KCT-1901 is categorized as a planning boat with hard chine body. KCT-1901 requires an added power when it is sailing through a seaway. The reason behind this is because when a ship sails through a seaway, the ships experienced a heave and pitch motion resulted in added resistance and hence added power. The goal of the investigation is to estimate added resistance and added power of the crew boat using computational fluid dynamic (CFD) method and tested in calm water and in waves with several Froude numbers (Fr) and wave periods. A method developed by Savitsky is used for verification at high-speed mode. The largest total resistance using CFD in calm water is 38.98 kN and using Savitsky method is 39.00 kN obtained at Fr 0.72. Both are in good agreement and the discrepancy is less than 0.1%. Comparative study was carried out against experimental test in a towing tank. The drag forces tested at Fr 0.12 and 0.24, between the two approaches, showed a discrepancy of about 4%. Further CFD test was conducted on wave pattern analysis, which demonstrated that as the Fr increases the becomes clearer and stronger and tests in waves condition at lower wave period showed that the transverse wave becomes more apparent. Therefore, overall can be said that the CFD simulation showed such a good agreement with empirical Savitsky method and experimental tank test.
On-Bottom Stability Analysis of Subsea Pipelines Based on DNVGL RP F109 Asfarur Ridlwan; Moehamad Syarif Hidayatullah; Elsa Rizkiya Kencana
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 19, No 3 (2022): October
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v19i3.48398

Abstract

Subsea pipeline must be design as stable as possible to prevent failure, considering the external forces from current, wave and soil conditions. Based on these problems, the on-bottom stability analysis needs to be considered in the design of the subsea pipeline by referring to the requirements set out in the DNVGL RP F109 2017. The results of the analysis are the value of hydrodynamic force in the horizontal direction which are 99,916 N/m and 204,358 N/m for installation and operating conditions respectively, while the hydrodynamic force in the vertical direction for installation conditions is 46,852 N/m and operating conditions is 192,232. N/m. The result of absolute lateral static stability analysis, the pipe with a concrete coating thickness of 40 mm both in installation and operating conditions is stable, because it has met the criteria. The result of generalized lateral stability analysis, in installation conditions, the displacement of 0,5 and 10 times of pipe diameter have reached the safety factor. Meanwhile, in operating conditions, the displacement of 0,5 times of pipe diameter has not reached the safety factor, while for displacement of 10 times the pipe diameter is alright. Therefore, the concrete ballast thickness needs to be added to become 44 mm. Modeling using ANSYS CFX software was carried out to obtain the value of hydrodynamic forces acting on the pipe. The result of pipe modeling in installation conditions are 83,578 N/m and 57,13 N/m for hydrodynamic forces in the horizontal and vertical directions. The model is verified and categorized as a good numerology and modeling due to the simple data and information as an input in ANSYS CFX.
Comparative Analysis of Slamming Phenomenon Prediction between U and V Hulls using Strip Theory Method Muhammad Luqman Hakim; Ahmad Firdaus; Gita Marina Ahadyanti; Totok Yulianto
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 19, No 3 (2022): October
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v19i3.46805

Abstract

Choosing the right hull shape is important in designing a ship, for example, a U-section or V-section of the hull. The hull shape will affect various aspects, such as design, resistance, seakeeping, structure and production. The ship hull must be properly designed so that it can operate according to the ship’s mission. From the seakeeping aspect of the ship's motion at sea, the difference in the hull shape will result in different motions and dynamic effects such as the slamming phenomenon. Based on the difference in the hull shape cases, this study analyzed the difference in the probability of slamming between the U and V hulls. Both hulls were made based on Formdata and almost all parameters were made the same. Parameters that cannot be forced to be the same are WSA (wetted surface area),  (coefficient of waterplane area), and  (distance of keel to buoyancy), where those parameters determine the difference in the results. The calculation of RAO (operator amplitude response) was obtained using the strip theory method which assisted by Maxsurf Motion software. The results became the input for the calculation of the slamming probability. The study results show that the U hull has a higher probability of slamming occurrence than that of the V hull, with the difference in values ranging from 20% to 35%. Therefore, the U hull will get more frequent slamming loads, so it has the potential to have a higher structural failure (fatigue) than that of the V hull.
Investigation of Hull Design Modifications on Fuel Consumption and Energy Efficiency Design Index (EEDI) Betty Ariani; Rizky Chandra Ariesta; Rembo Prasetya; Marista Oktaviani; Mohammad Hanifuddin Hakim
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 19, No 3 (2022): October
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v19i3.47029

Abstract

Currently, efforts are focused on reducing emissions to support carbon neutrality by 2050 through green technology. Green technology applies to the ship's design, port, engine selection, fuel, and operation. This study modified the hull to reduce drag and improve fuel efficiency. Changes were made based on variations in the deadrise angle, which were analyzed using numerical simulation. In the current situation, the deadrise angle is changed from 9° to 10°, 15°, and 20°. On the angle variation, the effects of changes in ship drag, fuel, and energy efficiency design index were analyzed (EEDI). The method simulates computational fluid dynamics with a Holtrop calculation method validation approach. At 12 and 6 knots above the current deadrise, resistance is reduced by 8.2% and 6.8%, respectively. The fuel efficiency achieved is 6.9% at 6 knots and 8.2% at 12 knots, resulting in monthly fuel savings of 2.43 tonnes. Furthermore, the phenomenon of the EEDI value at the lowest resistance and highest speed has a decreased performance value. Reducing the speed from 12 to 9 knots improves the performance of EEDI by 66%
Numerical Analysis of Submarine Hydrodynamic Force Near the Seabed Muhamad Ridwan Utina; Rina Rina; Endah Suwarni; Putri Virliani; widodo widodo; Dian Purnama Sari
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 20, No 1 (2023): February
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v20i1.49471

Abstract

One of the aspects that need to be considered in designing a submarine is the effect of the hydrodynamic aspect on resistance and maneuverability in various operating conditions. In certain conditions, submarines operate in conditions near the seabed. In general, submarines are designed to operate in submerge and surface mode. However, under certain conditions, submarines need to operate near the surface of the seabed. Only a few papers or journals have discussed the hydrodynamic aspects of submarines in their operating mode near the seabed. Several methods such as numerical and physical modeling tests can be used to predict the hydrodynamic capabilities of a submarine. This paper discusses the effect of the hydrodynamic aspects that occur in submarines when operating near the sea bed using the numerical CFD method. This method has high flexibility compared to experimental methods and does not require a long time to get the results. In this simulation, a submarine model with a length of 2 m is used.
CFD Simulation Verification Processes at Planing Hulls using An Interceptor Budi Utomo; Samuel Samuel; Serliana Yulianti; Good Rindo; Muhammad Iqbal; Abubakar Fathuddiin
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 19, No 3 (2022): October
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v19i3.48319

Abstract

Experimental test is one of the methods for predicting drag ships using towing tank. This method has a good level of accuracy but requires quite complex equipment and costs. With the advancing technology of computing, the CFD method has emerged as an alternative for problem-solving, especially in hydrodynamics analysis. This study aims to ensure the accuracy of Computational Fluid dynamics (CFD) by verifying experimental data on high-speed vessel using an interceptor. The Interceptor system generates a hydrodynamic lift force by intercepting the flow of water under the hull. Comparison of experimental results and numerical simulations will involve analysis of drag, heave and trim. Numerical simulations were carried out using ITTC recommendations as testing standards. This research uses the grid independence study method to ensure the accuracy of the mesh. CFD simulations were carried out using the overset mesh method and the k-epsilon to solve turbulence flow. The Dynamic Fluid Body Interaction (DFBI) module is employed to resolve the dynamic motion of the ship in order to assess hull movements based on by fluid forces and moments. There can be two degrees of freedom in the heave and pitch directions. All simulations are performed in calm water condition. Verification is carried out by reviewing the condition of the ship without an interceptor and with an interceptor. 100% stroke and 60% interceptor were used as variations of the verification of this study. The results of this study indicate that the CFD analysis has been verified by the experimental method with a maximum error range of 10.7%. Planing hull is a type of fast ship that has quite complex hydrodynamic characteristics. This study also shows that the use of interceptors is proven to improve the performance of the planing hull ship. 
Failure Analysis of Fuel System Main Engine Fishing Vessel (Case Study : KM. Sumber Mutiara) Rizqi Ilmal Yaqin; Mohamad Akmal; Juniawan Preston Siahaan; Mega Lazuardi Umar; Bambang Hari Priyambodo; Yuniar Endri Priharanto
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 20, No 1 (2023): February
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v20i1.48530

Abstract

Failure analysis on the fishing vessel's main engine is one of the works that must be completed because it is crucial for the operation of the ship. Analysis of determining the cause and effect of the failure main engine fuel system is the goal of this study. FMEA (Failure Mode and Effect Analysis) is a method used to determine priority components in failure. The use of Pareto diagrams is an additional method of analysis. RCFA (Root Cause Failure Analysis) is used to analyze the root cause of the failure of the main engine fuel system. The results obtained are the injector component (168) is the component that has the highest RPN value and is the largest contributor to failure according to the Pareto diagram. The root of the failure identified is the lack of checking before operating. The results of the recommendations obtained are the use of corrective maintenance based on the RPN value and the use of a clean filter for the fuel system. The injector is a component that needs to be maintained so as not to experience a fuel system failure on the main engine. The impact of the results of this study is that it becomes a scientific finding using FMEA and RCFA as a method of analyzing failures in the main engine fuel system on fishing vessels
Design of a Semi-Submersible Tourism Ship for Bunaken Underwater Recreation in Manado, Indonesia Wasis Dwi Aryawan; M Hafiz Nurwahyu Aliffrananda; Danu Utama; Hasanudin Hasanudin; Yuda Apri Hermawan
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 19, No 3 (2022): October
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v19i3.46629

Abstract

With a rapid increase in various number of marine tourism destinations, especially in The Bunaken National Park with the amount of tourists that has increased throughout the year rising by 23% for domestic tourists and 12% for international tourists between 2002 and 2018. Unfortunately, to enjoy the underwater scenery of The Bunaken National Park can access by diving and snorkeling which is not all tourist can do that. Furthermore, in order to support the marine tourism industry in Indonesia, a semi-submersible tourism ship was developed with a glass at the hull's bottom based on the standard spiral design and the safety standard established by the rules so the tourists can easily enjoy the underwater ecosystem. The concept design of bottom-glass ship with trimaran hull type is offered as a problem-solving in this paper. The final design of the main dimensions are length of overall (LOA): 23,1 meters, width (B): 8 meters, Draft (T): 2.22 meters but the maximum submerged up to 2,5 meters, speed of 10 knots, and passenger capacity of 44 persons.

Page 33 of 36 | Total Record : 359

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