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R.E.M (Rekyasa Energi Manufaktur) Jurnal
Published by Universitas Muhammadiyah Sidoarjo
ISSN : 25275674     EISSN : 25283723     DOI : https://doi.org/10.21070/r.e.m
Core Subject : Engineering,
Engineering
Focus and Scope Aim: to facilitate scholar, researchers, and teachers for publishing the original articles of review articles. Scope: Mechanical Engineering include: Energy Conversion Renewable Energy Manufacturing Materials and Design Engineering Mechatronics
Arjuna Subject : Teknik (semua kategori) - Teknik Mesin
Articles 155 Documents
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Analysis of the Effect of Wind Speed ​​on the Formation of Porosity Defects in GTAW Welding with Grade A Plate Material and ER70S-G Electrodes: Analisis Pengaruh Kecepatan Angin terhadap Pembentukan Cacat Porosity pada Pengelasan GTAW dengan Material Pelat Grade A dan Elektroda ER70S-G Davin Aditiawan; Imanuel Adam Tnunay
R.E.M. (Rekayasa Energi Manufaktur) Jurnal Vol 10 No 1 (2025): June
Publisher : Universitas Muhammadiyah Sidoarjo

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Porosity merupakan salah satu cacat las yang dapat mempengaruhi kualitas dan kekuatan hasil pengelasan. Salah satu faktor eksternal yang berkontribusi terhadap munculnya porosity adalah kecepatan angin selama proses pengelasan. Penelitian ini bertujuan untuk menganalisis pengaruh variasi kecepatan angin terhadap pembentukan cacat porosity pada hasil pengelasan GTAW (Gas Tungsten Arc Welding) menggunakan material pelat baja grade A dan elektroda ER70S-G. Eksperimen dilakukan dengan memvariasikan kecepatan angin pada nilai 0 m/s, 2 m/s, 4 m/s, dan 6 m/s menggunakan kipas angin industri yang diatur pada jarak 1 meter dari titik pengelasan. Spesimen uji berupa pelat baja grade A ketebalan 10 mm disambung menggunakan metode pengelasan GTAW dengan parameter arus 160 A, voltase 20 V, dan kecepatan pengelasan 2 mm/s. Pengamatan cacat porosity dilakukan melalui pengujian radiografi. Hasil penelitian menunjukkan bahwa peningkatan kecepatan angin berbanding lurus dengan jumlah dan ukuran porosity yang terbentuk. Pada kecepatan angin 0 m/s, tidak ditemukan cacat porosity yang signifikan. Seiring peningkatan kecepatan angin, jumlah porosity meningkat secara signifikan, dengan cacat terbanyak ditemukan pada kecepatan 6 m/s dengan rata-rata diameter porosity mencapai 2,5 mm. Analisis statistik menunjukkan korelasi positif kuat (R2 = 0,92) antara kecepatan angin dan pembentukan porosity. Penelitian ini menyimpulkan bahwa kecepatan angin memiliki pengaruh signifikan terhadap kualitas hasil pengelasan GTAW, dengan batas kecepatan angin maksimal yang direkomendasikan adalah 2 m/s untuk meminimalkan pembentukan cacat porosity.
Development of Rooftop Solar Power Plant (PLTS) on Parking Areas for EV Charging Station at Sumsel-8 Mine Mouth Power Plant Rendy Anggara, Gusti; Silviana; Yoyo Wardana, Asep
R.E.M. (Rekayasa Energi Manufaktur) Jurnal Vol 10 No 1 (2025): June
Publisher : Universitas Muhammadiyah Sidoarjo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21070/r.e.m.v10i1.1755

Abstract

The PLTU MT Sumsel-8, a coal-based power plant, has significant potential to implement renewable energy solutions to enhance energy efficiency and operational sustainability. One viable solution is the construction of a rooftop solar power plant (PLTS) in the parking area with an off-grid system. This system is designed with a capacity of 162 kWp to meet the electricity needs of supporting facilities at the power plant, such as lighting, cooling systems, and office operations. In addition to generating clean energy, the installation of solar panels on the parking lot roof also provides additional benefits, including vehicle protection from solar heat and the optimization of previously underutilized land. However, before implementing this system, a comprehensive feasibility study is required, encompassing technical, economic, and environmental evaluations. Simulation results using Helioscope software indicate that the proposed PLTS system with the stated capacity can generate 225.413,2 kWh of energy per year. Considering the energy storage capacity of electric vehicles, the simulation results suggest that the energy production can provide enough charging capacity for 7 to 8 vehicles per day for vehicles with battery capacity 77 to 82,5 kWh and up to 23 vehicles per day for smaller capacity battery which is 26,7 kWh. This study is expected to offer recommendations for the implementation of rooftop PLTS at PLTU and contribute to the strategy for sustainable energy options in Indonesia.
The Effect of Time Variation and Number of Fiberglass Layers in the Composite Material Manufacturing Process on Tensile Strength, Bending and Surface Flatness: Pengaruh Variasi Waktu dan Jumlah Lapisan Fiberglass dalam Proses Pembuatan Material Komposit Terhadap Kekuatan Tarik, Tekuk dan Kerataan Permukaan Mulyadi, Mulyadi; Dimas Sunu Purwohadi; Iswanto
R.E.M. (Rekayasa Energi Manufaktur) Jurnal Vol 10 No 1 (2025): June
Publisher : Universitas Muhammadiyah Sidoarjo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21070/r.e.m.v10i1.1760

Abstract

This research explores the production of fiberglass composite materials using an open mold process with pressing, aiming to overcome the uneven surfaces often produced by the hand lay-up method. Conducted in the Mechanical Engineering laboratories of Universitas Muhammadiyah Sidoarjo (UMSIDA) and Politeknik Negeri Malang, the study tested specimens using tensile testing (ASTM D638 Type I) and flexural testing (ASTM D790), along with surface flatness measurement via a dial indicator. The research varied the number of fiberglass layers (2, 3, and 4) and the pressing duration (3, 4, and 5 hours). Tensile tests showed the best stress and strain with 2 layers of fiberglass and 3 hours of pressing, with the "hours" factor contributing 55.28% to true stress and 45.23% to true strain. Flexural tests indicated the best stress and modulus of elasticity with 4 layers of fiberglass and 4 hours of pressing, with the "hours" factor contributing 31.48% to the modulus of elasticity. Optimal surface flatness was achieved with 3 layers of fiberglass and 4 hours of pressing, with the "hours" factor contributing 38.77%. Optimizing process parameters is essential for improving the quality of molded products and provides a foundation for developing a more efficient pressing method in future composite material production
Theoretical Study on the Composite Floor Made of a Steel Space Frame and Concrete Slab Najim, Nada Abdulkareem; Saleh, Ihab Sabri; Dakhil, Ammar Jasim
R.E.M. (Rekayasa Energi Manufaktur) Jurnal Vol 10 No 2 (2025): December
Publisher : Universitas Muhammadiyah Sidoarjo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21070/r.e.m.v10i2.1766

Abstract

This study investigates the structural behavior of composite roof systems consisting of a double-layer space frame topped with a concrete slab. The analysis focuses on the influence of joint spacing, connection types (fixed vs. bolted), and the addition of a concrete slab on the overall system performance. Twelve structural models were developed using ETABS (CSI) software, with an equal distribution between slab-incorporated and slab-free configurations. After performing numerical simulations, key parameters, including element cross-sectional areas, vertical deflections, and maximum displacements, were evaluated according to ACI 318 reinforced concrete and AISC steel design standards. The results indicate that incorporating a concrete slab into a space-frame system significantly reduces the maximum vertical deflection and allows for more efficient element sizing, especially in the top chord elements. Furthermore, models with fixed supports demonstrated greater overall stiffness and stability compared to models with pinned connections. The results confirm the critical role of slab integrity and joint stiffness in enhancing structural efficiency, improving material utilization, and ensuring compliance with contemporary design standards.
Experimental Study of Bifacial Solar Panels with Reflective Surface Variations in Bandung, Indonesia Barokah, Rofi; Nia Nuraeni Suryaman; Ahmad Rajani
R.E.M. (Rekayasa Energi Manufaktur) Jurnal Vol 10 No 2 (2025): December
Publisher : Universitas Muhammadiyah Sidoarjo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21070/r.e.m.v10i2.1758

Abstract

This study aims to evaluate the performance of bifacial photovoltaic (PV) panels under different reflective surface conditions in a tropical urban environment, specifically in Bandung, Indonesia. Bifacial PV systems offer the advantage of capturing solar radiation from both the front and rear sides, with performance significantly influenced by the surface beneath the panels. The experiment involved three surface types: asphalt, untreated paving blocks, and paving blocks coated with white paint. Each panel was installed at a fixed 8° tilt facing north, and data were collected from 09:00 to 15:00 local time. The results indicate that the white-painted surface produced the highest power output, reaching up to 410 Watts, followed by paving blocks at 390 Watts and asphalt at 370 Watts. Although all surfaces received a similar radiation pattern, their differing reflectivity affected the amount of radiation reaching the rear side of the bifacial panels. The white-painted surface, characterized by high reflectance, not only enhanced rear-side radiation capture but also maintained a more stable power output after peak solar hours. These findings highlight the critical role of surface reflectivity in optimizing bifacial PV performance and support the strategic use of surface materials in PV system deployment, particularly in tropical climates. This study contributes valuable empirical data to the growing field of bifacial PV applications and offers practical insights for improving energy yield in real-world tropical settings.
Analysis of the Effect of CVT Spring Variation on the Performance of Beat Deluxe Motorcycles Maulana, Aceng Anrul; Martoni
R.E.M. (Rekayasa Energi Manufaktur) Jurnal Vol 10 No 2 (2025): December
Publisher : Universitas Muhammadiyah Sidoarjo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21070/r.e.m.v10i2.1759

Abstract

Automatic motorcycles are popular due to their efficiency and flexibility in urban areas. CVT spring modifications are often done to improve performance. This research tested the effect of 1000 RPM (standard), 1500 RPM, and 2000 RPM CVT springs on a Beat Deluxe using a dynotest, observing torque, power, fuel consumption, CVT wear, and engine temperature on 68 kg and 134 kg riders. The results showed that at 3000 RPM, the highest torque was achieved by the 2000 RPM spring (14.04 Nm for 68 kg, 12.84 Nm for 134 kg). The highest power at 4000 RPM was also by the 2000 RPM spring (6.6 HP for 68 kg, 5.9 HP for 134 kg) but with the highest fuel consumption (0.021 l/km for 68 kg, 0.030 l/km for 134 kg). The 1500 RPM spring showed a moderate performance increase with wear and temperature between the 1000 RPM and 2000 RPM springs. The 1000 RPM spring produced the lowest temperature (76.5 ℃), followed by 1500 RPM (79.7 ℃) and 2000 RPM (84.1 ℃), indicating a correlation between spring stiffness and operating temperature.
The Use of R290 As a Replacement For R404A in Block Ice Machines Febiadisti, Vigasta; Nia Nuraeni Suryaman; Arifin Santosa; Aep Saepudin; Andri Setiawan
R.E.M. (Rekayasa Energi Manufaktur) Jurnal Vol 10 No 2 (2025): December
Publisher : Universitas Muhammadiyah Sidoarjo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21070/r.e.m.v10i2.1763

Abstract

This study evaluates the performance of R290 refrigerant as an alternative to R404A in block ice-making machines based on vapor compression cycles. The method used is a quantitative experimental approach with direct testing of compressor power, condenser power, evaporator power, and coefficient of performance (COP) parameters. Test results indicate that R290 has lower power consumption and a higher COP compared to R404A, with a COP of 3.22 (R290) versus 2.48 (R404A). Additionally, R290 has a significantly lower global warming potential (GWP), making it more environmentally friendly. The more stable and efficient thermodynamic performance of R290 supports its effectiveness as an economical and sustainable alternative refrigerant for modern cooling applications.
Design and Manufacturing of the Steering System in the KMHE Laksamana V 1.0 Prototype Vehicle Istana, Budi; Aydil Hijerah Harahap; Sunaryo
R.E.M. (Rekayasa Energi Manufaktur) Jurnal Vol 10 No 2 (2025): December
Publisher : Universitas Muhammadiyah Sidoarjo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21070/r.e.m.v10i2.1771

Abstract

The Energy Efficient Car Contest (Kontes Mobil Hemat Energi or KMHE) is a national competition in Indonesia that challenges university students to develop ultra-efficient prototype vehicles. This study presents the design, simulation, and manufacturing of a custom steering system for the Laksamana V 1.0 single-passenger prototype vehicle developed by Team Laksamana. The steering system was engineered to meet strict requirements for weight, structural reliability, ergonomic fit, and maneuverability under competition conditions. A rack-and-pinion mechanism was selected after comparative evaluation of multiple steering concepts. Computer-Aided Design (CAD) and Finite Element Analysis (FEA) were employed to optimize the geometry and assess the mechanical strength of key components, including a tie rod made from SUS 201 stainless steel. The manufactured system weighs 3.74 kg, delivers a steering ratio of 12:1, and requires 2.8 Nm of torque, ensuring both agility and driver comfort. Although the measured turning radius was 6.3 meters—above the original target—it remains functional for KMHE circuits. FEA results confirmed that all structural stresses and deformations were well within safe limits, validating the design’s stiffness and durability. Overall, the developed steering system is reliable, efficient, and suitable for application in energy-efficient vehicle competitions.
Analysis of Damage to the Induce Draft Fan Component at PLTU PT. XYZ Wilarso, Wilarso; Awang Surya; Asep Saepudin; Muhamad Ali Pahmi
R.E.M. (Rekayasa Energi Manufaktur) Jurnal Vol 10 No 2 (2025): December
Publisher : Universitas Muhammadiyah Sidoarjo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21070/r.e.m.v10i2.1767

Abstract

Damage to the Induce Draft Fan (IDF), will impact to the combustion system which serves to provide Secondary Air to meet the air needs of the combustion system in the furnace in the boiler. There are 2 IDFs in the generating unit which are operated simultaneously or alternately. The purpose of this research is to determine the damage to the IDF so that there is no decrease in power supply to PLN generators. The method used in this study used fishbone analysis. Based on the analysis, the IDF damage occurs due to abrasion on the fan blade which is caused by the blade surface in contact with the abrasive material (Fe2O3) on the flue gas. The malfunctioning of the Electrostatic Precipitator (ESP) causes the abrasive material (Fe2O3) in the flue gas to not flow to the IDF, thus damaging the blade
The Effect of Variations in the Composition of Cocoa Shell Charcoal and Peanut Shell Charcoal on Briquette Characteristics Ahmad Akromul Huda; Tawaqqal, Akbar; Hidayatullah, Syarif; Juniardi, Nurdin
R.E.M. (Rekayasa Energi Manufaktur) Jurnal Vol 10 No 2 (2025): December
Publisher : Universitas Muhammadiyah Sidoarjo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21070/r.e.m.v10i2.1777

Abstract

Agricultural biomass such as cocoa husks and peanut shells have great potential as raw materials for briquettes to support the provision of sustainable alternative energy. This study aims to evaluate the effect of variations in the composition of these two materials on the characteristics of briquettes, including calorific value, moisture content, ash content, and burning time. The study was conducted using a completely randomized design (CRD) with five treatment compositions (KC1=100:0, KC2=70:30, KC3=50:50, KC4=30:70, KC5=0:100) and three replications. Data were analyzed using Analysis of Variance (ANOVA), and if significant effects were found, the analysis was continued with Duncan’s Multiple Range Test (DMRT) at the 5% level. The results showed that a high proportion of cocoa husk resulted in higher moisture content (15.78%) and lower calorific value (3867 kcal/g), while a high proportion of peanut husk increased the calorific value to 5340 kcal/g and burning time to 84.8 minutes, but was accompanied by higher ash content (17.57%). The balanced mixture of KC3 (50:50) and KC4 (30:70) proved to offer the best compromise, with moisture content <10%, calorific value >4400 kcal/g, burning time >78 minutes, and ash content still within an acceptable range. Thus, although pure peanut shell briquettes (KC5) offer the highest performance, the combination of KC3 and KC4 is more worthy of consideration for improving briquette quality while optimizing the utilization of abundant cocoa shell waste.

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