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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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Experimental Investigation of Cigarette Butts as a Trigger on Smoldering Combustion Propagation of Peat; Case Study on Pelelawan Peat Awaludin Martin; Yogi Wibowo Agusta; Pither Palamba
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 64 No 3 (2020): Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse)
Publisher : International Society of Ocean, Mechanical and Aerospace -scientists and engineers- (ISOMAse)

Peatland fires are a problem every year in Indonesia especially in Sumatera Island. In Riau during the dry season, there will be peatland fires that are difficult to extinguish. There are several reasons for peatland fires and this study will analyze whether cigarette butts can cause peat fires or not. In this research peat sample was dried at 35-45°C and at temperature at 115°C to reduce water content in peat samples. Cigarette butts as a trigger were prepared with a length of 30 mm and tested on a bomb calorimeter to determine their calorific values. The cigarette butts with the highest HHV (High Heating Value) were used and burned on the surface of the peat sample by adding airflow to the sample with varying flow rates. The fastest of smoldering combustion propagation velocity was obtained 785 mm/hour for vertical direction and 1336 mm/hour for horizontal direction with speed of airflow of 5 m/s. The highest temperature was obtained in the experiment of 902°C with the speed of airflow of 5 m/s.

Experimental Study of the Probability Distributions on the Seakeeping Performance of Monohull and Catamaran Design Ali, Baharuddin; Firdaus, Nurman
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 47 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)

A safety and a comfort criteria of ship, one of them which can be known from ability of the ship motion on sea wave. The development of maritime technology in particular shipbuilding, catamaran ship design is one of the considerations in modern ship design, in addition to monohull ship design. This research describes the analysis of seakeeping model test of monohull and catamaran ship. The seakeeping model test is performed on sea- state 4 with a heading of 45 deg, 90 deg, 135 deg and 180 deg. Ship motion responses in the form of heave, pitch and roll motion, are presented in the form of the probability distribution curves. From the results of seakeeping test, it can be seen that the catamaran ship provides motion response relatively smaller than the monohull ship.

Maintenance Schedule Optimization for Turnaround Hot Gas Path Inspection of Gas Turbine in North Duri Cogeneration Plant Using Impact Method Beny Hariyanto; Romy Romy
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)

North Duri Cogeneration Plant (NDC) is once of Chevron asset in IndoAsia Business Unit. The NDC location is in Duri, Province of Riau, Indonesia. The NDC has 3 units gas turbine and each unit has been combined with Heat Recovery Steam Generator (HRSG). An unit gas turbine NDC is produce electricity of 100 MW, and 1 unit of HRSG NDC that is produce steam of 360,000 BCWEPD (Barrel Cool Water Equivalent per Day). Hot gas path inspection (HGPI) is maintenance activities gas turbine, which routine scheduled in NDC every 3 years per unit. Maintenance schedule for turnaround HGPI gas turbine at NDC should be optimizing. By optimized of HGPI maintenance schedule can be maximized work plan, which is comply of 4 Key Performance Indicators there are Safety, Quality, Schedule and Cost through Initiative for Managing PACesetter Turnarounds (IMPACT). The result of optimal electricity production was increased by 13,174 MWh and the steam generated from units in NDC of mass total steam of 126,661 Mlbm and 371,827 BSPD.

Interlayer Effect on Connection of Mild Steel ST37 and Stainless Steel 201 on Rotary Friction Welding Yohanes Yohanes; Muhammad Heriansyah
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)

Friction welding is a type of solid state welding where the welding process is carried out in a solid phase to combine various types of ferrous and non-ferrous metals that cannot be welded by the fusion welding method but for welding different metals the welding results are less than optimal due to cracks on the surface of the welding results and differences in mechanical properties that cause the welding result to be brittle, therefore an interlayer is used. In this study, observations were made on the process and results of the joint friction welding using dissimilar metal material between mild steel ST37 and stainless steel 201 with copper interlayer. The results of the test will be a tensile test to see the maximum tensile strength and a hardness test to see the hardness value of the interlayer variation of 0.3 mm, 0.5 mm, 1 mm and without an interlayer. The conclusions obtained are: (1) The effect of the addition of an interlayer on the rotary friction welding process includes the friction phase, the forging phase and the results of welding parameters in the form of motor power, motor angular speed, the change in specimen length is greater without using an interlayer compared to using an interlayer while the duration of welding time is greater using an interlayer than without using an interlayer. (2) The maximum tensile test results were obtained at the 1 mm interlayer at 482.43 MPa and the maximum hardness test results obtained at the 1 mm interlayer were 321.34 VHN.

Productivity Improvement Based Systematic Layout Planning and 5S (Case Study: CV. Mutya, Indonesia) Calvin Aidil Febri; Anita Susilawati
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)

The amount of productivity had not met the target demand of customers in CV. Mutya. This happens could be due to un-optimal the facility lay out such as the distance of material working flow and un-effective the work processes. This paper aim is to improve productivity of wooden pallets product in CV. Mutya, Indonesia. The Systematic Layout Planning (SLP) method was used to improve the facility layout at CV. Mutya. To improve the work process was used 5S methods. The material transfer flow distance in the initial layout of CV. Mutya was 48.2 meters. Then, designing a new layout resulted the material displacement flow distance of 41.5 meters. Based the SLP method, to find out the root of the problem that occurs was employed the cause and effect analysis and work improvement using 5S. The 5S method was used to improve the conditions of the work environment and change attitudes by applying arrangement, cleanliness and discipline in the workplace.

Experimental Effect of Angle Variation and Speed Welding Filler Using Vertical Adaptive Sliding System In SMAW Welding Nusbir, Yohanes; Sianipar, Alfrets Marade
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)

In each welding technology each has advantages in accordance with the placement of its implementation. One of the welding technologies is the SMAW (shield metal arc welding) has an advantage over the current and the welding angle can be varied, and the penetration width of the electrode fuses can be adjusted. This research uses SMAW welding machine with sliding adaptive vertical system design for proper welding speed. this study varied the angle and speed of welding to determine the welding results of SMAW welding machine with sliding adaptive vertical system. In this study the characteristics of welding results based on visual observation and mechanical properties using tensile test. The parameters are varied angles 600, 650, and 750 and welding speed controlled arduino uno with a stepper round of 1.5 Rpm, 1.75 Rpm, and 2 Rpm. The material used is a low carbon steel, using a hometown V with 60 hill angle. In this study the highest metal tackling region is the tensile strength of 571.35 MPa and the lowest value is 475.52 MPa with the number of specimens varied by 9 specimens. Micro welding structure is determined by many factors including heat input, current strength, welding speed, and cooling rate. In this study the HAZ area has a larger grain structure than base metal and weld metal.

Study on the Phenomenon of Flood Characteristic in DKI Jakarta Koto, J; Negara, Ridho Bela; Tasri, Adek; Kamil, Insannul
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)

Since Dutch era, flood has become serious issues faced by DKI Jakarta. Study on prevention flood program has also been conducted since Dutch era. 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, slum neighborhood where scattered rubbish where quickly provoke the flood to stagnate and increase rather than receding. This flood is mainly caused by not only above factors but also land subsidence an average of 5-10 cm every year. This paper discusses on flood characteristics in DKI Jakarta. In the study, firstly history of flood was discussed started in Dutch era until after independence. It was founded that floods occur in continuous heavy rains like in January and February. There is a combination of floods caused by rain in the upstream and downstream. Previously heavy rains can cause flooding in subsequent heavy rains.

Application of Euler Method on Ice Sheet Buckling Koto, J; Afrizal, Efi; M.A, Wahid
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 55 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)

Bulbous bow ship economically has advantage during sailing in open water due to lower resistance compared with an ice bow. On the other hand, the movement of the ship gradually give load to the ice sheet, along with that, the ice sheet will react in proportion to the load of the ship. Therefore the bulbous bow ship has higher ice resistance. This paper discusses the phenomena of ice sheet buckling due bulbous bow of ice ship. The ice sheet buckling was analyzed using Finite Element Method based on Euler method. The Euler method was described from general deflection equation for a beam.

The Performance Design of Betel Nut Cutter in Rural Areas Syawaldi, Syawaldi
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)

Betel nut is one of leading agricultural commodity in Indonesia. The economic prospect of Betel Nut could support financially the people which resided in country-side to a new level of prosperity. The increasing of betel nut demand especially which derived from outside of country such as India and Thailand of the Betel Nut which is used as the raw material for medicine and cosmetic products will need new machine design of betel nut cutter to supply the demand. Current process of betel nut manufacture is still use a hand-tool for cutting the Betel Nut in rural areas. It takes lot of time and resulted low productivity. The design of the machine betel nut manufacture provides the solution to increase the productivity and low production cost because of cut in half process is still manually. This equipment can produce the cutting work with average 300 Betel Nut per hour. The force resulting from lever is 0.03 N and the cutting speed for 1 fruit only takes 4 seconds. This equipment is able to cut in half of two or three the Betel Nut in one time. This cutting machine prototype has been used widely in rural area of Riau province like village of Penyalai-Kuala Kampar, district of Pelalawan and several villages in the district of Indragiri Hilir.

Performance of Dynamometer with Sensor Type Single Bar for Measuring Drive Power of Rotary Friction Welding Machine Yohanes Yohanes; Novri Andri
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 64 No 3 (2020): Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse)
Publisher : International Society of Ocean, Mechanical and Aerospace -scientists and engineers- (ISOMAse)

This study aims to determine the performance of the dynamometer design as a measure of mechanical power on a rotary friction welding machine. The design of the dynamometer includes the design, manufacture, calibration, and testing of the dynamometer. The design and manufacture of strain dynamometers is adjusted to the motor of the rotary friction welding machine at the University of Riau's Mechanical Engineering Production Technology Laboratory. The design of the strain dynamometer has a dimension of 175 mm × 3 mm × 50 mm and serves to determine the motor torque value with the help of a 120 ohm strain gauge sensor. The device designed is equipped with an electrical microcontroller device and an optocoupler sensor to measure the angular speed of the motor. Next, the dynamometer performance testing is performed on the rotary friction welding machine. The results of testing in the rotary welding process, the greater the pneumatic pressure exerted during welding, the greater the measured power. The largest measured power value is 2452.92 Watt in the forging process, and the smallest measured power value is 2050.24 Watt in the first time of the initial motor rotation. After doing the research, it can be concluded that the tools designed and built can work and have a fairly good performance.

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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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Home Page

OAI Link

Editorial Team

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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

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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