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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 6 Documents
 1 
Search results for , issue "Vol 21, No 3 (2024): October" : 6 Documents clear
Theoretical Evaluation of Fuel Consumption in Fishing Vessel Machinery Yaqin, Rizqi Ilmal; Anjaska, Riski; Demeianto, Bobby; Siahaan, Juniawan Preston
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 21, No 3 (2024): October
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v21i3.62863

Abstract

Fuel serves as a crucial element in the operations of fishing businesses employing boats. Presently, the usage of fuel in ships remains significant, yet it lacks thorough mathematical and theoretical assessment. This research aims to evaluate, both mathematically and theoretically, the fuel consumption of fishing vessels during their fishing endeavors. The study involved observations of various aspects, such as engine types, fuel types, and fuel flow, on fishing vessels. Fuel consumption was computed based on operational hours and RPM (Revolutions Per Minute) of diesel engines onboard ships. The findings revealed that engines with identical loads exhibited varying fuel consumption rates due to differences in cylinder volume. Additionally, fuel consumption increased with higher RPM. Fluctuations in fuel consumption during fishing operations were attributed to adjustments made by vessels according to environmental and situational factors. Theoretical and mathematical analyses indicated that several factors, including operational hours, RPM, and cylinder volume, influence fuel consumption in diesel engines of fishing vessels. This study's significance lies in providing insights into the theoretical and mathematical aspects of predicting fuel consumption in diesel engines utilized in fishing vessels.
The Effect of Tip Clearance Kaplan Ducted Propeller in Offshore Supply Vessel (OSV) on Hydrodynamics Winarno, Arif; Sakti, Gedhe Angkoso Nur Sofa; Sugianto, Erik
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 21, No 3 (2024): October
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v21i3.64772

Abstract

A ducted propeller is a modification of a propeller by adding a duct or nozzle. The purpose of using a ducted propeller is to increase thrust, increase propeller efficiency, and encourage better ship movement. This is suitable for Offshore Supply Vessel (OSV) vessels operating on offshore platforms to support oil drilling activities. In designing a kort nozzle, one of the most important components is the tip clearance, the distance between the edge of the propeller and the inner nozzle. The diameter of the kort nozzle can affect the thrust efficiency of the propeller. Due to the blade momentum theory for ducted propellers, the volume of water passing through the propeller should be as large as possible, with the smallest possible flow velocity. In this study, numerical simulations using the Computational Fluid Dynamics (CFD) method were carried out to determine the effect of tip clearance on thrust and torque on a ducted propeller with a MARIN foil 19A nozzle type and tip clearance of 10 mm, 20 mm, and 30 mm. From all models, the highest thrust and torque values were obtained from the nozzle 19A tip clearance 10 mm model with thrust 367,413 kN and torque 315,338 kNm. The relationship between tip clearance and thrust is inversely proportional; the greater the tip clearance, the smaller the value of thrust, and the same is true with torque.
Assessment of Aerodynamic Performance of Darrieus H-Rotor Wind Turbine Using Realizable k–ε Turbulence Model Approach Ariefianto, Rizki Mendung; Fridayana, Elyas Nur; Wardhana, Wisnu
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 21, No 3 (2024): October
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v21i3.65458

Abstract

Wind energy extraction gains more attractiveness as the development of renewable energy progresses and the reduction of fossil fuel usage becomes imperative. Consequently, numerous efforts have been made to enhance turbine performance, such as with the Darrieus H-Rotor type, through numerical studies. Computational Fluid Dynamics (CFD) has become a prevalent tool for these studies, utilizing various approaches, including the eddy viscosity model based on the Boussinesq hypothesis, which underpins turbulence models. This research evaluates the performance of the Darrieus H-Rotor Wind Turbine via 2D CFD modeling using the Realizable k–ε turbulence model. The study also considers simulations with the Double Multiple Streamtube (DMST) model and other turbulence models applied to similar turbine geometries, with experimental data serving as validation benchmarks. Approximately 140,000 cells were utilized in the meshing process to balance simulation duration and the accuracy of the Cp value. The results indicate that the Realizable k–ε turbulence model performs satisfactorily, particularly in producing accurate Cp values in the pre-stall region. The comparison of average Cp values against experimental data across eight tip speed ratio points further supports the effectiveness of the Realizable k–ε turbulence model in simulating the aerodynamic performance of the Darrieus H-Rotor Wind Turbine. Nonetheless, the Realizable k–ε turbulence model fails to enable the Darrieus H-Rotor Wind Turbine to achieve positive Cm values across the entire azimuthal angle at lower tip speed ratios, thus not reaching effective self-starting conditions.
Performance and Vibration Analysis of Electric Outboard Propulsion using Propeller Variations Based on Experiment Iswantoro, Adhi; Raharjo, Juniono; Iwangsa Sima, Yonathan
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 21, No 3 (2024): October
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v21i3.66599

Abstract

The demand for electric vehicles, including electric outboard propulsion for small ship, is on the rise due to growing environmental concerns. To optimize the performance of electric outboards, propeller selection, particularly propeller pitch, is crucial. This research evaluated the impact of varying propeller pitches 8, 9 and 12 degrees on the performance of an electric outboard propulsion. Through both laboratory and field tests, measurements of water flow velocity and thrust, energy consumption, boat speed, and vibration levels were conducted. The objective was to identify the optimal propeller pitch that maximizes propulsive efficiency and minimizes energy consumption. Results indicated that a propeller pitch of 8 degrees produced the highest water flow velocity, implying the greatest thrust. Field tests corroborated these findings, with the 8-degree pitch achieving an average speed of 10 km/h and a roundtrip time of 3.48 minutes. However, the 8-degree pitch also exhibited the highest energy consumption at 0.31366 kWh. Vibration levels were minimal across all pitches, suggesting no structural damage. These findings hold significant implications for the design and selection of electric propulsion systems in small ship, especially for patrol boats.
Study on the Suitability Analysis of the Use of Floating Breakwaters in Palipi Fishing Port Paotonan, Chairul; Paroka, Daeng; Rahman, Sabaruddin; Ashury, Ashury; Assidiq, Fuad Mahfud; Azisah, Nur
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 21, No 3 (2024): October
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v21i3.65156

Abstract

Palipi Fishing Port is a fish landing port with the condition of the dock building facing directly to the open sea without any protection of the port pond. This causes fishermen to be afraid to anchor their ships at Palipi Harbor, especially during the west season. In addition, the condition of the soil bearing capacity at the seabed due to thick sediment deposits in the harbor water area makes it difficult to apply a pile-type breakwater. Therefore, in order to function optimally, Palipi Fishing Port needs to immediately have a breakwater that is suitable for its geographical conditions as a protection from ocean waves. Floating breakwater is the solution due to its floating structure and efficient in reducing waves. This research will identify the suitability between wave occurrence at Palipi Fishing Port and the effectiveness of using floating breakwater while still considering the ease of development so that it is expected that the port can function optimally for regional economic development.
Assessment of the Stability and Response of a Catamaran-Hull Ferry to Operational and Environmental Conditions Santoso, Budhi; Romadhoni, Romadhoni; Ariany, Zulfaidah; Ridwan, Muhammad
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 21, No 3 (2024): October
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v21i3.64789

Abstract

Ship stability is a critical factor in the operation of a catamaran, especially when facing various sea conditions. The catamaran H-192, recently acquired by PT XY, is used as a case study in this research to assess its stability and response to operational and environmental conditions. Stability criteria based on Annex 7 of the High-Speed Craft (HSC) Code are used as the evaluation standard. This research aims to evaluate the stability and response of the catamaran H-192 under various operational and environmental conditions. The primary focus is to ensure that the vessel meets and exceeds the stability criteria set by Annex 7 and to understand how the vessel behaves in real-world situations. The methods used in this research include stability calculations based on Annex 7 and model design using Maxsurf software. The calculations involve the analysis of the righting lever (GZ), metacentric height (GM), and other stability criteria. Operational data and load distribution are analyzed to determine the draft, trim, and stability of the vessel under various loading conditions. The results show that the catamaran H-192 not only meets but also exceeds the stability criteria set by Annex 7. The high values of righting lever (GZ) and metacentric height (GM) at various angles of heel indicate excellent transverse and longitudinal stability. The evaluation of intact stability criteria shows that all parameters achieve "PASS" status, indicating the vessel's capability to handle combinations of heeling forces due to wind, high-speed maneuvering, and passenger crowding very well. The analysis of both full and empty operational conditions shows balanced load distribution and maintained stability.

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