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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
 18   19   20   21   22 
Linearized Morison Drag for Improvement Heave Response of Semi-Submersible by Diffraction Potential Siow, C.L.; Koto, Jaswar; Abyn, Hassan; Khairuddin, N. M.
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 6 No 1 (2014): 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.v6i1.499

Abstract

This research is targeted to improve the semi-submersible heave response prediction by using diffraction potential theory by involving drag effect in the calculation. The comparison to the experimental result was observed that heave motion tendency predicted by the diffraction potential theory is no agreed with motion experimental result when the heave motion is dominated by damping. In this research, the viscous damping and drag force for heave motion is calculated from the drag term of Morison equation. The nonlinear drag term in Morison equation is linearized by Fourier series linearization method and then inserted into the motion equation to correct the inadequate of diffraction potential theory. The proposed numerical method is also applied to simulate the semi-submersible motion response to obtain the heave motion tendency predicted by this numerical method. In comparison to the experimental result which tested at the same wave condition obtained that the diffraction potential theory with the Morison drag term correcting is able to provide satisfying heave response result especially in damping dominated region.
Application and Development of Multi-Hulls Dubrovsky, Victor A.
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 6 No 1 (2014): 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.v6i1.498

Abstract

A brief history of the expanded application of multi-hull ships and boats is shown. The possibilities of catamaran development are proposed. The first line of multi-hull development is the wider use of various types of multi-hulls. The second line of development is a special method of designing, including complex comparison of seaworthiness. The proposed method ensures the elimination of the disadvantages of multi-hulls, and the fullest realization of their advantages. Practical examples of the developments are shown.
Absorption Acid Gas Removal in Liquefied Natural Gas Process Koto, Jaswar
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 7 No 1 (2014): 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.v7i1.497

Abstract

Simulation of fluid mechanic of amine absorber process in removing acid gas from feed sour gas in LNG production plant is presented in this paper. The amine absorption in the Removing Acid Gas Process is designed to remove carbon dioxide, hydrogen sulfide and other sulfur compounds from the sour feed gas. The sour gas together with the recycle gas from the Treater unit enters the bottom of Amine Absorber and flows upward and passes through a demister pad to water wash section. In the Amine Absorber, the down-flowing amine solution absorbs and from the up-flowing sour gas to produce a sweetened gas stream as a product and an amine solution rich in the absorbed acid.
Palm Stearin as Alternative Binder for MIM: A Review Arifin, Amir; Sulong, Abu Bakar; Gunawan, Gunawan; Mohruni, Amrifan Saladin; Yani, Irsyadi
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 7 No 1 (2014): 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.v7i1.496

Abstract

Palm stearin is one of the fractionation process results from palm oil that is the largest commodities in the world. It has potentially as an alternative of binder in metal injection molding based on researches that conducted in Malaysia. Palm stearin can be combined with other binder to be a binder system with the function as lubricant and surfactant in a binder system. Based on experiments showed Palm stearin has fulfilled requirement as binder in MIM such as pseudoplastic behavior from rheological test and homogeneity of the feedstock. Palm stearin can replace conventional binders that commonly used in industry.
Review on Aerodynamic Characteristics of Helicopter Tail Rotor Propeller Using Quasi-Continuous Vortex Lattice Metho Firdaus, Firdaus; Koto, Jaswar; Ammoo, M.S; Ishak, I.S.; Nofrizal, Nofrizal
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 7 No 1 (2014): 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.v7i1.495

Abstract

This paper reviews on application of quasi continuous vortex lattice method for determining the performance of helicopter tail rotor propeller. Tail rotor blade for Bell B206 of one seat helicopter is used. The method is developed to be suitable for analyzing the performance of propeller in term of thrust, torque, and efficiency. These parameters are calculated based on pressure on blade.
Structural Sensitivity of Tarpon Monopods in Intermediate Water Depths for Marginal Field Development Eik, Lee Hsiu; Liew, Mohd Shahir
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 7 No 1 (2014): 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.v7i1.494

Abstract

The Tarpon Monopod is a minimal platform cable guyed caisson used to develop marginal fields. An in depth structural sensitivity study is performed on the Tarpon platform in 76 m water depth situated in Malaysian waters. An operating Tarpon platform offshore Peninsular Malaysia is modelled in the finite element structural analysis software, SACS v5.3 to reflect the as built condition and simulated to a combination of four different storm design criterion with two dominant approach directions to capture the monsoon seasons in the region. The guying system will be varied by simulating trivial loss of wire ropes from being intact, fully guyed to its damaged, freestanding mode. The results suggest that the Tarpon Monopod has relatively low structural redundancy and its integrity highly depends on its guying system condition. Structural weaknesses are identified alongside proposed key best practices and potential improvements to the platform.
Small Water-Plane Area Corvette: Algorithm and Example of Designing Dubrovsky, Victor
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 : 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.v8i1.493

Abstract

Corvettes and patrol ships with various roles are more or less important parts of various fleets. Usually the corvettes are high-speed (21-35 knots) ships of restricted displacement (from 600 up to 3000 t). This means some essential restrictions of operability by waves. Therefore, the development of the corvette’s seaworthiness is an important need of the future fleet. Ships with a small water-plane area, SWA ships, differ from all displacement ones by having the highest achievable seakeeping and by minimal losses of speed in waves. A concept of SWA corvette is designed by a special algorithm and proposed for the world market.
Fabrication Scheduling of Electrical House of FPSO using Dependency Structure Matrix Ahmad, Norhaziyah Afiqah Binti; Effendy, Moh Hafidz; Koto, Jaswar
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 : 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.v8i1.492

Abstract

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.
Wells Turbine for Wave Energy Conversion for Malaysian Ocean Ahmed, Yasser M.; Yaakob, O. B.; Elbatran, A. H.; Mazukee, U. J. A.
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 : 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.v8i1.491

Abstract

Malaysia is surrounded by ocean, therefore Malaysia is a perfect candidate for harvesting ocean energy as electrical generator to distribute to main grid. Malaysian electrical generation still greatly influences by non-renewable energy and the electrical cost increase as the natural resource depleting. The only solution for this problem is to use renewable energy, due to geography of Malaysian land which surround by ocean; ocean energy is the best renewable energy for Malaysia. One method of converting this energy is to use Oscillating Water Column using wells turbine as converter from pneumatic energy to mechanical energy thus convert by generator to electrical energy. However, wave characteristic of Malaysian ocean make conversion of wave energy really difficult.Some parameter that affect the performance of wells turbine need to be changed, so the new geometry turbine can work effectively in Malaysian ocean of the poor ocean characteristics such as low wave high and low frequency. According to Malaysian wave data, the average wave height is from 0.5m to 1.5m with average wave frequency of 0.1 to 0.3Hz and wave period 3.34s to 10s.
Hydrodynamic Interaction of Three Floating Structures Abdul Halim, Muhammad Farid; Koto, Jaswar
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 : 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.v8i1.490

Abstract

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.

Page 20 of 33 | Total Record : 329

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