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Koto, J.
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Aerospace Engineering Decision Sciences, Operations Research & Management Engineering Industrial & Manufacturing Engineering Mechanical Engineering

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Theoretical Review on Prediction of Motion Response using Diffraction Potential and Morison Siow, C.L.; Koto, J.; Yasukawa, H.; Matsuda, A.; Terada, D.; Guedes Soares, C.
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 18 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.v18i1.452

Abstract

This paper reviewed the capability of the proposed diffraction potential theory with Morison Drag term to predict the Round Shape FPSO heave motion response. From both the self-developed programming code and ANSYS AQWA software, it can be observed that the diffraction potential theory is over predicting the Round Shape FPSO heave motion response when the motion is dominated by damping. In this study, Morison equation drag correction method is applied to adjust the motion response predicted by diffraction potential theory. This paper briefly present the procedure to integrate the Morison equation drag term correction method with the diffraction potential theory and then, the proposed numerical method was applied to simulate the Round Shape FPSO heave motion response. From the comparison, it can be concluded that Morison equation drag correction method is able to estimate the FPSO heave response in the damping dominated region and provides more reasonable motion tendency compare to the diffraction potential theory without consider the drag effect in the calculation.
Experimental Study on Effect of Mooring on Motion Response of Rounded-Shape FPSO Model Siow, C. L.; Koto, J.; Yasukawa, H.; Matsuda, A.; Terada, D.; Guedes Soares, C.; Incecik, A.; Pauzi, M.; Maimun, A.
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 19 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.v19i1.448

Abstract

This paper discusses the motions response of moored rounded-shape FPSO model due to the wave effect. The research analyzed the possibility of wave motion response of rounded-shape FPSO model affected by different mooring systems. Experiment of a scale FPSO model of 1:112 was conducted in basin tank at the National Research Institute of Fisheries Engineering, Japan. In the experiment, the FPSO model was firstly tested by attaching model scale of Catenary mooring lines to rounded-shape FPSO model. Then the experiment was repeated by attaching model scale of Taut mooring lines to the rounded-shape FPSO model. Comparing results obtained using Taut and Catenary mooring lines in regular wave were presented. This research concluded that the mooring systems would not give significant effect to wave frequency motion response of the rounded-shape FPSO.
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.
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.
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.
Modelling Recurrence Motion on a Large Volume Semi-Submersible Putra, Risandi Dwirama; Koto, J.
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 31 No 1 (2016): 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.v31i1.412

Abstract

This research described a study of recurrence motion on a volume submersible. Recurrence is the phenomenon in which a system of quasi-periodically returns to its initial conditions after undergoing some degree of evolution, this finding supports the theory of quasi determinism (QD) of sea waves. The research to determine recurrence characteristic of motion in the large volume of semisubmersible using computational methods of ANSYS® AQWA™. The motion was analyzed four types of different incident waves by using JONSWAP Spectrum and are generally regarded as a pure randomness in nature which interacts with the structure generating hydrodynamic motion. Responses of motion were performed for 3 hours, in which it was divided into 9 seed for each incident wave. Hs 7 meters Tp 12.7 sec, Hs and 7 meters Tp 13.5 sec, Hs 8 meters and Tp 12.7 sec, and Hs 8 meters and Tp 12.7 sec , recurrence occurred in the interval (to +635s, to +879) - (to+1774, +to2074), (to +1460, to+1635) - (to +5758, to +5933), (to +693, to+882) - ( to+1735, to+1924) and (to +792, to+992) - (to+1938, to+2138), respectively. Recurrence motion on a large volume semisubmersible support the to support the quasi determinism (QD) theory.
Review on Design of Oil Subsea Pipeline in Kikeh Field, Malaysia Junaidi, M.N.; Koto, J.
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 32 No 1 (2016): 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.v32i1.408

Abstract

The encourage and positive development of oil and gas project in Malaysia deep water sea has led to the exchange of the underwater exploration from the shallow water depth to deeper water depth. However, this changes have raises the issue on deep water challenges for the submarine pipeline design. Designing a subsea pipeline is a challenge task and the process requires a detailed study and assessment of relevant pipeline design consideration and pipeline failure criteria. “Design of Deep Water Oil Subsea Pipeline in Malaysian Seas” project discuss a number of issues that need to be taken into account when designing a deep water subsea pipeline for Malaysian waters, mainly related to the excessive external pressure on the pipeline. Problems of high external pressure will results in pipeline failure such as system collapse and propagation buckling of a pipeline. In addressing these issues, consideration towards pipeline wall thickness design is being taken and the design process of the pipeline will be made in accordance to DNV class rule. Apart from that, a case study related to existed oil and gas project in Malaysia has being carried out, where Kikeh Gas Pipeline project from Kikeh oil field was selected as a study subject. By referring to the case study, a decent subsea pipeline design will be carried out and analyze so that it can suite to operate for Malaysian deep water seas.
Review on Deep Water Flowlines of Gumusut-Kakap, Malaysia Koto, J.
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 33 No 1 (2016): 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.v33i1.406

Abstract

The Gumusut-Kakap field is located at offshore Sabah Blocks J and K at 1200 m of deep water. This paper discussed on production, gas injection and water injection flowlines of Gemusut-Kakap field development using Subsea Pro Simulation. The study was to determine wall thickness and stress and also to determine the deformation due to buckling of pipeline.
Review on Development of Ice-Ship Afrizal, Efi; Koto, J.
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 34 No 1 (2016): 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.v34i1.405

Abstract

In the early stage, sailing by ships at North and Artic Seas should be able to break ice which is commonly called as ice-breakers. Dimensions of the ice breakers were not big enough to be used as a cargo or large carrier. As the demand to merchant ships has been increased, the development technologies on hull form design and propulsion system for ice-going ship have been improved gradually. This paper discussed historical ice ships, the development of ships in ice such as ice breaker, double acting ship and offshore floating by taken two parameters into account which is hull form design and propulsion system.
Review on Polyester Mooring Lines of Offshore Structures Amran, Nur Aireen bt.; Koto, J.; Siow, C. L.
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 35 No 1 (2016): 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.v35i1.403

Abstract

Mooring line have several types of material which is chain, wire and synthetic fiber rope. Mostly, in oil and gas industry is use chain and wire rope as a mooring line for shallow water platform. When exploitation of oil and gas become deep, synthetic fiber is use as an alternative for mooring line. This paper focused on types of material and experimental by previous researcher for deep water mooring line. Beside that, the tensile test have been done for preliminary design stage. The test is to identify the material properties of mooring line. At this stage only focus on the steel wire rope with length 200mm and nominal diameter 2mm, 2.5mm, 6mm and 8mm. Finally, the conclusion and important summaries were presented according to the data collected.
Co-Authors A, Wahid M. Afrizal, Efi Amran, Nur Aireen bt. Dehghani, Zahra Ghani, M.Pauzi Guedes Soares, C. Incecik, A. Junaidi, M.N. Maimun, A. Malek, Muhamad Asyraf bin Abdul Matsuda, A. Nekooei, Mohammad Javad Pauzi, M. Risandi Dwirama Putra Siow, C. L. Siow, C.L. Terada, D. Yasukawa, H.