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Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse)

jomase
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Published by Universitas Riau

ISSN : 23547065 EISSN : 25276085 DOI : http://dx.doi.org/10.36842/jomase

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 135 Documents

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High Sensitivity Biosensor Designed by Graphene on Insulator MZI Waveguide Dedi Irawan
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 53 No 1 (2018): 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 | Full PDF (379.263 KB)

We designed a high sensitivity optical biosensor based on Mach-zehnder Interferometer (MZI) by covering the silica waveguide with single atomic layer of graphene material. Graphene was applied to the arm of MZI in certain length. The upper arm was set an important key as the reference signal. The sensor sensitivity was determined mathematically from the power difference launched at the output ports. Our results shows novel optical absorption of hybrid waveguide applied in MZI arm. The presence of sample, which induces the effective index of the hybrid waveguide, significantly changes the phase of light propagation and the power ratio at the output ports which determines the sensitivity. Finally, we showed the effect of the distance between the graphene to the core and the length of graphene on waveguide of MZI.

Buckling and Deflection of Ice Sheet Caused by Ship J Koto; Efi Afrizal; Wahid M.A
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 62 No 1 (2018): Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse)
Publisher : International Society of Ocean, Mechanical and Aerospace -scientists and engineers- (ISOMAse)

The movement of ice ship gradually gives load to the ice sheet, along with that, the ice sheet will react in proportion to the load of the ship. The phenomenon of interaction between ice and hull of ship has been studied by researchers through empirical mathematical simulation and experiment. This paper discusses the phenomena of ice sheet buckling and deflection caused by a ship sailing in ice level. The ice sheet buckling and deflection is analyzed based on using Finite Element Method based on Euler and Cantilever methods. The methods were described from general deflection equation for a beam. Simulation was carried out using Abaqus running ahead and astern at several speeds of 0.4m/s, 0.5m/s and 0.6m/s.

Fracture Surface of OPEFB Fiber Reinforced Polymer Composites-Polymeric Foam Sandwich Panels under Static Loading Conditions Muftil Badri; Dodi Sofyan Arief; Erik Sitio Johanes; Ridho Zarli Rahmat
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 48 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)

The fracture surface of oil palm empty fruit bunch (OPEFB) reinforced polymer composites sandwich panels depends on different fibers treatment was experimentally investigated under static loading conditions. The static uniaxial tensile and flexural loading for three treatment modes on OPEFB fibers 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. OPEFB fibers was soaked with 5% NaOH solution for 2 hours are not removed from the matrix composite. It means the interface bonds of OPEFB fibers can be controlled against the polymer matrix. Damage to polymer matrix interface and OPEFB fiber are boiled with water at temperatures of 50º C to 80º C for 30 minutes due to flexural test.

Innovation of Elbow Fixture Welding Process Based on Design for Manufacture and Assembly (DFMA) Novri Yunus; Anita Susilawati
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 64 No 1 (2020): Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse)
Publisher : International Society of Ocean, Mechanical and Aerospace -scientists and engineers- (ISOMAse)

The elbow fixture in the welding process is a supporting tool to holder the work-piece in the welding process. This tool is made in Do It Yourself (DIY) in micro-business. However, in its application there are problems. The solution provided to overcome these problems is the development of tools with the Design For Manufacture and Assembly (DFMA) method. The goal is to create a portable device design that is easy to carry and to calculate the time and cost of the manufacturing process and welding fixture assembly. The development of tools is carried out by looking for more complex problems through a consumer need questionnaire and a product development questionnaire. Data obtained from the development questionnaire can be used as a concept design (sketch) for analysis based on DFMA. The DFA (Design For Assembly) is carried out to simplify the assembly design and facilitate the assembly process. The choice of material is the basis for the quality of the product. The DFM (Design For Manufacture) is done to determine the component manufacturing process design, calculate the cost of materials and manufacturing costs. From the DFMA process, an innovation design for the welding process consists of 22 components with 12 different types of components. The design of innovative elbow aids in the welding process is called adjustable angles welding fixture. The cost used to manufacture this tool is Rp. 87,953 and the assembly and manufacturing time is 97 minutes 47 seconds.

Production Process of Front Lights on Anoa 2 6x6 Special Vehicles at PT. Pindad (Persero) Abdul Khair Junaidi; Nandha Syamza; Tri Subagyo
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 65 No 1 (2021): Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse)
Publisher : International Society of Ocean, Mechanical and Aerospace -scientists and engineers- (ISOMAse)

The headlights on Anoa 2 6x6 special vehicles are used for street lighting for anoa tanks at night. The purpose of this study was discussed the steps of production process of the Anoa 2 6x6 headlights in PT. Pindad. The headlight component was made in several manufacturing processes that were carried out. It consists of many parts, which a variety of production machines for the manufacture of each part. The manufacturing of the headlight components using machining processes such as laser cutting, welding, and drilling. The type of material used for the manufacture of the headlights and parts that was Aluminum Alloy 2044 and Steel ST-37. The result components were made the headlight frame, BT protectors, the front, side, and rear components.

Effects of Oil Palm Trunk (OPT), Peat and Coconut Shell Charcoal on the Characteristics of Biomass Pellet Muftil Badri; Dodi Sofyan Arief; Iwan Kurniawan
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 66 No 1 (2022): Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse)
Publisher : International Society of Ocean, Mechanical and Aerospace -scientists and engineers- (ISOMAse)

This paper presents an experimental study of mass percentage and pretreatment effect of oil palm trunk (OPT), and peat charcoal on energy parameters of biomass pellet. The density, calorific value, moisture and ash content of OPT biomass pellet has been developed and the experimental conditions in obtaining the energy parameters of OPT biomass pellet are discussed. The physical pretreatment was carried out by finely chopping OPT, peat charcoal, and adhesive and mixed in a predetermined composition. The manufacturing process of OPT biomass pellet was performed, the mass percentage of OPT and peat charcoal were varied. Type of test was performed on biomass pellet include density, calorific value, moisture and ash content. The influences of various parameters on the characteristics of biomass pellet were considered. The increase of mass percentage and pretreatment of peat charcoal has an effect on increasing the density, decreasing the calorific value of OPT biomass pellet, increasing the moisture content, and increasing the ash content of OPT biomass pellet. The mixture of coconut shell charcoal decreasing the density, increasing the calorific value, decreasing the moisture content, and decreasing the ash content of OPT biomass pellet. Biomass pellets from a mixture of OPT and coconut shell charcoal has a calorific value of 6649 cal/g, where the density was 1.15 g/cm3, the moisture content of 5.6%, and the ash content of 8.9%.

An experimental investigation of tensile strength and impact energy of polymeric foams-OPEFB fiber sandwich panels composite Muftil Badri Badri; Dodi Sofyan Arief; Erik Johanes Sitio; Ridho Zarli Rahmat
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 59 No 1 (2018): 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 | Full PDF (1370.961 KB)

This paper discusses about an experimental investigation of tensile strength and impact properties of polymeric foams-OPEFB fiber sandwich panels composite with various directions of palm empty fruit bunches fiber, vacuum pressure, and foam thickness. In this study, the manufacture of specimens with different fiber directions will then be tested and analyzed for each direction of fiber. The results of the analysis of composite specimens in the study were evaluated and compared with each other. The purpose of this study was to obtain impact energy and tensile strength of composite plates. In the manufacture of sandwich panel specimens carried out by varying the pump pressure, foam thickness, and the direction of the preparation of the fiber and carried out by the vacuum method. From the test results, it was found that the highest tensile strength was composite specimens with vertical fiber direction is specimens with three vertical panels of fiber direction, vacuum pressure 6 cm Hg, and foam thickness is 1.5 mm with tensile strength is 22.5 N/mm2, while the highest impact energy is the specimen with vertical fiber direction is the specimen with the fiber direction of the three vertical panels, the vacuum pressure is 6 cm Hg, and foam thickness of 1.5 mm with an impact price of 0.16 J/mm2. From this study it can be concluded that the fiber direction is 53% higher than the direction of the combined fibers vertically, horizontally, and vertically in absorbing impact loads, also 83% higher than the vertical, 45⁰, and horizontal combined fibers in absorbing impact loads It also has a tensile strength of 10% higher than the vertical, horizontal and vertical combined fiber direction, also has a tensile strength of 15% higher than the vertical, 45⁰ and horizontal combined fiber direction.

Hydroxyapatite Bilayers Coating on Screw Implant Ti6Al4V ELI with Electrophoretic Deposition Method for Improving Osseointegration Dian Juliadmi; Dili Oktaviana; Djong Hon Tjong; Menkher Manjas; Gunawarman Gunawarman
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 51 No 1 (2018): 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

Utilization of an alloy titanium (particularly Ti6Al4V), as fracture fixation in biomedical application has restriction because of will associate with osseointegration failure. An effort to titanium coating by hydroxyapatite monolayer still has poor mechanical properties and may lead to implantation failure. Hydroxyapatite bilayers coating aims to protect releasing hazardous ions from implant to the body and improving the osseointegration at the same time. In this research, nanoparticle hydroxyapatite (first layers) and microparticle hydroxyapatite (second layers) were used as coating materials on implant prototype of Ti6Al4V ELI screws. The coating was carried out by electrophoretic deposition (EPD) method used different voltage (2 and 3 volt) for deposition time of 2 and 3 minutes for forming first layers. The process was then continuing for making second layer at 5 and 10 volt for 2 and 5 minutes. In order to intensify of coatings, hydroxyapatite bilayers-coated titanium was air-dried overnight and then sintered at 700oC for 1 hour. The coating layers were characterized by optical microscope, Scanning Electron Microscope (SEM) and thickness gauge series tester. Result of the study show that nanoparticle hydroxyapatite layers are more uniform, thin, dense than microparticle hydroxyapatite layer. Moreover, the second layer shows less adhesion. The obtained voltage and deposition time for best bilayers coating characteristic are 2 volt/3 minutes for nanoparticles hydroxyapatite and 5volt/5minutes for microparticles hydroxyapatite. By approximately 71%-100% surface coverage and 56 µm thickness of bilayers coating, that parameters can be considered to improve osseointegration

Analysis of Marine Current Turbine Placement Location in Suramadu Bridge - Indonesia Ahmad Syafiul Mujahid; Erwandi Erwandi
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 60 No 1 (2018): 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 | Full PDF (880.491 KB)

Marine current turbine is a system of marine current power plant to produce renewable electrical energy derived from marine currents. After marine current turbine successfully tested in Larantuka Strait in 2010,, then in 2015 marine curent turbine team from BPPH-BPPT has conducted a study for placement of marine current turbine test that located in Suramadu Bridge, Madura Strait, East Java, Indonesia. This study uses survey data technique by direct measurement; Type of survey that is conducted using sampling technique by sampling method: purposive sampling or judgemental sampling. the subject of sampling data is marine current velocity data and ocean depth data which is chosen by researcher in the waters around the pile 56 to pile 57 under Suramadu Bridge. Measurements were conducted using instruments measurement: portable sounder, flow meter, and GPS. The measurement showed average depth: 11.4 meters and average marine current velocity: 1.3 m/s. By using the Betz Law Equation then the largest electric power can be obtained: 4.507 kW that located at 4.5 meters from pile 56 location. The Computational Fluid Dynamics (CFD) simulation is conducted to obtain the position of marine current turbine placement in order that turbine blades can rotate at optimum marine current speed. The optimum placement result of marine current turbine is located at 6.3 meters from piles 56 to the center of turbine, and the furthest distance from pile 56 to the turbine blade is 8.1 meters.

Experimental Study of Polyester Mooring Lines Nur Aireen bt. Amran; Jaswar Koto; C.L. Siow
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 50 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)

Mooring lines have several types of material which is chain, wire, synthetic fiber rope and hybrid. 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 discussion on experimental of hybrid mooring lines for deep water mooring line. The tensile tests 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 3mm, 4mm, 5mm and 6mm. Finally, the conclusion and important summaries were presented according to the data collected.

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Home Page

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Editorial Team

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Contact Name Anita Susilawati

Contact Email anitasusilawati@lecturer.unri.ac.id

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Journal Mail Official jomase@isomase.org

Editorial Address Teknik Mesin, Fakultas Teknik, Universitas Riau Kampus Bina Widya, Jl. HR. Soebrantas Km. 12,5 Panam, Pekanbaru 28293, Riau, INDONESIA

Location Kota pekanbaru, Riau INDONESIA

Abstract

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Contact Name
Anita Susilawati

Contact Email
anitasusilawati@lecturer.unri.ac.id

Phone
-

Journal Mail Official
jomase@isomase.org

Editorial Address
Teknik Mesin, Fakultas Teknik, Universitas Riau Kampus Bina Widya, Jl. HR. Soebrantas Km. 12,5 Panam, Pekanbaru 28293, Riau, INDONESIA

Location
Kota pekanbaru,

Riau

INDONESIA