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IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA)
Published by CV. IRA PUBLISHING
ISSN : -     EISSN : 29624290     DOI : https://doi.org/10.56862/irajtma
Core Subject : Science, Engineering,
Automotive Engineering Energy Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering
IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) fokus pada artikel ilmiah hasil penelitian dan review dalam bidang teknik mesin dan aplikasinya yang antara lain meliputi: 1. Konversi energi 2. Mekanika 3. Material 4. Manufaktur 5. Lain-lain yang relevan
Arjuna Subject : Teknik (semua kategori) - Teknik Mesin
Articles 257 Documents
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Rancang Bangun Teknologi Smart Mixing Ice Cream Gelato untuk Pengembangan Bisnis UMKM Kekinian Widiyanti Widiyanti; Riana Nurmalasari; Marji Marji; Tuwoso Tuwoso; Sh Mohd Firdaus Sh Abdul Nasir
IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) Vol 4 No 3 (2025): Desember
Publisher : CV. IRA PUBLISHING

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56862/irajtma.v4i3.340

Abstract

Gelato has become a trendy dessert, gaining popularity in the market. However, few UMKM are involved in making contemporary gelato. One reason is the high cost of equipment and the need for special techniques. The success of a gelato product is largely determined by the dough used. Given this situation, UMKM should start using technology to produce gelato dough with higher quality and consistency. The design method for creating gelato dough mixer technology that meets UMKM needs includes problem identification, field studies, design, prototyping, assembly, and analysis. This technology is expected to create an effective, efficient, and high-quality production process. This technology serves not only for stirring but also as a chopper for fruit or other gelato ingredients. This gelato dough mixer technology chops the gelato topping ingredients, which then automatically fall into the gelato mixing chamber and are churned into gelato. The mixing chamber can accommodate a single production process of 30 kg. After mixing is complete, the gelato is removed from the mixing tube through the provided channel, and the results are stored in a container so the packing process can continue.
Optimasi Persediaan untuk Ketersediaan Perkakas Kerja di Bengkel Otomotif Hariyo P. S. Pratomo; Ivan Christian Hernando; Matthew Jeffrey Rudijanto; Joseph Wicaksono Tandio
IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) Vol 4 No 3 (2025): Desember
Publisher : CV. IRA PUBLISHING

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56862/irajtma.v4i3.342

Abstract

Automotive workshops commonly face inefficiencies in special-tool availability due to manual and non-transparent tracking systems. This study addresses this challenge by examining the impact of limited tool quantities on operational performance, particularly the low average service level (86.18% vs. the 95% target). This study is among the first to integrate a digital tool management system with quantitative inventory-optimization methods, i.e., Safety Stock and Cost-Benefit Analysis (CBA), in an automotive workshop context. Borrowing-transaction records collected over 60 days were analyzed to identify critical tools with the highest demand variability. Although most tools achieved full availability, 15 high-demand tools contributed to reduced overall service level and were therefore prioritized in the optimization process. Application of Safety Stock analysis recommended ideal inventory quantities, while CBA revealed diminishing-return thresholds, preventing unnecessary investment. Key improvements include increasing service level from 71.27% to 99.51% and enhancing cost efficiency to 89.04%. The combined digital recording system and quantitative optimization framework have proved highly effective in improving tool availability and reducing operational costs. This approach offers a scalable model for automotive workshops seeking to enhance efficiency and sustainability through data-driven tool-management strategies.
Analisis Akurasi Dimensi Prototipe Cetakan Cutting Tools Insert Tri Angle Menggunakan Proses Pencetakan 3D Berbahan PETG Muhammad Sobron Yamin Lubis; Raylan Alexander; Gerard Theodorus; Salma Khaula Bazla; Muhamad Zaki Adika; Rifqi Andika Putra; Silvi Ariyanti; Muhammad Zulkarnain
IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) Vol 4 No 3 (2025): Desember
Publisher : CV. IRA PUBLISHING

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56862/irajtma.v4i3.343

Abstract

This study aims to analyze the dimensional accuracy of tri-angle cutting tool insert mold prototipes produced via PETG-based 3D printing. The printing process was carried out with predetermined printing parameters, and the resulting prototipes were measured and compared with the original design dimensions. The evaluation focused on the main dimensions of the insert to determine dimensional deviation and accuracy. The results indicate that PETG 3D printing can produce mold prototipes with satisfactory dimensional accuracy, though minor deviations were observed due to printing parameters and material characteristics. This study is expected to serve as a reference for using 3D printing technology as an efficient, cost-effective alternative for manufacturing cutting tool mold prototipes.
Pengaruh Pelapisan Zinc Phosphate pada Baja Karbon ST42 terhadap Laju Korosi dan Ketahanan Aus Rio Candra Hermawan; Nani Mulyaningsih; M. Fendy Kussuma Hadi Sufyan
IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) Vol 4 No 3 (2025): Desember
Publisher : CV. IRA PUBLISHING

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56862/irajtma.v4i3.348

Abstract

This study investigates the effect of zinc phosphate coating duration on the corrosion rate and wear resistance of ST42 steel for maritime applications. The experimental method involved immersion at 90°C with time variations ranging from 10 to 30 minutes. Corrosion rate testing utilized the potentiodynamic method (ASTM G102-89) in a 3.5% NaCl solution, while wear resistance was evaluated using the universal wear method (ASTM G99). The results indicate that the lowest corrosion rate occurred at a 30-minute coating duration (0.00678 mmpy), whereas the highest rate was at 10 minutes (0.08600 mmpy). Optimal wear resistance was observed at 20 minutes, yielding a value of 0.000642 mm³/kg·m. In conclusion, zinc phosphate coating effectively enhances the durability of ST42 steel against corrosive environments and mechanical friction. A 30-minute duration is recommended for maximum corrosion protection, providing a viable solution for extending the service life of maritime components such as anchor chains.
Sintesis dan Identifikasi Biodiesel dari Transesterifikasi Refined Palm Oil dengan Ko-pelarut Metil Ester Elvianto Dwi Daryono; Rini Kartika Dewi; Dwi Ana Anggorowati
IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) Vol 4 No 3 (2025): Desember
Publisher : CV. IRA PUBLISHING

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56862/irajtma.v4i3.349

Abstract

The transesterification of refined palm oil (RPO) with methyl ester (FAME) as a cosolvent was investigated to enhance solubility and mass transfer, thereby accelerating the reaction and improving biodiesel yield. This study aimed to evaluate the effects of FAME co-solvent concentration and reaction time on the transesterification process of RPO. The reaction was conducted using 250 g of RPO with a molar ratio of oil to methanol of 1:6, 0.8 wt% KOH catalyst, a stirring speed of 100 rpm, and a reaction temperature of 70°C. The co-solvent concentration was varied from 0% to 15%, while the reaction time ranged from 5 to 30 minutes. The reaction was carried out in a two-neck flask, followed by distillation to remove impurities. The resulting product was analyzed using gas chromatography and physical property tests. The optimum conditions were achieved at 5% FAME co-solvent concentration and a reaction time of 30 minutes, yielding a crude biodiesel yield of 99%, a FAME concentration of 999,265 mg/L, and a density of 0.88 g/mL, which meet the biodiesel quality standard SNI 7182:2015. The use of FAME as a co-solvent improves process efficiency by eliminating the need for a co-solvent separation step at the end of the reaction.
Desain dan Simulasi Screw Press Mesin Pencetak Briket Imam Arif Ramadhan; Ali Hasimi Pane; Intan Zahar
IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) Vol 4 No 3 (2025): Desember
Publisher : CV. IRA PUBLISHING

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56862/irajtma.v4i3.350

Abstract

Screw Press es are used to push and coMPact briquette raw materials into molds. One problem with Screw Press es is damage caused by friction and pressure acting on the machine, which necessitates simulation using Computer-Aided Engineering (CAE). This study aims to simulate the Screw Press  design and the distribution of stress and strain (von Mises). The material used is aluminum 6082-T6 with a yield strength of 280 MPa and an ultimate strength of 310 MPa. The results show that the Screw Press  design simulation with load variations of 2 N, 4 N, and 6 N has maximum stresses of 4.9 MPa, 5.08 MPa, and 5.26 MPa, respectively, and maximum strains of 6.99, 7.22, and 7.47, respectively, and a safety factor at the maximum scale value (≈15). This study contributes to the identification of potential local plasticity at the base of the Screw Press  of the briquette molding machine as a design consideration. Overall, the Screw Press  structure is still below the material yield limit and is declared safe.
Pengembangan Aplikasi Tabel Uap Portabel yang Mengintegrasikan IAPWS-IF97 dan CoolProp untuk Analisis Termodinamika Agus Manggala; Muhammad Yerizam; Sahrul Effendy
IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) Vol 4 No 3 (2025): Desember
Publisher : CV. IRA PUBLISHING

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56862/irajtma.v4i3.351

Abstract

The advancement of modern thermodynamic technology requires educational software capable of accurately calculating and visualizing the thermophysical properties of water and steam in accordance with the IAPWS-IF97 Industrial Formulation. This study presents the development of a standalone Python-based Steam Table application that integrates two thermodynamic property calculation backends, IAPWS-IF97 and CoolProp, into a single executable (.exe) package that operates without any additional installation. The application performs real-time calculations of thermodynamic properties, including enthalpy, entropy, pressure, and temperature, and provides interactive visualizations on h–s (Mollier) and T–s diagrams. The novelty of this research lies in integrating dual thermodynamic engines into an automated build-release system based on batch scripting, enabling efficient, reproducible compilation, version control, and distribution. Validation results show that the application operates stably in Windows 10–11 environments without external dependencies, producing results consistent with the IAPWS-IF97 reference tables, with a maximum deviation of less than ±0.05% across all tested state points. This tool is expected to serve as a lightweight, open-source, and adaptable platform for thermodynamic learning and research, particularly for studies involving the Rankine cycle, steam power plants (PLTU), and geothermal energy systems.
Tinjauan Komprehensif Teknologi Pemulihan Panas Terbuang (Waste Heat Recovery) pada Sistem Boiler untuk Peningkatan Efisiensi dan Reduksi Emisi Muhammad Rafif Dzaky Abdad; Saika Khoolish Rochma Fa’alih; Wildan Yusril Nurhuda Rizkiawan; Muhamad Fraja Dwi Putra; Yuki Trisnoaji
IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) Vol 4 No 3 (2025): Desember
Publisher : CV. IRA PUBLISHING

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56862/irajtma.v4i3.352

Abstract

This systematic literature review examines the application of Waste Heat Recovery (WHR) technologies in boiler systems to improve thermal efficiency and reduce CO₂ emissions. Using the PRISMA 2020 framework, 20 relevant studies published between 2010 and 2025 were selected through predefined eligibility and quality criteria. A thematic analysis was conducted to synthesize methodological approaches, performance outcomes, and implementation challenges across the included studies. The findings indicate that WHR integration can enhance thermal efficiency by up to 20.3%, provide fuel savings of 17.9%, and reduce CO₂ emissions by approximately 180 kg/MWh. Heat Recovery Steam Generators (HRSG) and Organic Rankine Cycle (ORC) systems demonstrate the highest performance levels, although their adoption is often constrained by higher capital costs and engineering complexity. The review also highlights gaps in policy incentives and regulatory support, which remain significant barriers to large-scale deployment. Overall, WHR technologies present a strategic pathway for improving industrial energy efficiency and advancing decarbonization efforts through a synergistic interplay of technological innovation, economic feasibility, and supportive policy frameworks.  
Pembubutan Aluminium 6061 dengan Fluida Potong Hibrida Berbasis Minyak Nabati Menggunakan Metode MQL Mohammad Anshori; Agus Sulistiawan
IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) Vol 4 No 3 (2025): Desember
Publisher : CV. IRA PUBLISHING

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56862/irajtma.v4i3.355

Abstract

This study investigates the performance of hybrid cutting fluids derived from rubber seed oil and coconut oil in the turning of Aluminium 6061 using the Minimum Quantity Lubrication (MQL) technique. The research aims to evaluate the influence of cutting fluid flow rate and coconut oil concentration on surface roughness. Turning experiments were conducted at a spindle speed of 500 rpm, a feed rate of 0.011 mm/rev, and a depth of cut of 0.5 mm. The cutting fluid flow rates were set at 50, 100, and 150 ml/h, while the coconut oil content was varied at 5%, 10%, and 15%. Each experimental condition was repeated three times to ensure data reliability. The results show that increasing both the fluid flow rate and the coconut oil fraction consistently reduces surface roughness. The minimum surface roughness of 0.924 µm was obtained at a flow rate of 150 ml/h with 15% coconut oil. These findings indicate that hybrid vegetable-oil-based cutting fluids are a promising biodegradable alternative for sustainable, precision-turning applications.
Pengaruh Isolasi Selimut Api Pasca-Pengelasan terhadap Perilaku Mekanik Sambungan Las FCAW pada Baja EH36 Ade Putra Kurniawan; Ida Farida; Immanuel Heprianto Simanjuntak
IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) Vol 4 No 3 (2025): Desember
Publisher : CV. IRA PUBLISHING

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56862/irajtma.v4i3.356

Abstract

Welding of EH36 steel, a widely used high-strength material in ship construction, may compromise joint toughness when post-weld cooling rates are not properly controlled, thereby affecting the fusion integrity between the weld metal and the base metal. This study investigates the effectiveness of a Fire Blanket as a post-weld thermal insulation method to regulate cooling rates and enhance the deformation resistance of welded joints. Two EH36 welded specimens were fabricated using the flux-cored arc welding (FCAW) process: one without insulation and the other covered with a Fire Blanket immediately after welding. The cooling behavior of both specimens was monitored, and joint performance was evaluated through a side bend test conducted in accordance with BKI standards to assess fusion quality and mechanical robustness. The results indicate that the Fire Blanket substantially reduced the cooling rate, with the insulated specimen reaching near-ambient temperature after approximately 270 minutes, compared with about 120 minutes under natural cooling. This moderated cooling resulted in superior deformation capacity, as evidenced by a higher maximum bending load of 50.0 kN for the insulated specimen, compared with 41.2 kN for the uninsulated specimen, representing an improvement of 21.3%. This study presents an experimental approach to evaluating the use of a Fire Blanket as a post-weld insulation technique for EH36 steel. The findings demonstrate that controlled cooling with thermal insulation can effectively improve weld-joint reliability in ship construction and may serve as a practical strategy for broader structural welding applications.

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