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Redaksi Jurnal Rekayasa Mesin Jurusan Teknik Mesin Fakultas Teknik, Universitas Brawijaya Jl. MT. Haryono 167 Malang, Jawa Timur Indonesia 65145
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Rekayasa Mesin
Published by Universitas Brawijaya
ISSN : 23381663     EISSN : 24776041     DOI : 10.21776/ub.jrm
Core Subject : Engineering,
Mechanical Engineering
Rekayasa Mesin is published by Mechanical Engineering Department, Faculty of Engineering, Brawijaya, Malang-East Java-Indonesia. Rekayasa Mesin is an open-access peer reviewed journal that mediates the dissemination of academicians, researchers, and practitioners in mechanical engineering. Rekayasa Mesin accepts submission from all over the world, especially from Indonesia. Rekayasa Mesin aims to provide a forum for national and international academicians, researchers and practitioners on mechanical engineering to publish the original articles. All accepted articles will be published and will be freely available to all readers with worldwide visibility and coverage. The scope of Rekayasa Mesin are the specific topics issues in mechanical engineering such as design, energy conversion, manufacture, and metallurgy. All articles submitted to this journal can be written in Bahasa and English Language.
Arjuna Subject : -
Articles 980 Documents
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Analysis of Surface Roughness Parameters of Copper Alloy Ring Synchronizer Outer Components Fabricated by CNC Turning on the Okuma 2SP-150H Lathe Abbas, Aries; Saputra, Alfian Ady
Jurnal Rekayasa Mesin Vol. 17 No. 1 (2026)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v17i1.2126

Abstract

The change of insert chips in the CNC Turning Surface Finishing process has led to mismatched turning parameters and a deterioration in the surface roughness quality of the Ring Synchronizer Outer. As a result, it is necessary to optimize the cutting parameters to maintain surface roughness quality and improve process time efficiency. A process capability index analysis (Cp and Cpk) was conducted to ensure process stability under mass production conditions. This study adopts a quantitative and experimental research method. The research activities include calculating three CNC Turning Surface Finishing parameters, conducting CNC Turning process trials, measuring surface roughness, and calculating the Cp and Cpk values. The independent variable in this study is the feed rate (mm/rev), while the dependent variable is surface roughness, represented by the Ra (average roughness) value in micrometers (μm). The results of the CNC Turning Surface Finishing tests for the three parameters are as follows: Parameter 1 (n = 2000 rpm and f = 0.04 mm/rev) produced a Ra value of 0.284 μm (very smooth), with a cutting time of 2.44 seconds, Cp = 27.59, and Cpk = 4.90. Parameter 2 (n = 2000 rpm and f = 0.07 mm/rev) resulted in a Ra of 0.547 μm (smoother), cutting time of 1.39 seconds, Cp = 20.51, and Cpk = 7.01. Parameter 3 (n = 2000 rpm and f = 0.10 mm/rev) achieved a Ra of 0.803 μm (smooth and within standard), with a cutting time of 0.975 seconds, Cp = 20.77, and Cpk = 10.29. Based on these results, it can be concluded that Parameter 3 is the most suitable and time-efficient configuration.
The Effect of Minimum Quantity Lubrication (MQL) and Depth of Cut on Surface Roughness in Turning of AISI 1020 Steel Rahul, Rahul; Rismanto, Muhammad; Iqbal, Muhammad; Sirajuddin, Awal Syahrani; Asmara, Anjar; Hair, Jumadil
Jurnal Rekayasa Mesin Vol. 17 No. 1 (2026)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v17i1.2127

Abstract

This study aims to investigate the effect of the Minimum Quantity Lubrication (MQL) method using wasted cooking oil and depth of cut on surface roughness in the turning process of AISI 1020 steel. The tests were conducted on a manual lathe machine with a spindle speed of 800 rpm, a cutting length of 100 mm, and depth of cut values of 0.2 mm, 0.4 mm, and 0.6 mm. The independent variables used were MQL with wasted cooking oil and depth of cut, while the dependent variable observed was surface roughness. The test results show that the lowest surface roughness (Ra) value of 1.423 µm was obtained at a depth of cut of 0.2 mm with MQL. Conversely, the highest surface roughness value of 3.515 µm was recorded at a depth of cut of 0.6 mm without MQL. Increasing the depth of cut resulted in an increase in surface roughness. However, the application of the MQL method with wasted cooking oil can reduce surface roughness compared to the turning process without MQL. Therefore, the combination of wasted cooking oil as an MQL lubricant and optimal depth of cut can improve surface quality and support the principles of green manufacturing by utilizing wasted cooking oil, which helps reduce the environmental impact of industrial waste.
Biosurfactant-Assisted Hydrogen Evolution: Effects of Sapindus Rarak Extract on Alkaline Electrolysis Performance Santoso, Mardi; Sinurat, David Fernando; Ahmad, Anton Royanto; Hamidi, Nurkholis; Purnami, Purnami
Jurnal Rekayasa Mesin Vol. 17 No. 1 (2026)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v17i1.2151

Abstract

Hydrogen production through alkaline water electrolysis is a promising pathway for clean energy generation, yet its efficiency is often limited by gas bubble accumulation on electrode surfaces. This study explores the use of a natural surfactant derived from Sapindus rarak (lerak) as a green additive to improve hydrogen evolution reaction (HER) performance. Experimental results show that the natural surfactant-enhanced system achieved a 135% increase in cumulative hydrogen yield over 10 minutes. Mechanistically, the natural surfactant lowered the surface tension, reduced bubble nucleation size, and promoted faster detachment from the electrode surface, thereby preserving catalytic activity. Compared to synthetic surfactants like sodium lauryl sulfate, Sapindus rarak offers advantages in natural degradability, environmental safety, and regional availability. This study demonstrates that natural plant-based surfactants can serve as effective, eco-friendly enhancers in electrochemical hydrogen production. The results provide a foundation for integrating natural surfactants into scalable and sustainable green hydrogen systems.
Optimization of Solar Panel Tilt for Enhanced Electrical Power Output based on Solar Radiation Variations in Cilacap Soolany, Christian; Pangestu, Nur Aji Bangkit Barkah; Waluyo, Didi Zinedine; Sutisna, Setya Permana
Jurnal Rekayasa Mesin Vol. 17 No. 1 (2026)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v17i1.2185

Abstract

The performance of photovoltaic (PV) systems in tropical regions such as Indonesia is strongly influenced by the panel tilt angle, which determines the amount of solar radiation captured. An inappropriate orientation can cause substantial energy losses and reduce overall system efficiency. This study experimentally investigates the optimal tilt angle for a 100 Wp monocrystalline solar panel to maximize power generation in Cilacap, Indonesia (7.6252° S, 109.1134° E). The experiment was conducted in November 2024 under clear sky conditions, with hourly measurements of solar irradiance, and electrical power output at three tilt angles: 30°, 45°, and 60°. The results show that the 30° tilt angle consistently produced the highest performance, reaching a maximum power output of 194.5 W and an efficiency of 19.5% under peak solar irradiance of 1030 W/m² at 11:00 WIB. In contrast, the 60° configuration exhibited the lowest output, particularly during the afternoon period. It is concluded that a fixed tilt angle of 30° provides the most effective configuration for photovoltaic installations in Cilacap, aligning with the solar geometry of tropical regions.
Effect of Pyrolysis Temperature Variation on Optimization of Tobacco Stalk Biochar Characteristics Kosjoko, Kosjoko; Abidin, Asroful; Hadi, Danang Kumara; Rizkina, Fitriana Dina
Jurnal Rekayasa Mesin Vol. 17 No. 1 (2026)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v17i1.2193

Abstract

Tobacco stalk waste is an agricultural residue with high potential for development as a renewable energy source through a thermochemical conversion process. This study aims to evaluate the effect of varying pyrolysis temperature on the physical and chemical characteristics of biochar produced from tobacco stalk, in order to determine the optimum temperature for producing the best quality product. The method used was a closed pyrolysis process in a stainless-steel reactor at three temperature variations: 290, 390, and 490°C for 60 minutes. The pyrolyzed biochar was analyzed using proximate analysis, calorific value testing, and chemical functional group characterization using Fourier transform infrared spectroscopy. The results showed that higher pyrolysis temperatures consistently decreased moisture and volatile matter content, while increasing the bound carbon content and calorific value of the biochar. At 490°C, the best biochar characteristics were obtained with a bound carbon content of 56.25%, a moisture content of 4.5%, volatile matter of 24.3%, and the highest calorific value reaching 5521.90 cal/g. Chemical structure analysis also indicated the formation of more stable functional groups at higher temperatures, indicating a more advanced level of carbonization. These findings indicate that within the investigated temperature range (290–490°C), 490°C yielded the biochar with the most favorable characteristics for solid fuel applications, specifically regarding fixed carbon content and calorific value. While 490°C represents the peak performance in this study, it serves as a critical operational point for achieving advanced carbonization in tobacco stalk waste. This research provides an important contribution to the development of efficient tropical biomass processing technologies. It expands the database of thermal and chemical characteristics of agricultural waste-based biochar, which has been understudied to date.
Effect of High Concentration Alkali Treatment on the Mechanical and Structural Properties of Doyo Fibers (Curculigo Latifolia) Setiawan, Ferry Bayu; Setyarini, Putu Hadi; Irawan, Yudy Surya
Jurnal Rekayasa Mesin Vol. 17 No. 1 (2026)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v17i1.2321

Abstract

The growing demand for sustainable materials has increased interest in natural fibers as eco-friendly reinforcements. Doyo fiber (Curculigo latifolia) from East Kalimantan remains insufficiently characterized despite its ecological potential. This study investigates the effect of alkali treatment concentration and immersion time on the mechanical and structural properties of doyo fibers. Fibers were treated using NaOH solutions (5–10%) and analyzed through tensile testing, Fourier transform infrared spectroscopy (FTIR), and field emission scanning electron microscopy (FESEM). Untreated fibers exhibited the highest tensile strength (176.83 MPa), while moderate treatment (5% NaOH for 90 min) preserved comparable strength (171.52 MPa) with improved surface activation. Aggressive treatment (10% NaOH) reduced tensile strength below 110 MPa due to cellulose degradation. These results demonstrate that alkali treatment requires careful optimization to balance performance enhancement and structural integrity.
Design of a Portable Quick‑Release Drive System for Conventional Manual Wheelchairs to Enhance Comfort and Accessibility Siregar, Rolan; Owen, Michael; Purba, Samuel Parsadaanta
Jurnal Rekayasa Mesin Vol. 17 No. 1 (2026)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v17i1.2356

Abstract

Conventional manual wheelchairs are widely used for indoor mobility; however, their operation is limited by the user’s ability to generate propulsion force, which affects travel range and the level of independence. This study presents the design and development of a portable drive system equipped with a quick-release mechanism, enabling fast installation and removal without permanent modification to the wheelchair. The proposed system employs a 120 W DC motor and a 24 V, 4.5 Ah battery. The research methods include mechanical and electrical power requirement calculations, CAD-based design, finite element analysis (FEA) for structural strength verification, and prototype fabrication. Simulation results indicate that the structure can support an 80 kg load with a safety factor of 1.23. The prototype achieves a maximum speed of approximately 15 km/h, with an operating time of about 1 hour at maximum load. The proposed quick-release portable drive system is expected to enhance user mobility and independence, thereby improving comfort and accessibility in everyday use.
Process–Composition–Property Relationships of Blended Coconut Shell–Teak Leaf (Tectona Grandis) Powder Biochar Briquettes for Solid Renewable Fuel Applications Pangestu, Kukuh Andreng; Saptoadi, Harwin
Jurnal Rekayasa Mesin Vol. 17 No. 1 (2026)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v17i1.2364

Abstract

The increasing demand for sustainable solid fuels has driven the development of biochar briquettes based on coconut shells and teak leaves with tapioca starch as a binder. This study evaluated the effect of the mixing ratio of coconut shell and teak leaf biochar (50:40, 60:30, and 70:20; 10% binder) on the physical, thermal, and mechanical properties of briquettes carbonized at 450 °C for 3 hours and characterized by moisture content, ash content, calorific value, density, and impact resistance index (IRI). The results showed that an increase in the fraction of coconut shell biochar reduced the moisture content (6.124–5.616%) and ash content (13.916–11.100%), and increased the calorific value (6050.36–6557.90 cal g⁻¹), density (14.712–16.347 kg m⁻³), and IRI (95.866–96.536%). The best composition was obtained with 70% coconut shell biochar, 20% teak leaf biochar, and 10% binder, which produced high-quality briquettes with the potential to be used as renewable solid fuel from agricultural and forestry waste.
Design and Structural Performance Evaluation of a Motorcycle Disc Brake Testing Device using Finite Element Method Yana, I Nyoman Bramastra; Muthoriq, Ery; Gunawan, Gunawan; Hidayat, Dwi Wahyu
Jurnal Rekayasa Mesin Vol. 17 No. 1 (2026)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v17i1.2400

Abstract

The increasing demand for reliable motorcycle braking systems requires accurate performance evaluation under controlled conditions, where a brake testing device plays an important role and its structural integrity becomes a key factor in ensuring safe and stable operation. The design and structural evaluation of a motorcycle disc brake testing device are conducted using the Finite Element Method (FEM), focusing on the main components including the frame, load actuator, and load holder under static loading conditions. The structure is constructed using ASTM A36 steel to provide adequate strength and stiffness, while mechanical components such as the electric motor, brake disc, and shaft are simplified as equivalent loads to reduce computational complexity without compromising realistic working conditions. The simulation results show that the maximum von Mises stresses on the frame, load actuator, and load holder are 42.92 MPa, 56.02 MPa, and 68.18 MPa, respectively, which are below the material yield strength of 250 MPa, with maximum displacements within acceptable limits and safety factors greater than 3, indicating that the structure is safe and reliable for operation.
Comparative Analysis of Structure and Material of Absorption Box on Rear Underrun Protection Device using Simple Additive Weighting Reyhan, Rizki Nabil; Pranoto, Ethys; Tohom, Frans; Muthoriq, Ery; Hidayat, Dwi Wahyu
Jurnal Rekayasa Mesin Vol. 17 No. 1 (2026)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v17i1.2403

Abstract

Rear-end collisions between passenger vehicles and heavy trucks frequently result in high fatality rates due to underride events, in which the smaller vehicle slides beneath the truck. This underscores the need for improved passive safety systems, particularly the Rear Underrun Protection Device (RUPD), which serves to absorb impact energy. However, many existing RUPD designs only meet minimum regulatory requirements without optimizing energy absorption performance. This study aims to analyze and compare the influence of varying material types and structural configurations of the energy absorption box on the RUPD’s energy absorption capability. The evaluation focuses on deformation, stress distribution, and absorbed energy under impact loading conditions. The methodology involves three-dimensional modeling using SolidWorks and finite element method (FEM) simulations in Ansys. Materials including ASTM A36 steel, AISI 1020 steel, and Aluminum 2024 are combined with honeycomb structural variations. Simulations are conducted in accordance with UN ECE R.58 standards. Furthermore, the Simple Additive Weighting (SAW) method is applied to determine the optimal design. The results indicate that both material selection and structural configuration significantly affect energy absorption performance, with the honeycomb structure using filler with Aluminum 2024 demonstrating superior capability. This study contributes to the development of more effective RUPD designs aimed at enhancing road safety.

Page 98 of 98 | Total Record : 980

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