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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 634 Documents
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Multifunctional performance validation of coconut frond fibre-reinforced composite prototype for automotive interior application Muhammad Habibi; Rizki Suwanda; Wardhiah Wardhiah; Maisarah Maisarah; Muhammad Iqbal; Usman Usman
Jurnal Polimesin Vol 24, No 4 (2026): August
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v24i4.9196

Abstract

The automotive industry increasingly demands sustainable, multifunctional materials for interior components to simultaneously reduce environmental impact and improve occupant comfort. This study presents a comprehensive experimental validation of a coconut frond fibre-reinforced composite prototype intended for automotive door trim panel application. The prototype, developed at Technology Readiness Level (TRL) 2, was evaluated across three critical performance domains: mechanical properties (tensile, flexural, impact, and hardness), acoustic performance (sound absorption coefficient), and thermal characteristics (thermal conductivity and heat deflection temperature). Specimens were prepared and tested in accordance with internationally recognised standards (ASTM D3039, D790, D256, D2240, E1050, E1530, D648). Mean and standard deviation from five replicate specimens per test revealed tensile strength of 28.0 ± 1.4 MPa, flexural strength of 48.1 ± 0.8 MPa, impact toughness of 7.59 ± 0.54 kJ/m², and Shore D hardness of 69.4 ± 1.1. Acoustic evaluation yielded a Noise Reduction Coefficient (NRC) of 0.37 ± 0.01, with a peak absorption coefficient of 0.53 at 1000 Hz, significantly outperforming conventional ABS and PP interior materials. Thermal conductivity was measured at 0.142 ± 0.003 W/mK, which is lower than commercial ABS, while the heat deflection temperature of 93.0 ± 0.9°C exceeds the maximum cabin operating temperature of 85°C. All 11 evaluated parameters met or exceeded their respective automotive-grade target specifications, confirming TRL 3 achievement and suitability for advancement to TRL 4 environmental validation. Scanning electron microscopy (SEM) analysis revealed moderate fibre–matrix interfacial bonding with fibre pull-out as the dominant failure mechanism. The findings establish a robust technical database for the future scale-up and industrial adoption of this bio-based composite.
CFD and experimental investigation of a diffuser-deflector assisted Persian VAWT for urban and industrial airflow energy harvesting Halimin Sobri; Fatahul Arifin; Carlos RS
Jurnal Polimesin Vol 24, No 4 (2026): August
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v24i4.9136

Abstract

Recovering unused kinetic energy from urban and industrial airflow systems provides a potential approach for decentralized renewable energy generation. This study investigated the performance of a Persian Panemone vertical-axis wind turbine (VAWT) integrated with a diffuser and adjustable deflector for airflow energy recovery in confined environments. Computational fluid dynamics (CFD) simulations and laboratory experiments using fan-generated airflow were conducted to evaluate the effects of blade number and airflow conditions on turbine performance. Five- and six-blade configurations were evaluated under different wind speeds. CFD results showed that the 5-blade configuration achieved the highest power coefficient (Cp) of 0.2332 at 2 m/s and maintained a tip speed ratio (TSR) of approximately 1.9. Velocity and pressure contours indicated that the diffuser accelerated the incoming airflow and improved momentum transfer to the rotor. In the experiments, the 6-blade configuration exhibited better starting characteristics, reaching a maximum no-load rotational speed of 260 rpm compared with 213 rpm for the 5-blade configuration. The difference between CFD and experimental results was attributed to non-uniform fan-generated airflow, mechanical friction, electrical loading, and idealized numerical assumptions. The results indicate that the 5-blade configuration provides more favorable aerodynamic performance, whereas the 6-blade configuration provides better starting and rotational characteristics under the tested laboratory conditions. The diffuser–deflector system therefore provides a potential approach for recovering energy from confined urban ventilation and industrial exhaust airflow.
Vibration-based condition monitoring of a centrifugal pump with modified belt coupling configurations Erwin Martianis; Bustami Syam; Ikhwansyah Isranuri; Muhammad Sabri
Jurnal Polimesin Vol 24, No 4 (2026): August
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v24i4.9124

Abstract

Vibration arising from cyclic forces between coupled components can lead to performance degradation and mechanical damage. This study aims to analyze the effects of belt dimensions and installation configurations on the vibration characteristics of a belt-driven centrifugal pump for condition-monitoring applications. Vibration data were collected using an accelerometer integrated with an Arduino-based IoT monitoring system. Experiments were conducted using belt thicknesses of 5.7 and 6.5 mm, widths of 125 and 150 mm, and a fixed belt spacing of 40 mm. Three belt installation configurations, namely Outside–Outside, Outside–Inside, and Inside–Inside, were evaluated. Vibration signals were processed using the Fast Fourier Transform (FFT) to identify dominant frequency components and evaluated in accordance with ISO 10816-3. The results showed that the Outside–Inside configuration produced the lowest vibration level, with a velocity of  0.39 mm/s, corresponding to the “Good” classification. This performance was attributed to more balanced load distribution and smoother force transmission, which reduced dynamic excitation and improved mechanical stability. These findings highlight the importance of belt configuration in improving pump stability and provide useful insights for future condition monitoring and predictive maintenance studies.
Experimental evaluation of a double-pipe heat exchanger for syngas cooling from soaked palm shell gasification Dede Iman Saputra; Novandri Tri Setioputro; Widodo Widjaja Basuki; Muhtar Kosim; Kasda Kasda; Maulana Rachman; Zoffan Wahidi; Aldi Suparman; Yadi Faturohman; Jidan Gustiar; Abiasa Abiasa
Jurnal Polimesin Vol 24, No 4 (2026): August
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v24i4.8273

Abstract

The growing demand for renewable and low-carbon energy has intensified the exploration of biomass residues as alternatives to fossil fuels. Palm shell, an abundant by-product of the palm oil industry, has favorable fixed carbon content and calorific properties for thermochemical conversion through gasification. However, syngas produced from biomass gasification is typically discharged at elevated temperatures, requiring cooling for safe handling and downstream applications. This study experimentally assessed the thermal performance of a water-cooled double-pipe heat exchanger integrated with an open downdraft gasifier using soaked palm shell as feedstock. The evaluation focused on reactor temperature distribution, syngas temperature reduction, heat transfer rate, and cooling effectiveness during continuous operation. The gasification zone, located at a reactor depth of 26–77 cm, maintained a temperature range of 600–900°C during operation. The heat exchanger reduced the syngas temperature from 188.1°C to 35.2°C, corresponding to a heat transfer rate of 1,281.3 W and cooling effectiveness of 97.74% under the tested conditions. These results indicate that the double-pipe heat exchanger provided effective cooling of biomass-derived syngas and can support thermal management in small-scale biomass gasification systems. The results also demonstrate the potential of integrating syngas cooling with downdraft gasification for safer handling and improved downstream compatibility.
Synthesis and characterization of fly ash-derived silica for potential application in solid polymer electrolytes Abiyyu Sayyid Muwaffaq; Sulis Marsudi; Kartika Sari; Evi Yulianti; Sudaryanto Sudaryanto
Jurnal Polimesin Vol 24, No 4 (2026): August
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v24i4.9239

Abstract

The development of sustainable materials for solid polymer electrolytes has encouraged the utilization of industrial waste as a source of functional materials. This study aims to synthesize and characterize silica derived from fly ash using the sol-gel method for potential application in solid polymer electrolyte materials. Silica extraction involved HCl acid treatment, NaOH alkaline dissolution, precipitation, filtration, and drying. Structural and electrochemical properties were characterized using Fourier transform infrared spectroscopy (FTIR) and electrochemical impedance spectroscopy (EIS). FTIR analysis confirmed the formation of amorphous silica through silanol (Si–OH) and siloxane (Si–O–Si) functional groups, with the strongest absorption peak at 1001.55 cm⁻¹ corresponding to Si–O–Si stretching and a broad band at 3374.41 cm⁻¹ associated with hydroxyl groups and adsorbed water. EIS analysis showed frequency-dependent impedance and dielectric behavior over 10¹–10⁶ Hz. The real and imaginary impedance decreased with increasing frequency, indicating reduced polarization and enhanced ion transport. The Nyquist plot exhibited a depressed semicircle and diffusion tail, indicating combined bulk conduction and ion-diffusion behavior. The ionic conductivity reached 1.30 × 10⁻⁶ S/cm. The dielectric constant was highest at low frequencies and decreased with increasing frequency, while dielectric loss approached zero at high frequencies. These results indicate that fly ash-derived silica has structural and electrochemical characteristics suitable for further investigation as a filler in solid polymer electrolyte materials.
Experimental investigation of vibration characteristics in a small-scale rotating system using time- and frequency-domain analysis Salman Salman; I Dewa Ketut Okariawan; Paryanto Dwi Setyawan
Jurnal Polimesin Vol 24, No 4 (2026): August
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v24i4.9142

Abstract

This research stems from the problem that adding unbalance mass to a rotating shaft alters system vibration characteristics, a phenomenon that remains insufficiently quantified in small-scale rotating engines. This study aims to analyze the effects of variations in mass position, radial distance, and rotational speed on the vibration characteristics of a small-scale engine using combined time-domain and frequency-domain approaches. A quantitative experimental design was conducted across 27 treatment combinations, evaluating mass distances (5-25 cm) and speeds up to 860 rpm (14.33 Hz). Data acquisition utilized an accelerometer-microcontroller setup, analyzed via peak acceleration, RMS, and FFT methods. Results show a direct proportional relationship between mass radial distance and vibration amplitude, with the highest response observed at a 25 cm load distance and 860 rpm. The y1-axis exhibited the highest acceleration and RMS values, identifying it as the most sensitive measurement axis for condition monitoring. FFT analysis revealed dominant spectral peaks at the fundamental shaft rotational frequency (approximately 14.3 Hz at 860 rpm), accompanied by sub-synchronous and harmonic components induced by mass imbalance. In conclusion, vibration response in small-scale engines is heavily governed by mass location and rotational speed, underscoring the necessity of strategic sensor orientation for accurate fault detection.
Experimental evaluation of micro-inverters and string inverters for PV array performance under partial shading Muhammad Rayyan Harahap; Ahmad Taqwa; RD. Kusumanto
Jurnal Polimesin Vol 24, No 4 (2026): August
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v24i4.9505

Abstract

Solar photovoltaic (PV) systems are increasingly adopted as renewable energy sources, but their performance is often compromised by partial shading, which reduces efficiency and output. The choice of inverter topology string inverters versus micro-inverters plays a critical role in mitigating shading losses and improving overall system performance. This study aims to experimentally evaluate the performance of micro-inverters compared to string inverters under varying partial shading conditions, focusing on electrical efficiency and economic feasibility. The experiment was conducted in Palembang using four 100 Wp polycrystalline PV panels installed at a 15° tilt and north-facing azimuth. AC power output was measured under four shading levels (0%, 5%, 10%, and 15%) using irradiance meters and wattmeters over 10-hour daily measurement periods. Performance ratio, fill factor, and efficiency were calculated, and Break-Even Point (BEP) analysis was performed to assess economic viability. Micro-inverters achieved 22.98% efficiency compared to 15.96% for string inverters in unshaded conditions. Both systems performed similarly (14.57% vs. 14.40%) at 5% shading. However, at 10% and 15% shading, micro-inverters significantly outperformed string inverters, with efficiencies of 10.40% and 9.87% compared to 4.38% and 1.35%, respectively. BEP analysis revealed that while string inverters reached payback faster under minimal shading, micro-inverters were more economically advantageous when shading exceeded 10%, with string inverter BEP extending to 25.9 years under 15% shading. These results demonstrate that micro-inverters provide greater resilience to partial shading and can offer improved technical and economic performance under shaded operating conditions.
Comparative evaluation of post-weld heat treatment (PWHT) temperature effects on GMAW-welded SS400 and AISI 1045 Steels Rafsanzani Pane; Sudirman Lubis; Benny Oktrialdi; Sawirman Sawirman; Irfan Nofri
Jurnal Polimesin Vol 24, No 4 (2026): August
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v24i4.8885

Abstract

Post-weld heat treatment (PWHT) can modify the microstructure and mechanical properties of welded steels through recovery, recrystallization, and grain growth. This study investigated the effect of PWHT temperature on the mechanical properties and microstructure of SS400 and AISI 1045 steels welded using the gas metal arc welding (GMAW) process. The welded joints were prepared using a single-V groove configuration with a constant welding current of 130 A, ER70S-6 filler metal, and CO₂ shielding gas. After welding, SS400 specimens were subjected to PWHT at 400, 500, and 600 °C, while AISI 1045 specimens were treated at 600, 700, and 800 °C, followed by furnace cooling. Vickers hardness was measured across the base metal, heat-affected zone, and weld metal, while tensile testing was performed on AISI 1045 and SS400 specimens in accordance with ASTM standards. Microstructures were examined using optical microscopy. For SS400, PWHT at 500 °C produced the most favorable hardness response and a more homogeneous ferrite–pearlite microstructure, whereas treatment at 600 °C reduced hardness, consistent with grain coarsening. For AISI 1045, tensile strength decreased with increasing PWHT temperature, while hardness showed an increasing tendency. The highest tensile strength was obtained at 600 °C, whereas higher temperatures promoted microstructural coarsening. These results indicate that PWHT temperature strongly influences the mechanical and microstructural response of GMAW-welded steels and should be selected according to the material and required mechanical properties.
Failure analysis of electric motor due to excessive shaft load using the FMEA method in rice milling units Sunaryo Sunaryo; Wisnu Yogi Pangestu; Abrar Ridwan
Jurnal Polimesin Vol 24, No 4 (2026): August
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v24i4.8211

Abstract

While Failure Mode and Effect Analysis (FMEA) has been widely applied in heavy industries, its application in the mid-scale agro-industrial sector remains highly limited. This study addresses this critical gap by analyzing the mechanical failure of electric motors in Rice Milling Units (RMUs) within the Lappariaja District, focusing specifically on the synergistic impact of excessive shaft loading and high-particulate environments on motor longevity. Adopting a descriptive quantitative approach, this research integrates multi-modal data collection, including field observations, technical measurements using digital multimeters, and operator interviews. The FMEA framework was applied to calculate the Risk Priority Number (RPN) for each prominent failure mode. The empirical findings reveal that the Stator Winding is the most critical vulnerability, with the highest RPN of 252, due to a severe "thermal trap" phenomenon in which rice husk dust acts as an unwanted thermal insulator. This is closely followed by bearing wear with an RPN of 224. Scientifically, this study contributes a tailored risk-priority framework that maps the ways in which environmental stressors accelerate mechanical degradation under excessive loads. Industrially and operationally, this research delivers a predictive maintenance roadmap and prioritized intervention schedule for RMU operators. Shifting the paradigm from reactive "fix-when-broken" habits to targeted maintenance prevents catastrophic motor failure, minimizes operational downtime, and eliminates costly total replacements, thereby safeguarding local food security and rural economic stability.
Microstructure, hardness, and electrical conductivity of Cu-Ni-FeCNT composites produced by powder metallurgy Lidia Shabrina Aulia; Suprianto Suprianto; Bakhrul Ilmi; Mahadi Mahadi
Jurnal Polimesin Vol 24, No 4 (2026): August
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v24i4.9101

Abstract

Metal matrix composites based on Cu-Ni and FeCNT are promising materials for engineering applications requiring a combination of mechanical and electrical properties. However, the addition of alloying elements and reinforcement can reduce the electrical conductivity of Cu. This study aimed to enhance the hardness of Cu-Ni-FeCNT composites while maintaining adequate electrical conductivity by applying FeCNT pre-milling treatment. FeCNT was first milled by mechanical alloying for 3 h at 1000 rpm and subsequently mixed with Cu and Ni powders by horizontal milling for 2 h at 300 rpm. The powder mixtures were warm-compacted at 200°C and 250 MPa and then sintered at 770°C. The effects of FeCNT content and pre-milling on crystal structure, microstructure, hardness, and electrical conductivity were investigated using X-ray diffraction and other characterization methods. The X-ray diffraction results indicated that the main phase in the powders and sintered composites had a face-centered cubic structure. Pre-milled FeCNT promoted a more uniform microstructure and reduced porosity within the Cu-rich matrix. Increasing FeCNT content increased Vickers hardness, with the highest value of 102.9 HV obtained for the composite containing 7 wt.% pre-milled FeCNT. The same composite exhibited an electrical conductivity of 65.45 % IACS, approximately 18.8% higher than the corresponding composite prepared without pre-milling. These results indicate that FeCNT pre-milling can improve the balance between hardness and electrical conductivity in Cu-Ni-based composites.

Page 63 of 64 | Total Record : 634

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