cover
Article Per Year (5 Year)
All
Home Page
OAI Link
Editorial Team
Contact
Reviewer
Google Scholar
Contact Name
-
Contact Email
-
Phone
-
Journal Mail Official
-
Editorial Address
Politeknik Negeri Semarang, Indonesia
Location
Kota semarang,
Jawa tengah
INDONESIA
Jurnal Rekayasa Mesin
Published by Politeknik Negeri Semarang
ISSN : 14116863     EISSN : 25407678     DOI : -
Core Subject : Engineering,
Mechanical Engineering
Rekayasa Mesin(d/h MANDEGANI) diterbitkan sejak 1997, dengan frekuensi 3 kali setahun. Misi : media komunikasi bagi dosen, praktisi, dan ilmuwan tentang karya ilmiah (scientific article) hasil-hasil penelitian, survei, studi kasus dan telaah pustaka yang erat hubungannya dengan teknik mesin, meliputi topik/tema seperti perancangan mesin, instalasi, perawatan & perbaikan mesin, bahan konstruksi & komponen mesin, teknik pengerjaan logam, pembuatan komponen mesi n, pengujian bahan dan komponen mesin, teknik pengukuran & kontrol kualitas proses/produk industri manufaktur, manajemen & teknik produksi industri manufaktur, pembentukan dan pengembangan desain produk, aplikasi komputer dalam sistem kendali & operasi mesin, mesin-mesin kalor & fluida, sistem pembangkitan energi, mesin pendingin & pengkondisian udara, pembangkitan energi alternatif & terbarukan.
Arjuna Subject : -
Articles 478 Documents
 44   45   46   47   48 
Corrosion Behavior of Al6061-T6 by GTAW with Different Filler Metals Suherman, Suherman; Muharnif; Lubis, Riadini Wanty; Irfansyah; F.X.A , Wahyudianto
Jurnal Rekayasa Mesin Vol. 20 No. 3 (2025): Volume 20, Nomor 3, Desember 2025
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v20i3.6496

Abstract

This study aims to compare the effect of filler metal of gas tungsten arc welding (GTAW) on the corrosion rate of Al6061 alloy weld metals. Three different filler metals, ER4043, ER4047, and ER5356, were used in the GTAW welding process. The corrosion rate characteristics of butt weld joints were studied using potentiodynamic testing in a 3.5% NaCl solution. The microstructure of the corroded weld metal was analyzed using Scanning Electron Microscopy (SEM). Results showed that filler metals affect the corrosion resistance of weld metal. It was found that ER4043 and ER4047 are more susceptible to corrosion, while ER5356 shows good corrosion resistance compared to the other filler metals. SEM observations revealed that dominant pitting corrosion was found in all welded joints and the base metal, with pit diameters ranging from 10 to 60 μm. Moreover, it was found that the Heat-Affected Zone was more susceptible to corrosion compared to the weld metal zone. Finally, welding of Al6061 using ER5356 filler metal is more recommended due to its superior resistance to pitting corrosion compared to the other types of joints.
Analysis of Sawdust and Coal Biomass Fuel Variations on the Efficiency of 660 MW Multistage Turbine Steam Power Plant Mokh Ausin Al Qoroni; Issafira, Radissa Dzaky; Rizki, Muhammad Daru Fatkhur; Wardana, Vrischo Candra Kumara
Jurnal Rekayasa Mesin Vol. 20 No. 3 (2025): Volume 20, Nomor 3, Desember 2025
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v20i3.6549

Abstract

The use of biomass as an alternative fuel in power generation systems is an important strategy in supporting the clean energy transition. This study analyzes the effect of variations in the mixture of biomass fuel in the form of sawdust with coal on the efficiency of a 660 MW multistage turbine in a Steam Power Plant (PLTU). The study was conducted experimentally with six variations of sawdust mixture from 0% to 5%. Data were obtained from direct observation and secondary data, then analyzed quantitatively using calculations of isentropic efficiency, turbine power, turbine heat rate, thermal efficiency, and exhaust emissions. The results showed that increasing the percentage of sawdust caused a decrease in the isentropic efficiency of the three types of turbines, namely High Pressure Turbine (HPT) from 85.90% to 83.20%, Intermediate Pressure Turbine (IPT) 98.01% to 96.89%, and Low Pressure Turbine (LPT) from 88.64% to 88.03%, output power from 639.150 MW to 603.525 MW, and thermal efficiency from 45.16%. to 44.04%, as well as an increase in turbine heat rate from 7971.761 kJ/kWh to 8174.373 kJ/kWh. However, flue gas emissions decreased significantly such as SO₂ from 354.898 mg/Nm³ to 11.507 mg/Nm³ and NOₓ from 220.549 mg/Nm³ to 140.324 mg/Nm³, while CO₂ remained relatively stable. The decrease in efficiency is due to the characteristics of sawdust, which has a lower heating value and higher moisture content than coal.
Design and Performance Testing of a Keychain Product Mold for a Learning Module in the Metrology and Plastic Moulding Laboratory at XYZ Anggit Kristiawan, Timotius; Setiyawan, Trio; Tono Putri, Farika; Ayu Janitra, Atikah; Syukur Alfauzi, Abdul; Mujiarto, Iman; Ningtias, Dieta Wahyu Asry
Jurnal Rekayasa Mesin Vol. 20 No. 3 (2025): Volume 20, Nomor 3, Desember 2025
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v20i3.6563

Abstract

In the current technological era, plastic assumes a crucial role in daily life. This is substantiated by the continuously escalating demand for plastic-based products. Manufacturing items by reshaping plastic raw materials necessitates the use of plastic forming tools or machinery. A prevalently utilized apparatus is the injection molding machine, which employs a specialized mold. The mold design process mandates rigorous calculations and planning to ensure the production of dimensionally identical and uniform parts, thereby facilitating mass production. The primary objective of this research was to design, implement, and validate a mold for plastic injection molding, specifically intended for the mass production of keychains. The methodology employed was the Sighley's Mechanical Engineering Design approach, which encompasses the following sequential procedures: Problem Identification, Problem Definition, Synthesis, Analysis and Optimization, Evaluation, and Presentation. The fabricated keychain mold yielded two products per injection cycle, with mold dimensions (L×W×H) measuring 110 mm×100 mm×160 mm. The mold was mounted on the injection molding machine, requiring a clamping force of 46710 N, with system control provided by an Arduino and cooling facilitated by an external fan. The test results identified the optimal operating parameters for a single molding process, comprising a heating temperature of 210°C, an injection time of 17 seconds, and a cooling time of 12 seconds.
Optimization of Manufacturing Parameters for Below-Knee Prosthetic Sockets Based on 3D Printing Using the Taguchi Method Pilargenta , Higan; Lestari, Wahyu Dwi
Jurnal Rekayasa Mesin Vol. 20 No. 3 (2025): Volume 20, Nomor 3, Desember 2025
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v20i3.6565

Abstract

Fused Deposition Modeling (FDM) technology is widely applied in the fabrication of transtibial prosthetic sockets due to its operational simplicity and high design flexibility. However, prolonged printing time remains a major constraint in improving production efficiency for clinical and industrial applications. This study aims to optimize the printing time of transtibial prosthetic sockets by adjusting three process parameters: socket wall thickness (1, 2, and 3 mm), thermoplastic filament type (PLA, ABS, and PP), and nozzle diameter (0.4 mm, 0.6 mm, and 0.8 mm). The Taguchi method with an L9 orthogonal array was employed as the experimental design. All specimens were fabricated using a Flashforge Guider II Series printer, and the printing time was evaluated using the Signal to Noise (S/N) ratio with the “smaller is better” criterion and analysis of variance (ANOVA) at a significance level of α = 0.05. The results indicate that nozzle diameter has the most significant effect on printing time, contributing 55.40%, followed by wall thickness at 39.51%, while material type contributes only 1.24% and is not statistically significant. The optimal parameter combination 1 mm wall thickness, PLA filament, and a 0.8 mm nozzle diameter reduced the average printing time by 24%, with a coefficient of variation below 5%. Confirmation tests yielded a validation S/N ratio of −64.58 dB, confirming the stability of the printing process. These findings provide practical guidance for accelerating the production rate of FDM based prosthetic sockets and suggest further research focusing on mechanical performance evaluation, infill pattern variation, and multi objective optimization.
Effect of Magnesium Variation on Microstructure and Mechanical Properties of Aluminum Recycled Alloys Muliastri, Destri; Ruardhian, Mahir; Azmy, Ilham
Jurnal Rekayasa Mesin Vol. 20 No. 3 (2025): Volume 20, Nomor 3, Desember 2025
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v20i3.6664

Abstract

The use of recycled aluminum (scrap) as a lightweight material in the automotive industry continues to grow, especially through the addition of magnesium elements to improve mechanical properties. This study analyzes the effect of adding magnesium of 5 Wt% and 10 Wt% on the mechanical properties and microstructure of aluminum scrap melting results using the sand casting method at a temperature of 707°C. The test results show that the addition of magnesium increases the hardness from 39.4 HV to 94.6 HV, and the tensile strength from 49.5 MPa to 181.5 MPa. Microstructural analysis shows the formation of more Mg phases in the aluminum matrix, resulting in a stronger and more homogeneous structure. The addition of 10 Wt% magnesium gives the most optimal results, proving that recycled aluminum has great potential to be used as a high-value engineering material through an alloying process.
Effect of Build Plate Material and Temperature on Adhesion Performance in Fused Filament Fabrication of HIPS and PP Bondan Wiratmoko Budi Santoso; Andreas Sugijopranoto; Budi Arifvianto; Muslim Mahardika; Th. Adi Nugroho; Paulus Wisnu Anggoro
Jurnal Rekayasa Mesin Vol. 20 No. 3 (2025): Volume 20, Nomor 3, Desember 2025
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v20i3.6716

Abstract

Adhesion between the printed part and the buildplate was a critical factor governing process stability, dimensional accuracy, and failure prevention in fused filament fabrication (FFF) technology. This study aimed to investigate the effects of build plate material and build plate temperature on interlayer adhesion performance and build-plate adhesion of high-impact polystyrene (HIPS) and polypropylene (PP). The research method used was an experimental approach involving the fabrication of standardized specimens using an FFF-based 3D printer, evaluation of interlayer bonding through tensile testing in accordance with ISO 527-3, and measurement of build-plate adhesion using a specially designed detachment test apparatus integrated with a universal testing machine, complemented by fracture morphology analysis using scanning electron microscopy. The results showed that increasing build plate temperature significantly improved interlayer adhesion strength and fracture surface width in HIPS, particularly at temperatures approaching its glass transition temperature, indicating enhanced molecular diffusion and improved interfacial bonding quality, whereas PP exhibited poor adhesion performance on all tested build plate surfaces due to early warping and interfacial void formation. Optimal and stable build-plate adhesion was achieved only for the HIPS–PEI combination at a build plate temperature of 105 °C, while ultrabed and glass build plates did not demonstrate adequate adhesion performance. These findings confirmed the importance of compatibility between thermal conditions and build plate surface characteristics in FFF processes and highlighted the necessity of material modification or additional surface treatment to improve the printability of PP.
Utilization of Moringa Fruit Peel Waste and Sawdust as Hybrid Composite Boards with Polyester Resin Matrix Leto, Kristina Tresia; Jayadin; Ridwan, Mastura; Coa, Sri Astuti Rahman; Nisa, Kartini Rahman; Mujiburohman, Muhammad; Ismiralda, Ismiralda; Farizi, Zakaria Al
Jurnal Rekayasa Mesin Vol. 20 No. 3 (2025): Volume 20, Nomor 3, Desember 2025
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v20i3.6941

Abstract

Environmental damage, previously considered a local problem, has now developed into a global issue, with waste becoming an increasingly pressing issue, especially in developing countries. Inadequate waste management has the potential to cause serious impacts on environmental sustainability and human health. One type of waste that has not been optimally utilized is moringa fruit peel waste and wood sawdust. This waste often causes soil and air pollution because it is left to pile up and burned. Therefore, this study aims to develop a Hybrid composite that combines moringa fruit peel waste and wood sawdust as a reinforcing material, as well as to test the mechanical and physical properties of the resulting composite board. This study uses an experimental approach in the laboratory with variations in waste composition (15%: 5%: 80%), (20%: 10%: 70%), (25%: 15%: 60%) and a composite board thickness of 1 cm. Testing parameters include tensile tests, compression tests, and water absorption. The tensile test results show that the composition of 15% moringa fruit peel fiber and 5% wood sawdust produces the highest tensile strength of 13.622 Mpa. Compression tests showed that a composition of 20% moringa rind fiber and 10% sawdust produced the highest compressive strength of 25.527 MPa. Water absorption tests showed that a composition of 25% moringa rind fiber and 15% sawdust had the lowest, or optimal, water absorption of 1.8%.
Optimization of Spot Welding Parameters on Shear Tensile Strength of 0.9 mm SPCC Material using the Taguchi Methods Samodra, Yudha; Hutama, Adhi Setya; Kurniawan, Perwita; Hayu, Winastwan Sista; Nugroho, Th. Adi
Jurnal Rekayasa Mesin Vol. 20 No. 3 (2025): Volume 20, Nomor 3, Desember 2025
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v20i3.7032

Abstract

Resistance spot welding (RSW) is one of the most widely used joining methods for thin metal sheets in the manufacturing industry, particularly for low-carbon steel materials such as SPCC. At PT. XYZ, inconsistencies in weld quality have been observed due to the absence of optimized process parameters. This study aims to analyze the influence of spot welding parameters—welding current, welding time, and holding time—on the shear tensile strength of 0.9 mm SPCC material. The Taguchi method with an L9 orthogonal array experimental design was employed to identify the optimal parameter combination. Shear tensile testing was conducted in accordance with ISO 14273:2016, while data analysis was performed using the Signal-to-Noise (S/N) ratio with the "larger is better" criterion and Analysis of Variance (ANOVA).The results indicate that welding current is the most dominant factor, contributing 71.12% to the variation in shear tensile strength, followed by welding time at 21.11%, while holding time has a relatively minor contribution of 5.66%. The optimal condition was achieved at 34 kA (welding current), 15 cycles (welding time), and 10 cycles (holding time), yielding a maximum shear tensile strength of 572.06 kgf and an S/N ratio of 54.00 dB. This study demonstrates that the Taguchi method is effective for optimizing spot welding parameters with a minimal number of experiments, providing a reliable technical guideline to improve the quality and consistency of production processes in the manufacturing industry.
Two-Degree-of-Freedom Flow-Induced Vibrations of an Elastically-Mounted Cylinder under Oscillatory Flow: A Numerical Study Riadini, Elfrida Rizky; An-Nizhami, Avicenna; Yanuar, Padang; Yobioktabera, Amran; Lathief, Muttabik Fathul
Jurnal Rekayasa Mesin Vol. 20 No. 3 (2025): Volume 20, Nomor 3, Desember 2025
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v20i3.7102

Abstract

Flow-Induced Vibration (FIV) in oscillatory flow represents a complex fluid–structure interaction that remains insufficiently explored, particularly for two-degree-of-freedom (2-DoF) systems allowing coupled inline and cross-flow motion. Previous studies have primarily focused on steady flows or limited parameter ranges, leaving a significant knowledge gap in understanding dynamic responses influenced by both reduced velocity ( ) and Keulegan–Carpenter (KC) numbers. This study aims to numerically investigate the vibration characteristics of a 2-DoF circular cylinder subjected to oscillatory flow, emphasizing the coupling mechanism between the two motion directions under varying  and KC values. The research employed a numerical approach based on the Direct Forcing Immersed Boundary (DFIB) method integrated with Navier–Stokes solvers and structural motion equations. Simulations were conducted for KC values of 5–20 and  ranges between 5–35. The temporal integration was performed using the third-order Adams–Bashforth schemes to ensure accuracy and stability. The results reveal that lock-in phenomena occur within specific UR ranges for each KC value, with resonance peaks identified at  = 5 for KC = 5,  = 10 for KC = 10,  = 15 for KC = 15, and  = 20 for KC = 20. Increasing KC values amplify the interaction between flow and structural responses, producing multi-mode vibrations and nonlinear coupling between inline and transverse motions. Furthermore, galloping phenomena were detected at higher UR, indicating a transition from vortex-induced vibration to hydrodynamic instability. These findings contribute to a deeper understanding of FIV dynamics in oscillatory environments, offering insights for optimizing offshore structure design and wave energy harvesting devices.
Analysis of the Effect of Adding Insulators to Reservoirs Tank on Heat Losses as a Result of the Heat Exchanger System (Double Tube) for Water Heater Nailul Atifah; Dian Wiranda Tahami; Astuti, Fifit
Jurnal Rekayasa Mesin Vol. 20 No. 3 (2025): Volume 20, Nomor 3, Desember 2025
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v20i3.7119

Abstract

Air Conditioners release heat to the environment through a condenser and contribute to global warming. This can be minimized by utilizing exhaust heat as a source of water heating energy. This study aims to determine the effect of adding insulators to reservoir tanks on the temperature of the water that has been heated. This research was carried out by installing a double tube heat exchanger between the  compressor and the condenser to transfer heat from the refrigerant of the air conditioner to the water. The volume of water used is 10 liters and 15 liters and the condition of the reservoir tank is insulated and the tank is uninsulated. The results showed that the water temperature in the reservoir tank fitted with an Armaflex insulator was 63.4oC at a water volume of 10 L and 60.3oC at a water volume of 15 L while the water temperature in a reservoir tank without an insulator was 57.7oC at a water volume of 10 L and 52.3oC at a water volume of 15 L. The heat loss of conduction in the insulated reservoir tank at the 50th minute was 3.94 kJ for a volume of water of 10 L and 3.70 kJ for a volume of water 15 liters, while the heat loss of conduction in a reservoir tank without an insulator is 2,404.46 kJ for a volume of 10 liters of water and 2,129.66 kJ for a volume of 15 liters of water. The use of Armaflex insulators in reservoir tanks results in thermal efficiency of more than 95% for 10 liter and 15 liter water volumes, but as the water temperature increases to the 50th minute, the efficiency decreases but is still above 95%. Meanwhile, the uninsulated reservoir tank provides a much lower thermal efficiency, which is 27.22% and 25.57% for the water volume of 10 liters and 15 liters respectively in the first 5 minutes of air conditioning operation, and continues to decrease to 1.88% and 2.30% in the 50th minute. This shows that the use of Armaflex insulators in reservoir tanks exhibits higher water temperatures, has a very significant effect in reducing heat loss to the environment, and higher thermal efficiency than non-insulated reservoir tanks.

Page 47 of 48 | Total Record : 478

 44   45   46   47   48 

Filter by Year

2012 2025


Reset
Filter By Issues
All Issue Vol. 20 No. 3 (2025): Volume 20, Nomor 3, Desember 2025 Vol. 20 No. 2 (2025): Volume 20, Nomor 2, Agustus 2025 Vol. 20 No. 1 (2025): Volume 20, Nomor 1, April 2025 Vol. 19 No. 3 (2024): Volume 19, Nomor 3, Desember 2024 Vol. 19 No. 2 (2024): Volume 19, Nomor 2, Agustus 2024 Vol. 19 No. 1 (2024): Volume 19, Nomor 1, April 2024 Vol. 18 No. 3 (2023): Volume 18, Nomor 3, Desember 2023 Vol 18, No 2 (2023): Volume 18, Nomor 2, Agustus 2023 Vol 18, No 1 (2023): Volume 18, Nomor 1, April 2023 Vol 17, No 3 (2022): Volume 17, Nomor 3, Desember 2022 Vol 17, No 2 (2022): Volume 17, Nomor 2, Agustus 2022 Vol 17, No 1 (2022): Volume 17, Nomor 1, April 2022 Vol 16, No 3 (2021): Volume 16, Nomor 3, Desember 2021 Vol 16, No 2 (2021): Volume 16, Nomor 2, Agustus 2021 Vol 16, No 1 (2021): Volume 16, Nomor 1, April 2021 Vol 15, No 3 (2020): Volume 15, Nomor 3, Desember 2020 Vol 15, No 2 (2020): Volume 15, Nomor 2, Agustus 2020 Vol 15, No 1 (2020): Volume 15, Nomor 1, April 2020 Vol 14, No 3 (2019): Volume 14, Nomor 3, Desember 2019 Vol 14, No 2 (2019): Volume 14, Nomor 2, Agustus 2019 Vol 14, No 1 (2019): Volume 14, Nomor 1, April 2019 Vol 13, No 3 (2018): Volume 13, Nomor 3, Desember 2018 Vol 13, No 2 (2018): Volume 13, Nomor 2, Agustus 2018 Vol 13, No 1 (2018): Volume 13, Nomor 1, April 2018 Vol 12, No 3 (2017): Volume 12, Nomor 3, Desember 2017 Vol 12, No 2 (2017): Volume 12, Nomor 2, Agustus 2017 Vol 12, No 1 (2017): Volume 12, Nomor 1, April 2017 Vol 12, No 2 (2017): Agustus 2017 Vol 11, No 3 (2016): Volume 11, Nomor 3, Desember 2016 Vol 11, No 2 (2016): Volume 11, Nomor 2, Agustus 2016 Vol 11, No 1 (2016): Volume 11, Nomor 1, April 2016 Vol 10, No 3 (2015): Volume 10, Nomor 3, Desember 2015 Vol 10, No 2 (2015): Volume 10, Nomor 2, Agustus 2015 Vol 10, No 1 (2015): Volume 10, Nomor 1, April 2015 Vol 10, No 1 (2015) Vol 9, No 3 (2014): Volume 9, Nomor 3, Desember 2014 Vol 9, No 2 (2014): Volume 9, Nomor 2, Agustus 2014 Vol 9, No 1 (2014): Volume 9, Nomor 1, April 2014 Vol 8, No 2 (2013): Volume 8, Nomor 2, Agustus 2013 Vol 8, No 1 (2013): Volume 8, Nomor 1, April 2013 Vol 7, No 3 (2012): Volume 7, Nomor 3, Desember 2012 More Issue