cover
Article Per Year (5 Year)
All
Home Page
OAI Link
Editorial Team
Contact
Reviewer
Google Scholar
Contact Name
-
Contact Email
-
Phone
-
Journal Mail Official
-
Editorial Address
-
Location
Kota semarang,
Jawa tengah
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 12 Documents
 1   2 
Search results for , issue "Vol 20, No 3 (2023): October" : 12 Documents clear
System Performance Characteristics of Darrieus Turbine with Tilted Blades in Current and Wave Conditions Suyanto, Eko Marta; Fitri, Sutopo Purwono; Erwandi, Erwandi; Rahuna, Daif; Kasharjanto, Afian
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 20, No 3 (2023): October
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v20i3.54524

Abstract

Indonesia has abundant sources of renewable energy from ocean currents and waves, or a mixture of currents and waves at certain times to be used as an energy source for power plants. So at the Indonesian Hydrodynamics Laboratory, a study has been carried out to determine the performance of the Darrieus-type vertical axis turbine model to utilize the energy of ocean currents and waves. But the Darrieus Turbine with the turbine blades positioned perpendicular to the turbine axis cannot rotate if there is only wave force. Then several turbine models were made with the placement of the blades in an inclined position, to produce optimal rotor rotation in current conditions or a mixture of currents and waves. This paper describes the testing of 3 turbine models by varying the angle of inclination of the turbine blades (45°, 60°, and 75°), but still having the same turbine rotor area and giving different input currents and wave periods to produce the best efficiency and rotation in absorb current energy or a mixture of current and wave energy. The test results show that the 3 models of slanted blade turbines can absorb both wave and current energy, but turbines with 75° blade inclination produce the best performance compared to the others when exposed to currents and waves
Study of the Motion Performance of Marine Current Power Plant Turbine Floaters Due To Ocean Current Forces under Moored Conditions Kasharjanto, Afian; Erwandi, Erwandi; Marta, Eko; irawanto, Zulis; Rahuna, Daif; SJM, Cahyadi
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 20, No 3 (2023): October
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v20i3.58238

Abstract

Indonesia targets carbon emissions to reach 0% in 2060 and is replaced by optimizing the use of renewable energy sources. Indonesia as an archipelago country, with the potential of thousands of straits can be utilized as a source of ocean currents as a source of electrical energy. The electricity generated is obtained from a turbine rotor that rotates due to the force of the ocean current flow. To support the turbine rotor to move in the sea, a floating support structure is needed. In this study, a trimaran tipe support structure is used where on the left and right sides are installed 2 (pieces) turbine rotors @ 50 kW each, so that the total has a capability of 200 kW (@4 x 50 kW). The novelty of this study is the utilization of Trimaran technology in marine current power generation turbines, which has good stability, low resistance, and a wider deck area rather than monohull structures. A numerical study using Computational Fluid Dynamics (CFD) is used to calculate the program. The results showed that the floater only moves backward and then is pulled forward with a small amplitude of movement in the X-direction, while those on the Y and Z axes are insignificant. The turbine floater can be immediately stabilized and the turbine rotor will rotate due to the force of the ocean current received. Therefore, in this study, the marine current turbine using trimaran type is showing good ability to survive in Indonesian waters even in high current areas.
Performance Study of a Humpback Whale Fluke Turbine on Foil Shape Variation Based on Double Multiple Streamtube Model Ariefianto, Rizki Mendung; Hasanah, Rini Nur; Wijono, Wijono; Ridlwan, Asfarur
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 20, No 3 (2023): October
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v20i3.53886

Abstract

Exploration of ocean current energy allows for the development of turbines as the primary conversion device. Turbine technologies have been developed in various types, including bio-inspired turbines, such as the humpback whale fluke turbine. In this study, the achievement of a humpback whale fluke turbine is investigated by applying various forms of foil, both symmetric and asymmetric, to obtain the appropriate foil profile. Symmetric foils were represented by NACA 0012, NACA 0018, and NACA 0021, while asymmetric foils were represented by NACA 4312, NACA 4512, and NACA 4712 foils. Simulations were performed using QBlade software, which was developed based on the DMST theory. In general, symmetric foils have a more stable performance than asymmetric foils because they produce a better performance at positive and negative angles of attack. This result is also supported by a review of efficiency and self-starting capability where symmetric foils have significantly higher CP values and positive CQ along the azimuth angle than asymmetric foils. Finally, NACA 0021 foil is recommended for a humpback whale fluke turbine based on its efficiency and self-starting capability.
Numerical Analysis of The Effects of Propeller High Thrust Distribution on Propulsion System Performance Sandjaja, Irfan Eko; Ariana, I Made; Erwandi, Erwandi; Indiaryanto, Mahendra; Muryadin, Muryadin; Adietya, Berlian Arswendo
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 20, No 3 (2023): October
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v20i3.54715

Abstract

High ship propulsion performance is the main goal of designers, propeller is one component of the propulsion system that also affects the performance of the propulsion. In propeller planning, it is necessary to pay attention to the efficiency of the propeller, in addition to reducing ship operating costs and reducing CO2 gas emissions which is one of the requirements for ships built above 2013, the rules have been made into the Energy Efficiency Design Index (EEDI) standard. At this time the propeller that is widely used is the B Series propeller including the propeller design used on mini LNG ships, namely the B6.40 propeller, the B Series propeller has a pitch character from the Wageningen Propeller Series study. Innovations are made to get better propeller efficiency by varying the pitch distribution. The B6.40 propeller of the standard constant pitch type was modified to B6.40 variable pitch (high thrust). Propellers with high thrust have better efficiency especially for non-fast boats. This study was conducted to obtain the best propeller efficiency of a constant pitch propeller and three high thrust propeller units using Numeca's Computational Fluid Dynamics (CFD) numerical self-propulsion test. For validation of the simulation program by comparing the results of the open water test B6.40 Wageningen while resistance validation by comparing the ship resistance model test. The results of the self-propulsion test using Disc Actuator show that the propulsion coefficient (PC) of Modified-2 and Modified-3 high thrust propellers is better when compared to constant pitch. The magnitude of the increase in PC value reaches ± 4% higher than the constant pitch type on the Modified-3 propeller.
Selection of Propulsion System for Electric Amphibious Bus to Alleviate Traffic Congestion in the Jabodetabek Area Lana, Yuda Safri; Sjamsoeddin, Sjafrie; Ansori, Ansori
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 20, No 3 (2023): October
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/vol%viss%ipp%p

Abstract

High vehicle growth in Jakarta is not balanced with traffic growth, the level of congestion in Jakarta continues to increase every year. To overcome this congestion, innovation is needed to utilize the river as a means of public transportation. The amphibious bus is an alternative public transportation option in the Jabodetabek area to break congestion. The amphibious bus design must be supported by a propulsion system that can operate on land and water. The amphibious bus propulsion system is a must, according to river conditions and operational requirements.  The selection of the drive system is carried out by means of analysis The driving criteria factors needed according to the specifications of the amphibious bus are power, efficiency, size, cost, and maneuverability. These criteria become indicators in determining the type of mover. This study aims to select the prime mover system based on criteria and specification requirements. The selection uses the process hierarchy analysis (AHP) method by giving weight to the criteria for each driver, and type of mover in the water, namely waterjets, azimuth-podded, Paddle Wheels, Cycloidal Propellers and propulsion on land diesel engines, gasoline engines, and electric engines. The results showed that the order of the propulsion selection criteria was propulsion power being the top priority, followed by maneuverability, energy efficiency, cost, operational and investment, and propulsion size and weight. The results of the AHP show that the main options are propulsion systems in water, namely waterjets and diesel engine propulsion systems on land. System Water Jet has a propulsion power of 1000 kW, has high maneuverability, energy efficiency of 85%, and a maximum speed of 60 Km/hour so it can meet the specifications of an amphibious bus drive. For operations on land, the main choice of propulsion system for amphibious buses is a diesel engine with a power of 250 HP and 800 Nm of torque providing strong torque and a wide cruising range. This system has a range of up to 800 km, a maximum speed of 120 km/h, and exhaust emissions of Euro 5.
Advanced Outfitting Techniques for Shipyard Development: A 2000 GT Shipbuilding Case Study Pribadi, Triwilaswandio Wuruk; Wahidi, Sufian Imam; Aziz, Muhammad Naufal
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 20, No 3 (2023): October
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v20i3.53743

Abstract

The shipbuilding sector is currently facing issues due to long manufacturing schedules and delays in ship construction completion. These challenges come from national shipyards' conventional onboard outfitting process for equipment installation, which takes a lengthy time to complete. To address this issue, this study proposes implementing the advanced outfitting system (AOS) approach, which combines the zone outfitting system with the hull block construction method, in building a 2000 GT ship at PT. X in Surabaya, Indonesia. Technical analysis is performed to plan the shipbuilding process using the hull block construction method, and the efficiency of man-hours is calculated by implementing the AOS approach. The study also conducts an analysis of shipbuilding costs and the required shipyard development investment. The technical analysis shows that the AOS approach improves efficiency factors by enhancing material handling and testing activities. The AOS method has an efficiency factor of 50% for on-unit outfitting and 62% for on-block outfitting, compared to on-board outfitting. The construction of a 2000 GT ship employing the AOS approach represents a reduction of approximately 9.6% in working days and a cost-saving of approximately 4.3% when compared to the onboard outfitting method, resulting in savings of IDR 1,933,277,000 or about USD 124,175. To implement the AOS approach, an investment of IDR 3,040,776,000 or about USD 195,310 is required for construction facilities and human resources development. The return on investment is obtained after two 2000 GT ships are completed. As a result, the AOS approach can improve shipbuilding productivity by reducing construction time and costs. This study provides insights into the benefits of implementing modern shipbuilding techniques in the industry.
Cavitation Prevention for Submarine Propeller with Empirical Method Prihandanu, Riyan Bagus; Baidowi, Achmad
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 20, No 3 (2023): October
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v20i3.52960

Abstract

Submarines are a component that is taken into account in assessing the security of a country. Many countries have developed their own types of submarines according to technological developments in that country. To be able to move silently underwater, the most important requirement for submarine propellers is low noise generated by these propellers. So the first thing that must be avoided from the emergence of a noise on a submarine is the absence of cavitation when the propeller operates both on the surface and at depth. The cavitation value can be predicted based on the limits from the burril cavitation diagram. The diagram is obtained from cavitation experiments and recorded full-scale cavitation observations over many years. Simulation calculations will be varied by value of P/D, Ae/Ao, Number of blades (Z) and diameter (D). Other components such as advance velocity (Va) and rotation speed (n) of propeller are considered constant or ignored as in Keller's Formula. From the calculation, by adding the expanded area ratio and propeller diameter values can reduce cavitation in the propeller. While the opposite happens, when the propeller pitch value and the number of blades increase, the cavitation value will also increase. If submarine in dive condition the cavitation difficult to appears, because the pressure of the ship when diving conditions will be very high and the cavitation number will be very small.
Design and Manufacture Ballast Management System Model for Reduce Ship Rolling Motion Yulianto, Totok; Hermawan, Yuda Apri; Widjaja, Raden Sjarief; Purwanto, Dedi Budi; Sulaiman, Suardi bin; Rahmi, Lista Putri Adinda
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 20, No 3 (2023): October
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v20i3.59192

Abstract

The safety of maritime transportation is a critical aspect that must be addressed to ensure the well-being of ships and their crew. Frequent ship accidents highlight the need for improvements in the maritime transportation system. One of the causes of ship accidents is ship instability, leading to a loss of balance and even sinking. Ship stability is influenced by both internal and external factors, including human negligence in observing and addressing ship instability. This research aims to design and create a management ballast system model that can be operated automatically as a solution to reduce ship rolling motion. This system enables the ship to maintain balance using automatic side ballast tank management by utilizing two wing tanks on either side of the ship. The ballast management system will be equipped with an accurate ship roll angle detector, the Initial Measurement Unit sensor, a microcontroller, and a series of actuators, including relays as voltage control switches for the pump motor. This research involves simulation and testing/experiments at various angles, namely 5, 10, and 15 degrees. Simulations are conducted under conditions with and without the ballast management system, which is then confirmed through experiments under the same conditions. The expected outcome of this research is that the created ballast management system can be used to reduce ship rolling.
Enhancing Propulsion Performance for Container Ships through Propeller Adjustments: A Case Study MV. Kendhaga Nusantara 6 Ariany, Zulfaidah; Santoso, Budi; Suharto, Suharto; Sarwoko, Sarwoko
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 20, No 3 (2023): October
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v20i3.58338

Abstract

The ship's service speed performance is prioritized in a ship's propulsion system planning. Motor Vessel. KENDHANGA NUSANTARA 6 is a type of containerized cargo ship built to support the sea toll program in the Tanjung Emas port area, Semarang. The less significant propeller pitch affects the ship's ability to move. The experiment was carried out by operating the machine with maximum capability. The phenomenon of the geometric shape of the propeller provides information on the rotation results and the distribution of the working forces. The structure of the propeller design describes the ability and level of effectiveness when the propeller is submerged in water. The results of this study show that the optimization value of the right propeller pitch is 0.6%, the pitch width is 1660 mm, and the optimization value of the left propeller pitch is 1.2% with a pitch width of 1670 mm; this value can make the ship's rate speed during the docking trial 12.3 knots, following the planned speed.
Proposed Quality Plan for Shipbuilding in Indonesia Based on ISO 10005:2018 Virliani, Putri; Rahadi, Shinta Johar Alif; Rina, Rina; Sari, Dian Purnama; Ismail, Abdi; Maruf, Buana; Bisri, Ahmad
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 20, No 3 (2023): October
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v20i3.58691

Abstract

Ensuring quality is of utmost importance for the shipbuilding sector, as it involves addressing both the quality of processes and the final products to achieve efficient and cost-effective manufacturing. It has become a standard practice for shipyards to adopt certifiable management systems. ISO 9001:2015 sets out the necessary criteria for a Quality Plan, which is influenced by the company's overall quality policy and contractual obligations. In this context, ISO 10005:2018 offers guidance that can be utilized within the framework of quality plans to meet the specific requirements of a project. Several quality plans for Indonesian shipyards, only adopting ISO 9001 and ISO 10005:2018, have yet to be widely implemented. Thus, this paper adopts ISO 10005:2018 to identify the quality plan of three selected shipyards in Indonesia. The gap analysis technique is used to compare the current state of the quality plan with the desired conditions outlined in the ISO 10005:2018 standard. The identified gaps will determine the areas that require immediate attention and improvement in order to meet the requirements of ISO 10005:2018. The primary objective of this study is to facilitate the creation of a quality plan that adheres to the ISO 9001 and 10005 standards. Based on the comparison results of quality plans according to ISO 10005:2018 in shipyards A, B, and C, the recommendation is to integrate distinct clauses (6.4, 6.7.1, 6.7.3, 6.10, 6.13, and 6.15) to improve the quality plans across these specific shipyards.

Page 1 of 2 | Total Record : 12

 1   2 

Filter by Year

2023 2023


Reset
Filter By Issues
All Issue Vol 23, No 1 (2026): Article in Press Vol 22, No 3 (2025): October Vol 22, No 2 (2025): June Vol 22, No 2 (2025): Article in Progress (Accepted Papers) Vol 22, No 1 (2025): February Vol 21, No 3 (2024): October Vol 21, No 2 (2024): June Vol 21, No 1 (2024): February Vol 20, No 3 (2023): October Vol 20, No 2 (2023): June Vol 20, No 1 (2023): February Vol 19, No 3 (2022): October Vol 19, No 2 (2022): June Vol 19, No 1 (2022): February Vol 18, No 3 (2021): October Vol 18, No 2 (2021): June Vol 18, No 1 (2021): February Vol 17, No 3 (2020): October Vol 17, No 2 (2020): June Vol 17, No 1 (2020): February Vol 16, No 3 (2019): Oktober Vol 16, No 2 (2019): Juni Vol 16, No 1 (2019): Februari Vol 15, No 3 (2018): Oktober Vol 15, No 2 (2018): Juni Vol 15, No 1 (2018): Februari Vol 14, No 3 (2017): Oktober Vol 14, No 2 (2017): Juni Vol 14, No 1 (2017): Februari Vol 13, No 3 (2016): Oktober Vol 13, No 2 (2016): Juni Vol 13, No 1 (2016): Februari Vol 12, No 3 (2015): Oktober Vol 12, No 2 (2015): Juni Vol 12, No 1 (2015): Februari Vol 11, No 3 (2014): Oktober Vol 11, No 2 (2014): Juni Vol 11, No 1 (2014): Februari Vol 10, No 3 (2013): Oktober Vol 10, No 2 (2013): Juni Vol 10, No 1 (2013): Februari Vol 9, No 3 (2012): Oktober Vol 9, No 2 (2012): Juni Vol 9, No 1 (2012): Februari Vol 8, No 3 (2011): Oktober Vol 7, No 3 (2010): Oktober Vol 7, No 2 (2010): Juni Vol 7, No 1 (2010): Februari Vol 6, No 2 (2009): Juni Vol 5, No 3 (2008): Oktober Vol 5, No 2 (2008): Juni Vol 5, No 1 (2008): Februari Vol 4, No 1 (2007): Februari Vol 3, No 3 (2006): Oktober More Issue