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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 553 Documents
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Optimisation of biolubricant synthesis from castor–maggot oil mixture via two-stage transesterification using response surface methodology Mukhriza, Teuku; Hasibuan, Adelia Yesya Putri; Juwita, Erna; Husin, Husni; Silitonga, Arridina Susan
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.v24i1.8376

Abstract

This study investigates the optimisation and characterisation of a biolubricant produced from a castor–maggot oil mixture via two-stage transesterification. Response surface methodology using a Box–Behnken design was employed to optimise the oil volume ratio, catalyst concentration, and reaction time. The optimum conditions were a castor oil–maggot oil ratio of 50% (v/v), a catalyst concentration of 1% (w/w), and a reaction time of 2 h, resulting in a biolubricant yield of 71.43%. Ethylene vinyl acetate and ethyl-cellulose were added to enhance stability and performance. The biolubricant exhibited a viscosity index of 101.88, kinematic viscosity at 40°C of 54.57 cSt, and a flash point of 235°C, complying with ISO VG 68 and SNI 7069.9:2016 standards. These performance characteristics demonstrate favourable viscosity–temperature behaviour, adequate thermal safety, and suitability for industrial lubrication systems. The integration of mixed vegetable–insect oil feedstocks with Response Surface Methodology (RSM)–Box–Behnken optimisation, together with the incorporation of performance-enhancing additives, resulted in a biodegradable, non-toxic, and environmentally friendly biolubricant that meets standard requirements and shows strong potential as a sustainable alternative to petroleum-based lubricants for mechanical applications.
Optimization of power and efficiency of a vortex water turbine through blade–outlet distance and transmission ratio analysis Asagi, Florensius Kitaro; Wijayanto, Danar Susilo; Saputra, Taufik Wisnu
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.v24i1.7933

Abstract

As fossil fuel resources decline, vortex water turbines offer a promising renewable energy alternative by utilizing river flow. This experimental research aims to analyze the effect of blade distance from the outlet and transmission ratio on the electrical power and efficiency produced by vortex water turbines as a renewable energy solution. Three variations of blade distance from the outlet (20 mm, 40 mm, and 60 mm) and three variations of transmission ratio (1:3, 1:4, and 1:5) were tested under seven water flow rate variations of 27.8 l/min, 33.68 l/min, 34.11 l/min, 34.54 l/min, 34.97 l/min, 35.4 l/min, and 35.83 l/min. Data were collected for 5 minutes, with a 10-second interval for each parameter. Test results show that the highest electrical power of 4.88 watts was achieved at a blade distance of 20 mm from the outlet, a transmission ratio of 1:5, and a water flow rate of 35.83 l/min. Meanwhile, the highest turbine efficiency of 11.25% was obtained at a blade distance of 20 mm from the outlet, a transmission ratio of 1:3, and a water flow rate of 35.83 l/min. Increasing blade–outlet distance reduced both power and efficiency, while higher transmission ratios increased power but decreased efficiency due to torque–speed trade-offs. These results confirm that the distance between the blade and the outlet, and the transmission ratio, are critical parameters for optimizing performance of vortex turbines. A blade distance closer to the outlet provides the best performance and a larger transmission ratio will also improve performance, although transmission loading must also be considered.
Design and performance test of a water hyacinth (Eichhornia crassipes) and coconut shell charcoal briquette mixing machine Rohmat, Yusup Nur; Kusmayadi, Adi; Sugara, Ferry; Apriansyah, Riza; Agustin, Neli
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.v24i1.7712

Abstract

Dependence on fossil fuels such as oil and natural gas gives rise to various problems, including rising energy prices, limited supply, and environmental impacts in the form of high carbon emissions. Therefore, efforts are needed to develop alternative energy sources based on local raw materials such as biomass briquettes which can be made from various organic waste, such as water hyacinth and coconut shells. The objectives of this research focus on the design, manufacture, and performance testing of briquette mixing and molding machines, as well as analysis of the quality of briquettes produced from a mixture of coconut shell charcoal and water hyacinth with the addition of paraffin wax as an adhesive. The machine was designed using dimensions of 1000×500×500 mm, equipped with a spiral mixer supported by an S45C steel shaft. This research presented a method of making briquettes with various compositions of water hyacinth and a mixture of coconut shell charcoal and paraffin wax as adhesives, and tested for calorific value, ash content, and combustion rate. The best results were obtained from a mixture of 70% coconut shell charcoal, 30% water hyacinth, and 5% paraffin wax, with a calorific value of 6.285 cal/g, an ash content of 2%, and a stable combustion rate of 0.12–0.16 g/min. The addition of paraffin wax has been shown to improve combustion stability and energy efficiency. The research results show that the designed mixer and briquette press machine function effectively, and briquettes made from biomass waste with natural adhesives have great potential as an environmentally friendly and economical alternative fuel.

Page 56 of 56 | Total Record : 553

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