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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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MATHEMATICS MODELLING AND EXPERIMENTAL STUDY THE EFFECT OF VORTEX WATER TURBINE BLADE DESIGN OF TURBINE EFFICIENCY Fitriana, Laila; Saputro , Herman; Purwanto, Aris; Huda, Damar Sunanil; Muslim, Riyadi
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.v16i1.1899

Abstract

The current demand for electrical energy is crucial to support facilities and infrastructure across various sectors, including household, public, and industrial areas. In Indonesia, the reliance on fossil fuels for electricity generation remains high, contributing to significant emissions. Renewable energy sources, such as water energy, present a viable solution to mitigate these emissions and enhance environmental sustainability due to their eco-friendly and sustainable characteristics. Micro hydro energy can be generated by micro-scale power plants using hydropower by converting fluid rotation into electrical energy called Gravitational Water Vortex Power Plant. In water vortex power plant, the blades have a significant influence on the produced power of turbine. For this reason, it is necessary to have a suitable blades design to produce optimal power and efficiency. This study investigates the impact of different vortex turbine blade shapes straight blade, L blade, and curved blade. We used numerical and simulation to investigate the power and efficiency of vortex-type water turbines. Simulation results indicated significant effects of blade shape variations and the distance between blades and the outlet on turbine performance. The straight blade exhibited a tangential velocity of 2.95 m/s and torque of 1.49 Nm, producing 20.94 watts with an efficiency of 84.71%. The L blade demonstrated a tangential velocity of 2.84 m/s and torque of 1.54 Nm, yielding 20.82 watts with an efficiency of 84.3%. In contrast, the curved blade showed a tangential velocity of 2.83 m/s and torque of 1.21 Nm, generating 16.32 watts with an efficiency of 65.97%. Experimental testing revealed that the curved blade produced the highest power and efficiency at 11.64 watts and 23.56%, respectively. The optimal distance between the blade and the outlet was determined to be 2 cm, achieving the same power and efficiency values.
OPTIMIZATION OF CALIPER BRACKET DESIGN AS AN EFFORT TO IMPROVE FUEL EFFICIENCY Wilujeng, Auliana Diah; Fatah, Misbakhul; Ridwan, Muhammad
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.v16i1.1911

Abstract

Ragapadmi's automobile was modified by the Sevta team so that it could compete in the KMHE race. To increase fuel efficiency, the car's materials and design were altered. In order to decrease excessive friction in the brake system, the caliper bracket needed to be adjusted. Lightweight and simple materials also needed to be used when doing repairs. Therefore, to minimize caliper friction when not braking, a perfect bracket is required. Three different caliper bracket designs were created to create a suitable (strong, light, and precise) bracket that can resist the 569.43 N braking force of the Ragapadmi automobile. Utilizing CAD and CAM tools to simulate strength, the strength of the brackets and materials is tested by creating a CNC toolpath program. The aluminium 6061 material used to make the calliper bracket is robust, lightweight, and precise. Following strength modelling, model 3 provides a mass of 0.099567 kg and a deflection value of 0.084 mm. The caliper bracket was machined in 174.86 minutes using a CNC milling machine, and its roughness value is 0.432µm, or N5 roughness class.
INVESTIGASI EKSPERIMENTAL KARAKTERISTIK KEKUATAN TARIK PADUAN RESIN FLEKSIBEL-STANDAR UNTUK MATERIAL 3D PRINTING Dyaksa, Gilang Argya; Nugraha, Felix Krisna Aji; Hermawan, Oktavianus Nekson; Putra, Mahendra Pratama; Astyanto, Achilleus Hermawan
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.v16i1.1913

Abstract

Over the years, technologies of 3D printing have enhanced the opportunity to ease the production of complex geometries. In particular, it further implies that the flexibility of materials is of a great importance. Therefore, the works covering studies of applicability on novel materials in rapid prototyping contribute to the development of additive manufacturing. The present work experimentally investigates a mechanical property, namely tensile strength, of 3D printing materials on the basis of the concentration of flexible-standard resins. Tensile strengths were obtained by a series of tensile tests. Here, the result reveals that the tensile strength monotonously decreases as the increase of the concentration of flexible resin’s concentration. Moreover, an ANOVA analysis strongly implies a consistent relationship between the tensile strength and the material’s mixture.
SOFT MAGNETIC COMPOSITE (SMC) ANALISIS DENGAN BIBLIOMETRIC Waloyo, Hery Tri; Kurniawan, Krisna Budi; Ahmad, Fauzi; Putra, Ferdiansyah; Fauzan, M. Afif; Firmansyah, Muhammad Gilang; Mujianto, Agus
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.v16i1.1917

Abstract

Soft Magnetic Composite (SMC) is a composite material made by binding iron (Fe) powder with non-magnetic materials such as epoxy resin. The main properties of SMC, which have high electrical resistance yet can efficiently conduct magnetic fields, make it a primary choice for various applications that require efficiency, reliability, and high performance. Extensive research has been conducted on SMC, making it necessary to perform a bibliometric analysis to categorize and observe developments in SMC research. The main objectives of this study are to understand patterns in scientific publications, identify the most productive research developments, determine research linkages, and identify collaboration networks related to SMC. A total of 1067 documents, 347 sources, and 2113 authors were recorded in the Scopus database between 2005 and 2024. The number of article publications has increased annually by 4.36%. China is the most productive country and also has the most extensive international collaboration networks. The majority of publications are published in journals with specific topics, primarily focusing on magnetics and magnetic materials.
DESIGN BACK PROPAGATION NEURAL NETWORK (BPNN) – PID OF ACTIVE AIR SUSPENSION BASED ON HALF CAR MODEL AT PLUG-IN HYBRID ELECTRIC VEHICLE (PHEV) Sampurno, Bambang; Windarta, Kyla Anisa; Toriki, Mohammad Berel; Rusdiyana, Liza; Suryandani, Dika Andini
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.v16i1.1919

Abstract

A Plug-In Hybrid Electric Vehicle (PHEV) is a car with a combination of an electric motor and an internal combustion engine (ICE). The implementation of active air suspension in this research uses a half car model. Mathematical modeling is used to obtain system responses such as body displacement, body acceleration, rear wheel displacement, and rear wheel acceleration using MATLAB software. There are 3 test modes, namely passive suspension, active suspension, and implementation using a neural network-based control system. Based on these 3 test modes in 3 conditions, the use of passive suspension for body displacement produces a maximum overshoot of 133% and a settling time of 2.15 seconds. Meanwhile, the active suspension produces 43.33% and a settling time of 0.7 seconds. When using a neural network, it produces 50% and a settling time of 2.14 seconds. Some while, the use of passive suspesion foor body acceleration produces a maximum overshoot of 133%, arms of 124,2, and a settling time of 2.15 seconds. Meanwhile, the active suspension produces maximum overshoot of 43.33% , arms of 2.92, and a settling time of 0.7 seconds. When using a neural network, it produces maximum overshoot of 50%, arms of 2.92 and a settling time of 2.14 seconds.
INNOVATIVE DESIGN AND FABRICATION OF FIXTURES FOR ENHANCED ULTRASONIC TESTING Hakim, Rahman; Hapsari, Windi; Irawan, Benndy Haddli
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.v16i1.1925

Abstract

Ultrasonic Non-Destructive Testing (UT) is essential in manufacturing to ensure measurement accuracy by calibrating tools against specified standards. However, UT calibration often faces challenges such as oil spills, usability issues, and lengthy processes. This study addresses these challenges by designing a specialized fixture to streamline the calibration of a 33.8 kg cylindrical UT calibration block. The fixture's design focuses on user requirements, enabling smooth block rotation and effective oil management during calibration. Key design principles were applied, including Degrees of Freedom (DoF) and locating and clamping mechanisms. Finite Element Method (FEM) simulations demonstrated a maximum stress value of 18.495 MPa and a Factor of Safety (FoS) of 22.89, confirming the fixture’s structural reliability. The proposed fixture reduced calibration cycle time by 48.7%, significantly enhancing efficiency. In conclusion, the fixture offers a safe, practical, and effective solution to optimize UT equipment calibration.
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.

Page 94 of 97 | Total Record : 965

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