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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
Mechanical Engineering - Energy Conversion Engineering - Material Engineering - Manufacturing Technology - Mechatronics - Machine and Mechanism Design - Biomechanics
Arjuna Subject : Teknik (semua kategori) - Teknik Mesin
Articles 20 Documents
 1   2 
Search results for , issue "Vol 23, No 2 (2025): April" : 20 Documents clear
Material selection for coal flow breaker plate based on fatigue life analysis using finite element method Lubis, Asnawi; Hadi, Kiagus Abdul; Akmal, Jamiatul; Badaruddin, Mohammad
Jurnal Polimesin Vol 23, No 2 (2025): April
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i2.5407

Abstract

Fatigue failure in the coal flow breaker plate of the CV507 screen at PT. Bukit Asam–Tarahan Port has led to production delays and increased maintenance requirements. This study investigates the optimal material selection for the coal flow breaker plate based on fatigue life under bulk impact loading. The structure, modelled as a fixed vertical plate, was analyzed using the Finite Element Method (FEM) with two material options: ST37 and ST52, each at thicknesses of 15 mm and 20 mm. Static structural and explicit dynamic simulations were performed in ANSYS, using an impact load of 15 kN measured from site conditions. The results indicate that ST52 with a 15 mm thickness experienced the highest von Mises stress (2,223.4 MPa) and deformation (14.41 mm). Increasing the thickness to 20 mm reduced stress to 1,465.4 MPa and deformation to 10.99 mm, extending fatigue life to 8.54 months, making it the most suitable option. These findings provide a basis for selecting materials that enhance durability and minimize downtime in coal processing operations.
Numerical simulation of the effect of synthetic jet actuators on aerodynamic performance in high-lift device configurations Yamin, Mohamad; Apriyadi, Kukuh Ivan; Firmansyah, Riyan
Jurnal Polimesin Vol 23, No 2 (2025): April
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i2.6208

Abstract

The aviation industry faces significant challenges in reducing environmental impacts, particularly fuel consumption and  noise pollution.  To  address  these  issues,  various  aerodynamic optimization and flow control technologies have been developed to enhance aircraft efficiency. One promising approach is Active Flow Control (AFC), particularly in wing-flap configurations. However, cambered flaps can induce flow separation, leading to increased drag and reduced aerodynamic performance. This study investigates the application of AFC using Zero Net Mass Flux (ZNMF) to mitigate flow separation and improve aerodynamic efficiency. Numerical simulations were conducted using ANSYS Fluent, employing the Delayed Detached Eddy Simulation –Spalart-Allmaras (DDES-SA) turbulence model to accurately capture flow separation and vortex structures. The research explores a novel ZNMF geometry, analyzing different frequency and velocity parameters to determine the optimal settings for suppressing flow separation. The results demonstrate that  the  Synthetic  Jet  Actuator  (SJA)  significantly enhances aerodynamic efficiency by optimizing the CL/CD  ratio through drag reduction without major lift loss. Optimal performance is achieved at frequencies of 150–300 Hz and jet velocities of ≥150 m/s, stabilizing airflow, reducing flow separation, and suppressing vortex formation. At an AOA of 0°, a frequency of 100 Hz provides the greatest CL reduction, while at an AOA of 10°, frequencies of 100–250  Hz  substantially improve  the  CL/CD   ratio.  This  study confirms that SJA is an effective strategy for drag reduction and aerodynamic optimization. These findings highlight its potential to improve aircraft performance, reduce fuel consumption and CO₂ emissions, and contribute to more sustainable aviation technology
Fabrication and mechanical characterization of binderless boards from sugarcane bagasse fibers Hasanuddin, Iskandar; Faurantia, Faurantia; Mawardi, Indra
Jurnal Polimesin Vol 23, No 2 (2025): April
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i2.6078

Abstract

Agricultural   waste  management  is  a  pressing  environmental concern, as traditional disposal methods like incineration contribute to pollution. This study explores the fabrication and evaluation of binderless boards made from sugarcane bagasse fibers, eliminating the need for synthetic binders. Bagasse fibers were processed at mesh sizes of 20 and 40, then hot-pressed at 190°C under 9.6 MPa pressure for 15 and 25 minutes, achieving a targeted thickness of 10 mm. The physical and mechanical properties, including density, water absorption, thickness swelling, Modulus of Rupture (MOR), and Modulus of Elasticity (MOE), were analyzed. Results showed that particle size and pressing time significantly influenced board properties. The highest performance was  observed in  the  E25 sample (40-mesh, 25-minute pressing), with  a  density of  0.52 g/cm³, MOR of 2.69 MPa, MOE of 293.82 MPa, water absorption of 134.66%, and thickness swelling of 16.80%. These findings suggest that optimizing particle size and pressing conditions enhances binderless board strength and dimensional stability, making sugarcane bagasse a viable raw material for sustainable panel production.
Prediction of aluminum alloy mechanical properties using synthetic data generated by generative adversarial networks Utami, Lega Putri; Armijal, Armijal; Leni, Desmarita; Kasmar, Andre Febrian
Jurnal Polimesin Vol 23, No 2 (2025): April
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i2.6084

Abstract

Machine learning models are widely used to predict the mechanical properties  of aluminum  alloys.  However,  their  accuracy  is  often hindered   by  the  scarcity  of high-quality   tensile  test  data,  as experimental   data  collection  is  costly  and  time-consuming.  To address this limitation, this study employs Generative Adversarial Networks  (GANs)  to  generate   synthetic   tensile  test  data  for aluminum alloys, improving the accuracy of predictive models. The dataset consists of 200 real samples containing the compositions of nine chemical elements and two mechanical properties-Yield Strength (YS) and Ultimate Tensile Strength (UTS). A trained GAN model   was  used  to  generate   1,000  synthetic  samples,  whose statistical similarity to the original dataset was validated using the Kolmogorov-Smirnov (KS)  test and Pearson  correlation  analysis. The results confirmed  that all synthetic variables  retained  similar distributions and correlation patterns to the original dataset. To evaluate the impact of synthetic data on predictive  accuracy,  three machine learning algorithms-Random Forest Regressor (RF), Gradient Boosting Regressor (GBR), and Ada Boost Regressor (ABR)-were tested under two training schemes: (1) synthetic data for training and real data for testing and (2) real data for both training and testing. The RF model showed the highest improvement in UTS prediction,  with reductions of 38.3% and 46.3% in Mean Absolute Error (MAE) and Root Mean Square Error (RMSE),  respectively. The GBR model exhibited notable enhancements in YS prediction, with MAE and RMSE reductions of22.5% and 28.3%. These results demonstrate that GAN-generated  synthetic data is highly effective in  improving  machine  learning  predictions   of aluminum  alloy properties, particularly when experimental data is limited.
Fabrication and mechanical properties of copper and silicon carbide-reinforced aluminum metal matrix composites processed by powder metallurgy Endramawan, Tito; Kusmayadi, Adi; Suwandi, Dedi; Hudayef, Ayatullah
Jurnal Polimesin Vol 23, No 2 (2025): April
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i2.6238

Abstract

Metal-matrix composites (MMCs) offer superior mechanical properties, making them ideal for advanced engineering applications. However, achieving optimal strength and hardness remains a challenge. This study investigated the role of copper (Cu) reinforcement in enhancing the mechanical performance of aluminum-silicon carbide (Al-SiC) composites fabricated via powder metallurgy. Composites were synthesized with 5 wt.% and 10 wt.% Cu and sintered at 500°C, 550°C, and 600°C. The results indicate that increasing Cu content significantly improved hardness and bending strength, with the 80%Al–10%Cu– 10%SiC composition exhibiting the highest hardness (96.86 kg/mm²) and bending strength (29.08 MPa) at 600°C representing a 37.86% and 74.03% increase, respectively, compared to the 5 wt.% Cu composites. Microstructural analysis confirmed uniform Cu and SiC dispersion, improved matrix bonding, and reduced porosity at elevated sintering temperatures. These findings highlight the potential of Cu-reinforced AlSiC composites for high-performance applications, particularly in wearresistant and structural components.
Fabrication and characterization of antioxidant biodegradable plastic from mangrove starch, chitosan, and clove essential oil Syaubari, Syaubari; Dawood, Jimmy; Zaki, Muhammad; Bachtiar, Dandi
Jurnal Polimesin Vol 23, No 2 (2025): April
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i2.6394

Abstract

The development of  biodegradable plastics offers a  sustainable alternative to conventional ones, reducing environmental impact. This research is the fabrication and characterization of biodegradable plastic films derived from large-leafed mangrove (Bruguiera gymnorrhiza) starch, chitosan, and clove essential oil (CEO)  as  an  antioxidant  additive.  Glycerol  was  used  as  a plasticizer, while carboxymethyl cellulose (CMC) and carrageenan were incorporated as thickeners. The effects of glycerol (2.7–9 ml), chitosan (4– 6% m/m), and CEO (0–8% m/m) concentrations on mechanical properties, morphology, and biodegradability were examined. Fourier-transform infrared (FTIR) spectroscopy confirmed the successful incorporation of chitosan and CEO. Scanning electron microscopy (SEM) revealed surface roughness and cavities due to incomplete chitosan dissolution. The optimized formulation (3% starch, 5 ml glycerol, 5% chitosan, and 5% CEO) exhibited superior mechanical properties, with a tensile strength of 710.98 MPa, Young’s modulus of 582.65 MPa, and elongation at break of 121.4%. Soil burial tests demonstrated complete degradation within 14 days. These findings highlight the potential of mangrove starch-based bioplastics for food packaging and eco-friendly applications.
Analysis of mechanical properties, microstructure, and distortion of Al6061-T6 alloys plate using GTA and GMA welding process Suherman, Suherman; Muharnif, Muharnif; Marzuki, Marzuki; Lubis, Yusuf; Pohan, Muhammad Ade syahputra; Aulia, Rakha Ramdan; Ali, Rizki M; Abdullah, Ilmi; Wan Hamzah, Azmi
Jurnal Polimesin Vol 23, No 2 (2025): April
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i2.6261

Abstract

This study compares the effect of filler metal and welding current of gas tungsten arc welding (GTAW) and gas metal arc welding (GMAW) on Aluminium alloy Al6061-T6. Three different filler metals, ER4043, ER4047, and ER5356, were used with the GTAW welding process. The welded joints were created at three different welding currents (120, 130, and 140 A) by the GMAW with filler metals ER5356. Optical and scanning electron microscopy (SEM) is used to analyze the surface fracture of impact test welding joints. The results showed that the GMAW process had the most optimum Ultimate Tensile Strenght (UTS) compared to the GTAW welding joint, especially for welding current 130 A. The impact strength of ER4047 filler metal with the GTAW process is higher than other joints (61 J/cm2). Optimum conditions were obtained by the GMAW welding process using a welding current of 130 A with maximum tensile strength and impact strength of 350 MPa and 53 J/cm2, respectively. SEM analysis showed obtained Mg2Si a globular morphology in ER4047 and ER5356 filler metals, and the dimples fracture is indicated at all joints with the GMAW and GTAW processes. Furthermore, increasing welding current by the GMAW process causes higher angular distortion, reduced vickers hardness but does not significantly affect the weld bead. Overall, the GMAW produces better physical and mechanical properties of weld joint compared to GTAW for all types of filler metals but results in greater angular distortion
Design and efficiency optimization of off-grid solar-wind hybrid power systems in Bahuluang tourism village Hidayat, Akmal; Mudarris, Mudarris; Fakhri, M. Miftach; Iriandy, Iriandy; Rahman, M. Haristo
Jurnal Polimesin Vol 23, No 2 (2025): April
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i2.5636

Abstract

Access to reliable and sustainable energy remains a critical challenge in remote regions, limiting socio-economic growth and the development of tourism-based communities. In line with Indonesia’s Net Zero Emissions (NZE) targets and national energy equity initiatives, this study explores the planning and efficiency optimization of a Hybrid Renewable Energy System (HRES) for Bahuluang Tourism Village. The proposed off-grid system integrates wind turbines, solar Photovoltaic (PV) panels, and battery storage to minimize fossil fuel dependence and environmental impact. Using literature review and simulation-based analysis with HOMER software, the study identifies an optimal configuration comprising 172.77 kW of solar PV, 36.82 kW of wind turbines, 98 batteries (1.2 kWh each), and a 50-kW inverter. The system generates approximately 209,851 kWh annually—82.4% from wind and 17.6% from solar—efficiently meeting the local demand of 424.1 kWh per day. This hybrid system supports sustainable energy access, reduces carbon emissions, and promotes the energy transition in line with Indonesia’s clean energy goals.
Modification of sugarcane bagasse as polymer composite reinforcement via alkalization and benzylation Thalib, Sulaiman; Zakaria, Sarani; Azhari, Che Husna; Muhammad, Ikramullah; Usman, Husni
Jurnal Polimesin Vol 23, No 2 (2025): April
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i2.6404

Abstract

This research evaluates the impact of chemical modification on the thermal, structural, chemical, and mechanical properties of sugarcane bagasse particles for their application as reinforcement in polymer composites, which was conducted through alkalization and subsequent benzylation. Sugarcane bagasse was first mechanically refined, then treated with sodium hydroxide to produce alkalized bagasse (ALC), followed by etherification with benzyl chloride to yield benzylated bagasse (BLC). The untreated and modified particles were characterized using TGA, DSC, XRD, FTIR, and tensile testing. Thermal analysis showed degradation temperaturesof 250 °C, 245 °C, and 240 °C for untreated, ALC, and BLC, respectively. XRD revealed a decrease in crystallinity after treatment, indicating increased amorphous content due to surface modification. FTIR confirmed the replacement of hydroxyl groups with benzyl groups, enhancing hydrophobicity. Mechanical testing demonstrated a significant improvement in the tensile strength and modulus of PA6 composites reinforced with BLC, with the highest values (49.5 MPa and 1224.3 MPa) achieved using 100 µm BLC particles. These results highlight the effectiveness of chemical modification in improving interfacial compatibility and mechanical performance, supporting the use of modified bagasse as a sustainable reinforcement for bio-based composites.
Impact of angle cap and water-filled blade modification on the output of overshot waterwheels Afandi, Rizki Afif; Mugisidi, Dan; Parwatmoko, Giri; Heriyani, Oktarina
Jurnal Polimesin Vol 23, No 2 (2025): April
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i2.6543

Abstract

The utilization of water resources as renewable energy through waterwheels presents an environmentally friendly alternative, however, its efficiency requires improvement through technological modification. This research investigates two design modifications: a 45° Angle Cap (AC) and a Water-Filled Angle Cap (WFAC), in comparison with a waterwheel without a Cap (WC). Experiments were conducted at discharges from 1 to 10 m³/h with a constant torque load of 0.05 N-m. The highest efficiency of 57.08% was achieved in the AC 45° configuration at 1 m³/h, generating 1.09 watts of power, while the WFAC 45° yielded the highest power output of 2.88 watts at 10 m³/h with an efficiency of 14.50%. Although increasing discharge generally led to higher power input, it was accompanied by a decrease in efficiency across all configurations. Among all three variations, WFAC 45° demonstrated superior performance at higher discharges, indicating its potential for enhancing the power and efficiency of overshot waterwheels. 

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