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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 195 Documents
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Analisis Kelayakan Tangki Timbun CPO Kapasitas 500 dan 1000 Ton Berdasarkan Ketebalan Roundshell, Suhu, dan Tekanan Hidrostatis Raja, Pada Mulia; Mahyunis, Mahyunis; Istiadzah, Tiara Briliani; Zakwan, Zakwan; Winardi, Rafeal Remit; Rahimah, Rahimah; Lubis, Zulyaden
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.v4i3.278

Abstract

This study aims to determine the feasibility of using 500-ton and 1000-ton Crude Palm Oil (CPO) storage tanks in a palm oil mill. The evaluation is based on the roundshell thickness, operating temperature, and hydrostatic pressure acting on the tanks. A descriptive quantitative method was applied using primary and secondary data from PMKS Simpang Gambir. The results showed that for the 500-ton tank, the calculated roundshell thickness is 8.6 mm, the actual is 8.87 mm, and the design is 9 mm, with a hydrostatic pressure of 5.73 Pa. For the 1000-ton tank, the calculated thickness is 13.1 mm, the actual thickness is 13.8 mm, and the design thickness is 14 mm, with a hydrostatic pressure of 11.46 Pa. The corrosion rates are 0.00072 mm/month and 0.0011 mm/month, respectively. Based on the analysis, the 500-ton tank is feasible for continued use for approximately 31 years, and the 1000-ton tank for 53 years, assuming constant corrosion rates.
Kebutuhan Energi Mekanik Mesin Perontok Sawit Dengan Motor Listrik Tiga Fasa Melalui Transmisi Sabuk-V Di Pabrik Kelapa Sawit Kusuma, Nanda; Faisal, Busrizal; Winardi, Rafael Remit
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.v4i3.286

Abstract

A thresher is a crucial unit in a palm oil mill that separates loose fruit from fresh fruit bunches (FFB). Its performance is significantly influenced by the availability of mechanical energy transmitted from a three-phase electric motor through a V-belt system. This study aims to analyze the mechanical energy requirements of a thresher under varying FFB loads and electrical parameters. The research method employed field observation, current and voltage measurements, and energy consumption calculations. The results indicate that the greater the FFB load processed, the higher the motor's electrical current requirements. The maximum current was 49.84 A at 380 V, with a motor power of 20 kW. The highest load the machine can handle is 3,324 kg, with a kinetic energy requirement of 72,000 kJ. Analysis of the current-load relationship shows a linear pattern, confirming a direct relationship between increasing mechanical capacity and electrical energy consumption. These findings emphasize that matching electrical power to mechanical load capacity is crucial to prevent energy inefficiency and machine damage from overload. This research contributes to efforts to optimize energy consumption in palm oil mills by regulating input load, maintaining the V-belt transmission system, and implementing more efficient motor control technology.
Analisis Pengaruh Bentuk Ekor dan Kecepatan Kendaraan terhadap Performa Aerodinamis Purwarupa Kendaraan Mandalika Desantara Suryadi, Sapwan; Tira, Hendry; Yudhyadi, I Gusti Ngurah Ketut
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.v4i3.296

Abstract

Increased energy demand and the automotive industry in Indonesia are driving innovation in efficient vehicles through more aerodynamic designs. This study tested the aerodynamic performance of the Mandalika Desantara vehicle prototype on variations in tail shape and vehicle speed. The computational fluid dynamics simulation method was used to obtain the aerodynamic parameters. The speed variations applied were 12.33 m/s, 17.89 m/s, 23.44 m/s, and 29 m/s. The results showed that vehicles with long tails had better aerodynamics with a drag coefficient of 0.0849 and a lift coefficient of 0.0889 at a speed of 29 m/s. The low drag and lift coefficients indicated reduced drag and lift forces, thereby improving performance and maintaining vehicle stability.
Manufaktur Alat Pengolah Limbah Plastik Menjadi Bahan Bakar Alternatif (Minyak Solar) dengan Metode Pirolisis Zaira, Jupri Yanda Zaira; Dani, Darwis; Novison, Roni; Wijianto, Agus; Hasibuan, M. Refky
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.v4i3.308

Abstract

Pyrolysis is a thermochemical process that can break down organic/inorganic materials into more valuable compounds by heating them to high temperatures. In this research, a laboratory-scale plastic waste pyrolysis system was manufactured, designed using CAD software, with all material components and the heating system selected. The pyrolysis unit consists of a stainless-steel reactor tube as the main component with a diameter of 0.5 m and a height of 1.5 m, an LPG-based heating system, and a galvanic condensation tube to convert vapor into pyrolysis oil. The manufacturing process involved fabricating the reactor tube using Shielded Metal Arc Welding (SMAW) with a 2.6 mm-diameter E6013 electrode. The testing was conducted at temperatures ranging from 300 to 400°C, with a capacity of 10 kg of polyethylene (PE) and polypropylene (PP) plastic per cycle. During the initial phase, leaks were found at the pipe joints and reactor lid, but repairs using heat-resistant sealing adhesive successfully restored the device to proper function. The outcome of this research is the creation of a pyrolysis unit capable of converting plastic waste into a primary product, pyrolysis oil. Each cycle, with a plastic waste capacity of 10 kg, can produce approximately 4.5 liters of pyrolysis oil, along with pyrolysis gas and solid residue. The produced pyrolysis oil has a calorific value of approximately 462 kJ/kg, which is close to that of fossil fuels (diesel oil), with a density of 0.83- 0.85 g/cm³.
Analisis Postur Kerja Analis Laboratorium dengan Metode RULA untuk Mengurangi Risiko MSDs Arjuna, Febri Gilang; Harahap, Uun Novalia; Hasibuan, Yetti Meuthia; Haniza, Haniza
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.v4i3.312

Abstract

This study aims to analyze the working postures of laboratory analysts using the Rapid Upper Limb Assessment (RULA) method to identify the risk of Musculoskeletal Disorders (MSDs). Observations were conducted during primary laboratory activities to document body posture, joint angles, and work duration. The RULA assessment indicated moderate to high risk, suggesting the need for immediate corrective actions. Major contributing factors to MSD risk included bent working postures, repetitive arm movements, and non-ergonomic workstation design. Recommended improvements involve workstation adjustment, posture correction, and the application of ergonomic principles. This study is expected to support MSD prevention efforts and improve comfort and productivity among laboratory analysts.
Pemanfaatan Tungku Berbahan Bakar Oli Bekas untuk Peleburan Aluminium Daur Ulang dan Kajian Mikrostruktur serta Kekerasan Pasca Quenching Aldori, Yopan Rahmad; Suprapto, Suprapto; Idris, Muhammad; Prayoga, Muhammad Angga; Girsang, Evan Roland
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.v4i3.313

Abstract

This study investigates the use of a Waste-Oil-Fueled Furnace (WOFF) as an alternative heat source in the melting process of recycled Al-3004 aluminum. The melting was carried out using the sand casting method at a pouring temperature of approximately 730 °C, while measurements indicated the furnace could reach ±900 °C, exceeding the melting point of Al-3004 (±660 °C). The cast specimens were subsequently quenched in three media: water, oil, and air. Microstructural observations revealed that the cooling rate significantly affected crack formation: water quenching produced the largest cracks, oil quenching produced medium-sized cracks, and air cooling produced the finest cracks. Micro Vickers hardness testing supported these findings, showing significant differences in hardness values across the quenching media. Overall, the study confirms that the waste-oil-fueled furnace is an effective alternative energy-based metal-melting technology, while the choice of cooling medium plays a crucial role in controlling the material's microstructural features and mechanical properties.
Karbon Aktif Berkelanjutan dari Limbah Bonggol Pisang: Karakterisasi dan Kinerja Adsorpsi untuk Limbah Industri Irsyadul Ibad, Mochamad; Bashori, Hasan
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.v4i3.314

Abstract

This study investigates the use of banana corm waste as a raw material for producing activated carbon for textile wastewater treatment. The objective of the research was to produce activated carbon from banana corms using potassium hydroxide (KOH) and sulfuric acid (H₂SO₄) as activating agents, and to evaluate its adsorption performance on methylene blue dye. The activated carbon was prepared through carbonization at 250°C, followed by chemical activation using KOH and H₂SO₄, washing to neutral pH, and drying. The characterization included moisture content, ash content, iodine adsorption capacity, methylene blue adsorption, and UV-Vis spectrophotometric analysis. The results showed that H₂SO₄-activated carbon exhibited higher methylene blue adsorption capacity compared to KOH-activated carbon, while KOH-activated carbon had lower ash content. Overall, the activated carbon derived from banana corms met the quality standards for activated carbon in terms of moisture, ash, and iodine adsorption. These findings indicate that banana corm-based activated carbon has potential as an eco-friendly, effective adsorbent for removing dye pollutants from textile wastewater.
Analisis Variasi Rapat Dan Tegangan Pada Proses Anodisasi Terhadap Kekerasan dan Ketahanan Aus Paduan Aluminium Rizky, Muhammad Adrian; Mulyaningsih, Nani; Hadi Sufyan, Fendy Kussuma
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.v4i3.315

Abstract

Aluminum alloys are widely used in the automotive industry, particularly for radiators, due to their lightweight nature, good corrosion resistance, and excellent thermal conductivity. However, these materials remain vulnerable to wear from internal erosion and contamination, necessitating additional protection. This study investigates the effects of varying current density and voltage during anodizing on the hardness and wear resistance of 3xxx-series aluminum alloys. The process was carried out in a sulfuric acid (H₂SO₄) electrolyte for 40 minutes using currents of 4 A and 5 A, combined with voltages of 25 V and 35 V. Micro-Vickers testing revealed the highest hardness of 162.63 VHN at 4 A and 25 V, while the best wear resistance was achieved at 5 A and 35 V with a specific wear rate of 0.000302371 mm³/kg (an improvement of 24%).
Analisis Kekuatan Tarik Polimer Komposit Polyethylene Terephthalate Berpengisi Karbon Aktif Pada Aplikasi Fuel Cell Iswandi, Iswandi; Setyanto, Djoko
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.v4i3.319

Abstract

Bipolar plates made from polymer–activated carbon composites offer a lightweight, economical alternative but require a balance between mechanical strength and the amount of carbon filler. This is because a filler fraction that is too high can cause agglomeration and void formation, ultimately reducing the tensile strength and overall performance of the plate. This study aims to evaluate the tensile strength of PET (Polyethene Terephthalate) composites with varying levels of activated carbon. The compositions tested were 90/10, 80/20, and 70/30 (wt%). Specimens were fabricated using a hot press (compression moulding). Tensile testing was conducted in accordance with ASTM D638. The tensile strength value was calculated from the maximum load to the cross-sectional area of ​​the specimen. The test results showed that the composite with 10% activated carbon produced 2.84 MPa. The addition of activated carbon up to 30% decreased the tensile strength to 1.05 MPa. This trend indicates that increasing the activated carbon composition decreases the tensile strength of PET composites for bipolar plate applications.
Pengaruh Head dan Jumlah Nozzle terhadap Kinerja Turbin Pelton Skala Laboratorium Supriatno, Supriatno; Setyanto, Djoko
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.v4i3.320

Abstract

This experimental study examines the influence of hydraulic head and nozzle number on the performance of a laboratory-scale Pelton turbine. A closed-loop test rig was developed, enabling operation with one, two, and four nozzles. The turbine, consisting of 12 buckets, was mechanically coupled to an electrical generator through a belt–pulley transmission. Experimental results reveal that increasing the number of nozzles enhances turbine efficiency, with recorded values of 2.8%, 15.8%, and 17.7% for single-, double-, and four-nozzle configurations, respectively. Despite this improvement, the turbine failed to operate at its optimal efficiency, primarily due to discrepancies between the available head and the turbine design parameters, as well as energy losses and suboptimal jet impingement.

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