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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 24 Documents
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Search results for , issue "Vol 23, No 6 (2025): December" : 24 Documents clear
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.
Investigation of microstructural, mechanical, and electrical characteristics of CuNi5W alloy synthesized by warm compaction Ardiansyah, Agung; Prasetiyo, Bagus; Suprianto, Suprianto; Sitorus, Irfan
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.v23i6.7568

Abstract

In the Electric Discharge Machining (EDM) process, electrode materials require high electrical conductivity and sufficient mechanical strength. These electrodes can be fabricated by the Powder Metallurgy (PM) technique from copper-based alloys. The electrode strength can be improved by adding refractory materials through a properly selected warm compaction parameter, such as temperature and pressure compaction. The study focused on analyzing microstructural changes, compressive strength, hardness, and electrical behavior of the alloy. High-purity (Cu, Ni, W) elements were synthesized by warm compaction with different penetration loads and temperatures to produce CuNi5W alloys. The physical, mechanical, and electrical testing were carried out at room temperature. The results indicate that incorporating tungsten (W) into Cu-Ni-based alloys, combined with higher compaction temperatures and pressures during warm compaction, leads to an improvement in density, hardness, and electrical conductivity. The optimum values for these properties were achieved in the Cu-Ni-W-based alloy compacted at 250°C and 250 MPa. The CuNi5W alloys exhibited a microstructure characterized by a solid solution matrix in which tungsten particles were evenly distributed, playing a key role in enhancing the hardness of the model CuNi5W-based alloy.
Experimental optimization of welding current, strip thickness, and spot number for the mechanical integrity of 18650 lithium-ion battery pack joints Arman, Arman; Jufri, Widya; Nasrullah, Baso
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.v23i6.8270

Abstract

The accelerating transition to renewable energy has driven widespread use of 18650 lithium-ion cells in electric vehicles and portable electronics, making the integrity of resistance spot-welded joints critical for system safety and reliability. This study investigates the effects of material thickness, number of weld points, and welding current on the mechanical performance of spot-welded joints. SPCC nickel strips with thicknesses of 0.10 mm, 0.12 mm, and 0.15 mm were welded to 18650 cells using a CNC-controlled spot-welding machine in three operating modes (7, 8, and 9). The mechanical performance was assessed through shear and peel force tests. The results showed that the welding current and the number of weld points had a dominant influence on the joint load-bearing capacity. Six weld points consistently improved load distribution, while material thickness significantly improved performance, with a 0.15 mm strip producing the highest shear force of 2380 N and a peel force of 2400 N. Optimal performance was achieved at 25 A (Mode 9), where failure occurred primarily in the base metal, indicating a strong metallurgical bond. SEM analysis shows the 0.12 mm thickness produces more homogeneous surfaces with fewer micro-cracks. The results reveal a trade-off between performance metrics, where 0.15 mm achieves higher load-bearing capacity, whereas 0.12 mm offers improved microstructural stability and long-term reliability. Optimizing spot welding parameters is essential for achieving reliable battery interconnections, as increasing the number of weld points enhances mechanical robustness while appropriate current levels improve joint integrity without inducing thermal damage.
The effect of biomass ratio and CaO/Si catalyst on hydrogen production from corncob–wood pellet gasification Suwandono, Purbo; Wijayanti, Widya; Ismail, Nova Risdiyanto; Akbar, Dzulfikar Johan; Pambudi, Wisnu Setyo Catur
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.v23i6.7803

Abstract

Biomass co-gasification combined with catalytic upgrading offers a promising pathway for enhancing hydrogen-rich syngas production. This study investigates co-gasification of corncob and wood pellets in an updraft fixed-bed reactor, integrated with ex-situ CaO/Si catalytic upgrading. Nine experimental runs were conducted by varying the corncob: pellet ratio (1:1–3:1), catalyst loading (6–10 wt% of 80 g biomass), and CaO/Si ratio (1:1–3:1), while reactor geometry, inlet air speed (10 m/s), and run duration (1500 s) were kept constant. The product gas was routed through an ex-situ catalyst bed, cooled in a condenser, and then analyzed using calibrated MQ sensors (H₂, CH₄, CO, CO₂). Gas composition was monitored using calibrated MQ sensors to provide comparative trends among operating conditions. The best performance was observed in Run 7 (50:50 biomass ratio, 10 wt% catalyst, CaO/Si = 2:1), achieving peak H₂ at 8000 ppm and CH₄ at 46,000 ppm, while CO₂ decreased to 16,000 ppm compared with several other runs. This outcome was consistent with CO₂ sorption by CaO, which can shift reactions toward higher H₂ formation (e.g., via the WGS equilibrium), and was supported by downstream upgrading reactions in the hot-gas line. The results suggest that combining biomass blending with ex-situ CaO/Si upgrading can improve the characteristics of hydrogen-enriched syngas within the investigated operating range.Biomass co-gasification combined with catalytic upgrading offers a promising pathway for enhancing hydrogen-rich syngas production. This study investigates co-gasification of corncob and wood pellets in an updraft fixed-bed reactor, integrated with ex-situ CaO/Si catalytic upgrading. Nine experimental runs were conducted by varying the corncob: pellet ratio (1:1–3:1), catalyst loading (6–10 wt% of 80 g biomass), and CaO/Si ratio (1:1–3:1), while reactor geometry, inlet air speed (10 m/s), and run duration (1500 s) were kept constant. The product gas was routed through an ex-situ catalyst bed, cooled in a condenser, and then analyzed using calibrated MQ sensors (H₂, CH₄, CO, CO₂). Gas composition was monitored using calibrated MQ sensors to provide comparative trends among operating conditions. The best performance was observed in Run 7 (50:50 biomass ratio, 10 wt% catalyst, CaO/Si = 2:1), achieving peak H₂ at 8000 ppm and CH₄ at 46,000 ppm, while CO₂ decreased to 16,000 ppm compared with several other runs. This outcome was consistent with CO₂ sorption by CaO, which can shift reactions toward higher H₂ formation (e.g., via the WGS equilibrium), and was supported by downstream upgrading reactions in the hot-gas line. The results suggest that combining biomass blending with ex-situ CaO/Si upgrading can improve the characteristics of hydrogen-enriched syngas within the investigated operating range.

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