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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 965 Documents
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THE EFFECT OF AIR FLOW RATE ON THE CHARACTERISTICS OF PULVERIZED CATALYTIC COMBUSTION OF RICE HUSK WASTE BIOMASS Hamidi, Nurkholis; Yuliati, Lilis; Purnami; Maulana , Syahrizal
Jurnal Rekayasa Mesin Vol. 16 No. 2 (2025)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v16i2.1856

Abstract

The purpose of this study was to determine the effect of airflow rate on the characteristics of catalytic combustion of pulverized rice husk biomass. Natural zeolite was used as the catalyst in this study. The combustion characteristics included the value of Initiation Temperature of Volatile Matter (ITVM), Initiation Temperature of Fixed Carbon (ITFC), peak of weight loss rate temperature (PT), Burning out Temperature (BT), mass reduction graph (TGA), mass reduction rate (DTG), heating value, and activation energy were measured. The sample used was 45-200 µm in size, and the percentage of catalyst was 7%. The research was carried out using 4 variations, including 2.9 ml/min, 5.8 ml/min, 9.0 ml/min, and 14.8 ml/min, each of which contains the same air composition, namely 80% nitrogen and 20% oxygen. The results showed that the greater the airflow contained in the pulverized biomass catalytic combustion process could increase the combustion characteristics including reducing the value of ITFC, PT, and BT. In addition, it also accelerates the rate of mass reduction and decreases its activation energy due to increasing pressure along with increasing temperature in the combustion chamber, besides that excess air also causes the combustion that occurs in more perfect combustion.
OIL FROM THE PYROLYSIS OF RICE HUSK BIOMASS AND COFFEE GROUNDS MIXTURE WITH POLYPROPYLENE PLASTIC Wulandari, Rani; Wijayanto, Danar Susilo; Saputra, Taufik Wisnu
Jurnal Rekayasa Mesin Vol. 16 No. 2 (2025)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v16i2.1870

Abstract

This study aims to determine the effect of the ratio of the composition of the mixture of rice husk and coffee grounds with PP plastic on quantity (volume of pyrolysis oil and distillation results) and quality (yield, density, viscosity, visual and color), as well as to determine the ratio of biomass variation with plastic that produces the most oil and the best quality. This study was conducted by mixing rice husk and coffee grounds biomass with PP plastic in the form of RDF-3 with a variation in composition of 0% : 100%, 25% : 75%, 50% : 50%, 75% : 25%, and 100% : 0%. The pyrolysis results are in the form of oil which is then distilled to separate the compounds contained in it and produce clean oil, then the volume of pyrolysis oil and distillation results is measured, yield testing, density, viscosity, visual and color are tested. The test results showed that there was an effect of a mixture of rice husk and coffee grounds biomass with PP plastic on quantity (volume of pyrolysis oil and distillation results) and quality (yield, density, viscosity, visual and color). The volume of pyrolysis oil and distillation products was the highest ratio of 100% PP with pyrolysis oil of 616.67 ml and distilled oil of 178 ml. The results of the best yield test were obtained with a ratio of 100% PP of 82.39%. The best density test obtained a 100% PP ratio of 846.6 kg/m3, the results of this density lead to the specification of diesel fuel. The viscosity value of the best pyrolysis oil is obtained with a ratio of 100 % PP of 0.65499 cP which leads to the specification of gasoline type fuel. The best visual and color testing of pyrolysis oil was obtained with a ratio of 100% PP with a clear and bright visual appearance with a clear yellow color, which is in accordance with the specifications of diesel and gasoline fuel. It was concluded that the best configuration was obtained with a ratio of 100% PP which led to the specification of diesel fuel.
NUMERICAL STUDY OF THE BUBBLE FORMATION MECHANISM IN HORIZONTAL LIQUID-GAS FLOW IN A T-JUNCTION MINICHANNEL Widodo, Gilang Destya; Dharma, Untung Surya; Deendarlianto, Deendarlianto
Jurnal Rekayasa Mesin Vol. 16 No. 2 (2025)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v16i2.1872

Abstract

The purpose of this research was to study the mechanism of air bubble formation at the T-Junction Minichannel. Numerical simulations were carried out using the Volume of Fluid (VOF) method on OpenFOAM v2112 with the Pressure Implicit with Splitting of Operators (PISO). Working fluids of water and air were simulated in a T-junction minichannel with a rectangular cross section size of 1.25 x 2.25 mm with a hydraulic diameter of 1.6 mm and a connection radius of 1.12 mm. Two-phase flow is simulated using samples in the air speed range Ug = 0.59 m/s – 1119 m/s and water speed Ul = 0.81 m/s – 1.16 m/s. The results showed that the mechanism for the formation of air bubbles is influenced by the water flow mechanism which maintains the volumetric flow rate along with the growth of air bubbles in the flow cross-section direction which causes an increase in water velocity in the gap between the flow interface and the wall, so the shear stress of the water flow increasing at the flow interface causes the air bubbles to be pushed to flow faster. The velocity of water and air flow increases as the flow cross-sectional area of each phase decreases and a rotational flow occurs in the air bubble area when the air bubble initially forms. Pressure increase occurs in the flow of air and water just before the air bubble break up and a pressure decrease significantly when the air bubble break-up.
CHARACTERIZATION OF FESE SUPERCONDUCTOR MATERIAL WITH MAGNESIUM DOPING VIA POWDER METALLURGY AND QUENCHING METHOD Maulana, Muhammad Ilham
Jurnal Rekayasa Mesin Vol. 16 No. 2 (2025)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v16i2.1903

Abstract

The effect of magnesium (Mg) content on the resistivity, microstructure, and phase characteristics of iron selenide (FeSe) was investigated. The investigation employed the Powder in Sealed Tube (PIST) method to fabricate components with intricate geometries and high dimensional precision. MgₓFe₁₋ₓSe samples (x = 0; 0.01; 0.05; 0.1) were synthesized via hand milling of high-purity Fe, Se, and Mg powders, compacted in sealed Stainless Steel (SS) 316 tubes, and sintered at 845 °C for 6 h with water quenching. Resistivity was characterized based on electrical measurements at the low temperature, surface morphology was evaluated through Scanning Electron Microscope (SEM) imaging, and phase formation was identified via X-ray Diffraction (XRD) analysis. Based on normalized measurements, the addition of 5 at% Mg results in a resistivity reduction of up to ~39%, representing the most pronounced drop across the tested compositions. MgₓFe₁₋ₓSe samples exhibits a denser and more homogeneous appearance. FeSe samples doped with varying amounts of Mg display a bulky appearance, a hallmark feature associated with powder metallurgy techniques. The presence of β-FeSe phase identified through XRD testing validates the material's composition and crystalline structure, providing essential insights into its superconducting behavior and paving the way for further detailed characterization.
OPTIMIZATION PITCH AND CLEARANCE FOR DOUBLE HELICAL RIBBON AGITATOR IN BRIQUETTE DOUGH MIXING MACHINE: ANALYSIS OF TORQUE AND POWER IMPACT Ma'a, Mustaza; Faadhilah, Hanif; Wijianto, Agus; Novison, Roni
Jurnal Rekayasa Mesin Vol. 16 No. 2 (2025)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v16i2.1905

Abstract

Briquette dough kneading machines have become an integral part of the briquette production process in industry. This study aims to analyze the effect of pitch (distance between two windings) and clearance (distance between stirrer and machine wall) on the performance of double helical ribbon stirrer in stirring briquette dough. The numerical method used is Discrete Element Method (DEM), using a stirring speed of 50 rpm and a particle size of 10 mm. In this simulation, the briquette mixture was modeled as two granular materials consisting of spherical particles. The particles were characterized using density, with briquette powder at 766 kg/m3 and starch glue at 1000 kg/m3. Simulation results show that variations in pitch and clearance significantly affect the distribution of torque, mechanical power, and dough flow. The stirrer with 157.5 mm pitch has the smallest torque and power, then the torque and mechanical power increase about 260% in the stirrer with 118.5 mm pitch. Then the stirrer with a pitch of 94.8 mm has a very high torque and mechanical power with an increase over the previous stirrer of about 1500%. The researcher concluded that the double helical ribbon stirrer with a pitch distance of 118.5 mm and a clearance of 10 mm is the appropriate stirrer to be used, with torque and power of 41.62749 Nm and 318.3174 W. This is corroborated by the simulation results with a visual assessment showing that the shear force and homogeneity are in optimal condition, although the torque and power are not too close to the design calculation results of 53.0836 Nm and 277.8042 W.
FOURIER TRANSFORM INFRARED SPECTROSCOPY INTERPRETATION DAN THERMOGRAVIMETRY/DIFFERENTIAL SCANNING CALORIMETRY ANALYSIS ON THERMOSETTING RESIN PRODUCTS WITH QUENCHING TREATMENT Sukanto, Heru; Widodo, Purwadi Joko; Arifin, Zainal; Triyono, Joko
Jurnal Rekayasa Mesin Vol. 16 No. 2 (2025)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v16i2.1908

Abstract

The quenching phenomenon observed in thermosetting epoxy resins necessitates a comprehensive investigation to mitigate its potential adverse effects on material performance. This study presents a novel approach to analyzing epoxy resins by employing Fourier Transform Infrared (FTIR) spectroscopy, Thermogravimetric Analysis (TGA), and Differential Scanning Calorimetry (DSC). Epoxy resin specimens were fabricated using a 1:1 weight ratio of diglycidyl ether bisphenol A resin and cycloaliphatic amine hardener. The quenching process was executed by submerging the specimens in water at ambient temperature following thermal exposure at 75, 100, 125, and 150°C. The FTIR and TGA/DSC analyses were verified by tensile testing, which revealed that FTIR analysis provided insights into the degree of crosslinking and hydroxyl index, while TGA/DSC data elucidated the glass transition temperature and crosslinking enthalpy. The findings demonstrated a direct correlation between the tensile strength and strain of the epoxy resin with changes in crosslinking enthalpy, and an inverse relationship with the hydroxyl index.
LOAD ANALYSIS ON VERTICAL LIFTING OVERHEAD CONVEYOR STRUCTURES Hakam, Muhamad; Wahidah, Hera Zulvi Fahriyatul; Hamzah, Fais
Jurnal Rekayasa Mesin Vol. 16 No. 2 (2025)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v16i2.1914

Abstract

Overhead conveyors are designed to facilitate the transfer of material from one location to another. One aspect that needs to be planned is the vertical lifting structure, which is the initial loading process the material is attached to the trolley at a higher level of overhead conveyor. By design this tool can facilitate material loading work, as it reduces the possibility of product damage, reduces risk of worker exhaustion and smoothest the production flow. Loading analysis is carried out using FEM-based software to determine the strength of structures on design concepts. Structural strength analysis recorded minimum safety factor is 3,928 at the end of the hoist profile, a maximum von misses stress value of 63,188 MPa at the target frame point of the long profile hoist and a limits displacement value of 0,238 mm on the loading rail. The results of the structural buckling analysis with a limit of 1 load on the design concept were 350,589 times the load.
STUDY OF UNDERWATER FRICTION STIR WELDING PROCESS PARAMETERS ON AA6005-T6 MATERIAL FOR MARINE INDUSTRY AND UNDERWATER STRUCTURE APPLICATIONS Mulyadi, Mulyadi; Fahruddin, A'rasy; Firdaus, Rachmat; Ahfas, Akhmad
Jurnal Rekayasa Mesin Vol. 16 No. 2 (2025)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v16i2.1922

Abstract

This research explores Underwater Friction Stir Welding (UFSW) on AA6005-T6 material, focusing on identifying optimal process parameters to enhance joint quality in terms of macrostructure, tensile strength, impact strength, and hardness. The results from UFSW welding of AA6005-T6 indicate that optimal process parameters yield better joint quality. The macrostructure of specimens with optimal parameters, such as spc 7, demonstrates improved homogeneity and minimal defects. The highest tensile strength and impact strength were achieved in this specimen, with a tensile strength of 117.7 MPa and an impact strength of 0.944 joule/mm², compared to other specimens. Meanwhile, the hardness of the welded joints, which is lower than the base metal, reflects the influence of process parameters on the microstructure of the joints. Overall, these results underscore the importance of precise parameter control to achieve high-quality welds. This research provides valuable insights into the effectiveness of process parameters in producing high-quality joints in underwater welding environments and highlights the potential of UFSW as an innovative method for underwater welding.
ANALYSIS OF FRACTURE ENERGY IN DOUBLE CANTILEVER BEAM SIMULATION USING COHESIVE ZONE MODEL AND VIRTUAL CRACK CLOSURE TECHNIQUE Widanto, Muhammad Hadi; Wulandari, Rini; Fairuza , Syarifah
Jurnal Rekayasa Mesin Vol. 16 No. 2 (2025)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v16i2.1932

Abstract

Composite materials are vital in aerospace and other fields due to their high load-bearing capacity and lightweight nature. However, they are prone to failure, particularly delamination, which results from high interlaminar stresses and stress concentrations. This study investigates delamination through simulations of Double Cantilever Beam (DCB) tests using various finite element methods (FEM) for fiber directions 1 and 2. GIc values from previous experiments, 0.5 N/mm for fiber direction 1 and 0.3 N/mm for fiber direction 2, were employed in the simulations. The critical force values obtained for fiber direction 1 using the cohesive contact CZM method, cohesive elements, and VCCT were 30.55 N, 30.33 N, and 30.08 N, respectively. For fiber direction 2, the values were 33.98 N, 33.38 N, and 29.94 N. Comparisons were made between two-dimensional and three-dimensional models and experimental results. The two-dimensional model exhibited an error of -1.16%, whereas the three-dimensional model showed an error of 5.10%. For fiber direction 2, errors were -1.83% and 0.85%, respectively. Positive errors indicate higher simulation results compared to experimental data, while negative errors reflect lower simulation results.
CHARACTERIZATION OF REFUSE DERIVED FUEL (RDF) PELLETS IN THE MUNICIPAL SOLID WASTE PROCESSING PROCESS Dewi, Rany Puspita; Saputra , Trisma Jaya; Fajarningrum , Nurmala Dyah; Agung, Hidayat
Jurnal Rekayasa Mesin Vol. 16 No. 2 (2025)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v16i2.1937

Abstract

Municipal Solid Waste (MSW) can be processed to be Refuse Derived Fuel (RDF) pellets. Generally, RDF is combustible waste that processed by crushing and filtering through converting it to solid fuel. RDF pellets can be made by pressing using a pellet machine names pelletizer. The research goal was to analyze the characterization of RDF pellets processing by pelletizer. The characterization tested includes calorific value and water content. The research was done by varying the composition of waste that are sample A (70% organic + 30% inorganic), sample B (60% organic + 40% inorganic), sample C (50% organic + 50% inorganic), sample D (40% organic + 60% inorganic), and sample E (30% organic + 70% inorganic). The research results showed that the highest calorific value was obtained in sample E, 4199,2754 cal/g and the lowest water content was obtained in sample E, 23,0416%.

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