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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 Double Acting Tanker Ship in Ice Mode Afrizal, Efi; Koto, J.; A, Wahid M.; Siow, C. L.
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 38 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.v38i1.396

Abstract

Podded propulsion system has been utilized to make revolutionary in the integrated ship propulsion and steering system due to diesel-electric and combining pod and rudder in the compact body. This paper would review utilization of podded propulsion system on the Double Acting Tanker (DAT) ship in ice mode. The DAT ship can be operated running ahead mode and astern mode in open water and ice conditions.
2 MW Closed Cycle SWOTEC in Mentawai, Sumatera Barat, Indonesia Koto, Jaswar
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 38 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.v38i1.395

Abstract

Solar, Wind and Ocean Thermal Energy Conversion (SWOTEC) is a clean marine renewable energy using temperature difference between the sea surface and the deep ocean to rotate a generator to produce electrical energy. Indonesia is an equatorial country located at latitudes less than 20 degrees covered by 77 % ocean, thousand islands, strain and many difference of topography, SWOTEC is very compatible build in Indonesian. This paper discussed on performance of 2MW closed cycle of SWOTEC in Siberut Island, Sumatera Barat-Indonesia. Siberut Island has a hot and humid tropical rainforest climate, with an annual rainfall of 4,000 mm with temperatures range 22 - 31 0C and humidity averages 81-85%. The study founded that the Siberut island has potential SWOTEC due to the gradient temperature more than 20 0C. The electricity and fresh water generated by the SWOTEC are more promising to be applied in the island.
Prediction of Flow Distribution in Cooled Gas Turbine Blade with Ribs, Pin-Fins and Film Cooling Holes in Leading Edge Passage Borse, Sachin L.
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 38 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.v38i1.394

Abstract

Modern gas turbine blade is internally cooled to maintain its temperature at safe level. Prediction of mass flow distribution in cooling passage of the turbine blade helps in predicting turbine blade temperature during the design stage. In this current paper, commercial software FLUENT 6.2 is used to predict mass flow distribution in the gas turbine blade cooling passages (like leading edge passage, serpentine passage, trailing edge passage, lateral ejection, tip and film cooling holes) with standard k-e and RNG k-e turbulence models. Model suitable to solve such problem requires huge computational resources. Although present model are not suitable for the problem considered but will help to get approximate results and will also indicate capability of CFD. Results are compared with experimental results. Result showed good agreement of predicted mass flow distribution with experimental results. RNG k-e model shows slight improvement in prediction of the supply pressure over other two models.
Comparison of Commercial and Palm Slag Motorcycle Brake Pads Performance Badri, Muftil; Arief, Dodi Sofyan; Prayitno, Adhy
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 38 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.v38i1.393

Abstract

This paper presents a number of experimental data and techniques used in performance of commercial and palm slag motorcycle brake pads. The experiments include wear and hardness tests. The wear behavior of motorcycle brake pad that was observed in the study on sliding contact member brake discs results in the conversion of kinetic energy into heat at the pad and disc interface leads to this investigation. The effects of speed of disc brake rotor are presented. Experimental results of the respective tests are presented on two motorcycle brake pads, namely commercial brake pad (CBP) and palm slag brake pad (PBP). It was found that the wear behavior of palm slag brake pad is influenced by design of geometry shape of motorcycle brake pad. The wear behavior of CBP and PBP composite depend on wet and dry condition. It is clearly seen that wear behavior of PBP composite increase significantly with dry condition. Wear behavior increase significantly with the increase of rotor speed. With increasing speed of rotor disc, the hardness of PBP composite changes from low hardness to a more stable hardness behavior.
Study on Resistance of Stepped Hull Fitted With Interceptor Plate Malek, Muhamad Asyraf bin Abdul; Koto, J.
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 39 No 1 (2017): 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.v39i1.392

Abstract

The application of appendages or trim control mechanisms such as the interceptor plate, stern flap and trim tabs have been widely used in recent years most notably on high speed planning hulls including stepped hulls. With the popular use of stepped hulls in the current market, it is of upmost importance to investigate and predict the resistance of these hulls in order elongate and diversify the lifespan and function of the planning hull. It is also important in a sense to increase the effectiveness of the hulls during operation at various speeds. Eventhough the use of interceptor plates has been catching up in recent years, there had been only a handful of studies investigating the impact of interceptors on the performance of planning hulls. In the present study, a scaled down design of a bare hull used by the Royal Malaysian Customs is used. The bare hull design will be analysed in the CFD software COMSOL Multiphysics with various speeds ranging from 0 to 35.9 m/s. The results that are going to be analysed and discussed later are the total resistance and the pressure contours around the hull. Next, a stepped hull design is analysed using step height of 50 mm to 80 mm. Finally, the optimum step height will be used to be fitted with various interceptor plate height of 18 mm, 22 mm, 26 mm and 30 mm. The effect of appendage, which is the interceptor on the performance of the hull will be analysed and compared to other hull configurations. Based on literature reviews and past studies, it is found that the interceptor plates are able to reduce the total resistance by 15% to 19%. However certain parameters were not taken into account for this study, including the trim angle which is assumed to be zero for all cases. This may cause a slight error in the results, but is deemed allowable for academic purposes.
State of the Art Review of the Application of Computational Fluid Dynamics for High Speed Craft Ahmad, H. A.; Ayob, A. F.
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 39 No 1 (2017): 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.v39i1.391

Abstract

Computational Fluid Dynamics (CFD) field of research continues to advance with several new accomplishments, especially in the field of high speed craft design. This paper presents the application of advanced CFD simulations reported in the literatures in terms of software tools available, hull form optimization, resistance, and seakeeping analysis and propulsion system. It aims to review case studies of several methods utilized to conduct operational simulations that result in useful performance prediction of high speed craft. The simulations reviewed in this paper are referring to the research reported in the literatures over the last decade on patrol boats, catamarans, rescue boats and so on. Some notable analysis were discussed, e.g. resistance and seakeeping analysis, propulsion system, hull form optimization and multi physics We conclude that based on the vast resources available in the literature, CFD is one the best tool for designing high speed craft, however such work could be impacted more by its combination with optimization methods.
Design Shape and Dimension of Threshing Station Model Palm Oil Mill in PT. Perkebunan Nusantara V - PKS Sei Galuh Using Autodesk AutoCAD 2014 Software Sofyan Arief, Dodi; Sihombing, Galuh Leonardo; Hamzah, Amir; , Andri
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 39 No 1 (2017): 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.v39i1.390

Abstract

Palm oil mills in PT. Perkebunan Nusantara V PKS - Sei Galuh is a producer of crude palm oil CPO (Crude Palm Oil), which consists of several stations the processing of palm oil, one of which is the threshing station. Threshing station is the station there is a separation palm kernel process with the cluster in a way slammed into a rotating drum. The purpose of this research is to design the shape and dimension of the station threshing model palm oil mill in PT. Perkebunan Nusantara V - PKS Sei Galuh with scale of 1: 8 using Autodesk Autocad 2014 Software. Design of shapes and dimension threshing station model is divided into three groups, namely the design shape and dimension of auto feeder, design shape and dimension of thresher and design shape and dimension of screw conveyor. The design shape and dimension of auto feeder are 2 units sprocket and 11 plate shaped profile L. The design shape and dimension of thresher is a diameter of 230 mm and a length 500 mm. The design shapes and dimension of screw conveyor are 3 screw with a diameter of 100 mm and a length of each screw is 156 mm, 160 mm and 156 mm. Cover on the design of the shape and dimension of screw conveyor U-shaped profile with a diameter of 120 mm and a length of 620 mm cover.
Inspection Measurement Test Model Design Patrol Boats , Nandiko.Rizal
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 41 No 1 (2017): 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.v41i1.386

Abstract

Measurement is a process or an activity to determine a numerical quantity of an object with the purpose to find the best numerical value of its certain characteristics. The main points of measurement activities are: the purpose of the measurement, object of the measurement, the tools used and the process of how to do the measurement. The result of the measurement is only the estimation of the real values. Measurement, in general, means an activity using a certain chosen principle which could be qualified in some different ways. The procedure of measurement uses a selected method and usually written on a document called “the procedure of measurement” or “the method of measurement” which is written in detail to help the operator works without any further information. This paper will discuss about checking, measuring, and determining the deviation existed on the design process of making the ship patrol model,starting from the preparation until the test it self. The investigated model is characteristically spesific for test and hopefully could be used as the standard of the best optimum model to get as accurate design result as the real ship.
Application of Hybrid Fuzzy Logic Controller for Controlling AFR Engine Nekooei, Mohammad Javad; Koto, Jaswar
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 41 No 1 (2017): 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.v41i1.385

Abstract

The Kyoto Protocol (1997) has been a turning point for future economic and environmental policies for both industrialized and developing countries. The vehicle engine manufacturers are continuously working towards reducing fuel consumption and emissions while maintaining optimum performance by keeping the Air to fuel ratio (AFR) as close to the stoichiometric value of 14.7. In the present paper, new simulation model using Matlab Simulink for a SI (Spark-Ignition) engine has been developed that included all engine dynamic models such as dynamic model of the throttle body, a lambda dynamic model, a model of the intake manifold dynamic, and models of engine torque and fuel injection dynamic. Then, to control the AFR in SI engines, new controllers were proposed to maximize fuel economy and minimize exhaust emissions. A hybrid fuzzy logic controller (HFLC) was created by combining a PID control and fuzzy control. However, this model was validated using the results from engine for various constant load operation tests such as 40 Nm, 50 Nm and 60 Nm but this paper only presented operation at 60 Nm. The simulation results founded that the maximum and minimum AFR for convectional look-up and HFLC methods were (16.80, 12.4) and (15.02, 14.4) respectively. Simulation results from HFLC were lower than other methods such as Sliding Mode Control (SMC), Neural Network (NN), Proportional–Integral controller (PI) and Model-based Predictive Control (MPC) extracted from publishing data.
SEM Observation on Fracture Surface of Coconut Fibers Reinforced Polyester Composite Badri, Muftil; Sugiman, Sugiman; Aguswandi, Aguswandi; Jayadi, Jayadi
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 40 No 1 (2017): 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.v40i1.389

Abstract

The fracture behavior of coconut fibers reinforced polyester composite depends on different fibers orientation was experimentally investigated under static loading conditions. The static uniaxial tensile and flexural loading for three (random discontinuous, longitudinal and woven direction) coconut fibers reinforced polyester composite was implemented using servo hydraulic material testing machine. The microstructure was observed using SEM observation in order to better understand damage mechanism during the stress of polyester phase. SEM observation on fracture surface can provide important information for research and development as well as fracture analysis. It was found that fracture modes were considerably different for these composites. The random discontinuous coconut fibers composite fracture caused by defects in fiber pull out, the longitudinal coconut fibers composite fracture caused by matrix cracking and delamination, the woven coconut fibers fracture caused by debonding and void. Based on the SEM observation results, the fracture behavior was determined and it was found that static loading conditions and fiber direction influence the fracture surface of coconut fibers reinforced polyester composite.

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