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All Journal Otopro Automotive Experiences Logic : Jurnal Rancang Bangun Dan Teknologi
Hartono, Moh
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Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Performance of Transition Metal Supported Al2O3 Coated on Honeycomb Catalysts and Its Segmentation on Exhaust Gasses Oxidation Buwono, Haris Puspito; Wicaksana, Hangga; Hartono, Moh; Waluyo, Joko; Daroini, Moch. Fauzun; Muslim, Ilham Taufik; Machida, Masato
Automotive Experiences Vol 7 No 1 (2024)
Publisher : Automotive Laboratory of Universitas Muhammadiyah Magelang in collaboration with Association of Indonesian Vocational Educators (AIVE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/ae.10686

Abstract

The oxidation of carbon monoxide (CO) and unburnt hydrocarbons (HC) under segmented honeycomb catalysts was investigated using actual exhaust gas mixtures from a gasoline-fueled internal combustion engine of a motorcycle. The honeycomb catalysts were prepared through a wet process, resulting in four types coated with transition metals (Cu, Cr, Fe, and Ni) supported on Al2O3. The oxidation of CO and HC was monitored using an exhaust gas analyzer across a range of air-to-fuel ratios (AFR), from lean to rich, under stationary conditions. The results demonstrate that the honeycomb catalysts effectively decreased CO and HC concentrations in the exhaust gas. Among the transition metal oxide honeycomb catalysts, Cr and Ni exhibited high CO and HC conversion rates, surpassing those observed with Cu. The average CO and HC conversion calculations, spanning from lean to rich air-to-fuel ratios, were consistent with the actual conversion rates achieved. Furthermore, the study investigated the effect of honeycomb segmentation on CO and HC conversion. Surprisingly, the catalytic performance of Cr and Ni remained high even with longer gaps in the honeycomb. Interestingly, the conversion of CO and HC over the iron oxide honeycomb catalyst increased as the gap in the honeycomb became longer. This is likely due to an increase in the gap size and enhanced re-mixing of reactants (CO, HC, and O2) caused by recirculation. Thus, this study provides valuable elucidation on the potential application of segmented honeycomb catalysts for reducing CO and HC emissions in exhaust gases.
PEMODELAN DINAMIKA FLUIDA PADA FUEL INJECTOR MOTOR BENSIN 4 LANGKAH Khambali, Khambali; Fadhilah, Intan; Hartono, Moh; Farida, Nike Nur
Otopro Vol 20 No 2 Mei 2025
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/otopro.v20n2.p38-43

Abstract

This study aims to model fluid dynamics in the fuel injector of a four-stroke gasoline engine, with a focus on the relationship between fluid pressure and flow rate. The size of the fuel droplet is a key factor that affects combustion efficiency. Droplet size can be controlled through the regulation of injection speed and pressure. In this study, data on injection speed and pressure were collected using an injector tester, injector plunger, and fuel pump tester pressure gauge. The data show that at a higher injection speed (80 m/s), the fuel droplet diameter decreases more rapidly, producing smaller droplets and enhancing combustion efficiency. A similar pattern was observed at higher injection pressures (50 bar), where the droplets atomized more quickly, allowing for a more homogeneous air-fuel mixture. The results illustrate that both higher injection speed and pressure support a more efficient atomization process, reduce emissions, and improve engine efficiency. This study concludes that proper regulation of injection speed and pressure is crucial to optimize engine performance and reduce exhaust emissions. The findings can be used to design more efficient fuel injection systems and provide recommendations for the development of future injection technologies
The Effect of Injection Pressure and Injection Temperature in The Compression Moulding Process on Flashing Defects of Shoulder Products Hartono, Moh; Pratama, Febrian Akbar
Logic : Jurnal Rancang Bangun dan Teknologi Vol. 25 No. 1 (2025): March
Publisher : Unit Publikasi Ilmiah, P3M, Politeknik Negeri Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31940/logic.v25i1.13-18

Abstract

Plastic objects are everywhere: toys, household utensils, playthings, and cosmetic containers. One of the processes used was the plastic production process in the compression molding process to make a cover (shoulder) on the tube. Flashing defects are one of the biggest defects that can cause a product to fail in the assembly of shoulder extrusion tube products in PT. XYZ. This research was to determine the effect of injection pressure and injection temperature parameters on flashing defects in shoulder extrusion tube products. This research uses quantitative research and experimental research methods to collect data. Varying parameter settings carry out this method with an injection pressure of  4 bar, 5 bar, and 6 bar as well as injection temperatures of  250°C, 260°C, and 270°C. The results of the study show that both parameters have significant effects on the flashing defects in shoulder extrusion tube products. The combination of injection pressure of 4 bar and injection temperature of 250°C resulting in flashing defects of 0 mm or no defects.
The Effect of Sengon Wood Powder Particle Size and Composite Composition on The Performance of Non-Asbestos Brake Linings Ridwan, Robby; Hartono, Moh
Logic : Jurnal Rancang Bangun dan Teknologi Vol. 25 No. 1 (2025): March
Publisher : Unit Publikasi Ilmiah, P3M, Politeknik Negeri Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31940/logic.v25i1.1-12

Abstract

The purpose of this study was to determine the effect of particle size and composite composition on the mechanical properties of non-asbestos brake linings. This type of research uses quantitative experiments. There are 3 kinds of variables used, namely a) independent variables consisting of particle size and composite composition; b) dependent variables consisting of hardness value and wear rate value; c) controlled variables consisting of shore D durometer method and Wear Rate with 800 rpm, 120 seconds time, and 20 psi pressure. The data analysis technique uses the factorial anova method because it is to determine the effect of the interaction between particle size and composite composition on brake lining. Data analysis was carried out twice, namely hardness test data and wear rate tests. After that, the data obtained was processed using the Minitab application. The results showed that particle size and composite composition affect the hardness and wear of brake lining. Smaller particle size increases hardness, especially in specimens using Fe composition. The use of iron powder resulted in higher hardness. Iron powders with better mechanical properties showed lower wear rates. The interaction effect of particle size and composite composition on brake lining performance is that the interaction of the two independent variables has a significant effect on brake lining performance.
Co-Authors Daroini, Moch. Fauzun Farida, Nike Nur Haris Puspito Buwono Intan Fadhilah, Intan Joko Waluyo Khambali, Khambali Machida, Masato Muslim, Ilham Taufik Pratama, Febrian Akbar Ridwan, Robby Wicaksana, Hangga