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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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Soil Investigation for Determining Aquifer Position at PasirImpun Area, Bandung, West Java Using Resistivity Method Wenner Configuration Parwatiningtyas, Diyan; , Dasmo; Sjamsuri, Achmad
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 27 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.v27i1.426

Abstract

At this time, we owning many geophysics methods that can be used to optimize investigation and natural source exploration under layer surface, one of them isGeoresistivity method. Georesistivity method is one of geophysics method that study about electricity in the earth and also to detect an object in the surface layer area of earth. The following, a technology is showed to investigation and analyzed aquifer at botanical garden area, Mekarmanik village, PasirImpun, East Bandung West Java, using Georesistivity method, Wenner Configuration. In this research, will be do Georesistivity method with Wenner configuration and be processed with using inversion from software Res2DIV, and Isopach aquifer contour mapping, which previous be done the topography correction. Based on the inversion obtained, we be obtain to interpret some points which showed aquifer position, are as follow : 1). Line 1 on location 1, with the distance of extend is between 78 – 140 metre on surface layer. (It has medium aquifer) which the resistivity is 800 ohm metre, and also has porosity and volum value 25% and 945,9 m3 with the depth is 60 metre. Its formation rocks at this location are sandstone, and limestone, anticline topography, dominated by normal fault which the trend is NE-SW. 2). Line 6 on location 1 (The highest aquifer) with the distance of extend is between 26 – 182 metre 26 - 160 metre, which the resistivity is 100 – 300 ohm metre, porosity and volum value are 14,14 – 18,26% and 1160,85 m3, with the depth target is 70 metre. Its formation rocks at this location are sandstone, alluvial and limestone, syncline topography, dominated by normal fault which the trend is NE-SW. And then the third is line 8 on location 2 with the distance of extend is between 26 – 182 metre, the resistivity is 100 ohm metre, which its porosity and volum are 14,14 %, and 264 m3, with depth target is 35 metre. It has undulation topography which the trend is SE – SW dominated by normal fault, and its formation rocks are tuff, sandstone, gravel formation.
Optimization Design and Hydrodinamic Test on Propeller Mini Submarine Asrowibowo, Nurwidhi; Indiaryanto, Mahendra; , Rina
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 27 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.v27i1.425

Abstract

The defense equipment technology development which is in this case is the submarine research became an important subject and need to be further researched. One part of it is, designing driving components (propeller) of a mini-submarine with a high level of efficiency. Test models of mini-submarines of 22 m was used as a basis for developing propeller through scale models with the scale factor of 1:7. Expected propeller design optimization is capable of producing high effisensi currently working on the operational speed propeller. This research method is based on the results of the propeller design optimization, numerical simulations using Computer Fluid Dynamic (CFD ) and hydrodynamic test. The results of this study shows that the method applied here could provide a solution in the choice of an efficient propeller designs for mini-submarines 22 m.
The Hummingbird System: A Theoretical Propulsion Mechanical Device Ibarra, Alvin
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 27 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.v27i1.424

Abstract

A propulsion mechanical device is a type of system that is claimed to produce net external thrust by using just the motion of internal components. Despite recent efforts to develop such a device, only a scientifically sound proposal would be an option to develop practical systems in the future.This review presents a theoretical propulsion mechanical device, called the Hummingbird System, which is summarized in several concepts to describe its performance. These concepts include the Basic Model to explain the generation of thrust, the Continuous Model to allow a constant generation of thrust, the Basic Unit to compensate the torque and direct the thrust, and a proposal to cluster several Basic Units to displace an object in space. Some potential applications of the Hummingbird System are also discussed, suggesting its use in naval, artificial satellite, and spacecraft propulsion systems. The ultimate aim of this review is to encourage the design and development of novel propulsion devices that are based on the Hummingbird System. The theoretical concepts that are described in this review remain to be confirmed in practice.
Integrated Port Traffic Management using Automatic Identification System and Radar Amran, Nur Aireen; Koto, Jaswar
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 28 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.v28i1.423

Abstract

In Vessel Traffic System (VTS), AIS can detect a larger number of targets without considering the shadow effect and can provide more voyage information for port center. For radar system can detect target actively even buoys or rock no matter ship size or fitted equipment. But even radar can detect all targets, it is cannot give full information as AIS. AIS can give full information such as types of ship, size, name, MMSI number and etc. AIS and radar system is very important in the VTS to control ship in and out at the port area. They have to use two different computers, which is one computer for AIS and another computer is for radar systems. By integrating AIS and radar, the officer can control port with more accurate and systematic. This paper will focus on integration of AIS and Radar for managing the movement of vessels in port for safety purpose by taking Port TanjungPelepas (PTP) as a case study.
Integrity Assessment of Cracked Pressure Vessel with Considering Effect of Residual Stress Based on Failure Assessment Diagram Criteria Akbar, Musthafa; Setiawan, Rachman
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 28 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.v28i1.422

Abstract

During the period of its operation, a pressure vessel may experience excessive loading which can cause crack defects. Integrity analysis needs to be carried out to evaluate the feasibility operation of that cylindrical pressure vessel with defects. In this paper, integrity assessment of cracked pressure vessel under internal pressure and tensile residual stress was conducted based on failure assessment diagram criteria. This criteria applied widely and adopted in API 579-1/ASME FFS-1 2007 Code. There are three assessment levels provided in code. Level 1 and 2 assessment performed using analytical calculation while Level 3 assessment is conducted using finite element method. On a case study, failure criteria for the integrity analysis is based on the Failure Assessment Diagram (FAD), that distinguish safe and unsafe region based on two failure criteria, namely brittle fracture and ductile fracture. This diagram is built using finite element method with the assumptions of both Linear Elastic Fracture Mechanics (LEFM) and Elastic Plastic Fracture Mechanics (EPFM). Based on Level 1 assessment, the pressure vessel under study is not recommended to be operated, whilst based on Level 2 and 3 assessments the pressure vessel is considered acceptable. This study concludes that Level 1 and 2 analysis provide more conservative results when compared with level 3 analysis. Failure Assessment Diagram for Level 3 analysis relatively more conservative at elastic-plastic region (0.4<Lr<1), but less conservative at plastic collapse region. Parametric studies performed with increasing operating pressure and size of defects. Based on analysis, failures of the pressure vessel occur at pressure of 403 psi and an aspect ratio of 0.18 for analysis with including the effect of tensile residual stresses. Meanwhile, if the analysis is done by ignoring the effect of residual stress, pressure vessel failed at pressure of 589 psi and leak when aspect ratio reaching 0.42.
The Effect of Deformation on Wear Behaviour of 5% Fly Ash Particle Reinforced Al-10Mg Alloy Matrix Nano Composites Synthesized by Stir Casting Katrenipadu, Srinivasa Prasad; G, Swami Naidu
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 28 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.v28i1.421

Abstract

Aluminium alloy matrix composites attract much attention due to their lightness and moderate casting temperatures. Among the various reinforcements used in composite material, fly ash is one of the most inextensible and low density reinforcements available in large quantities as solid waste by-product obtained from combustion of coal in thermal power plants. The micro sized fly ash particles have been reduced to nano structured fly ash using High energy ball mill and the size was reduced from 53µm to 27 nm after 30 hours of milling,. Cast Al-10 wt% Mg is used as matrix to yield improved strength. Composites were fabricated with Micro and nano structured fly ash particles reinforced with Al-10Mg alloy matrix by stir casting and experiments were conducted under laboratory conditions to assess the wear characteristics of Al- 5 wt% fly ash (micro sized) and Al- 5 wt% fly ash (nano structured) composites under different working conditions in pure sliding mode on a pin-on-disc machine. The composites were given different deformations by upsetting and the effect of deformation on wear behaviour is determined in the present investigations. The wear rate of the composites was decreased with deformation and for deformations beyond 30%, the wear rate was increased due to strain softening. The increased frictional thrust at higher load results in increased debonding and caused easy removal of material and hence the wear rate is increased with increase in normal load. The coefficient of friction in all the cases is decreased with the increase of normal load. This is attributed to the wear of the matrix from the pin surface leaving the particulates standing proud.
A Measurement Method of Corrosion Rate in Condensate Pipeline Using Long Range Ultrasonic Test Badri, Muftil; Ansukarto, Iswan; Puspito, Wismo
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 28 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.v28i1.420

Abstract

The pipeline is one of the important means necessary as the transport medium of oil and gas, so that when the pipeline leak would greatly disrupt the production process. Pipelines generally use carbon steel, a major problem in the use of carbon steel is corrosion. Therefore, there must be serious action to prevent and simultaneously tackling the corrosion. In this study, the method used to measure the rate of corrosion is LRUT, this method is the latest technology in Indonesia in the field of inspection of corrosion rate. By using ultrasonic waves, this method will detect a reduction in the thickness of the pipe (wall loss), which is then used as the primary data to calculate the corrosion rate. The following conclusions were obtained: (1) Measurement of corrosion rate by using LRUT method can detect corrosion of the inner and outer walls of the pipe, the testing process faster, efficient and more extensive inspection area when compared with conventional methods. (2) The rate of corrosion on the circuit pipelines are not the same, it is in line with the magnitude of wall loss that occurs in a series of pipelines that are influenced by internal and external factors such pipes. (3) In general, a series of pipelines that have been tested using the method LRUT have decreased performance with a reduction in the thickness of the pipe wall. The greatest reduction in thickness occurs in TP # 02, anomaly number 13 with the corrosion rate of 0237 so that the estimated remaining life at that point was 19.49 years.
Development of Automatic Identification System in Straitof Batam-Singapore Koto, Jaswar; Amran, Nur Aireen
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 29 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.v29i1.419

Abstract

In Vessel Traffic System (VTS), AIS can detect a larger number of targets without considering the shadow effect and can provide more voyage information for port center.AIS can give full information such as types of ship, size, name, MMSI number and etc. AIS system is very important in the VTS to control ship in and out at the port area. This paper discussed on development of AIS system. The system was applied for safety purpose by taking ship tracking in Strait of Batam-Singapore.
Comparison of Fuzzy AnalyticHierarchy Process and Analytic Hierarchy Process Based Decision Support for a Lean Performance Measurement System Susilawati, Anita; Tan, John
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 29 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.v29i1.418

Abstract

A performance measurement framework for a company that adopted lean manufacturing is needed to measure their achievement in the implementation of lean manufacturing system.A comprehensive design of the performance measurement framework requires an understanding of all the elements including performance of perspectives and key indicators of measurements, anddecision support methods such asFuzzy Analytic Hierarchy Process (FAHP) and Analytic Hierarchy Process (AHP).The comparison of original AHP and FAHP methods in term of decision making for lean manufacturing performance measurement system was performed in this paper. A benchmarking to compute performance based on weight between FAHP and AHP was done as a case study in automotive company. The result of the weight values of AHP and FAHP methods indicatedalmost similar among performances of lean perspectives and indicators for the company’s case study.
Hydrodynamic Modeling of Water-Entry of the Wedge Shape with Considering Asymmetric Impact Ghassemi, Hassan; Rayatpisheh, Ali; Ta’abbodi, Navid
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 29 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.v29i1.417

Abstract

The slamming of the planing crafts is the most important structural phenomenon that a vessel is encountered during their career. Many researchers have investigated this phenomenon in various methods. In this paper we investigated the analytical results of impact of symmetrical wedge to the water surface briefly, then the asymmetric impact of a 2D section of a wedge to the water surface was studied. To analyze above phenomenon, we used a numbers of analytical relationships that summarizes how to achieve these equations. Finally, obtained analytical relationships were used to determine the pressure distribution and maximum value on a wedge with different deadrise angles. The results indicated good agreement between the obtained results and results of other researcher’s studies.

Page 27 of 33 | Total Record : 329

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