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Politeknik Negeri Semarang, Indonesia
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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 505 Documents
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The Effect of Clay Tile Particle Addition on the Flame Retardancy and Impact Toughness of Ramie Fiber-Reinforced Polypropylene Composites Muhammad Gibrail; Sri Hastuti; R. Faiz Listyanda; Eko Saputra; Wahyu Nugroho; Farika Tono Putri; Ragil Tri Indrawati; Xander Salahudin
Jurnal Rekayasa Mesin Vol. 21 No. 1 (2026): Volume 21, Nomor 1, April 2026
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v21i1.7458

Abstract

Environmental concerns regarding polypropylene (PP) plastic waste have driven the demand for more sustainable alternative materials through composite development. This study aims to analyze the effect of adding Sokka roof tile particles as a filler on the flame retardancy and impact toughness of ramie fiber-reinforced composites. The composite materials utilize a polypropylene matrix, ramie fiber reinforcement, and Sokka roof tile particles as filler with concentration variations of 2%, 4%, and 6%. The results demonstrate that increasing the filler volume significantly improves the material's flame-retardant properties, with the 6% variation achieving the best thermal performance and the lowest burn rate of 214.27 mm/min. However, in terms of mechanical properties, a decline in impact toughness was observed as the filler content increased; the average energy absorption dropped from 1.075 Joules at 2% concentration to 0.735 Joules at 6%, which is consistent with the decrease in impact strength from 0.0364 J/mm² to 0.0204 J/mm². This phenomenon indicates that while inorganic particles effectively serve as a thermal barrier, excessively high concentrations increase material brittleness, thereby reducing the impact energy absorption capacity. In conclusion, a 6% concentration of Sokka roof tile particles is recommended for applications prioritizing fire safety, while considering the compromise in mechanical strength.
A Comparative Analysis of Epoxy Coating Quality on ASTM AH-36 Steel Plates Using Surface Preparation Methods Rahmat Hidayat; Rando Tungga Dewa; Thaha Yassin Ramadhan Utomo; Muhammad Rizky; Mariyan Maritza Ramadhan; Leander Berliano Farel Kristiyono; Ainur Rofiq
Jurnal Rekayasa Mesin Vol. 21 No. 1 (2026): Volume 21, Nomor 1, April 2026
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v21i1.7507

Abstract

The shipping industry, vital to the global economy, faces significant challenges due to corrosion in marine environments, particularly affecting steel structures like AH36 grade used in ships. This study investigates the effectiveness of two surface preparation methods—Abrasive Blast Cleaning and Power Tool Cleaning—on the adhesion of epoxy coatings, which are essential for enhancing corrosion resistance. Employing ASTM standards, we assessed surface roughness and adhesion strength, revealing that Abrasive Blast Cleaning produced a superior average roughness of 106.34 µm compared to 17.67 µm from Power Tool Cleaning. The Tape X-Cut test further demonstrated that the former achieved a perfect adhesion rating of 5A, while the latter only reached 4A, indicating slight peeling. These findings underscore the critical role of surface preparation in optimizing coating performance, suggesting that adopting Abrasive Blast Cleaning can significantly extend the lifespan and operational efficiency of both commercial and military vessels. This research not only addresses the urgent need for improved protective measures in the shipping sector but also contributes to reducing economic losses attributed to corrosion, estimated at 3-4% of GDP annually.
The Influence of Asymmetric Load Distribution on V-Belt and Pulley Transmission in Belt Conveyor Systems Ade Irvan Tauvana; Syafrizal Syafrizal; Gilang Ramadhan
Jurnal Rekayasa Mesin Vol. 21 No. 1 (2026): Volume 21, Nomor 1, April 2026
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v21i1.7515

Abstract

Belt conveyor performance is highly dependent on the uniformity of load distribution along the belt. In practical applications—particularly in industrial, retail, and airport environments spatial limitations often force systems to operate under asymmetric loading conditions. This situation introduces a technical problem because uneven load distribution can alter contact pressure, increase belt misalignment, and accelerate mechanical wear. Although numerous studies have explored belt tensioning, pulley design, and material durability, only limited research specifically addresses the influence of asymmetric loads on slip behavior, indicating a gap in understanding the dynamic response of pulley–belt transmission systems. This study aims to experimentally evaluate the effect of asymmetric load distribution on slip characteristics in a conveyor belt transmission. The experimental setup involved shifting the load to the left or right side of the belt, while pulley speed was measured using a PLC-based monitoring system integrated with an inverter controlling a three-phase induction motor. Measurements were conducted at operating frequencies of 5–8 Hz under both symmetric and asymmetric loading scenarios. Results show that under symmetric loading, slip decreased by 0.632% across the tested speed range. Under asymmetric loading, the slip reduction increased to 1%, demonstrating that lateral load shifts generate higher local contact forces and temporarily enhance local transmission efficiency. However, this condition also has the potential to cause belt instability and reduce the lifespan of mechanical components. In conclusion, asymmetric loading significantly affects slip performance, offering short-term efficiency benefits but posing long-term operational risks. These findings provide important practical insight for optimizing conveyor systems operating in environments with constrained or non-uniform load conditions.
Front Matter Jurnal Rekayasa Mesin Vol. 21 No. 1 April 2026 Jurnal Rekayasa Mesin
Jurnal Rekayasa Mesin Vol. 21 No. 1 (2026): Volume 21, Nomor 1, April 2026
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v21i1.7584

Abstract

Back Matter Jurnal Rekayasa Mesin Vol. 21 No. 1 April 2026 Jurnal Rekayasa Mesin
Jurnal Rekayasa Mesin Vol. 21 No. 1 (2026): Volume 21, Nomor 1, April 2026
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v21i1.7586

Abstract

Analysis of the Effect of Fin Design Variations on Drag Coefficient and Drag Force on RX-450 Rocket using CFD Simulation Andi Wira Satria; Edi Sofyan; Muhammad Fa'iz Alfatih
Jurnal Rekayasa Mesin Vol. 21 No. 2 (2026): Volume 21, Nomor 2, Agustus 2026
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Aerodynamic drag is one of the main factors affecting rocket performance during supersonic flight, as it directly influences stability, fuel efficiency, and flight range. This study was conducted to evaluate the influence of fin geometry variations specifically sweep angles (50°, 54.46°, and 60°) and semispan lengths (450 mm, 500 mm, and 550 mm) on the aerodynamic characteristics of the RX-450 rocket. The geometry was digitally modeled, and simulations based on Computational Fluid Dynamics (CFD) were carried out under airflow conditions at Mach 3.3. The results show that the fin design with a 60° sweep angle and 450 mm semispan yielded the lowest Coefficient of Drag (CD) and Drag Force (DF), at 0.0744 and 226.47 N, respectively. This design also fulfilled stability requirements, indicated by a positive stability margin. In conclusion, variations in fin design significantly affect the rocket’s aerodynamic characteristics, and a smaller sweep angle with a shorter semispan is recommended to improve performance.
Strength Analysis of Dissimilar Welded Joints Applied to Hydraulic Excavator Rod Arm Abdul Choliq; Fifit Astuti; Nur Rohmat
Jurnal Rekayasa Mesin Vol. 21 No. 2 (2026): Volume 21, Nomor 2, Agustus 2026
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Dynamic workloads during hydraulic excavator operations frequently cause the joint between the shaft rod and the rod end to crack or even fracture. Although welding is often selected for economic reasons, the strength of this joint must be tested to ensure the operational safety of the heavy equipment. This study evaluates the mechanical characteristics of a dissimilar weld joint between AISI 1045 and AISI 4340 materials using the Gas Metal Arc Welding (GMAW) method with a current of 90 Amperes and a voltage of 19 V and varying filler metals: ER70S-6 and ER110S-G. Tensile test specimens were prepared in accordance with the ASTM E8/E8M-13a standard, featuring a length (L) of 50 mm and a diameter (D) of 12 mm. The welded samples subsequently underwent hardness testing using the Vickers method. Test results indicate that samples using ER70S-6 filler metal exhibited an average tensile strength of 544 N/mm2 and a yield strength of 484 N/mm2. Meanwhile, samples using ER110S-G filler metal showed an average tensile strength of 766 N/mm2 and a yield strength of 613 N/mm2. Hardness test results for the ER70S-6 samples showed average values ​​of 279 HV in the AISI 1045 Heat-Affected Zone (HAZ), 358 HV in the AISI 4340 HAZ, and 167 HV in the weld metal. Conversely, the ER110S-G samples recorded average hardness values ​​of 238 HV in the AISI 1045 HAZ, 383 HV in the AISI 4340 HAZ, and 280 HV in the weld metal. In conclusion, the ER110S-G filler metal resulted in a greater increase in both tensile strength and joint hardness compared to ER70S-6. This condition is driven by the characteristics of ER110S-G as a high-strength, low-alloy (HSLA) steel weld metal containing nickel (Ni), chromium (Cr), and molybdenum (Mo). The combination of these alloying elements produces a solid solution strengthening mechanism that results in a significantly more robust weld metal matrix structure.
Effect of Sandblasting Pressure on Corrosion Rate and Adhesion Strength in the Coating Process Rizal Catur Prasetyo; Nani Mulyaningsih; Adityo Noor Setyo Hadi Darmo
Jurnal Rekayasa Mesin Vol. 21 No. 2 (2026): Volume 21, Nomor 2, Agustus 2026
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

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Abstract

Street lighting poles are an essential component of public street lighting (PSL) infrastructure and are commonly manufactured from low-carbon steel. However, this material is highly susceptible to corrosion if adequate surface protection is not provided. One of the most widely adopted protection methods is paint coating. Nevertheless, paint coatings remain vulnerable to mechanical damage, which may result in coating delamination and consequently reduce corrosion protection performance. Therefore, it is necessary to investigate process parameters that can improve coating adhesion while maintaining the corrosion resistance of the substrate. This study aims to evaluate the effect of sandblasting pressure on the corrosion rate and paint coating adhesion strength of low-carbon steel. Sandblasting was carried out at three pressure levels: 7, 8, and 9 bar. The corrosion behaviour was evaluated using the potentiodynamic polarisation method, while the coating adhesion strength was measured using a pull-off adhesion test. The results indicate that increasing the sandblasting pressure led to an increase in the corrosion rate. The specimen treated at 7 bar exhibited the lowest corrosion rate of 0.00428 mm/year, whereas the specimen treated at 8 bar showed the highest corrosion rate of 0.14998 mm/year. In contrast, higher sandblasting pressure improved the adhesion strength of the paint coating. The highest average adhesion strength of 2.73 MPa was obtained at 9 bar, while the lowest value of 2.28 MPa was recorded at 7 bar. These findings demonstrate that sandblasting pressure significantly influences the surface characteristics of low-carbon steel, thereby affecting both its corrosion behaviour and coating adhesion performance. The results provide useful insights for optimising surface preparation prior to painting and may contribute to improving the durability of protective coatings for street lighting applications.
Performance of an Air-Water Harvester Machine under Various Inlet Air Relative Humidity Conditions Mirmanto Mirmanto; Made Wirawan; Faniar Reza Khatami; Arif Mulyanto; Yesung Allo Padang; Nurchayati Nurchayati; Jayus Kharisma Hendra
Jurnal Rekayasa Mesin Vol. 21 No. 2 (2026): Volume 21, Nomor 2, Agustus 2026
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Atmospheric water harvesting (AWH) using vapor-compression refrigeration systems has emerged as a promising approach for decentralized freshwater production. Although previous studies have investigated the effects of refrigeration-system configurations and operating parameters on water production, the influence of inlet air relative humidity on freshwater productivity, heat-transfer characteristics, and thermodynamic performance has not been comprehensively evaluated within a single experimental framework. This study experimentally investigates the performance of an air-water harvester operating at inlet relative humidities of 30%, 50%, and 70% under controlled laboratory conditions. Freshwater production, coefficient of performance (COP), total heat absorbed by the evaporator, and evaporator efficiency were evaluated using measurements of temperature, pressure, airflow velocity, electrical power consumption, and psychrometric properties. The results show that increasing inlet relative humidity significantly enhanced condensation and system performance, yielding the highest freshwater production of 0.345 kg and the maximum COP of 12.19 at 70% RH. In contrast, the highest evaporator efficiency (11.89%) and total heat absorbed by the evaporator (167.81 W) were obtained at 30% RH, where sensible heat transfer dominated the cooling process. The findings indicate that inlet air relative humidity strongly influences the distribution of sensible and latent heat transfer, thereby affecting both freshwater production and energy performance. This study provides an integrated experimental assessment of the thermodynamic response of refrigeration-based AWH systems to varying inlet humidity and offers practical guidance for optimizing system operation in humid tropical environments.
Tribological Performance of Bio-Inspired Surface Textures Fabricated by SLA 3D Printing Muhammad Khafidh; Muhammad Imaduddin
Jurnal Rekayasa Mesin Vol. 21 No. 2 (2026): Volume 21, Nomor 2, Agustus 2026
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

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Abstract

Tribological performance, particularly friction and wear, is one of the key factors determining the service life of engineering components. Although stereolithography (SLA) 3D printing has been increasingly adopted for various functional applications, studies on the tribological performance of SLA-printed surfaces remain limited. Surface texturing inspired by biological systems offers a promising approach to improve surface functionality. This study investigates the friction and wear behaviour of bio-inspired surface textures fabricated using SLA 3D printing. Five texture geometries were evaluated, namely original snake dorsal, simplified snake dorsal, snake ventral, shark micro-riblet, and giant salvinia leaf textures. Tribological tests were performed using a pin-on-disc tribometer under a normal load of 10 N and a rotational speed of 200 RPM. The results show that surface texture significantly influences tribological behaviour. The original snake dorsal texture exhibited the lowest wear of 0.0025 g, indicating superior wear resistance, while the snake ventral texture produced the lowest friction force of 2.82 N. In contrast, the shark micro-riblet texture generated the highest friction of 3.58 N. These results demonstrate that different bio-inspired geometries produce distinct tribological responses and confirm the potential of SLA 3D printing for the fabrication of functional textured surfaces.

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