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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.
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Articles 43 Documents
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Search results for , issue "Vol. 16 No. 1 (2025)" : 43 Documents clear
ANALISIS PENGUJIAN STATIS MOTOR MATIC 110 CC MENJADI MOTOR LISTRIK 2 KW Sinambela, Rismen
Jurnal Rekayasa Mesin Vol. 16 No. 1 (2025)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v16i1.1961

Abstract

Electric motorbike conversion is one of the right solutions to reduce carbon emissions, alternative energy to replace depleting fossil fuels, reduce the impact of congestion and the expensive price of electric motorbikes. For this reason, information is needed in terms of proper planning, design, and calculation of operational activities related to efficiency, cost, safety, energy saving, quality, and maintenance. The planning of an electric motorbike using a 2 kW 72 Volt 20 Ah BLCD motor, a 72 V 500Watt controller, and a 72 V 20 Ah Gesits li-NCM battery, conducted static testing for one hour against speed variations of 30, 50, and 70 km/hour. This study shows that, the electric motorbike at the highest speed of 70 km / h the battery temperature is stable at 37.9 ° C below 45 ° C in the package, power 1,472.91 Watt, current 20.58 A, voltage 71.57 Volts, torque 4.5 Nm, battery consumption 39.8%, charging time 1.59 hours and costs incurred of Rp 645.82. It is clear that electric motorbikes have better value in terms of features, energy usage, running costs, and battery temperature than combustion motors.
EFFECT OF FLASK VIBRATION ON GRAY CAST IRON CHARACTERISTICS PREPARED BY LOST FOAM CASTING Sutiyoko, Sutiyoko; Lutiyatmi, Lutiyatmi; Suyitno, Suyitno; Soekrisno, R.
Jurnal Rekayasa Mesin Vol. 16 No. 1 (2025)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v16i1.1963

Abstract

Parameter selection in lost foam casting can reduce the casting defect. Flask vibration is a critical parameter that significantly influences the casting quality in the lost foam casting. This research aims to investigate the effect of the flask vibration duration on fluidity, porosity, and surface roughness of gray cast iron in the lost foam casting. The unbounded silica sand was placed in the flask for the vibration process. An expanded polystyrene foam pattern which is cross-shaped and has four thicknesses was embedded in unbounded silica sand. The flask was vibrated by a vibrator machine for 2–10 minutes to compact the molding sand in amplitude and frequency of 1 mm and 23 Hz. Fluidity was measured based on the length of the casting for each thickness, while porosity was measured using the Archimedean principle to obtain the actual density. The fluidity and the porosity of the gray cast iron increase with the flask vibration duration. On the other hand, increasing the flask vibration duration decreases the surface roughness of this material.
KARAKTERISTIK BIOPLASTIK PATI SAGU (METROXYLON SP.) SETELAH PAPARAN CAHAYA ULTRAVIOLET Sulaeman, Budiawan; Arman, Lukmanul Hakim
Jurnal Rekayasa Mesin Vol. 16 No. 1 (2025)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v16i1.1965

Abstract

This study aims to explore the characteristics of sago starch (Metroxylon sp.) after exposure to ultraviolet (UV) light, using a local sago variety known as Tawaro. Sago starch underwent Heat Moisture Treatment (HMT) to achieve 0% water content. Furthermore, this sago starch was used as a raw material for bioplastic production. The results of preliminary tests showed a tensile strength of 0.227 N/mm² (D0). Biodegradability testing was carried out on bioplastics exposed to UV light for 24 hours (D1UV24), 48 hours (D2UV48), and 72 hours (D3UV72). Fourier Transform Infra-Red (FTIR) analysis was used to identify the absorption patterns resulting from UV exposure. The results showed consistent absorption patterns before and after UV treatment, with no changes in functional groups or the emergence of new functional groups. However, changes detected in the intensity of the OH band broadening indicate photodegradation or oxidation. This is due to the formation of hydrogen bonds between the –OH groups of starch and glycerol. In addition, photodegradation affects mechanical properties, especially tensile strength. D1UV24 (0.406 N/mm²) and D2UV48 (0.619 N/mm²) showed an increase in tensile strength, while D3UV72 (0.538 N/mm²) decreased. This decrease was caused by prolonged oxidation, activating the polymer chain with free radicals. Contact angle testing showed that after the photodegradation process, the bioplastic became hydrophilic. These characterization data provide insight that Tawaro sago starch with 0% water content has the potential to be applied and developed as an environmentally friendly packaging product.
PURE PALM OIL SPRAY CHARACTERISTICS OF DIESEL FUEL INJECTOR Mamola, Randi; Nurcholik, Samsu Dlukha; Prahmana, Rico Aditia; Juangsa, Firman Bagja; Pratama, Raditya Hendra; Prihasto, Bima; Suardi, Suardi; Sa’adiyah, Devy Setiorini
Jurnal Rekayasa Mesin Vol. 16 No. 1 (2025)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v16i1.1981

Abstract

Diesel engines are widely used in many sectors due to their advantages of high energy density. To reduce emissions in diesel engines, a step that can be taken is to use renewable biofuel such as pure palm oil, which has a high viscosity and is difficult to get a fine atomization process in fuel spraying. However, a detailed analysis of the spray characteristics using pure palm oil fuel on conventional diesel engines has yet to be available. In this research, high-speed imaging was conducted to investigate the spray characteristics of pure palm oil compared to diesel fuel. The result shows that (1) at the start of the injection stage, both pure palm oil and diesel fuel have similar shapes, (2) the spray angle of pure palm oil is smaller due to orifice wall cavitation not occurring in the orifice, (3) and at the end of the injection stage, pure palm oil has larger droplets, which is also more difficult to atomize.
STUDY OF UTILIZING PINEAPPLE LEAF EXTRACT FOR THE GREEN SYNTHESIS OF FE3O4 AND ITS IMPREGNATION ON OIL PALM (EFB) Parmita, Ade Yusariarta Putra; Dewanto, Hizkia Alpha; Tajalla, Gusti Umindya Nur; Akbar , Aulia Arif; Tajalla, Nur
Jurnal Rekayasa Mesin Vol. 16 No. 1 (2025)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v16i1.1982

Abstract

The formation process of Fe3O4/EFB fiber was carried out by synthesizing FeCl3.6H2O and pineapple leaf extract using the green synthesis method. Pineapple leaf extract contains hydroxyl, carbonyl, and amine functional groups that can act as reductants and capping agents for the synthesized metal salts. Then, the in-situ impregnation was carried out to attach magnetite to the EFB fibers. The EFB fibers were then soaked in a mixture of precursor solution and pineapple leaf extract with a variation of liquor-to-good ratios of 1:40, 1:60, and 1:80 to determine the optimal ratio in forming Fe3O4/EFB fiber. In XRD testing, the three variations of samples have peak characteristics of magnetite (Fe3O4). SEM-EDX results also showed the Fe content from three samples tested. In the UV-Vis examination, the 1:80 sample has the highest percent degradation with 68.09%, and the lowest percent degradation belongs to untreated EFB with 12.44%. Visual tests showed that the 1:40, 1:60, and 1:80 variations could degrade methylene blue after 12 hours with addition of H2O2. H2O2 increases the reactivity of Fe3O4 by providing hydroxyl radicals that can attack pollutants and mineralize methylene blue into CO2 and H2O.
DESIGN AND ANALYSIS OF AN AXIAL FLUX PERMANENT MAGNET GENERATORS WIND TURBINE FOR AUTOMATIC STACKING CRANES Maharani, Aisyah Aira Putri; Wahid, Muhamad Rizalul; Gianti, Mahmudah Salwa; Mulya, Tri Seda; Rahayuningtyas , Ari
Jurnal Rekayasa Mesin Vol. 16 No. 1 (2025)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v16i1.1984

Abstract

Automatic Stacking Cranes are indispensable tools in modern ports that can transfer containers between the landside and the waterside. These cranes are powered by electricity and consume significant amounts of energy to meet annual production demands. This substantial electricity consumption often strains the port's power grid during voltage and current fluctuations, which can destabilize the ASC's power supply. Wind turbines offer a promising alternative energy source to address these problems. This study delves into the analysis of the optimal Axial Flux Generator structure for wind turbines and calculates the associated energy losses to determine the feasibility of a wind turbine system capable of supporting the ASC's power demands. The findings reveal that employing an AFG-based wind turbine can generate the required 88,497 Watts of power for the ASC, with an average rotational speed of 1,655 rpm. This represents an annual electricity cost saving for the port of approximately 39,701,029 Rupiah.
EXPERIMENTAL INVESTIGATION ON THE MECHANICAL BEHAVIOR OF VACUUM INFUSION CFRE COMPOSITE WITH VARYING ORIENTED CARBON FIBER AND ITS APPLICATION ON ACTUAL COMPONENTS Mujiyono, Mujiyono; Utomo, Yoga Wahyu; Nurhadiyanto, Didik; Wibowo, Heri; Arifin, Achmad
Jurnal Rekayasa Mesin Vol. 16 No. 1 (2025)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v16i1.2010

Abstract

Carbon fiber-reinforced epoxy (CFRE) has better performance properties and is commonly used in the aviation industry. The placement of carbon fiber will affect the mechanical properties of the resulting composite material. The specific application to actual components has yet to be discovered regarding the mechanical capabilities of the CFRE utilization. Therefore, it is essential to investigate further the mechanical behavior of CFRE composites with varying oriented carbon fibers, especially those produced using the vacuum infusion method with a volume fraction of 40%. This study presents an experimental investigation of the CFRE composite with varying oriented carbon fibers in unidirectional, bidirectional, and forged. The result shows composite materials' mechanical characteristics, particularly in the properties of Young's modulus, Poisson ratio, and shear modulus. The unidirectional fiber composites are only suitable for tensile loads in line with the fiber, while bidirectional fiber composites should be cautiously undertaken, as tensile loads applied to the Z-axis may lead to adverse effects; conversely, shear forces can be safely applied to all three axes. The forged fiber direction results in each loading direction having separate capabilities, which are challenging to anticipate. The application of CFRE on an actual component should entail the integration of diverse fiber orientations within a single composite layer, particularly in highlighting manufacturing folding arm components and their adaptability. The test results demonstrate that the maximum load that can be tolerated by the folding arm before failure fulfills the requisite strength criteria, thus allowing for a safety factor of 7.8, which confirms the safety of the CFRE with combined fiber orientation in producing folding arm components.
STRUCTURAL ANALYSIS OF SEMI-SUBMARINE MONOHULL SHIP FOR TOURISM APPLICATIONS BY USING FINITE ELEMENT METHOD Hutagalung, Christian Imanuel; Bahatmaka, Aldias; Aryadi, Widya; Putrananda , Musdika Bagas Satria; Puteri, Berliana Ayarent
Jurnal Rekayasa Mesin Vol. 16 No. 1 (2025)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v16i1.2020

Abstract

The research assesses the structural integrity of a semi-submersible monohull glass-bottom vessel designed for tourism, featuring a hull length of 9 meters. Finite Element Analysis (FEA) was employed to simulate five loading scenarios: full load, 75% capacity, 50% capacity, 25% capacity, and no load. The ship's structural basis was designated as the boundary condition. The peak equivalent stress under full load was 297.58 MPa, with validated values at 293.93 MPa. Additional scenarios demonstrated comparable concordance between FEA simulations and validations, with stress values spanning from 296.85 to 297.4 MPa and validation results ranging from 293.4 to 293.79 MPa. All calculated safety factors surpassed 2.25, guaranteeing adherence to SOLAS Chapter II-1 rules. The results validate that the ship's hull design complies with structural integrity norms under operational loads, instilling confidence in its performance for tourism purposes.
KARAKTERISASI KEKERASAN DAN KEKUATAN TARIK BAJA TAHAN KARAT SS304 DENGAN VARIASI ELEKTRODA LAS BUSUR LISTRIK Wisnujati, Andika; Mudjijana, Mudjijana; Sutoyo, Sutoyo
Jurnal Rekayasa Mesin Vol. 16 No. 1 (2025)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v16i1.2029

Abstract

This study examines the hardness and tensile strength characterization of SS304 stainless steel welded using different electrode variations in the Shielded Metal Arc Welding (SMAW) process. The research focuses on three types of electrodes: NSN 308, NSN 309L, and NSN 312, to evaluate their influence on the mechanical properties of the weld metal. Hardness testing was conducted using the Vickers method with a 200-gf load, while tensile strength testing was performed to assess ultimate tensile strength (σu), yield strength (σy), and elongation (ε). The results indicate that the selection of electrodes significantly affects the hardness and tensile properties of the welded joints. NSN 312 exhibited the highest hardness values, particularly in the weld metal and filler areas, suggesting the formation of hard phases such as martensite or chromium-rich ferrite, making it suitable for wear-resistant applications. NSN 309L demonstrated moderate hardness, indicating a more balanced microstructure that provides good toughness and ductility. NSN 308 showed the lowest hardness values, which can be beneficial for applications requiring greater deformability. In the tensile test, NSN 309L achieved the highest ultimate tensile strength 47.77 Kg/mm² and elongation 45%, suggesting an optimal balance of strength and ductility. NSN 312 exhibited the highest yield strength 46 Kg/mm², indicating better resistance to plastic deformation. Meanwhile, NSN 308 had lower tensile properties compared to the other electrodes.  Overall, electrode selection should align with specific application requirements. NSN 312 is recommended for wear-resistant applications, NSN 309L for structures requiring both strength and ductility, and NSN 308 for applications with lower mechanical stress.
OPTIMALISASI MATERIAL DAN PROFILE REINFORCEMENT BEAM GUNA MENINGKATKAN ENERGI SERAP BENTURAN BERBASIS SIMULASI FEM Sukoco, Leonardo Paksi; Tohom, Frans; Pranoto, Ethys
Jurnal Rekayasa Mesin Vol. 16 No. 1 (2025)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v16i1.2106

Abstract

Bumpers are critical structures in passenger vehicles, designed to absorb low-speed impact energy. This study examines the effect of profile combinations (C-Hat and Double-Hat Section) and materials (Steel Bare/E.G.-H.F.80Y 100T, CFRP T700S, Aluminium 2024-T86) on MPV bumper reinforcement beam performance under UN ECE R.42 standards. Finite Element Method (FEM) simulations using ANSYS Explicit Dynamic with longitudinal impact tests (4 km/h) and side tests (2.5 km/h) were conducted to evaluate deformation, stress, and energy absorption. Results revealed that C-Hat Section with Aluminium 2024-T86 delivered optimal performance: von Mises stress 194.40 MPa, deformation 1.2057 mm, and energy absorption 160.31 J at 4 mm thickness. The Weighted Sum Model (WSM) analysis confirmed this combination as the best choice (score 1.773). The proposed design meets safety criteria while maintaining weight efficiency for MPV applications.

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