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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 146 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.

Page 15 of 15 | Total Record : 146

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