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Jurnal Polimesin
Published by Politeknik Negeri Lhokseumawe
ISSN : 16935462     EISSN : 25491199     DOI : http://dx.doi.org/10.30811/jpl
Core Subject : Science, Engineering,
Automotive Engineering Control & Systems Engineering Engineering Materials Science & Nanotechnology Mechanical Engineering
Polimesin mostly publishes studies in the core areas of mechanical engineering, such as energy conversion, machine and mechanism design, and manufacturing technology. As science and technology develop rapidly in combination with other disciplines such as electrical, Polimesin also adapts to new facts by accepting manuscripts in mechatronics. In Biomechanics, Mechanical study in musculoskeletal and bio-tissue has been widely recognized to help better life quality for disabled people and physical rehabilitation work. Such a wide range of Polimesin could be published, but it still has criteria to apply mechanical systems and principles. Exceeding the limitation has been a common reason for rejection by those outside the scope. Using chemical principles more than mechanical ones in material engineering has been a common reason for rejection after submission. Excessive exploration of the management within the discipline of Industrial Engineering in the manufacturing technology scope is also unacceptable. The sub-scope biomechanics that focuses on ergonomics and does not study movement involving applied force on the bio-tissue is also not suitable for submission.
Arjuna Subject : Teknik (semua kategori) - Teknik Mesin
Articles 553 Documents
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Distortion and mechanical properties of welded AA5083 aluminum material with friction stir welding Pujono, Pujono; Kurniawan, Ipung; Pribadi, Joko Setia; Laksana, Nur Akhlis Sarihidaya; Tarigan, Roy Aries Permana
Jurnal Polimesin Vol 23, No 5 (2025): October
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i5.7798

Abstract

AA5083 series aluminum is one of the primary materials used in ship construction due to its excellent weldability in conventional welding processes, such as arc welding. However, similar to other aluminum alloys, the weakness of AA5083 is the occurrence of frost cracking during the welding process, especially in the HAZ and the large amount of distortion.. The research was conducted by providing additional treatment in the form of in-situ rolling on friction stir welding (FSW). The in-situ rolling treatment used a single roll positioned directly on the weld area and behind the FSW tool and moving simultaneously with the welding process and with a roll load of 8000N. The characterization carried out included thermal cycle measurements, microstructure observations, hardness value distribution testing, distortion measurements and tensile testing. The results showed that the largest distortion value occurred in the welded material without additional treatment (as welded) of 2.81 mm, while in the material with additional treatment (mechanical), the distortion value was smaller at 1.1 mm. The mechanical specimen had the best mechanical qualities, with a tensile strength of 225.5 MPa and an average hardness value of 61 VHN, whereas the as-welded specimen's tensile strength was 201.8 MPa. This phenomenon occurs because the specimen, with the addition of in situ rolling, experiences grain refinement, and it seems that this is consistent with the Hall-Petch relationship, σ_y=σ_0+k_y d^(-1/2)Materials with fine grains are harder and stronger than materials with coarse grains, because fine grains have a larger total grain boundary area to hinder dislocation movement. The tensile fracture position was in the advancing side region, where higher heat input occurred in this region than in the retreating side. 
An in-situ experimental and numerical evaluation on thermoelectric generators performance utilizing diesel engine exhaust heat Sugiyanto, Sugiyanto; Aisyah, Nyayu; Prayitno, Yosephus Ardean Kurnianto; Bahiuddin, Irfan
Jurnal Polimesin Vol 23, No 5 (2025): October
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i5.7615

Abstract

Waste Heat Recovery (WHR) from heavy-duty diesel generators using Thermoelectric Generators (TEGs) offers a potential way to improve total system efficiency and reduce fuel consumption. This study combines experiments and numerical simulation to evaluate the performance of Hi-Z HZ 14 TEGs modules applied to a 6-cylinder, 60 kVA diesel generator. Experimentally, TEG modules were mounted equidistantly along the exhaust manifold, 40 cm from the engine, and tested at idle (750 rpm) with and without active air-side cooling. Hot- and cold-side temperatures, open-circuit Voltage (Voc), load power, and conversion efficiency were recorded. A matching TEG configuration was simulated under the same boundary conditions. As a result, active cooling increased the temperature differential and consistently improved power output and efficiency relative to natural convection. An efficiency of 2.1% was observed, in reasonable agreement with the simulation and consistent with typical TEGs performance under comparable operating conditions. Although this value confirms the feasibility of TEG integration in heavy-duty diesel exhaust systems, further improvements are possible through material selection, heat-sink optimization, and advanced cooling strategies.
Design and development of a radial air bearing concave profile for an educational tool Harja, Herman Budi; Febriani, Risky Ayu; Saksono, Novi; Diratama, M Yazid; Fauzi, M
Jurnal Polimesin Vol 23, No 5 (2025): October
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i5.7216

Abstract

The increasing demand for high-speed, precision machinery has highlighted the limitations of conventional friction and anti-friction bearings, driving the need for more advanced bearing technologies, such as air bearings. However, achieving competency and skills related to air bearing components is difficult to access, particularly radial air bearing rigs. This paper presents the design of a radial air bearing rig as a learning tool to support educational objectives in understanding the working principles, use, and maintenance requirements of air bearing systems. The design stages use the VDI 2222 methodology and utilize SolidWorks for modeling. Air quality specifications refer to the ISO 9001:2015 – New Way Air Bearings standards, which consist of a fly height of 5μm, with operational parameters of 4–6 Bar input pressure and 2–13 LPM flow rate. The rig uses a single-phase motor for shaft rotation and a porous pad for air distribution. The test results show that the rig achieves a fly height of 0.5 μm at 4 Bar pressure and 5 LPM flow rate, although its rotation exhibits resistance. These outcomes confirm the rig’s potential as an educational tool and highlight the need for mechanical improvements to enhance its performance.
The effect of copper thickness in catalytic converters on HC and CO emissions Hilmi, Albaihaqi; Winoko, Yuniarto Agus
Jurnal Polimesin Vol 23, No 6 (2025): December
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i6.6241

Abstract

Advances in transportation technology has significantly increases human mobility and supported economic growth, however it has also led to a rise in harmful exhaust emissions, which adversely affect air quality and contribute to climate change. To address this, it is essential to minimize exhaust emissions, one effective method being the use of catalytic converters. This study aims to investigate the effect of copper thickness, specifically variations of 0.2 mm, 0.5 mm and 0.7 mm as the basic material of catalytic converters. Experimental research using Honda Vario 125 motorized vehicles operating on Pertalite fuel, with emissions measured at varying engine speeds from 1500 rpm to 7000 rpm. The QROTECH QRO 401 gas analyzer was utilized to assess HC and CO exhaust emissions. The results indicate that the thickness of copper used in catalytic converters can effectively reduce CO and HC emissions. Specifically, the sample with a copper thickness of 0.7 mm demonstrated an average CO emission of 0.36% and a standard deviation of 0.0015, while the HC emission produced an average of 112 ppm with a standard deviation of 14.85.
Numerical and experimental investigation of scaling laws in PLA octet-truss lattice structures under compression load Yahya, Muhammad Yusri Dzal; Pramono, Agus Sigit
Jurnal Polimesin Vol 23, No 6 (2025): December
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i6.8353

Abstract

The demand for lightweight materials with superior strength-to-weight ratios in modern industry has driven innovation in architectural materials. Lattice structures, enabled by advances in Additive Manufacturing (AM), present a promising solution. However, their mechanical performance often deviates from theoretical predictions due to the complexity of the fabrication process, particularly in Fused Deposition Modeling (FDM) technology, which is prone to process defects and size effects. This study aims to address the discrepancy between scaling-law predictions and the actual mechanical response of an Octet-Truss lattice structure fabricated from Polylactic Acid (PLA) using FDM. This study specifically investigates the effects of geometric scaling up/down (0.75x, 1x, and, 1.25x) and the number of periodic unit cells (1 - 8) on compressive response up to the yield limit. To validate the compression behavior, this study combined Finite Element Analysis (FEA) with experimental compression testing of FDM-fabricated PLA specimens. A highly accurate linear regression model (R² 99.7%) was formulated, relating maximum compression force (Fmax) to the number of unitcells (ncell), with FEA predictions aligning with experimental results within a 1.70% error margin. This empirical scaling law facilitates accurate predictions of load-bearing capacity across a range of lattice configurations (with cell sizes ranging from 15 to 25 mm cell sizes ) and load predictions ranging from 312 to 2,847 N for all tested configurations. This contributes to the development of a practical and reliable predictive design tool for lightweight structural engineering applications.
Effect of nitrogen gas-assisted cooling on TIG weld distortion and mechanical properties of AA5083 aluminum alloy Hanggara, Fuad Dwi; Putra, Rama Dani Eka; Fitri, Tessa Zulenia; Nugroho, Handi Wilujeng; Prayogo, Dhanang Suryo
Jurnal Polimesin Vol 23, No 6 (2025): December
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i6.7910

Abstract

This study investigates the effect of nitrogen gas-assisted static cooling on weld distortion and mechanical properties of AA5083 aluminum alloy joined by Tungsten Inert Gas (TIG) welding. Although various cooling techniques have been reported to control heat input and distortion in aluminum welding, the combined influence of static nitrogen cooling and welding current on both distortion behavior and local mechanical properties of AA5083 remains insufficiently understood. Three welding current levels (100 A, 110 A, and 120 A) were applied while maintaining constant welding speed, arc voltage, and shielding gas flow. Mechanical properties, including tensile strength and Vickers hardness, were evaluated across the weld metal, Heat-Affected Zone (HAZ), and base metal. Thermal-induced distortion was analyzed using 3D profiling and validated through Analysis of Variance (ANOVA) statistical tests. The results indicate that a welding current of 100 A with static nitrogen cooling minimizes distortion and achieves the highest tensile strength (197.41 MPa). The highest yield strength was recorded at 120 A (160.31 MPa), while the maximum hardness values were observed in the weld metal at 110 A (135.83 VHN), HAZ at 120 A (117.63 VHN), and base metal at 100 A (124.1 VHN). Statistical analysis confirms that welding current significantly influences both distortion and mechanical outcomes (p 0.05), while the cooling method shows a moderate effect. These findings demonstrate that nitrogen-assisted static cooling offers a practical approach to improving weld quality by balancing dimensional stability and mechanical performance in precision aluminum welding applications.
Performance analysis of a solar-powered maize sheller: production capacity and shelling efficiency Hendradinata, Hendradinata; Firdaus, Firdaus; Okviyanto, Toni; Ramadhoni, Tri Satya; Tolusha Putra, Muhammad Rizky; Muttaqin, Muhammad Hafidzni; Taufikurrahman, Taufikurrahman
Jurnal Polimesin Vol 23, No 6 (2025): December
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i6.7880

Abstract

Post-harvest mechanization is essential for improving productivity and reducing labor intensity in smallholder agriculture. This study aims to design and test the performance of a portable solar-powered maize sheller prototype developed as an environmentally friendly and cost-effective alternative for rural farmers. The research employed an engineering design approach consisting of mechanical and electrical system design, prototype fabrication, and performance testing by comparing solar-powered and grid-powered machines. The key parameters analyzed included shelling capacity, shelling efficiency, energy efficiency, grain damage rate, battery charging time, and operating cost. The results showed that the prototype achieved a shelling capacity of 65 kg/h with a shelling efficiency of 90% and a grain damage rate of 5%, comparable to grid-powered machines (91.4%) and higher than fossil fuel-based machines (85%). The prototype’s energy efficiency was recorded at 62.5%, lower than a grid-powered-based machine (80%) due to conversion losses in the panel, battery, and inverter, but still superior to fuel-based machines (35%). Economic analysis indicated that the solar-powered machine had the lowest operating cost, only IDR 5.3/kg, compared to grid electricity at IDR 7.3/kg and fuel-based machines at IDR 115/kg. Equipped with a 12 V–20 Ah battery and a 200 Wp solar panel, the machine can operate independently with a charging time of about six hours under optimal solar radiation. This research demonstrates the feasibility of solar energy utilization in maize shelling as an efficient, economical, and environmentally friendly solution.
Influence of bonding compression and air gap on the acoustic absorption of spunbond–resinated felt composites Basri, Hasan; Feriyanto, Dafit
Jurnal Polimesin Vol 23, No 6 (2025): December
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i6.7954

Abstract

Spunbond-resinated felt is a common composite material used for automotive purposes. Reducing vehicle noise requires lightweight, cost-effective sound-absorbing materials. This study focuses on researching more lightweight and low-cost materials through examining how bonding compression and an air gap affect the acoustic absorption of Spunbond–Resinated felt composites with varying grammage (800–1400 g/m²) and thickness (15–22 mm). The novelty of this research is in the use of lower grammage and the existence of an air gap compared with the existing product and previous study. Acoustic absorption tests were conducted using an impedance tube with air-gap depths of 0, 10, and 15 mm behind the samples. Additional tests were conducted on compressed samples, 50% of the original thickness, to observe the effect of increased density. Results show that felt with 1200 g/m² provides the best overall absorption. Thickness compression reduces absorption by approximately 13–23%, whereas the introduction of an air gap significantly enhances absorption, particularly for lower-grammage materials. Notably, an 800 g/m² felt combined with a 15 mm air gap outperformed a 1400 g/m² felt without an air gap. These findings demonstrate that appropriate grammage and air gap design can enhance sound absorption, enabling lighter materials such as 800–1000 g/m² felt to meet noise-reduction requirements.
Comparative time analysis of digital photogrammetry software using AI methods for design recovery in digital manufacturing Paryanto, P.; Faizin, M.; Rusnaldy, R.
Jurnal Polimesin Vol 23, No 6 (2025): December
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i6.6846

Abstract

This research aimed to investigate the time efficiency of integrating traditional digital photogrammetry software compared to Artificial Intelligence (AI) in Reverse Engineering (RE). The investigation was conducted through a systematic comparison of the selected digital photogrammetry software and an AI-based method, using various objects for evaluation. Although high accuracy can be achieved with traditional photogrammetry software, the process is time-consuming, particularly for complex or large objects. Therefore, this research presents a timing analysis that demonstrates the efficiency advantages of AI-based methods over traditional digital photogrammetry software. The results showed that AI, by automating the reconstruction process, has the potential to reduce the time required for RE significantly. Moreover, the results of the 3D piston model using AI Google Colab™ were close to Agisoft Metashape, showing the potential use of alternative software as a solution in the RE process. These results suggested that AI-based methods could reshape the RE landscape, offering crucial efficiency gains for industries with rapid prototyping and just-in-time product development.
Numerical investigation of heat reduction system in 42110 Lithium-Ion battery packs using cooling plate spacing variations Adhitama, Bima Rakha; Julian, James; Wahyuni, Fitri; Madhudhu, Fathin Muhammad; Armadani, Elvi
Jurnal Polimesin Vol 23, No 6 (2025): December
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i6.7692

Abstract

An efficient thermal reduction system is crucial for ensuring the optimal performance and safety of Electric Vehicle (EV) batteries, notably by maintaining uniform temperature distribution and minimizing the risk of thermal runaway. This study presents a numerical investigation of the thermal behaviour of a liquid-cooled system for a cylindrical Li-ion 42110 battery pack, focusing on the influence of varying cold-plate spacing. Three cold plate configurations with spacing ratios r = 0.78, r = 0.33, and r = 0 were examined, with r = 0.78 corresponding to the most significant separation. The simulation employed a Reynolds-Averaged Navier–Stokes (RANS) model to resolve fluid flow and energy transport, and the heat-generation profile was derived from experimental data. The results show that all cooling configurations substantially reduced the maximum temperature relative to the uncooled case, with the widest spacing (r = 0.78) achieving the most significant average reduction of 19.736%. However, designs with smaller spacing exhibited slightly higher temperatures and reduced uniformity, particularly near the positive pole, where heat concentration is more pronounced. The temperature deviation remained within the acceptable 2% threshold. These findings highlight not only the thermal effectiveness of each spacing ratio but also its design implications, demonstrating that spacing plays a critical role in controlling peak temperature and maintaining uniformity. Overall, the study emphasizes that strategic cold-plate spacing is essential for reliable, efficient, and thermally stable battery operation in EV applications.

Page 51 of 56 | Total Record : 553

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