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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 527 Documents
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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.
Technical feasibility study of floating solar power for water hyacinth removal in Limboto Lake, Gorontalo Pido, Rifaldo; Libunelo, Rahmat; Boli, Rahmad Hidayat
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.v23i6.7653

Abstract

Limboto Lake in Gorontalo Province has experienced a decline in ecosystem quality due to the massive growth of water hyacinth (Eichhornia crassipes). The presence of water hyacinth reduces lake productivity and disrupts fishing activities. Common control efforts has been mechanical removal of water hyacinth with high cost due to fuel consumption. This study aims to assess the feasibility of utilizing a floating Solar Power Plant (PLTS) as an alternative energy source to power the water hyacinth lifting machine. The methods used in the study include a literature review, field surveys, calculations of engine energy requirements, design of a floating PLTS system, and technical feasibility analysis. The water hyacinth lifting machine requires 12–18 kWh of energy per day, which a floating PLTS system can meet with a capacity of 5 kWp. The findings demonstrate that the proposed floating solar power system is technically feasible for implementation. In addition to supporting the sustainable operation of water hyacinth-lifting machines, this technology also reduces evaporation from lakes and increases the use of renewable energy in Gorontalo.
A hybrid pareto–fishbone and IoT-based monitoring framework for reducing DTY yarn defects Kurnia, Deni; Fakhrurroja, Hanif; Marno, Marno; Joniko, Joniko
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.v23i6.7678

Abstract

Quality Control (QC) challenges in the textile industry increasingly require data-driven and real-time solutions to reduce critical production defects. This research aims to develop a hybrid Pareto-Fishbone analysis integrated with an IoT-based monitoring framework to reduce the incidence of dominant defects in Draw Textured Yarn (DTY) yarns (X-stitch and Broken Filament). Defect data collected in 2024 (n=2,396) and early 2025 (n=1,177) were analyzed using Pareto charts, which identified X-stitch (40.15%) and Broken Filament (37.15%) as contributing 77.3% of total defects in 2024. Fishbone diagrams traced root causes to machine vibration and yarn tension anomalies. An IoT prototype was designed using ADXL345 vibration sensors (200 Hz sampling), tension monitoring, and MQTT communication to a Node-RED dashboard to enable real-time alerts. Preliminary testing achieved 95% MQTT transmission success and detected vibration anomalies correlating with 85% of X-stitch incidents. The proposed hybrid framework combines the diagnostic strength of Pareto–Fishbone analysis with the preventive capability of IoT monitoring, offering a scalable Industry 4.0-oriented solution for textile QC and predictive maintenance.
Effects of feed particle size distribution and chemical properties on roller press performance and comminution efficiency at plants 7 and 8 of PT Indocement Tunggal Prakarsa, Tbk Dewi, Mubarokah Nuriaini; Qurningsih, Dwi; Sandi, Samuel Armawan; Guntama, Dody; Nulhakim, Lukman; Lubena, Lubena; Agustin, Irma
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.v23i6.7423

Abstract

Roller press is a comminution machine that works based on contact force and compression force at high pressure. Several operational constraints, such as hydraulic pressure, can cause the roller press feed to malfunction, leading to performance degradation. This study aims to analyze the effect of material feed characteristics on roller press performance in the finish mill unit of PT. Indocement Tunggal Prakarsa, Tbk. The methods used include Particle Size Distribution (PSD) analysis, free lime test, tricalcium silicate (C3S), and Work Index (WI) testing on samples from clinker plant 7 (P7) and plant 8 (P8). Roller press operational parameters hydraulic pressure, and grinding pressure, were analyzed to spread the impact of particle size distribution on comminution efficiency. The results showed that optimal roller press performance was achieved when the PSD material was evenly distributed with f80 of 12.98 mm and a reduction ratio of 8.16. The specific grinding power required was 5.33 N/mm² with a power consumption of 6.92 kWh/t. In addition, clinker with C3S content of 62.53% and free lime of 1.25% had better grind-ability, with WI value of 12.90 kWh/t, which contributed to a comminution efficiency of 12.50%. The conclusion of this study is that the particle size distribution of feed material greatly affects the operational parameters of roller press and energy efficiency. Material with more even size distribution and better grind-ability results in more effective comminution performance and lower energy consumption, which has implications for improving the efficiency of grinding process in the cement industry.
Experimental evaluation of the thermal and exergy performance of a flat spiral-tube receiver for a parabolic dish collector Yonanda, Ahmad; Junidy, Muhammad Raihan; Irsyad, Muhammad; Amrizal, Amrizal; Harmen, Harmen; Kurniawan, Dondi; Prabowo, Angga Darma
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.v23i6.7557

Abstract

Global dependence on fossil fuels continues to drive the search for cleaner, more sustainable energy sources. One promising technology is the Parabolic Dish Collector (PDC), harnessing concentrated solar energy. The receiver in a PDC is pivotal to overall thermal efficiency and useful energy output. This study evaluates the thermal and exergy performance of a manufactured flat spiral-tube receiver designed to enhance heat transfer. Experiments were conducted under tropical condition between 10:00 and 14:00 local time at three volumetric flow rates (0.5, 0.8, and 1.1 LPM). The 0.5 LPM flow rate yielded the best performance, with a fluid temperature rise up to 43.8°C, a thermal efficiency of 39.1%, and a peak exergy efficiency of 1.1%. The spiral geometry improved fluid residence time, enabling more effective heat absorption. These findings demonstrate that a simple, manufactured spiral tube receiver can improve PDC performance, offering an efficient and cost-effective solution for solar thermal systems.
Effect of water pressure and temperature on the perform-ance of a desalination reactor Dwibowo, Dany Alvian; Mugisidi, Dan; Heriyani, Oktarina; Alamsyach, Rizky; Amin, Syahrul
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.v23i6.7867

Abstract

The crisis of clean water availability has become increasingly critical due to rapid population growth and environmental degradation. One strategic approach to address this challenge is to implement seawater desalination, which provides an abundant, sustainable water source. However, conventional methods remain limited in terms of energy efficiency. This study aims to analyze the effect of pressure and temperature variations on the performance of a large-capacity desalination reactor with an 8000-liter tank. Two configurations were experimentally tested: (1) an air-circulation system that relies on static heating assisted by an axial fan to enhance convection, and (2) a sealed system operating under low-pressure conditions to reduce the boiling point of water, equipped with active hot-water circulation. Data collection was carried out over 27 hours of operation, with the observed parameters including water temperature, partial pressure, relative humidity, and evaporation volume. The experimental results showed that the sealed configuration delivered superior performance, with an evaporation rate 16.64% higher than that of the air-circulation variant. The volume of water successfully evaporated in the sealed system reached 20.12 liters, whereas in the air-circulation system it was only 17.25 liters. This increase in efficiency is attributed to the pressure-reduction effect, which enhances the vapor pressure difference while facilitating uniform heat distribution through active water circulation. This study emphasizes that controlling pressure and temperature is key to improving the effectiveness of the desalination process, thereby supporting the Development of more energy-efficient and sustainable clean water supply technologies.
Enhancing production effectiveness of the K-58 crankcase machining line through integrated TPM–FMEA approach Sinaga, Zulkani; Sinaga, Jhonni
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.v23i6.8231

Abstract

On the Crankcase K-58 machining line, several performance gaps were identified, including inconsistent cycle time, frequent unplanned downtime, and tool-change irregularities that caused the output to fall below the company targets. This study aims to enhance the production effectiveness of the K-58 crankcase machining line by applying an integrated Total Productive Maintenance (TPM) and Failure Mode and Effects Analysis (FMEA) approach. The initial performance evaluation, using Overall Equipment Effectiveness (OEE) in 2024, showed an average score of 76.2%, indicating significant losses in availability and performance rates. Quantitative analysis was conducted through OEE and Six Big Losses assessments, while FMEA was used to prioritize failure points based on Risk Priority Number (RPN). Improvement actions implemented included autonomous maintenance reinforcement, scheduled preventive maintenance, operator skill development, coolant-condition control, and quick-change adjustments. After implementation, OEE of the machining line increased to 85.5%, meeting the its target. Reduced speed losses improved by more than 45%, while setup and adjustment losses decreased by over 50%. These results confirm that the integrated TPM–FMEA approach is effective for enhancing machining-line performance and reliability.
Investigation of the effects of fused deposition modeling process parameters on the dimensional accuracy of PLA+ using the Taguchi method Pristiansyah, Pristiansyah; Yunus, Muhammad; Meri, Andi; Afriansyah, Soni
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.v23i6.7754

Abstract

Dimensional accuracy is a crucial aspect of 3D printing technology based on Fused Deposition Modeling (FDM), as deviations from the intended dimensions may lead to product malfunction and difficulties in component assembly. Such inaccuracies are generally influenced by various process parameters during 3D printing. This study aims to evaluate the effects of four main FDM parameters layer height, infill density, print speed, and nozzle temperature on the dimensional accuracy of printed parts using PLA+ material. The primary focus of this research is to enhance dimensional accuracy. To achieve this objective, the Taguchi design of experiments method was employed, offering a structured and efficient approach to optimizing process parameter settings while minimizing the required number of experiments. An L27 orthogonal array matrix was selected to analyze the influence of parameters at three levels. Based on the analysis of signal-to-noise (S/N) ratios and response data, the optimal parameter combination was identified as follows: layer height of 0.1 mm, infill density of 100%, print speed of 40 mm/s, and nozzle temperature of 210°C. Confirmation tests with these settings demonstrated a significant improvement in dimensional accuracy, with average measurements of 11.73 mm on the X-axis, 7.08 mm on the Y-axis, and 21.08 mm on the Z-axis. These results confirm that the selected parameter configuration is capable of ensuring dimensional stability and consistency.

Page 52 of 53 | Total Record : 527

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