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INDONESIA
Journal of Engineering and Applied Technology
Published by Universitas Negeri Yogyakarta
ISSN : 27162257     EISSN : 27162265     DOI : https://doi.org/10.21831/jeatech
Core Subject : Engineering,
Automotive Engineering Civil Engineering, Building, Construction & Architecture Electrical & Electronics Engineering Engineering Mechanical Engineering
Journal of Engineering and Applied Technology (JEATech) is an open-access double-blind peer-reviewed journal of Engineering, Technology, and Applied Technology. Authors are invited to disseminate theoretical and practice-oriented topics relevant to: Electrical Engineering Electronic Engineering Informatics engineering Computer Science Mechatronics Engineering Mechanical Engineering Automotive Engineering Civil Engineering Industrial Engineering Applied technology related to the previous fields of engineering
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 67 Documents
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Energy and exergy analysis of coal-fueled fire tube alstom boiler using direct method: case study at garment factory Trikusuma, Septian; Susastriawan, A.A.P.; Rusianto, Toto
Journal of Engineering and Applied Technology Vol. 6 No. 02 (2025): (August)
Publisher : Faculty of Engineering, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jeatech.v6i02.88002

Abstract

This research analyze the energy and exergy efficiency of coal-fueled fire tube Alstom boiler operating for five years (2019 – 2024) in garment factory using the direct method. Energy efficiency reflects how effectively coal energy is converted into steam, while exergy efficiency assesses the portion of that energy available for useful work. Results indicate a decline in energy efficiency from 75.92% in the first year to 65.47% in the fifth year due to scale buildup, increased heat loss through blowdown and flue gas, and component degradation. Similarly, exergy efficiency dropped from 24.45% to 22.00%, primarily due to heat loss from boiler walls and steam pipes, high-temperature flue gas, and combustion inefficiencies. A temporary efficiency increase in the fourth year resulted from improved maintenance, but the decline continued in the fifth year. These findings emphasize the need for regular maintenance and combustion optimization. Measures such as routine cleaning, fuel quality monitoring, and thermal insulation improvements can mitigate energy losses and enhance efficiency. Implementing these strategies can sustain or improve energy performance, contributing to industrial sustainability through more efficient energy consumption.
PID Control System for Shaking Table and Bearing Capacity Measurement on Soil Liquefaction Simulator Setiowati, Sulis; Sanubari, Agung; Nuraulia Rahmah, Firly; Salimah, A'isyah; Yelvi
Journal of Engineering and Applied Technology Vol. 6 No. 02 (2025): (August)
Publisher : Faculty of Engineering, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jeatech.v6i02.84749

Abstract

Liquefaction occurs when soil that was previously stable and solid suddenly loses its strength and stiffness within a short period. This research develops a model for testing soil liquefaction using a 1-g shaking table. The system, based on LabVIEW, is designed to measure and analyze the performance of foundations during soil liquefaction tests. It enables the evaluation of soil characteristics before, during, and after an earthquake that could induce liquefaction, while also considering foundation reinforcement. In this study, the Ziegler-Nichols PID tuning method was employed to improve control accuracy and stability during seismic vibration simulations and to measure soil bearing capacity. The results indicate that the system achieved a rise time of 8 seconds, a delay time of 13 seconds, an overshoot of 0.06%, a settling time of 13 seconds, and a steady-state error of 0.02%. Compared to the Trial Error method, the Ziegler-Nichols method achieves faster rise time, delay time, and settling time but results in higher overshoot and steady-state error. The sensor data provides detailed information about the helical pile's ability to support vertical loads, with an average bearing capacity of 3.99 kPa.
Innovation in the Development of a CO₂ Laser Cutting Machine: Experimentation on Cutting Quality and Machine Precision Sutopo; Sasongko, Beni Tri; Farih Kurniawan; Virda Hesy Lutviana Saputri; Muhammad Imawan Badranaya; Abdul Aziz Nugroho; Septianto Budi Pranata
Journal of Engineering and Applied Technology Vol. 6 No. 02 (2025): (August)
Publisher : Faculty of Engineering, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jeatech.v6i02.90321

Abstract

In the era of Industry 4.0, CO₂ laser cutting technology has been increasingly adopted across manufacturing, creative industries, and vocational education due to its precision, flexibility, and non-contact process. However, wood-based composites such as Medium Density Fibreboard (MDF) present challenges in laser machining, including thermal deformation, carbonization, and surface damage, necessitating further investigation into process parameters. This study designed and developed a CNC CO₂ Laser Cutting Machine with a 60 W laser source, dimensions of 160 × 100 × 85 cm, and a working area of 110 × 72 × 2 cm, integrating mechanical, optical, and control systems to improve efficiency and precision. The research method involved prototype design, fabrication, assembly, and iterative trials on acrylic, plywood, and MDF, with adjustments made to optimize power, cutting speed, and control stability. Surface roughness tests showed significant variation across materials, with MDF achieving an average Ra value of 6.25 µm (smooth) and acrylic achieving 0.85 µm (very smooth), indicating that acrylic provides superior aesthetic and precision outcomes, while MDF remains suitable for applications with moderate tolerance. The findings highlight that laser parameter optimization is critical for cut quality, and further refinements through jigs/fixtures and the addition of a rotary axis are recommended to enhance structural accuracy and expand application versatility.
A Analysis of Tempering Treatment after Hardening on S45C steel Bogie Pin Materials in relation to Mechanical Strength Wibowo, Heri; Marwanto, Arif; Kusdiyarto, Prihatno; Prasetio, Mukhamad Andri
Journal of Engineering and Applied Technology Vol. 6 No. 02 (2025): (August)
Publisher : Faculty of Engineering, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jeatech.v6i02.90400

Abstract

S45C steel is a medium carbon steel used for railway bogie pins due to its high strength. However, this steel does not meet the minimum hardness standard for bogie pin products, requiring further processing. The specific objectives of this study are: a) to investigate the effect of tempering temperature variations on the mechanical properties of S45C steel, and b) to determine the optimal tempering temperature and time recommended for heat treatment of S45C steel. The research method applied was an experiment with hardening treatment at a temperature of 910°C for 20 minutes, followed by tempering treatment at temperatures of 175°C, 225°C, and 275°C for 20 minutes of air cooling. The testing process carried out included tensile strength testing, hardness testing, and microstructure testing. The results of this study showed that the test specimen with tempering treatment at a temperature of 175℃ was the best among the other test specimens because it was more suitable for industrial needs. This test specimen had a maximum stress value of 948.6 MPa, a maximum strain value of 7.76%, a Vickers hardness value of 358.06 VHN, and a microstructure consisting of ferrite and martensite phases, making the tempering process at a temperature of 175℃ almost close to the standards set by the company.
Slope reinforcement analysis using retaining structures: a case study in a heritage temple area in Yogyakarta Anisa Nur Amalina; Bayu Tri Jananto
Journal of Engineering and Applied Technology Vol. 7 No. 01 (2026): (March)
Publisher : Faculty of Engineering, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jeatech.v7i01.95668

Abstract

Indonesia is home to numerous cultural heritage sites situated on sloping terrain, where geotechnical stability plays a crucial role in preservation and restoration efforts. One such site is a Buddhist stupa in Sambirejo, Prambanan, Sleman, located approximately 200 meters north of Barong Temple. The stupa lies on a slope with a 16.10% gradient underlain by lithosol and regosol soils of limited thickness, which raises potential risks of instability. This study aims to evaluate the slope stability conditions of the temple area and to propose suitable reinforcement designs to ensure structural safety. Field investigations, including cone penetration tests (CPT) and hand boring, revealed that the subsurface consists primarily of fine to medium-silty sand with a groundwater table at a depth of 2.5 m. Stability analyses were performed using both manual calculations based on SNI 8460:2017 and numerical modelling with PLAXIS. Two reinforcement alternatives were assessed: cantilever retaining walls and concrete sheet piles under static and pseudo-static (seismic) conditions. The results showed that the safety factor increased by 17.9% and 12.5% for cantilever and sheet pile walls, respectively, under static loading, and by approximately 8% under dynamic conditions. These findings confirmed that both methods effectively enhance slope stability, with cantilever retaining walls demonstrating better performance in minimizing deformation than concrete sheet pile.
Quantitative standardization of sandblasting process parameters for enhanced coating adhesion in industrial applications Joko Yunianto Prihatin; Farit Ardiyanto; Slamet Pambudi
Journal of Engineering and Applied Technology Vol. 7 No. 01 (2026): (March)
Publisher : Faculty of Engineering, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Sandblasting is a critical surface preparation technique in automotive and industrial applications, yet the absence of standardized process parameters often leads to inconsistent outcomes. This study investigates the effects of air pressure, spraying distance, abrasive type, and abrasive quantity on the maximum cross-sectional area of carbon steel surfaces subjected to sandblasting. Using the Taguchi experimental design (OA L9) with four factors at three levels, nine parameter combinations were tested, each replicated three times. Non-Destructive Microscopic Testing revealed that air pressure, abrasive type, and spraying distance were the most influential factors. Optimal conditions were achieved at 2 bar pressure, 30 cm spraying distance, and the use of river or silica sand in quantities of 450–650 g, with composition No. 7 (3132) producing the largest and most uniform cross-sectional area (100 µm²). Signal-to-noise ratio analysis confirmed these findings, supporting the physical observations. The results provide a quantitative foundation for optimizing and standardizing sandblasting parameters, thereby improving coating adhesion quality and reducing variability in industrial applications. Future research will focus on fluid dynamics interpretation to refine jet velocity and particle impact efficiency, as well as exploring environmentally friendly abrasive alternatives.
Feasibility of biomass waste as feedstock for a small-scale biomass power plant in a rural area Yuli Purwanto; Anak Agung Putu Susastriawan; Suparni Setyowati Rahayu; Akanksha Mathur; Nalendra Bagaskara Kaylana; Ricko Dwi Saputro; Muhammad Banu Taslim; Sigit Prasetyo; Mutiara Damaris Panjaitan
Journal of Engineering and Applied Technology Vol. 7 No. 01 (2026): (March)
Publisher : Faculty of Engineering, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Biomass, one of many renewable energy sources, has got increasing attention nowadays, not only for heating application but also for generating electric power. Biomass based gasification power plant is a prospective energy conversion system to be applied for rural area energy sustainability. The present work aims to design and develop, and to performance evaluation of a small-scale biomass gasification power plant with capacity of 5000 watt. The plant consists of a downdraft gasifier, an impinging scrubber, a bio filter, a 5000 watt generator set, and a suction blower. In the present work, the plant is tested using feedstock of rice husk, wood scrap, and blend of rice husk-wood scrap. The gasifier temperature and tar removal by the impinging scrubber is observed and analyzed. The result shows that biomass waste of rice husk, wood scrap, and their blend have a good potential as feedstock of a biomass power plant. The biomass gasification power plant can generate electricity without any problem on the generator set. The water impinging scrubber can be used for tar reduction of the producer gas prior to be supply to the generator set.

Page 7 of 7 | Total Record : 67

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