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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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CHARACTERISTICS OF SUGARCANE FIBER COMPOSITE REINFORCED WITH MALAPOGA WOOD COATING Sirajuddin, Awal Syahrani; Fadly, Muhammad Syaiful; Iqbal, Muhammad; Asmara, Anjar
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.v16i2.1944

Abstract

Rapid technological developments have led to an increased demand for composite materials. However, composite materials utilizing natural fibers, such as sugarcane bagasse fiber, have not been fully optimized. This study aimed to analyze the characteristics of sugarcane bagasse fiber-reinforced composites with a Malapoga wood coating, focusing on the Modulus of Elasticity (MOE) and Modulus of Rupture (MOR). The primary material used in this research was Malapoga wood (Toona Ciliata M. Roem), which was treated with a mixture of sugarcane bagasse fiber and epoxy in volume ratios of 30%:70%, 40%:60%, and 50%:50%. The composites were then coated with Malapoga wood under cold pressure. Specimens and bending strength testing procedures followed ASTM D143 standards. Macro photographs of the fracture cross-sections of the test specimens were taken to determine the failure mechanism. The test results indicated that the composite with a 50%:50% composition exhibited highest MOE and MOR values compared to the other compositions. The maximum modulus of elasticity (MOE) at 50% was 70,256.67 kg/cm², and for 50% MOR, it was 716.36 Kg/cm². The mixture of sugarcane bagasse fiber with epoxy produced a denser coating on the Malapoga wood.
SIMULATION-BASED ANALYSIS FOR OPTIMIZING MOLD DESIGN OF PLASTIC HARDNESS TEST SPECIMENS USING KEY PARAMETERS Pujo Leksonowati, Nur Fitria; Pamungkas, Nurman; Manurung, Meilani; Aryswan, Adhe; Hakim, Rahman; Stefani, Windy; Purba, Adi; Khollilurrahman, Kholillurrahman; Batubara, Ninda
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.v16i2.1945

Abstract

This study aims to compare the performance of two injection molding designs—Design A and Design B—for producing plastic hardness test specimens. Design A showed a fill time of 1.03 s and cooling quality covering 84.2% of the part, compared to 1.06 s and 72.4% for Design B. Design B, however, exhibited deflection of 0.96 mm versus 1.15 mm for Design A, and a maximum sink mark depth of 0.5687 mm versus 0.5773 mm. These characteristics in Design B support dimensional stability and limit visible defects, making it suitable for fabrication. Optimization strategies, such as adjustments to packing pressure, gate location, and the cooling system, are proposed to improve Design B's performance in terms of production efficiency and quality. The results indicate that, despite advantages in Design A, Design B offers a viable option for large-scale injection molding, balancing quality and operational efficiency.
FUEL-INJECTED MOTORCYCLE PERFORMANCE OPTIMIZATION UTILISING PERTALITE-ETHANOL BLENDS AND DEEP NEURAL NETWORK-BASED ECU FOR EFFICIENCY IMPROVEMENT AND EMISSION REDUCTION Yunus, La Ode Ichlas Syahrullah; Putri, Farika Tono; Ismail, Rima Ruktiari
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.v16i2.1946

Abstract

This study aims to optimize the performance of fuel-injected motorcycles through the application of a Deep Neural Network (DNN) in the Electronic Control Unit (ECU) and the use of ethanol-pertalite fuel blends. The ethanol blends used in the study were 0%, 5%, 10%, 15%, and 20%. Fuel consumption tests were conducted using the standard ECE/324 driving cycle, and emission tests were performed according to Euro 4 standards. Tests were conducted on a real track to evaluate fuel consumption performance and exhaust gas emissions. The results indicate that the 15% ethanol blend (E15) provided optimal engine efficiency, while the 20% ethanol blend (E20) resulted in the largest reduction in carbon monoxide (CO) and hydrocarbon (HC) emissions. Furthermore, the DNN model with 50 neurons and a Sigmoid activation function demonstrated the best balance between accuracy (R=0.9868) and generalization (MSE=0.3843) in optimizing ignition timing and injection timing. In conclusion, the ethanol blends and the application of DNN in the ECU have proven effective in enhancing fuel efficiency and reducing exhaust emissions, supporting the development of more sustainable transportation technologies.
ANALYSIS OF THE CUTTING BLADE FOR HDPE AND PET PLASTIC BOTTLE SHREDDERS FOR 3D PRINTING FILAMENT EXTRUSION Adhiharto, Riky; Mandayusdi , Cahya Ramdan Putra; Rahmi, Meri
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.v16i2.1950

Abstract

The increasing use of filaments for 3D printing encourages the use of suitable plastic waste as a raw material for filaments. In Indonesia, plastic waste will reach 26.2 million tons in 2023, with 18.47% of it being plastic. To process plastic waste such as PET (Polyethylene Terephthalate) and HDPE (High Density Polyethylene) into filaments, maximum size of shredding is 2 mm. This study aims to design a plastic shredding machine using the VDI 2222 (Verein Deutscher Ingenieure) method. This machine is powered by an AC electric motor that rotates a pulley to drive the blade, using a shredder and granulator cutting type. This machine is expected to be able to shred PET and HDPE plastic with a thickness of 0.3–2 mm. The results of the study are in the form of a plastic shredding machine design with dimensions of 1682 x 898 x 791 mm.
DESIGN AND PERFORMANCE OF A 300-WATT HELICAL TYPE H-ROTOR WIND TURBINE Kurniawati, Diniar Mungil; Farhan, Alfandy Muhammad; Am, Chaerul Qalbi; Gunawan, Gad; Giyantara, Andhika
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.v16i2.1983

Abstract

The Helical Type H-rotor turbine is a modification of the Darrieus turbine by Alexander Gorlov to improve the design of the H-Darrieus so the turbine can self-starting in low wind speed conditions. The purpose of this study is to analyze the pitch angle (5°, 0°, and -5°) when using the symmetrical airfoil (NACA 0018) on the performance of coefficient of power (CP), tip speed ratio (TSR) and coefficient of torque (CT) produced by Helical Type H-rotor turbine. The method used in this research is experimental investigation using wind tunnel.  The Helical Type H-rotor wind turbine is subjected to wind speed of 6 m/s. The results obtained show that the use of 0° pitch angle produces better CP, TSR and CT values than other pitch angles due to the angle of attack produced. this is due to the 0° pitch angle produces an angle of attack that is able to make a more optimal lift force on the turbine blade. At 0° pitch angle the CP value is 0.0337, TSR value is 1.5073 and CT value is 0.0224. While wind turbine that use -5° pitch angle produce better performance than wind turbine that use 5° pitch angle. However, the performance value of both (-5° and 5° pitch angle) is still below the wind turbine with 0° pitch angle.
CHARACTERIZATION OF SPECIFIC HEAT CAPACITY OF WATER-ALUMINUM OXIDE-BASED NANOFLUIDS Waluyo, Roy; Deendarlianto, Deendarlianto; Indarto, Indarto; Yuliaji, Dwi; Kharisma, Sunandi; Maryadi , Shendy Akbar; Oktaviandi, Ryan; Juarsa, Mulya
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.v16i2.2003

Abstract

Since the advent of nanofluids, engineers have expected major gains in thermal‐system efficiency. Yet a key property—specific heat capacity (Cp)—remains poorly understood, because Cp is not a single value but a spectrum governed by nanoparticle size, shape, material, and concentration. Deeper insight is essential, especially for natural‑circulation experiments that rely on accurately characterized working fluids. This study targets that gap by measuring the Cp of Al₂O₃–water nanofluids at mass fractions of 0.1, 0.2, and 0.3 wt%. Thirty-nanometer Al₂O₃ particles were dispersed in deionized water using magnetic stirring and ultrasonic processing. The nanofluid was heated in a thermostatic bath while temperature rise was tracked with thermocouples and a data‑acquisition system. Results reveal that relative Cp decreases as nanoparticle concentration increases and is also sensitive to fluid temperature. These findings clarify how concentration and temperature jointly shape the thermal behavior of Al₂O₃ nanofluids, guiding for design high‑performance natural‑circulation loops and other heat‑transfer applications.
ULTIMATE TENSILE STRENGTH ANALYSIS OF AN EPOXY COMPOSITE WITH PALM FIBERS AND ARECA CATECHU FIBERS Lubis, Gita Suryani; Tedi, Tedi; Noah, Muhammad Nouki; Noventa, Vinsen; Sajiwo, Tegar; Kamaludin, Muhammad Doni
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.v16i2.2047

Abstract

There are many types of reinforcement that can be used in the making of composites, and one of the more recent and popular ones is fiber-reinforced polymer. There are many types of fibers that can be used for the composite; this experiment will focus on natural fibers, specifically palm branch fiber and Areca catechu trunk fiber (Known locally in Indonesia as Pinang) with epoxy as its matrix. The composite will be constructed with different parameters, such as different NaOH treatment time (1,2, and 3 hours), pinang: palm fiber composition (50:50, 30:70, and 70:30) and fiber orientation (Horizontal, Vertical, and Random). Through the tensile strength, it's been found that the average strength is 3.07 MPa, where the highest value is 4.04 MPa with the NaOH treatment time of 1 hour, pinang: palm fiber composition of 30:70, and fiber oriented vertically.
ANALYSIS OF THE THRUST ON PROPELLER SHAFT ANGLE ON FISHING VESSEL USING CFD Prasdika, Tegar Oki; Bahatmaka, Aldias; Andriano, Kriswanto
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.v16i2.2073

Abstract

Indonesian fishing vessels need a prime mover capable of propelling the vessel forward and backward. According to data from the Ministry of Maritime Affairs and Fisheries, many vessels in Indonesia are spread across various State Fisheries Management Areas of the Republic of Indonesia waters. Most of the ships are in the State Fisheries Management Area of the Republic of Indonesia, 712 area, from a total of 4,989 vessels found in the area. This study aims to determine the thrust and torque values generated from the propeller using Ansys CFD (Computational Fluid Dynamics) software to determine the thrust force on the ship. The method used is the operation of the Ansys Fluent program on a computing device to calculate and simulate the effect of thrust on the propeller against the tilt angle of the shafts at 0°, 5°, 10°, 20°, 30°, 40°, 50°, and 60°. Before simulating, a validation process has been performed with an error below 5% in straight conditions without tilt. The results show propellers with various shaft angles have different thrust and torque values. In the simulation of a 50° tilt angle, the thrust value is 55809 N and the torque is 7211.15 Nm, while at a 60° tilt angle, the thrust value is 54582.4 N and the torque is 6193.81 Nm. Therefore, the propeller tilt position of 50° has the appropriate thrust and torque and can produce the optimal thrust force compared to other angles.
FITNESS FOR SERVICE OF GAS COMPRESSOR PIPING USING FINITE ELEMENT METHOD Ichsanudin, Muhammad; Prabowo, Imam; Istiqomah, Intan
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.v16i2.2093

Abstract

This research presents a Level 3 Fitness for Service (FFS) analysis, focusing on stress evaluation in the suction side of gas compressor piping in a gas-fired power plant in Indonesia, using the Finite Element Method (FEM). To expedite numerical calculations and reduce computational time, the analysis employs line elements within FEM, enabling efficient and timely assessment. The modeled operational conditions include sustained, expansion, and occasional seismic loads, providing a comprehensive view of pipeline behavior under various stress scenarios. The study results indicate that all pipeline segments analyzed show no potential for failure, with code ratios below 1. The sustained load has a code ratio of 0.71 with a maximum stress of 97.64 MPa, an expansion load of 0.66 with a maximum stress of 136.90 MPa, and an occasional seismic load, the highest at 0.70 with a maximum stress of 129.27 MPa. Among all loading scenarios, the compressor suction segment exhibits the highest code ratio, indicating the need for heightened attention in maintenance management. It is recommended that condition monitoring and inspection efforts be focused on this segment to prevent potential failure. The findings conclude that all code ratios from each loading scenario are acceptable, confirming that the pipeline segments meet the required safety standards. This reinforces the reliability of the pipeline system and validates the effectiveness of Level 3 FFS analysis in guiding maintenance strategies and risk management for critical gas pipeline systems.
WHY NOTCH GEOMETRY MATTERS FOR STRUCTURAL AND AUTOMOTIVE APPLICATIONS: A NUMERICAL SIMULATION Muflikhun, Muhammad Akhsin; Putro, Ardi Jati Nugroho; Chua, Alvin Y.; Santos, Gil Nonato C.
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.v16i2.2095

Abstract

In structural and automotive systems, notches—whether from manufacturing defects or in-service damage—often act as critical stress concentrators that compromise component integrity. This study provides a comprehensive simulation-based assessment of how different notch geometries affect the mechanical behavior of cold-rolled SPCC steel under tensile loading. Seven U-shaped notch variants were modeled according to ASTM E8M standards and evaluated using finite element analysis to determine von Mises stress, safety factor, and displacement patterns across five key regions. The findings reveal a clear correlation between notch diameter and failure risk: specimens with smaller notches (≤1 mm) exhibited von Mises stress exceeding 700 MPa and safety factors as low as 0.32, indicating early failure potential, whereas larger notches (≥6 mm) maintained stress levels below 250 MPa and safety factors above 1.0. This research offers practical design insights for engineers working with SPCC in automotive brackets, chassis, and thin-walled enclosures—highlighting the importance of avoiding sharp or undersized notches. The results support safer, more efficient design practices by providing predictive benchmarks and visual references that can aid in optimizing structural performance during early-stage development or finite element validation.

Page 72 of 97 | Total Record : 965

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