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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 7 Documents
 1 
Search results for , issue "Vol 21, No 2 (2024): June" : 7 Documents clear
Initial Engineering Studies of Battery Capacity Prediction Power of "Electric Ship of FTK UNSADA" Container Concept from Jakarta to Ibu Kota Nusantara Buwono, Ayom; Muslim, Muswar; Irvana, Rizky; Manullang, Shanty; Dariansyah, Ricky; Partahi Oloan, Aldyn Clinton
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 21, No 2 (2024): June
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v21i2.64620

Abstract

Addressing global issues like climate change requires transformative solutions, and the shipping industry is no exception. Moving towards emission-free ship design has become a critical need, offering a chance to significantly reduce greenhouse gas emissions from maritime transport. In 2018, the International Maritime Organization (IMO) adopted a bold strategy to cut these emissions by at least 50% by 2050. Embracing renewable energy sources like batteries, wind, solar, and hydrogen fuel cells is key to achieving this ambitious goal. While electric ships powered by batteries are pioneering the way, meeting the IMO's target will necessitate radical changes in future ship design. Here, Indonesia holds a unique advantage, the legacy of the Sriwijaya Empire renowned for its mastery of wind-powered ships, resonates with this emerging era of green shipping. Abundant sunshine, strong wind potential, and growing expertise in maritime engineering position Indonesia to become a leader in the development and deployment of sustainable ship designs. Harnessing these historical and contemporary strengths, Indonesia can play a pivotal role in revolutionizing the shipping industry. By fostering collaboration between policy makers, researchers, and shipbuilders, Indonesia can spearhead the transition to a future where cargo ships navigate the oceans propelled by the clean power of renewable energy, leaving behind a legacy of environmental stewardship and economic prosperity. This paper estimates the energy consumption and power needs of Container ships on short inter-island routes in Indonesia, with a particular focus on the potential application of batteries in such scenarios. The initial design utilizes similar vessel data collected from various locations around the world. Our findings indicate that a container ship operating on the Jakarta-Semarang route would require batteries with a capacity of 15.25 MWh, Semarang to Surabaya route would require 12.20 MWh batteries, from Surabaya-Tanjung Benoa Bali route required 15.25 MWh, from Tanjung Benoa Bali to Ujung Pandang route require 21.35 MWh batteries, all with a capacity of 1.5 MWh each and from Ujung pandang – Ibu Kota Nusantara require 18.3 MWh. These calculations assume normal sea and weather conditions and a design speed of 10 knots. Implementing battery-powered Containers on these routes reduces the CO2 emission into the air as long as the ship route operates.
Design of Remotely Operated Underwater Vehicle (ROUV) for Underwater Metal Detection Widjaja, Raden Sjarief; Purwanto, Dedi Budi; Trimulyono, Andi; Hafizh, Muhammad Nur Abdullah
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 21, No 2 (2024): June
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v21i2.62767

Abstract

The underwater surveys and inspections in Indonesia were carried out mostly by the operation of practical divers who were limited to shallow waters. The deep - sea exploration requires more advanced technology. The development of underwater technology is required to support many functions of underwater surveys and inspections. The purpose of this study was to design a Remotely Operated Underwater Vehicle (ROUV) for detecting objects with metallic materials. The ROV was designed with a Penta Tubular model and camera assistance for navigation, the JSNSR04T ultrasonic sensor to detect object distances, and the LJ12A3 inductive proximity sensor as a metal detector. ROUV rides are controlled using a keyboard with certain keywords and monitored using a smartphone. Testing the JSN-SR04T Ultrasonic sensor uses 5 variations of distance, namely 20cm, 40cm, 60cm, 80cm, and 100cm, with the detection object in the form of a plate with dimensions of 35cm x 35cm. For testing the inductive proximity sensor, the LJ12A3 type uses 3 variations of materials, namely steel plate, aluminum plates as metal objects, and PVC plates as control materials. Tests were carried out in two mediums, namely in air and underwater. Based on the results of data retrieval testing of the ultrasonic distance sensor in the air, the smallest error percentage is 0.06%, and the highest error percentage is 0.705%. In the underwater test, the error percentage was 0.49% for a distance variation of 100 cm. The ultrasonic distance sensor type JSN-SR04 cannot read distance data below 89.75 cm in water due to differences in the speed of sound propagation in different media. The Inductive Proximity Sensor can work well in air and water mediums with 100% accuracy on steel plates, aluminum plates, and PVC plates.
Numerical Simulation of Sloshing in Different Tank shape with Vertical and Horizontal Baffle Using Smoothed Particle Hydrodynamics Trimulyono, Andi; Adietya, Berlian Arswendo; Alvianto, Jodhy Irsyad; Chrismianto, Deddy; Syahab, Husein
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 21, No 2 (2024): June
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v21i2.64288

Abstract

Computational Fluid Dynamics (CFD) is a numerical analysis used to solve problems related to free surface flows. Two major methods have been developed in the CFD, mesh-based and meshless CFD, in this paper. The meshless CFD approach, Smoothed Particle Hydrodynamics (SPH), is employed. SPH is a meshless method where each fluid is represented by a point or particle. In this study, a 3D simulation was carried out for the phenomenon of sloshing with roll motion in prismatic, square, cylindrical and spherical tanks with a duration of sloshing of 28 seconds. The filling ratio was 25% for all tanks used in this study. Vertical and horizontal baffles were also used to suppress the sloshing. The ratio height of the vertical baffle is 0.9, and the horizontal baffle is 0.2. The results of this study show a successful comparison of dynamic pressure, free surface heights, forces, and moments in various tank variations. The installation of baffles in the tank influences the sloshing phenomenon, especially in the use of vertical baffles, where the vertical baffle is the most effective baffle used in all tanks.
Potential Wind Energy Analysis in Maluku Region with Savonius Turbine using CFD Approach Louhenapessy, Jandri; Simanjuntak, Antoni; Luhulima, Richard Benny
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 21, No 2 (2024): June
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v21i2.62391

Abstract

The Maluku region, also known as the Moluccas, is an archipelago in Indonesia with exceptional wind patterns ideal for wind power generation. Its strategic location between the Pacific and Indian Oceans creates strong and consistent winds due to temperature differences, making it an optimal site for wind energy production. Harnessing wind power in Maluku can significantly benefit Indonesia and the global renewable energy sector by providing a reliable and sustainable energy source to reduce greenhouse gas emissions and combat climate change. Furthermore, the development of wind power in Maluku could create new economic opportunities and incentives for the local community, promoting sustainable development and reducing the reliance on fossil fuels. A study was conducted to assess the viability of wind energy in Maluku, utilizing a Sonius turbine and computational fluid dynamics (CFD) methodology. By varying the center distance between the Savonius blade radius and its rotational axis, researchers aimed to optimize the turbine's design for maximum energy extraction. The simulations showed that turbine model design significantly impacts performance, with Model 2 outperforming Model 1 due to smoother airflow and more efficient rotation. The pressure distribution on the semicircular blades also influenced turbine performance, with Model 1 producing higher force but slower rotation speed compared to Model 2. The simulations showed that Turbine Model 1 produced a higher average force and power output compared to Turbine Model 2. According to the simulations, Model 1 showcased a higher average power output of 66.5 Watts, while Turbine Model 2 only achieved 46.6 Watts. However, Turbine Model 1 had a slower rotation speed due to its larger radius. Under consistent wind conditions, Turbine Model 1 was capable of producing 5.5% more energy than Turbine Model 2. Choosing an efficient turbine model is crucial for maximising the energy production from wind resources. The findings from this study contribute to a comprehensive understanding of the turbine's behavior and can aid in optimizing its design for maximum energy extraction.
Implementation of Indonesian Flag for Electricity Standards on Non-Conventional Vessel at Palipi Harbor Tona, Tasdik; Nurwahidah, Nurwahidah
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 21, No 2 (2024): June
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v21i2.64500

Abstract

This research aims to analyze the current level of application of electricity standards on Indonesian-flagged non-convention ships by Gross Tonnage (GT 7-35), identify the obstacles faced in implementing electricity standards on Indonesian-flag non-convention ships by Gross Tonnage (GT 7-35) and how to make efforts in increasing the application of electrical standards on Indonesian-flagged non-convention ships by Gross Tonnage (GT 7-35). The research method used is a qualitative method with data collection techniques involving observation, documentation, and interviews with related parties. The data analysis technique used is qualitative descriptive analysis. The results show that the electrical condition of non-convention ships varies greatly depending on factors such as ship type, ship size, and the level of maintenance performed. The constraints faced in the implementation of electrical standards on Indonesian-flagged non-convention ships by Gross Tonnage (GT 7-35) are limited resources, understanding and awareness, changes in technology and regulations, and lack of routine maintenance and inspections; and collaboration between authorities, ship owners, and ship crews has not been maximized in the implementation of electrical standards, as well as the absence of training programs or resources offered by related parties to improve understanding and skills related to ship electricity.
Development of Maintenance Scheduling Model for the Safety Operational of Ship Machinery Handani, Dhimas Widhi; Uchida, Makoto
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 21, No 2 (2024): June
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v21i2.61582

Abstract

Risk management of ship machinery is an important issue since machinery out of order can run into danger, especially for ships at sea. This paper implements risk based maintenance (RBM) to minimize the frequency and consequences of ship machinery failure. Not only the common steps of RBM, such as identification of problem, risk assessment, risk evaluation, and maintenance planning are conducted, but this paper also proposes a new model called ship position estimation. The preliminary identification i.e. identification of failure causes and symptoms as well as the history of failure time will be looked at first. In the risk assessment, quantification of the consequences of failure (Cof) considers system performance loss, while the probability of failure (Pof) is obtained from the reliability analysis of the failure time history. Risk evaluation compares the result of the risk assessment with the risk acceptance criteria in order to determine the level of risk. The proposed model of ship position estimation recognizes the ship position on the voyage when the analyzed machinery is in a high level of risk. Maintenance planning is further carried out to keep the machinery under the risk acceptance level. This paper utilizes a method called system dynamics to create simulation for each step of the RBM. As a case study, the parts of the pumps in the main engine cooling system are analyzed. The result of this paper is a proposed maintenance interval which is reasonable enough compared with the standard for pump maintenance. Additionally, the ship position is included when the pump reaches a high level of risk.
Modification of Double Helical Kapiler Pipe to Reduce Temperature in a 100 Liter Capacity Freezer on the Ship Prayogi, Urip; Felayati, Frengki Mohamad; Sugianto, Erik; Syaifuddin, Muhammad Rizal
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 21, No 2 (2024): June
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v21i2.63798

Abstract

The freezer machine is one of the tools on board and serves to maintain the temperature of food ingredients to keep it in good condition and fresh. Given the importance of this, the cooling machine is a tool that functions to make durable foodstuffs by naturally maintaining the temperature. Standard freezer machines produce temperatures only up to -15oC. Modification of the freezer machine needs to be done so that the temperature reaches a lower minus again by changing the capillary pipe from standard to double helical. The purpose of this study is to analyze the effect of double helical capillary pipes on the working performance of a 100-liter capacity freezer cooling machine using R600A refrigerant. In this study the frezzer machine was modified by replacing a single capillary pipe into a double helical. The method used is to conduct experiments to take data to determine the temperature produced and calculate the Coefficient of Performance (COP)  before and after modification. The results of this study are the lowest temperature in the double helical capillary pipe variation during the three-hour test obtained a temperature in the range of -20.2oC while the standard capillary pipe obtained a temperature in the range of -14.9oC. The average COP for standard capillary pipes is greater at 2.773 compared to the COP of double helical capillary pipes which is 2.421. At double helical temperature values are cooler than standard capillary pipes. However, the disadvantage is that the COP of the double-helical capillary pipe is lower than the COP of the standard capillary pipe.

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