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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: Split Beam Echo Sounder in Acoustic Systems for Determine Abundance of Fish in Marine Fisheries Lubis, Muhammad Zainuddin; Surya, Ganda; Timbang, Dirgan; Rizki, Fajar; Ardian, Sandi; Hanafi, Aditya; Ariwinata Saragih, Diaz; Pradipta Ramdhani, Bayu; Novanto, Perdi; Ependi, Fikriansyah; Nofranda, M Andrew; Apriliani, Dhilla; Lestari Situmorang, Arini Dewi
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.v40i1.388

Abstract

In the ocean, acoustic waves are transmitted into the subsurface ocean will experience scattering (scattering) caused by marine organisms, material distributed, the structure is not homogeneous in seawater, as well as reflections from the surface and the seabed. Estimation of fish stocks in the waters wide as in Indonesia have a lot of them are using the acoustic method. The acoustic method has high speed in predicting the size of fish stocks so as to allow acquiring data in real time, accurate and high speed so as to contribute fairly high for the provision of data and information of fishery resources. Split beam echo sounder comprises two aspects, and a transducer. The first aspect is the high-resolution color display for displaying echogram at some observations and also serves as a controller in the operation of the echo sounder. The second aspect is transceiver consisting of transmitter and receiver. The echosounder divided beam first inserted into the ES 3800 by SIMRAD beginning of the 1980s and in 1985 was introduced to fishermen in Japan as a tool for catching up. Split beam transducer is divided into four quadrants. Factors that contribute affect the value of Target Strength (TS) fish Strength target can generally be influenced by three factors: a target factor itself, environmental factors, and factors acoustic instrument.
Review: New Engine Simulation Structure Model Applied to SI Engine Nekooei, Mohammad Javad; Koto, Jaswar
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.v40i1.387

Abstract

High ratio emissions that outcome from incomplete combustion cause air contamination, poorer the performance of the spark ignition (SI) engine and raise fuel consumption. Uncompleted combustion emitted a high ratio of CO, HC, NOx and PM harmful emissions such as come into atmosphere. This study has reviewed existing engine simulation structures using different methods as s as follows Neural Networks (NN), Sliding Mode Control (SMC), Proportional–Integral (PI) Predictive Control (MPC) and DRNN-based MPC method. The existing engine models were compared with the new engine simulation structure model which was proposed by the authors, using Hybrid Fuzzy Logic Control (HFLC) method in term of AFR. The simulation engine model in Matlab/Simulink using new engine simulation has founded that AFR (15.02, 14.4) which closes to the stoichiometric value of 14.7 compared by using Neural Networks (NN) method, a Sliding Mode Control (SMC) method, a Proportional–Integral (PI) control method, Model Predictive Control (MPC) method and DRNN-based MPC method.
Numerical Study of Finite Element Analysis (FEA) of Stress and Deformation in Strainer Haiqal, Muhammad; Akhyan, Amnur; Zaira, Jupri Yanda; Novison, Roni; Rianto, Rifan; Razali, Mohd Azahari bin
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 69 No 2 (2025): 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.v69i2.545

Abstract

Transportation of hydrocarbon gas in industry often carries contaminants such as scale, rust, and weld metal particles that can disrupt the flow and damage components such as compressors. Strainers are used to filter impurities before the fluid enters the main system. At high flow rates, strainers, especially perforated plates, are susceptible to structural damage. Because experimental tests are expensive and risky, Finite Element Analysis (FEA) simulations are used. This study analyzes the effect of variations in methane gas flow rates on the strength of carbon steel strainers with plate thicknesses of 0.8 mm, 1 mm, and 2 mm. The tested velocities were 7.59 m/s, 9.59 m/s, and 11.59 m/s at a pressure of 10 bars and a temperature of 55?. The results showed the highest stress at the base of the strainer: 32,826 N/m2 (0.8 mm), 30,472 N/m2 (1 mm), and 21,975 N/m2 (2 mm). The maximum deformations occurred at the strainer tip: 2.35×10-8 m, 2.91×10-8 m, and 2.82×10-8 m. All values are below the yield strength limit of carbon steel (2.5×108–5×108 N/m2), indicating a safe design against high flow loads.
Investigating the Influence of Time Variation on Electric Motor Vibration Characteristics Rinaldi, Rinaldi; Weriono, Weriono; Hendri, Hendri
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 69 No 2 (2025): 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.v69i2.537

Abstract

This research aims to analyze vibrations in a 1750 HP Westinghouse electric motor. The electric motors have an important role in the company's operations. Hence, the vibration analysis may crucial to carried out for optimal performance and prevent potential damage. In this research is to find out the vibrations that occur according to the permitted vibration standards and to find out the parts of the machine that have an influence in order to minimize the vibrations that occur. Vibration test was carried out using the vibration analyzer as a measuring instrument and temperature testing. The results of the vibration analysis was obtained the vibration values ??on the Drive-End and Non-Drive End sides were still moderate and suitable for operation. The highest vibration value occurred in the first 10-minute test in the Non-Drive End (NDE) vertical direction with an rms value of 0.083 inch/s.
Mechanical Properties Restoration of API 5L X60 Carbon Steel through Hot Induction Bending Followed by Quenching and Tempering Treatment Kirana, Dois Dita Wahyu; Hasibuan, Fardin; Hakim, Arif Rahman; Adlinizar, Muhammad Fahrell
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 69 No 2 (2025): 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.v69i2.536

Abstract

Pipe bending is a critical process in the oil and gas industry to accommodate complex terrain while maintaining pipeline integrity. This study investigates the mechanical and micro structural responses of API 5L X60 seamless carbon steel pipes subjected to hot induction bending followed by quenching and tempering. Tensile testing, hardness measurements, and optical microscopy were employed to characterize the changes induced by these treatments. Post-treatment results demonstrated an increase in ultimate tensile strength from 580 N/mm² to 606 N/mm² (4.4%) and yield strength from 455 N/mm² to 495 N/mm² (8.7%), accompanied by a reduction in elongation from 27% to 23% and a slight decrease in hardness from 206 HV to 199 HV. Micro structural observations revealed finer grains (ASTM grain size 9.5) and the presence of tempered martensite, contributing to improved strength and toughness. The enhancements are attributed to strain hardening, phase transformation, and stress relief during tempering. These findings suggest that integrating hot bending with appropriate heat treatment effectively optimizes pipe performance for demanding service conditions.
Evaluation of Solar Energy Potential in Bojakan Village, Mentawai Islands Using PVGIS Simulation Ikhsan, Alfikri
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 69 No 2 (2025): 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.v69i2.544

Abstract

Electricity access remains highly uneven in Indonesia, especially in remote and underserved island regions such as the Mentawai Islands in West Sumatra. Bojakan Village, located in North Siberut District, is one of several communities still lacking electricity from the national utility grid (PLN). In response to this challenge, this study explores the technical feasibility of deploying solar photovoltaic (PV) systems as a renewable energy solution. Using hourly simulation data for a standard 1 kWp PV system from the Photovoltaic Geographical Information System (PVGIS), developed by the Joint Research Centre (JRC), energy production was analyzed over a three-year period (2021–2023). The data were processed in MATLAB to assess daily output, seasonal fluctuations, and average performance. Findings show that the PV system produces an average of 3.64 kWh/day. To meet the village’s projected electricity demand by 2031, a system with a capacity of approximately 49.7 kWp would be required, occupying a ground area of around 1,093.4 m². The results indicate that Bojakan holds sufficient solar potential for a sustainable off-grid energy system, subject to further technical and socio-economic considerations.
Development of a Python-Based Decision Support System for Evaluating Biomass Price Feasibility in Co-Firing Applications: Evidence from Riau, Indonesia Ramadhan, Aulia; Susilawati, Anita; Nazaruddin, Nazaruddin
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 69 No 2 (2025): 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.v69i2.542

Abstract

The utilization of biomass as a co-firing fuel in coal-fired power plants is a strategic element in Indonesia’s energy transition. A key challenge lies in accurately assessing the price feasibility of biomass fuel (B3m) and ensuring policy compliance. This study presents a Python-based Decision Support System (DSS) equipped with a graphical user interface (GUI) to compute and evaluate the Highest Benchmark Price (HPT) of B3m adaptively, including a maximum price coefficient (k =1.2). The system was tested using 12 actual proposals from B3m suppliers in Riau Province. Results indicate that 58.3% of offers complied with regulatory thresholds, with wood-based B3m proving generally more competitive than palm-based feedstocks. The system enables automated and transparent price feasibility classification. These findings highlight the potential of localized Python-based computational tools to support economic evaluation of renewable energy deployment.
Impact of Tropical Environmental Conditions on Mechanical Cooling Tower Performance: A Case Study at PT. XYZ Prasetyo, Eko Andi; Rhakasywi, Damora; Fahrudin, Fahrudin
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 69 No 2 (2025): 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.v69i2.540

Abstract

Indonesia's tropical climate, characterized by high ambient temperatures, intense humidity, and frequent rainfall, presents significant challenges for industrial cooling systems. This research investigates how tropical climate conditions influence the operational performance of a mechanical cooling tower installed at PT. XYZ, located in Cileungsi, West Java, Indonesia. The research offers valuable insights into energy optimization and operational planning under varying weather scenarios. Data collection involved real-time measurements under nine combinations of weather and time conditions (sunny, cloudy, rainy; morning, noon, afternoon), using thermocouples, hygrometers, and an ESP32 microcontroller. Key variables observed include ambient temperature, incoming water temperature, outgoing water temperature, relative humidity, and wet bulb temperature. Multiple linear regression was employed for analysis, supported by correlation analysis, t-tests, and F-tests. The model achieved a high determination coefficient (R²) of 80%, indicating strong predictive accuracy. Partial R² analysis revealed that the outgoing water temperature contributed 77% to the variation in cooling tower efficiency, followed by ambient temperature at 65%, incoming water temperature at 54%, and relative humidity at 36%. The highest efficiency, 67%, was recorded during sunny mornings, while the lowest, 42%, occurred at rainy noon. These findings confirm that tropical environmental factors have a significant and quantifiable impact on cooling tower performance. The results are expected to support the development of adaptive and efficient energy strategies in tropical industrial contexts.
Advancing Casing Head Design on Wellhead Equipment Under Hydrostatic Pressure Using Finite Element Analysis Putra, Deny Jaya; Hasibuan, Fardin; Liston, Sony; Hafiz, Abdul
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 69 No 2 (2025): 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.v69i2.535

Abstract

Ensuring the structural integrity of casing heads under high-pressure conditions is crucial in oil and gas well safety. This study applies Finite Element Analysis (FEA) using Solid-Works 2024 to evaluate a 13-5/8 5K × 13-3/8 5K casing head design under hydrostatic pressure up to 7,500 psi, following API 6A standards. Unlike conventional designs that rely on a single material, this research compares AISI 4130 alloy steel and Stainless Steel 410 to assess their structural performance and interchangeability. The simulation analyzed stress distribution and deformation, revealing both materials stayed well within safe limits, with a maximum Von Mises stress of 18,196 psi and deformation of 0.00006112 inch. The results demonstrate that material substitution is structurally viable, offering a cost-effective and supply-chain-resilient solution. The novelty lies in validating design adequacy through simulation of the weaker material, confirming its suitability for both. This method enhances design flexibility and material selection strategies for pressure-containing components.
Sea Level Anomaly Variability Due to Global Climate in the Western Waters of Sumatra Banjarnahor, Samuel Kristian Alfredo; Silaban, Angeli; Verojenases, Fascal; Irkhos, Irkhos; Lizalidiawati, Lizalidiawati
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 69 No 2 (2025): 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.v69i2.534

Abstract

The western waters of Sumatra are part of the Indonesian waters that directly interact with the Indian Ocean, which is a climatologically complex area due to influenced by various atmospheric and marine phenomena that are seasonal and inter annual. Therefore, the purpose of this study is to analyze the influence of the El Niño Southern Oscillation (ENSO) phenomenon on changes in sea level in Western Sumatra waters during the period of 1997-2023. The data used include sea level anomaly (SLA), Oceanic Niño Index (ONI), and Dipole Mode Index (DMI). The results show that strong El Niño, such as in 1997/1998, cause sea level to drop to - 0.3 meters due to intense upwelling. In contrast, El Niño 2015/2016 increased sea level by + 0.2 meters due to the dominance of down welling. During the La Niña period, sea level rose significantly, reaching 0.3 meters in 2022/23. The long-term trend shows an average sea level rise of 0.056-0.064 meters over the last 26 years, with different variations between regions.

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