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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 26 Documents
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Search results for , issue "Vol 24, No 1 (2026): February" : 26 Documents clear
Enhancement of thermal stability and corrosion resistance of palm oil lubricants using nonylphenol and polyethylene glycol additives Buwono, Haris Puspito; Ananda Kirana, Aquilla Elka
Jurnal Polimesin Vol 24, No 1 (2026): February
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v24i1.7454

Abstract

Palm oil offers advantages as a lubricant due to its eco-friendliness, renewability, high viscosity index, good boundary lubrication properties, and compatibility with additives. However, palm oil is not very resistant to high-temperature changes, which limit its application in vehicle lubricants. This research aims to overcome the weaknesses of palm oil as a vehicle lubricant by adding Nonylphenol and Polyethylene Glycol surfactants at varying concentrations and evaluate thermal stability, engine operating temperature, and corrosion resistance.  The quantitative experiments were conducted with palm oil blend of nonylphenol surfactant and polyethylene glycol. Formulations containing 2.5%, 5%, and 7.5% surfactant concentrations were evaluated through oven-based thermal stability testing and copper strip corrosion testing according to ASTM D4048 to determine the sulfur content in lubricating oils. From the test results, palm oil-based lubricant blends containing Nonylphenol (2.5% and 5%) and Polyethylene Glycol (PEG) (2.5% and 5%) showed a corrosion classification value of 1a, the best rating in the ASTM Copper Strip Corrosion Standard. The best engine temperature test was palm-oil-based with 5% Nonylphenol.
Thermal performance of desiccant-integrated and conventional Maisotsenko cooling systems in a high humidity tropical climate Irfansyah, Haiqal; Sofyan, Sarwo Edhy; Razali, Razali
Jurnal Polimesin Vol 24, No 1 (2026): February
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v24i1.7392

Abstract

Tropical regions are characterized by a distinctive climate, marked by consistently high temperatures and significant humidity throughout the year. These conditions necessitate the use of cooling systems to ensure thermal comfort. Previous studies have shown that the Maisotsenko cooling system experiences a decline in efficiency when operating in high-humidity environments. Conversely, desiccant systems are effective in reducing air humidity. This study aims to design and experimentally evaluate the performance of a Maisotsenko cooling system under high-humidity tropical conditions, as well as the effect of integrating a desiccant system on its cooling efficiency. The experiments were conducted using a laboratory-scale fabricated test rig, consisting of a Maisotsenko cooling unit with a channel length of 180 mm and a desiccant unit with a channel length of 140 mm. Tests were performed using a standalone Maisotsenko system and a combined Maisotsenko-desiccant system. Air velocity was varied at 3 m/s, 4 m/s, and 5 m/s, with an air ratio of 0.5. The results showed that for the Maisotsenko system without a desiccant, the best cooling performance under high humidity conditions occurred at an air velocity of 3 m/s, achieving a temperature reduction of 1.7°C, a heat transfer rate of 1.4 W, a dew point temperature effectiveness of 27.5%, and a wet-bulb temperature effectiveness of 37.3%. In contrast, the combined system with a desiccant at 3 m/s provided enhanced temperature reduction, dew point effectiveness, and wet-bulb effectiveness of 2°C, 32.4%, and 43.8%, respectively. The highest heat transfer rate, however, was recorded at 5 m/s with a value of 1.9 W. The integration of a desiccant system significantly improved the cooling performance of the Maisotsenko system in terms of temperature reduction, heat transfer rate, and cooling efficiency. At air velocities of 3 m/s, 4 m/s, and 5 m/s, the cooling performance increased by 17.6%, 78.9%, and 366.7%, respectively.
Experimental analysis of process parameters in semi-automatic blow molding of PET bottles: a case study at Universitas Negeri Malang product Riyanto, Obaja Eden Sentosa; Tsamroh, Dewi Izzatus; Wandoyo, Ilham Akbar; Pancayudha, Den Arsyah Pilar; Faidillah, Hikmal
Jurnal Polimesin Vol 24, No 1 (2026): February
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v24i1.8192

Abstract

This research aims to analyze the effects of key process parameters on product quality and defects in the semi-automatic blow molding of Polyethylene Terephthalate (PET) bottles at Malang State University (UM). The background of this study stems from the increasing demand for high-quality PET packaging and the limited number of direct experimental studies on semi-automatic machines, with a limited number of tests. Most previous studies have emphasized model-based simulation and optimization, while practical studies that observe the relationship between process parameters and defect characteristics remain rare. Unlike simulation-based studies, this work is based on direct field experiments under stable, industry-relevant machine settings to evaluate product quality and production readiness for mass manufacturing. The research method was conducted through direct experiments using 12.5 g PET preforms and a 330 mL capacity two-cavity mold. The main variables tested included preform temperature (70°C and 80°C), blow delay time (0.30–0.50 s), and low-blow duration (0.20–0.50 s). Bottle quality was evaluated based on thickness measurements, dimensions, and visual analysis of defects such as wrinkles, collapses, and wall irregularities. The results showed that a preform temperature of 80 °C and a low-blow duration of 0.50 s produced bottles of the highest quality, characterized by uniform wall thickness, flat bases, and minimal defects. In contrast, low-temperature settings (70 °C) resulted in high viscosity, leading to deformation and wrinkles. This optimal combination of parameters was proven to improve bottle structure homogeneity and reduce dimensional shrinkage to 1%. This study emphasizes the importance of temperature and blow time control in achieving stable, efficient, and mass-oriented PET bottle production, while strengthening the role of universities in experimental manufacturing applied research.
Multi-objective tribological and energy optimization of an automatic valve lapping machine using a hybrid RSM NSGA-II approach Setyawan, Reinaldi Teguh; Muthoriq, Ery; Syahrizal, Syahrizal
Jurnal Polimesin Vol 24, No 1 (2026): February
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v24i1.8454

Abstract

Optimizing valve seat reconditioning requires balancing sealing performance, surface integrity, energy consumption, and component wear within practical workshop constraints. This study presents the design, development, and multi-objective optimisation of a low-cost automatic valve lapping system using a hybrid Response Surface Methodology (RSM) and Non-dominated Sorting Genetic Algorithm II (NSGA-II) framework. A prototype automatic valve lapping rig was developed by integrating a DC-motor-driven spindle with adjustable spring loading and an Arduino-based control and data-acquisition system, enabling controlled variation of spindle speed (300–600 rpm) and axial load (60–140 N). Leakage time, surface roughness (Ra), electrical energy consumption, and valve wear volume were measured using a three-level factorial design. Quadratic response surface models with satisfactory statistical adequacy were established for all responses. The RSM models were employed in NSGA-II to maximise leakage time and minimise surface roughness, energy consumption, and wear, subject to practical operational constraints. The optimisation results reveal clear trade-offs between sealing quality, energy efficiency, and component life, and identify an optimal operating window of approximately 430–470 rpm and 90–110 N, providing a robust compromise solution and a practical operating map for workshop valve seat reconditioning.
Effect of anode–cathode distance and anodizing time on hardcoat anodizing of AA7075 Endramawan, Tito; Haris, Emin; Rohmat, Yusup Nur; Irawan, Candra
Jurnal Polimesin Vol 24, No 1 (2026): February
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v24i1.6194

Abstract

Fishing activities in Indramayu ( a seaside city in West Java) typically use boats powered by propellers. These propellers often strike floating objects, resulting in damage such as cracked or broken blades. A survey revealed that the fractures are mainly caused by the poor quality of propellers produced using the gravity casting technique, which results in rough surfaces with pores and cracks that initiate during finishing. Therefore, surface repair is necessary, and one potential method is hardcoat anodizing. This study aims to investigate the effect of coating time and anode–cathode distance on the hardness of the oxide layer formed during the hardcoat anodizing process of AA7075 aluminum alloy. The anode–cathode distances were 5 cm, 10 cm, and 15 cm, with coating times of 40, 50, and 60 minutes. The process was conducted at 2 to 3°C, with a current of 5.12 A and a voltage of 31.5 V. The results of micro-Vickers hardness testing, conducted with a loading parameter of 200 gf and an indentation time of 15 seconds, indicated a hardness increase of 256% compared to the base material. The highest hardness value was achieved at a distance of 5 cm and a coating time of 60 minutes, measuring 322.9 VHN, with a resulting layer thickness of 67.16 µm.
Predictive modeling of surface roughness and resultant force in CNC turning of AISI H13 using optimized artificial neural networks Sunardi, Sunardi; Zain, Ananda Nur Daffa
Jurnal Polimesin Vol 24, No 1 (2026): February
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v24i1.7558

Abstract

Artificial Neural Networks (ANNs) have gained increasing attention as effective tools for modeling nonlinear and multivariate relationships in complex manufacturing processes, where conventional predictive approaches often exhibit limited accuracy. In this study, an ANN-based predictive framework was developed to estimate surface roughness (Ra) and resultant force (F) in CNC turning of hardened AISI H13 steel. The framework was constructed using an experimental dataset comprising 324 machining records, with cutting speed (vc), feed rate (f), and depth of cut (ap) as input parameters, all normalized using the Min-Max scaling method to ensure stable and efficient model training. To identify the optimal training configuration, eight optimization algorithms: Adam, RMSprop, Nadam, Adagrad, Adadelta, Adamax, FTRL, and Stochastic Gradient Descent (SGD) are systematically evaluated, and Nadam was selected as the most effective optimizer with a learning rate of 0.0001 and a batch size of 16. Two dedicated feed forward ANN models are designed separately for Ra and F prediction and validated using the Leave-One-Out Cross-Validation (LOOCV) technique to enhance generalization and minimize overfitting. The resulting models achieved excellent predictive accuracy for resultant force (R² = 0.9939, MAE = 4.3313 N, RMSE = 7.5955 N) and moderate accuracy for surface roughness (R² = 0.6454, MAE = 0.1440 µm, RMSE = 0.1960 µm). These results demonstrate that the proposed ANN-based framework provides a reliable decision-support tool for process optimization, monitoring, and surface quality control in high-performance machining environments.
Experimental Investigation Of MQL Turning Parameters On Surface Quality And Tool Wear Toward Green Machining Practices Gobel, E'ep Fadil Abdilah; Rismanto, Muhammad; Selleng, Kristian; Sirajuddin, Awal Syahrani; Iskandar, Iskandar; Asmara, Anjar
Jurnal Polimesin Vol 24, No 1 (2026): February
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v24i1.8327

Abstract

This study aims to determine the effect of spindle speed and air pressure on surface roughness and tool wear in the turning process of S45C steel using the Minimum Quantity Lubrication (MQL) system with used cooking oil as an environmentally friendly alternative cutting fluid. The spindle speed was varied at 800, 1000, and 1200 rpm, while the air pressure was set at 1, 2, and 3 bar. The experiments were carried out on a conventional lathe machine with controlled variables including the S45C workpiece material, a feed rate of 0.017 mm/rev, a depth of cut of 0.5 mm, and the use of a carbide insert tool. The dependent variables observed were surface roughness and tool wear. The results show that the application of the MQL system significantly reduced surface roughness and slowed down tool wear compared to dry cutting. The lowest surface roughness value was obtained at a spindle speed of 800 rpm and an air pressure of 2 bar under MQL conditions, while the highest tool wear occurred at 800 rpm and 1 bar without MQL. An air pressure of 2 bar provided the best balance between lubrication and cooling effects, maintaining the stability of the lubricant in the cutting zone. The combination of MQL at 2 bar air pressure and 800 rpm spindle speed proved effective in producing a smoother surface finish, extending tool life, and supporting green manufacturing practices through the utilization of used cooking oil as an eco-friendly alternative cutting fluid.
Structural strength analysis of a tourist minicar knuckle using finite element analysis Hanafi, Agung Fauzi; Umar, Mega Lazuardi; Prasetya Dharma Yudha, I Gusti Ngurah Agung Satria; Siregar, Ansor Salim
Jurnal Polimesin Vol 24, No 1 (2026): February
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v24i1.8194

Abstract

The design of components for vehicles used in tourist areas must be efficient, safe, and economical. The steering knuckle is a vital component in the vehicle's suspension and steering systems, playing a crucial role in transferring loads, connecting the wheel to the steering mechanism, and supporting braking components. This research aims to design, analyze, and fabricate a steering knuckle for a mini tourist car with a total mass of 300 kg using plain carbon steel. The design and strength analysis were evaluated using the open-source Finite Element Analysis (FEA) software PrePoMax to investigate stress distribution, deformation, and the factor of safety. The FEA results showed a maximum Von Mises stress of 86.27 MPa, well below the material's yield strength, a maximum deformation of 0.126 mm, and a minimum safety factor of 2.72, confirming a robust design. The component was designed to accommodate a 30204 tapered roller bearing. The fabrication process, encompassing cutting, machining, and welding, successfully produced a functional prototype validated through direct installation and load testing on the vehicle. This study confirms that plain carbon steel is a reliable and economical material for structural components in lightweight vehicle applications and provides a pragmatic engineering framework for developing cost-effective automotive components.
Experimental study on the effect of coal composition on the activation energy of sponge iron reduction Sabuki, Sabuki; Khairil, Khairil; Sofyan, Sarwo Edhy
Jurnal Polimesin Vol 24, No 1 (2026): February
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v24i1.7540

Abstract

The increasing demand for steel in Indonesia necessitates the development of efficient and sustainable ironmaking technologies. Direct reduction has emerged as a promising alternative to conventional blast furnace processes due to its lower operating temperature and reduced carbon emissions. This study examines the effect of coal composition on the reduction kinetics and activation energy of iron ore briquettes produced from locally sourced raw materials. Briquettes were prepared using Lhoong iron ore (93.88 wt% Fe2O3), sub-bituminous coal from Nagan Raya, and natural rubber latex as a binder. Four composition ratios were investigated: 80:15:5, 75:20:5, 70:25:5, and 60:35:5 (iron ore:coal:binder), each with a total mass of 60 g. Reduction experiments were conducted at 800 °C, 900 °C, and 1000 °C in an LPG-fired furnace. Mass loss was continuously monitored at 2-minute intervals using a digital balance connected to data acquisition software.
Effectiveness of TiO2-coated stainless steel mesh reactor with UV-LED on the reduction of cigarette smoke pollutants in a closed room Dewi, Renita; Adhi, Pribadi Mumpuni; Nufus, Tatun Hayatun
Jurnal Polimesin Vol 24, No 1 (2026): February
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v24i1.7586

Abstract

Indoor air pollution, particularly from cigarette smoke, contains harmful Total Volatile Organic Compounds (TVOC) that poses significant health risks. This study aims to evaluate the effectiveness of a Photocatalytic Oxidation (PCO)-based air purification system utilizing a Titanium Dioxide (TiO2)-coated stainless steel mesh reactor and Ultraviolet Light Emitting Diode (UV-LED) sources at 365 nm and 390 nm wavelengths. The methodology involved synthesizing TiO2 sol and immobilizing it onto a stainless steel 304 mesh substrate via a dip-coating technique. Performance testing was conducted in a closed room (volume approx. 136 m³) where smoke from two cigarettes was introduced as the pollutant source. TVOC concentrations were monitored every 5 minutes at five distinct measurement points (center and corners) over a 2-hour period to assess spatial distribution and degradation performance. The results demonstrated that the PCO system with a 365 nm UV-LED reduced the average TVOC concentration from 0.78 ppm to 0.33 ppm, achieving a reduction rate of 57.69%. Meanwhile, the 390 nm UV-LED system decreased the concentration from 0.86 ppm to 0.32 ppm, corresponding to a 62.8% reduction. While the difference in UV-LED wavelength did not significantly alter the photocatalytic performance, light intensity and initial pollutant concentration were found to influence the degradation rate. Overall, the TiO2-coated stainless steel mesh reactor proved to be an effective solution for reducing indoor cigarette smoke pollutants.

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