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p-Index From 2021 - 2026
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All Journal Mechatronics, Electrical Power, and Vehicular Technology Indonesian Journal of Science and Technology
Poetro Sambegoro
Institut Teknologi Bandung
Computer Science & IT Electrical & Electronics Engineering Environmental Science

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Bacterial Cell Inactivation Using a Single-Frequency Batch-Type Ultrasound Device Poetro Sambegoro; Maya Fitriyanti; Bentang Arief Budiman; Kamarisima Kamarisima; Sekar Wangi Arraudah Baliwangi; Calvin Alverian; Saeed Bagherzadeh; Ganesan Narsimhan; Pingkan Aditiawati; Ignatius Pulung Nurprasetio
Indonesian Journal of Science and Technology Vol 6, No 1 (2021): IJOST: VOLUME 6, ISSUE 1, April 2021
Publisher : Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/ijost.v6i1.31516

Abstract

Ultrasound technology employs cavitation to generate high-pressure soundwaves to disrupt bacterial cells. This study reveals the effectiveness of a single frequency ultrasound device for bacterial cell inactivation. A low-cost ultrasound device having a single frequency, i.e. 22 kHz for lab-scale application, was developed first, and the prototype was mechanically designed and analyzed using the finite-element method to assure the targeted natural frequency could be achieved. The prototype was then tested inactivating bacterial cells, Escherichia coli (E. coli) and Bacillus subtilis (B. subtilis), in a simple medium and a food system, and the results were then compared to a commercial system. A treatment time of up to 15 minutes was able to reduce E. coli and B. subtilis cells by 3.3 log and 2.8 log, respectively, and these results were similar to those of the commercial system. The effectiveness of bacterial cell inactivation using the developed single-frequency ultrasound device is then discussed. The findings are useful for designing low-cost ultrasound devices for application in the food industry.
Analytical optimization of displacer trajectory for ideal beta-type stirling engine cycles with sinusoidal piston motion Rachman Hakim; Toto Hardianto; Priyono Sutikno; Poetro Sambegoro
Journal of Mechatronics, Electrical Power, and Vehicular Technology Vol 17, No 1 (2026)
Publisher : National Research and Innovation Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/j.mev.2026.1486

Abstract

This study develops a generalized displacer motion equation for a beta-type Stirling engine. The proposed equation approximates the ideal Stirling cycle while maintaining sinusoidal piston motion to ensure stable power extraction. The displacer trajectory is modeled with a Fourier series and optimized. The resulting trajectory is then generalized as a piecewise function to improve applicability across different geometries. This approach improves control of working fluid distribution, allowing the expansion and compression processes to more closely approach isothermal conditions. The results show that the optimized Fourier trajectory achieves 91.9 % of the ideal Stirling-cycle work output, outperforming conventional drive mechanisms, where it only achieves 59.8 % for crank mechanism, 66 % for Scotch yoke, and 68.5 % for rhombic drive. For practical implementation, the optimized Fourier trajectory is generalized using a piecewise formulation. The generalized trajectory maintains approximately 80–90 % of the ideal Stirling-cycle work over a range of compression ratios without requiring re-optimization. These results demonstrate that the proposed approach provides both high thermodynamic performance and improved adaptability compared with conventional Stirling engine drive mechanisms.
Co-Authors Budiman, Bentang Arief Calvin Alverian Fitriyanti, Maya Ganesan Narsimhan Hardianto, Toto Ignatius Pulung Nurprasetio Kamarisima Kamarisima Pingkan Aditiawati Priyono Sutikno Rachman Hakim Saeed Bagherzadeh Sekar Wangi Arraudah Baliwangi