Articles
<![CDATA[Fabrication Scheduling of Electrical House of FPSO using Dependency Structure Matrix ]]>
<![CDATA[Ahmad, Norhaziyah Afiqah Binti]]>;
<![CDATA[Effendy, Moh Hafidz]]>;
<![CDATA[Koto, Jaswar]]>
<![CDATA[ Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 8 No 1 (2014): Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse) ]]>
Publisher : <![CDATA[International Society of Ocean, Mechanical and Aerospace -scientists and engineers- (ISOMAse) ]]>
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DOI: 10.36842/jomase.v8i1.492
<![CDATA[Electric House is a complete power plant system that supplies the electrical distribution network to site. Installation this power plant system have used in the world wide especially in industrial, utilities, renewable energy, outdoor switchgear and moveable substation. As we can see, in offshore industries application, Electrical House can be installed in Floating Production and Storage Offloading (FPSO). Since, engineering work is procedural and repeatable, complexity process will repeat again and again. Thus, problem happens stemming when complex processes which involves interdependent (feedback and iteration) in designing and fabricating process that affect the schedule of the project. Project management tools such as CPM, PERT and Gantt widely used to scheduling application do not address complexity of the interdependency and feedback iteration. In this research discusses scheduling of FPSO E-House module Fabrication Model using Dependency Structure Matrix (DSM) method in order to address the complexity. Partitioning DSM process which minimize the amount of iteration (iteration) within the process. As a result, reducing probability of iteration will affect to the time reduction to complete the project.]]>
<![CDATA[Hydrodynamic Interaction of Three Floating Structures ]]>
<![CDATA[Abdul Halim, Muhammad Farid]]>;
<![CDATA[Koto, Jaswar]]>
<![CDATA[ Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 8 No 1 (2014): Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse) ]]>
Publisher : <![CDATA[International Society of Ocean, Mechanical and Aerospace -scientists and engineers- (ISOMAse) ]]>
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DOI: 10.36842/jomase.v8i1.490
<![CDATA[This study will highlight the motion characteristics of single body and multiple bodies of offshore structures due to the effect of hydrodynamic interaction by considering the gap distance, the presence of number of neighboring structures and the wave direction headings. In order to analyze the added mass, radiation damping and motion responses that are developed during the interaction between structures, commercial software ANSYS AQWA is used. The analysis are executed by using 100 m diameter of round-shaped FPSO as the reference point for a single body where it is compared with two bodies and three bodies by using 70 m diameter round-shaped FPSO and LNG vessel for gap distance of 25 m and 50 m and wave directions at 00, 450, 900, 1350 and 1800 headings. The results show same trend with previous studies and researches in which the motion responses due to the effect from other structures occur significantly on surge and pitch motions compare to heave mot ion though there are small interactions. As for overall, the gap distance between structures, the presence of number of neighboring structures and the wave directions affect the motions of multiple bodies of offshore structures due to hydrodynamic interaction.]]>
<![CDATA[Lumber Drying Model in Traditional Shipbuilding ]]>
<![CDATA[Patrick, Bayo-Philip]]>;
<![CDATA[Koto, Jaswar]]>;
<![CDATA[Siow, C.L]]>
<![CDATA[ Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 9 No 1 (2014): Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse) ]]>
Publisher : <![CDATA[International Society of Ocean, Mechanical and Aerospace -scientists and engineers- (ISOMAse) ]]>
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DOI: 10.36842/jomase.v9i1.489
<![CDATA[Indonesian traditional ship is a product of an indigenous technology developed long before the advent of western culture along the Coast of Sulawesi Island. The ships are built traditionally in both method and equipment without any sketches or calculations. Advancement in science and technology, and abundant information available on the World Wide Web has caused unprecedented changes in many areas of human Endeavour. However, Indonesian traditional ship builders have not taken full advantage of available technology and information particularly in the preparation of lumber which remains one of the critical and most unpredictable stages in construction. This study addressed the issue of delays which is always one of the critical issues confronting the construction of traditional ship in Kepulauan Riau. A low cost air drying model was proposed. The model was tested by comparing the air drying time of lumber in two specific conditions. Four different sample s of lumber were used to test the efficiency of both the air drying model and the natural air drying technique. In conclusion, the proposed model having applied and compared with the traditional method clearly show a better method.]]>
<![CDATA[Simulation Modeling of Rounded-Shape Floating LNG Production and Storage Capacities ]]>
<![CDATA[Sanusi, Sanusi]]>;
<![CDATA[Koto, Jaswar]]>
<![CDATA[ Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 10 No 1 (2014): Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse) ]]>
Publisher : <![CDATA[International Society of Ocean, Mechanical and Aerospace -scientists and engineers- (ISOMAse) ]]>
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DOI: 10.36842/jomase.v10i1.481
<![CDATA[Liquefied Natural Gas production processes involve many high profile control systems and equipments that costing a vast amount of investment. Any mistakes in the management decision to select the resources and equipments will cause serious problem aftermath and it will be difficult to meet the expected output. Production processes play very important rules in Liquefied Natural Gas Supply Chain and integration with well models (under water process), storage models, transportation model and receiving terminal models. The main focuses of this paper are to simulate production and storage capacities of Rounded-Shape Floating Liquefied Natural Gas by considering the capacity of every single process and utilization of equipments used and storage design. Simulation modeling can be used as controlling and decision making tool with associated factors such as Front-End Engineering Design rate, capacity of every process and storage design capacity.]]>
<![CDATA[Motion of Ship-Shaped Floating Liquefied Natural Gas ]]>
<![CDATA[Koto, Jaswar]]>
<![CDATA[ Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 11 No 1 (2014): Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse) ]]>
Publisher : <![CDATA[International Society of Ocean, Mechanical and Aerospace -scientists and engineers- (ISOMAse) ]]>
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DOI: 10.36842/jomase.v11i1.480
<![CDATA[Floating Liquefied Natural Gas (LNG) recently are new in the offshore platform and operation, since it is new so it is important to analyzed the stability and seakeeping of this vessel. This project are conducting stability assessment and seakeeping of Floating Liquefied Natural Gas (LNG) with initially it has to design the hull by referring the basic dimension of FPSO KIKEH that located at the 120 km northwest of Labuan Island which is the environmental location of this project. Hence this project are using Maxsurf for designing the hull, Hydromax to do stability assessment and Seakeeper for seakeeping analysis which is to generate wave spectrum and Response Amplitude Operator and hence to analyzed the motion characteristic of this vessel behavior in the research location.]]>
<![CDATA[CO2 Emission of Marine Transports in Batam - Singapore ]]>
<![CDATA[Rashidi, M.]]>;
<![CDATA[Koto, Jaswar]]>
<![CDATA[ Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 11 No 1 (2014): Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse) ]]>
Publisher : <![CDATA[International Society of Ocean, Mechanical and Aerospace -scientists and engineers- (ISOMAse) ]]>
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DOI: 10.36842/jomase.v11i1.478
<![CDATA[Global warming and air pollution have become one of the important issues to the entire world community. Exhaust emissions from ships has been contributing to the health problems and environmental damage. This study focuses on the Strait of Malacca area because it is one of the world’s most congested straits used for international shipping where located on the border among three countries of Indonesia, Malaysia and Singapore. This study will predict CO2 emission from the marine transport. This is accomplished by developed a ship database in the Straits of Malacca by using the data which obtained from Automatic Identification System (AIS). From the database, MEET methodology is used to estimate the CO2 emission from ships.]]>
<![CDATA[Pressure Distribution at Water Entry of a Symmetrical Wedge ]]>
<![CDATA[Nikfarjam, M.]]>;
<![CDATA[Koto, Jaswar]]>;
<![CDATA[Yaakob, O. B.]]>;
<![CDATA[Seif, M. S.]]>;
<![CDATA[Aref, A.]]>
<![CDATA[ Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 12 No 1 (2014): Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse) ]]>
Publisher : <![CDATA[International Society of Ocean, Mechanical and Aerospace -scientists and engineers- (ISOMAse) ]]>
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DOI: 10.36842/jomase.v12i1.475
<![CDATA[In current study, numerical and experimental investigations about water entry problem were conducted for a symmetrical wedge. The water entry problem for different geometries is one of the classical methods for determination of pressure distribution and loads around the hull of marine vehicles. These data can be used for optimum structural design of vessels particularly for high-speed crafts, which are very sensitive about the weight. In addition, the quantity of load can be considered in the equation of motion for analyzing the seakeeping performance of such vessels. In this research, the numerical analysis of free falling wedge with 30° deadrise with constant weight was done and for validation of results, it was followed by experimental tests. The outputs of this study consist of some graphs for comparison of trends for pressures respect to impact time, which can be used for signification of loads on hulls during the water entry phase.]]>
<![CDATA[Study on Model Scale Rounded-Shape FPSO’s Mooring Lines ]]>
<![CDATA[Siow, C.L.]]>;
<![CDATA[Koto, Jaswar]]>;
<![CDATA[Khairuddin, N.M.]]>
<![CDATA[ Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 12 No 1 (2014): Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse) ]]>
Publisher : <![CDATA[International Society of Ocean, Mechanical and Aerospace -scientists and engineers- (ISOMAse) ]]>
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DOI: 10.36842/jomase.v12i1.473
<![CDATA[This paper is proposed to discuss the model scale mooring line selection process and preparation for hydrodynamic model experiment. The model scale mooring line should be proper select for model experiment and the error should be minimized because the error in model scale mooring line will be enlarged by the scale factor and influence the design in full scale model. In this study, tensile test experiment for model scale wire ropes was conducted to collect the material properties data of the wire ropes. The data collected from the tensile test is applied to obtain the stiffness of mooring lines in the model scale. To achieve the target to select the model scale mooring lines, the minimum breaking load of the wire ropes and the elongation curve of the wire ropes are collected from tensile test for each wire rope sample. By applying catenary theory and the data from tensile test, the stiffness curve of the mooring line in model scale was estimated. The Difference between the stiffness curve between model scale and full scale is within acceptable at the required experiment range.]]>
<![CDATA[Review on Delivery Issues in Malaysian Traditional Ship Production Process ]]>
<![CDATA[Jamil Haron, Surhan]]>;
<![CDATA[Koto, Jaswar]]>;
<![CDATA[Nofrizal, Nofrizal]]>;
<![CDATA[Dalil, M.]]>
<![CDATA[ Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 13 No 1 (2014): Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse) ]]>
Publisher : <![CDATA[International Society of Ocean, Mechanical and Aerospace -scientists and engineers- (ISOMAse) ]]>
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DOI: 10.36842/jomase.v13i1.472
<![CDATA[A study regarding the factor contribute toward the delivery issues of traditional ship production process in Malaysia was conducted with aims to identify the factor contributing to the issues and also offer some suggestion and recommendation to overcome the issues. This study was conducted based on literature material available from many resources such as the Malaysia timber council, journal publication, reports, magazines and other. The factors derived that can contribute to delivery of traditional ship building product are the issues of availability of the raw material, law that exist to protect the material and its trade, the production process, the issues of the worker’s skill and availability, the diminishing number of master shipbuilder and the payment methods. Some suggestion in overcoming the issues also been proposed like special permit to traditional shipbuilder for easier material obtain and the need of documentation of the traditional ship production process itself so that the actual problem existed can be further examine and solve.]]>
<![CDATA[Study on Strut Effect on Turning Characteristics of LNG Carrier ]]>
<![CDATA[Bin Mohd Alwi, Mohd Amirul Hamdi]]>;
<![CDATA[Koto, Jaswar]]>;
<![CDATA[Zulkarnain, Zulkarnain]]>
<![CDATA[ Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 13 No 1 (2014): Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse) ]]>
Publisher : <![CDATA[International Society of Ocean, Mechanical and Aerospace -scientists and engineers- (ISOMAse) ]]>
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DOI: 10.36842/jomase.v13i1.470
<![CDATA[There are many types of propulsion system used to propel the ship. One of them is podded propulsion system. Up to date, there is still no LNG carrier that was installed with this kind of propulsion system. The idea of installing podded propulsion system onto LNG carrier is till at design and development stage. This paper presents about the study on effect of changing the size of strut of podded propulsor to the turning characteristic of an LNG carrier named Tenaga Satu. The manoeuvring performance of this ship can be predicted by using numerical simulation method. This study is mainly focussing on modifying and developing mathematical model to simulate the turning characteristic of this LNG carrier. Three designs of pod propulsor with different strut length have been made to evaluate the effect to the turning characteristic.]]>
