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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 329 Documents

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Population Data of Commercial Ships in Indonesia for Supporting Sea Toll Program and World Maritime Fulcrum Soetardjo, Meitha; Bisri, A
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 46 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 economic condition of a country is not separated by natural resources as a provider of human needs Indonesia is a maritime country that most of its territory in the form of waters. The shipyard industry is a maritime undertaking whose activities build a new ship, ship maintenance, ship repair etc. The growth of shipbuilding industry in line with the rapid growth of iron and steel mining and advances in machining technology in the late 18th and early 19th centuries. This has made the shipbuilding industry progressing rapidly to date. For preliminary data as a guideline for increasing shipyard capabilities to produce new vessels including docking, it is necessary to inventory the current condition of the shipyard. The shipbuilding industry is one of the maritime industry based on the technology chosen by the government to be developed related to the realization of the maritime shaft program. The technological conditions in the conventional national shipyards that are still not convincingly resized, require the evaluation process to produce a plan and the realization of targeted improvements. The development of the national maritime industry as a solution of the Indonesian government's program to improve the national shipping capability in the transportation of goods and inter-island passengers. The need for vessels in large quantities to exploit existing marine potentials, the need for a fleet of vessels to become goods transport and passengers connecting between islands and between countries, the need for ships for marine and coastal protection, and the need for other special vessels is an urgent matter to be met. Consumers who require shipbuilding services include oil companies, shipping, tourism, transportation, etc. The results of the shipping industry in shipbuilding activities are tankers, ferry boats, fishing boats, yachts, etc.

Manufacture and Strength Analysis of Ergonomic Bicycle Helmet Made from Polymeric Foam Composite Strengthened by Oil Palm Empty Fruit Bunch Fiber with Free Fall Drop Test Method Mahadi Mahadi
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)

This article contains a study report on the manufacturing of bicycle helmet models that use polymeric foam composite materials strengthened by oil palm empty fruit bunch (OPEFB). The test results of mechanical polymeric foam obtain tensile stress (σt) 1.17 MPa, compressive stress (σc) 0.51 MPa, bending stress (σb) 3.94 MPa, modulus of elasticity (E) 37.97 MPa, density ( ρ) 193 (kg / m3). The testing results of thermal conductivity (k) with ASTM C177-04 standard obtain 0.096 W/mK. Aerodynamic simulation is carried out on 5 bicycle helmet models with different variations of air ventilation formations and obtained the M4A model that best met the ergonomic criteria. The simulation results of the M4A helmet model are max 65.668 Pa of air pressure (Pu), 26,8 0C of inner wall temperature (Ti), 11.0724 m/s of air velocity (vi) and 0.89 of drag coefficient (CD). Bicycle helmet manufacturing is carried out by hand lay up method for shell layer and casting mold for liner by using GFRP polymer composite molds. Both layers are made by sandwich method with the composition of the shell layer is 100 grams resin, 15 grams glass fiber and 5 grams catalyst. The composition of the liner layer is 275 grams (50%) of unsaturated Polyester 157 BQTN-EX resin, 27.5 grams (5%) of OPEFB fiber, 247 grams (45%) of Blowing Agent Polyurethane and 27.5 grams (5%) of Methyl Ketone Perokside catalyst (MEKPO). The toughness of the helmet is tested by using a free fall drop test with the standard of Consumer Product Safety Commission (CPSC) with the height of impact 1.5 meters. The free fall drop test results are max 2.02 MPa of the impact stress of the M4A bicycle helmet model (σi) and max 283.77 joules of energy impact (Ei) which is close to the Consumer Product Safety Commission’s (CPSC) standard value of 110 joules.

Failure Mode and Effect Analysis (FMEA) of Pneumatic System of CNC Milling Machine Yudi Dwianda
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 purpose of this study is to determine the type of failures, the causes, as well as efforts and proposed actions that can be taken to improve the performance of the pneumatic system of CNC milling machines. The Failure Mode and Effect Analysis (FMEA) method is used to find priority problems through Risk Priority Number (RPN) for pneumatic system of components of CNC milling machine. The results of critical component analysis were a leakage occurs in pneumatic valve component, which the most critical risk of the RPN value. It potential failure was caused the high humidity and poor air quality from the compressor, which the RPN of 392 and 384 respectively. The proposed improvement was the replacement of damaged components and optimizing the preventive maintenance, which follow the right operation and maintenance procedures recommended as suggested by the manufacturer.

Design of Pin On Disc Tribometer Test Equipment Using the Hatamura Method Dedi Rosa Putra Cupu; Oktaviandi Adeka Putra
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)

To determine the rate of wear and coefficient of friction, a test instrument is used, namely a tribometer with a pin on disc type. Before manufacturing, it is necessary to have a design that must comply with existing standards. This study aims to design a pin on disc tribometer with circular motion and reciprocating linear motion using the Hatamura method and its main components, analyze the shaft and frame and produce working papers in the form of technical drawings and bill of materials in the manufacture of test equipment. Pin-on-disc tribometer. In this study, designing several concepts of the pin on disc Tribometer according to the Hatamura method and then evaluating the existing concepts and selecting concepts based on the decision matrix, then the concepts will be designed and analyzed by manual calculations and validation using Autodesk Inventor to determine stress, deflection, as well as safety factors on the axle and frame. The final result of this research is a technical document in the form of layout drawings and assembly drawings as well as detailed drawings of each component and bill of materials.

Sieving Machine Calibration Using a Profile Projector with Standard Method ASTM E-11 2004 Badri, Muftil; Arief, Dodi Sofyan; Solih, Aji Mahmud; Ayunita, Dyna; Muflihana, Afdila
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 57 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)

Sieving machine is used to sift material of sand and stone previously mixed. Sieve machine is a measuring instrument to determine the size of sand grains that can be used in building construction. The purpose of this research is to calibrate the sieving machine using profile projector with standard method ASTM E-11 2004. Based on this research, the conclusion of calibration data of sieving machine has been obtained. It was found that the sieving machine used in this research can be used to determine the size of sand grains used for construction. The uncertain value of the width opening sieve is 15.8 Î¼m and the diameter of wire is 0.02 mm, so that the value of evaluation is lower than the allowed geometry deviation limit. Thus it can be concluded that the sieve machine is still within the permissible geometry tolerance limit.

Study on Rivers Pollution and Water Quality in DKI Jakarta Koto, J; Negara, Ridho Bela
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 52 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)

As many other cities in the world, DKI Jakarta faces serious problems in the flood. In rainy season, common flooding is caused by several factors as follows: lowland areas in the northern part of Jakarta below sea level, urbanization rate, irregular population density, river pollution, slum neighborhood where scattered rubbish where quickly provoke the flood to stagnate and increase rather than receding. This paper studied on rivers pollution in DKI Jakarta. It was founded that water quality from 13 rivers in DKI Jakarta was at a critical level. The lack of sanitation systems in residential areas around rivers has highly contributed to pollute the rivers. It was 96 percent of the water is badly polluted. Therefore river water in DKI Jakarta can be harmful to health if consumed by the community.

Performance of Universities based on Research Output Koto, J; Syukri, M; Sofyan Arief, Dodi
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 61 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)

Performance of universities based on research ranking has become a trend to gauge the credibility and quality of the university. One of the parameters used to assess university ratings is the result of research in the form of papers, patents, copyrights. Therefore, universities in the world compete to publish research results in the form of journals or conferences and others. This paper discusses on performance of universities based on research output. The results of research index in developed countries shows that there is not much change from year to year, it may be said that it almost reaches a saturation point. On the other side of the earth, the increase in research results in ASEAN countries is still high, reaching 70-80 percent. More impressive, universities in Indonesia have tried very enthusiastically in the study as the percentage increase was 500%.

CFD Analysis of Unsteady Yaw Motion of A Towed Ship Fitriadhy, A.; Mansor, N. Aqilah; Aldin, N. Adlina
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 49 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)

Instability of a towed ship presented in the form of her unstable yaw motion may lead to serious accident especially at the restricted waterways such as colliding with other ships or onshore structures. To stabilize this unsteady yaw motion, a comprehensive investigation is then required to ensure a safety of ship's towing navigation. This paper presents a computational fluid dynamic (CFD) approach to analyse yaw motion characteristics of a towed ship incorporated with an asymmetrical bridle towline model. Several towing parameters such as towing's angles and speeds have taken into account. Here, a towed ship or barge in then called as 1B is employed in this simulation. The results revealed that the subsequent increase of towing's angle dealt with a better yaw motion of 1B indicated by sufficient reduction of her sway motion associated with more steady yaw motion of a towed ship.

Development of Dynamometer Based on Strain Gauge with Sensor Rod Type Four Square Stalk to Measuring the Drive Power of Rotary Friction Welding Machine Yohanes Yohanes; Muhammad Rahdiyat Alqolbi
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)

Friction welding is a type of solid state welding where the welding process is carried out in the solid phase. In the welding process there are several components that work, namely the electric motor as the main mover. This study aims to developmant a dynamometer to measure the mechanical power of a rotary friction welding machine. Dynamometer development includes the design, manufacture, calibration and testing of dynamometers. Dynamometer design that will be placed on the holder that serves as a stretch bar. Dimension of the strain dynamometer is 35 mm × 4 mm × 70 mm and serves to determine the motor torque value with the help of a 120 Ohm strain gauge sensor and to measure power it needs an additional speed sensor or optocoupler sensor to measure the motor angular speed. In need of making a microcontroller or an electrical device. Finally, the dynamometer testing process on a rotary friction welding machine. When the welding process takes place, the greater the pneumatic pressure exerted during welding, the more measurable the power is. The largest power value measured in the forging phase is 2408.50 Watts and the smallest power measured by the dynamometer is 2050.24 Watts at the initial rotation.

Automatic Task Machine (ATM) Design for Logistic Package by Method Analytical Hierarchy Process (AHP) Through Approach the Design for Manufacturing (DFM) Deni Pranata; Dodi Sofyan Arief
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 Automatic Task Machine (ATM) machine for logistics packages is a machine vision to measure the dimensions and other components in form load cell, which serves to measure the mass of an object. This machine design was development the addition of components such as insert card, screens, navigation buttons, receipt printers, automatic package doors and a storage room delivery mechanism. Method of Analytical Hierarchy Process (AHP) was chosen to determine the ATM design for the optimal logistics package for the best alternative decision. The questionnaires were made to get priority consumer needs, which it used for the initial design. The consumer needs questionnaire was based on several indicators, namely: ergonomics, measurement of dimensions and weight, package transmission and package storage. The next stage was selecting the optimal design using AHP, which involves Expert based on the indicator of a product. The highest indicator value obtained for the logistics package ATM is "dimension and weight" with a value of 5.22 and the optimal design choice was "alternative 3". The optimal design choice was analyzed using the Design for Manufacturing (DFM) approach to consider the cost of manufacturing product, which aims to minimize the cost of making ATMs for logistics packages.

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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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Home Page

OAI Link

Editorial Team

Contact

Reviewer

Google Scholar

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

Abstract

Abstract

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Abstract

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