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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 503 Documents
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Modification of sugarcane bagasse as polymer composite reinforcement via alkalization and benzylation Thalib, Sulaiman; Zakaria, Sarani; Azhari, Che Husna; Muhammad, Ikramullah; Usman, Husni
Jurnal Polimesin Vol 23, No 2 (2025): April
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i2.6404

Abstract

This research evaluates the impact of chemical modification on the thermal, structural, chemical, and mechanical properties of sugarcane bagasse particles for their application as reinforcement in polymer composites, which was conducted through alkalization and subsequent benzylation. Sugarcane bagasse was first mechanically refined, then treated with sodium hydroxide to produce alkalized bagasse (ALC), followed by etherification with benzyl chloride to yield benzylated bagasse (BLC). The untreated and modified particles were characterized using TGA, DSC, XRD, FTIR, and tensile testing. Thermal analysis showed degradation temperaturesof 250 °C, 245 °C, and 240 °C for untreated, ALC, and BLC, respectively. XRD revealed a decrease in crystallinity after treatment, indicating increased amorphous content due to surface modification. FTIR confirmed the replacement of hydroxyl groups with benzyl groups, enhancing hydrophobicity. Mechanical testing demonstrated a significant improvement in the tensile strength and modulus of PA6 composites reinforced with BLC, with the highest values (49.5 MPa and 1224.3 MPa) achieved using 100 µm BLC particles. These results highlight the effectiveness of chemical modification in improving interfacial compatibility and mechanical performance, supporting the use of modified bagasse as a sustainable reinforcement for bio-based composites.
Impact of angle cap and water-filled blade modification on the output of overshot waterwheels Afandi, Rizki Afif; Mugisidi, Dan; Parwatmoko, Giri; Heriyani, Oktarina
Jurnal Polimesin Vol 23, No 2 (2025): April
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i2.6543

Abstract

The utilization of water resources as renewable energy through waterwheels presents an environmentally friendly alternative, however, its efficiency requires improvement through technological modification. This research investigates two design modifications: a 45° Angle Cap (AC) and a Water-Filled Angle Cap (WFAC), in comparison with a waterwheel without a Cap (WC). Experiments were conducted at discharges from 1 to 10 m³/h with a constant torque load of 0.05 N-m. The highest efficiency of 57.08% was achieved in the AC 45° configuration at 1 m³/h, generating 1.09 watts of power, while the WFAC 45° yielded the highest power output of 2.88 watts at 10 m³/h with an efficiency of 14.50%. Although increasing discharge generally led to higher power input, it was accompanied by a decrease in efficiency across all configurations. Among all three variations, WFAC 45° demonstrated superior performance at higher discharges, indicating its potential for enhancing the power and efficiency of overshot waterwheels. 
Ergonomic redesign of transportation fleet driver seats using anthropometric approaches to minimize musculoskeletal disorders Andriani, Meri; Hamdani, Hamdani; Aziza, Nanda Saleysia
Jurnal Polimesin Vol 23, No 2 (2025): April
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i2.4199

Abstract

The operation of public transportation fleets demands competent drivers to ensure passenger safety and operational reliability. Maintaining an optimal driving posture is a critical factor in supporting driver performance; however, mismatches between seat design and driver anthropometry can result in musculoskeletal disorders (MSDs), reducing driver focus and increasing the risk of traffic accidents. This study aims to determine the ergonomic dimensions of driver seats based on anthropometric data. The methodology integrates anthropometric measurements, percentile analysis, statistical validation, and ergonomic modeling utilizing CATIA software. Key anthropometric dimensions considered include sitting upright height (TDT), chin-to-top-of-head distance (DPK), shoulder width (LB), popliteal-buttock length (PPO), popliteal height (TPO), thigh thickness (TP), and hip width (LP). Data uniformity and adequacy tests confirmed the reliability of the dataset, while normality tests verified that the measurements were normally distributed. Subsequent analysis applied the 50th and 95th percentile values to guide design decisions, ensuring broad user accommodation. Ergonomic modeling was conducted using CATIA software to develop an optimized driver's seat. The resulting design specifications include a seat base height of 92.63 cm, headrest height of 21.7 cm, seat width of 62 cm, seat base length of 46.90 cm, seat height from the floor of 44.00 cm, seat base thickness of 15.07 cm, and seat base width of 38.33 cm. These dimensions are intended to support optimal driver posture, reduce the incidence of MSDs, and enhance overall driving safety and comfort in public transportation fleets.
Effect of radiographic film quality on SMAW weld defect detection in SA 240 Gr 316L pressure vessels Khakim, Moh Lukman; H, Rachmad Syarifuddin; S, Hanto; K, Wahyu Dwi; T, Fahniati Sofi
Jurnal Polimesin Vol 23, No 2 (2025): April
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i2.6172

Abstract

This study shows that radiographic film quality significantly affects the accuracy of SMAW weld defect detection in SA 240 Gr 316L pressure vessels. Radiographic evaluations using both the Panoramic and Internal Source Techniques revealed variations in film density, with the Internal Source Technique achieving slightly higher density values (2.78–3.15) than the Panoramic Technique (2.50–2.88). A sensitivity level of 1.66% was achieved, allowing for the identification of slag inclusions (42 mm and 10 mm) and porosity defects (8 mm). Defects exceeding ASME Section V acceptance criteria required re-welding and re-evaluation. Several factors influencing radiographic quality were identified, including radiation source activity, exposure duration, and film processing conditions. Optimizing these parameters is essential for ensuring reliable defect detection and maintaining pressure vessel integrity. Future research could focus on advanced image processing techniques or digital radiography.
Enhanced structural and thermal properties of oil palm frond fiber-derived nanocellulose using chemical and mechanical treatments for eco-friendly composites Randis, Randis; Gapsari, Femiana
Jurnal Polimesin Vol 23, No 2 (2025): April
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i2.6270

Abstract

This study investigates the extraction and characterization of Cellulose Nanofibrils (CNFs) from Oil Palm Frond Fibers (OPFFs) using a combined chemical and mechanical treatment approach. Alkali treatment and bleaching effectively removed non-cellulosic components, increasing the Crystallinity Index (CI) from 58.75% in untreated OPFFs to 73.09% in Chemically Treated Microfibrillated cellulose (CMFs). Subsequent ultrafine grinding further enhanced the CI to 81.93%, demonstrating high purity and improved structural integrity. Thermogravimetric Analysis (TGA) revealed enhanced thermal stability, with the maximum degradation temperature rising from 286°C in OPFFs to 339°C in CNFs. X-ray Diffraction (XRD) analysis confirmed the retention of the cellulose of crystalline structure after all treatments. The novelty of this study lies in the systematic valorization of oil palm frond fibers, an abundant agricultural waste in Indonesia, through an integrated chemical-mechanical process to produce high-performance nanocellulose. These findings demonstrated that OPF-derived CNFs possess superior structural and thermal properties, making them strong candidates for reinforcing eco-friendly polymer composites in sustainable material applications
Development of a sodium chloride (NaCl) eutectic phase change material for fish cold storage applications Risano, Ahmad Yudi Eka; Eriyadi, Riko; Irsyad, Muhammad; Sukmana, Irza; Sugiri, Agus; Saputra, Rizal Adi; Wahyudi, Heru
Jurnal Polimesin Vol 23, No 2 (2025): April
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i2.5547

Abstract

Sustainable marine resource management is essential, as the sea provides a vital source of nutrition for humans. Fish and shellfish are highly perishable, making effective low-temperature storage systems crucial for preserving their quality. This research developed a cold storage system utilizing Phase Change Material (PCM) for low-temperature applications. While water is commonly used as a PCM due to its excellent thermal properties, it is unsuitable for low-temperature applications because of its 0°C freezing point. To overcome this, sodium chloride (NaCl) was introduced as a solute to lower the freezing point, resulting in eutectic salt solutions with 3%, 6%, and 9% weight concentrations. Thermal characterization revealed that the 9% wt. NaCl solution exhibited the most favourable properties, achieving a freezing point of -5.8°C while maintaining a latent heat of fusion comparable to water. Experimental validation demonstrated that 5.6 kg of the 9% NaCl solution effectively maintained 5 kg of fish at approximately 0°C for 24.3 hours, with minimal temperature fluctuation. Organoleptic evaluation yielded a score of 8 at a 95% confidence level, indicating excellent preservation quality. These findings highlight the potential of NaCl eutectic solutions as cost-effective, sustainable alternatives to conventional refrigeration methods for seafood storage.  
Optimizing curing parameters to enhanced the compressive strength and toughness properties of Resin-Coated Sand (RCS) in foundry applications Khoryanton, Ampala
Jurnal Polimesin Vol 23, No 2 (2025): April
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i2.6124

Abstract

Conventional heating methods remain prevalent among small and medium-sized enterprises (SMEs) for aluminum mold thermal regulation during resin-coated sand (RCS) core production. Inconsistent thermal regulation significantly alters the characteristics of resin-coated sand cores. This study aims to investigate the effect of curing parameters on the compressive strength and toughness of the resin-coated sand. The RCS specimens were prepared using an aluminum mold that underwent controlled thermal treatment in an electrical furnace. The thermal treatment is performed by processing specimens across a curing temperature range of 200-300°C and varying curing time from 3 to 15 minutes. HDPE polymer was proposed as the RCS binder. Compressive and impact tests were carried out to determine the characteristics of resin-coated sand. The results showed a non-linear relationship between curing parameters and mechanical properties. Although moderate curing time and higher temperatures initially improve compressive strength and toughness, exceeding optimal thresholds leads to the degradation of these mechanical characteristics. The highest mechanical properties (compressive strength = 38.4 MPa, toughness = 0.43 MPa) are achieved through a curing temperature of 250°C and a curing time of 9 minutes. This study provides valuable insights into determining the optimal parameters for processing resin-coated sand cores or molds with superior compressive and toughness properties.
Analyzing Heat Transfer Variations with Hole Quantities in Multi-Layered Flat-Plate Cooling Towers Thaib, Razali; Syuhada, Ahmad; Perangin-Angin, Alifia Kaneysha; Al Kautsar, Teuku Muhammad Aldine
Jurnal Polimesin Vol 23, No 2 (2025): April
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i2.6064

Abstract

Cooling towers are essential industrial heat exchangers that cool water by exposing it to air, promoting evaporation and subsequent temperature reduction. Despite extensive research on performance enhancement, the optimal design configuration remains uncertain. This study examines the impact of hole quantity and shape on the thermal performance of a multi-layered flat-plate cooling tower. Circular holes in three configurations—80, 120, and 185 holes—were tested at inlet temperatures of 65°C and 75°C. The cooling tower has a total height of 2.4 meters, with each plate measuring 0.7 × 0.5 meters and arranged at a 15° angle. Experimental results show that the highest heat transfer rate occurs at 75°C with 185 holes, while the largest heat transfer coefficient is achieved at 65°C with the same configuration. These findings emphasize the significant role of hole quantity and geometry in optimizing cooling tower performance. The results offer valuable insights for industrial applications, particularly in improving cooling efficiency in power plants and manufacturing processes.
Optimizing copper catalytic converter designs for emission reduction in automatic motorcycles using grey relational analysis Sudirman Rizki Ariyanto; Warju Warju; Komarudin Komarudin; Ata Syifa' Nugraha; Susi Tri Umaroh
Jurnal Polimesin Vol 23, No 2 (2025): April
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i2.6375

Abstract

Vehicle emissions remain a major environmental challenge in urban areas, particularly in developing countries like Indonesia, where motorcycles dominate transportation. Automatic motorcycles pose specific emission control difficulties due to their engine characteristics. This study experimentally evaluates six copper-metallic catalytic converter designs installed on a 150cc automatic motorcycle under idle and 3000 rpm conditions. Exhaust emissions of carbon monoxide (CO) and hydrocarbons (HC) were measured using a gas analyzer. Grey Relational Analysis (GRA) was employed to optimize the design parameters. The E3 design (curvature height: 4 mm, diameter: 54 mm, length: 100 mm) exhibited the best performance, reducing CO to 3.72% and HC to 539 ppm. Compared to standard designs, E3 improved emission reduction by 18–36%. These findings confirm that catalyst geometry significantly influences emission control and demonstrate the effectiveness of GRA in multi-parameter optimization. The results contribute to the development of efficient, affordable catalytic converters, supporting sustainable transportation and aligning with SDG 13 goals for climate action.
Physical and Thermal Properties of MgCl2 mixed with NaCl at Various Ratios for Solar Thermal Energy Storage Application Gunawati, Gunawati; Setiawan, Adi; Syahputri, Riana; Riskina, Shafira
Jurnal Polimesin Vol 23, No 2 (2025): April
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i2.6150

Abstract

Latent heat storage is a system capable of absorbing and releasing heat energy when a material undergoes a phase change. The material often used in this system is referred to as PCM (Phase Change Material). One of commonly used material for heat storage is salt. This type of material was chosen due to its low-cost and better in chemical-physical properties. This study aimed to find out the effect of combining NaCl with MgCl2 on the properties and performance of PCM. For preparation, MgCl2 was added to NaCl followed by manual mixing and grinding to ensure homogeneity. The samples were placed inside the muffle furnace and heated to 600°C. Next, the samples were evaluated for physical properties such as density, specific heat, and thermal conductivity, and tested for charging and discharging performance using a thermal box. The test results suggested that the higher MgCl2 content, the more specific heat capacity and thermal conductivity. However, it is inversely proportional to the density, where the lower the MgCl2 portion, the higher the density value. This caused the rate of thermal energy absorption and energy storage capacity increased significantly

Page 43 of 51 | Total Record : 503

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