cover
Article Per Year (5 Year)
All
Home Page
OAI Link
Editorial Team
Contact
Reviewer
Google Scholar
Contact Name
A. Jannifar
Contact Email
polimesin@pnl.ac.id
Phone
+628126930456
Journal Mail Official
polimesin@pnl.ac.id
Editorial Address
Politeknik Negeri Lhokseumawe Jl. Banda Aceh-Medan Km 280 Buketrata, Lhokseumawe, 24301, Aceh, Indonesia
Location
Kota lhokseumawe,
Aceh
INDONESIA
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 611 Documents
 57   58   59   60   61 
Effect of plasma–ozone injection on the performance of a B30 diesel engine under variable load Alfian Ady Saputra; Muhammad Hardiman Nur Ramadhan; Melati Nurul Insani
Jurnal Polimesin Vol 24, No 2 (2026): April
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v24i2.8740

Abstract

To improve thermal performance and energy conversion efficiency in biodiesel-fueled diesel engines, an active combustion control strategy through modification of the inlet air reactants is crucial. This study investigates the effect of injecting ozone (O₃) produced through a Dielectric Barrier Discharge (DBD) plasma reactor into the air intake of a single-cylinder diesel engine with a variable compression ratio (TV1). Key parameters evaluated included brake power, specific fuel consumption (SFC), air–fuel ratio (AFR), volumetric efficiency, and in-cylinder pressure under varying dynamic loads (1 kg to 9 kg). The experiments were conducted at three compression ratios (14, 16, and 18) with varying ozone doses of 0, 3, 12, 15, and 18 mg. The results showed that the addition of ozone was able to control the combustion duration and phase. The study observed a significant decrease in SFC of up to 25.57% at a compression ratio of 14, an increase in AFR of up to 34.29% at a compression ratio of 16, and an increase in volumetric efficiency of up to 18% at a compression ratio of 18. Cylinder pressure analysis showed an increase in peak pressure and a decrease in net heat release values, indicating a more stable and smoother combustion. These findings confirm that ozone injection acts as an effective chemical cetane improver, especially under operating conditions where the thermal energy of compression is low (compression ratio of 14).
Comparative of field study of three- and four-bladed archimedes spiral wind turbines under natural low wind conditions Anas Faroja; Fatahul Arifin; Carlos RS
Jurnal Polimesin Vol 24, No 2 (2026): April
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v24i2.8908

Abstract

Archimedes Spiral Wind Turbines (ASWTs) are suitable for small-scale energy harvesting in low wind environments.However, field-based evaluation on the effect of blade number under natural wind conditions remains limited. This study experimentally examines the influence of blade number on rotational behavior and electrical performance under natural wind conditions, providing empirical insights beyond controlled laboratory and numerical studies. Three-bladed and four-bladed turbine configurations were fabricated and tested in field conditions with wind speeds ranging from 0.8 to 4.0 m/s. Wind speed, rotational speed, voltage, current, and electrical power were measured and analyzed.  The results show that the four-bladed turbine achieved earlier cut-in behavior and consistently higher electrical output across the tested range, reaching a peak power of approximately 0.29 W at wind speeds of 4.0 m/s, compared with about 0.09 W for the three-bladed configuration. The improved performance was attributed to enhanced torque continuity and rotational stability rather than increased rotational speed alone. Transient current peaks and zero-current events observed near 1.5 to 2.0 m/s were attributed near-cut in electromechanical behavior under short-term wind fluctuations. These results confirm that blade number significantly affects ASWT performance in low wind environments and provide practical guidance for optimizing small-scale wind turbine design.
Hydrogen enriched combustion in a small spark-ignition engine using a NaOH-based alkaline electrolyzer: experimental evaluation at 0.5 kg/cm² brake load Suci Rahmadhani Irawan; Ahmad Ilham Wicaksono; Annisa Wulan Sari; Awaludin Martin
Jurnal Polimesin Vol 24, No 3 (2026): June
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v24i3.8784

Abstract

The increasing concern over greenhouse gas emissions from fossil fuels has driven the exploration of hydrogen as a clean energy source. However, the practical application of hydrogen in internal combustion engines is still limited by the stability of on-demand hydrogen production systems and their integration with conventional engines. This study aims to design and evaluate a NaOH-based alkaline electrolyzer for on-demand hydrogen production and its application in a small spark-ignition engine. The electrolyzer was fabricated using 8 cell stacks with electrode dimensions of 16×16 cm, an inter-electrode gap of 2 mm, and a thickness of 1.2 mm. Experimental tests were conducted at currents of 40 A and 50 A with 30 wt.% NaOH solution. The produced hydrogen gas was directly supplied to a 97cc spark-ignition engine under a constant braking load of 0.5 kg/cm². The result showed that hydrogen production reached 0.9 L/min at 40 A and 1.25 L/min at 50 A. The addition of hydrogen significantly improved engine performance, with brake power increasing by up to 20.8%, brake thermal efficiency by 6.2%, and volumetric efficiency by 9.1%, while reducing brake specific energy consumption by 28%. These findings indicate that hydrogen generated from an alkaline electrolyzer can enhance combustion efficiency and improve overall engine performance, supporting the development of cleaner and more efficient energy systems.
Experimental comparison of thermal performance in PV–AC and PV–DC solar cooker systems under tropical conditions Siwan Edi Amanta Perangin Angin; Yogie Probo Sibagariang; Richard A.M Napitupulu; Jonner Manihuruk
Jurnal Polimesin Vol 24, No 3 (2026): June
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v24i3.8372

Abstract

Photovoltaic-based electric cooking systems are receiving attention as one of clean cooking development in tropical regions. However, experimental comparisons between PV–AC and PV–DC solar cooker systems under identical operating conditions and practical household water loads remain limited. This study experimentally compares the thermal performance of PV–AC and PV–DC solar cooker systems under outdoor tropical conditions in Medan, Indonesia, using identical vessels and water loads of 1.0, 1.5, and 2.0 kg. The analysis focuses on water temperature evolution, heating rate, and time-to-boil (t₁₀₀) under varying electrical and environmental conditions. The results show that the PV–AC system maintained a more stable electrical input of approximately 145–186 W, producing cooking power of 190–210 W and thermal efficiency of 80–90%. In comparison, the PV–DC system operated at 115–160 W with thermal efficiency of 55–70%. For a 2.0 kg water load, the PV–AC system achieved water temperatures of approximately 95–100 °C, whereas the PV–DC system reached about 80–90 °C under similar solar irradiance conditions. The results indicate that electrical power stability significantly affects thermal performance, and that the PV–AC system provides more consistent water heating under tropical operating conditions.
Evaluation of hardness and dry sliding wear performance of Al/BA-silica sand composites as brake friction materials. Sukanto Sukanto; Erwanto Erwanto; Husman Husman; Erwansyah Erwansyah; Rodika Rodika; Yudi Oktriadi; Eko Yudo; Ardiansyah Ardiansyah
Jurnal Polimesin Vol 24, No 3 (2026): June
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v24i3.8952

Abstract

As many as 70 countries have banned the use of asbestos-based materials because its fine, lightweight fibers are easily inhaled by humans, causing lung cancer, particularly mesothelioma, which can be fatal. This study aims to determine the effect of a silica sand and boiler ash reinforcement alloy on the application of non-asbestos aluminum matrix composite brake pads. This research uses a powder metallurgy method with varying reinforcement weight ratios, namely 8%, 10%, 12%, and 14% by weight. The mixing process is carried out through mechanical alloying using a horizontal ball mill at 90 rpm with a BPR ratio of 10:1. Hot compaction at 300°C was varied at a pressure of 5000-5300 PSI, followed by sintering at 580°C. Density, hardness, and wear were tested using ASTM standards, which were then compared with the brake lining standard SNI-09-0143-1987. Microstructural characterization was performed using SEM to determine the extent of interlocking bonds in the composite. The results showed that the 12wt% composition at 5200 PSI produced the best properties, with a density of 2.121 g/cm³, a hardness of 93.628 HB, and a wear of 0.0193 mm³/Nm. SEM images showed more uniform interlocking bonds compared to other variations. Increasing the compaction pressure was proven to increase density, hardness, and wear resistance. Overall, this study successfully produced environmentally friendly composite brake linings based on Silica Sand Powder and Boiler Ash without using asbestos materials.
Vibration-based detection of blower bearing defects using FFT and envelope analysis to improve machine reability Yusuf Efendi; Sally Cahyati; Soeharsono Soeharsono
Jurnal Polimesin Vol 24, No 3 (2026): June
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v24i3.8880

Abstract

Rolling bearing failure in blower machines can disrupt plant operations, increase maintenance costs, and trigger unplanned shutdowns. This study aims to detect early-stage bearing damage in a blower unit at Plant Sabiz using vibration signal analysis. Vibration data were acquired using an SKF Microlog Analyzer CMDT 391 and evaluated using Fast Fourier Transform (FFT) and envelope analysis to identify defect-related frequency components. The results revealed an increase in velocity vibration up to 4.87 mm/s and envelope vibration up to 34.4 gE. The FFT spectrum showed dominant harmonics from 1xRPM to 3xRPM, indicating dynamic imbalance and potential damage to rotating components. Furthermore, envelope analysis identified bearing characteristic frequencies, particularly the Fundamental Train Frequency (FTF) and its harmonics, specifically pointing to cage degradation. This pattern was reinforced by the non-dominance of Ball Pass Frequency Outer Race (BPFO) and Ball Pass Frequency Inner Race (BPFI) frequencies, which ruled out damage to the outer and inner races. Visual inspection confirmed this interpretation, revealing cracks and breaks in the bearing cage. These findings confirm that combining FFT and envelope analysis is effective not only for early detection of bearing defects but also for identifying the specific type of damage based on frequency and harmonic patterns.
Assessment of feedwater hardness effects on thermal efficiency of an industrial fire-tube boiler Hasan Bashori; Wisnu Subrianto
Jurnal Polimesin Vol 24, No 3 (2026): June
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v24i3.8947

Abstract

Boiler efficiency remains an important factor in industrial energy management, where feedwater quality can directly influence heat transfer performance and fuel consumption. This study evaluates the relationship between feedwater hardness and the thermal efficiency of an industrial fire-tube boiler operating under actual industrial conditions. Operational data were collected over a 30-day observation period, including feedwater hardness, steam production rate, natural gas consumption, and boiler thermal efficiency. The boiler performance was initially assessed using engineering-based calculations, including steam energy output, fuel energy input, gas-to-steam ratio, and direct efficiency evaluation. Statistical methods, including Pearson correlation, linear regression, and multiple regression, were then applied to strengthen the analysis. The results indicate that feedwater hardness exhibited a strong negative statistical association with boiler thermal efficiency. The linear regression analysis produced a coefficient of determination of approximately R² = 0.96, indicating that variations in feedwater hardness were strongly associated with changes in thermal efficiency under relatively stable operating conditions. Lower hardness levels were also associated with lower fuel consumption and improved gas-to-steam ratios. Multiple regression analysis further indicates that steam production and fuel consumption also contribute to boiler efficiency. These findings provide field-based evidence supporting the importance of feedwater treatment in maintaining efficient industrial boiler performance.
Experimental investigatopn of temperature-induced performance degradation in BLDC motors for electric vehicle applications Aris Budi Sulistyo; I Wayan Yogi Arta
Jurnal Polimesin Vol 24, No 3 (2026): June
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v24i3.8876

Abstract

The performance of Brushless Direct Current (BLDC) motors in electric vehicle applications is significantly affected by thermal operating conditions; however, experimental studies that directly evaluate temperature-induced performance degradation under real prototype operation remain limited. This study aims to experimentally evaluate the effect of operating temperature on the torque and power characteristics of a BLDC motor integrated into an electric vehicle prototype developed in Bali Land Transportation Polytechnic, Bali. The motor was tested under controlled conditions at rotational speeds ranging from 750 to 2000 rpm. Electrical current, operating temperature, torque, and output power were measured directly, while mechanical output power was calculated using rotational dynamics principles. The results showed that increasing motor speed caused a continuous rise in current and operating temperature, from 34.8 °C at 750 rpm to 87.3 °C at 2000 rpm. Mechanical output power increased with speed and reached a maximum value of 7.13 HP within the range of 1250–1500 rpm, before decreasing at higher speeds despite further increases in current and angular velocity. This reduction was accompanied by a significant decrease in torque, indicating thermally induced electromagnetic performance degradation. The findings identify an optimal operating region limited by temperature and highlight the importance of thermal management for maintaining performance and reliability in electric vehicle propulsion systems.
Design optimization and material selection of automotive bushing arms using FEA under acidic exposure Ana Nur Oktaviani; Dafit Feriyanto; Haftirman Haftirman; Supaat Zakaria; Dedik Romahadi; Hadi Pranoto; SS Abdulmalik
Jurnal Polimesin Vol 24, No 3 (2026): June
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v24i3.8444

Abstract

Bushing arms are critical automotive components that function as vibration dampers and load absorbers. The problem is that the bushing arm often fails due to several factors, including the use of inappropriate materials, poor road quality, lack of routine maintenance, and external factors such as extreme temperatures, exposure to corrosion, and excessive pressure. This study aims to optimize bushing arm design and material selection to improve durability and vibration-damping performance under acidic exposure conditions. Two rubber materials, Natural Rubber (NR) and Ethylene-Propylene Diene Monomer (EPDM), were evaluated for MPV-type vehicle bushing arms. Three design variations were developed and analyzed using hyperelastic Finite Element Analysis (FEA) to assess stress distribution, strain, deformation, and safety factor. The rubber specimens were fabricated by hot pressing at 180°C and 7 MPa, followed by immersion in 15% phosphoric acid at 65°C to evaluate chemical degradation. Mechanical characterization included tensile testing (ASTM D412), Shore hardness testing, and microstructural observation. The results showed that acid immersion reduced tensile strength by 20.44% for NR and 23.80% for EPDM, while elongation decreased by 38.3% and 17.43%, respectively. Hardness decreased by 19.2% for NR and 4.81% for EPDM. FEA results indicated that design C achieved the lowest deformation, reducing it by 51%, while design B reduced shear stress and von Mises stress by up to 70%. Based on the combined mechanical and simulation results, design B with NR material was selected as the preferred configuration.
Effects of cooling time, injection pressure, and material type on the mechanical properties of ballun insulator products in injection molding Muhammad Rifqi Sepvian; Sugeng Hadi Susilo
Jurnal Polimesin Vol 24, No 3 (2026): June
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v24i3.8956

Abstract

A major challenge in injection molding is the instability of mechanical properties in products due to suboptimal process parameter settings, which necessitates identifying the optimal parameter combination to achieve adequate tensile strength and hardness. This study aims to evaluate the effects of cooling time, injection pressure, and material type on the tensile strength and hardness of ballun insulator products produced by injection molding. Two thermoplastic materials, Polypropylene (PP) and High-Density Polyethylene (HDPE), were selected due to their different molecular structures and crystallization behavior, both of which influence mechanical performance. The materials were processed under varying cooling times (20, 25, 30, and 35 s) and injection pressures (24, 27, 30, 33, and 36 bar). The novelty of this study lies in the comparative evaluation of PP and HDPE under identical process conditions for ballun insulator applications. The results showed that higher injection pressure improved mold-filling and molecular chain compaction, leading to increased tensile strength, while longer cooling time promoted more controlled crystallization and improved surface hardness. PP exhibited higher tensile strength due to its stiffer molecular structure, achieving a maximum tensile strength of 0.031 MPa at 36 bars. In contrast, HDPE showed higher hardness due to its denser crystalline structure, reaching 69.75 HD at 35 s cooling time. These findings indicate that material-specific optimization of injection molding parameters is important for achieving consistent mechanical properties and dimensional stability in ballun insulator products.

Page 59 of 62 | Total Record : 611

 57   58   59   60   61 

Filter by Year

2003 2026


Reset
Filter By Issues
All Issue Vol 24, No 3 (2026): June Vol 24, No 2 (2026): April Vol 24, No 1 (2026): February Vol 23, No 6 (2025): December Vol 23, No 5 (2025): October Vol 23, No 4 (2025): August Vol 23, No 3 (2025): June Vol 23, No 2 (2025): April Vol 23, No 1 (2025): February Vol 22, No 6 (2024): December Vol 22, No 5 (2024): October Vol 22, No 4 (2024): August Vol 22, No 3 (2024): June Vol 22, No 2 (2024): April Vol 22, No 1 (2024): February Vol 21, No 6 (2023): December Vol 21, No 5 (2023): October Vol 21, No 4 (2023): August Vol 21, No 3 (2023): June Vol 21, No 2 (2023): April Vol 21, No 1 (2023): February Vol 20, No 2 (2022): August Vol 20, No 1 (2022): February Vol 19, No 2 (2021): Agustus Vol 19, No 1 (2021): February Vol 18, No 2 (2020): Agustus Vol 18, No 1 (2020): Februari Vol 17, No 2 (2019): Agustus Vol 17, No 1 (2019): Februari Vol 16, No 2 (2018): Agustus Vol 16, No 1 (2018): Februari Vol 15, No 2 (2017): Agustus Vol 15, No 1 (2017): Februari Vol 14, No 2 (2016): Agustus Vol 14, No 1 (2016): Februari Vol 9, No 1 (2011): Februari Vol 8, No 2 (2010): Agustus Vol 8, No 1 (2010): Februari Vol 7, No 2 (2009): Agustus Vol 7, No 1 (2009): Februari Vol 6, No 2 (2008): Agustus Vol 3, No 2 (2005): Agustus Vol 2, No 1 (2004): Februari Vol 1, No 1 (2003): Agustus More Issue