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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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Effect of Full Annealing and Single Quenching-Tempering Heat Treatment on the Mechanical Properties of JIS SUP 9A Steel Andreas Luki Indratmoko; Irza Sukmana; Mohammad Badaruddin
Jurnal POLIMESIN Vol 21, No 2 (2023): April
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v21i2.3523

Abstract

JIS SUP 9A leaf spring steel under hot-forging conditions was subjected to full annealing (FA) and single step-quenching-tempering heat treatments (SQT). Tensile test specimens to ASTM E 8 standards have been prepared. The FA process was performed by heating all specimens in the furnace at a constant temperature of 800°C for 2 hours, followed by cooling in the furnace. Then, all test specimens were heat-treated SQT. The SQT process was carried out by heating all samples in a furnace at 800°C for 1 hour and 650°C for 1 hour, each followed by immersion in crude palm oil (CPO) media at a liquid temperature of 70°C until the specimens reached 100°C. The FA process removes internal stresses with high microstructural softness and SQT produces a fine martensitic phase microstructure, which improves mechanical strength (tensile strength and impact strength) with good ductility. Electron and scanning microscopy have been used to determine the concentration of impurities and microstructural changes in relation to the mechanical properties of the specimen concerned. The results showed that the yield limit, maximum tensile stress, and impact energy increased by 113.5%, 16.3%, and 705.2%, respectively. However, hardness decreased by 18.8% for SQT specimens against FA after heat treatment. This research utilizes industrial waste, which is available quite a lot; in the future, it will become an alternative for handling environmental problems. The abundant availability of raw materials and resulting strength-toughness are the main advantages of this heat treatment
Techno-economic assessment of wind power generation feasibility in Sabang Zulfaini Zulfaini; Adi Setiawan; Muhammad Daud
Jurnal POLIMESIN Vol 21, No 4 (2023): August
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v21i4.3664

Abstract

Utilization of renewable energy in Aceh is still limited mainly to small-scale electricity through micro-hydro and solar power plants, accounting for less than 1% of the energy composition. Sabang stands out as a region with significant wind energy potential, boasting a speed of 8 m/s and an average power density of 537 W/m2 for the windiest 10% of the region. Therefore, to explore the viability of harnessing wind energy, a pre-feasibility study is needed. This study aimed to assess the techno-economic feasibility of constructing a wind power plant for electricity generation in Sabang by evaluating the region's wind energy. The statistical method of the Weibull Distribution probability density function was employed to evaluate Wind Power Density (WPD), Wind Turbine Capacity Factor, and Energy Output. Additionally, economic feasibility analysis involved calculating Net Present Value (NPV), Benefit Cost Ratio (BCR), Internal Rate of Return (IRR), Discounted Payback Period (DPP), and Levelized Cost of Energy (LCOE). The results showed that Sabang exhibited favorable[UMN1]  wind characteristics with a shape parameter (k) of 1.6, average wind speed (Vm) of 7.9 m/s, and scale parameter (c) of 9 m/s. These features classified Sabang as wind power class 6 with a WPD of 735 watts/m2 at a height of 50 m, and the results were categorized as excellent. The study concluded that constructing a wind power plant in Sabang using the Enercon E-70 turbine at a hub height of 100m was technically feasible. The shape parameter (k) was 1.6, the average wind speed (Vm) was 9.3 m/s, scale parameter (c) was 11 m, and the WPD reached 1213 W/m2, leading to a turbine capacity factor of 0.53 and an annual energy production (AEP) of 64,876,560 kW. The economic analysis yielded promising results for wind power projects. The DPP value was estimated at 5.6 years, the BCR at 1.96, the NPV amounted to USD 14,434,994, the IRR reached 17.9%, and the LCOE was assessed at USD 32.50/MWh. Considering all these economic indicators, it was evident that constructing a wind power plant in Sabang was highly feasible and financially viable 
Performance investigation of installed Pico-Hydro power using maximum power point tracking based on incremental conductance algorithm in solar water pumped storage system Akhiriyanto, Novan; Waskito A, Wasis; Pratama, Akbar; Satria P, Radith
Jurnal Polimesin Vol 21, No 6 (2023): December
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v21i6.4224

Abstract

The Solar Water Pumped Storage System (SWPS) has been gaining popularity as an environmentally friendly and sustainable solution to address water supply challenges in areas with abundant solar radiation. The potential energy stored in SWPS is harnessed by converting it into electrical energy through the installed pico-hydro power (picoHP) within the SWPS distribution pipe system. PicoHP performance depended on the flow rate and water pressure, which could not be naturally controlled, leading to low reliability in picoHP generation. This research aimed to optimize picoHP performance through engineering changes in pipe diameter and voltage regulation using a SEPIC MPPT circuit based on the Incremental Conductance (INC) algorithm. The parameters affecting the voltage and current of the picoHP were the water level in the tank and the choice of pipe adapter type based on changes in pipe diameter. The SEPIC MPPT circuit with the INC algorithm began operating when the input voltage from the picoHP reached 7.56 V, resulting in an output voltage of 11.2 V with a duty cycle (D) = 25%. This indicated a delay in the operation of the SEPIC MPPT with the INC algorithm due to the computational process, which did not respond quickly when the input voltage from the picoHP started to decrease. The electrical energy generated by the picoHP through the SEPIC MPPT circuit successfully charged the battery through the BMS module.
Prototype of Laboratory-Scale Plasma Arc for Thin Film Growth and Its Testing Marta, Akbar Andika; Buwono, Haris Puspito; Yudiyanto, Eko; Rohman, Fatkhur; Weddakarti, Eva
Jurnal Polimesin Vol 22, No 1 (2024): February
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v22i1.4670

Abstract

Thin films, characterized by small-dimensional materials on a substrate formed through sequential deposition of ionic/molecular/atomic materials, have gained significance in various industries. An emerging method, Arc Plasma Deposition (APD), is gaining attention for its effectiveness in minimizing environmental pollution. This research explores the potential of APD, an environmentally friendly technique, in coating materials, particularly copper, at a laboratory scale. The objective is to introduce a cost-effective solution for material deposition, addressing the industrial need for efficient and eco-friendly coating processes. A laboratory-scale prototype for coating materials, specifically utilizing copper metal, is introduced and tested. The APD process is conducted in an atmospheric free-oxygen chamber, where plasma is generated. The deposited copper is analyzed concerning the deposition time, providing insights into the efficiency of the APD technique. The laboratory-scale prototype demonstrates the feasibility of using APD for coating materials. The results indicate the potential of APD in efficiently producing thin films, making it a promising alternative for industrial applications. 
Trends, relationship, and model of selected service sector workers in Malaysia: Physiological responses of mental workload and mental fatigue during performing real-time tasks Nurul Izzah Abd Rahman; Siti Zawiah Md Dawal; Nukman Yusoff; Siti Nurani Hassan; Azmah Hanim Mohamed Ariff
Jurnal POLIMESIN Vol 21, No 2 (2023): April
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v21i2.3310

Abstract

Service sector is a job that is considered exposed to high mental demand. There is lack of technique to measure issues related to the mental workload and mental fatigue levels among workers. Moreover, no studies have yet developed a model to predict mental fatigue especially for service sector workers. It is necessary to investigate mental workload and mental fatigue in real time working activities. The main purpose of this study was to identify the trends and relationship between mental workload and mental fatigue level among service sector workers. Ten participants with a mean age of 35.00±8.62 (SD) years took part in the study. Two experiments in Without Rest (WoR) and With Rest (WR) segments involving data entry and arithmetic tasks were conducted. Physiological measures using Electroencephalogram (EEG), Electrooculogram (EOG) and heart rate (HR) were assessed while participants were performing the tasks. The result shows that EEG alpha signal was significantly higher at the end of WR compared to WoR segment (p0.05). Comparison between WoR and WR segments for each task show that HR of WR tasks were significantly lower in all tasks (p0.05). This study developed seven mental workload and mental fatigue conceptual models with strong variables correlations (r0.05) to evaluate the variability of both parts of two types of activities, namely, data entry and arithmetic tasks. The findings highlighted that validated parameters and methods for mental fatigue and mental workload measures are brain signals and heart rate monitoring, and task performance measure. Significant findings of the study could be as a reference for organizations to plan and manage resources by optimizing mental workload condition and minimizing mental fatigue occurrence
Effect of tubular-typed charcoal height variations on efficiency in passive interfacial solar desalination Pardiono, Tri Ramadhani; Jafri, Muhamad; Tarigan, Ben Vasco
Jurnal Polimesin Vol 22, No 3 (2024): June
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v22i3.4890

Abstract

Passive solar desalination is a process of reducing the salt content of salt water to produce fresh water by utilizing solar heat. In recent years, interfacial heating has been proposed as an alternative to evaporation by creating localized heat on the water surface. Charcoal is an absorbent, heat storage, and wettability material, so the evaporation process not only occurs on the surface of seawater but also on the surface of the charcoal, which results from this wettability. The height of the charcoal indicates the distance the steam travels to reach the glass surface for the condensation process, thereby speeding up evaporation. The experiment was carried out in 4 single-slope-type basins using tubes filled with charcoal as high as 30, 40, and 50 mm for 8 hours in the sun. The results showed that adding heat-absorbing material to the basin was able to accelerate seawater to reach its boiling point so that it could evaporate. The temperature and humidity in each basin also have a similar changing trend where temperature is strongly influenced by solar radiation. The use of charcoal can also increase the rate of convection and evaporation heat transfer in the basin, as well as the maximum efficiency in basin 4 with an efficiency value of 56.40%, basin 2 at 53.17%, basin 3 at 51.62%, and basin 1 44.17%. Efficiency is obtained from the desalination efficiency equation, namely the ratio of the latent heat of vaporization to the solar energy entering the system
Investigation of the Mechanical Behavior of Laminated Composites Gypsum-Based Plastic Sack Waste Fiber Indra Mawardi; Samsul Bahri; Hamdani Nurdin; Irwin Syahri Cebro; Luthfi Luthfi; Zuhaimi Zuhaimi; Ismi Amalia
Jurnal POLIMESIN Vol 21, No 1 (2023): February
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v21i1.3275

Abstract

The existence of plastic waste, such as used plastic sacks in large quantities, is a crucial problem for the environment and health because of its very low biodegradability. Therefore, reusing plastic sack waste as reinforcement in gypsum composites is a major research issue. This study investigates the mechanical and physical properties of gypsum composites reinforced with fiber layers from plastic sack waste. Gypsum composites are produced using casting gypsum flour as the matrix and various fiber layers from plastic sack waste (1, 2, 3, 4) as reinforcement. Gypsum-based laminated composites were tested for density, flexural strength, and compression. The behavior of mechanical, physical, and damage properties is studied to see its suitability as a building material. The results showed that gypsum composites' density decreased with increasing sack fiber layers. The density of gypsum composites ranges from 1064-1199 kg/m3, with a maximum value in samples with 100% gypsum. The flexural strength of gypsum composites ranges from 2.21-4.10 MPa, and the compressive strength ranges from 3.5-6.66 MPa. Increasing the number of layers of plastic sack fibers reduces density, flexural strength, and compressive strength. However, all the mechanical properties of gypsum composites met the requirements of the EN 13279-2 standard. Failure of fiber delamination with the resulting matrix is the main cause of the decrease in mechanical strength
Real-time thermodynamic monitoring of split inverter ACs: amicrocontroller-driven investigation of performance I Gede Artha Negara; Adi Winarta; Putu Wijaya Sunu; I Dewa Made Cipta Santosa; I Nyoman Suamir; I Gusti Agung Bagus Wirajati; I Dewa Gede Agus Tri Putra
Jurnal Polimesin Vol 22, No 2 (2024): April
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v22i2.4178

Abstract

Recent technological advancements, particularly in air conditioning cooling systems, have led to rapid developments such as inverter technology. Inverter technology provides various advantages including energy savings compared to non-inverter air conditioners. Globally, the inverter modulates the compressor to continue operation despite reaching the set temperature. This study aimed to monitor the performance of split inverter air conditioners utilizing microcontroller technology. The microcontroller model employed was the ATmega2560, capable of logging each test parameter and displaying in real-time. Additionally, the ATmega2560 integrated sensors including the DS18B20 temperature sensor and PZEM 004-T multifunction electrical sensor. Monitoring occurred over one hour of operation on a 8525 Btu/h capacity split inverter AC. Experimental monitoring results showed the lowest Tsupply at T1 compared to other temperatures, reaching 8°C. At Treturn, both T1 and T2 exhibited identical decreasing trends to 25.5°C around 3000 s. The minimum power variation occurred at P5 relative to other variations. The average power consumption of the split inverter AC was approximately 750 W. The minimum energy consumption observed was at E5 during the study, while the maximum was at E1 with peak energy consumption of 0.96 kWh. Microcontroller-based experimental monitoring can provide real-time results and shows promise for monitoring split inverter AC performance.
Pellet moulding machine design and simulation analysis of the effect of angle variation in the mold hole on pellet alloy pressure Husni Husni; Arif Faturrahman; Muhammad Rizal
Jurnal POLIMESIN Vol 21, No 3 (2023): June
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v21i3.2641

Abstract

The development of aquaculture in Indonesia has increased every year. However, in reality, farmers find failed fish harvests arising from fish feed problems. Various problems in the field occurred by fish farming business actors due to the incompatibility of the pallet molding machines used with the quality of raw materials and the high price of fish feed. For this reason, it is necessary to have a new technology in the form of a pellet molding machine to overcome the problems that often occur. This study aims to design a pellet molding machine with modifications to the angle of the mold hole and analyze changes in pressure values and production rates from the effect of the angle given to the mold to obtain a good mix of pellets and a shorter production speed. The method used is design and simulation, with machine variables that have been designed using angles of 30º, 45º, and 60º. The highest pressure value data is obtained at an angle of 45º with a maximum pressure value of 11.86 Pa and the lowest pressure value is at an angle of 30º with a maximum pressure value of 10.62 Pa. The highest speed value is obtained at an angle of 45º and 60º with a value of 4 .8 m/s and the lowest value is obtained at an angle of 30 o with a value of 4.7 m/s. In a pellet molding machine that uses an unmodified mold, the maximum pressure value is 10.36 and the speed is 4.6 m/s, which means that the angle at the mold hole gives an increase in pressure and production speed which will make the pellets have better mix and faster production time.
Innovative catalytic converter from FeCrAl material coated by γ-Al2O3 and NiCr for increasing thermal stability at high temperature operation Dafit Feriyanto; Zaenudin Zaenudin
Jurnal Polimesin Vol 21, No 6 (2023): December
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v21i6.4268

Abstract

The transportation sector plays a significant role in air pollution and the greenhouse gas effect. Therefore, the innovation of exhaust system component needs to be conducted to reduce those issues. The most effective technology is by using a catalytic converter have main function is to convert the exhaust emission. The main problemfaced by the previous study is the high degradation of FeCrAl material up to 19.58 mg at 1000oC. Therefore, the objective of this study is to develop a catalytic converter that has high thermal stability. This research was conducted by various coating processes which is Ultrasonic Bath (UB) and ultrasonic bath combined with electroplating (UB+EL) with parameters of UB consisting of frequency of 35 kHz, various holding times of 1, 1.5, 2, 2.5 and 3 hours while parameters in electroplating process are current density of 8 A/dm2 and holding time of 15, 30, 45, 60 and 75 minutes. That process was followed by a drying process at 60oC for 12 hours. The materials used in this research are FeCrAl as substrate, Ni as catalyst, γ-Al2O3 and Cr as wash-coat material. The results show that coating process coating process of γ-Al2O3 and NiCr on FeCrAl substrate succeeded in analysis proved by microstructure and composition analysis. The appropriate coating is shown by UB+EL 30 minute with the highest thermal stability of 2.85mg and reaction point is 0.07 mg/minute. Several compounds developed during the coating process such as in UB process develop FeCrAl, FeO, γ-Al2O3 and FeCr2O3 compounds and in the UB+EL process FeCrAl, FeO, γ-Al2O3, FeCr2O3, NiO, NaO2, NiAl2O4 and NiCr2O4 compounds. Therefore, UB+EL 30 minutes is the most parameters that are recommended to be applied due to the lowest mass degradation and more compounds.The transportation sector plays a significant role in air pollution and the greenhouse gas effect. Therefore, the innovation of exhaust system component needs to be conducted to reduce those issues. The most effective technology is by using a catalytic converter have main function is to convert the exhaust emission. The main problemfaced by the previous study is the high degradation of FeCrAl material up to 19.58 mg at 1000oC. Therefore, the objective of this study is to develop a catalytic converter that has high thermal stability. This research was conducted by various coating processes which is Ultrasonic Bath (UB) and ultrasonic bath combined with electroplating (UB+EL) with parameters of UB consisting of frequency of 35 kHz, various holding times of 1, 1.5, 2, 2.5 and 3 hours while parameters in electroplating process are current density of 8 A/dm2 and holding time of 15, 30, 45, 60 and 75 minutes. That process was followed by a drying process at 60oC for 12 hours. The materials used in this research are FeCrAl as substrate, Ni as catalyst, γ-Al2O3 and Cr as wash-coat material. The results show that coating process coating process of γ-Al2O3 and NiCr on FeCrAl substrate succeeded in analysis proved by microstructure and composition analysis. The appropriate coating is shown by UB+EL 30 minute with the highest thermal stability of 2.85mg and reaction point is 0.07 mg/minute. Several compounds developed during the coating process such as in UB process develop FeCrAl, FeO, γ-Al2O3 and FeCr2O3 compounds and in the UB+EL process FeCrAl, FeO, γ-Al2O3, FeCr2O3, NiO, NaO2, NiAl2O4 and NiCr2O4 compounds. Therefore, UB+EL 30 minutes is the most parameters that are recommended to be applied due to the lowest mass degradation and more compounds.

Page 33 of 51 | Total Record : 503

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