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 408 Documents
 29   30   31   32   33 
Numerical Investigation of the Effect of Biodiesel-Biogas Percentage on Performance Characters and Dual Fuel Engine Emissions as Green Technology on Ship Betty Ariani; Dedy Wahyudi
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 | DOI: 10.14710/kapal.v19i1.44125

Abstract

The discourse on the application of green technology in the maritime sector is an interesting agenda to implement. The development of the world of shipping transportation which continues to experience an increase in numbers and services creates new problems in terms of fuel supply and the resulting emissions. So that the development of innovation and technology for ship machinery should be directly related to fossil fuel substitution technology, operational efficiency technology, improving performance and reducing emissions from the engine itself to be achievements and targets. Good engine performance directly has an impact on increasing the operational efficiency of the ship and being a good carrying capacity in the environment with minimal emission levels. A dual-fuel engine is one of the engine system concepts that has several advantages, such as simple and relatively easy modifications and the use of natural gas which tends to be cleaner. Biodiesel and biogas are examples of alternative fuels that are expected to be promising solutions for marine engineering. This research uses a numerical study on the application of dual fuel engines, the percentage of biodiesel-biogas is carried out with variations of 50:50 and 25:75, at a constant engine speed of 2200 RPM. Simulations were carried out to see the results of how the engine performance, cylinder pressure, heat release rate and HC and NOx emissions were at a constant speed variation of the fuel percentage test NOx emission decreased at a higher biogas percentage, for UHC it increased at a higher biogas percentage, it is possible to add oxygen intake through a turbocharger or supercharger as an auxiliary equipment.
A Bamboo-Hybrid-Slat Laminate of Fishing Boat: Materials Selection, Scantling Calculation and Construction Cost Supomo, Heri; Djatmiko, Eko Budi; Supomo, Wikaranosa; Permana, Rizki Dian
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 18, No 3 (2021): October
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v18i3.41559

Abstract

Abstract. Bambusa Arundinacea slat lamination has relatively high tensile and flexure strength, while Pterocarpus Indicus has relatively lower than. These two types of bio-materials are very cheap, easy to cultivate, fast growing, and renewable material. For this reason, hybrid slats lamination of Bambusa Arundinacea and Pterocarpus Indicus was chosen as a construction material for fishing boats to substitute solid Teak wood which is increasingly rare and expensive. Based on the results of the tensile and flexural strength tests show that the configuration of the hybrid laminated with the parallel slats has the highest tensile strength (114.636 MPa) and flexural strength (111.606 MPa). These two strength values are used to calculate the 20GT fishing boat scantling in accordance with the Indonesian Classification Bureau vol vii 2013 regulations. By using the hybrid lamination material of Bambusa Arundinacea - Pterocarpus Indicus slats, the scantling of 20GT fishing boat will be slightly smaller, the volume of material needed is 28.7% lower and the construction cost 40.66.% less than Teak wood material.
Influence of Stress Concentration Factor due to Scallop Form on the Wrang Plate Stucture Riska Arum Dona Kusnadi Putri; Totok Yulianto; Rizky Chandra Ariesta; Mohammad Nurul Misbah
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 | DOI: 10.14710/kapal.v19i1.43344

Abstract

The presence of opening in construction is unavoidable for the purpose of reducing stress. A small opening at the construction serves as access to continue the installed construction that runs through the web or girder. However, the presence of the hole also creates an unavoidable problem, the concentration of stress in the area around the hole that will gradually reduce the strength of the ship's construction. Stress concentration occurs due to changes in geometry, causing the flow of stress initially uniformly driven and following the existing geometry. This analysis aims to determine the value of stress concentration factors on the wrang plate due to variations in the shape of scallops. The research method is performed numerically using finite element analysis to find variations in the model with the lowest stress concentration factor. This variation consists of 3 different scallops models with 2 load, drag and press conditions. The values of stress concentration factors are grouped into 3 modes according to mechanical fractures in press loading conditions. Based on the analysis of panel models with compressed loads, it can be seen that model III has the smallest stress concentration factor value in case modes I and III but for mode II the value of the smallest stress concentration factor in model II.
Fatigue Analysis of 5000 GT Ferry Ro-Ro’s Car Deck Using Finite Element Method Wulandari, Amalia Ika; Rahmasari, Nindy widia Devi; Adnyani, Luh Putri; ,, Alamsyah; Ikhwani, Rodlian Jamal
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 18, No 3 (2021): October
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v18i3.39268

Abstract

Ro-Ro Passenger Ship type crossing ship is a ship that is operated to connect 2 (two) ports. On the Ro-Ro ship there is a car deck as one of the vital construction structures, because it is used to support the vehicle load on it. This study aims to determine the value of fatigue life in car deck construction by reviewing hot spot stress areas that are prone to cracking. The value of the fatigue analysis is taken from the greatest stress value and the shortest cycle is taken at each plate thickness variation. The method used is the finite element method (FEM) by varying the thickness of the car deck plate assisted by using finite element based software. The results showed the highest maximum stress was found on car deck 1 with a thickness of 80% (9.6 mm) which was 241.16 Mpa, while the lowest minimum stress was found on car deck 2 with a thickness of 110% (13 mm) which was 103.07 Mpa. The highest value of fatigue life is found in car deck 2 with a plate thickness of 110% (13 mm) of 74.23 years with a stress cycle of 1350000 times, while the lowest fatigue life value is found in car deck 1 with a plate thickness of 80% (9.6 mm) of 7.63 years with a voltage cycle of 220000 times
Analysis of Performance, Emission, Noise and Vibration on Single Cylinder Diesel Engine After Installing Dual Fuel Converter-Kit Based on ECU Adhi Iswantoro; I Made Ariana; Muhammad Syuhri
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 | DOI: 10.14710/kapal.v19i1.44126

Abstract

Now the demand for fuel oil has increased, this can cause fuel oil reserves to be depleted. To reduce the use of fuel oil, alternative energy is needed. One alternative energy that can be used to reduce fuel oil consumption is LPG (Liquid Petroleum Gas). The use of alternative fuels for LPG in diesel engines is done by converting diesel engines into dual fuel. This research aims to determine the effect of using dual fuel that are LPG-Diesel fuel on engine performance including power, torque, fuel consumption, emissions, vibration and noise. The research was conducted using a Yanmar TF 85 MH engine at 2000 RPM engine speed with variations in loading of 1000, 1500, 2000, 2500, and 3000 watts, and dual fuel with variations in injector openings of 3ms, 4ms, 5ms. Based on the research results, the use of LPG in dual fuel system with installing ECU (Electronic Control Unit) converter-kit, can replace diesel fuel oil consumption up to 93%. In the use of dual fuel there is an average decrease in power and torque of up to 1.95% if using only diesel fuel have average power up to 2.32 kW and torque up to 11.09 Nm. When using dual fuel there is a decrease in specific fuel oil consumption by up to 44% when using only diesel fuel have average fuel oil consumption up to 414.15 g/kWh. The maximum NOx emission produced is 1.83 g/kWh for a 3ms gas injector opening, 1.48 g/kWh for a 4ms gas injector opening, and 1.81 g/kWh for a 5ms injector opening. The maximum vibration generated is 33.2 m/s² for a 3ms injector opening, 31.4 m/s² for a 4ms injector opening, 27.46 m/s² for a 5ms injector opening, and when used only Diesel Fuel is 32.8 m/s2. The maximum noise generated is 92.33 dBA for 3ms injector opening, 92.43 dBA for 4ms injector aperture, 93.20 dBa for 5ms injector aperture, and 91.73 dBa when using diesel oil only.
Longitudinal Strength Analysis Considering the Cargo Load on Very Large Crude Carrier (VLCC) Suci, Indah Melati; Sitepu, Ganding; Muis Alie, Muhammad Zubair
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 18, No 3 (2021): October
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v18i3.42349

Abstract

The ultimate strength of the Very Large Crude Carrier (VLCC) is an important aspect that must be analyzed. The purpose of this study was to analyze the ultimate strength of the VLCC ship in terms of deformation under hogging and sagging conditions on the deck and bottom. Deformation is a change in the shape or size of a material due to a workforce that is applied to you. In this case, the deformation in question arises due to the working moment. This deformation analysis was carried out using the Non-Linear Finite Element Analysis (NLFEA) method. This analysis is carried out by presenting the support or Multi-Point Constraints (MPC) in the cross-section, as well as moments of 6.52 × 1012  for hogging conditions and -5.5 × 1012  for slack conditions.
Back-matter V. 18, No. 2 Andi Trimulyono
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 18, No 2 (2021): June
Publisher : Department of Naval Architecture - Diponegoro University

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

Abstract

Cover V. 18, No. 3 Andi Trimulyono
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 18, No 3 (2021): October
Publisher : Department of Naval Architecture - Diponegoro University

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

Abstract

Front-matter V. 18, No. 3 Andi Trimulyono
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 18, No 3 (2021): October
Publisher : Department of Naval Architecture - Diponegoro University

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

Abstract

Modification of Surface Buoy to Preserve Under Water Habitat in Raja Ampat Ocid Mursid; Nurul Huda; Haris Nubli
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 | DOI: 10.14710/kapal.v19i1.41792

Abstract

The ecosystem of the seabed is threatened by anchoring operations. Modifications were required toreduce the damage to seabed biodiversity. A laid chain on a mooring system is one of the causes ofdamage to the seabed environment. In this paper, six mooring configurations are studied to achieve theoptimum configuration on the moored vessel KM Putri Mandiri based on the chain length laid, thetension chain, and the vessel offset. The benefit of this study is to preserve the underwater habitat in RajaAmpat. The quantities and buoyancy capacities of the surface buoy are used as variable designs in thisstudy. Ansys Aqwa software is utilized to calculate mooring systems with environmental conditions,water depth 15 m, wave height 1.5 m, wind velocity 15 knots, and sea current speed of 1 m/s. The resultsshowed that more surface buoys caused lower laid chain length and closer ship offset but increasedtension chain. Configuration E, which consists of 3 surface buoys, was the optimum configuration for thisstudy.

Page 31 of 41 | Total Record : 408

 29   30   31   32   33 

Filter by Year

2006 2026


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