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Journal of Engineering and Technological Sciences
Published by Institut Teknologi Bandung
ISSN : 23385502     EISSN : 23375779     DOI : 10.5614/j.eng.technol.sci
Core Subject : Engineering,
Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Electrical & Electronics Engineering
ournal of Engineering and Technological Sciences welcomes full research articles in: General Engineering Earth-Surface Processes Materials Science Environmental Science Mechanical Engineering Chemical Engineering Civil and Structural Engineering Authors are invited to submit articles that have not been published previously and are not under consideration elsewhere.
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 151 Documents
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An Integrated Sliding Mode and Lyapunov-based Control Approach for Robust Quadcopter Trajectory Tracking Al Quran, Mahdi; Al-Sheyyab , Ahmad; Rawashdeh, Mustafa; Alheyasat, Abdel rahman
Journal of Engineering and Technological Sciences Vol. 58 No. 2 (2026): Vol. 58 No. 2 (2026): April
Publisher : Directorate for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2026.58.2.8

Abstract

This paper addresses the challenges of low tracking accuracy in the attitude and position control of quadrotor unmanned aerial vehicles (UAVs). To overcome these issues, a nonlinear hybrid control strategy is proposed by combining adaptive sliding mode control with Lyapunov theory. Accounting for the nonlinearities associated with the coupling among the UAV degrees of freedom, unlike simplified control-oriented models, the proposed strategy is designed to enhance trajectory tracking performance while improving control flexibility and robustness against external disturbances. The proposed strategy expands the validity of the control-oriented model compared with the linear controllers. Moreover, the inherent robustness built into the paradigm of the sliding mode controller improves the robustness against external disturbances as well as uncaptured dynamics within the modeling process. The stability of the system is rigorously analysed using the Lyapunov stability theory, and the results confirm the stability of the proposed controller under various conditions. Extensive simulation tests are conducted to verify the effectiveness and feasibility of the control strategy. The simulation results demonstrate that the proposed method significantly improves tracking accuracy in both attitude and position control, providing a robust and reliable solution for quadrotor UAVs. This hybrid approach ensures precise trajectory tracking while maintaining stability, making it a promising technique for advanced UAV applications.
Performance of Geopolymer Concrete Deep Beams with Variation in Shear Reinforcement Ratio Rifkah, Rifkah; Saloma, Saloma; Nurjannah, Siti Aisyah; Saggaff, Anis
Journal of Engineering and Technological Sciences Vol. 58 No. 1 (2026): Vol. 58 No. 1(2026): February
Publisher : Directorate for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2026.58.1.8

Abstract

The construction industry's demand for sustainable alternatives to Portland cement has prompted investigation into geopolymer concrete (GC) as a replacement for normal concrete (NC) in deep beam applications, where structural behavior with varying shear reinforcement ratios remains insufficiently understood. This study examines the structural performance of GC and NC deep beams under monotonic loading through experimental testing and numerical modeling of six specimens—three NC (NC1, NC2, NC3) and three GC (G1, G2, G3)—with shear reinforcement ratios of 0.157%, 0.314%, and 0.628%, using LVDT sensors for displacement measurement and finite element analysis for stress–displacement validation. Results show that GC beams achieved higher maximum loads (700–1038 kN) than NC beams (500–742 kN), supported by superior compressive strength (68.36 MPa vs 43.6 MPa), greater energy dissipation (2897.54–7212.62 kN·mm vs 1340.96–2513.86 kN·mm), and improved shear capacity (ratio 0.74 vs 0.66). Ductility ratios ranged from 3.07–4.65 for NC and 1.62–2.10 for GC specimens. The enhanced performance of GC is attributed to its higher material strength, both materials exhibited similar stress distributions aligned with the strut-and-tie model and compression-controlled failure via diagonal strut formation between the loading points and supports. This study concludes GC offers strong potential as sustainable deep-beam material, achieving 40–48% higher maximum loads while maintaining comparable deflection behavior, with optimal performance at a shear reinforcement ratio of 0.628%. Experimental numerical differences remained below 1.5%. Future work should address long-term durability under cyclic loading and optimization of bond performance between GC and reinforcement materials.
New Insights into Active Faulting in Sulawesi, Indonesia Patria, Adi; Titu-Eki, Adept; Daryono, Mudrik Rahmawan
Journal of Engineering and Technological Sciences Vol. 58 No. 1 (2026): Vol. 58 No. 1(2026): February
Publisher : Directorate for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2026.58.1.9

Abstract

This study investigates the active tectonics of Sulawesi, Indonesia, a seismically active region at the convergence of the Pacific, Australian, and Eurasian plates. We analyze the geological influence on faulting styles and kinematics across the island by integrating geological, geodetic, and geophysical data. Our analysis, which includes geomorphic interpretations, reevaluation of GPS velocities, and earthquake catalogs, reveals diverse deformation regimes in Sulawesi. The North Arm exhibits thrust faulting associated with the subduction zone and normal faulting due to extensional deformation on the overriding plate. The East Arm is dominated by strike-slip faulting along the Balantak fault. Central Sulawesi exhibits prominent seismic activity along the Palu-Koro and Matano faults. West Sulawesi is characterized by a combination of thrust and strike-slip faulting. Lithotectonic units on each arm of Sulawesi are closely related to crustal thickness. The volcanic and   plutonic province on the North and West Arms has a thicker crust, while the metamorphic and ophiolite belts in central Sulawesi, and the East and Southeast Arms have thinner crust. Some major faults form boundaries between lithotectonic units, and the transitions between the major strike-slip faults coincide with lithotectonic changes, suggesting a geological influence on the distribution of faults. The North Arm exhibits extension related to subduction rollback, evidenced by normal faulting and divergence motion. Central Sulawesi shows a transition from contraction in the north of the Matano fault, accommodated by thrust faults, to extension east of the Palu-Koro fault. The Southeast Arm is also dominated by strike-slip along the Kolaka fault.
Investigating the Impact of GGBS and FA as Partial Replacements and PVA Addition on Mechanical Properties of Cement Mortar Flayyih, Ali; Owaid, Khalid
Journal of Engineering and Technological Sciences Vol. 58 No. 1 (2026): Vol. 58 No. 1(2026): February
Publisher : Directorate for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2026.58.1.10

Abstract

This study investigated the effects of partial cement replacement with Fly Ash (FA) and Ground Granulated Blast-furnace Slag (GGBS), as well as the addition of Polyvinyl Alcohol (PVA), on the mechanical and hardness properties of mortars. Mortar mixes were prepared with 15-30% FA (F-series), 15-30% GGBS (G-series), and varying PVA additions (P-series), and compared against a reference mix (Ref). Compressive, tensile, and flexural strengths at 28 days, along with Shore D hardness, were evaluated. Results indicated that both FA and GGBS improved 28-day compressive strength over the reference (Ref: 27.43 MPa), with optimal replacements at 20% FA (F20: 30.02 MPa) and 25% GGBS (G25: 34.12 MPa). GGBS mixes generally outperformed FA mixes across all tested properties, attributed to GGBS's higher calcium content promoting faster hydration and denser C-S-H gel formation. The addition of PVA further enhanced mechanical performance, with the P1 mix achieving the highest compressive (36.76 MPa), tensile (2.76 MPa), and flexural (5.43 MPa) strengths, likely due to PVA's film-forming and crack-bridging capabilities. However, excessive PVA addition showed diminishing returns. All modified mortars exhibited increased hardness compared to the reference, with GGBS (G30: 94.11) and PVA (P1: 93.73) mixes showing peak values. The findings highlight the effectiveness of GGBS as a supplementary cementitious material and demonstrate the significant potential of PVA modification for enhancing mortar strength characteristics, although optimal dosages are crucial.
Flash Emissions from Acrylonitrile Storage Tank and Their Impact on Ambient Air Quality Mapraditkul, Pornpavit; Jookjantra, Peemapat; Charuchitsopon, Pavaris; Premrungchet, Korn; Sooktawee, Sirapong; Thepanondh, Sarawut
Journal of Engineering and Technological Sciences Vol. 58 No. 2 (2026): Vol. 58 No. 2 (2026): April
Publisher : Directorate for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2026.58.2.9

Abstract

Flash emissions from chemical storage tanks are a major source of volatile organic compounds (VOCs), accounting for over 90% of total VOC releases during storage. This study evaluated acrylonitrile emissions at a petrochemical facility using the Vasquez-Beggs Equation (VBE), TANKS 5.1, and the AERMOD dispersion model. Under midrange conditions, flashing losses were estimated at 12.84 g/s, with peak emissions reaching 18.17 g/s under high-pressure, low-temperature conditions. In comparison, breathing and working losses contributed only 0.0986 g/s and 0.2776 g/s, respectively, in uncontrolled scenarios. Air dispersion modeling indicated acrylonitrile concentrations exceeding 800 µg/m³ for 24-hour exposure and surpassing 250 µg/m³ in annual averages near sensitive receptors under uncontrolled conditions. Implementing a 90% efficient emission control system reduced flashing losses to 1.284 g/s, effectively lowering ambient concentrations by more than 80%. However, even with substantial reductions, residual cancer risks at certain receptors remained above the acceptable threshold of 1.0 × 10⁻⁶, highlighting the need for additional mitigation measures. These findings underscore the importance of advanced emission control technologies and optimized operational practices to minimize the environmental and health impacts of acrylonitrile storage tanks, offering actionable insights for sustainable industrial air quality management.
Power Loss Reduction and Voltage Improvement by Relocation of Distribution Transformers: A Comprehensive Case Study Sadiq, Emad Hussen; Antar, Rakan Khalil
Journal of Engineering and Technological Sciences Vol. 58 No. 2 (2026): Vol. 58 No. 2 (2026): April
Publisher : Directorate for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2026.58.2.10

Abstract

Due to the rapid growth and expansion of the electricity industry, power systems worldwide are facing significant challenges that demand immediate attention to manage the increasing load. Many power system operators are struggling with insufficient power generation capacity. To mitigate the effects of limited power availability, reducing power losses and improving voltage profiles have become essential components of modern energy management. One effective approach to achieving these objectives in distribution networks is optimizing the placement of distribution transformers. In this study, the Electrical Transient Analyzer Program (ETAP) software is employed to evaluate selected transformer locations with respect to both power loss reduction and voltage drop performance. The findings indicate a significant reduction in power losses accompanied by a notable enhancement in the voltage profile.
Influence of Heat and Mechanical Treatments on the Mechanical and Structural Characteristics of Molded Manganese Steels Ben Lenda, Omar; El Ganich, Hajar; Benmaziane, Sara; Saad, Elmadani
Journal of Engineering and Technological Sciences Vol. 58 No. 3 (2026): Vol. 58 No. 3(2026): June (In Progress)
Publisher : Directorate for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2026.58.3.1

Abstract

This paper presents a study to improve the performance of Fe-Mn-C cast steels containing 1.7% and 2.7% Cr by weight, using two treatment methods (thermal and mechanical) applied separately to two different steel grades. This approach enables an extended service life for components such as crusher liners, mill hammers, and level crossings, without requiring complete recasting. The experimental techniques used for characterization included spark optical emission spectroscopy, optical microscopy, scanning electron microscopy, as well as micro- and macro-hardness testing. Steel 1, with a composition of 15.51% Mn, 2.68% Cr, and 1.29% C, was heat-treated at 1070 °C and quenched in water, using different holding times and thicknesses. It was found that increasing the holding time from 30 to 50 minutes and reducing the thickness from 150 to 100 millimeters led to a complete and homogeneous dissolution of carbides. As a result, Steel 1 exhibited increased ductility. Steel 2 contains 13.45% Mn, 1.72% Cr, and 1.21% C. It underwent manual mechanical treatment, which resulted in surface hardening due to the transformation of austenite into martensite.
Polyoxometalates as Catalysts for Biomass Conversion: Properties, Applications, and Regenerability Winoto, Haryo P.; Anggaswara, Rezky O.; Wahyudi, Dian H.; Mukti, Rino R.; Suendo, Veinardi; Ismunandar, Ismunandar
Journal of Engineering and Technological Sciences Vol. 58 No. 3 (2026): Vol. 58 No. 3(2026): June (In Progress)
Publisher : Directorate for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2026.58.3.2

Abstract

Polyoxometalates (POMs) have emerged as exceptionally versatile catalysts for green chemical reactions, demonstrating significant potential in the sustainable valorization of biomass. Their tunable Brønsted/Lewis acidity and redox properties enable a broad range of chemical transformations, offering remarkable flexibility in process design. This mini review provides a summary of recent advances in the thermocatalytic conversion of biomass using POMs, addressing their utilization as both homogeneous and heterogeneous catalysts. Key reaction pathways, including solvolysis, oxidation, esterification, and condensation, are highlighted as fundamental processes in biomass valorization. A central focus is placed on the crucial challenge of catalyst regenerability and stability, examining strategies to ensure the long-term viability and economic feasibility of these systems while facing the apparent low-temperature stability challenge of POMs. Finally, this review synthesizes current regeneration methods and presents a forward-looking perspective on the future challenges and opportunities in the field of biomass conversion catalyzed by polyoxometalates.
Design and Development of a Water Flow Monitoring Device using Mitsubishi FX3U-14MT PLC Frianto, Herri Trisna; Humaidi, Syahrul; Tarigan, Kerista; Ramdan, Dadan; Bonardo, Doli; Amri, Fauzan
Journal of Engineering and Technological Sciences Vol. 58 No. 3 (2026): Vol. 58 No. 3(2026): June (In Progress)
Publisher : Directorate for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2026.58.3.3

Abstract

Efficient water management is essential for ensuring sustainability and reducing operational costs, especially in small to medium-scale buildings such as schools, health clinics, and office facilities. This paper presents the design and implementation of a cost-effective automated water flow monitoring system, integrating a Mitsubishi FX3U-14MT PLC with an Arduino module to facilitate real-time flow measurement and precise control of solenoid valves. The PLC is programmed using ladder logic, while the Arduino is responsible for processing sensor data, thereby enhancing measurement accuracy and contributing to overall system flexibility. In contrast to conventional industrial automation solutions, this system is specifically designed for small-scale applications, offering an effective balance of affordability, simplicity, and reliability. Experimental testing demonstrates that the system achieves high measurement accuracy, operational stability over extended use, and optimized energy efficiency, ensuring long-term reliability in water flow management. Additionally, the system’s modular design enables straightforward adaptation to various facility sizes and plumbing configurations. These findings validate the proposed system as an accessible yet effective automation solution, particularly suitable for environments where implementing large-scale industrial control systems may be impractical. Future research could focus on incorporating adaptive control algorithms and enhancing sensor integration to further improve system performance and flexibility.
Optimizing Evaporator Design in ORC Systems for Waste-to-Energy Conversion Using FAST Diagram and Value Engineering Wibowo, R. Susalit Setya; Satmintareja, Satmintareja; Abdurahman, Asep Duduh; Suyatmin, Suyatmin; Darmawan, Darmawan; Gunawan, Ari; Budiarti, Kusumawati Dewi; Baddu, Nasrul; Pramono, Adhi; Faisal, Faisal; Nugroho, Cahyono; Ngudiwaluyo, Suharto; Putra, Zico Pratama
Journal of Engineering and Technological Sciences Vol. 58 No. 3 (2026): Vol. 58 No. 3(2026): June (In Progress)
Publisher : Directorate for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2026.58.3.4

Abstract

The global waste crisis necessitates innovative solutions for sustainable energy conversion. This study presents a comprehensive optimization framework for evaporator design in Organic Rankine Cycle (ORC) systems utilized in waste-to-energy conversion. This research integrates the Function Analysis System Technique (FAST) diagram with Value Engineering (VE) principles to assess the logical hierarchy and cost analysis components of system effectiveness. Evaluation of the 887 kW shell-and-tube evaporator showed tubes, baffles, and shells account for 90% of production costs and are the most thermally efficient components. Further strategic redesign under VE principles resulted in 23% cost reduction with 15% efficiency improvements, demonstrating resource expenditure without performance compromise. The proposed approach offers a foundational methodology for advancing enduring ORC system design while harnessing high waste-to-value electrical energy conversion at low expenses, fostering the circular economy.

Page 15 of 16 | Total Record : 151

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