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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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OPTIMIZATION OF LIGHTWEIGHT ELECTRIC BUS FRAME DESIGN THROUGH VALUE ENGINEERING APPROACH: A SYSTEMATIC REVIEW AND PARAMETRIC FEASIBILITY ANALYSIS Artana, I Nyoman; Sumarsono, Danardono Agus; Huda, Mahfudz Al; Adhitya, Mohammad
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.v16i2.2119

Abstract

Lightweight frame design plays a critical role in improving the efficiency and sustainability of electric buses. This study aims to explore the optimization of electric bus frame design through the application of Value Engineering (VE), using a systematic literature review (SLR) supported by technical simulation references. The review focused on key parameters, including material selection, structural topology, component dimensions, and production costs, analyzed across more than 40 publications from reputable databases over the past decade. Various studies demonstrate that substituting conventional steel with aluminum alloy 6063 can reduce frame weight by up to 30%, while topology optimization based on Finite Element Analysis (FEA) achieves more efficient load distribution and structural integrity.  Additionally, shifting from manual to robotic welding methods has shown to enhance production efficiency by approximately 20%. Despite higher initial costs, VE supports long-term benefits by reducing operational costs, improving energy consumption, and aligning with sustainability goals. The findings suggest that integrating VE into the early stages of electric bus frame design offers a strategic pathway toward lighter, safer, and more cost-effective transportation solutions.
THE EFFECT OF HOLDING TIME VARIATIONS IN THE AUSTENITIZATION AND SPHEROIDIZING ANNEALING PROCESSES ON THE MECHANICAL PROPERTIES AND MICROSTRUCTURE OF 304 STAINLESS STEEL THIN FOIL Aziz, Abdul
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.v16i2.2132

Abstract

This study discusses the effect of holding time variations in the austenitization and spheroidizing annealing processes on the mechanical properties (hardness and tensile strength) and microstructure of 304 thin foil stainless steel materials. The austenitization process was carried out at a temperature of 900°C using holding time variations of 20, 40 and 60 minutes, followed using water. Furthermore, the spheroidizing annealing process was carried out at a temperature of 810°C with holding time variations of 200, 220 and 240 minutes and continued with tempering at a temperature of 400°C with a holding time of 60 minutes on all samples. The analysis includes hardness testing, tensile testing and microstructure observation using an optical microscope. The test results show that increasing the holding time during austenitization increases the homogeneity of austenite but can cause excessive grain growth. In contrast, the spheroidizing annealing process produces a more uniform distribution of spherical carbides and increases the ductility of the material. Then the phase formed as a result of the heat treatment process is the austenite phase as the main phase and there is martensite. Thus, this study contributes to understanding the relationship between heat treatment parameters such as holding time and mechanical properties of the material.
CHARACTERISTICS OF COMBUSTION AND PHYSICAL PROPERTIES OF COFFEE GROUNDS AND SAGO PULP BRICKS WITH SAGO FLOUR BINDER Haurissa, Calvion Jean; Joni, Joni; Ranteallo, Obet Takke; Numberi, Johni J; Palamba, Phiter; Karapa, Enos; Haurissa, Jusuf
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.v16i2.2139

Abstract

This study examines the production of briquettes based on agricultural waste from sago pulp and coffee grounds using natural sago flour as a binder, through a laboratory experimental approach. The analysis covers the physical and chemical characteristics, as well as the thermal performance of 3 cm cube-shaped briquettes. The results show that coffee pulp briquettes have the highest heat transfer rate (0.528 Watts) and the highest calorific value (5018 kcal/kg), indicating superior combustion efficiency compared to sago pulp briquettes (0.205 Watts; 4856 kcal/kg) and mixed briquettes (0.347 Watts; 4966 kcal/kg). These differences in characteristics were influenced by the composition of the materials, while the size of the briquettes affected the ignition time. Overall, all types of briquettes showed potential as an environmentally friendly alternative energy source based on local biomass.
VEHICLE STEERING CONTROL DESIGN BASED ON AN INTEGRATED DYNAMIC MODEL WITH ANTI-LOCK BRAKING SYSTEM AND ADAPTIVE AUTOMATIC CONTROL Wisnujati, Andika; Muzamil, Sanupal
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.v16i2.2157

Abstract

This research presents the design and development of a mathematical model for a vehicle steering system guided by the Antilock Braking System (ABS) with integrated automatic control. The purpose of this study is to enhance vehicle stability and steering performance, particularly under critical braking conditions where loss of traction and directional control commonly occur. The proposed model integrates ABS dynamics with an automatic steering control algorithm to simulate real-time responses of the vehicle under various road and driving scenarios. The mathematical formulation is based on vehicle kinematics and dynamics, incorporating nonlinear tire characteristics, braking force distribution, and steering angle adjustments. A control system utilizing PID (Proportional-Integral-Derivative) component is embedded into the model to optimize the coordination between braking and steering operations. Simulation results using MATLAB show that the integrated system significantly improves steering accuracy, reduces stopping distance, and maintains vehicle stability during sudden braking and turning maneuvers. The findings suggest that combining ABS with intelligent steering control contributes to safer driving, especially on slippery or uneven surfaces. This research serves as a foundational step toward the development of more advanced driver-assistance systems (ADAS) and contributes to the ongoing efforts in automotive safety engineering.
DIMENSIONAL ACCURACY OF 3D PRINTED DOG BONE STRUCTURES Nugroho, Wendy Triadji; Tyagita, Dicky Adi; Wahyudiono, Arif; Suranto, Dwi Djoko
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.v16i2.2158

Abstract

The current study provides a comprehensive discussion regarding statistical analysis of dimensional accuracy comprising thickness, gauge section width, circularity and cylindricity for 3D printed polylactic acid (PLA) specimens according to the dimensional specifications of ASTM D638 standard type IV, which are optimally built via fused deposition modelling (FDM). This work focuses on investigating the primary influences of 3D printing parameters as input factors consisting of nozzle temperature, infill density as well as layer height on dimensional deviation of the printed specimens. The confirmation tests are implemented in this study to ensure the experimental work's reproducibility. The resulting data shows that layer height dominates the effects, namely 80, 88, 81 and 81% on thickness, gauge section width, circularity and cylindricity. Meanwhile, nozzle temperature gives the second considerable influence on dimensional deviation of printed specimens, around 16, 9, 16 and 17%. Conversely, infill density promotes a negligible effect on the dimensional error of such specimens. Furthermore, the confirmation tests indicate that the experimental works are highly reproducible. These findings can contribute significantly to the additive manufacturing technology for PLA material, especially when the printed specimens are used for specific applications in biomedical, engineering and aerospace fields.
PERCENTAGE OF HOT MIX ASPHALT MODIFICATION WITH HDPE POLYMER AND SYNTHETIC RUBBER COMPOSITE COMPOSITION BASED ON MARSHALL IDENTIFICATION AND COMPRESSIVE TEST Junus, Stella; Renreng, Ilyas; Pratikto, Pratikto
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.v16i2.2189

Abstract

Hot Mix Asphalt is a combination of natural material composition with asphalt in the needs of highway infrastructure that is much needed. This study aims to identify the parameters of asphalt mixtures combined with HDPE type polymers and synthetic rubber in weight percentages of 4%, 5%, and 6% at temperature variations of 1700oC, 2000oC, and 2300oC which include density, Void Filled with Aspalt (VMA), Void in the mix (VIM), Void filled of Bitumen (VFB), Flow and Stability using Marshall tools, with the determination and orientation of loading carried out through a free pressure system or by Compressive Test to determine the fatique value in the loading process carried out. The optimum mixture rate is 5% with a temperature of 2000oC for HDPE type polymers, a mixture of 4% with a temperature of 2000oC for synthetic rubber mixtures, then for mixing both types of fillers the optimum mixing temperature is 1750oC, while the maximum loading value is located at 800 kN / cm2, the average load that can be received is 60 kN/s with cylindrical specimens with a height of 7 cm with a diameter of 10.5 cm.
SIMULATION OF MONOCOQUE CHASSIS STRUCTURE OF ELECTRIC VEHICLES BASED ON COMPOSITE MATERIALS Daryono, Daryono; Yusvana, Bima Fatureza; Saifullah, Ali
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.v16i2.2212

Abstract

The chassis is one of the main components in a prototype electric motor vehicle, serving as the structural support for the drivetrain, steering system, and driver safety. This study aims to design and simulate a monocoque composite chassis as an alternative to the conventional ladder frame. The methodology employed finite element analysis using Ansys Composite Pre-Post (ACP) to define ply details, orientation, and laminate thickness. The materials used were Epoxy Unidirectional Carbon Fiber, Epoxy Carbon Woven, and PVC Foam as the core. The simulation results indicate that the chassis experienced a maximum deformation of 0.8933 mm, a maximum principal stress of 34.53 MPa, and a maximum principal elastic strain of 0.001028 mm/mm. The composite failure criterion value of 0.2666 (< 1) shows that the structure remains in a safe condition. Furthermore, the monocoque design successfully reduced the mass by 3.1 kg compared to the previous chassis, supporting improved vehicle efficiency. Overall, this study demonstrates that the monocoque composite chassis design provides a better combination of strength, stiffness, and mass efficiency compared to the ladder frame and has strong potential for application in the development of prototype electric motor vehicles.
AIR CONDITIONING LOAD AND ANALYSIS CALCULATION OF AIR DISTRIBUTION IN VEHICLE CABINS BRIDGE MAINTENANCE INSPECTION Mulyono, Mulyono; Sadewa, Maulana; Soegiharto, Achmad Fauzan Hery; Restu, Firdausa Retnaning
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.v16i2.2217

Abstract

Cabin comfort is essential for an inspector to work focusly and produce valid data in a bridge maintenance vehicle. The use of an air conditioner (AC) in the cabin of this vehicle is a concern for the inspector's comfort while supervising the bridge. Choosing an inappropriate AC can result in excessive energy consumption or inadequate thermal comfort. Furthermore, the transparent windows and windshields of glass elevate the temperature and allow sunlight to invade the room. Consequently, it intensifies the cooling demand. Considering this situation, this study focuses on calculating the cooling load in the cabin and simulating the thermal performance using computational fluid dynamics (CFD). The simulations were conducted using Ansys 2023 software, with a runtime of 4 minutes and 2,400 iterations. It is to achieve a cabin temperature within the comfort range of 22–26°C. The cabin is designed for two inspectors. At an airflow velocity of 3 m/s, the simulation yielded a maximum temperature of 40°C and a minimum of 21.13°C. Reducing the airflow to 2 m/s resulted in a range of comfortable temperatures for the cabin. In conclusion, the simulation results fulfill the criteria and confirm that an airflow velocity of 2 m/s is sufficient to maintain the comfortable temperature in the cabin.
Hardening Baja AISI 1045 Menggunakan Gel Aloe Vera Sebagai Media Pendingin Budiyanto, Eko; Choiron, Moch. Agus; Darmadi, Djarot B.
Jurnal Rekayasa Mesin Vol. 7 No. 2 (2016)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jrm.2016.007.02.3

Abstract

Quenching is a cooling method of heat treatment for metal hardening. Quenching refers to the process of rapidly cooling metal parts from the austenitizing or solution treating temperature, typically from within the range of 815 to 970 °C for steel. The selection of a quenchant medium depends on the hardenability of the particular alloy, the section thickness and shape involved, and the cooling rates to achieve the desired microstructure. The liquid quenchants of oil is commonly used in industrial manufacture. But, oil is not environmental. The aim of this research research is to find new quenchant for change oil as quenchant to more environmental. Gel aloe vera is purposed for it. The material used in this study is AISI 1045 steel. Cooling curve and cooling rate is measured by finite element model, ANSYS APDL 14.5. True experimental is done to view microstructure and measure hardness of steel. Simulation result shown that gel aloe vera has almost similar cooling curve and cooling rate with oil. Microstructure result of steel for gel aloe vera as quenchant is martensite in surface, bainite in center, and pearlite in between surface and center. Hardness number of steel for gel aloe vera as quenchant is 189.63 HVN in surface, 182.566 HVN in center, and 162.866 HVN in between surface and center. By simulation and true experimental analisys concluded that gel aloe vera has opportunities to change oil as quenchant for hardening process.
PERBANDINGAN PENGGUNAAN KONDENSOR BERPENDINGIN UDARA DENGAN KONDENSOR BERPENDINGIN AIR PADA LEMARI PENDINGIN Korawan, Agus Dwi
Jurnal Rekayasa Mesin Vol. 15 No. 2 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i2.692

Abstract

Refrigerators are one of the common machines for Indonesian people. Refrigerators can be used to store foods and ingredients for longer shelf life. The temperature in the refrigerator and freezer is low because the heat is absorbed by the evaporator and then released into ambient air through the condenser. The heat transfer velocity from the condenser to ambient air depends on the convection heat transfer coefficient of air. This study was conducted experimentally by comparing the refrigerator's performance that use air-cooled condensers and water-cooled condensers. The equipment used is a refrigerator with a portable water bath. This study aims to know the temperature change speed in the storage room and freezer room, the temperature changes before and after the condenser was used, and the change of the temperature and pressure in refrigerant before and after the evaporator was used. The results showed refrigerator with a water-cooled condenser can give cooling process in the storage room faster, give freezing process in the freezer room faster, and enhance COP.

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