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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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Kota malang,
Jawa timur
INDONESIA
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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ANALYSIS OF TENSILE STRENGTH AND MACRO STRUCTURE OF 6061 ALUMINUM ALLOY RESULTING FROM GMAW AND GTAW WELDING Salahudin, Xander; Waluyo, Edi; Hastuti, Sri
Jurnal Rekayasa Mesin Vol. 16 No. 3 (2025)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/

Abstract

Aluminium 6061 material is often used in the shipbuilding industry, especially as a construction frame on ships. GMAW (Gas Metal Arc Welding) and GTAW (Gas Tungsten Arc Welding) are widely used in welding aluminium alloy materials. This research aims to determine and analyse the effect of V, X, and U groove variations welded using GMAW and GTAW on tensile strength of a 6061 aluminium alloy. The results of this study obtained the highest tensile stress value from the X groove GMAW welding of 149.22 MPa with a strain of 8.60%. The lowest tensile stress value was obtained from the U groove GTAW welding of 105.09 MPa with a strain of 3.18%. In general, the tensile strength value of GMAW welding is better than GTAW welding. Macro photo observations of GMAW welding show a small amount of porosity welding defects at the base of the weld, while GTAW welding shows a more amount of porosity welding defects at the base of the weld.
TECHNOLOGY FOR PLANNING THE MANUFACTURING PROCESS OF GUIDE VANES IN FRANCIS TURBINE HYDROELECTRIC POWER PLANTS Mauludin, Wandi; Hatta, Achmad
Jurnal Rekayasa Mesin Vol. 16 No. 3 (2025)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/

Abstract

PT XYZ is a company engaged in manufacturing, one of the products made is a Guide Vane for Hydroelectric Power Plants. The production process is carried out based on the terms of reference that has been made. The terms of reference do not have detailed information about the work steps, so that production activities are fully charged to the machine operator which has the potential for process errors and workpiece results. The way to improve the manufacturing process is to create process planning documentation, with the aim of simplifying the work process and calculating cost estimates. Documentation is made using the EMCO process planning method. Process planning is done on CNC milling machines and lathes. The results of the process planning made resulted in four processes with a total time of 2422,68 minutes. The process time obtained results in an estimated production cost of making a directional blade of Rp. 17.753.473,37 per piece.
DESIGN COOLING TOWER OF THE MECHANICAL DRAFT TYPE COUNTER FLOW TO ACHIEVE AMBIENT TEMPERATURE Setiawan, Angga Tegar; Fahrul, Fahrul; Arohman , Abdul Wahid; Anugrah , Fahmi
Jurnal Rekayasa Mesin Vol. 16 No. 3 (2025)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/

Abstract

The application of cooling towers in various industries has been widely used to meet needs. The main purpose of this study is to create an effective cooling tower in the water-cooling process by using the counter flow principle to meet the need to reduce the water temperature of the cooling system in transformers and holders of electric arc furnaces. The method used in the design and construction of the Cooling tower Mechanical draft Type Counter Flow tool includes the stages of planning, designing, making trials, and processing data. The planning stage involves gathering literature, searching for the best design, and determining the design plan. The design stage includes the design of the tool using Computer Aided Design (CAD) and the selection of materials to be used. The manufacturing stage involves assembling machine components into the desired design machine. Heat transfer analysis is also carried out to discover the heat transfer phenomenon. The test results show that the temperature data on the Thot, water cooling tower is 65,9 oC, Tcavity is 48 oC, Twater column is 28 oC, and Tcold is 26,8 oC. So that the design of the tool shows a decrease in temperature at each stage, including Tcavity is 21 oC, T water column is 20 oC, and T tank is 1,2 oC. The mini cooling tower achieved a high cooling range of 35,9 oC and a low approach of 3,2 oC. It can reduce the water temperature from the cooling process in the transformer and holder electric arc furnace. The design has released the hot water temperature from 65,9 oC to 26,8 oC. The design of the tool has succeeded in releasing heat as much as 61,4 kJ/s. Thus, the water from the cooling process can be effectively reused as a cooling medium, offering a practical and efficient solution for enhancing sustainability in small to medium-scale industrial cooling processes.
TEMPERATURE AND GEOMETRY ANALYSIS IN N-LAYER WIRE ARC ADDITIVE MANUFACTURING USING GMAW AND ER70S-6 FILLER Amat, Mohammad Azwar; Sifa, Agus; Luthfi, Muhammad; Novianto, Arif; Panjaitan, Daniel Leonardo
Jurnal Rekayasa Mesin Vol. 16 No. 3 (2025)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/

Abstract

WAAM products produce a relatively rough and less precise final surface. Therefore, this study investigated and analyzed the geometric dimensions of the product at each layer and cycle time to achieve N-layers with the aim of obtaining a baseline operational time and achieving WAAM dimensional accuracy of less than ±1 mm deviation. The dimensional measurement method was carried out using a Dinolite photograph, 3-D scanning, and vernier caliper. The cycle time or downtime during the WAAM process was 130 minutes for TS 200 mm/min. TS 200 produced the most consistent thickness with the lowest thickness standard deviation of ±0.49 mm, the highest material efficiency with 45.7% of the material becoming product, and 54.3% of the material being wasted. The product produced by TS 200 mm/min has dimensions of 85 × 4 × 20 mm³.
A COMPREHENSIVE REVIEW: EQUATIONS OF PIPE VIBRATION INDUCED BY INTERNAL FLUID FLOW Ferdian, Yadi; Suwondo, Edy
Jurnal Rekayasa Mesin Vol. 16 No. 3 (2025)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/

Abstract

Some researchers have developed analytical models for the vibration of pipe conveying fluid internal flow with many forms of equation for different behavior of vibration, boundary conditions and assumptions. To predict the behavior of vibration with different boundary conditions and assumptions, it is needed to separate the equations into linear and nonlinear terms. This research will define the behavior of the linear terms and nonlinear terms, then classify the equations based on the two categories of terms. The general case of vibration of pipe has been chosen based on industry applications. In general, for each of the cases the vibration of pipe conveying fluid has nonlinear terms due to some forces acting on the pipe, except flexural force, centrifugal force, Coriolis force and inertia force in the fluid and pipe.
FLOW MODELING IN SIDE CHANNEL SPILLWAYS USING THEORETICAL AND NUMERICAL METHODS BASED ON COMPUTATIONAL FLUID DYNAMICS Dhitaisma, Elsya; Dermawan, Very; Sisinggih, Dian
Jurnal Rekayasa Mesin Vol. 16 No. 3 (2025)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/

Abstract

The spillway is a critical structure in dam projects. Failure to manage extreme flood events, like the Probable Maximum Flood (QPMF), may cause overtopping and dam failure. This study examines the hydraulic characteristics of the Surumana Dam's side channel spillway in Central Sulawesi, Indonesia, using Computational Fluid Dynamics (CFD) through ANSYS FLUENT. Initial calibration is based on water surface elevation above the spillway, with a relative error below 5%, confirming the model's accuracy. For Q₁₀₀th, the flow corresponds to free flow, while for QPMF, it exhibits submerged flow, with no cavitation. The overall model performance is evaluated using the Brier-Skill Score (BSS), with scores of 0.812 for Q₁₀₀th (excellent) and 0.795 for QPMF (good) for water surface elevation. Similarly, flow velocity BSS scores are 0.923 for Q₁₀₀th and 0.823 for QPMF, both rated excellent. These results demonstrate that the CFD model reliably represents hydraulic behavior under various flow conditions.
ARDUINO-BASED AUTOMATIC CONTROL SYSTEM APPLICATION FOR DROPLET COMBUSTION HEATER DRIVE Issafira, Radissa Dzaky; Tasya, Nellysa Arviana; Rizqullah, Andre Rifqi; Hafizh, Rakha Abyan; Soegianto, Verio Rinaldo
Jurnal Rekayasa Mesin Vol. 16 No. 3 (2025)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/

Abstract

The droplet test in combustion is a widely used method for evaluating the physical properties of fuels, such as biodiesel. This examination entails depositing liquid droplets onto a surface and monitoring their properties. This study employs a semi-automatic control system in droplet testing to enhance the accuracy and efficiency of the process. The Arduino sensor system controls the heater-connected screwdriver by the droplet temperature. One button activates the Arduino sensor system to switch on and move the heater toward the droplet location. After the droplet turn into flame and shows its light intensity, the sensor captures the signals and the heater automatically reverses to maintain flame temperature. The comparison between droplet temperatures taken using manual and automatic methods were compared with 10 repetitions for each experiment. The results showed that automatic method has higher accuray result with average coefficient variation value of 4-9%, whereas the manual is 9-48%. This method is anticipated to improve the precision and efficacy of droplet testing to a fully automated control system.
THE EFFECT OF ADDING BIOETHANOL TO RON 92 GASOLINE ON PERFORMANCE AND EXHAUST EMISSIONS Sugati, Daru; Salim , Amat Agus; Abdulkadir, Muhammad; Efendi , Nizam
Jurnal Rekayasa Mesin Vol. 16 No. 3 (2025)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/

Abstract

Processing bioethanol from plants rich in carbohydrates into alternative energy sources is a challenging problem related to providing renewable energy. This paper discusses an experimental study of a spark ignition (SI) engine using a mixture of conventional RON 92 fuel mixed with bioethanol. The aim is to boost engine performance and exhaust emissions caused by bioethanol blended fuels (E5 and E10). An unmodified spark ignition (SI) engine and bioethanol distillation product from sugarcane molasses mixed with conventional RON 92 fuel were used to evaluate engine performance at engine speeds between 2000 and 8000 rpm. The investigation results showed that the mixture of E5 and E10 provided advantages because the oxygen content was higher, thus improving the combustion process. The torque and engine power produced increased by an average of 1.1% and 1.9%. Under the same combustion process conditions, BSFC fuel consumption also decreased by an average of 1% and 2.3%. The mixture of fuel with bioethanol sugarcane molasses can improve the combustion process because it contains a lot of oxygen (O2). The increase in torque and power produced by the engine is not too significant, but overall, it can reduce the content of exhaust emissions of carbon monoxide (CO), carbon dioxide (CO2), and hydrocarbons (HC).
EXPLORING BIDARA LEAVES AS A SUSTAINABLE CORROSION INHIBITOR FOR AISI 1045 STEEL IN 3,5% NACL SOLUTION Magga, Ramang; Tence, Tence; Zuchry, Muhammad; Marsan, Kennedy; Kali, Agustinus
Jurnal Rekayasa Mesin Vol. 16 No. 3 (2025)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/

Abstract

This research investigated the efficacy of bidara leaf extract (BLE) as a natural corrosion inhibitor for AISI 1045 steel in a 3.5% NaCl solution. Different concentrations of BLE (0%, 0.05%, 0.10%, and 0.15%) were examined by the immersion method, potentiodynamic polarization (PDP), and electrochemical impedance spectroscopy (EIS) to assess the corrosion rate and inhibition efficiency. The findings indicated that the minimal corrosion rate was seen at 0.15% BLE concentration. PDP study demonstrated a notable reduction in current density (icorr) as BLE concentration increased, signifying its efficacy in corrosion inhibition. The test findings indicated an elevation in charge transfer resistance, corroborating the establishment of a stable protective layer on the steel surface. SEM-EDX research further confirmed the existence of negligible surface damage and the adsorption of organic inhibitor layers. The active chemicals in BLE facilitated the passivation process, diminishing oxidation-reduction processes and decelerating the corrosion rate. The findings affirm that bidara leaf extract is a viable eco-friendly alternative as a natural inhibitor to mitigate corrosion and offer sustainable protection for low-carbon steel in NaCl.
COMPARATIVE STUDY OF HYPERELASTIC MODELS FOR THERMOPLASTIC ELASTOMERS IN SOFT ROBOTICS Saduk , Melsiani R F; Hattu, Edwin P D; Wabang , Jhon A; Hore , Duran; Nasaruddin, Nasaruddin; Pangalinan, Antonius Pangalinan
Jurnal Rekayasa Mesin Vol. 16 No. 3 (2025)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/

Abstract

The accurate prediction of mechanical behavior in thermoplastic elastomers (TPEs) is essential for improving the performance of soft robotic grippers. This study presents a comparative evaluation of three hyperelastic models—Neo-Hookean, second-order Yeoh, and first-order Ogden—applied to NinjaFlex (TPU), Filaflex (TPE), and Pebax (PEBA). Finite Element Analysis (FEA) was conducted in ANSYS to assess total deformation, equivalent strain, and von Mises stress under internal pressures of 0.08–0.30 MPa. The Yeoh model captured the large-strain behavior in flexible materials, while the Ogden model provided balanced predictions across various stiffness levels. Neo-Hookean served as a computationally efficient baseline but showed limited accuracy under high strain. These findings provide a simulation-based framework for material–model selection in soft robotics and highlight the importance of model–material compatibility in design.

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