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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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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.
Experimental Investigation into the Effects of Wave Direction on Seakeeping Performances of Ship Soetardjo, Ir. Meitha
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.v34i1.404

Abstract

In early design stage of ship form design, there are some aspects need to be considered for estimation and evaluation of seakeeping of the ship. This study describes the influence of wave directions on ship motions and the effect of speed on the characteristics of ship seakeeping. In response to this study, various tests of seakeeping in irregular waves are performed in wave basin. The seakeeping tests comprise motions and accelerations tests. Experimental results are presented in tables and graphical form and the ship performances are discussed and compared with recently published data. Results presented in this paper offer practical data and may prove useful for designers at conceptual or preliminary design stages.
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.
Experimental Investigation of Forced Convection Heat Transfer Enhancement in Dimpled Tube Apet, Vilas P.; Borse, Sachin 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.v35i1.402

Abstract

The development of high-performance thermal systems has stimulated interest in methods to improve heat transfer. Tubes with artificial roughness obtained by providing dimples on the tube surface are competitive in comparison to performance and cost of other enhanced techniques currently employed in turbulent flow. In this study forced convection heat transfer characteristics from dimpled tube has been investigated experimentally. The effect of variation in dimple diameter and dimple arrangement (inline and staggered) has been investigated for Reynolds No range 12000 to 26000 dimpled tube. Additionally the effect of variation in dimple tube and diameter on pressure drop across test section has also been investigated. This investigation was carried out to observe if the use of dimples on tube can enhance heat transfer characteristics without severe penalties associated with pressure drops for turbulent flow. The results show that heat transfer enhancement under forced convection can be achieved by using dimple tubes. The enhancement in convective heat transfer coefficient is observed as 18% and in Nusselt number as 22 % as compared with plain tube for same Reynolds number. The thermal performance factor values for the staggered dimpled array geometry were more than corresponding inline dimpled array geometry in the Reynolds number range studied .
Helmholtz Equation Applied to the Vertical Fixed Cylinder in Wave Using Boundary Element Method Ghassemi, Hassan; Gharechahi, Ataollah; Soleimani, Kaveh; Ketabdari, Mohammad Javad
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 36 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.v36i1.401

Abstract

Helmholtz equation is employed to the wide variety of engineering problems. This paper presents using Helmholtz equation to the vertical fixed cylinder against regular wave by the boundary element method (BEM). The results are included the pressure and forces on the cylinder. The present results are compared with available data, and show in good agreement. The results show that up to a certain dimensionless wave length, the wave force has a direct relation with the dimensionless wavelength, while after the force decreases with the increase of the dimensionless wave length.
Analysis of Three Phase Induction Motor Supplied by SVPWM Inverter for Electric Bike Application Hamzah, Amir; Suwitno, Suwitno; Romy, Romy; Hutabalian, Ronaldi
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 36 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.v36i1.400

Abstract

Electric drive on an electric bike, consist of electric motor, power converter and electronic controller. These are the mover of electric vehicle system. This paper discussed the three-phase inverter with Space Vector Pulse Width Modulation (SVPWM) method as a three-phase induction motor drive in electric bike application. The discussed that are modeled by using MATLAB/SIMULINK. The purpose of this paper is to get the analysis of the three-phase inverter SVPWM as a three-phase induction motor drive with specification 500 W, 50 V, 50 Hz and 8 poles. Converter using a battery with a voltage 48 V. Before the battery voltage is converted by an inverter, battery voltage was increased through a boost converter up to 70.62 V. Through simulation with MATLAB software was obtained curve of sinusoidal voltage, current, and speed of the motor by SVPWM controlled system. In this paper also tested against changes in the value of the fundamental frequency inverter. Test results show that the inverter can be set the speed of the motor at a frequency of 20 Hz to 50 Hz. Electric drive on an electric bikes, consist of electric motor, power converter and electronic controller. These are the mover of electric vehicle systems. This paper discussed the three-phase induction motor supplied by Space Vector Pulse Width Modulation (SVPWM) inverter. They discussed that are modeled by using MATLAB/SIMULINK. The purpose of this paper is to get the analysis of the three-phase inverter SVPWM as a three-phase induction motor drive with specification 500 W, 50 V, 50 Hz and 8 poles. Converter using a battery with a voltage 48 V .
Simulation of Single Phase Five-Level Inverter Based Modified Pulse-Width Modulation Approach Maharmi, Benriwati; Ermawati, Ermawati
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 37 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.v37i1.399

Abstract

The solar cells can generate electrical energy in form of Direct Current (DC). Generally, electrical appliances have used an Alternating Current (AC). Sequence, an inverter circuit is needed to convert electrical energy form DC to AC. This paper aim is to simulate an inverter performance of single-phase five-level using the method of modified Pulse Width Modulation (PWM). A scheme of the circuit model of single-phase five-level inverter was constructed to investigate their performance. The model was simulated by using of PSIM Software. The simulation parameters were set as a triangular wave frequency used 2 KHz. Then, the same phase was set as the carrier waves and a sinusoidal signal with a frequency of 50 Hz as a reference signal. The circuit scheme model used a switching frequency MOSFET gate as a power switch on the single-phase five-level inverter. The result indicated the simulation as an expectation to generate a constant of five level voltage and sinusoidal current output, which the harmonics values were small. Therefore, the inverter circuit scheme is safe to use for the AC electrical appliances.
Synthesize and Characterization of Hydroxyapatite from Freshwater Snail Shell Sulcospira Sp. Proceed by Combination of Ball Milling and Heat Treatment Fajri, Hidayatul; , Gunawarman; Affi, Jon; Putra, Rezky Syahemi
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 37 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.v37i1.398

Abstract

Hydroxyapatite is one of important material in orthopedic application because its features like human bone, and it has potential to replace metal and ceramic in implantation. Hydroxyapatite may get from waste which rich calcium like sea shell and snail shell. In this research, the characterization of raw materials of hydroxyapatite from freshwater snailshell (Sulcospira sp.) was investigated. The shell was milled with ball mill in 200 rpm during 15 minute with 4 steps. Between the milling was conducted heat treatment process at temperature 900°C for 4h. The shell powder was then sorted based on its roughness with siever machine. Powder characterization was done with Scanning Electron Microscope (SEM), Energy Dispersive X-ray (EDX) and X-ray Diffraction (XRD). Result of this study show that the minimum size of powder about 67 µm and percentage of calcium in the powder is increased until 55%.
Failure Prediction of Cracked Pressure Vessel under Fatigue Load Based on API 579 Standard and Finite Element Method Akbar, Musthafa
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 37 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.v37i1.397

Abstract

Failure prediction of cracked pressure vessel is analyzed based on crack growth behavior under fatigue loading. The major objective of this study was to investigate and validate the use of commonly used industry standard with finite element method in order to predict failure of cracked pressure vessel. Growing of crack due to fatigue load was analyzed using both analytical and finite element method. In analytical side, API 579 Code is used with involving safety and correction factor which will increase conservatism degree of the results. Pressure vessel with D/t ratio 40, 60, and 80 were taken into analysis. Semi elliptical cracks in longitudinal and circumferential position were included into analysis with ratio a/t=0.3, 0.5, 0.8 and a/c=0.15, 0.125, 0.1. In this paper, there are 84 numerical model were solved numerically and plotted into several curves. Comparisons between API 579 and finite element simulation show that pressure vessel with D/t=40, 60 and 80 have percent error about 2.16 %, 9.32 % and 10.57 %, respectively. This results are reasonable due to several safety factor are included in API 579 analysis. Results of this paper can be used as consideration for make a decision regarding to integrity analysis of pressure vessel.

Page 29 of 33 | Total Record : 329

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