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Anita Susilawati
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Teknik Mesin, Fakultas Teknik, Universitas Riau Kampus Bina Widya, Jl. HR. Soebrantas Km. 12,5 Panam, Pekanbaru 28293, Riau, INDONESIA
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Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse)
Published by Universitas Riau
ISSN : 23547065     EISSN : 25276085     DOI : http://dx.doi.org/10.36842/jomase
Core Subject : Science, Engineering,
Aerospace Engineering Decision Sciences, Operations Research & Management Engineering Industrial & Manufacturing Engineering Mechanical Engineering
The mission of the JOMAse is to foster free and extremely rapid scientific communication across the world wide community. The JOMAse is an original and peer review article that advance the understanding of both science and engineering and its application to the solution of challenges and complex problems in naval architecture, offshore and subsea, machines and control system, aeronautics, satellite and aerospace. The JOMAse is particularly concerned with the demonstration of applied science and innovative engineering solutions to solve specific industrial problems. Articles preferably should focus on the following aspects: new methods or theory or philosophy innovative practices, critical survey or analysis of a subject or topic, new or latest research findings and critical review or evaluation of new discoveries. Scope The JOMAse welcomes manuscript submissions from academicians, scholars, and practitioners for possible publication from all over the world that meets the general criteria of significance and educational excellence. The scope of the journal is as follows: Naval Architecture and Offshore Engineering Computational fluid dynamic and Experimental Mechanics Hydrodynamic and Aerodynamics Noise and Vibration Aeronautics and Satellite Engineering Materials and Corrosion Fluids Mechanics Engineering Stress and Structural Modeling Manufacturing and Industrial Engineering Robotics and Control Heat Transfer and Thermal Power Plant Engineering Risk and Reliability Case studies and Critical reviews
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 329 Documents
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Prediction of Motion Responses of Ship Shape Floating Structure using Diffraction Potential Siow, C.L.; Koto, J.; Pauzi, M.; Yasukawa, H.; Matsuda, A.; Terada, D.
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 20 No 1 (2015): Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse)
Publisher : International Society of Ocean, Mechanical and Aerospace -scientists and engineers- (ISOMAse)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36842/jomase.v20i1.446

Abstract

This paper reviewed the capability of the proposed programming coded based on diffraction potential theory to predict a ship shape floating structure’s motion response. This paper briefly presents the procedure to apply the diffraction potential theory to simulate the ship shape floating structure’s motion response. As case study, the proposed programming code was applied to prediction motion responses of ship shape floating structure in surging, heaving, pitching, swaying, rolling and yawing directions. Results of simulation were compared with ANSYS AQWA software as bench mark. It found that the simulation results by the proposed programming code are similar with the ANSYS one.
Projection of Ocean Wave Climate Change Based on Numerical Simulations Zikra, Muhammad; Hashimoto, Noriaki; Mitsuyasu, Kodama
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 21 No 1 (2015): Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse)
Publisher : International Society of Ocean, Mechanical and Aerospace -scientists and engineers- (ISOMAse)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36842/jomase.v21i1.445

Abstract

This study aims to analyze global wave climates of present and future time by using the WAM model. The analysis is performed based on wind climate data from the JMA/MRI-AGCM3.2 climate change projection. We analyze two 6-hourly wind data sets, covering two periods: the present climate ranging from 1979-2003 and future climate extending from 2075-2099. These wind data are used to implement the WAM model for producing the outputs of wave characteristics. Subsequently, the outputs from each period were used to study global wave climate in the future. The analysis showed that the wave climate is strongly dependent on the geographical position of regions from mid to high latitude and low latitude. This includes regions where the climate induced changes for present to future climate. The largest increases of significant wave height which reached approximately 5% occur in the southern parts of the Indian, Pacific and Atlantic Oceans and in the Antarctic Ocean. The decreases in the same magnitude around 5% occur especially in the North Atlantic Ocean.
Production Process of Traditional Ship in Bintan-Indonesia Putra, Risandi Dwirama; Koto, J.
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 21 No 1 (2015): Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse)
Publisher : International Society of Ocean, Mechanical and Aerospace -scientists and engineers- (ISOMAse)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36842/jomase.v21i1.444

Abstract

Indonesia is the world's largest archipelagic country in the world, demand for marine transportation is very important. Marine transport being very strategic because it plays a role in connecting one island to another island and marine transport is a tool for economic activity. Global industrialisation causes traditional shipyard less competitive, causing reduction in the number of traditional ships, which are urgently needed to support economic activity. Proper production management planning at the shipyard is expected to help improve the quality of traditional shipbuilding for competitive. This paper discusses current issues of traditional shipyards in Kepulauan Riau-Indonesia and implementation of IDEF models as tool for solving the problem by taking the following factors into account: concept design, perform preliminary design, contract design, detail design and building of ships.
Numerical Study on the Effect of Horizontally Installed Corrugated Plate Boundary Condition under Blast Load Riyanto, Raditya D.; , Handayanu; Prastianto, Rudi W.
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 21 No 1 (2015): Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse)
Publisher : International Society of Ocean, Mechanical and Aerospace -scientists and engineers- (ISOMAse)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36842/jomase.v21i1.443

Abstract

Blast hazard load on offshore and marine operation resulting very catastrophic failure. Installation of protection devices needs to be applied. There are active and passive protection available. This paper investigates the use of corrugated plate as a passive protection to resist blast loads based on ASCE (American Society of Civil Engineers) - Design of Blast Resistant Building in Petrochemical Facilities. This paper aims to investigate the response in terms of stress, deformation and energy dissipation of corrugated plate with accounting the effect of boundary condition.The horizontally installed corrugated plate is modeled using well known FEA Software, ANSYS. Numerical simulation is validated using meshing sensitivity study. The plate is then loaded by light, medium, and heavy explosions, represented by uniform pressure. Numerical simulation of non-linear structural analysis is performed. Based on the analysis result, it is concluded that the pinned and fixed boundary condition corrugated plate successfully resists the all the blast load variations, but the pinned support gives average better responses.
A New Engine Simulation Structure Model Applied to SI Engine Controlling Nekooei, Mohammad Javad; Koto, J.; Ghani, M.Pauzi; Dehghani, Zahra
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 22 No 1 (2015): Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse)
Publisher : International Society of Ocean, Mechanical and Aerospace -scientists and engineers- (ISOMAse)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36842/jomase.v22i1.442

Abstract

High ratio emissions that outcome from incomplete combustion cause air contamination, poorer the performance of the spark ignition (SI) engine and raise fuel consumption. Because of engine configurations, engine wrong adjustment and engine subsystems, unfortunately completed combustion is not possible with SI engines .As a result of uncompleted combustion a high ratio of CO, HC, NOX and PM harmful emissions such as come into atmosphere. Study has exposed that exact AFR control can successfully decrease emission of dangerous exhaust, such as CO, NOX and unburned HC. To achieved this goal we need to make a correct engine simulation structure which it can be used to controlling AFR. Firstly, the existing engine simulation models and structures will be studied in this paper, where benefits and disadvantages of several simulation models and structures kinds are discussed. After that we will present our new engine simulation structure model.
Calculations of the Heave and Pitch RAO’s for Three Different Ship’s Hull Forms Ghassemi, Hassan; Majdfar, Sohrab; Gill, Valiollah
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 22 No 1 (2015): Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse)
Publisher : International Society of Ocean, Mechanical and Aerospace -scientists and engineers- (ISOMAse)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36842/jomase.v22i1.441

Abstract

The research carried out in this article is to determine the RAO (Response Amplitude Operator) heave and pitch motions of three different ship’s hulls forms. Ship is running at the head sea of the regular wave and its responses are obtained by modified strip theory using Maxsurf software. Three different ship’s hull forms (Wigley-S60-DDG) are selected in order to predict the results. The obtained results of RAO heave and pitch motions are presented and discussed at various Froude numbers.
Mechanical Properties and Microstructure of Artificial Bone Prototype Made of Bovine Bone Powder by Mixing Method Paskarino, Rio; Affi, Jon; , Gunawarman
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 23 No 1 (2015): Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse)
Publisher : International Society of Ocean, Mechanical and Aerospace -scientists and engineers- (ISOMAse)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36842/jomase.v23i1.440

Abstract

The purpose of this study is to obtain bovine bone powder with high content calcium-phosphorus coumpound through combination of ball milling and heating processes. These processes was carried out in four stages at a temperature of 800°C for heating process. The obtained powder was then mixed with zirconia and resin, and then molded into a metal mold to obtain artificial bone prototypes in the form of dog-bone tensile test specimen. The tensile test was then conducted to the specimens to obtain the strength and strain capacity of the artificial bones. Fractured specimen surface morphology and sample microstructure were then examined using a scanning electron microscope (SEM) equipped with Energy Dispersive X-ray (EDX). The result of this study shows that the highest levels of calcium and phosphorus contents is 35.07% and 19.04%, respectively, with powder fineness of 63 ?m. The strength of artificial bone varies according to the powder volume fraction, where the fraction of 90% powder and 10% resin gives the strength 5,57MPa. While the fractions of 80-20, 70-30 and 60-40 give the strength of 11.84 MPa, 13.66 MPa, and 9,56 MPa, respectively. The microstructure of the specimens shows micro cracks, voids, detachement particles, and agglomeration with different extent depend on the fraction of the powders.
Liquefied Natural Gas (LNG) Safe Loading and Unloading Model in Port Operation Kader, Ab Saman Abd; Oladokun, Sulaiman; Shamsuri, W.N.W.
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 23 No 1 (2015): Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse)
Publisher : International Society of Ocean, Mechanical and Aerospace -scientists and engineers- (ISOMAse)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36842/jomase.v23i1.439

Abstract

This project presents the study of the safe procedures of LNG loading and unloading operation in port. The purpose of this study is to maintain the safety record of LNG operation for this roughly forty years. The study is carried out by performing ‘one to one interview’ with the port’s safety officer. Then, the collected data from the personal interview is analyzed using Hazard Identification (HAZID) approach. The detail procedures, technical data, and explanation from port’s safety as an expertise in LNG handling field could be needed to determine the potential improvement that could trigger the idea to develop a generic safety model which is refined and improved of the existent holistic model that being reviewed in this study. The model developed in this study is to be applied onto either loading or unloading LNG terminal all over the world. This model is expected to meet the aim of minimizing the unsafe act and near miss which is always be the initiation point of harmful incident and accident. Model which has been developed is an improved and refined version of a generic safety model. The model developed describes the integration of technologies within the system of working competency which also reconsidering the individual performance. In the same time, it aimed to reduce the probabilities of the crews or operators to engage with unsafe act which always introduce the consequence of near miss, which is to be minimized in this research. The model developed in this study is called ‘H-T-D’ safety model, which stand for human factor, technical handling, and design element.
Prediction of Non-Cavitating Marine Propeller Noise Satyavarma, K.L.; Devi, C. Neelima
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 23 No 1 (2015): Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse)
Publisher : International Society of Ocean, Mechanical and Aerospace -scientists and engineers- (ISOMAse)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36842/jomase.v23i1.438

Abstract

Noise reduction and control is an important problem in the performance of underwater acoustic systems. As the propeller rotates, it is subjected to unsteady force, which leads to discrete tonal noise, and cavitation. Therefore, underwater propeller noise can be classified into cavitating and non-cavitating noise Furthermore, sound generated by a propeller is critical in underwater detection and it is often related to the survivability of the vessel. This paper presents a numerical study on noises of the underwater propeller for different performance conditions. The non-Cavitating noise generated by an underwater propeller is analyzed numerically in this study. The flow field is analyzed with finite volume method (FVM), and then the acoustic analysis is made by the use of Ffowcs Williams–Hawkings (FW-H) formulation to predict the far-field acoustics at different operating conditions. Noise characteristics are presented according to different positions of hydrophones and speeds of the propeller. Computed results are shown to be in good agreement with experimental results.
Wave Climate Variations in Indonesia Based on ERA-Interim Reanalysis Data from 1980 to 2014. Zikra, Muhammad; Ashfar, Putika
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 24 No 1 (2015): Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse)
Publisher : International Society of Ocean, Mechanical and Aerospace -scientists and engineers- (ISOMAse)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36842/jomase.v24i1.437

Abstract

In this study, temporal variation in significant wave height are studied using ERA-Interim reanalysis data from ECMWF (European Centre for Medium-Range Weather Forecasts) for 35 years period from 1980-2014. The ERA-Interim reanalysis data provides wind speed and wave height data with resolution of 1 x 1 degree. This paper studied monthly variation in significant wave height and wind speed by creating monthly data and taking the mean of those months over a period 35 years. The results show that the mean wind speed and significant wave height in the South of Java Sea have an increasing trend for all month.

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