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All Journal TELKOMNIKA (Telecommunication Computing Electronics and Control) Angkasa: Jurnal Ilmiah Bidang Teknologi
Mohamad Zaenudin
Jakarta Global University
Computer Science & IT

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Performance of piezoelectric energy harvesters at various angles Adhes Gamayel; Mohamad Zaenudin; Djoko Setyo Widodo
TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 23, No 6: December 2025
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/telkomnika.v23i6.26860

Abstract

Piezoelectric materials are capable of generating electricity in response to mechanical strain, making them suitable for energy harvesting applications. Piezoelectric energy harvesters (PEHs) are promising alternatives for renewable energy generation, particularly because mechanical strain can be induced in various ways, including utilizing wind flows. This study investigates the performance of a PEH integrated with a laboratory-scale wind-driven micro-windmill. The experiment is carried out by rotating blades of the windmill intermittently; thus, it contacts the PEH, inducing oscillatory motion and generating strain, which finally produces electricity. The configuration angle is varied with 30°, 45°, and 60° to produce variation of power output analyzed in this study. The results demonstrate that a lower configuration angle, specifically 30°, produces the highest voltage near 1.4 V. This is due to the alignment of the applied force with the natural bending direction of the cantilever, resulting in greater induced strain and increased voltage output. Conversely, increasing the configuration angle reduces the effectiveness of force induced to PEH, diminishing strain induction and electrical generation, which only about 1.2 V. The finding of this study can potentially contribute to advance the design and optimization of PEHs for renewable energy applications, particularly in powering microelectronic devices.
Performance of piezoelectric energy harvester with vortex-induced vibration and various bluff bodies Adhes Gamayel; Mohamad Zaenudin; Brainvendra Widi Dionova
TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 21, No 4: August 2023
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/telkomnika.v21i4.24330

Abstract

Piezoelectric energy harvesters (PEHs) are a kind of energy harvester that generates electricity due to pressure or vibration. Vortex-induced vibration (VIV) is a method that utilized wind energy and bluff body to generate the vibration in PEH. The objective of this research was to study the output voltage that generates in different bluff bodies with various airflow velocities. Experimental and simulation have done in this study. Experimental used PEH that consists of piezoelectric bimorph and rectangular-trapezoid fin. Bluff bodies with various cross-sectional areas, namely rhombus, square, and triangle were set up in front of the PEH at a distance of 80 cm. The various air velocities are set up to 5, 7, and 9 m/s in the wind tunnel with a cross-section of 250 mm × 250 mm. The simulation used the finite element method in explore the fluid flow pattern. The rhombus cross-sectional bluff body can generate voltage with an average of 1.5 volts. It is more voltage generated than a square and triangle. A vortex is formed near the rhombus bluff body and generates pressure fluctuation in its wake region. This pressure fluctuation takes place until airflow hits and leads PEH to vibrate and generate the voltage.
Rancang Bangun Mesin Ekstruder Filamen 3D Printing Berbahan Dasar Limbah Botol Plastik PET Muhammad Rifki; Ibnu Hafizh; Anugrah Budi Wicaksono; Mohamad Zaenudin; Alvin Mubarok; Ribut Nawang Sari
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 18, No 3 (2026): Agustus
Publisher : Institut Teknologi Dirgantara Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28989/angkasa.v18i3.3978

Abstract

This research focuses on the design and construction of a 3D printing filament extruder machine using recycled PET plastic bottles as the primary material. The aim is to provide a cost-effective and environmentally friendly solution for producing 3D printing filament. The methodology involves collecting references, designing the machine, and manufacturing the components. The machine utilizes a cartridge heater for melting the PET plastic, a stepper motor for material pulling, and an automatic winding system. The design incorporates a filament guiding system with a limit switch for consistent winding. Calculations were performed to determine the required motor power (1.75 watts) and heater power (58 watts). The results demonstrate the successful conversion of PET plastic waste into standard 1.75 mm diameter filament. The designed extruder machine offers an economical and sustainable alternative for PET plastic waste utilization. Further research should focus on filament quality testing, temperature stability improvement, and production rate optimization
Co-Authors Adhes Gamayel Alvin Mubarok Anugrah Budi Wicaksono Brainvendra Widi Dionova Djoko Setyo Widodo Ibnu Hafizh Muhammad Rifki Ribut Nawang Sari