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INDONESIA
JOURNAL OF MECHANICAL ENGINEERING, MANUFACTURES, MATERIALS AND ENERGY
Published by Universitas Medan Area
ISSN : 25496220     EISSN : 25496239     DOI : -
Core Subject : Science, Engineering,
Energy Industrial & Manufacturing Engineering Mechanical Engineering
This journal is a publication media of research results in the field of machinery that has been carried out by academics or practitioners by following predetermined rules. The research areas include: manufacturing, engineering materials, energy conversion and renewable energy, as well as other machinery fields, such as: mechatronics, hydraulics, plantation tools, and engine maintenance management systems. Each paper that has been sent will be reviewed by a team of experts in their field, and published online through the http://ojs.uma.ac.id/index.php/jmemme url address. This journal was founded in 2017 and has been registered with a print version of ISSN 2549-6220 and the online version of ISSN 2549-6239.
Arjuna Subject : -
Articles 15 Documents
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Search results for , issue "Vol. 9 No. 2 (2025): December 2025 Edition" : 15 Documents clear
Sustainable Biodiesel Industry: A Techno-Economic Framework For Evaluating Biodiesel Production Uhanto; Muhammad Syukri Nur
JOURNAL OF MECHANICAL ENGINEERING MANUFACTURES MATERIALS AND ENERGY Vol. 9 No. 2 (2025): December 2025 Edition
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31289/jmemme.v9i2.14134

Abstract

This study evaluates the technical and economic aspects of the biodiesel industry, focusing on factors affecting production feasibility and industry sustainability. Secondary data for the analysis were sourced from published and Scopus-indexed research. The study identifies biodiesel characteristics, production processes, techno-economic aspects, and the biodiesel market. The analysis indicates that biodiesel has significant potential as an alternative to fossil fuels. It shares comparable energy density and cetane numbers with fossil diesel while providing superior lubrication properties and lower CO₂ emissions. Biodiesel transesterification achieves high efficiency with alkaline catalysts and feedstocks with low free fatty acid content, resulting in higher biodiesel yields. From an economic perspective, feedstock costs constitute 75–80% of the total biodiesel production cost, posing a major challenge due to the high price volatility of feedstocks in the market. Supportive policies for utilizing local and non-food feedstocks are necessary to reduce dependence on similar and relatively expensive raw materials. The financial sustainability of biodiesel production depends on production process efficiency and feedstock price stability. Economic feasibility is measured using indicators such as Net Present Value (NPV) and Internal Rate of Return (IRR). This knowledge provides valuable insights for developing more effective strategies in the biodiesel industry, supported by targeted policies that enhance both economic and environmental viability.
Bioenergy as a Key Driver of Energy Transition: A Case Study of Emission Reduction and Energy Security Saiful, Rifki; Nur, Syukri M
JOURNAL OF MECHANICAL ENGINEERING MANUFACTURES MATERIALS AND ENERGY Vol. 9 No. 2 (2025): December 2025 Edition
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31289/jmemme.v9i2.14158

Abstract

The transition to renewable energy is an urgent step in addressing the global climate crisis and reducing dependence on fossil fuels, which have increased greenhouse gas emissions and exacerbated climate change. In this context, bioenergy emerges as an important solution because it not only helps reduce carbon emissions through cleaner and carbon-neutral combustion but also increases energy security by diversifying energy sources, especially through the utilization of organic biomass such as agricultural and forestry waste. This study aims to study more deeply about bioenergy as a key driver of energy transition through case studies related to emission reduction and energy security enhancement. Bioenergy plays an important role in the global energy transition because it is able to reduce dependence on fossil fuels and reduce carbon emissions. In addition to helping create a more resilient energy system by utilizing local biomass resources, bioenergy also supports the principle of a circular economy through the utilization of organic waste. Despite offering many benefits, bioenergy development faces challenges such as resource supply and production efficiency, but the opportunities to overcome these challenges remain large through technological innovation and supportive policies. Bioenergy plays an important role in the global energy transition towards clean energy by reducing carbon emissions and increasing energy security through the utilization of renewable biomass. Despite challenges in terms of policy, technology, and raw material supply, the great potential of bioenergy can be optimized through innovation and policy support to strengthen a more sustainable energy system. This study shows that bioenergy has great potential to reduce carbon emissions and increase energy security through the use of renewable biomass, but further development is needed to overcome efficiency and policy challenges to support the transition to a more sustainable energy system.
Evaluation of Occupational Safety and Health Requirements in Confined Space at Turbine Maintenance PT. Sinergi Nusantara Gula PG Tjoekir Lilis Hindun Wahyuni; Merry Sunaryo; Muslikha Nourma Rhomadhoni; Friska Ayu
JOURNAL OF MECHANICAL ENGINEERING MANUFACTURES MATERIALS AND ENERGY Vol. 9 No. 2 (2025): December 2025 Edition
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31289/jmemme.v9i2.14281

Abstract

Confined space is a high-risk workplace because it contains various sources of danger such as toxic gases, lack of oxygen, and fire risk. PT. Sinergi Gula Nusantara PG Tjoekir has implemented work procedures based on BINWASNAKER No. 113/DJPPK/XI/2006, but evaluation is needed to ensure compliance with the latest regulations, namely Permenaker No. 11 of 2023. The study aimed to evaluate the OSH Requirements in confined space turbine maintenance at PT. SGN PG Tjoekir is by Permenaker no. 11 of 2023, including confined space classification, access restrictions to enter confined spaces, entry permits, safe work procedures, equipment and equipment, and OSH confined space personnel. The type of research method used is qualitative descriptive, namely providing an overview of OSH requirements in a limited space for turbine maintenance. Then the data obtained is compared to its conformity with Permenaker No. 11 of 2023. The results of this study out of 17 conditions that must be met only 60% that have been met. The conditions that have not been met are the classification of confined space, testing and monitoring of hazardous atmospheric gases, labeling and energy isolation forms, supply respirators, testing, and monitoring equipment for hazardous atmospheric gases, penetrating voltage measuring instruments, and OSH confined space personnel. This study concludes that the OSH requirements in confined space turbine maintenance are in the category of lacking. The advice provided by the company can update the entry permit procedure and increase compliance with the latest regulation, namely Permenaker No. 11 of 2023 to improve work safety.
Analysis of the Effect of Biodiesel Use on the Wear of Heavy Equipment Machinery Components in the Mining Industry Gede Arya Rachman; Syukri M. Nur
JOURNAL OF MECHANICAL ENGINEERING MANUFACTURES MATERIALS AND ENERGY Vol. 9 No. 2 (2025): December 2025 Edition
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31289/jmemme.v9i2.14577

Abstract

This study analyzes the effect of the use of B30/B35 biodiesel on the wear of heavy equipment engine components in the Indonesian mining industry. Through a longitudinal experimental design for 12 months, the study was conducted on 24 units of heavy equipment consisting of excavators, bulldozers, and articulated dump trucks in three different mining locations: a coal mine in East Kalimantan, a nickel mine in Southeast Sulawesi, and a gold mine in Papua. The results show that the use of B30/B35 biodiesel consistently reduces the wear rate of components compared to conventional diesel. Nozzle injector wear in the biodiesel group is 18.6% lower, piston ring wear is 15.3% lower, cylinder liner wear is 12.7% lower, and bearing wear is 14.2% lower. SEM and EDS analysis revealed that biodiesel forms a tribochemical layer on metal surfaces that reduces direct contact between surfaces and minimizes wear. The analysis of the lubricant showed lower concentration of metal particles and better lubricant quality parameters in the biodiesel group. The developed predictive model indicates an extension of component life of around 15-20% with the use of biodiesel, potentially providing maintenance cost savings of 12-18% per year. These findings change the perception that the use of biodiesel is solely regulatory compliance, to an operational strategy that provides economic and technical benefits. This study provides a scientific basis for the optimization of preventive maintenance programs for mining heavy equipment that uses biodiesel and supports the sustainability of the implementation of the national mandatory biodiesel policy.
Experimental Study on the Effect of a Cooling System on an Unmanned Surface Vehicle Prototype Using a Zenoah G32FC Engine Asral; Hanifa, Fadjriya
JOURNAL OF MECHANICAL ENGINEERING MANUFACTURES MATERIALS AND ENERGY Vol. 9 No. 2 (2025): December 2025 Edition
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31289/jmemme.v9i2.14997

Abstract

This study presents a performance test of the cooling system on an unmanned vessel prototype using a Zenoah G32FC engine. The purpose of this research is to evaluate the impact of the cooling system on engine temperature, radiator effectiveness, and vessel speed. The experiment was conducted using a platform supply vessel (PSV) prototype with a monohull design, measuring 120 cm in length and 35.15 cm in width. The Zenoah G32FC engine is a 2-stroke engine with a displacement of 31.8 cc, serving as the main propulsion unit for the prototype. Two types of coolant fluids were tested: water and radiator coolant. The results showed that the use of a radiator helped maintain engine temperature more effectively compared to operating without one, with an average test temperature of 64.3°C and a peak temperature of 71.6°C. The radiator coolant achieved the highest effectiveness, reaching 57.6%, with a heat transfer rate of 341 watts. Vessel speed remained relatively constant throughout all tests, indicating that the use of a radiator had minimal impact on speed, while still maintaining engine temperature within a safe range. Therefore, the use of a radiator is strongly recommended to optimize engine performance.
Design and Construction of Electric Car Chassis for KMLI Competition Needs Using Solidwork Rifki Dwi Putranto; Zenkey Soma Mahendra; Rahaditya Dimas Prihadianto
JOURNAL OF MECHANICAL ENGINEERING MANUFACTURES MATERIALS AND ENERGY Vol. 9 No. 2 (2025): December 2025 Edition
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31289/jmemme.v9i2.15176

Abstract

The purpose of this study is to obtain a lightweight electric car frame design, providing a sense of security and comfort with the intention of being the basis for the placement of the steering, engine, battery, vehicle body, and other components for the needs of the Indonesian Electric Car Competition. This study was conducted using the Research Development method with the help of software that is capable of making a model in the form of a 3-dimensional image, in this case the software used is Solidwork software. Based on the results of the study, it can be concluded that: (1) Chassis design using Solidwork software with the design of KMLI competition needs before implementation (2) Car frame design with a 2000 watt BLDC motor specification with a 1/2 inch Black Iron Pipe frame material. (3) Analysis of the frame height when receiving a load of 100 kg is 16.5 cm with a chain ratio of 1500 rpm
Study of Wind Energy Potential for Wind Power Plants Development in the South Coastal Area of Malang Regency Yahya Darmawan
JOURNAL OF MECHANICAL ENGINEERING MANUFACTURES MATERIALS AND ENERGY Vol. 9 No. 2 (2025): December 2025 Edition
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31289/jmemme.v9i2.15344

Abstract

One of the renewable energy sources that has the potential to be developed in Indonesia is wind energy sources, Indonesia has wind energy sources that can be converted to produce up to 60.68 GW of electricity. One of the potential areas to be developed is the southern region of Java Island and wind speed analysis using the wind weilbull approach. wind speed data is taken from Nasa Power satellite data with a wind height of 50 meters with a time span of January 1, 2022 to December 31, 2022. From the calculation of wind speed, it is found that in the coastal area of South Malang the average speed is 4.92 m/s, with the highest speed of 11.18 m/s. From the analysis using the wind weilbull approach, it is found that the South Coast of Malang has a variation in wind speed between 1-12 m / s where the highest speed occurs in the wind speed range of 6 m / s occurs as much as 18.976%, and the occurrence in 1 year occurs for 1547 hours and the electrical energy produced in a year is 413,520,696 watts. By using q-blade simulation with a turbine diameter of 7.8 m, NACA 4412 airfoil type and TSR value of 5.5, the wind turbine capacity is 5.93661 kW with a CP value of 0.4392. Key words: Renewable energy, maximum average wind speed, electrical energy, wind turbine
Experimental Analysis of Cooling Fluid Temperature Effects on the Performance of a Thermoelectric Generator (TEG) Integrated with Heat Sink Hermawan, Indra; Lian Galed S.
JOURNAL OF MECHANICAL ENGINEERING MANUFACTURES MATERIALS AND ENERGY Vol. 9 No. 2 (2025): December 2025 Edition
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31289/jmemme.v9i2.15512

Abstract

This study aims to experimentally analyze the effect of coolant temperature on the performance of a Thermoelectric Generator (TEG) combined with a finned aluminum heatsink. The TEG operates based on the Seebeck effect, where a temperature difference between the hot and cold sides generates electrical energy. The experiment employed six SP-1848 TEG modules arranged in series and mounted on a heatsink partially immersed in static water as a cooling fluid. Measurements were taken every 300 seconds for a total of 3600 seconds, monitoring parameters such as hot side temperature (Th), coolant temperature (Tc), voltage, and current, as well as calculated power and efficiency. The results showed that the increasing exposure time to solar heat gradually raised Th, while Tc increased more slowly. The resulting temperature difference (ΔT) directly contributed to an increase in electrical power output of more than 0.005 W, and TEG efficiency exceeding 14%. This study highlights the importance of thermal management through heatsinks and coolant fluids in optimizing TEG performance, particularly in small-scale renewable energy applications.
Characteristics of SKD 61 and Aluminium 7075 Tools in High Density Polyethylene (HDPE) and Polypropylene (PP) Welding in Terms of Tensile Strength and Bending strength Alkafi, Abu Faqih; Darsono, Febri Budi; Kriswanto; Rochim, Mohammad Nur
JOURNAL OF MECHANICAL ENGINEERING MANUFACTURES MATERIALS AND ENERGY Vol. 9 No. 2 (2025): December 2025 Edition
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31289/jmemme.v9i2.15550

Abstract

Effective welding procedures are necessary to preserve structural integrity due to the growing usage of lightweight polymers in industry, such as polypropylene (PP) and high density polyethylene (HDPE). This study sought to determine how the tool materials, SKD 61 and Aluminum 7075, affected the tensile and bending strength of HDPE and PP friction stir welded (FSW) joints. A quantitative comparative design was used in the experiment, and the FSW tool was modified milling equipment with screw cylindrical pin tools. Temperature control was observed using a thermogun and no preheating was used to guarantee process stability. Based on the results, SKD 61 generated higher weld quality, which was characterized by fewer flaws, regulated heat input, and more consistent material flow. SKD 61 outperformed than aluminium 7075, which had an average tensile strength of 11.09 MPa and bending strength of 19.11 MPa, while aluminium 7075 had an average tensile strength of 7.8 MPa and bending strengths of 16.28 MPa. This discrepancy is explained by SKD 61's higher heat conductivity and stability, whereas tool geometry had little effect because the screw cylindrical pin profile was the same. SKD 61 is more suited for FSW of HDPE-PP dissimilar joints, according to the study's findings, offering higher joint quality and stronger mechanical performance.
Characteristics of Tool Tilt Variation in Friction Stir Welding HDPE with Tool Made of 7075 Aluminum on Tensile and Bending Strengths Nur Rochim, Mohammad; Darsono, Febri Budi; Kriswanto; Alkafi, Abu Faqih
JOURNAL OF MECHANICAL ENGINEERING MANUFACTURES MATERIALS AND ENERGY Vol. 9 No. 2 (2025): December 2025 Edition
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31289/jmemme.v9i2.15551

Abstract

High-Density Polyethylene's (HDPE) potential is highlighted by the growing need for lightweight, high-strength materials in the automotive and aerospace industries. Friction Stir Welding (FSW) provides a solid-state joining method with low thermal degradation for producing high-quality joints in this thermoplastic material. With an emphasis on tensile and bending strength, this study attempts to examine how tool tilt angle variation affects HDPE joint quality. Three different tilt angle variations—0°, 1°, and 1.5°—were used in the experiment, which was carried out using an aluminum 7075 tool that was shaped like a grooved conical pin. A modified milling machine was used for welding, and ASTM D638 for tensile and ASTM D790 for bending mechanical tests were conducted. The findings show that the tilt angle has a major impact on the quality of the weld. With a tensile strength of 13 MPa (68.4% of raw HDPE), a bending strength of 16.5 MPa (70.5%), and a dense stir zone with few voids, the best weld was produced at a 1.5° angle. On the other hand, the weakest joint with obvious structural flaws was produced by the 0° angle. Overall, it is determined that the best tilt angle for improving the mechanical and aesthetic performance of FSW joints in HDPE is 1.5°.

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