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Ishak
Politeknik Negeri Ujung Pandang
Automotive Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Investigating the Influence of Alumina Additive Concentrations on specific Fuel Consumption and Exhaust Opacity in Biodiesel Fuel Muh Abdillah; Nurhidayanti; Ariawan Bayu Wicaksono; Ishak
METAL: Jurnal Sistem Mekanik dan Termal Vol. 9 No. 2 (2025): Jurnal Sistem Mekanik dan Termal (METAL)
Publisher : Department of Mechanical Engineering, Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/metal.9.2.117-121.2025

Abstract

This study investigates the effect of alumina (Al2O3) nanoparticle additives on the performance and emission characteristics of B30 biodiesel fuel under various engine loads. Fuel samples of pure B30 and B30 blended with Al2O3 at concentrations of 30, 50, 70, and 90 ppm were tested using a 3.5 kW diesel engine. The evaluation focused on specific fuel consumption (SFC), and exhaust opacity at loads of 1, 5, and 9 kg. The results show that SFC generally decreased with increasing load, with the lowest values achieved at 90 ppm, indicating improved combustion efficiency. In terms of emissions, the addition of Al2O3 at 30–50 ppm significantly reduced opacity, with 50 ppm showing the greatest effect, particularly at high loads. However, higher concentrations such as 90 ppm tended to increase opacity due to nanoparticle agglomeration, which hinders homogeneous mixing and combustion. Overall, the optimal performance improvement was observed at 50 ppm for emission reduction and at 90 ppm for fuel efficiency, demonstrating the potential of Al2O3 nanoparticles as effective additives in biodiesel applications.
Development of Control System for TU-2A CNC Machine Ariawan Bayu Wicaksono; Lewi; Muh. Abdillah; Nurhidayanti; Ishak
METAL: Jurnal Sistem Mekanik dan Termal Vol. 10 No. 1 (2026): METAL : Jurnal Sistem Mekanik dan Termal
Publisher : Department of Mechanical Engineering, Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/metal.10.1.43-54.2026

Abstract

This study aims to design and develop an electronic control system for the TU-2A CNC machine to improve its performance, simplify the programming process, and facilitate machine maintenance and repair procedures. The method used is retrofitting the EMCO TU-2A CNC machine by replacing the old electronic components with more modern and affordable components, without compromising the machine's precision. Calibration is carried out to ensure the accuracy of the machine's movement, while machine testing is conducted by machining workpieces made of teflon (PTFE) and aluminum. The results of the study indicate that after the development and maintenance, the CNC TU-2A machine showed improvements in precision and ease of use. The machine's error remains within the tolerance limit, approximately 0.01 to 0.02 mm, indicating that the calibration was successful. The conclusion of this study is that the development of the new electronic control system has made the CNC TU-2A machine more efficient and easier to maintain, making it more suitable for use in vocational education.
Co-Authors Ariawan Bayu Wicaksono Lewi Muh Abdillah Muh. Abdillah Nurhidayanti