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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 211 Documents
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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°.
Characteristics of Profile Pin Variation in HDPE Friction Stir Welding to Mechanical Properties of Materials Agus Wahyu Setiawan; Budi Darsono, Febri; Kriswanto; Ramadhani, Riski
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.v9i2.15638

Abstract

Friction Stir Welding (FSW) is one of the Solid-State Welding processes, which joins materials below their melting point by continuously rubbing two workpieces together to generate heat. The FSW process heavily relies on the use of pin profiles, which play a crucial role in forming the weld joint, as they directly affect material flow in the weld zone and heat distribution during the welding process. This research aims to evaluate the mechanical properties of FSW joints made using different pin profile variations, in order to achieve high-quality welds. The study applies a descriptive statistical analysis approach, utilizing tensile testing, flexural testing, hardness testing, and macro photography. The material used in this research is High-Density Polyethylene (HDPE), with three types of pin profiles: triangular, threaded cylindrical, and grooved cylindrical. The welding parameters are kept constant: feed rate of 25 mm/min, spindle speed of 930 RPM, plunge depth of 3.84 mm, and tilt angle of 0°. The results show that the threaded pin profile produced the highest average values: hardness of 59.5 SHD, tensile strength of 11.5 MPa, and flexural strength of 22.4 MPa. In contrast, the grooved pin profile showed the lowest average values: hardness of 57.83 SHD, tensile strength of 4.99 MPa, and flexural strength of 4.22 MPa. The mechanical strength test results were influenced by weld defects observed through macro images. These weld defects significantly impacted the mechanical properties and demonstrated that pin profile geometry plays a vital role in heat generation through friction and in controlling the material flow dynamics, which directly determine the structural integrity and mechanical performance of the weld joint.
Exergy Analysis in the Application of Exhaust Heat Utilization Through Diesel Engine Cooling Unit for Organic Rankine Cycle Burhan Hafid; Ibnu Hajar; Reinaldi Teguh Setyawan
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.v9i2.15647

Abstract

A Very rapid population growth has resulted in fossil energy being gradually depleted and environmental pollution getting worse. So far, burning fossil fuels has produced about 40% of global carbon dioxide (CO2) emissions, which are considered a major source of greenhouse gases. The Internal Combustion Engine (ICE) has become the main power source for cars, trucks, locomotives, and ships. In ordinary diesel engines, less than 45% of the fuel energy can be converted into useful work output from the crankshaft, and the remaining energy is largely lost through exhaust gases and jacket water. One way that can be done is to utilize the waste from the internal combustion engine (ICE). This method uses the Organic Rankine Cycle (ORC) system by utilizing the wasted heat generated by the Diesel engine when operating, through the engine coolant coming out of the engine gap (water jacket) to the radiator. In this study, the study focused on the exergy analysis of each component in the ORC system integrated in the diesel engine cooling unit which was simulated using Aspen Plus software. The analytical method used in this study is the exergy method with variations in ambient temperature of 20oC, 21oC, 22oC, 23oC, 24oC, 25oC, 26oC, 27 oC, and 28 oC using the working fluid R141B. The results showed that the greatest exergy destruction was found in the components of the pump, evaporator, and turbine.
Compressive Strength Characteristics of Mortar Composite Materials Influenced by the Fly Ash Mass Composition Ratio Muhammad Yusuf Rahmansyah Siahaan; Siregar, Rakhmad Arief; Faisal Amri Tanjung; Muhammad Nuh Hudawi Pasaribu
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.v9i2.15685

Abstract

The application of science and technology to mortar composite materials creates increasingly better economic value advantages and its development potential has a positive impact on the field of building construction with the implementation of household appliances, coral transplant media, sea walls, roads, curbs, paving blocks, reclaimed land, plant vases, wall ornaments, and acoustic panels. Fly ash material as industrial waste has been categorized as non-B3 waste by the government so that the use of Fly Ash can be optimized to maintain environmental sustainability and become a catalyst for driving the community's economy. This study with a 1: 2 ratio mortar material added with fly ash material to analyze the mechanical properties of the material using experimental testing methods on 3 variations of fly ash material compositions in sequence 10%, 30%, and 50% aims to obtain compressive strength characteristics and mass percentage. The test results provide the highest compressive strength value data on 10% fly ash material of 28.10 MPa while other composition variations tend to show a decrease in the ability of material resilience properties in sequence of 9.36% and 20.32%. The mechanical properties of compressive strength meet the quality requirements of SNI 03-0691-1996 for implementation on paving blocks of type B quality and SNI 2442-2020 for application on concrete curbs. The influence of mass composition provides a positive contribution creating an increasing trend towards the mass percentage where the response of fly ash variations is respectively 20.74% and 14.33%.
Strength Analysis of S275 JOH Material Using Charpy Impact Test Equipment M. Tri Maulady Alamsyah; Wilarso
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.v9i2.16077

Abstract

S275 JOH is a structural steel widely used in the construction of bridges, buildings, and other infrastructure. This study aims to evaluate the material's impact strength through Charpy impact testing on two types of specimens: SHS (Square Hollow Section) and RHS (Rectangular Hollow Section). Testing was conducted at 10°C according to the EN 10210-1 standard. The results show that the 75x75 mm SHS has an average impact energy value of 105.90 J, higher than the 100x200 mm RHS with a value of 78.79 J. Despite a decrease of approximately 25% in RHS, both specimens still meet the minimum requirement of 27 J according to the standard. This study provides a scientific basis for selecting structural steel materials based on impact strength.

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