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All Journal Mekanika: Majalah Ilmiah Mekanika IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA)
Nur Afiqoh, Nabella Sofa
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Automotive Engineering Energy Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Simulasi dan Pembuatan Prototipe Generator Listrik Bertenaga Langkah Mekanis untuk Aplikasi Energi Terbarukan Nur Afiqoh, Nabella Sofa; Trisnoaji, Yuki; Novena, Nindia Nova; Atha, Muh Farhan
IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) Vol 4 No 3 (2025): Desember
Publisher : CV. IRA PUBLISHING

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56862/irajtma.v4i3.329

Abstract

The design and fabrication of a Mechanical Footstep Power Generator was developed as an innovative approach to harness kinetic energy from footsteps and convert it into electrical energy. Using a fabrication analysis and Design for Assembly (DFA) method, the prototype was designed to be both efficient and easy to assemble. The system consists of nine primary components, including the top plate, bottom plate, gear plate, gear, pinion, spring, dynamo (DC), long bolt M12, and nut. Fabricated parts were processed through tapping, drilling, milling, grinding, shaping, and chamfering, while other components were commercially purchased. DFA analysis indicated a medium level of assembly complexity, with potential errors mitigated by applying error proofing and systematic assembly guidelines. Experimental testing demonstrated a consistent increase in electrical output corresponding to the number of steps applied, starting from 2.96 V and 0.0074 W at the first step, reaching 5.71 V and 0.051961 W at the twentieth step. These results confirm that the prototype can reliably convert mechanical energy into electrical energy, though its application is currently limited to low-power usage. Nevertheless, the system presents significant potential for future development aimed at improving efficiency, capacity, and broader applicability in renewable energy solutions.
Optimizing Energy Efficiency in Vertical Axis Wind Turbines: A CFD Analysis of Inlet Velocity and Fluid Type Impact Nubli, Haris; Baek, Seung Jun; Nur Afiqoh, Nabella Sofa; Trisnoaji, Yuki; Prasetyo, Singgih Dwi
Mekanika: Majalah Ilmiah Mekanika Vol 24, No 2 (2025): MEKANIKA : Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v24i2.104188

Abstract

The development of Vertical Axis Wind Turbines (VAWTs) has become a key focus in renewable energy utilization due to their ability to operate at low wind speeds and their simple design. This study aims to analyze the effects of inlet velocity variations and fluid physical properties on flow patterns, turbulence, and kinetic energy in VAWTs. The simulation was conducted using the Computational Fluid Dynamics (CFD) method, based on ANSYS Fluent, for a 2D turbine model with a diameter of 12 cm. Inlet velocity variations of 10, 11, 12, 13, and 14 m/s were tested using three types of fluids: air, helium, and hydrogen. The results show that increasing inlet velocity transforms the flow pattern from stable to complex, with greater turbulence forming behind the cylinder. Air exhibited the highest kinetic energy at low to medium velocities, ranging from 10 to 12 m/s, which was up to 24.7% higher than that of helium and 3.8% higher than that of hydrogen. At higher velocities, 13–14 m/s, the kinetic energy difference among the three fluids decreased to less than 1.5%. Furthermore, outlet velocity was consistently higher than inlet velocity for all fluids, with hydrogen achieving the highest acceleration at 14 m/s.
Optimization of Photovoltaic Performance Through the Integration of a Heatsink–Blower Cooling System Under Solar Simulator Testing Conditions Prasetyo, Singgih Dwi; Farid, Muh. Farhan Atha; Fernandio Prasetyo, Tyo Febrino; Nur Afiqoh, Nabella Sofa; Novena, Nindia Nova; Trisnoaji, Yuki; Lumban Gaol, Mangisi Larixon; Sinaga, Febrianto; Kombe, Godlisten Gladstone; Shame, Buruhan Haji
Mekanika: Majalah Ilmiah Mekanika Vol 25, No 1 (2026): MEKANIKA : Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v25i1.114555

Abstract

This study examines the impact of a heatsink-based cooling system, combined with forced airflow, on the thermal and electrical performance of a photovoltaic (PV) module under controlled irradiance conditions provided by a solar simulator. The cooling configuration employed is energy-efficient and straightforward, utilizing active convection enhanced by a blower in selected trials. Two primary conditions were compared: PV without cooling and PV with different cooling configurations. The experimental results indicate that the PV + Heatsink + Blower configuration achieved the highest average electrical efficiency of 13.43%, whereas the PV Only configuration recorded the lowest, 12.45%. This difference demonstrates that temperature regulation through a combination of heatsink and assisted airflow significantly improves electrical energy conversion. Furthermore, maintaining a lower, more stable operating temperature contributes to consistent power output and reduces heat accumulation, which can accelerate performance degradation. Overall, the findings suggest that integrating a low-energy, straightforward cooling design can be an effective strategy to enhance PV performance, particularly in testing environments that use a solar simulator.
Co-Authors Atha, Muh Farhan Baek, Seung Jun Farid, Muh. Farhan Atha Fernandio Prasetyo, Tyo Febrino Kombe, Godlisten Gladstone Lumban Gaol, Mangisi Larixon Novena, Nindia Nova Nubli, Haris Shame, Buruhan Haji Sinaga, Febrianto Singgih Dwi Prasetyo Trisnoaji, Yuki