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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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Reliability enhancement in petrochemical industry: an integrated RBD and FTA approach Ariandi, Teuku; Away, Yuwaldi; Dirhamsyah, Dirhamsyah
Jurnal Polimesin Vol 23, No 4 (2025): August
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i4.7210

Abstract

Turnaround maintenance plays an important role in the petrochemical industry, directly influencing production reliability and operational continuity. Unplanned shutdowns and service disruptions can result in significant economic losses, yet statistics show that nearly 80% of turnaround activities fail to achieve their performance targets in terms of time, cost, safety, quality, and environmental compliance. This study addresses these challenges by evaluating and enhancing the reliability of the ammonia production system at an Indonesian petrochemical company through an integrated approach combining the Reliability Block Diagram (RBD) and Fault Tree Analysis (FTA). RBD modeling was used to represent the production system as functionally arranged blocks, while FTA was applied to identify root causes of failures. Analysis using ReliaSoft BlockSim and Weibull++ revealed that the system’s reliability was only 0.029 over 5,000 hours, far below the target reliability of 0.9. The most critical components were identified as the Primary Reformer, Ammonia Compressor, and Syngas Compressor. Seven improvement scenarios were simulated, with results showing that the combination of preventive maintenance (PM) and load-sharing configuration yielded the most effective outcome. This approach improved reliability to 0.076 and availability to 0.812. The results show that a proactive, reliability-based maintenance strategy combined with system redundancy can substantially reduce risks of unscheduled shutdowns, extend turnaround intervals, and improve production uptime. Furthermore, the integrated RBD-FTA approach provides a robust framework for proactively identifying and addressing vulnerabilities in complex petrochemical systems.
Energy savings in residential air conditioners using condensate cooling in discharge and liquid lines Yuningsih, Nani; Sumeru, Kasni; Aldiansyah, Muhammad; Tritjahjono, Rachmad Imbang; Nugraha, Fathurahman Yudhi; Abioye, Adenkunle Moshood
Jurnal Polimesin Vol 23, No 4 (2025): August
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i4.6739

Abstract

This research investigates the use of condensate produced by the evaporator to cool the discharge and liquid lines in order to reduce electricity consumption in a residential split-type air conditioner (AC). The experimental setup used a 0.75 kW compressor with R32 refrigerant, where the discharge and liquid line heat exchangers were 20 cm and 15 cm long, respectively. Data were collected over 180 minutes at 5-minute intervals. Results show that using the liquid line cooler (LLC) alone reduced electricity consumption by 5.3% and increased cooling capacity by 2.3%. Using the discharge line cooler (DLC) alone reduced electricity consumption by 8.3% and increased cooling capacity by 7.3%. When both coolers were applied simultaneously (LDC mode), electricity consumption decreased by 10.9% and cooling capacity increased by 9.7%. The corresponding improvements in coefficient of performance (COP) were 9.1% (LLC), 18.6% (DLC), and 24.7% (LDC). These results indicate that using condensate to both the discharge and liquid lines is more effective in reducing electricity consumption and improving AC performance than cooling only one line.
Optimization of plunger geometry and stroke settings on hydraulic performance of diaphragm metering pumps Sonjaya, Muhammad Luthfi; Setyawan, Hendra; Ritonga, Jhordan; Sarifudin, Alfan; Nury, Dennis Farina
Jurnal Polimesin Vol 23, No 4 (2025): August
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i4.7308

Abstract

This study examines the influence of plunger diameter and stroke length on the performance of a hydraulic diaphragm metering pump, focusing on two key indicators: discharge pressure and flow rate. Experiments were conducted with five plunger diameters (7.90–9.00 mm) and three-stroke settings (100%, 75%, and 50%), validated in accordance with API 675 standards. Results show that each 1 mm increase in plunger diameter produced a consistent rise in flow rate across all stroke settings. Linear regression analysis revealed strong correlations, with flow rate increments of 67.54 mL/min per mm at 100% stroke, 60.78 mL/min per mm at 75% stroke, and 25.34 mL/min per mm at 50% stroke. High coefficients of determination (R²) confirm the robustness and predictive accuracy of these models. In addition to regression analysis, a two-way ANOVA was performed to statistically evaluate the effects of plunger diameter and stroke length, as well as their interaction, on pump performance. The ANOVA results confirmed that both parameters significantly affected flow rate (p 0.05), while discharge pressure was largely unaffected by stroke variation. The optimal configuration was achieved at a plunger diameter of 8.00 mm and 100% stroke, delivering performance that meets API 675 requirements. Importantly, this study proposes a novel validation framework for hydraulic diaphragm metering pumps based on API 675—a gap not fully addressed in prior research. These findings provide practical guidance for improving the efficiency and reliability of pump systems through optimized geometric and operational parameters.
Investigating the Effects of Solution Treatment Parameters and Artificial Aging on Hardness Improvement of Precipitation-Hardened 6061 Aluminum Alloy Yunus, Azwar; Akhyar, Akhyar; Hasanuddin, Iskandar; Sasmito, Agus
Jurnal Polimesin Vol 23, No 4 (2025): August
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i4.7076

Abstract

This study investigates the impact of solution treatment parameters such as temperature, holding time, and quenching media on the hardness enhancement of wrought aluminum alloy 6061-T6 through precipitation hardening. The objectives of this research are to analyze the influence of solution treatment parameters on hardness enhancement, explore the correlation between the solutioning step and the artificial aging process, and optimize the heat treatment process for improved hardness values. Specimens of 6061-T6 aluminum alloy initially exhibited a hardness of 102 HV. After heating to 500°C with holding times of 45, 60, and 75 minutes, followed by quenching in water and SAE 40 oil, Vickers hardness testing revealed significant changes: hardness dropped to 52 HV after solution treatment, then increased to 63 HV (21.15% increase) for 60 minutes and 64 HV (23.08% increase) for 75 minutes. After artificial aging at 210°C for 120, 180, and 240 minutes, the maximum hardness recorded was 113 HV, marking a 10.78% increase from the initial hardness. The quenching medium also influenced hardness; specimens quenched in SAE 40 oil showed improved hardness compared to those quenched in water, likely due to slower cooling rates that allow for better precipitate formation. The increase in hardness is closely linked to microstructural changes during heat treatment. Solution treatment promotes the dissolution of alloying elements, leading to the formation of fine precipitates during aging. These precipitates impede dislocation movement, enhancing the alloy's strength through precipitation hardening. Thus, the density and distribution of these precipitates significantly contribute to the overall hardness enhancement observed in the 6061-T6 aluminum alloy
Implementation of an automatic monitoring system using electromagnetic induction parameters to enhance hot forging quality Maulana, Gun Gun; Martawireja, Abdurrahman Harits; Suryatini, Fitria
Jurnal Polimesin Vol 23, No 4 (2025): August
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i4.3313

Abstract

This research presents the implementation of an automatic monitoring system using electromagnetic induction parameters to enhance the quality of heating processes in hot forging industries. Efficient heating is essential in industrial applications, particularly during the production stage of hot forging. To ensure consistent product quality and optimize energy efficiency, accurate and responsive monitoring is required. The proposed system integrates electromagnetic induction sensors to capture, in real time, the physical characteristics of heated AISI 4140 Bolt M24 × 100 mm (±0.35 kg). Sensor data are processed using intelligent algorithms to identify critical parameters such as temperature, heat distribution, and optimal heating time. Based on these results, the system automatically adjusts heating parameters, thereby ensuring consistent product quality and improved energy efficiency. The results indicate that the system, supported by a Human–Machine Interface (HMI), Programmable Logic Controller (PLC), and infrared temperature sensors, was effectively implemented. It demonstrated real-time monitoring of process parameters with no detected errors, smooth data transfer between components, and reliable temperature display on the HMI with an average delay of only 1.1 seconds. This research provides an integrated solution to improve hot forging quality, reduce energy waste, and accelerate production cycles, contributing to more intelligent heating control systems for industrial applications.
Harnessing oil refinery exhaust heat via organic rankine cycle for green hydrogen production toward net-zero emissions Hajianto, Muhamad Roni; Mutaqien, Gilang Nurul; Wibowo, Dipta Ario; Latifin, Latifin
Jurnal Polimesin Vol 23, No 4 (2025): August
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i4.7217

Abstract

The increasing CO2 emissions and the complexity of human activities have driven the Indonesian government to enact Law Number 16 of 2016 to achieve greenhouse gas emission reduction targets by 2030. Oil refineries, which previously only disposed of waste heat without being utilized, have now become potential sources of sustainable energy. Through the development of Organic Rankine Cycle (ORC) technology, this waste heat can be converted into electricity. This research focuses on four types of working fluids, namely Propane, Isopentane, Isobutane, and R245fa. The results showed that the electricity generated from each ORC system was 18.34 MWh (Propane), 52.77 MWh (Isopentane), 32.17 MWh (Isobutane), and 21.23 MWh (R245fa), respectively. This electricity can be used to produce green hydrogen through electrolysis methods, resulting in 366.83 kg (Propane), 1055.42 kg (Isopentane), 643.33 kg (Isobutane), and 424.67 kg (R245fa) of green hydrogen. Compared to hydrogen production through fuel technology, ORC implementation can reduce CO2 emissions by 12.64 t.CO2 (Propane), 36.36 t.CO2 (Isopentane), 22.16 t.CO2 (Isobutane), and 14.63 t.CO2 (R245fa). All calculations were based on 24-hour operation. Isopentane produces the highest power among the four other organic working fluids and generates the largest profit from green hydrogen production through electrolysis processes, amounting to Rp. 55,069,944.78 per day. The innovation of applying ORC systems in oil refineries is an effective step in reducing carbon emissions to support sustainable energy production.
Thermal and energy performance of PET, HDPE, and LDPE melting using a flat-plate heating system Mahyuddin Mahyuddin; Muhtadin Muhtadin; Muhammad Faisal; Iqbal Iqbal; Hidayatullah Hidayatullah; Erdiwansyah Erdiwansyah
Jurnal Polimesin Vol 23, No 4 (2025): August
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i4.6929

Abstract

The increasing accumulation of plastic waste, particularly polyethylene terephthalate (PET/PETE), high-density polyethylene (HDPE), and low-density polyethylene (LDPE), poses a significant environmental challenge due to their resistance to biodegradation. This study investigates the feasibility of melting these plastics using a low-cost flat-plate heating system maintained at 400 °C under controlled experimental conditions, with periodic stirring to promote uniform heat transfer. The results indicate that for a 0.2 kg sample, the heater consumed 1.157 kW for PET, 1.369 kW for HDPE, and 1.321 kW for LDPE. Complete liquefaction was achieved in 44 minutes for PET and HDPE, and 45 minutes for LDPE. The maximum temperatures reached were 350 °C for PET and LDPE, and 370 °C for HDPE. The overall heat transfer was calculated at 28.98 W. These findings demonstrate that PET offers the most favourable energy–time balance, making it the most suitable candidate for small-scale recycling via this method. Compared to conventional thermal recycling, the flat-plate heating approach is simpler, more affordable, and potentially scalable for community-level applications. However, limitations remain, particularly regarding small batch size (0.2 kg) and the absence of long-term performance testing. This study provides preliminary evidence that flat-plate heating systems could serve as practical alternatives for decentralized plastic recycling, supporting sustainable waste management practices.
A fuzzy-PID based control approach for precision volume filling in nitroglycerin production Yaqin, Sa’id A’inul; Rusli, Mochammad; Siswojo, Bambang
Jurnal Polimesin Vol 23, No 4 (2025): August
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i4.7346

Abstract

The production of nitroglycerin demands highly accurate liquid volume filling, as any deviation can significantly impact both product quality and safety. Peristaltic pumps are employed in this process due to their ability to deliver fluids with precision; however, maintaining volume accuracy amidst process variability remains a major challenge. This study aims to enhance volume-filling accuracy, improve system response, and increase energy efficiency in the nitroglycerin production process by implementing a Fuzzy-PID control system. The Fuzzy-PID method is applied to address uncertainties and dynamic variations inherent in peristaltic pump operations. The system's performance is evaluated in terms of accuracy, response characteristics, and energy consumption. Experimental results demonstrate that the use of Fuzzy-PID control achieves a volume-filling accuracy of up to 98%. This improvement contributes significantly to the efficiency and safety of nitroglycerin production, ensuring higher product quality and operational reliability.
Effect of magnetite nanoparticles on the viscoelastic properties of magnetorheological elastomers Priyandoko, Gigih; Suwandono, Purbo
Jurnal Polimesin Vol 23, No 4 (2025): August
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i4.7109

Abstract

Advanced materials known as Magnetorheological Elastomers (MREs) can be used to dampen vibrations. These materials reduce vibration disturbances by responding to an externally applied magnetic field, which alternate their mechanical characteristics. The objective of this research is to explore the effect of incorporating magnetic nanomaterials (Fe₃O₄) on the properties of MRE. The modified material is expected to exhibit enhanced sensitivity to magnetic fields, thereby improving its vibration-damping performance. The MRE mixture utilized in this investigation consists of Carbonyl Iron Powder (CIP), silicone oil, and silicone rubber, with mass percentages of 30%, 5%, and 65%, respectively. The MRE was then given magnetite nanomaterials in amounts of 0.5%, 1%, 1.5%, and 2% of the total weight. To produce MRE, thoroughly mix the silicone rubber with silicone oil and then gradually add the carbonyl iron powder, ensuring uniform dispersion. Once the homogeneity was achieved, the magnetite nanomaterial were incorporated into the MRE mixture with precision. The resulting composite were then cured, optionally under a magnetic field to induce anisotropic alignment. Laboratory tests were conducted on the new material. These tests involved analyzing their elemental composition and evaluating their viscoelastic properties. The research findings indicate the successful development of MREs containing Fe₃O₄ nanomaterials for the purpose of vibration dampening within the frequency range of 1–100 Hz. At a center frequency of 1,167 Hz, MRE-2 (MRE with a 0.5% addition of Fe₃O₄) demonstrated the strongest damping performance, exhibiting the highest tan δ value. This makes MRE-2 the primary choice. MRE-1 is an excellent alternative due to its high stiffness and effective damping at low frequencies.
PID-controlled active damping to mitigate chatter in lathe machining Sunarya, Adhitya Sumardi; Khoirunnisa, Hilda; Lilansa, Noval; Anggraeni, Pipit; Nugraha, Nurwisma; Mumtaha, Raden Malik Hakim Muslim
Jurnal Polimesin Vol 23, No 4 (2025): August
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i4.6418

Abstract

Chatter is a result of undesired vibration in manufacturing that damages product surfaces and reduces production efficiency. Addressing chatter requires enhancing machine-tool dynamic stability, optimizing cutting parameters, and implementing real-time monitoring and control. This study presents a PID-controlled active damping system developed through theoretical analysis, simulation, and experimental testing on LabVIEW and Arduino platforms. Orthogonal turning simulations were conducted with spindle speed of 1000 RPM, feed rate of 0.2 mm/rev, and depth of cut of 1 mm. Vibration sensors enabled rapid chatter detection, and real-time PID adjustments suppressed instability within 0.02 seconds, achieving 98.11% suppression accuracy. Data acquisition was carried out using NI DAQ USB-6218, with Arduino and LabVIEW results showing close agreement, apart from minor deviations due to communication delay. The system improved surface finish, reduced tool wear, and enhanced overall machining performance. These results show the potential of PID-based active damping as an effective solution for real-time chatter suppression and efficiency improvement in lathe machining.

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