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jes
Published by Yayasan Kawanad
ISSN : 28288106     EISSN : 2828805X     DOI : https://doi.org/10.56347/jes
Core Subject : Engineering,
Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Electrical & Electronics Engineering
The Journal of Engineering Science is not limited to a specific aspect of science and engineering but is instead devoted to a wide range of subfields in the engineering sciences. While it encourages a broad spectrum of contribution in the engineering sciences, its core interest lies in issues concerning material modeling and response. Articles of interdisciplinary nature are particularly welcome. All published article URLs will have a digital object identifier (DOI).
Arjuna Subject : Teknik (semua kategori) - Teknik Kontrol dan Sistem
Articles 5 Documents
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Search results for , issue "Vol. 3 No. 2 (2024): July-December 2024" : 5 Documents clear
Experimental Investigation of Load Effects on Diesel Engine Performance Using Waste Tire Oil Blended with Dexlite Fuel Afkar, Irsyadul
Journal of Engineering and Science Vol. 3 No. 2 (2024): July-December 2024
Publisher : Yayasan Kawanad

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56347/jes.v3i2.257

Abstract

Waste tires represent a form of inorganic waste that resists natural degradation. In Indonesia, estimates suggest around 11 million tons of used tires accumulate annually, with volumes expected to rise each year. This trend poses future environmental challenges. To address this issue, the study examines converting waste tires into fuel oil. The objective focuses on assessing how blending waste tire oil with dexlite influences diesel engine operation. The research involves two phases: testing fuel characteristics from tire oil and evaluating diesel engine performance. Laboratory tests yield tire oil properties including a heating value of 43,080 kJ/kg, viscosity of 1.12 mm²/s, density of 877 kg/m³, and cetane index of 97.1. Blends incorporate tire oil at 30%, 40%, and 50% with dexlite, tested on a diesel engine. Results indicate the highest engine power from the 30% blend (MB-30) at 1.132 HP under 2000 Watt load. The lowest specific fuel consumption occurs with the 50% blend (MB-50) at 0.528 kg/kWh under 1000 Watt load, while the highest thermal efficiency reaches 14.9% with MB-50 under 1000 Watt load.
Evaluation of the Effects of Five Mold Temperature Variations on Cooling Rate and Contraction Force in the Forming of Aluminum 7075 Alloy Pratama, Muhammad David
Journal of Engineering and Science Vol. 3 No. 2 (2024): July-December 2024
Publisher : Yayasan Kawanad

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56347/jes.v3i2.260

Abstract

The 7075 series aluminum alloy, renowned for its tensile strength of up to 572 MPa, is widely employed in the production of aircraft components requiring exceptional structural integrity, such as wing panels, tail assemblies, fuselage frames, and stringers. The airframe, serving as the primary load-bearing structure, is critical in distributing stresses during both flight and ground operations. This study examines the influence of mold temperature variation on thermal contraction and applied force in 7075 aluminum alloy, using the Constrained Rod Casting (CRC) method. Five mold temperature settings—150 °C, 200 °C, 250 °C, 300 °C, and 350 °C—were analyzed to determine their relationship with cooling rate. Data were obtained through cooling curve observations, followed by curve analysis to extract relevant parameters. The results indicate that the fastest cooling rate occurred at 350 °C (25.1 °C/s), while the slowest occurred at 200 °C (13 °C/s). The highest thermal contraction was recorded at 350 °C (316.54 N), whereas the lowest was observed at 150 °C (252.35 N). Variations in cooling rates are attributed to differences in both mold temperature and the duration of the solidification process.
Valuation of Remaining Service Life of H-Beam Steel Structure in the Floating Cafe Bridge at PT. Medco E&P Malaka Alfarezy, Rafie Maulana
Journal of Engineering and Science Vol. 3 No. 2 (2024): July-December 2024
Publisher : Yayasan Kawanad

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56347/jes.v3i2.261

Abstract

Bridges are critical infrastructure requiring optimal structural resilience to ensure safety and operational sustainability. A major threat to steel bridge structures is corrosion, which reduces material thickness and may lead to structural failure if unaddressed. This study evaluates the remaining service life (Remaining Life Assessment, RLA) of the H-Beam steel structure in the Floating Cafe Bridge at PT Medco E&P Malaka by measuring corrosion rates using the Ultrasonic Thickness Gauge (UTG) method. Data were collected from 40 measurement points on the Top Flange, Bottom Flange, and Web Flange of the H-Beam. Analysis revealed that the Top Flange in the right zone exhibited the highest corrosion rate (0.66 mm/year), resulting in a remaining service life of only 9 years. In contrast, the Bottom Flange in the middle zone showed the lowest corrosion rate (0.06 mm/year), with a remaining service life of 205 years. The primary factor accelerating corrosion is the dry-wet cycle caused by humidity, rainfall, and solar drying. The right zone experienced higher corrosion rates due to elevated humidity and poor ventilation. To extend the bridge’s service life, mitigation strategies such as reapplying anti-corrosion coatings, conducting regular Non-Destructive Testing (NDT) inspections, cleaning salt deposits, and improving drainage systems are recommended. These measures will enhance structural reliability and minimize corrosion-related risks.
Deflection Measurement System in Flexible Bars Using Eulerian Video Magnification (EVM) Method Rayyan, Muhammad
Journal of Engineering and Science Vol. 3 No. 2 (2024): July-December 2024
Publisher : Yayasan Kawanad

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56347/jes.v3i2.265

Abstract

Deflection testing plays a pivotal role in assessing a material’s elasticity, which directly influences the safety and operational reliability of engineering structures. This study develops and evaluates a deflection measurement system employing a flexible bar test apparatus, integrating the Eulerian Video Magnification (EVM) technique. EVM enhances imperceptible displacements and motion changes in recorded video, enabling precise deflection observation. Experimental results indicate that EVM-based measurements recorded a peak deflection of 4.6693 mm and a minimum of −4.78208 mm, while accelerometer measurements yielded a peak of 3.7646 mm and a minimum of −3.7685 mm at 3,600 RPM. The results confirm that deflection magnitude increases proportionally with motor speed, aligning with prior research findings. These outcomes demonstrate the viability of EVM as a non-contact, effective method for detecting small-scale motion variations in materials that are difficult to monitor using conventional approaches. The proposed system improves the accuracy and efficiency of deflection measurements, offering significant implications for structural design and engineering analysis.
Heat Transfer Analysis of the Evaporator in Boiler Unit 2, Nagan Raya Steam Power Plant Ramadhan, Sultan
Journal of Engineering and Science Vol. 3 No. 2 (2024): July-December 2024
Publisher : Yayasan Kawanad

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56347/jes.v3i2.266

Abstract

In Indonesia, most power generation facilities employ steam-based systems, including PT PLN Nusantara Power UPK Nagan Raya. To ensure continuous operation, steam power plants must function without operational disruptions, as unplanned shutdowns not only compromise electricity supply but also shorten the service life of associated components. The evaporator, a heat exchanger in the steam boiler, facilitates the phase transition of feedwater from liquid to steam. This research evaluates heat transfer in the evaporator, specifically quantifying the heat transfer rate and assessing the proportion of heat absorbed relative to the thermal energy produced from coal combustion. Measurements were taken under three loading conditions: minimum, medium, and maximum. The maximum heat transfer rate, 184.841 kW, was observed under maximum load, while the lowest, 100.779 kW, occurred under minimum load. Similarly, the highest absorption ratio, 55.49%, was achieved under maximum load, and the lowest, 53.15%, under minimum load. The findings indicate that increased load conditions correspond to higher heat transfer demands, highlighting the influence of loading on both evaporator performance and fuel utilization efficiency.

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