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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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Design and development of a solar energy-based egg incubator using the quality function deployment (QFD) method with an automatic sliding rack Silitonga, Muhammad Prasha Risfi; Muklas, Muchamad Wali; Prakoso, Muhammad Azhar; Adhi, Pribadi Mumpuni; Maladzi, Radhi
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.v23i5.7541

Abstract

This research focuses on the design and development of a solar-powered egg incubator specifically for free-range chickens, incorporating an automated sliding rack mechanism. One of the main issues encountered by poultry farmers is the inconsistency of electricity supply and the uneven distribution of heat within conventional incubators, both of which contribute to low hatch rates. To address this, the study employed the Quality Function Deployment (QFD) methodology alongside the House of Quality (HOQ) framework to systematically convert user requirements into engineering specifications. Primary data were gathered through Focus Group Discussions (FGD) with poultry practitioners, followed by experimental evaluations concerning thermal distribution performance and the reliability of the solar-powered backup system. Findings demonstrate that the integration of the automated rack and solar panel system resulted in a full (100%) hatching rate, with a stable incubation temperature maintained within the optimal range of 37 to 40°C. Additionally, the solar energy system ensured uninterrupted operation for approximately 7 hours in the event of a power outage. This technological innovation offers a sustainable, eco-friendly solution that holds the potential to significantly boost the productivity of local poultry farming.
Analysis of working posture of coffee bean milling operators to reduce musculoskeletal disorder risks using the OWAS and REBA method Mutia, Mutia; Iqbal, MT, Mohd; Hasanuddin, Iskandar
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.v23i5.7184

Abstract

Repetitive work involving lifting heavy loads over long distances and non-ergonomic working postures can lead to musculoskeletal disorders (MSDs). This problem is commonly found in coffee factories, particularly during the coffee bean grinding process, where two main activities are performed: the first is taking coffee beans from the ground, and the second is lifting the coffee beans to the grinding machine. The task of taking coffee beans from the ground involves a bent posture to collect them from a non-ergonomic coffee storage box. Meanwhile, in the task of lifting the beans to the grinding machine, workers must carry 25 kg of coffee over a distance of 8 meters. The purpose of this study was to evaluate work posture using the Ovako Working Posture Analysis System (OWAS) and Rapid Entire Body Assessment (REBA) methods. Six operators were observed at the coffee bean grinding station. The results show that three operators who perform the task of collecting beans from the ground received a category 3 score using the OWAS method, indicating that corrective action should be taken as soon as possible. In the task of lifting beans to the grinding machine, three operators received a score of 4 according to the OWAS method, also indicating that immediate corrective action is necessary. Based on the REBA method, three operators scored 10, classified as a high-risk level (action level 3), while the other three scored 11, indicating a very high-risk level. Based on these findings, it is necessary to provide ergonomic coffee storage boxes that accommodate workers’ posture in coffee factories and are easy to move according to the workers’ needs, to reduce the risk of musculoskeletal disorders.
Investigation of surface roughness in turning AISI 1020 steel using minimum quantity lubrication (MQL) with recycled cooking oil Rismanto, Muhammad; Sirajuddin, Awal Syahrani; Hair, Jumaddil; Hidayat, Hidayat; Yandi, Yandi; Rozy, Fachrul
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.v23i5.7699

Abstract

This study investigates the influence of the Minimum Quantity Lubrication (MQL) technique and spindle speed on the surface roughness of AISI 1020 steel during turning operations. recycled cooking oil was utilized as an environmentally friendly MQL lubricant, offering potential as a substitute for conventional mineral oils. In this experiment, two independent variables were considered: the lubrication condition (MQL and dry cutting) and spindle speed, which was tested at three levels (630 rpm, 800 rpm, and 1000 rpm). The dependent variable was surface roughness. MQL was selected due to its ability to enhance cooling and lubrication efficiency while minimizing environmental impacts. Experimental results indicated that at a spindle speed of 1000 rpm, surface roughness achieved 2,221 µm with MQL, compared to 2,824 µm without MQL. These findings highlight that recycled cooking oil-based MQL significantly improves the surface finish and demonstrate that the proper combination of lubrication parameters and spindle speed enhances machining quality. Moreover, this research supports sustainable manufacturing by promoting the use of Recycled Cooking Oil as a green lubricant alternative.
Investigation of geometric effects on fluid viscosity using the falling ball method Akhyan, Amnur; Ma’a, Mustaza; Irdam, Fortinov Akbar; Alvarez, Alvin; Nugraha, Nurcahya; Nurkhamdi, Nurkhamdi
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.v23i5.7347

Abstract

The falling ball method, based on Stokes law, is a simple yet accurate technique for determining fluid viscosity, though its precision is influenced by factors such as wall, Reynolds, end, memory, and off-center effects. This study aims to determine the effect of spherical geometry on the fluid viscosity value represented by the sphericity factor . An experimental study was conducted to examine its accuracy of viscosity values to produce the correction factor. The sphericity factors studied were 0.993, 0.976, and 0.949. To reduce the uncertainty caused by the wall effect, the ratio db/Dt was 0.071, using a 5.8mm diameter plastic ball and SAE 40 oil fluid at 32.4°C. Terminal velocity (??) was obtained by analyzing the video of the ball falling in the fluid, which was displayed on the tracker software. The video was taken using a 1080p, 60 fps camera. Wall and Reynolds effect correction factors were used to amend experimental viscosity values. The result indicates the viscosity will be accurately determined by selecting a larger sphericity value of the ball during the experimental process. It will reduce the necessity of correction factors to obtain the value of fluid viscosity.
Experimental study on the tensile and compressive properties of local bamboo fiber polyester composites with varying fiber species and resin ratios Adlie, Taufan Arif; Arif, Zainal; Kamil, Syahiir; Maidin, Maidin; Hasmi, Farhan; Rizal, Teuku Azuar
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.v23i5.7800

Abstract

In response to the growing demand for eco-friendly materials, natural fibers have gained increasing attention as renewable alternatives for automotive and structural materials. Despite extensive research, the mechanical performance of locally sourced bamboo species from Langsa, Aceh, including Gigantochloa apus (apus), Bambusa vulgaris (yellow), and Bambusa blumeana (thorn) remains largely unexplored. This study investigates the tensile and compressive properties of composites reinforced with these three bamboo species. The composites were fabricated using the hand lay-up method using BTQN 157 polyester resin and varying resin-to-fiber ratios of 60:40, 70:30, and 80:20. Mechanical tests were conducted in accordance with ASTM standards to evaluate the influence of bamboo species and fiber composition. Three specimens were tested for each composition, and the results were averaged to ensure data reliability. The results show that both bamboo type and resin fiber ratio significantly affect mechanical performance. The thorn bamboo composite at a 60:40 resin-to-fiber ratio exhibited the highest tensile strength of 81.94 MPa and compressive strength of 9.11 MPa. A 29.67% increase in tensile strength was achieved when varying the resin-to-fiber ratio from 80:20 to 60:40 for yellow bamboo, while a 28.93% improvement was observed across different species. Similarly, a 44.40% rise in compressive strength occurred for apus bamboo composites when the ratio changed from 80:20 to 60:40, and a 54.68% enhancement was recorded across species. These findings confirm that Langsa’s local bamboo, particularly B. blumeana at a 60:40 ratio, offers strong, lightweight, and sustainable reinforcement potential for next-generation composite materials.
Biodiesel synthesis from used cooking oil via esterification-transesterification using jackfruit derived waste solid catalysts Mulkan, Andi; Abd, Misswar; Kamarullah, Kamarullah
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.v23i5.7614

Abstract

The search for renewable and sustainable energy sources has heightened the significance of biodiesel. However, conventional production methods often rely on costly chemical catalysts that produce harmful waste, which this study addresses by introducing a low-cost, recyclable solid catalyst derived from abundant jackfruit peel waste in Indonesia. The novelty of this work lies in transforming underutilized biomass into a functional catalyst that improves both environmental sustainability and economic feasibility. Jackfruit peel was processed through cleaning, drying, grinding, open-air burning, and calcination at 500 °C for 120 minutes. The resulting material exhibited significant catalytic activity, with characterization confirming the presence of carbonates and metal oxides, particularly potassium (42.1%). Optimization of the transesterification reaction was carried out using a 1:9 molar ratio of oil to methanol, 12% catalyst loading, and a reaction temperature of 65 °C for 105 minutes. Under these conditions, the catalyst achieved a biodiesel yield of 98.9%. The produced biodiesel met the Indonesian National Standard (SNI 7182:2015) for key physicochemical properties. This research highlights the potential of agricultural waste as a sustainable catalyst source, offering an effective pathway toward cleaner biodiesel production and supporting circular economy practices in renewable energy development.
Chemical treatments' effect on the structural and mecha-nical properties of polyvinyl alcohol/spent coffee ground composite films Muhibbuddin, Muhibbuddin; Ilham, Farid; Muhammad, Ikramullah; Rizal, Samsul
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.v23i5.7204

Abstract

Chemical treatments are a common strategy for improving the compatibility of natural fillers with polymer matrices. However, their specific impact on Spent Coffee Grounds (SCG) as reinforcement for Polyvinyl Alcohol (PVA) composites remains unclear. This study investigates the effects of alkalization, bleaching, and acid hydrolysis on the structural and mechanical properties of PVA/SCG composite films. The SCG was treated with 10% NaOH, 10% NaOCl, and 1 M H₂SO₄. FTIR analysis showed that untreated SCG exhibited characteristic C–H stretching peaks at 2922 cm⁻¹ and 2853 cm⁻¹, corresponding to methyl and methylene groups in cellulose and hemicellulose. After alkalization and bleaching, these peaks nearly disappeared, indicating excessive removal of hemicellulose and lignin and suggesting structural degradation of the filler. In contrast, acid hydrolysis largely preserved these peaks, reflecting milder structural modification. Mechanical testing confirmed this trend: the untreated composite achieved the best performance, with tensile strength of 2.30 MPa and tear resistance of 2.12 N All chemically treated samples showed reduced strength and toughness, with alkalization being the most detrimental. These findings demonstrate that the decline in mechanical properties is directly correlated with structural damage detected by FTIR, emphasizing the need to optimize treatment severity.
Tracking solar panel maximum power point using IoT-based mamdani fuzzy logic control Nuryanti, Nuryanti; Erdani, Yuliadi; Subekti, Ruminto; Purnomo, Wahyudi; Indrajaya, Nathan; Badia, Bahdin Ahad
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.v23i5.7709

Abstract

Renewable energy is an important solution to overcome the limitations of conventional non-renewable energy. The role and breakthroughs in using renewable energy are one of the research priorities that need to be developed and get more attention. Solar panels are one of the technologies in utilizing this energy source. However, with all the benefits of solar panels, the biggest challenge currently faced is the energy conversion system which still experiences fluctuations in output power due to unpredictable changes in solar irradiance, especially when covered by clouds. To overcome this problem, an effective Maximum Power Point Tracker (MPPT) system is needed. MPPT has feature limitations based on price, this is what drives the creation of an MPPT that is easy to develop. This study proposes the use of fuzzy logic methods in MPPT to determine the maximum point that needs to be achieved by solar panels. This study applies the INA226 sensor which is used to take data from solar panels, which is then processed into input to control MPPT by considering fuzzy conditions to maintain optimal power output. This research produces the final result in the form of a constant voltage required by the battery to fulfill the core function of SCC where the output is optimal through adjustment of the work cycle, so this research is expected to make data on solar panels easy to obtain and analyze with MPPT which can be developed in the future. The research can be considered as novel due to the implementation of fuzzy logic to determine control parameters
Waste cooking oil biodiesel via a sodium hydroxide-catalyzed transesterification process: effects on diesel engine performance and emissions Hamid, Abdul; Syafa, Muhammad Badrus; Fatah, Misbakhul; Jakfar, Amin; Rahmawati, Zeni; Purbaningtias, Tri Esti; Fikri, Mohammad Anas; Rohmah, Faizatur; Wilujeng, Auliana Diah
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.v23i5.7374

Abstract

This study reports the synthesis of biodiesel from locally sourced Waste Cooking Oil (WCO) using sodium hydroxide (NaOH) catalyst. The main objective of this research is to assess the feasibility of utilizing WCO-based biodiesel as a sustainable alternative fuel by analyzing its physicochemical properties and application in a Yanmar® TF 70 LY-DI diesel engine. The production process involved degumming, acid-catalyzed esterification, and base-catalyzed transesterification to address the high free fatty acid content of WCO. The resulting biodiesel met ASTM D6751 standards, with a kinematic viscosity of 5.06 cSt, a flash point of 164°C, a density of 885 kg/m3, a FAME yield of 98.17%, and an acid number of 0.12 mg-KOH/g. Engine tests were performed using blends from B10 to B40 and benchmarked against pure diesel. Results showed that B10 and B20 blends maintained comparable engine performance, while higher blends (B30–B40) exhibited reductions in power and torque and increased Specific Fuel Consumption (SFC). CO emissions decreased significantly with increasing biodiesel content, whereas NO and NOx emissions rose due to higher combustion temperatures. These findings demonstrate the technical feasibility and environmental benefits of WCO-derived biodiesel, particularly at lower blend ratios (≤ B20), as a locally available and sustainable fuel. The study is limited to laboratory-scale testing on a single-cylinder engine without long-term durability assessments, which should be addressed in future studies.
Impact of spindle tilt and machining parameters on surface roughness in milling Romiyadi, Romiyadi; Febrianton, Adi
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.v23i5.7258

Abstract

This study aims to analyze the influence of spindle tilt and machining parameters (feed rate, depth of cut, and spindle speed) on surface roughness in milling operations using a Knuth UFM 2 universal milling machine. A parametric experimental approach was used, where parameters were varied systematically to assess their influence on surface quality. Results show that increasing spindle tilt, feed rate, and depth of cut generally raises surface roughness, while higher spindle speeds reduce it, producing smoother surfaces. The optimal surface quality was achieved during the first up-milling test with a spindle inclination of 30°, feed rate of 108 m/min, spindle speed of 720 rpm, and depth of cut of 0.50 mm, yielding a surface roughness (Ra) of 0.258 µm. In contrast, higher tilt angles and cutting loads significantly degraded surface finish, with roughness increasing by up to 95.91% when spindle tilt was raised from 30° to 60°, by 52.86% when depth of cut increased from 0.50 mm to 1.50 mm, and by 79.25% when feed rate rose from 45 m/min to 233 m/min. Conversely, increasing spindle speed from 148 rpm to 720 rpm reduced Ra by 99.81%. These findings highlight the importance of selecting appropriate parameter combinations to achieve precision, efficiency, and sustainability in milling. The results also provide practical reference for industrial applications and vocational training in manufacturing engineering.

Page 50 of 51 | Total Record : 503

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