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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 25 Documents
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Search results for , issue "Vol 23, No 5 (2025): October" : 25 Documents clear
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.
Distortion and mechanical properties of welded AA5083 aluminum material with friction stir welding Pujono, Pujono; Kurniawan, Ipung; Pribadi, Joko Setia; Laksana, Nur Akhlis Sarihidaya; Tarigan, Roy Aries Permana
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.v23i5.7798

Abstract

AA5083 series aluminum is one of the primary materials used in ship construction due to its excellent weldability in conventional welding processes, such as arc welding. However, similar to other aluminum alloys, the weakness of AA5083 is the occurrence of frost cracking during the welding process, especially in the HAZ and the large amount of distortion.. The research was conducted by providing additional treatment in the form of in-situ rolling on friction stir welding (FSW). The in-situ rolling treatment used a single roll positioned directly on the weld area and behind the FSW tool and moving simultaneously with the welding process and with a roll load of 8000N. The characterization carried out included thermal cycle measurements, microstructure observations, hardness value distribution testing, distortion measurements and tensile testing. The results showed that the largest distortion value occurred in the welded material without additional treatment (as welded) of 2.81 mm, while in the material with additional treatment (mechanical), the distortion value was smaller at 1.1 mm. The mechanical specimen had the best mechanical qualities, with a tensile strength of 225.5 MPa and an average hardness value of 61 VHN, whereas the as-welded specimen's tensile strength was 201.8 MPa. This phenomenon occurs because the specimen, with the addition of in situ rolling, experiences grain refinement, and it seems that this is consistent with the Hall-Petch relationship, σ_y=σ_0+k_y d^(-1/2)Materials with fine grains are harder and stronger than materials with coarse grains, because fine grains have a larger total grain boundary area to hinder dislocation movement. The tensile fracture position was in the advancing side region, where higher heat input occurred in this region than in the retreating side. 
An in-situ experimental and numerical evaluation on thermoelectric generators performance utilizing diesel engine exhaust heat Sugiyanto, Sugiyanto; Aisyah, Nyayu; Prayitno, Yosephus Ardean Kurnianto; Bahiuddin, Irfan
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.v23i5.7615

Abstract

Waste Heat Recovery (WHR) from heavy-duty diesel generators using Thermoelectric Generators (TEGs) offers a potential way to improve total system efficiency and reduce fuel consumption. This study combines experiments and numerical simulation to evaluate the performance of Hi-Z HZ 14 TEGs modules applied to a 6-cylinder, 60 kVA diesel generator. Experimentally, TEG modules were mounted equidistantly along the exhaust manifold, 40 cm from the engine, and tested at idle (750 rpm) with and without active air-side cooling. Hot- and cold-side temperatures, open-circuit Voltage (Voc), load power, and conversion efficiency were recorded. A matching TEG configuration was simulated under the same boundary conditions. As a result, active cooling increased the temperature differential and consistently improved power output and efficiency relative to natural convection. An efficiency of 2.1% was observed, in reasonable agreement with the simulation and consistent with typical TEGs performance under comparable operating conditions. Although this value confirms the feasibility of TEG integration in heavy-duty diesel exhaust systems, further improvements are possible through material selection, heat-sink optimization, and advanced cooling strategies.
Design and development of a radial air bearing concave profile for an educational tool Harja, Herman Budi; Febriani, Risky Ayu; Saksono, Novi; Diratama, M Yazid; Fauzi, M
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.v23i5.7216

Abstract

The increasing demand for high-speed, precision machinery has highlighted the limitations of conventional friction and anti-friction bearings, driving the need for more advanced bearing technologies, such as air bearings. However, achieving competency and skills related to air bearing components is difficult to access, particularly radial air bearing rigs. This paper presents the design of a radial air bearing rig as a learning tool to support educational objectives in understanding the working principles, use, and maintenance requirements of air bearing systems. The design stages use the VDI 2222 methodology and utilize SolidWorks for modeling. Air quality specifications refer to the ISO 9001:2015 – New Way Air Bearings standards, which consist of a fly height of 5μm, with operational parameters of 4–6 Bar input pressure and 2–13 LPM flow rate. The rig uses a single-phase motor for shaft rotation and a porous pad for air distribution. The test results show that the rig achieves a fly height of 0.5 μm at 4 Bar pressure and 5 LPM flow rate, although its rotation exhibits resistance. These outcomes confirm the rig’s potential as an educational tool and highlight the need for mechanical improvements to enhance its performance.

Page 3 of 3 | Total Record : 25

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